fix(web): amend future leak on proof of work solution

Possible fix for #877

In some cases, the parallel solution finder in Anubis could cause
all of the worker promises to leak due to the fact the promises
were being improperly terminated. A recursion bomb happens in the
following scenario:

1. A worker sends a message indicating it found a solution to the proof
   of work challenge.
2. The `onmessage` handler for that worker calls `terminate()`
3. Inside `terminate()`, the parent process loops through all other
   workers and calls `w.terminate()` on them.
4. It's possible that terminating a worker could lead to the `onerror`
   event handler.
5. This would create a recursive loop of `onmessage` -> `terminate` ->
   `onerror` -> `terminate` -> `onerror` and so on.

This infinite recursion quickly consumes all available stack space, but
this has never been noticed in development because all of my computers
have at least 64Gi of ram provisioned to them under the axiom paying for
more ram is cheaper than paying in my time spent having to work around
not having enough ram. Additionally, ia32 has a smaller base stack size,
which means that they will run into this issue much sooner than users on
other CPU architectures will.

The fix adds a boolean `settled` flag to prevent termination from
running more than once.

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

.github/workflows/docs-deploy.yml

@@ -53,14 +53,14 @@ jobs:
           push: true
 
       - name: Apply k8s manifests to limsa lominsa
-        uses: actions-hub/kubectl@d50394b7d704525f93faefce1e65a6329ff67271 # v1.33.2
+        uses: actions-hub/kubectl@b5b19eeb6a0ffde16637e398f8b96ef01eb8fdb7 # v1.33.3
         env:
           KUBE_CONFIG: ${{ secrets.LIMSA_LOMINSA_KUBECONFIG }}
         with:
           args: apply -k docs/manifest
 
       - name: Apply k8s manifests to limsa lominsa
-        uses: actions-hub/kubectl@d50394b7d704525f93faefce1e65a6329ff67271 # v1.33.2
+        uses: actions-hub/kubectl@b5b19eeb6a0ffde16637e398f8b96ef01eb8fdb7 # v1.33.3
         env:
           KUBE_CONFIG: ${{ secrets.LIMSA_LOMINSA_KUBECONFIG }}
         with:

.github/workflows/zizmor.yml

@@ -21,7 +21,7 @@ jobs:
           persist-credentials: false
 
       - name: Install the latest version of uv
-        uses: astral-sh/setup-uv@bd01e18f51369d5a26f1651c3cb451d3417e3bba # v6.3.1
+        uses: astral-sh/setup-uv@7edac99f961f18b581bbd960d59d049f04c0002f # v6.4.1
 
       - name: Run zizmor 🌈
         run: uvx zizmor --format sarif . > results.sarif 

docs/docs/CHANGELOG.md

@@ -12,8 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 <!-- This changes the project to: -->
-- Expired records are now properly removed from bbolt databases ([#848](https://github.com/TecharoHQ/anubis/pull/848)).
 
+- 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
@@ -22,6 +22,14 @@ Anubis now supports these new languages:
 
 - [Czech](https://github.com/TecharoHQ/anubis/pull/849)
 
+Anubis now supports the [`missingHeader`](./admin/configuration/expressions.mdx#missingHeader) to assert the absence of headers in requests.
+
+### Fixes
+
+#### Fix potential memory leak when discovering a solution
+
+In some cases, the parallel solution finder in Anubis could cause all of the worker promises to leak due to the fact the promises were being improperly terminated. This was fixed by having Anubis debounce worker termination instead of allowing it to potentially recurse infinitely.
+
 ## v1.21.0: Minfilia Warde
 
 > Please, be at ease. You are among friends here.

docs/docs/admin/configuration/expressions.mdx

@@ -77,7 +77,7 @@ For example, consider this rule:
 
 For this rule, if a request comes in from `8.8.8.8` or `1.1.1.1`, Anubis will deny the request and return an error page.
 
-#### `all` blocks
+### `all` blocks
 
 An `all` block that contains a list of expressions. If all expressions in the list return `true`, then the action specified in the rule will be taken. If any of the expressions in the list returns `false`, Anubis will move on to the next rule.
 
