refactor: get rid of package expressions by moving the code into package expression

Signed-off-by: Xe Iaso <me@xeiaso.net>

.github/actions/spelling/allow.txt

@@ -3,4 +3,5 @@ https
 ssh
 ubuntu
 workarounds
-rjack
+rjack
+msgbox

.github/actions/spelling/expect.txt

@@ -23,6 +23,7 @@ bitrate
 Bluesky
 blueskybot
 boi
+Bokm
 botnet
 botstopper
 BPort

.github/actions/spelling/patterns.txt

@@ -132,3 +132,7 @@ go install(?:\s+[a-z]+\.[-@\w/.]+)+
 # hit-count: 1 file-count: 1
 # microsoft
 \b(?:https?://|)(?:(?:(?:blogs|download\.visualstudio|docs|msdn2?|research)\.|)microsoft|blogs\.msdn)\.co(?:m|\.\w\w)/[-_a-zA-Z0-9()=./%]*
+
+# hit-count: 1 file-count: 1
+# data url
+\bdata:[-a-zA-Z=;:/0-9+]*,\S*

.github/workflows/smoke-tests.yml

@@ -18,7 +18,9 @@ jobs:
           - git-push
           - healthcheck
           - i18n
-    runs-on: ubuntu-24.04
+          - palemoon/amd64
+          #- palemoon/i386
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -43,3 +45,14 @@ jobs:
         run: |
           cd test/${{ matrix.test }}
           backoff-retry --try-count 10 ./test.sh
+
+      - name: Sanitize artifact name
+        if: always()
+        run: echo "ARTIFACT_NAME=${{ matrix.test }}" | sed 's|/|-|g' >> $GITHUB_ENV
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02
+        if: always()
+        with:
+          name: ${{ env.ARTIFACT_NAME }}
+          path: test/${{ matrix.test }}/var

VERSION

@@ -1 +1 @@
-1.21.0
+1.21.3

cmd/anubis/main.go

@@ -30,10 +30,11 @@ import (
 	"github.com/TecharoHQ/anubis"
 	"github.com/TecharoHQ/anubis/data"
 	"github.com/TecharoHQ/anubis/internal"
-	"github.com/TecharoHQ/anubis/internal/thoth"
 	libanubis "github.com/TecharoHQ/anubis/lib"
+	"github.com/TecharoHQ/anubis/lib/checker/headerexists"
 	botPolicy "github.com/TecharoHQ/anubis/lib/policy"
 	"github.com/TecharoHQ/anubis/lib/policy/config"
+	"github.com/TecharoHQ/anubis/lib/thoth"
 	"github.com/TecharoHQ/anubis/web"
 	"github.com/facebookgo/flagenv"
 	_ "github.com/joho/godotenv/autoload"
@@ -323,7 +324,7 @@ func main() {
 	if *debugBenchmarkJS {
 		policy.Bots = []botPolicy.Bot{{
 			Name:   "",
-			Rules:  botPolicy.NewHeaderExistsChecker("User-Agent"),
+			Rules:  headerexists.New("User-Agent"),
 			Action: config.RuleBenchmark,
 		}}
 	}

cmd/robots2policy/main.go

@@ -12,6 +12,7 @@ import (
 	"regexp"
 	"strings"
 
+	"github.com/TecharoHQ/anubis/lib/checker/expression"
 	"github.com/TecharoHQ/anubis/lib/policy/config"
 
 	"sigs.k8s.io/yaml"
@@ -37,11 +38,11 @@ type RobotsRule struct {
 }
 
 type AnubisRule struct {
-	Expression *config.ExpressionOrList `yaml:"expression,omitempty" json:"expression,omitempty"`
-	Challenge  *config.ChallengeRules   `yaml:"challenge,omitempty" json:"challenge,omitempty"`
-	Weight     *config.Weight           `yaml:"weight,omitempty" json:"weight,omitempty"`
-	Name       string                   `yaml:"name" json:"name"`
-	Action     string                   `yaml:"action" json:"action"`
+	Expression *expression.Config     `yaml:"expression,omitempty" json:"expression,omitempty"`
+	Challenge  *config.ChallengeRules `yaml:"challenge,omitempty" json:"challenge,omitempty"`
+	Weight     *config.Weight         `yaml:"weight,omitempty" json:"weight,omitempty"`
+	Name       string                 `yaml:"name" json:"name"`
+	Action     string                 `yaml:"action" json:"action"`
 }
 
 func init() {
@@ -224,11 +225,11 @@ func convertToAnubisRules(robotsRules []RobotsRule) []AnubisRule {
 			}
 
 			if userAgent == "*" {
-				rule.Expression = &config.ExpressionOrList{
+				rule.Expression = &expression.Config{
 					All: []string{"true"}, // Always applies
 				}
 			} else {
-				rule.Expression = &config.ExpressionOrList{
+				rule.Expression = &expression.Config{
 					All: []string{fmt.Sprintf("userAgent.contains(%q)", userAgent)},
 				}
 			}
@@ -249,11 +250,11 @@ func convertToAnubisRules(robotsRules []RobotsRule) []AnubisRule {
 				rule.Name = fmt.Sprintf("%s-global-restriction-%d", *policyName, ruleCounter)
 				rule.Action = "WEIGH"
 				rule.Weight = &config.Weight{Adjust: 20} // Increase difficulty significantly
-				rule.Expression = &config.ExpressionOrList{
+				rule.Expression = &expression.Config{
 					All: []string{"true"}, // Always applies
 				}
 			} else {
-				rule.Expression = &config.ExpressionOrList{
+				rule.Expression = &expression.Config{
 					All: []string{fmt.Sprintf("userAgent.contains(%q)", userAgent)},
 				}
 			}
@@ -285,7 +286,7 @@ func convertToAnubisRules(robotsRules []RobotsRule) []AnubisRule {
 			pathCondition := buildPathCondition(disallow)
 			conditions = append(conditions, pathCondition)
 
-			rule.Expression = &config.ExpressionOrList{
+			rule.Expression = &expression.Config{
 				All: conditions,
 			}
 

docs/blog/2025-07-22-release-1.21.1/index.mdx

@@ -43,7 +43,7 @@ And this release also fixes the following bugs:
 - In certain cases, a user could be stuck with a test cookie that is invalid, locking them out of the service for up to half an hour. This has been fixed with better validation of this case and clearing the cookie.
 - "Proof of work" has been removed from the branding due to some users having extremely negative connotations with it.
 
-We try to introduce breaking changes as much as possible, but these are the changes that may be relevant for you as an administrator:
+We try to avoid introducing breaking changes as much as possible, but these are the changes that may be relevant for you as an administrator:
 
 - The [challenge format](#challenge-format-change) has been changed in order to account for [the new challenge issuance flow](#challenge-flow-v2).
 - The [systemd service `RuntimeDirectory` has been changed](#breaking-change-systemd-runtimedirectory-change).

docs/docs/CHANGELOG.md

@@ -13,19 +13,45 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- This changes the project to: -->
 
+- The [Thoth client](https://anubis.techaro.lol/docs/admin/thoth) is now public in the repo instead of being an internal package.
+
+## v1.21.3: Minfilia Warde - Echo 3
+
+### Fixes
+
+#### Fixes a problem with nonstandard URLs and redirects
+
+Fixes [GHSA-jhjj-2g64-px7c](https://github.com/TecharoHQ/anubis/security/advisories/GHSA-jhjj-2g64-px7c).
+
+This could allow an attacker to craft an Anubis pass-challenge URL that forces a redirect to nonstandard URLs, such as the `javascript:` scheme which executes arbitrary JavaScript code in a browser context when the user clicks the "Try again" button.
+
+This has been fixed by disallowing any URLs without the scheme `http` or `https`.
+
+Additionally, the "Try again" button has been fixed to completely ignore the user-supplied redirect location. It now redirects to the home page (`/`).
+
+## v1.21.2: Minfilia Warde - Echo 2
+
+This contained an incomplete fix for [GHSA-jhjj-2g64-px7c](https://github.com/TecharoHQ/anubis/security/advisories/GHSA-jhjj-2g64-px7c). Do not use this version.
+
+## v1.21.1: Minfilia Warde - Echo 1
+
 - Expired records are now properly removed from bbolt databases ([#848](https://github.com/TecharoHQ/anubis/pull/848)).
 - Fix hanging on service restart ([#853](https://github.com/TecharoHQ/anubis/issues/853))
 
 ### Added
 
+Anubis now supports the [`missingHeader`](./admin/configuration/expressions.mdx#missingHeader) to assert the absence of headers in requests.
+
+#### New locales
+
 Anubis now supports these new languages:
 
 - [Czech](https://github.com/TecharoHQ/anubis/pull/849)
 - [Finnish](https://github.com/TecharoHQ/anubis/pull/863)
+- [Norwegian Bokmål](https://github.com/TecharoHQ/anubis/pull/855)
+- [Norwegian Nynorsk](https://github.com/TecharoHQ/anubis/pull/855)
 - [Russian](https://github.com/TecharoHQ/anubis/pull/882)
 
-Anubis now supports the [`missingHeader`](./admin/configuration/expressions.mdx#missingHeader) to assert the absence of headers in requests.
-
 ### Fixes
 
 #### Fix ["error: can't get challenge"](https://github.com/TecharoHQ/anubis/issues/869) when details about a challenge can't be found in the server side state

docs/docs/admin/environments/nginx.mdx

@@ -79,6 +79,10 @@ server {
   root "/srv/http/anubistest.techaro.lol";
   index index.html;
 
+  # Get the visiting IP from the TLS termination server
+  set_real_ip_from unix:;
+  real_ip_header   X-Real-IP;
+  
   # Your normal configuration can go here
   # location .php { fastcgi...} etc.
 }

docs/package-lock.json

@@ -5908,9 +5908,9 @@
       }
     },
     "node_modules/brace-expansion": {
-      "version": "1.1.11",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "version": "1.1.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
+      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
       "license": "MIT",
       "dependencies": {
         "balanced-match": "^1.0.0",
@@ -6496,16 +6496,16 @@
       }
     },
     "node_modules/compression": {
-      "version": "1.8.0",
-      "resolved": "https://registry.npmjs.org/compression/-/compression-1.8.0.tgz",
-      "integrity": "sha512-k6WLKfunuqCYD3t6AsuPGvQWaKwuLLh2/xHNcX4qE+vIfDNXpSqnrhwA7O53R7WVQUnt8dVAIW+YHr7xTgOgGA==",
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/compression/-/compression-1.8.1.tgz",
+      "integrity": "sha512-9mAqGPHLakhCLeNyxPkK4xVo746zQ/czLH1Ky+vkitMnWfWZps8r0qXuwhwizagCRttsL4lfG4pIOvaWLpAP0w==",
       "license": "MIT",
       "dependencies": {
         "bytes": "3.1.2",
         "compressible": "~2.0.18",
         "debug": "2.6.9",
         "negotiator": "~0.6.4",
-        "on-headers": "~1.0.2",
+        "on-headers": "~1.1.0",
         "safe-buffer": "5.2.1",
         "vary": "~1.1.2"
       },
@@ -13562,9 +13562,9 @@
       }
     },
     "node_modules/on-headers": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/on-headers/-/on-headers-1.0.2.tgz",
-      "integrity": "sha512-pZAE+FJLoyITytdqK0U5s+FIpjN0JP3OzFi/u8Rx+EV5/W+JTWGXG8xFzevE7AjBfDqHv/8vL8qQsIhHnqRkrA==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/on-headers/-/on-headers-1.1.0.tgz",
+      "integrity": "sha512-737ZY3yNnXy37FHkQxPzt4UZ2UWPWiCZWLvFZ4fu5cueciegX0zGPnrlY6bwRg4FdQOe9YU8MkmJwGhoMybl8A==",
       "license": "MIT",
       "engines": {
         "node": ">= 0.8"

errors.go

@@ -0,0 +1,7 @@
+package anubis
+
+import "errors"
+
+var (
+	ErrMisconfiguration = errors.New("[unexpected] policy: administrator misconfiguration")
+)

lib/anubis.go

@@ -28,15 +28,17 @@ import (
 	"github.com/TecharoHQ/anubis/internal/dnsbl"
 	"github.com/TecharoHQ/anubis/internal/ogtags"
 	"github.com/TecharoHQ/anubis/lib/challenge"
+	"github.com/TecharoHQ/anubis/lib/checker"
 	"github.com/TecharoHQ/anubis/lib/localization"
 	"github.com/TecharoHQ/anubis/lib/policy"
-	"github.com/TecharoHQ/anubis/lib/policy/checker"
 	"github.com/TecharoHQ/anubis/lib/policy/config"
 	"github.com/TecharoHQ/anubis/lib/store"
 
+	// checker implementations
+	_ "github.com/TecharoHQ/anubis/lib/checker/all"
+
 	// challenge implementations
-	_ "github.com/TecharoHQ/anubis/lib/challenge/metarefresh"
-	_ "github.com/TecharoHQ/anubis/lib/challenge/proofofwork"
+	_ "github.com/TecharoHQ/anubis/lib/challenge/all"
 )
 
 var (
@@ -384,6 +386,23 @@ func (s *Server) PassChallenge(w http.ResponseWriter, r *http.Request) {
 	lg := internal.GetRequestLogger(r)
 	localizer := localization.GetLocalizer(r)
 
+	redir := r.FormValue("redir")
+	redirURL, err := url.ParseRequestURI(redir)
+	if err != nil {
+		lg.Error("invalid redirect", "err", err)
+		s.respondWithStatus(w, r, localizer.T("invalid_redirect"), http.StatusBadRequest)
+		return
+	}
+
+	switch redirURL.Scheme {
+	case "", "http", "https":
+		// allowed
+	default:
+		lg.Error("XSS attempt blocked, invalid redirect scheme", "scheme", redirURL.Scheme)
+		s.respondWithStatus(w, r, localizer.T("invalid_redirect"), http.StatusBadRequest)
+		return
+	}
+
 	// Adjust cookie path if base prefix is not empty
 	cookiePath := "/"
 	if anubis.BasePrefix != "" {
@@ -398,13 +417,6 @@ func (s *Server) PassChallenge(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	redir := r.FormValue("redir")
-	redirURL, err := url.ParseRequestURI(redir)
-	if err != nil {
-		lg.Error("invalid redirect", "err", err)
-		s.respondWithError(w, r, localizer.T("invalid_redirect"))
-		return
-	}
 	// used by the path checker rule
 	r.URL = redirURL
 