@@ -186,8 +186,32 @@ Also keep in mind that this does not account for other kinds of latency like I/O
 
 Anubis expressions can be augmented with the following functions:
 
+### `missingHeader`
+
+Available in `bot` expressions.
+
+```ts
+function missingHeader(headers: Record<string, string>, key: string) bool
+```
+
+`missingHeader` returns `true` if the request does not contain a header. This is useful when you are trying to assert behavior such as:
+
+```yaml
+# Adds weight to old versions of Chrome
+- name: old-chrome
+  action: WEIGH
+  weight:
+    adjust: 10
+  expression:
+    all:
+      - userAgent.matches("Chrome/[1-9][0-9]?\\.0\\.0\\.0")
+      - missingHeader(headers, "Sec-Ch-Ua")
+```
+
 ### `randInt`
 
+Available in all expressions.
+
 ```ts
 function randInt(n: int): int;
 ```

lib/localization/locales/fil.json

@@ -45,8 +45,7 @@
   "celphase": "CELPHASE",
   "js_web_crypto_error": "Ang iyong browser ay walang gumaganang web.crypto element. Tinitingnan mo ba ito sa isang secure na konteksto?",
   "js_web_workers_error": "Hindi sinusuportahan ng iyong browser ang mga web worker (ginagamit ito ng Anubis upang maiwasan ang pag-freeze ng iyong browser). Mayroon ka bang naka-install na plugin tulad ng JShelter?",
-  "js_cookies_error": "Your browser doesn't store cookies. Anubis uses cookies to determine which clients have passed challenges by storing a signed token in a cookie. Please enable storing cookies for this domain. The names of the cookies Anubis stores may vary w",
-  "js_cookies_error": "Ang iyong browser ay hindi nag-iimbak ng cookies. Gumagamit ang Anubis ng cookies upang matukoy kung aling mga kliyente ang nakapasa sa mga hamon sa pamamagitan ng pag-iimbak ng isang nilagdaang token sa isang cookie. Mangyaring paganahin ang pag-iimbak ng cookies para sa domain na ito. Ang mga pangalan ng cookies na Anubis store ay maaaring mag-iba nang walang abiso. Ang mga pangalan at value ng cookie ay hindi bahagi ng pampublikong API.",
+  "js_cookies_error": "Ang iyong browser ay hindi nag-iimbak ng cookies. Gumagamit ang Anubis ng cookies upang matukoy kung aling mga kliyente ang nakapasa sa mga hamon sa pamamagitan ng pag-iimbak ng isang nilagdaang token sa isang cookie. Mangyaring paganahin ang pag-iimbak ng cookies para sa domain na ito. Ang mga pangalan ng cookies na iniimbak ng Anubis ay maaaring mag-iba nang walang abiso. Ang mga pangalan at value ng cookie ay hindi bahagi ng pampublikong API.",
   "js_context_not_secure": "Hindi secure ang iyong konteksto!",
   "js_context_not_secure_msg": "Subukang kumonekta sa pamamagitan ng HTTPS o sabihin sa admin na i-set up ang HTTPS. Para sa karagdagang impormasyon, tignan ang <a href=\"https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts#when_is_a_context_considered_secure\">MDN</a>.",
   "js_calculating": "Kinakalkula...",

lib/policy/expressions/environment.go

@@ -6,6 +6,7 @@ import (
 	"github.com/google/cel-go/cel"
 	"github.com/google/cel-go/common/types"
 	"github.com/google/cel-go/common/types/ref"
+	"github.com/google/cel-go/common/types/traits"
 	"github.com/google/cel-go/ext"
 )
 
@@ -26,6 +27,33 @@ func BotEnvironment() (*cel.Env, error) {
 		cel.Variable("load_1m", cel.DoubleType),
 		cel.Variable("load_5m", cel.DoubleType),
 		cel.Variable("load_15m", cel.DoubleType),
+
+		// Bot-specific functions:
+		cel.Function("missingHeader",
+			cel.Overload("missingHeader_map_string_string_string",
+				[]*cel.Type{cel.MapType(cel.StringType, cel.StringType), cel.StringType},
+				cel.BoolType,
+				cel.BinaryBinding(func(headers, key ref.Val) ref.Val {
+					// Convert headers to a trait that supports Find
+					headersMap, ok := headers.(traits.Indexer)
+					if !ok {
+						return types.ValOrErr(headers, "headers is not a map, but is %T", headers)
+					}
+
+					keyStr, ok := key.(types.String)
+					if !ok {
+						return types.ValOrErr(key, "key is not a string, but is %T", key)
+					}
+
+					val := headersMap.Get(keyStr)
+					// Check if the key is missing by testing for an error
+					if types.IsError(val) {
+						return types.Bool(true) // header is missing
+					}
+					return types.Bool(false) // header is present
+				}),
+			),
+		),
 	)
 }
 