@@ -539,7 +551,7 @@ func (s *Server) check(r *http.Request) (policy.CheckResult, *policy.Bot, error)
 		if matches {
 			return cr("threshold/"+t.Name, t.Action, weight), &policy.Bot{
 				Challenge: t.Challenge,
-				Rules:     &checker.List{},
+				Rules:     &checker.Any{},
 			}, nil
 		}
 	}
@@ -550,6 +562,6 @@ func (s *Server) check(r *http.Request) (policy.CheckResult, *policy.Bot, error)
 			ReportAs:   s.policy.DefaultDifficulty,
 			Algorithm:  config.DefaultAlgorithm,
 		},
-		Rules: &checker.List{},
+		Rules: &checker.Any{},
 	}, nil
 }

lib/anubis_test.go

@@ -1,6 +1,7 @@
 package lib
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -16,9 +17,9 @@ import (
 	"github.com/TecharoHQ/anubis"
 	"github.com/TecharoHQ/anubis/data"
 	"github.com/TecharoHQ/anubis/internal"
-	"github.com/TecharoHQ/anubis/internal/thoth/thothmock"
 	"github.com/TecharoHQ/anubis/lib/policy"
 	"github.com/TecharoHQ/anubis/lib/policy/config"
+	"github.com/TecharoHQ/anubis/lib/thoth/thothmock"
 )
 
 func init() {
@@ -801,3 +802,166 @@ func TestChallengeFor_ErrNotFound(t *testing.T) {
 		}
 	})
 }
+
+func TestPassChallengeXSS(t *testing.T) {
+	pol := loadPolicies(t, "", anubis.DefaultDifficulty)
+
+	srv := spawnAnubis(t, Options{
+		Next:   http.NewServeMux(),
+		Policy: pol,
+	})
+
+	ts := httptest.NewServer(internal.RemoteXRealIP(true, "tcp", srv))
+	defer ts.Close()
+
+	cli := httpClient(t)
+	chall := makeChallenge(t, ts, cli)
+
+	testCases := []struct {
+		name  string
+		redir string
+	}{
+		{
+			name:  "javascript alert",
+			redir: "javascript:alert('xss')",
+		},
+		{
+			name:  "vbscript",
+			redir: "vbscript:msgbox(\"XSS\")",
+		},
+		{
+			name:  "data url",
+			redir: "data:text/html;base64,PHNjcmlwdD5hbGVydCgneHNzJyk8L3NjcmlwdD4=",
+		},
+	}
+
+	t.Run("with test cookie", func(t *testing.T) {
+		for _, tc := range testCases {
+			t.Run(tc.name, func(t *testing.T) {
+				nonce := 0
+				elapsedTime := 420
+				calculated := ""
+				calcString := fmt.Sprintf("%s%d", chall.Challenge, nonce)
+				calculated = internal.SHA256sum(calcString)
+
+				req, err := http.NewRequest(http.MethodGet, ts.URL+"/.within.website/x/cmd/anubis/api/pass-challenge", nil)
+				if err != nil {
+					t.Fatalf("can't make request: %v", err)
+				}
+
+				q := req.URL.Query()
+				q.Set("response", calculated)
+				q.Set("nonce", fmt.Sprint(nonce))
+				q.Set("redir", tc.redir)
+				q.Set("elapsedTime", fmt.Sprint(elapsedTime))
+				req.URL.RawQuery = q.Encode()
+
+				u, err := url.Parse(ts.URL)
+				if err != nil {
+					t.Fatal(err)
+				}
+
+				for _, ckie := range cli.Jar.Cookies(u) {
+					if ckie.Name == anubis.TestCookieName {
+						req.AddCookie(ckie)
+					}
+				}
+
+				resp, err := cli.Do(req)
+				if err != nil {
+					t.Fatalf("can't do request: %v", err)
+				}
+
+				body, _ := io.ReadAll(resp.Body)
+
+				if bytes.Contains(body, []byte(tc.redir)) {
+					t.Log(string(body))
+					t.Error("found XSS in HTML body")
+				}
+
+				if resp.StatusCode != http.StatusBadRequest {
+					t.Errorf("wanted status %d, got %d. body: %s", http.StatusBadRequest, resp.StatusCode, body)
+				}
+			})
+		}
+	})
+
+	t.Run("no test cookie", func(t *testing.T) {
+		for _, tc := range testCases {
+			t.Run(tc.name, func(t *testing.T) {
+				nonce := 0
+				elapsedTime := 420
+				calculated := ""
+				calcString := fmt.Sprintf("%s%d", chall.Challenge, nonce)
+				calculated = internal.SHA256sum(calcString)
+
+				req, err := http.NewRequest(http.MethodGet, ts.URL+"/.within.website/x/cmd/anubis/api/pass-challenge", nil)
+				if err != nil {
+					t.Fatalf("can't make request: %v", err)
+				}
+
+				q := req.URL.Query()
+				q.Set("response", calculated)
+				q.Set("nonce", fmt.Sprint(nonce))
+				q.Set("redir", tc.redir)
+				q.Set("elapsedTime", fmt.Sprint(elapsedTime))
+				req.URL.RawQuery = q.Encode()
+
+				resp, err := cli.Do(req)
+				if err != nil {
+					t.Fatalf("can't do request: %v", err)
+				}
+
+				body, _ := io.ReadAll(resp.Body)
+
+				if bytes.Contains(body, []byte(tc.redir)) {
+					t.Log(string(body))
+					t.Error("found XSS in HTML body")
+				}
+
+				if resp.StatusCode != http.StatusBadRequest {
+					t.Errorf("wanted status %d, got %d. body: %s", http.StatusBadRequest, resp.StatusCode, body)
+				}
+			})
+		}
+	})
+}
+
+func TestXForwardedForNoDoubleComma(t *testing.T) {
+	var h http.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("X-Forwarded-For", r.Header.Get("X-Forwarded-For"))
+		fmt.Fprintln(w, "OK")
+	})
+
+	h = internal.XForwardedForToXRealIP(h)
+	h = internal.XForwardedForUpdate(false, h)
+
+	pol := loadPolicies(t, "testdata/permissive.yaml", 4)
+
+	srv := spawnAnubis(t, Options{
+		Next:   h,
+		Policy: pol,
+	})
+	ts := httptest.NewServer(srv)
+	t.Cleanup(ts.Close)
+
+	req, err := http.NewRequest(http.MethodGet, ts.URL, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	req.Header.Set("X-Real-Ip", "10.0.0.1")
+
+	resp, err := ts.Client().Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("response status is wrong, wanted %d but got: %s", http.StatusOK, resp.Status)
+	}
+
+	if xff := resp.Header.Get("X-Forwarded-For"); strings.HasPrefix(xff, ",,") {
+		t.Errorf("X-Forwarded-For has two leading commas: %q", xff)
+	}
+}

lib/challenge/all/all.go

@@ -0,0 +1,6 @@
+package all
+
+import (
+	_ "github.com/TecharoHQ/anubis/lib/challenge/metarefresh"
+	_ "github.com/TecharoHQ/anubis/lib/challenge/proofofwork"
+)

lib/checker/all.go

@@ -0,0 +1,35 @@
+package checker
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/TecharoHQ/anubis/internal"
+)
+
+type All []Interface
+
+func (a All) Check(r *http.Request) (bool, error) {
+	for _, c := range a {
+		match, err := c.Check(r)
+		if err != nil {
+			return match, err
+		}
+		if !match {
+			return false, err // no match
+		}
+	}
+
+	return true, nil // match
+}
+
+func (a All) Hash() string {
+	var sb strings.Builder
+
+	for _, c := range a {
+		fmt.Fprintln(&sb, c.Hash())
+	}
+
+	return internal.FastHash(sb.String())
+}

lib/checker/all/all.go

@@ -0,0 +1,10 @@
+// Package all imports all of the standard checker types.
+package all
+
+import (
+	_ "github.com/TecharoHQ/anubis/lib/checker/expression"
+	_ "github.com/TecharoHQ/anubis/lib/checker/headerexists"
+	_ "github.com/TecharoHQ/anubis/lib/checker/headermatches"
+	_ "github.com/TecharoHQ/anubis/lib/checker/path"
+	_ "github.com/TecharoHQ/anubis/lib/checker/remoteaddress"
+)

lib/checker/all_test.go

@@ -0,0 +1,70 @@
+package checker
+
+import (
+	"net/http"
+	"testing"
+)
+
+func TestAll_Check(t *testing.T) {
+	tests := []struct {
+		name     string
+		checkers []MockChecker
+		want     bool
+		wantErr  bool
+	}{
+		{
+			name: "All match",
+			checkers: []MockChecker{
+				{Result: true, Err: nil},
+				{Result: true, Err: nil},
+			},
+			want:    true,
+			wantErr: false,
+		},
+		{
+			name: "One not match",
+			checkers: []MockChecker{
+				{Result: true, Err: nil},
+				{Result: false, Err: nil},
+			},
+			want:    false,
+			wantErr: false,
+		},
+		{
+			name: "No match",
+			checkers: []MockChecker{
+				{Result: false, Err: nil},
+				{Result: false, Err: nil},
+			},
+			want:    false,
+			wantErr: false,
+		},
+		{
+			name: "Error encountered",
+			checkers: []MockChecker{
+				{Result: true, Err: nil},
+				{Result: false, Err: http.ErrNotSupported},
+			},
+			want:    false,
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var all All
+			for _, mc := range tt.checkers {
+				all = append(all, mc)
+			}
+
+			got, err := all.Check(nil)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("All.Check() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("All.Check() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

lib/checker/any.go

@@ -0,0 +1,35 @@
+package checker
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/TecharoHQ/anubis/internal"
+)
+
+type Any []Interface
+
+func (a Any) Check(r *http.Request) (bool, error) {
+	for _, c := range a {
+		match, err := c.Check(r)
+		if err != nil {
+			return match, err
+		}
+		if match {
+			return true, err // match
+		}
+	}
+
+	return false, nil // no match
+}
+
+func (a Any) Hash() string {
+	var sb strings.Builder
+
+	for _, c := range a {
+		fmt.Fprintln(&sb, c.Hash())
+	}
+
+	return internal.FastHash(sb.String())
+}

lib/checker/any_test.go

@@ -0,0 +1,83 @@
+package checker
+
+import (
+	"net/http"
+	"testing"
+)
+
+type MockChecker struct {
+	Result bool
+	Err    error
+}
+
+func (m MockChecker) Check(r *http.Request) (bool, error) {
+	return m.Result, m.Err
+}
+
+func (m MockChecker) Hash() string {
+	return "mock-hash"
+}
+
+func TestAny_Check(t *testing.T) {
+	tests := []struct {
+		name     string
+		checkers []MockChecker
+		want     bool
+		wantErr  bool
+	}{
+		{
+			name: "All match",
+			checkers: []MockChecker{
+				{Result: true, Err: nil},
+				{Result: true, Err: nil},
+			},
+			want:    true,
+			wantErr: false,
+		},
+		{
+			name: "One match",
+			checkers: []MockChecker{
+				{Result: false, Err: nil},
+				{Result: true, Err: nil},
+			},
+			want:    true,
+			wantErr: false,
+		},
+		{
+			name: "No match",
+			checkers: []MockChecker{
+				{Result: false, Err: nil},
+				{Result: false, Err: nil},
+			},
+			want:    false,
+			wantErr: false,
+		},
+		{
+			name: "Error encountered",
+			checkers: []MockChecker{
+				{Result: false, Err: nil},
+				{Result: false, Err: http.ErrNotSupported},
+			},
+			want:    false,
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var any Any
+			for _, mc := range tt.checkers {
+				any = append(any, mc)
+			}
+
+			got, err := any.Check(nil)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Any.Check() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("Any.Check() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

lib/checker/checker.go

@@ -0,0 +1,17 @@
+// Package checker defines the Checker interface and a helper utility to avoid import cycles.
+package checker
+
+import (
+	"errors"
+	"net/http"
+)
+
+var (
+	ErrUnparseableConfig = errors.New("checker: config is unparseable")
+	ErrInvalidConfig     = errors.New("checker: config is invalid")
+)
+
+type Interface interface {
+	Check(*http.Request) (matches bool, err error)
+	Hash() string
+}

lib/checker/expression/checker.go

@@ -1,43 +1,44 @@
-package policy
+package expression
 
 import (
 	"fmt"
 	"net/http"
 
 	"github.com/TecharoHQ/anubis/internal"
-	"github.com/TecharoHQ/anubis/lib/policy/config"
-	"github.com/TecharoHQ/anubis/lib/policy/expressions"
+	"github.com/TecharoHQ/anubis/lib/checker/expression/environment"
 	"github.com/google/cel-go/cel"
 	"github.com/google/cel-go/common/types"
 )
 
-type CELChecker struct {
+type Checker struct {
 	program cel.Program
 	src     string
+	hash    string
 }
 
-func NewCELChecker(cfg *config.ExpressionOrList) (*CELChecker, error) {
-	env, err := expressions.BotEnvironment()
+func New(cfg *Config) (*Checker, error) {
+	env, err := environment.Bot()
 	if err != nil {
 		return nil, err
 	}
 
-	program, err := expressions.Compile(env, cfg.String())
+	program, err := environment.Compile(env, cfg.String())
 	if err != nil {
 		return nil, fmt.Errorf("can't compile CEL program: %w", err)
 	}
 
-	return &CELChecker{
+	return &Checker{
 		src:     cfg.String(),
+		hash:    internal.FastHash(cfg.String()),
 		program: program,
 	}, nil
 }
 
-func (cc *CELChecker) Hash() string {
-	return internal.FastHash(cc.src)
+func (cc *Checker) Hash() string {
+	return cc.hash
 }
 
-func (cc *CELChecker) Check(r *http.Request) (bool, error) {
+func (cc *Checker) Check(r *http.Request) (bool, error) {
 	result, _, err := cc.program.ContextEval(r.Context(), &CELRequest{r})
 
 	if err != nil {
@@ -70,15 +71,15 @@ func (cr *CELRequest) ResolveName(name string) (any, bool) {
 	case "path":
 		return cr.URL.Path, true
 	case "query":
-		return expressions.URLValues{Values: cr.URL.Query()}, true
+		return URLValues{Values: cr.URL.Query()}, true
 	case "headers":
-		return expressions.HTTPHeaders{Header: cr.Header}, true
+		return HTTPHeaders{Header: cr.Header}, true
 	case "load_1m":
-		return expressions.Load1(), true
+		return Load1(), true
 	case "load_5m":
-		return expressions.Load5(), true
+		return Load5(), true
 	case "load_15m":
-		return expressions.Load15(), true
+		return Load15(), true
 	default:
 		return nil, false
 	}

lib/checker/expression/config.go

@@ -1,4 +1,4 @@
-package config
+package expression
 
 import (
 	"encoding/json"
@@ -9,18 +9,18 @@ import (
 )
 
 var (
-	ErrExpressionOrListMustBeStringOrObject = errors.New("config: this must be a string or an object")
-	ErrExpressionEmpty                      = errors.New("config: this expression is empty")
-	ErrExpressionCantHaveBoth               = errors.New("config: expression block can't contain multiple expression types")
+	ErrExpressionOrListMustBeStringOrObject = errors.New("expression: this must be a string or an object")
+	ErrExpressionEmpty                      = errors.New("expression: this expression is empty")
+	ErrExpressionCantHaveBoth               = errors.New("expression: expression block can't contain multiple expression types")
 )
 
-type ExpressionOrList struct {
+type Config struct {
 	Expression string   `json:"-" yaml:"-"`
 	All        []string `json:"all,omitempty" yaml:"all,omitempty"`
 	Any        []string `json:"any,omitempty" yaml:"any,omitempty"`
 }
 
-func (eol ExpressionOrList) String() string {
+func (eol Config) String() string {
 	switch {
 	case len(eol.Expression) != 0:
 		return eol.Expression
@@ -46,7 +46,7 @@ func (eol ExpressionOrList) String() string {
 	panic("this should not happen")
 }
 
-func (eol ExpressionOrList) Equal(rhs *ExpressionOrList) bool {
+func (eol Config) Equal(rhs *Config) bool {
 	if eol.Expression != rhs.Expression {
 		return false
 	}
@@ -62,7 +62,7 @@ func (eol ExpressionOrList) Equal(rhs *ExpressionOrList) bool {
 	return true
 }
 
-func (eol *ExpressionOrList) MarshalYAML() (any, error) {
+func (eol *Config) MarshalYAML() (any, error) {
 	switch {
 	case len(eol.All) == 1 && len(eol.Any) == 0:
 		eol.Expression = eol.All[0]
@@ -76,11 +76,11 @@ func (eol *ExpressionOrList) MarshalYAML() (any, error) {
 		return eol.Expression, nil
 	}
 
-	type RawExpressionOrList ExpressionOrList
+	type RawExpressionOrList Config
 	return RawExpressionOrList(*eol), nil
 }
 
-func (eol *ExpressionOrList) MarshalJSON() ([]byte, error) {
+func (eol *Config) MarshalJSON() ([]byte, error) {
 	switch {
 	case len(eol.All) == 1 && len(eol.Any) == 0:
 		eol.Expression = eol.All[0]
@@ -94,17 +94,17 @@ func (eol *ExpressionOrList) MarshalJSON() ([]byte, error) {
 		return json.Marshal(string(eol.Expression))
 	}
 
-	type RawExpressionOrList ExpressionOrList
+	type RawExpressionOrList Config
 	val := RawExpressionOrList(*eol)
 	return json.Marshal(val)
 }
 
-func (eol *ExpressionOrList) UnmarshalJSON(data []byte) error {
+func (eol *Config) UnmarshalJSON(data []byte) error {
 	switch string(data[0]) {
 	case `"`: // string
 		return json.Unmarshal(data, &eol.Expression)
 	case "{": // object
-		type RawExpressionOrList ExpressionOrList
+		type RawExpressionOrList Config
 		var val RawExpressionOrList
 		if err := json.Unmarshal(data, &val); err != nil {
 			return err
@@ -118,7 +118,7 @@ func (eol *ExpressionOrList) UnmarshalJSON(data []byte) error {
 	return ErrExpressionOrListMustBeStringOrObject
 }
 
-func (eol *ExpressionOrList) Valid() error {
+func (eol *Config) Valid() error {
 	if eol.Expression == "" && len(eol.All) == 0 && len(eol.Any) == 0 {
 		return ErrExpressionEmpty
 	}

lib/checker/expression/config_test.go

@@ -1,4 +1,4 @@
-package config
+package expression
 
 import (
 	"bytes"
@@ -12,13 +12,13 @@ import (
 func TestExpressionOrListMarshalJSON(t *testing.T) {
 	for _, tt := range []struct {
 		name   string
-		input  *ExpressionOrList
+		input  *Config
 		output []byte
 		err    error
 	}{
 		{
 			name: "single expression",
-			input: &ExpressionOrList{
+			input: &Config{
 				Expression: "true",
 			},
 			output: []byte(`"true"`),
@@ -26,7 +26,7 @@ func TestExpressionOrListMarshalJSON(t *testing.T) {
 		},
 		{
 			name: "all",
-			input: &ExpressionOrList{
+			input: &Config{
 				All: []string{"true", "true"},
 			},
 			output: []byte(`{"all":["true","true"]}`),
@@ -34,7 +34,7 @@ func TestExpressionOrListMarshalJSON(t *testing.T) {
 		},
 		{
 			name: "all one",
-			input: &ExpressionOrList{
+			input: &Config{
 				All: []string{"true"},
 			},
 			output: []byte(`"true"`),
@@ -42,7 +42,7 @@ func TestExpressionOrListMarshalJSON(t *testing.T) {
 		},
 		{
 			name: "any",
-			input: &ExpressionOrList{
+			input: &Config{
 				Any: []string{"true", "false"},
 			},
 			output: []byte(`{"any":["true","false"]}`),
@@ -50,7 +50,7 @@ func TestExpressionOrListMarshalJSON(t *testing.T) {
 		},
 		{
 			name: "any one",
-			input: &ExpressionOrList{
+			input: &Config{
 				Any: []string{"true"},
 			},
 			output: []byte(`"true"`),
@@ -75,13 +75,13 @@ func TestExpressionOrListMarshalJSON(t *testing.T) {
 func TestExpressionOrListMarshalYAML(t *testing.T) {
 	for _, tt := range []struct {
 		name   string
-		input  *ExpressionOrList
+		input  *Config
 		output []byte
 		err    error
 	}{
 		{
 			name: "single expression",
-			input: &ExpressionOrList{
+			input: &Config{
 				Expression: "true",
 			},
 			output: []byte(`"true"`),
@@ -89,7 +89,7 @@ func TestExpressionOrListMarshalYAML(t *testing.T) {
 		},
 		{
 			name: "all",
-			input: &ExpressionOrList{
+			input: &Config{
 				All: []string{"true", "true"},
 			},
 			output: []byte(`all:
@@ -99,7 +99,7 @@ func TestExpressionOrListMarshalYAML(t *testing.T) {
 		},
 		{
 			name: "all one",
-			input: &ExpressionOrList{
+			input: &Config{
 				All: []string{"true"},
 			},
 			output: []byte(`"true"`),
@@ -107,7 +107,7 @@ func TestExpressionOrListMarshalYAML(t *testing.T) {
 		},
 		{
 			name: "any",
-			input: &ExpressionOrList{
+			input: &Config{
 				Any: []string{"true", "false"},
 			},
 			output: []byte(`any:
@@ -117,7 +117,7 @@ func TestExpressionOrListMarshalYAML(t *testing.T) {
 		},
 		{
 			name: "any one",
-			input: &ExpressionOrList{
+			input: &Config{
 				Any: []string{"true"},
 			},
 			output: []byte(`"true"`),
@@ -145,14 +145,14 @@ func TestExpressionOrListUnmarshalJSON(t *testing.T) {
 	for _, tt := range []struct {
 		err      error
 		validErr error
-		result   *ExpressionOrList
+		result   *Config
 		name     string
 		inp      string
 	}{
 		{
 			name: "simple",
 			inp:  `"\"User-Agent\" in headers"`,
-			result: &ExpressionOrList{
+			result: &Config{
 				Expression: `"User-Agent" in headers`,
 			},
 		},
@@ -161,7 +161,7 @@ func TestExpressionOrListUnmarshalJSON(t *testing.T) {
 			inp: `{
 			"all": ["\"User-Agent\" in headers"]
 			}`,
-			result: &ExpressionOrList{
+			result: &Config{
 				All: []string{
 					`"User-Agent" in headers`,
 				},
@@ -172,7 +172,7 @@ func TestExpressionOrListUnmarshalJSON(t *testing.T) {
 			inp: `{
 			"any": ["\"User-Agent\" in headers"]
 			}`,
-			result: &ExpressionOrList{
+			result: &Config{
 				Any: []string{
 					`"User-Agent" in headers`,
 				},
@@ -195,7 +195,7 @@ func TestExpressionOrListUnmarshalJSON(t *testing.T) {
 		},
 	} {
 		t.Run(tt.name, func(t *testing.T) {
-			var eol ExpressionOrList
+			var eol Config
 
 			if err := json.Unmarshal([]byte(tt.inp), &eol); !errors.Is(err, tt.err) {
 				t.Errorf("wanted unmarshal error: %v but got: %v", tt.err, err)
@@ -217,40 +217,40 @@ func TestExpressionOrListUnmarshalJSON(t *testing.T) {
 func TestExpressionOrListString(t *testing.T) {
 	for _, tt := range []struct {
 		name string
-		in   ExpressionOrList
+		in   Config
 		out  string
 	}{
 		{
 			name: "single expression",
-			in: ExpressionOrList{
+			in: Config{
 				Expression: "true",
 			},
 			out: "true",
 		},
 		{
 			name: "all",
-			in: ExpressionOrList{
+			in: Config{
 				All: []string{"true"},
 			},
 			out: "( true )",
 		},
 		{
 			name: "all with &&",
-			in: ExpressionOrList{
+			in: Config{
 				All: []string{"true", "true"},
 			},
 			out: "( true ) && ( true )",
 		},
 		{
 			name: "any",
-			in: ExpressionOrList{
+			in: Config{
 				All: []string{"true"},
 			},
 			out: "( true )",
 		},
 		{
 			name: "any with ||",
-			in: ExpressionOrList{
+			in: Config{
 				Any: []string{"true", "true"},
 			},
 			out: "( true ) || ( true )",

lib/checker/expression/environment/environment.go

@@ -1,4 +1,4 @@
-package expressions
+package environment
 
 import (
 	"math/rand/v2"
@@ -10,11 +10,11 @@ import (
 	"github.com/google/cel-go/ext"
 )
 
-// BotEnvironment creates a new CEL environment, this is the set of
-// variables and functions that are passed into the CEL scope so that
-// Anubis can fail loudly and early when something is invalid instead
-// of blowing up at runtime.
-func BotEnvironment() (*cel.Env, error) {
+// Bot creates a new CEL environment, this is the set of variables and
+// functions that are passed into the CEL scope so that Anubis can fail
+// loudly and early when something is invalid instead of blowing up at
+// runtime.
+func Bot() (*cel.Env, error) {
 	return New(
 		// Variables exposed to CEL programs:
 		cel.Variable("remoteAddress", cel.StringType),
@@ -57,13 +57,14 @@ func BotEnvironment() (*cel.Env, error) {
 	)
 }
 
-// NewThreshold creates a new CEL environment for threshold checking.
-func ThresholdEnvironment() (*cel.Env, error) {
+// Threshold creates a new CEL environment for threshold checking.
+func Threshold() (*cel.Env, error) {
 	return New(
 		cel.Variable("weight", cel.IntType),
 	)
 }
 
+// New creates a new base CEL environment.
 func New(opts ...cel.EnvOption) (*cel.Env, error) {
 	args := []cel.EnvOption{
 		ext.Strings(
@@ -95,7 +96,7 @@ func New(opts ...cel.EnvOption) (*cel.Env, error) {
 	return cel.NewEnv(args...)
 }
 
-// Compile takes CEL environment and syntax tree then emits an optimized
+// Compile takes a CEL environment and syntax tree then emits an optimized
 // Program for execution.
 func Compile(env *cel.Env, src string) (cel.Program, error) {
 	intermediate, iss := env.Compile(src)

lib/checker/expression/environment/environment_test.go

@@ -1,4 +1,4 @@
-package expressions
+package environment
 
 import (
 	"testing"
@@ -6,8 +6,8 @@ import (
 	"github.com/google/cel-go/common/types"
 )
 
-func TestBotEnvironment(t *testing.T) {
-	env, err := BotEnvironment()
+func TestBot(t *testing.T) {
+	env, err := Bot()
 	if err != nil {
 		t.Fatalf("failed to create bot environment: %v", err)
 	}
@@ -108,8 +108,8 @@ func TestBotEnvironment(t *testing.T) {
 	})
 }
 
-func TestThresholdEnvironment(t *testing.T) {
-	env, err := ThresholdEnvironment()
+func TestThreshold(t *testing.T) {
+	env, err := Threshold()
 	if err != nil {
 		t.Fatalf("failed to create threshold environment: %v", err)
 	}

lib/checker/expression/factory.go

@@ -0,0 +1,43 @@
+package expression
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+func init() {
+	checker.Register("expression", Factory{})
+}
+
+type Factory struct{}
+
+func (f Factory) Build(ctx context.Context, data json.RawMessage) (checker.Interface, error) {
+	var fc = &Config{}
+
+	if err := json.Unmarshal([]byte(data), fc); err != nil {
+		return nil, errors.Join(checker.ErrUnparseableConfig, err)
+	}
+
+	if err := fc.Valid(); err != nil {
+		return nil, errors.Join(checker.ErrInvalidConfig, err)
+	}
+
+	return New(fc)
+}
+
+func (f Factory) Valid(ctx context.Context, data json.RawMessage) error {
+	var fc = &Config{}
+
+	if err := json.Unmarshal([]byte(data), fc); err != nil {
+		return err
+	}
+
+	if err := fc.Valid(); err != nil {
+		return err
+	}
+
+	return nil
+}

lib/checker/expression/http_headers.go

@@ -1,4 +1,4 @@
-package expressions
+package expression
 
 import (
 	"net/http"

lib/checker/expression/http_headers_test.go

@@ -1,4 +1,4 @@
-package expressions
+package expression
 
 import (
 	"net/http"

lib/checker/expression/loadavg.go

@@ -1,4 +1,4 @@
-package expressions
+package expression
 
 import (
 	"context"

lib/checker/expression/url_values.go

@@ -1,4 +1,4 @@
-package expressions
+package expression
 
 import (
 	"errors"

lib/checker/expression/url_values_test.go

@@ -1,4 +1,4 @@
-package expressions
+package expression
 
 import (
 	"net/url"

lib/checker/headerexists/checker.go

@@ -0,0 +1,32 @@
+package headerexists
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/TecharoHQ/anubis/internal"
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+func New(key string) checker.Interface {
+	return headerExistsChecker{
+		header: strings.TrimSpace(http.CanonicalHeaderKey(key)),
+		hash:   internal.FastHash(key),
+	}
+}
+
+type headerExistsChecker struct {
+	header, hash string
+}
+
+func (hec headerExistsChecker) Check(r *http.Request) (bool, error) {
+	if r.Header.Get(hec.header) != "" {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func (hec headerExistsChecker) Hash() string {
+	return hec.hash
+}

lib/checker/headerexists/checker_test.go

@@ -0,0 +1,57 @@
+package headerexists
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"testing"
+)
+
+func TestChecker(t *testing.T) {
+	fac := Factory{}
+
+	for _, tt := range []struct {
+		name      string
+		header    string
+		reqHeader string
+		ok        bool
+	}{
+		{
+			name:      "match",
+			header:    "Authorization",
+			reqHeader: "Authorization",
+			ok:        true,
+		},
+		{
+			name:      "not_match",
+			header:    "Authorization",
+			reqHeader: "Authentication",
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			hec, err := fac.Build(t.Context(), json.RawMessage(fmt.Sprintf("%q", tt.header)))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			t.Log(hec.Hash())
+
+			r, err := http.NewRequest(http.MethodGet, "/", nil)
+			if err != nil {
+				t.Fatalf("can't make request: %v", err)
+			}
+
+			r.Header.Set(tt.reqHeader, "hunter2")
+
+			ok, err := hec.Check(r)
+
+			if tt.ok != ok {
+				t.Errorf("ok: %v, wanted: %v", ok, tt.ok)
+			}
+
+			if err != nil {
+				t.Errorf("err: %v", err)
+			}
+		})
+	}
+}

lib/checker/headerexists/factory.go

@@ -0,0 +1,40 @@
+package headerexists
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+type Factory struct{}
+
+func (f Factory) Build(ctx context.Context, data json.RawMessage) (checker.Interface, error) {
+	var headerName string
+
+	if err := json.Unmarshal([]byte(data), &headerName); err != nil {
+		return nil, fmt.Errorf("%w: want string", checker.ErrUnparseableConfig)
+	}
+
+	if err := f.Valid(ctx, data); err != nil {
+		return nil, err
+	}
+
+	return New(http.CanonicalHeaderKey(headerName)), nil
+}
+
+func (Factory) Valid(ctx context.Context, data json.RawMessage) error {
+	var headerName string
+
+	if err := json.Unmarshal([]byte(data), &headerName); err != nil {
+		return fmt.Errorf("%w: want string", checker.ErrUnparseableConfig)
+	}
+
+	if headerName == "" {
+		return fmt.Errorf("%w: string must not be empty", checker.ErrInvalidConfig)
+	}
+
+	return nil
+}

lib/checker/headerexists/factory_test.go

@@ -0,0 +1,60 @@
+package headerexists
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFactoryGood(t *testing.T) {
+	files, err := os.ReadDir("./testdata/good")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fac := Factory{}
+
+	for _, fname := range files {
+		t.Run(fname.Name(), func(t *testing.T) {
+			data, err := os.ReadFile(filepath.Join("testdata", "good", fname.Name()))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if err := fac.Valid(t.Context(), json.RawMessage(data)); err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}
+
+func TestFactoryBad(t *testing.T) {
+	files, err := os.ReadDir("./testdata/bad")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fac := Factory{}
+
+	for _, fname := range files {
+		t.Run(fname.Name(), func(t *testing.T) {
+			data, err := os.ReadFile(filepath.Join("testdata", "bad", fname.Name()))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			t.Run("Build", func(t *testing.T) {
+				if _, err := fac.Build(t.Context(), json.RawMessage(data)); err == nil {
+					t.Fatal(err)
+				}
+			})
+
+			t.Run("Valid", func(t *testing.T) {
+				if err := fac.Valid(t.Context(), json.RawMessage(data)); err == nil {
+					t.Fatal(err)
+				}
+			})
+		})
+	}
+}

lib/checker/headerexists/testdata/bad/empty.json

@@ -0,0 +1 @@
+""

lib/checker/headerexists/testdata/bad/object.json

@@ -0,0 +1 @@
+{}

lib/checker/headerexists/testdata/good/authorization.json

@@ -0,0 +1 @@
+"Authorization"

lib/checker/headermatches/checker.go

@@ -0,0 +1,46 @@
+package headermatches
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"regexp"
+
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+type Checker struct {
+	header string
+	regexp *regexp.Regexp
+	hash   string
+}
+
+func (c *Checker) Check(r *http.Request) (bool, error) {
+	if c.regexp.MatchString(r.Header.Get(c.header)) {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func (c *Checker) Hash() string {
+	return c.hash
+}
+
+func New(key, valueRex string) (checker.Interface, error) {
+	fc := fileConfig{
+		Header:     key,
+		ValueRegex: valueRex,
+	}
+
+	if err := fc.Valid(); err != nil {
+		return nil, err
+	}
+
+	data, err := json.Marshal(fc)
+	if err != nil {
+		return nil, err
+	}
+
+	return Factory{}.Build(context.Background(), json.RawMessage(data))
+}

lib/checker/headermatches/checker_test.go

@@ -0,0 +1,98 @@
+package headermatches
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"testing"
+)
+
+func TestChecker(t *testing.T) {
+
+}
+
+func TestHeaderMatchesChecker(t *testing.T) {
+	fac := Factory{}
+
+	for _, tt := range []struct {
+		err            error
+		name           string
+		header         string
+		rexStr         string
+		reqHeaderKey   string
+		reqHeaderValue string
+		ok             bool
+	}{
+		{
+			name:           "match",
+			header:         "Cf-Worker",
+			rexStr:         ".*",
+			reqHeaderKey:   "Cf-Worker",
+			reqHeaderValue: "true",
+			ok:             true,
+			err:            nil,
+		},
+		{
+			name:           "not_match",
+			header:         "Cf-Worker",
+			rexStr:         "false",
+			reqHeaderKey:   "Cf-Worker",
+			reqHeaderValue: "true",
+			ok:             false,
+			err:            nil,
+		},
+		{
+			name:           "not_present",
+			header:         "Cf-Worker",
+			rexStr:         "foobar",
+			reqHeaderKey:   "Something-Else",
+			reqHeaderValue: "true",
+			ok:             false,
+			err:            nil,
+		},
+		{
+			name:   "invalid_regex",
+			rexStr: "a(b",
+			err:    ErrInvalidRegex,
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			fc := fileConfig{
+				Header:     tt.header,
+				ValueRegex: tt.rexStr,
+			}
+			data, err := json.Marshal(fc)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			hmc, err := fac.Build(t.Context(), json.RawMessage(data))
+			if err != nil && !errors.Is(err, tt.err) {
+				t.Fatalf("creating HeaderMatchesChecker failed")
+			}
+
+			if tt.err != nil && hmc == nil {
+				return
+			}
+
+			t.Log(hmc.Hash())
+
+			r, err := http.NewRequest(http.MethodGet, "/", nil)
+			if err != nil {
+				t.Fatalf("can't make request: %v", err)
+			}
+
+			r.Header.Set(tt.reqHeaderKey, tt.reqHeaderValue)
+
+			ok, err := hmc.Check(r)
+
+			if tt.ok != ok {
+				t.Errorf("ok: %v, wanted: %v", ok, tt.ok)
+			}
+
+			if err != nil && tt.err != nil && !errors.Is(err, tt.err) {
+				t.Errorf("err: %v, wanted: %v", err, tt.err)
+			}
+		})
+	}
+}

lib/checker/headermatches/config.go

@@ -0,0 +1,44 @@
+package headermatches
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+)
+
+var (
+	ErrNoHeader     = errors.New("headermatches: no header is configured")
+	ErrNoValueRegex = errors.New("headermatches: no value regex is configured")
+	ErrInvalidRegex = errors.New("headermatches: value regex is invalid")
+)
+
+type fileConfig struct {
+	Header     string `json:"header" yaml:"header"`
+	ValueRegex string `json:"value_regex" yaml:"value_regex"`
+}
+
+func (fc fileConfig) String() string {
+	return fmt.Sprintf("header=%q value_regex=%q", fc.Header, fc.ValueRegex)
+}
+
+func (fc fileConfig) Valid() error {
+	var errs []error
+
+	if fc.Header == "" {
+		errs = append(errs, ErrNoHeader)
+	}
+
+	if fc.ValueRegex == "" {
+		errs = append(errs, ErrNoValueRegex)
+	}
+
+	if _, err := regexp.Compile(fc.ValueRegex); err != nil {
+		errs = append(errs, ErrInvalidRegex, err)
+	}
+
+	if len(errs) != 0 {
+		return errors.Join(errs...)
+	}
+
+	return nil
+}

lib/checker/headermatches/config_test.go

@@ -0,0 +1,55 @@
+package headermatches
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestFileConfigValid(t *testing.T) {
+	for _, tt := range []struct {
+		name, description string
+		in                fileConfig
+		err               error
+	}{
+		{
+			name:        "simple happy",
+			description: "the most common usecase",
+			in: fileConfig{
+				Header:     "User-Agent",
+				ValueRegex: ".*",
+			},
+		},
+		{
+			name:        "no header",
+			description: "Header must be set, it is not",
+			in: fileConfig{
+				ValueRegex: ".*",
+			},
+			err: ErrNoHeader,
+		},
+		{
+			name:        "no value regex",
+			description: "ValueRegex must be set, it is not",
+			in: fileConfig{
+				Header: "User-Agent",
+			},
+			err: ErrNoValueRegex,
+		},
+		{
+			name:        "invalid regex",
+			description: "the user wrote an invalid value regular expression",
+			in: fileConfig{
+				Header:     "User-Agent",
+				ValueRegex: "[a-z",
+			},
+			err: ErrInvalidRegex,
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.in.Valid(); !errors.Is(err, tt.err) {
+				t.Log(tt.description)
+				t.Fatal(err)
+			}
+		})
+	}
+}

lib/checker/headermatches/factory.go

@@ -0,0 +1,66 @@
+package headermatches
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"regexp"
+
+	"github.com/TecharoHQ/anubis/internal"
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+func init() {
+	checker.Register("header_matches", Factory{})
+	checker.Register("user_agent", Factory{defaultHeader: "User-Agent"})
+}
+
+type Factory struct {
+	defaultHeader string
+}
+
+func (f Factory) Build(ctx context.Context, data json.RawMessage) (checker.Interface, error) {
+	var fc fileConfig
+
+	if f.defaultHeader != "" {
+		fc.Header = f.defaultHeader
+	}
+
+	if err := json.Unmarshal([]byte(data), &fc); err != nil {
+		return nil, errors.Join(checker.ErrUnparseableConfig, err)
+	}
+
+	if err := fc.Valid(); err != nil {
+		return nil, errors.Join(checker.ErrInvalidConfig, err)
+	}
+
+	valueRex, err := regexp.Compile(fc.ValueRegex)
+	if err != nil {
+		return nil, errors.Join(ErrInvalidRegex, err)
+	}
+
+	return &Checker{
+		header: http.CanonicalHeaderKey(fc.Header),
+		regexp: valueRex,
+		hash:   internal.FastHash(fc.String()),
+	}, nil
+}
+
+func (f Factory) Valid(ctx context.Context, data json.RawMessage) error {
+	var fc fileConfig
+
+	if f.defaultHeader != "" {
+		fc.Header = f.defaultHeader
+	}
+
+	if err := json.Unmarshal([]byte(data), &fc); err != nil {
+		return err
+	}
+
+	if err := fc.Valid(); err != nil {
+		return err
+	}
+
+	return nil
+}

lib/checker/headermatches/factory_test.go

@@ -0,0 +1,52 @@
+package headermatches
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFactoryGood(t *testing.T) {
+	files, err := os.ReadDir("./testdata/good")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fac := Factory{}
+
+	for _, fname := range files {
+		t.Run(fname.Name(), func(t *testing.T) {
+			data, err := os.ReadFile(filepath.Join("testdata", "good", fname.Name()))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if err := fac.Valid(t.Context(), json.RawMessage(data)); err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}
+
+func TestFactoryBad(t *testing.T) {
+	files, err := os.ReadDir("./testdata/bad")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fac := Factory{}
+
+	for _, fname := range files {
+		t.Run(fname.Name(), func(t *testing.T) {
+			data, err := os.ReadFile(filepath.Join("testdata", "bad", fname.Name()))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if err := fac.Valid(t.Context(), json.RawMessage(data)); err == nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}

lib/checker/headermatches/testdata/bad/invalid_config.json

@@ -0,0 +1 @@
+}

lib/checker/headermatches/testdata/bad/invalid_value_regex.json

@@ -0,0 +1,4 @@
+{
+  "header": "User-Agent",
+  "value_regex": "a(b"
+}

lib/checker/headermatches/testdata/bad/no_header.json

@@ -0,0 +1,3 @@
+{
+  "value_regex": "PaleMoon"
+}

lib/checker/headermatches/testdata/bad/no_value_regex.json

@@ -0,0 +1,3 @@
+{
+  "header": "User-Agent"
+}

lib/checker/headermatches/testdata/bad/nothing.json

@@ -0,0 +1 @@
+{}

lib/checker/headermatches/testdata/good/simple.json

@@ -0,0 +1,4 @@
+{
+  "header": "User-Agent",
+  "value_regex": "PaleMoon"
+}

lib/checker/headermatches/useragent.go

@@ -0,0 +1,35 @@
+package headermatches
+
+import (
+	"context"
+	"encoding/json"
+
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+func ValidUserAgent(valueRex string) error {
+	fc := fileConfig{
+		Header:     "User-Agent",
+		ValueRegex: valueRex,
+	}
+
+	return fc.Valid()
+}
+
+func NewUserAgent(valueRex string) (checker.Interface, error) {
+	fc := fileConfig{
+		Header:     "User-Agent",
+		ValueRegex: valueRex,
+	}
+
+	if err := fc.Valid(); err != nil {
+		return nil, err
+	}
+
+	data, err := json.Marshal(fc)
+	if err != nil {
+		return nil, err
+	}
+
+	return Factory{}.Build(context.Background(), json.RawMessage(data))
+}

lib/checker/path/checker.go

@@ -0,0 +1,37 @@
+package path
+
+import (
+	"fmt"
+	"net/http"
+	"regexp"
+	"strings"
+
+	"github.com/TecharoHQ/anubis"
+	"github.com/TecharoHQ/anubis/internal"
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+func New(rexStr string) (checker.Interface, error) {
+	rex, err := regexp.Compile(strings.TrimSpace(rexStr))
+	if err != nil {
+		return nil, fmt.Errorf("%w: regex %s failed parse: %w", anubis.ErrMisconfiguration, rexStr, err)
+	}
+	return &Checker{rex, internal.FastHash(rexStr)}, nil
+}
+
+type Checker struct {
+	regexp *regexp.Regexp
+	hash   string
+}
+
+func (c *Checker) Check(r *http.Request) (bool, error) {
+	if c.regexp.MatchString(r.URL.Path) {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func (c *Checker) Hash() string {
+	return c.hash
+}

lib/checker/path/checker_test.go

@@ -0,0 +1,90 @@
+package path
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"testing"
+)
+
+func TestChecker(t *testing.T) {
+	fac := Factory{}
+
+	for _, tt := range []struct {
+		err     error
+		name    string
+		rexStr  string
+		reqPath string
+		ok      bool
+	}{
+		{
+			name:    "match",
+			rexStr:  "^/api/.*",
+			reqPath: "/api/v1/users",
+			ok:      true,
+			err:     nil,
+		},
+		{
+			name:    "not_match",
+			rexStr:  "^/api/.*",
+			reqPath: "/static/index.html",
+			ok:      false,
+			err:     nil,
+		},
+		{
+			name:    "wildcard_match",
+			rexStr:  ".*\\.json$",
+			reqPath: "/data/config.json",
+			ok:      true,
+			err:     nil,
+		},
+		{
+			name:    "wildcard_not_match",
+			rexStr:  ".*\\.json$",
+			reqPath: "/data/config.yaml",
+			ok:      false,
+			err:     nil,
+		},
+		{
+			name:   "invalid_regex",
+			rexStr: "a(b",
+			err:    ErrInvalidRegex,
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			fc := fileConfig{
+				Regex: tt.rexStr,
+			}
+			data, err := json.Marshal(fc)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			pc, err := fac.Build(t.Context(), json.RawMessage(data))
+			if err != nil && !errors.Is(err, tt.err) {
+				t.Fatalf("creating PathChecker failed")
+			}
+
+			if tt.err != nil && pc == nil {
+				return
+			}
+
+			t.Log(pc.Hash())
+
+			r, err := http.NewRequest(http.MethodGet, tt.reqPath, nil)
+			if err != nil {
+				t.Fatalf("can't make request: %v", err)
+			}
+
+			ok, err := pc.Check(r)
+
+			if tt.ok != ok {
+				t.Errorf("ok: %v, wanted: %v", ok, tt.ok)
+			}
+
+			if err != nil && tt.err != nil && !errors.Is(err, tt.err) {
+				t.Errorf("err: %v, wanted: %v", err, tt.err)
+			}
+		})
+	}
+}

lib/checker/path/config.go

@@ -0,0 +1,38 @@
+package path
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+)
+
+var (
+	ErrNoRegex      = errors.New("path: no regex is configured")
+	ErrInvalidRegex = errors.New("path: regex is invalid")
+)
+
+type fileConfig struct {
+	Regex string `json:"regex" yaml:"regex"`
+}
+
+func (fc fileConfig) String() string {
+	return fmt.Sprintf("regex=%q", fc.Regex)
+}
+
+func (fc fileConfig) Valid() error {
+	var errs []error
+
+	if fc.Regex == "" {
+		errs = append(errs, ErrNoRegex)
+	}
+
+	if _, err := regexp.Compile(fc.Regex); err != nil {
+		errs = append(errs, ErrInvalidRegex, err)
+	}
+
+	if len(errs) != 0 {
+		return errors.Join(errs...)
+	}
+
+	return nil
+}

lib/checker/path/config_test.go

@@ -0,0 +1,50 @@
+package path
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestFileConfigValid(t *testing.T) {
+	for _, tt := range []struct {
+		name, description string
+		in                fileConfig
+		err               error
+	}{
+		{
+			name:        "simple happy",
+			description: "the most common usecase",
+			in: fileConfig{
+				Regex: "^/api/.*",
+			},
+		},
+		{
+			name:        "wildcard match",
+			description: "match files with specific extension",
+			in: fileConfig{
+				Regex: ".*[.]json$",
+			},
+		},
+		{
+			name:        "no regex",
+			description: "Regex must be set, it is not",
+			in:          fileConfig{},
+			err:         ErrNoRegex,
+		},
+		{
+			name:        "invalid regex",
+			description: "the user wrote an invalid regular expression",
+			in: fileConfig{
+				Regex: "[a-z",
+			},
+			err: ErrInvalidRegex,
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.in.Valid(); !errors.Is(err, tt.err) {
+				t.Log(tt.description)
+				t.Fatalf("got %v, wanted %v", err, tt.err)
+			}
+		})
+	}
+}

lib/checker/path/factory.go

@@ -0,0 +1,58 @@
+package path
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"regexp"
+	"strings"
+
+	"github.com/TecharoHQ/anubis/internal"
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+func init() {
+	checker.Register("path", Factory{})
+}
+
+type Factory struct{}
+
+func (f Factory) Build(ctx context.Context, data json.RawMessage) (checker.Interface, error) {
+	var fc fileConfig
+
+	if err := json.Unmarshal([]byte(data), &fc); err != nil {
+		return nil, errors.Join(checker.ErrUnparseableConfig, err)
+	}
+
+	if err := fc.Valid(); err != nil {
+		return nil, errors.Join(checker.ErrInvalidConfig, err)
+	}
+
+	pathRex, err := regexp.Compile(strings.TrimSpace(fc.Regex))
+	if err != nil {
+		return nil, errors.Join(ErrInvalidRegex, err)
+	}
+
+	return &Checker{
+		regexp: pathRex,
+		hash:   internal.FastHash(fc.String()),
+	}, nil
+}
+
+func (f Factory) Valid(ctx context.Context, data json.RawMessage) error {
+	var fc fileConfig
+
+	if err := json.Unmarshal([]byte(data), &fc); err != nil {
+		return errors.Join(checker.ErrUnparseableConfig, err)
+	}
+
+	return fc.Valid()
+}
+
+func Valid(pathRex string) error {
+	fc := fileConfig{
+		Regex: pathRex,
+	}
+
+	return fc.Valid()
+}

lib/checker/path/factory_test.go

@@ -0,0 +1,52 @@
+package path
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFactoryGood(t *testing.T) {
+	files, err := os.ReadDir("./testdata/good")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fac := Factory{}
+
+	for _, fname := range files {
+		t.Run(fname.Name(), func(t *testing.T) {
+			data, err := os.ReadFile(filepath.Join("testdata", "good", fname.Name()))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if err := fac.Valid(t.Context(), json.RawMessage(data)); err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}
+
+func TestFactoryBad(t *testing.T) {
+	files, err := os.ReadDir("./testdata/bad")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fac := Factory{}
+
+	for _, fname := range files {
+		t.Run(fname.Name(), func(t *testing.T) {
+			data, err := os.ReadFile(filepath.Join("testdata", "bad", fname.Name()))
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if err := fac.Valid(t.Context(), json.RawMessage(data)); err == nil {
+				t.Fatal("expected validation to fail")
+			}
+		})
+	}
+}

lib/checker/path/testdata/bad/invalid_regex.json

@@ -0,0 +1,3 @@
+{
+  "regex": "a(b"
+}

lib/checker/path/testdata/bad/nothing.json

@@ -0,0 +1 @@
+{}

lib/checker/path/testdata/good/simple.json

@@ -0,0 +1,3 @@
+{
+  "regex": "^/api/.*"
+}

lib/checker/path/testdata/good/wildcard.json

@@ -0,0 +1,3 @@
+{
+  "regex": ".*\\.json$"
+}

lib/checker/registry.go

@@ -0,0 +1,43 @@
+package checker
+
+import (
+	"context"
+	"encoding/json"
+	"sort"
+	"sync"
+)
+
+type Factory interface {
+	Build(context.Context, json.RawMessage) (Interface, error)
+	Valid(context.Context, json.RawMessage) error
+}
+
+var (
+	registry map[string]Factory = map[string]Factory{}
+	regLock  sync.RWMutex
+)
+
+func Register(name string, factory Factory) {
+	regLock.Lock()
+	defer regLock.Unlock()
+
+	registry[name] = factory
+}
+
+func Get(name string) (Factory, bool) {
+	regLock.RLock()
+	defer regLock.RUnlock()
+	result, ok := registry[name]
+	return result, ok
+}
+
+func Methods() []string {
+	regLock.RLock()
+	defer regLock.RUnlock()
+	var result []string
+	for method := range registry {
+		result = append(result, method)
+	}
+	sort.Strings(result)
+	return result
+}

lib/checker/remoteaddress/remoteaddress.go

@@ -0,0 +1,127 @@
+package remoteaddress
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/netip"
+
+	"github.com/TecharoHQ/anubis"
+	"github.com/TecharoHQ/anubis/internal"
+	"github.com/TecharoHQ/anubis/lib/checker"
+	"github.com/gaissmai/bart"
+)
+
+var (
+	ErrNoRemoteAddresses = errors.New("remoteaddress: no remote addresses defined")
+	ErrInvalidCIDR       = errors.New("remoteaddress: invalid CIDR")
+)
+
+func init() {
+	checker.Register("remote_address", Factory{})
+}
+
+type Factory struct{}
+
+func (Factory) Valid(_ context.Context, inp json.RawMessage) error {
+	var fc fileConfig
+	if err := json.Unmarshal([]byte(inp), &fc); err != nil {
+		return fmt.Errorf("%w: %w", checker.ErrUnparseableConfig, err)
+	}
+
+	if err := fc.Valid(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (Factory) Build(_ context.Context, inp json.RawMessage) (checker.Interface, error) {
+	c := struct {
+		RemoteAddr []netip.Prefix `json:"remote_addresses,omitempty" yaml:"remote_addresses,omitempty"`
+	}{}
+
+	if err := json.Unmarshal([]byte(inp), &c); err != nil {
+		return nil, fmt.Errorf("%w: %w", checker.ErrUnparseableConfig, err)
+	}
+
+	table := new(bart.Lite)
+
+	for _, cidr := range c.RemoteAddr {
+		table.Insert(cidr)
+	}
+
+	return &RemoteAddrChecker{
+		prefixTable: table,
+		hash:        internal.FastHash(string(inp)),
+	}, nil
+}
+
+type fileConfig struct {
+	RemoteAddr []string `json:"remote_addresses,omitempty" yaml:"remote_addresses,omitempty"`
+}
+
+func (fc fileConfig) Valid() error {
+	var errs []error
+
+	if len(fc.RemoteAddr) == 0 {
+		errs = append(errs, ErrNoRemoteAddresses)
+	}
+
+	for _, cidr := range fc.RemoteAddr {
+		if _, err := netip.ParsePrefix(cidr); err != nil {
+			errs = append(errs, fmt.Errorf("%w: cidr %q is invalid: %w", ErrInvalidCIDR, cidr, err))
+		}
+	}
+
+	if len(errs) != 0 {
+		return fmt.Errorf("%w: %w", checker.ErrInvalidConfig, errors.Join(errs...))
+	}
+
+	return nil
+}
+
+func Valid(cidrs []string) error {
+	fc := fileConfig{
+		RemoteAddr: cidrs,
+	}
+
+	return fc.Valid()
+}
+
+func New(cidrs []string) (checker.Interface, error) {
+	fc := fileConfig{
+		RemoteAddr: cidrs,
+	}
+	data, err := json.Marshal(fc)
+	if err != nil {
+		return nil, err
+	}
+
+	return Factory{}.Build(context.Background(), json.RawMessage(data))
+}
+
+type RemoteAddrChecker struct {
+	prefixTable *bart.Lite
+	hash        string
+}
+
+func (rac *RemoteAddrChecker) Check(r *http.Request) (bool, error) {
+	host := r.Header.Get("X-Real-Ip")
+	if host == "" {
+		return false, fmt.Errorf("%w: header X-Real-Ip is not set", anubis.ErrMisconfiguration)
+	}
+
+	addr, err := netip.ParseAddr(host)
+	if err != nil {
+		return false, fmt.Errorf("%w: %s is not an IP address: %w", anubis.ErrMisconfiguration, host, err)
+	}
+
+	return rac.prefixTable.Contains(addr), nil
+}
+
+func (rac *RemoteAddrChecker) Hash() string {
+	return rac.hash
+}

lib/checker/remoteaddress/remoteaddress_test.go

@@ -0,0 +1,138 @@
+package remoteaddress_test
+
+import (
+	_ "embed"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"testing"
+
+	"github.com/TecharoHQ/anubis/lib/checker"
+	"github.com/TecharoHQ/anubis/lib/checker/remoteaddress"
+)
+
+func TestFactoryIsCheckerFactory(t *testing.T) {
+	if _, ok := (any(remoteaddress.Factory{})).(checker.Factory); !ok {
+		t.Fatal("Factory is not an instance of checker.Factory")
+	}
+}
+
+func TestFactoryValidateConfig(t *testing.T) {
+	f := remoteaddress.Factory{}
+
+	for _, tt := range []struct {
+		name string
+		data []byte
+		err  error
+	}{
+		{
+			name: "basic valid",
+			data: []byte(`{
+  "remote_addresses": [
+    "1.1.1.1/32"
+  ]
+}`),
+		},
+		{
+			name: "not json",
+			data: []byte(`]`),
+			err:  checker.ErrUnparseableConfig,
+		},
+		{
+			name: "no cidr",
+			data: []byte(`{
+  "remote_addresses": []
+}`),
+			err: remoteaddress.ErrNoRemoteAddresses,
+		},
+		{
+			name: "bad cidr",
+			data: []byte(`{
+  "remote_addresses": [
+    "according to all laws of aviation"
+  ]
+}`),
+			err: remoteaddress.ErrInvalidCIDR,
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			data := json.RawMessage(tt.data)
+
+			if err := f.Valid(t.Context(), data); !errors.Is(err, tt.err) {
+				t.Logf("want: %v", tt.err)
+				t.Logf("got:  %v", err)
+				t.Fatal("validation didn't do what was expected")
+			}
+		})
+	}
+}
+
+func TestFactoryCreate(t *testing.T) {
+	f := remoteaddress.Factory{}
+
+	for _, tt := range []struct {
+		name  string
+		data  []byte
+		err   error
+		ip    string
+		match bool
+	}{
+		{
+			name: "basic valid",
+			data: []byte(`{
+  "remote_addresses": [
+    "1.1.1.1/32"
+  ]
+}`),
+			ip:    "1.1.1.1",
+			match: true,
+		},
+		{
+			name: "bad cidr",
+			data: []byte(`{
+  "remote_addresses": [
+    "according to all laws of aviation"
+  ]
+}`),
+			err: checker.ErrUnparseableConfig,
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			data := json.RawMessage(tt.data)
+
+			impl, err := f.Build(t.Context(), data)
+			if !errors.Is(err, tt.err) {
+				t.Logf("want: %v", tt.err)
+				t.Logf("got:  %v", err)
+				t.Fatal("creation didn't do what was expected")
+			}
+
+			if tt.err != nil {
+				return
+			}
+
+			r, err := http.NewRequest(http.MethodGet, "/", nil)
+			if err != nil {
+				t.Fatalf("can't make request: %v", err)
+			}
+
+			if tt.ip != "" {
+				r.Header.Add("X-Real-Ip", tt.ip)
+			}
+
+			match, err := impl.Check(r)
+
+			if tt.match != match {
+				t.Errorf("match: %v, wanted: %v", match, tt.match)
+			}
+
+			if err != nil && tt.err != nil && !errors.Is(err, tt.err) {
+				t.Errorf("err: %v, wanted: %v", err, tt.err)
+			}
+
+			if impl.Hash() == "" {
+				t.Error("hash method returns empty string")
+			}
+		})
+	}
+}

lib/checker/remoteaddress/testdata/invalid_bad_cidr.json

@@ -0,0 +1,5 @@
+{
+  "remote_addresses": [
+    "according to all laws of aviation"
+  ]
+}

lib/checker/remoteaddress/testdata/invalid_no_cidr.json

@@ -0,0 +1,3 @@
+{
+  "remote_addresses": []
+}

lib/checker/remoteaddress/testdata/invalid_not_json.json

@@ -0,0 +1 @@
+]

lib/checker/remoteaddress/testdata/valid_addresses.json

@@ -0,0 +1,5 @@
+{
+  "remote_addresses": [
+    "1.1.1.1/32"
+  ]
+}

lib/config_test.go

@@ -7,8 +7,8 @@ import (
 	"testing"
 
 	"github.com/TecharoHQ/anubis"
-	"github.com/TecharoHQ/anubis/internal/thoth/thothmock"
 	"github.com/TecharoHQ/anubis/lib/policy"
+	"github.com/TecharoHQ/anubis/lib/thoth/thothmock"
 )
 
 func TestInvalidChallengeMethod(t *testing.T) {

lib/http.go

@@ -198,7 +198,7 @@ func (s *Server) respondWithError(w http.ResponseWriter, r *http.Request, messag
 func (s *Server) respondWithStatus(w http.ResponseWriter, r *http.Request, msg string, status int) {
 	localizer := localization.GetLocalizer(r)
 
-	templ.Handler(web.Base(localizer.T("oh_noes"), web.ErrorPage(msg, s.opts.WebmasterEmail, r.FormValue("redir"), localizer), s.policy.Impressum, localizer), templ.WithStatus(status)).ServeHTTP(w, r)
+	templ.Handler(web.Base(localizer.T("oh_noes"), web.ErrorPage(msg, s.opts.WebmasterEmail, localizer), s.policy.Impressum, localizer), templ.WithStatus(status)).ServeHTTP(w, r)
 }
 
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {

lib/localization/locales/manifest.json

@@ -11,6 +11,8 @@
     "is",
     "it",
     "ja",
+    "nb",
+    "nn",
     "pt-BR",
     "ru",
     "tr",

lib/localization/locales/nb.json

@@ -0,0 +1,64 @@
+{
+  "loading": "Laster inn...",
+  "why_am_i_seeing": "Hvorfor ser jeg dette?",
+  "protected_by": "Beskyttet av",
+  "protected_from": "Fra",
+  "made_with": "Laget med ❤️ i 🇨🇦",
+  "mascot_design": "Maskotdesign av",
+  "ai_companies_explanation": "Du ser dette fordi administratoren av dette nettstedet har satt opp Anubis for å beskytte sørveren mot plagen av KI-selskaper som aggressivt skraper nettsteder. Dette kan, og fortsetter med å, forårsake driftstans for nettstedene, som gjør ressursene deres utilgjengelige for alle.",
+  "anubis_compromise": "Anubis er et kompromiss. Anubis bruker et «Proof-of-Work»-skjema som ligner på Hashcash, et lignende skjema for å redusere søppel-e-post. Idéen er at ved småstilte tilfeller er den ytterligere belastningen ignorerbar, men ved storstilt skraping samler den på seg fart og gjør det å skrape mye mer dyrt.",
+  "hack_purpose": "Til syvende og sist er dette en hack som har som formål å gi en «god nok» plassholderløsning slik at mer tid kan brukes på å fingeravtrykke og gjenkjenne hodeløse nettlesere (f.eks. hvordan de gjengir skrifttyper) slik at utfordringssiden ikke må bli vist til brukere som er mer sannsynligvis ekte.",
+  "jshelter_note": "NB: Anubis krever bruk av moderne JavaScript-funksjoner som tillegg som JShelter slår av. Vennligst slå av JShelter eller lignende tillegg for dette domenet.",
+  "version_info": "Dette nettstedet kjører Anubis-utgave",
+  "try_again": "Prøv igjen",
+  "go_home": "Gå hjem",
+  "contact_webmaster": "eller om du synes at du ikke burde være blokkert, vennligst ta kontakt med administratoren på",
+  "connection_security": "Vennligst vent mens vi bekrefter tryggheten av tilkoblingen din.",
+  "javascript_required": "Du må dessverre slå på JavaScript for å komme deg forbi denne utfordringen. Dette kreves fordi KI-selskaper har endret sosialkontrakten om hvordan nettstedsverting fungerer. En ikke-JS-løsning er i gang med å skapes.",
+  "benchmark_requires_js": "JavaScript må være påslått for å kjøre sammenligningsverktøyet.",
+  "difficulty": "Vanskelighetsnivå:",
+  "algorithm": "Algoritme:",
+  "compare": "Jevnfør:",
+  "time": "Tid",
+  "iters": "Gjentakelser",
+  "time_a": "Tid A",
+  "iters_a": "Gjentakelser A",
+  "time_b": "Tid B",
+  "iters_b": "Gjentakelser B",
+  "static_check_endpoint": "Dette er bare et sjekkeendepunkt for din omvendte proxy å bruke.",
+  "authorization_required": "Legitimasjon kreves",
+  "cookies_disabled": "Nettleseren din er konfigurert for å avslå informasjonskapsler. Anubis krever informasjonskapsler for å bekrefte at du er en ekte bruker. Vennligst slå på informasjonskapsler på dette domenet.",
+  "access_denied": "Adgang nektet: feilkode",
+  "dronebl_entry": "DroneBL rapporterte em oppføring.",
+  "see_dronebl_lookup": "se",
+  "internal_server_error": "Intern serverfeil: administratoren har feilkonfigurert Anubis. Vennligst ta kontakt med hen og spør hen om å se gjennom loggene om",
+  "invalid_redirect": "Ugyldig omdirigering",
+  "redirect_not_parseable": "Omdirigerings-URL-en kunne ikkj tolkes",
+  "redirect_domain_not_allowed": "Omdirigeringsdomenet er ikke tillatt",
+  "failed_to_sign_jwt": "mislyktes i å signere JWT",
+  "invalid_invocation": "Ugyldig fremkalling av MakeChallenge",
+  "client_error_browser": "Klientfeil: Vennligst sørg for at at nettleseren din er oppdatert og prøv igjen senere.",
+  "oh_noes": "Å nei!",
+  "benchmarking_anubis": "Sammenligner Anubis!",
+  "you_are_not_a_bot": "Du er ikke en bot!",
+  "making_sure_not_bot": "Bekrefter at du ikke er en bot!",
+  "celphase": "CELPHASE",
+  "js_web_crypto_error": "Nettleseren din har ikke et fungerande web.crypto-element. Ser du dette med ei sikker tilkopling?",
+  "js_web_workers_error": "Nettleseren din støtter ikke nettarbeidere (Anubis bruker dette for å unngå å fryse nettleseren din). Har du et tillegg som JShelter installert?",
+  "js_cookies_error": "Nettleseren lagrer ikke informasjonskapsler. Anubis bruker informasjonskapsler for å avgjøre hvilke klienter har lyktes i utfordringen ved å lagre en signert token i en informasjonskapsel. Vennligst slå på informasjonskapsler på dette domenet. Navnene på informasjonskapslene Anubis lagrer, kan variere uten varsel. Informasjonskapselnavn og -verdier er ikke en del av det offentlege API-et.",
+  "js_context_not_secure": "Du bruker ikke en sikker tilkobling!",
+  "js_context_not_secure_msg": "Prøv å koble til over HTTPS eller fortell administratoren å opprette HTTPS. Se <a hreflang=\"en\" href=\"https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts#when_is_a_context_considered_secure\">MDN</a> for mer informasjon.",
+  "js_calculating": "Beregner…",
+  "js_missing_feature": "Mangler funksjon",
+  "js_challenge_error": "Utfordringsfeil!",
+  "js_challenge_error_msg": "Mislyktes i å tolke sjekkalgoritmen. Du burde laste inn denne siden på nytt.",
+  "js_calculating_difficulty": "Beregner…<br/>Vanskelighetsnivå:",
+  "js_speed": "Hastighet:",
+  "js_verification_longer": "Verifisering tar lengre enn forventet. Vennligst ikke last inn denne siden på nytt.",
+  "js_success": "Vellykket!",
+  "js_done_took": "Ferdig! Tok",
+  "js_iterations": "gjentakelser",
+  "js_finished_reading": "Jeg har sluttet å lese, fortsett →",
+  "js_calculation_error": "Beregningsfeil!",
+  "js_calculation_error_msg": "Mislyktes i å beregne utfordring:"
+}

lib/localization/locales/nn.json

@@ -0,0 +1,64 @@
+{
+  "loading": "Lastar inn...",
+  "why_am_i_seeing": "Kvifor ser eg dette?",
+  "protected_by": "Verna av",
+  "protected_from": "Frå",
+  "made_with": "Laga med ❤️ i 🇨🇦",
+  "mascot_design": "Maskotdesign av",
+  "ai_companies_explanation": "Du ser dette av di administratoren av denne nettstaden har sett opp Anubis for å verne sørvaren mot plaga av KI-selskap som aggressivt skrapar nettstader. Dette kan, og held frem med å, forårsake driftstans for nettstadene, som gjer ressursane deira utilgjengelege for alle.",
+  "anubis_compromise": "Anubis er eit kompromiss. Anubis brukar eit «Proof-of-Work»-skjema som liknar på Hashcash, eit liknande skjema for å redusere søppel-e-post. Idéen er at ved småstilte tilfelle er den ytterlegare lastinga ignorerbar, men ved storstilt skraping samlar ho på seg fart og gjer det å skrapa mykje meir dyrt.",
+  "hack_purpose": "Til sjuande og sist er dette ein hack som har som formål å gje ei «god nok» plasshaldarløysing slik at meir tid kan brukast på å fingeravtrykkje og attkjenne hovudlause nettlesarar (f.eks. korleis dei attgjev skrifttypar) slik at utfordringssida ikkje må verte synt til brukarar som er meir sannsynlegvis ekte.",
+  "jshelter_note": "NB: Anubis krev bruk av moderne JavaScript-funksjonar som tillegg som JShelter slår av. Venlegast slå av JShelter eller liknande tillegg for dette domenet.",
+  "version_info": "Denne nettstaden køyrer Anubis-utgåve",
+  "try_again": "Prøv att",
+  "go_home": "Gå heim",
+  "contact_webmaster": "eller om du synest at du ikkje burde vera blokkert, venlegast tak kontakt med administratoren på",
+  "connection_security": "Venlegast vent medan vi stadfestar tryggleiken av tilkoplinga di.",
+  "javascript_required": "Du lyt diverre slå på JavaScript for å koma deg forbi denne utfordringa. Dette krevst av di KI-selskap har endra sosialkontrakten om korleis nettstadsverting fungerer. Ei ikkje-JS-løysing er i gang med å skapast.",
+  "benchmark_requires_js": "JavaScript må vera slegen på for å køyre samanlikningsverktøyet.",
+  "difficulty": "Vanskenivå:",
+  "algorithm": "Algoritme:",
+  "compare": "Jamfør:",
+  "time": "Tid",
+  "iters": "Oppattakingar",
+  "time_a": "Tid A",
+  "iters_a": "Oppattakingar A",
+  "time_b": "Tid B",
+  "iters_b": "Oppattakingar B",
+  "static_check_endpoint": "Dette er berre eit sjekkeendepunkt for din omvende proxy å bruke.",
+  "authorization_required": "Legitimasjon krevst",
+  "cookies_disabled": "Nettlesaren din er konfigurert for å avslå informasjonskapslar. Anubis krev informasjonskapslar for å stadfeste at du er ein ekte brukar. Venlegast slå på informasjonskapslar på dette domenet.",
+  "access_denied": "Tilgang nekta: feilkode",
+  "dronebl_entry": "DroneBL rapporterte ei oppføring.",
+  "see_dronebl_lookup": "sjå",
+  "internal_server_error": "Intern serverfeil: administratoren har feilkonfigurert Anubis. Venlegast tak kontakt med hen og spør hen om å sjå gjennom loggane om",
+  "invalid_redirect": "Ugyldig omdirigering",
+  "redirect_not_parseable": "Omdirigerings-URL-en kunne ikkje tolkast",
+  "redirect_domain_not_allowed": "Omdirigeringsdomenet er ikkje tillate",
+  "failed_to_sign_jwt": "mislukkast i å signere JWT",
+  "invalid_invocation": "Ugyldig framkalling av MakeChallenge",
+  "client_error_browser": "Klientfeil: Venlegast stadfest at nettlesaren din er oppdatert og prøv att seinare.",
+  "oh_noes": "Å nei!",
+  "benchmarking_anubis": "Samanliknar Anubis!",
+  "you_are_not_a_bot": "Du er ikkje ein bot!",
+  "making_sure_not_bot": "Stadfestar at du ikkje er ein bot!",
+  "celphase": "CELPHASE",
+  "js_web_crypto_error": "Nettlesaren din har ikkje eit fungerande web.crypto-element. Ser du dette med ei sikker tilkopling?",
+  "js_web_workers_error": "Nettlesaren din støttar ikkje nettarbeidarar (Anubis brukar dette for å unngå å fryse nettlesaren din). Har du eit tillegg som JShelter installert?",
+  "js_cookies_error": "Nettlesaren lagrar ikkje informasjonskapslar. Anubis brukar informasjonskapslar for å avgjera kva klientar har lukkast i utfordringa ved å lagra ein signert token i ein informasjonskapsel. Venlegast slå på informasjonskapslar på dette domenet. Namna på informasjonskapslane Anubis lagrar, kan variere utan varsel. Informasjonskapselnamn og -verdiar er ikkje ein del av det offentlege API-et.",
+  "js_context_not_secure": "Du brukar ikkje ei sikker tilkopling!",
+  "js_context_not_secure_msg": "Prøv å kople til over HTTPS eller fortel administratoren å opprette HTTPS. Sjå <a hreflang=\"en\" href=\"https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts#when_is_a_context_considered_secure\">MDN</a> for fleire opplysingar.",
+  "js_calculating": "Reknar…",
+  "js_missing_feature": "Manglar funksjon",
+  "js_challenge_error": "Utfordringsfeil!",
+  "js_challenge_error_msg": "Mislukkast i å tolke sjekkalgoritmen. Du burde laste inn denne sida på nytt.",
+  "js_calculating_difficulty": "Reknar…<br/>Vanskenivå:",
+  "js_speed": "Fart:",
+  "js_verification_longer": "Verifisering tek lengre enn forventa. Venlegast ikkje last inn denne sida på nytt.",
+  "js_success": "Vellykka!",
+  "js_done_took": "Ferdig! Tok",
+  "js_iterations": "oppattakingar",
+  "js_finished_reading": "Eg har slutta å lesa, hald fram →",
+  "js_calculation_error": "Rekningsfeil!",
+  "js_calculation_error_msg": "Mislukkast i å rekne utfordring:"
+}

lib/localization/localization_test.go

@@ -21,6 +21,8 @@ func TestLocalizationService(t *testing.T) {
 		"fr":    "Chargement...",
 		"ja":    "ロード中...",
 		"is":    "Hleður...",
+		"nb":    "Laster inn...",
+		"nn":    "Lastar inn...",
 		"pt-BR": "Carregando...",
 		"tr":    "Yükleniyor...",
 		"ru":    "Загрузка...",
@@ -28,7 +30,16 @@ func TestLocalizationService(t *testing.T) {
 		"zh-TW": "載入中...",
 	}
 
-	for lang, expected := range loadingStrMap {
+	var keys []string
+
+	for lang := range loadingStrMap {
+		keys = append(keys, lang)
+	}
+
+	sort.Strings(keys)
+
+	for _, lang := range keys {
+		expected := loadingStrMap[lang]
 		t.Run(fmt.Sprintf("%s localization", lang), func(t *testing.T) {
 			localizer := service.GetLocalizer(lang)
 			result := localizer.MustLocalize(&i18n.LocalizeConfig{MessageID: "loading"})
@@ -44,7 +55,7 @@ func TestLocalizationService(t *testing.T) {
 		"mascot_design", "try_again", "go_home", "javascript_required",
 	}
 
-	for lang := range loadingStrMap {
+	for _, lang := range keys {
 		t.Run(fmt.Sprintf("All required keys exist in %s", lang), func(t *testing.T) {
 			loc := service.GetLocalizer(lang)
 			for _, key := range requiredKeys {

lib/policy/bot.go

@@ -4,12 +4,12 @@ import (
 	"fmt"
 
 	"github.com/TecharoHQ/anubis/internal"
-	"github.com/TecharoHQ/anubis/lib/policy/checker"
+	"github.com/TecharoHQ/anubis/lib/checker"
 	"github.com/TecharoHQ/anubis/lib/policy/config"
 )
 
 type Bot struct {
-	Rules     checker.Impl
+	Rules     checker.Interface
 	Challenge *config.ChallengeRules
 	Weight    *config.Weight
 	Name      string

lib/policy/checker.go

@@ -3,153 +3,39 @@ package policy
 import (
 	"errors"
 	"fmt"
-	"net/http"
-	"net/netip"
-	"regexp"
+	"sort"
 	"strings"
 
-	"github.com/TecharoHQ/anubis/internal"
-	"github.com/TecharoHQ/anubis/lib/policy/checker"
-	"github.com/gaissmai/bart"
+	"github.com/TecharoHQ/anubis/lib/checker"
+	"github.com/TecharoHQ/anubis/lib/checker/headerexists"
+	"github.com/TecharoHQ/anubis/lib/checker/headermatches"
 )
 
-var (
-	ErrMisconfiguration = errors.New("[unexpected] policy: administrator misconfiguration")
-)
-
-type RemoteAddrChecker struct {
-	prefixTable *bart.Lite
-	hash        string
-}
-
-func NewRemoteAddrChecker(cidrs []string) (checker.Impl, error) {
-	table := new(bart.Lite)
-
-	for _, cidr := range cidrs {
-		prefix, err := netip.ParsePrefix(cidr)
-		if err != nil {
-			return nil, fmt.Errorf("%w: range %s not parsing: %w", ErrMisconfiguration, cidr, err)
-		}
-
-		table.Insert(prefix)
-	}
-
-	return &RemoteAddrChecker{
-		prefixTable: table,
-		hash:        internal.FastHash(strings.Join(cidrs, ",")),
-	}, nil
-}
-
-func (rac *RemoteAddrChecker) Check(r *http.Request) (bool, error) {
-	host := r.Header.Get("X-Real-Ip")
-	if host == "" {
-		return false, fmt.Errorf("%w: header X-Real-Ip is not set", ErrMisconfiguration)
-	}
-
-	addr, err := netip.ParseAddr(host)
-	if err != nil {
-		return false, fmt.Errorf("%w: %s is not an IP address: %w", ErrMisconfiguration, host, err)
-	}
-
-	return rac.prefixTable.Contains(addr), nil
-}
-
-func (rac *RemoteAddrChecker) Hash() string {
-	return rac.hash
-}
-
-type HeaderMatchesChecker struct {
-	header string
-	regexp *regexp.Regexp
-	hash   string
-}
-
-func NewUserAgentChecker(rexStr string) (checker.Impl, error) {
-	return NewHeaderMatchesChecker("User-Agent", rexStr)
-}
-
-func NewHeaderMatchesChecker(header, rexStr string) (checker.Impl, error) {
-	rex, err := regexp.Compile(strings.TrimSpace(rexStr))
-	if err != nil {
-		return nil, fmt.Errorf("%w: regex %s failed parse: %w", ErrMisconfiguration, rexStr, err)
-	}
-	return &HeaderMatchesChecker{strings.TrimSpace(header), rex, internal.FastHash(header + ": " + rexStr)}, nil
-}
-
-func (hmc *HeaderMatchesChecker) Check(r *http.Request) (bool, error) {
-	if hmc.regexp.MatchString(r.Header.Get(hmc.header)) {
-		return true, nil
-	}
-
-	return false, nil
-}
-
-func (hmc *HeaderMatchesChecker) Hash() string {
-	return hmc.hash
-}
-
-type PathChecker struct {
-	regexp *regexp.Regexp
-	hash   string
-}
-
-func NewPathChecker(rexStr string) (checker.Impl, error) {
-	rex, err := regexp.Compile(strings.TrimSpace(rexStr))
-	if err != nil {
-		return nil, fmt.Errorf("%w: regex %s failed parse: %w", ErrMisconfiguration, rexStr, err)
-	}
-	return &PathChecker{rex, internal.FastHash(rexStr)}, nil
-}
-
-func (pc *PathChecker) Check(r *http.Request) (bool, error) {
-	if pc.regexp.MatchString(r.URL.Path) {
-		return true, nil
-	}
-
-	return false, nil
-}
-
-func (pc *PathChecker) Hash() string {
-	return pc.hash
-}
-
-func NewHeaderExistsChecker(key string) checker.Impl {
-	return headerExistsChecker{strings.TrimSpace(key)}
-}
-
-type headerExistsChecker struct {
-	header string
-}
-
-func (hec headerExistsChecker) Check(r *http.Request) (bool, error) {
-	if r.Header.Get(hec.header) != "" {
-		return true, nil
-	}
-
-	return false, nil
-}
-
-func (hec headerExistsChecker) Hash() string {
-	return internal.FastHash(hec.header)
-}
-
-func NewHeadersChecker(headermap map[string]string) (checker.Impl, error) {
-	var result checker.List
+func NewHeadersChecker(headermap map[string]string) (checker.Interface, error) {
+	var result checker.All
 	var errs []error
 
-	for key, rexStr := range headermap {
+	var keys []string
+	for key := range headermap {
+		keys = append(keys, key)
+	}
+
+	sort.Strings(keys)
+
+	for _, key := range keys {
+		rexStr := headermap[key]
 		if rexStr == ".*" {
-			result = append(result, headerExistsChecker{strings.TrimSpace(key)})
+			result = append(result, headerexists.New(strings.TrimSpace(key)))
 			continue
 		}
 
-		rex, err := regexp.Compile(strings.TrimSpace(rexStr))
+		c, err := headermatches.New(key, rexStr)
 		if err != nil {
-			errs = append(errs, fmt.Errorf("while compiling header %s regex %s: %w", key, rexStr, err))
+			errs = append(errs, fmt.Errorf("while parsing header %s regex %s: %w", key, rexStr, err))
 			continue
 		}
 
-		result = append(result, &HeaderMatchesChecker{key, rex, internal.FastHash(key + ": " + rexStr)})
+		result = append(result, c)
 	}
 
 	if len(errs) != 0 {

lib/policy/checker/checker.go

@@ -1,41 +0,0 @@
-// Package checker defines the Checker interface and a helper utility to avoid import cycles.
-package checker
-
-import (
-	"fmt"
-	"net/http"
-	"strings"
-
-	"github.com/TecharoHQ/anubis/internal"
-)
-
-type Impl interface {
-	Check(*http.Request) (bool, error)
-	Hash() string
-}
-
-type List []Impl
-
-func (l List) Check(r *http.Request) (bool, error) {
-	for _, c := range l {
-		ok, err := c.Check(r)
-		if err != nil {
-			return ok, err
-		}
-		if ok {
-			return ok, nil
-		}
-	}
-
-	return false, nil
-}
-
-func (l List) Hash() string {
-	var sb strings.Builder
-
-	for _, c := range l {
-		fmt.Fprintln(&sb, c.Hash())
-	}
-
-	return internal.FastHash(sb.String())
-}

lib/policy/checker_test.go

@@ -1,200 +0,0 @@
-package policy
-
-import (
-	"errors"
-	"net/http"
-	"testing"
-)
-
-func TestRemoteAddrChecker(t *testing.T) {
-	for _, tt := range []struct {
-		err   error
-		name  string
-		ip    string
-		cidrs []string
-		ok    bool
-	}{
-		{
-			name:  "match_ipv4",
-			cidrs: []string{"0.0.0.0/0"},
-			ip:    "1.1.1.1",
-			ok:    true,
-			err:   nil,
-		},
-		{
-			name:  "match_ipv6",
-			cidrs: []string{"::/0"},
-			ip:    "cafe:babe::",
-			ok:    true,
-			err:   nil,
-		},
-		{
-			name:  "not_match_ipv4",
-			cidrs: []string{"1.1.1.1/32"},
-			ip:    "1.1.1.2",
-			ok:    false,
-			err:   nil,
-		},
-		{
-			name:  "not_match_ipv6",
-			cidrs: []string{"cafe:babe::/128"},
-			ip:    "cafe:babe:4::/128",
-			ok:    false,
-			err:   nil,
-		},
-		{
-			name:  "no_ip_set",
-			cidrs: []string{"::/0"},
-			ok:    false,
-			err:   ErrMisconfiguration,
-		},
-		{
-			name:  "invalid_ip",
-			cidrs: []string{"::/0"},
-			ip:    "According to all natural laws of aviation",
-			ok:    false,
-			err:   ErrMisconfiguration,
-		},
-	} {
-		t.Run(tt.name, func(t *testing.T) {
-			rac, err := NewRemoteAddrChecker(tt.cidrs)
-			if err != nil && !errors.Is(err, tt.err) {
-				t.Fatalf("creating RemoteAddrChecker failed: %v", err)
-			}
-
-			r, err := http.NewRequest(http.MethodGet, "/", nil)
-			if err != nil {
-				t.Fatalf("can't make request: %v", err)
-			}
-
-			if tt.ip != "" {
-				r.Header.Add("X-Real-Ip", tt.ip)
-			}
-
-			ok, err := rac.Check(r)
-
-			if tt.ok != ok {
-				t.Errorf("ok: %v, wanted: %v", ok, tt.ok)
-			}
-
-			if err != nil && tt.err != nil && !errors.Is(err, tt.err) {
-				t.Errorf("err: %v, wanted: %v", err, tt.err)
-			}
-		})
-	}
-}
-
-func TestHeaderMatchesChecker(t *testing.T) {
-	for _, tt := range []struct {
-		err            error
-		name           string
-		header         string
-		rexStr         string
-		reqHeaderKey   string
-		reqHeaderValue string
-		ok             bool
-	}{
-		{
-			name:           "match",
-			header:         "Cf-Worker",
-			rexStr:         ".*",
-			reqHeaderKey:   "Cf-Worker",
-			reqHeaderValue: "true",
-			ok:             true,
-			err:            nil,
-		},
-		{
-			name:           "not_match",
-			header:         "Cf-Worker",
-			rexStr:         "false",
-			reqHeaderKey:   "Cf-Worker",
-			reqHeaderValue: "true",
-			ok:             false,
-			err:            nil,
-		},
-		{
-			name:           "not_present",
-			header:         "Cf-Worker",
-			rexStr:         "foobar",
-			reqHeaderKey:   "Something-Else",
-			reqHeaderValue: "true",
-			ok:             false,
-			err:            nil,
-		},
-		{
-			name:   "invalid_regex",
-			rexStr: "a(b",
-			err:    ErrMisconfiguration,
-		},
-	} {
-		t.Run(tt.name, func(t *testing.T) {
-			hmc, err := NewHeaderMatchesChecker(tt.header, tt.rexStr)
-			if err != nil && !errors.Is(err, tt.err) {
-				t.Fatalf("creating HeaderMatchesChecker failed")
-			}
-
-			if tt.err != nil && hmc == nil {
-				return
-			}
-
-			r, err := http.NewRequest(http.MethodGet, "/", nil)
-			if err != nil {
-				t.Fatalf("can't make request: %v", err)
-			}
-
-			r.Header.Set(tt.reqHeaderKey, tt.reqHeaderValue)
-
-			ok, err := hmc.Check(r)
-
-			if tt.ok != ok {
-				t.Errorf("ok: %v, wanted: %v", ok, tt.ok)
-			}
-
-			if err != nil && tt.err != nil && !errors.Is(err, tt.err) {
-				t.Errorf("err: %v, wanted: %v", err, tt.err)
-			}
-		})
-	}
-}
-
-func TestHeaderExistsChecker(t *testing.T) {
-	for _, tt := range []struct {
-		name      string
-		header    string
-		reqHeader string
-		ok        bool
-	}{
-		{
-			name:      "match",
-			header:    "Authorization",
-			reqHeader: "Authorization",
-			ok:        true,
-		},
-		{
-			name:      "not_match",
-			header:    "Authorization",
-			reqHeader: "Authentication",
-		},
-	} {
-		t.Run(tt.name, func(t *testing.T) {
-			hec := headerExistsChecker{tt.header}
-
-			r, err := http.NewRequest(http.MethodGet, "/", nil)
-			if err != nil {
-				t.Fatalf("can't make request: %v", err)
-			}
-
-			r.Header.Set(tt.reqHeader, "hunter2")
-
-			ok, err := hec.Check(r)
-
-			if tt.ok != ok {
-				t.Errorf("ok: %v, wanted: %v", ok, tt.ok)
-			}
-
-			if err != nil {
-				t.Errorf("err: %v", err)
-			}
-		})
-	}
-}

lib/policy/config/config.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
-	"net"
 	"net/http"
 	"os"
 	"regexp"
@@ -13,6 +12,10 @@ import (
 	"time"
 
 	"github.com/TecharoHQ/anubis/data"
+	"github.com/TecharoHQ/anubis/lib/checker/expression"
+	"github.com/TecharoHQ/anubis/lib/checker/headermatches"
+	"github.com/TecharoHQ/anubis/lib/checker/path"
+	"github.com/TecharoHQ/anubis/lib/checker/remoteaddress"
 	"k8s.io/apimachinery/pkg/util/yaml"
 )
 
@@ -25,12 +28,12 @@ var (
 	ErrInvalidUserAgentRegex             = errors.New("config.Bot: invalid user agent regex")
 	ErrInvalidPathRegex                  = errors.New("config.Bot: invalid path regex")
 	ErrInvalidHeadersRegex               = errors.New("config.Bot: invalid headers regex")
-	ErrInvalidCIDR                       = errors.New("config.Bot: invalid CIDR")
 	ErrRegexEndsWithNewline              = errors.New("config.Bot: regular expression ends with newline (try >- instead of > in yaml)")
 	ErrInvalidImportStatement            = errors.New("config.ImportStatement: invalid source file")
 	ErrCantSetBotAndImportValuesAtOnce   = errors.New("config.BotOrImport: can't set bot rules and import values at the same time")
 	ErrMustSetBotOrImportRules           = errors.New("config.BotOrImport: rule definition is invalid, you must set either bot rules or an import statement, not both")
 	ErrStatusCodeNotValid                = errors.New("config.StatusCode: status code not valid, must be between 100 and 599")
+	ErrUnparseableConfig                 = errors.New("config: can't parse configuration file")
 )
 
 type Rule string
@@ -56,15 +59,15 @@ func (r Rule) Valid() error {
 const DefaultAlgorithm = "fast"
 
 type BotConfig struct {
-	UserAgentRegex *string           `json:"user_agent_regex,omitempty" yaml:"user_agent_regex,omitempty"`
-	PathRegex      *string           `json:"path_regex,omitempty" yaml:"path_regex,omitempty"`
-	HeadersRegex   map[string]string `json:"headers_regex,omitempty" yaml:"headers_regex,omitempty"`
-	Expression     *ExpressionOrList `json:"expression,omitempty" yaml:"expression,omitempty"`
-	Challenge      *ChallengeRules   `json:"challenge,omitempty" yaml:"challenge,omitempty"`
-	Weight         *Weight           `json:"weight,omitempty" yaml:"weight,omitempty"`
-	Name           string            `json:"name" yaml:"name"`
-	Action         Rule              `json:"action" yaml:"action"`
-	RemoteAddr     []string          `json:"remote_addresses,omitempty" yaml:"remote_addresses,omitempty"`
+	UserAgentRegex *string            `json:"user_agent_regex,omitempty" yaml:"user_agent_regex,omitempty"`
+	PathRegex      *string            `json:"path_regex,omitempty" yaml:"path_regex,omitempty"`
+	HeadersRegex   map[string]string  `json:"headers_regex,omitempty" yaml:"headers_regex,omitempty"`
+	Expression     *expression.Config `json:"expression,omitempty" yaml:"expression,omitempty"`
+	Challenge      *ChallengeRules    `json:"challenge,omitempty" yaml:"challenge,omitempty"`
+	Weight         *Weight            `json:"weight,omitempty" yaml:"weight,omitempty"`
+	Name           string             `json:"name" yaml:"name"`
+	Action         Rule               `json:"action" yaml:"action"`
+	RemoteAddr     []string           `json:"remote_addresses,omitempty" yaml:"remote_addresses,omitempty"`
 
 	// Thoth features
 	GeoIP *GeoIP `json:"geoip,omitempty"`
@@ -118,7 +121,7 @@ func (b *BotConfig) Valid() error {
 			errs = append(errs, fmt.Errorf("%w: user agent regex: %q", ErrRegexEndsWithNewline, *b.UserAgentRegex))
 		}
 
-		if _, err := regexp.Compile(*b.UserAgentRegex); err != nil {
+		if err := headermatches.ValidUserAgent(*b.UserAgentRegex); err != nil {
 			errs = append(errs, ErrInvalidUserAgentRegex, err)
 		}
 	}
@@ -128,7 +131,7 @@ func (b *BotConfig) Valid() error {
 			errs = append(errs, fmt.Errorf("%w: path regex: %q", ErrRegexEndsWithNewline, *b.PathRegex))
 		}
 
-		if _, err := regexp.Compile(*b.PathRegex); err != nil {
+		if err := path.Valid(*b.PathRegex); err != nil {
 			errs = append(errs, ErrInvalidPathRegex, err)
 		}
 	}
@@ -150,10 +153,8 @@ func (b *BotConfig) Valid() error {
 	}
 
 	if len(b.RemoteAddr) > 0 {
-		for _, cidr := range b.RemoteAddr {
-			if _, _, err := net.ParseCIDR(cidr); err != nil {
-				errs = append(errs, ErrInvalidCIDR, err)
-			}
+		if err := remoteaddress.Valid(b.RemoteAddr); err != nil {
+			errs = append(errs, err)
 		}
 	}
 

lib/policy/config/config_test.go

@@ -8,6 +8,7 @@ import (
 	"testing"
 
 	"github.com/TecharoHQ/anubis/data"
+	"github.com/TecharoHQ/anubis/lib/checker/remoteaddress"
 	. "github.com/TecharoHQ/anubis/lib/policy/config"
 )
 
@@ -137,7 +138,7 @@ func TestBotValid(t *testing.T) {
 				Action:     RuleAllow,
 				RemoteAddr: []string{"0.0.0.0/33"},
 			},
-			err: ErrInvalidCIDR,
+			err: remoteaddress.ErrInvalidCIDR,
 		},
 		{
 			name: "only filter by IP range",

lib/policy/config/threshold.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"github.com/TecharoHQ/anubis"
+	"github.com/TecharoHQ/anubis/lib/checker/expression"
 )
 
 var (
@@ -17,7 +18,7 @@ var (
 	DefaultThresholds = []Threshold{
 		{
 			Name: "legacy-anubis-behaviour",
-			Expression: &ExpressionOrList{
+			Expression: &expression.Config{
 				Expression: "weight > 0",
 			},
 			Action: RuleChallenge,
@@ -31,10 +32,10 @@ var (
 )
 
 type Threshold struct {
-	Name       string            `json:"name" yaml:"name"`
-	Expression *ExpressionOrList `json:"expression" yaml:"expression"`
-	Action     Rule              `json:"action" yaml:"action"`
-	Challenge  *ChallengeRules   `json:"challenge" yaml:"challenge"`
+	Name       string             `json:"name" yaml:"name"`
+	Expression *expression.Config `json:"expression" yaml:"expression"`
+	Action     Rule               `json:"action" yaml:"action"`
+	Challenge  *ChallengeRules    `json:"challenge" yaml:"challenge"`
 }
 
 func (t Threshold) Valid() error {

lib/policy/config/threshold_test.go

@@ -6,6 +6,8 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+
+	"github.com/TecharoHQ/anubis/lib/checker/expression"
 )
 
 func TestThresholdValid(t *testing.T) {
@@ -18,7 +20,7 @@ func TestThresholdValid(t *testing.T) {
 			name: "basic allow",
 			input: &Threshold{
 				Name:       "basic-allow",
-				Expression: &ExpressionOrList{Expression: "true"},
+				Expression: &expression.Config{Expression: "true"},
 				Action:     RuleAllow,
 			},
 			err: nil,
@@ -27,7 +29,7 @@ func TestThresholdValid(t *testing.T) {
 			name: "basic challenge",
 			input: &Threshold{
 				Name:       "basic-challenge",
-				Expression: &ExpressionOrList{Expression: "true"},
+				Expression: &expression.Config{Expression: "true"},
 				Action:     RuleChallenge,
 				Challenge: &ChallengeRules{
 					Algorithm:  "fast",
@@ -50,9 +52,9 @@ func TestThresholdValid(t *testing.T) {
 		{
 			name: "invalid expression",
 			input: &Threshold{
-				Expression: &ExpressionOrList{},
+				Expression: &expression.Config{},
 			},
-			err: ErrExpressionEmpty,
+			err: expression.ErrExpressionEmpty,
 		},
 		{
 			name:  "invalid action",

lib/policy/policy.go

@@ -8,10 +8,14 @@ import (
 	"log/slog"
 	"sync/atomic"
 
-	"github.com/TecharoHQ/anubis/internal/thoth"
-	"github.com/TecharoHQ/anubis/lib/policy/checker"
+	"github.com/TecharoHQ/anubis/lib/checker"
+	"github.com/TecharoHQ/anubis/lib/checker/expression"
+	"github.com/TecharoHQ/anubis/lib/checker/headermatches"
+	"github.com/TecharoHQ/anubis/lib/checker/path"
+	"github.com/TecharoHQ/anubis/lib/checker/remoteaddress"
 	"github.com/TecharoHQ/anubis/lib/policy/config"
 	"github.com/TecharoHQ/anubis/lib/store"
+	"github.com/TecharoHQ/anubis/lib/thoth"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 
@@ -73,10 +77,10 @@ func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDiffic
 			Action: b.Action,
 		}
 
-		cl := checker.List{}
+		cl := checker.Any{}
 
 		if len(b.RemoteAddr) > 0 {
-			c, err := NewRemoteAddrChecker(b.RemoteAddr)
+			c, err := remoteaddress.New(b.RemoteAddr)
 			if err != nil {
 				validationErrs = append(validationErrs, fmt.Errorf("while processing rule %s remote addr set: %w", b.Name, err))
 			} else {
@@ -85,7 +89,7 @@ func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDiffic
 		}
 
 		if b.UserAgentRegex != nil {
-			c, err := NewUserAgentChecker(*b.UserAgentRegex)
+			c, err := headermatches.NewUserAgent(*b.UserAgentRegex)
 			if err != nil {
 				validationErrs = append(validationErrs, fmt.Errorf("while processing rule %s user agent regex: %w", b.Name, err))
 			} else {
@@ -94,7 +98,7 @@ func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDiffic
 		}
 
 		if b.PathRegex != nil {
-			c, err := NewPathChecker(*b.PathRegex)
+			c, err := path.New(*b.PathRegex)
 			if err != nil {
 				validationErrs = append(validationErrs, fmt.Errorf("while processing rule %s path regex: %w", b.Name, err))
 			} else {
@@ -112,7 +116,7 @@ func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDiffic
 		}
 
 		if b.Expression != nil {
-			c, err := NewCELChecker(b.Expression)
+			c, err := expression.New(b.Expression)
 			if err != nil {
 				validationErrs = append(validationErrs, fmt.Errorf("while processing rule %s expressions: %w", b.Name, err))
 			} else {

lib/policy/policy_test.go

@@ -7,7 +7,7 @@ import (
 
 	"github.com/TecharoHQ/anubis"
 	"github.com/TecharoHQ/anubis/data"
-	"github.com/TecharoHQ/anubis/internal/thoth/thothmock"
+	"github.com/TecharoHQ/anubis/lib/thoth/thothmock"
 )
 
 func TestDefaultPolicyMustParse(t *testing.T) {

lib/policy/thresholds.go

@@ -1,8 +1,8 @@
 package policy
 
 import (
+	"github.com/TecharoHQ/anubis/lib/checker/expression/environment"
 	"github.com/TecharoHQ/anubis/lib/policy/config"
-	"github.com/TecharoHQ/anubis/lib/policy/expressions"
 	"github.com/google/cel-go/cel"
 )
 
@@ -16,12 +16,12 @@ func ParsedThresholdFromConfig(t config.Threshold) (*Threshold, error) {
 		Threshold: t,
 	}
 
-	env, err := expressions.ThresholdEnvironment()
+	env, err := environment.Threshold()
 	if err != nil {
 		return nil, err
 	}
 
-	program, err := expressions.Compile(env, t.Expression.String())
+	program, err := environment.Compile(env, t.Expression.String())
 	if err != nil {
 		return nil, err
 	}

lib/testdata/permissive.yaml

@@ -0,0 +1,4 @@
+bots:
+  - import: (data)/common/allow-private-addresses.yaml
+
+dnsbl: false

lib/thoth/asnchecker.go

@@ -10,11 +10,11 @@ import (
 	"time"
 
 	"github.com/TecharoHQ/anubis/internal"
-	"github.com/TecharoHQ/anubis/lib/policy/checker"
+	"github.com/TecharoHQ/anubis/lib/checker"
 	iptoasnv1 "github.com/TecharoHQ/thoth-proto/gen/techaro/thoth/iptoasn/v1"
 )
 
-func (c *Client) ASNCheckerFor(asns []uint32) checker.Impl {
+func (c *Client) ASNCheckerFor(asns []uint32) checker.Interface {
 	asnMap := map[uint32]struct{}{}
 	var sb strings.Builder
 	fmt.Fprintln(&sb, "ASNChecker")

lib/thoth/asnchecker_test.go

@@ -5,12 +5,12 @@ import (
 	"net/http/httptest"
 	"testing"
 
-	"github.com/TecharoHQ/anubis/internal/thoth"
-	"github.com/TecharoHQ/anubis/lib/policy/checker"
+	"github.com/TecharoHQ/anubis/lib/checker"
+	"github.com/TecharoHQ/anubis/lib/thoth"
 	iptoasnv1 "github.com/TecharoHQ/thoth-proto/gen/techaro/thoth/iptoasn/v1"
 )
 
-var _ checker.Impl = &thoth.ASNChecker{}
+var _ checker.Interface = &thoth.ASNChecker{}
 
 func TestASNChecker(t *testing.T) {
 	cli := loadSecrets(t)

lib/thoth/geoipchecker.go

@@ -9,11 +9,11 @@ import (
 	"strings"
 	"time"
 
-	"github.com/TecharoHQ/anubis/lib/policy/checker"
+	"github.com/TecharoHQ/anubis/lib/checker"
 	iptoasnv1 "github.com/TecharoHQ/thoth-proto/gen/techaro/thoth/iptoasn/v1"
 )
 
-func (c *Client) GeoIPCheckerFor(countries []string) checker.Impl {
+func (c *Client) GeoIPCheckerFor(countries []string) checker.Interface {
 	countryMap := map[string]struct{}{}
 	var sb strings.Builder
 	fmt.Fprintln(&sb, "GeoIPChecker")

lib/thoth/geoipchecker_test.go

@@ -5,11 +5,11 @@ import (
 	"net/http/httptest"
 	"testing"
 
-	"github.com/TecharoHQ/anubis/internal/thoth"
-	"github.com/TecharoHQ/anubis/lib/policy/checker"
+	"github.com/TecharoHQ/anubis/lib/checker"
+	"github.com/TecharoHQ/anubis/lib/thoth"
 )
 
-var _ checker.Impl = &thoth.GeoIPChecker{}
+var _ checker.Interface = &thoth.GeoIPChecker{}
 
 func TestGeoIPChecker(t *testing.T) {
 	cli := loadSecrets(t)

lib/thoth/thoth_test.go

@@ -4,8 +4,8 @@ import (
 	"os"
 	"testing"
 
-	"github.com/TecharoHQ/anubis/internal/thoth"
-	"github.com/TecharoHQ/anubis/internal/thoth/thothmock"
+	"github.com/TecharoHQ/anubis/lib/thoth"
+	"github.com/TecharoHQ/anubis/lib/thoth/thothmock"
 	"github.com/joho/godotenv"
 )
 

lib/thoth/thothmock/withthothmock.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"testing"
 
-	"github.com/TecharoHQ/anubis/internal/thoth"
+	"github.com/TecharoHQ/anubis/lib/thoth"
 )
 
 func WithMockThoth(t *testing.T) context.Context {

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@techaro/anubis",
-  "version": "1.21.0",
+  "version": "1.21.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@techaro/anubis",
-      "version": "1.21.0",
+      "version": "1.21.3",
       "license": "ISC",
       "devDependencies": {
         "cssnano": "^7.1.0",