lib/policy/expressions/environment_test.go

@@ -0,0 +1,269 @@
+package expressions
+
+import (
+	"testing"
+
+	"github.com/google/cel-go/common/types"
+)
+
+func TestBotEnvironment(t *testing.T) {
+	env, err := BotEnvironment()
+	if err != nil {
+		t.Fatalf("failed to create bot environment: %v", err)
+	}
+
+	tests := []struct {
+		name        string
+		expression  string
+		headers     map[string]string
+		expected    types.Bool
+		description string
+	}{
+		{
+			name:       "missing-header",
+			expression: `missingHeader(headers, "Missing-Header")`,
+			headers: map[string]string{
+				"User-Agent":   "test-agent",
+				"Content-Type": "application/json",
+			},
+			expected:    types.Bool(true),
+			description: "should return true when header is missing",
+		},
+		{
+			name:       "existing-header",
+			expression: `missingHeader(headers, "User-Agent")`,
+			headers: map[string]string{
+				"User-Agent":   "test-agent",
+				"Content-Type": "application/json",
+			},
+			expected:    types.Bool(false),
+			description: "should return false when header exists",
+		},
+		{
+			name:       "case-sensitive",
+			expression: `missingHeader(headers, "user-agent")`,
+			headers: map[string]string{
+				"User-Agent": "test-agent",
+			},
+			expected:    types.Bool(true),
+			description: "should be case-sensitive (user-agent != User-Agent)",
+		},
+		{
+			name:        "empty-headers",
+			expression:  `missingHeader(headers, "Any-Header")`,
+			headers:     map[string]string{},
+			expected:    types.Bool(true),
+			description: "should return true for any header when map is empty",
+		},
+		{
+			name:       "real-world-sec-ch-ua",
+			expression: `missingHeader(headers, "Sec-Ch-Ua")`,
+			headers: map[string]string{
+				"User-Agent": "curl/7.68.0",
+				"Accept":     "*/*",
+				"Host":       "example.com",
+			},
+			expected:    types.Bool(true),
+			description: "should detect missing browser-specific headers from bots",
+		},
+		{
+			name:       "browser-with-sec-ch-ua",
+			expression: `missingHeader(headers, "Sec-Ch-Ua")`,
+			headers: map[string]string{
+				"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
+				"Sec-Ch-Ua":  `"Chrome"; v="91", "Not A Brand"; v="99"`,
+				"Accept":     "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
+			},
+			expected:    types.Bool(false),
+			description: "should return false when browser sends Sec-Ch-Ua header",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			prog, err := Compile(env, tt.expression)
+			if err != nil {
+				t.Fatalf("failed to compile expression %q: %v", tt.expression, err)
+			}
+
+			result, _, err := prog.Eval(map[string]interface{}{
+				"headers": tt.headers,
+			})
+			if err != nil {
+				t.Fatalf("failed to evaluate expression %q: %v", tt.expression, err)
+			}
+
+			if result != tt.expected {
+				t.Errorf("%s: expected %v, got %v", tt.description, tt.expected, result)
+			}
+		})
+	}
+
+	t.Run("function-compilation", func(t *testing.T) {
+		src := `missingHeader(headers, "Test-Header")`
+		_, err := Compile(env, src)
+		if err != nil {
+			t.Fatalf("failed to compile missingHeader expression: %v", err)
+		}
+	})
+}
+
+func TestThresholdEnvironment(t *testing.T) {
+	env, err := ThresholdEnvironment()
+	if err != nil {
+		t.Fatalf("failed to create threshold environment: %v", err)
+	}
+
+	tests := []struct {
+		name          string
+		expression    string
+		variables     map[string]interface{}
+		expected      types.Bool
+		description   string
+		shouldCompile bool
+	}{
+		{
+			name:          "weight-variable-available",
+			expression:    `weight > 100`,
+			variables:     map[string]interface{}{"weight": 150},
+			expected:      types.Bool(true),
+			description:   "should support weight variable in expressions",
+			shouldCompile: true,
+		},
+		{
+			name:          "weight-variable-false-case",
+			expression:    `weight > 100`,
+			variables:     map[string]interface{}{"weight": 50},
+			expected:      types.Bool(false),
+			description:   "should correctly evaluate weight comparisons",
+			shouldCompile: true,
+		},
+		{
+			name:          "missingHeader-not-available",
+			expression:    `missingHeader(headers, "Test")`,
+			variables:     map[string]interface{}{},
+			expected:      types.Bool(false), // not used
+			description:   "should not have missingHeader function available",
+			shouldCompile: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			prog, err := Compile(env, tt.expression)
+
+			if !tt.shouldCompile {
+				if err == nil {
+					t.Fatalf("%s: expected compilation to fail but it succeeded", tt.description)
+				}
+				return // Test passed - compilation failed as expected
+			}
+
+			if err != nil {
+				t.Fatalf("failed to compile expression %q: %v", tt.expression, err)
+			}
+
+			result, _, err := prog.Eval(tt.variables)
+			if err != nil {
+				t.Fatalf("failed to evaluate expression %q: %v", tt.expression, err)
+			}
+
+			if result != tt.expected {
+				t.Errorf("%s: expected %v, got %v", tt.description, tt.expected, result)
+			}
+		})
+	}
+}
+
+func TestNewEnvironment(t *testing.T) {
+	env, err := New()
+	if err != nil {
+		t.Fatalf("failed to create new environment: %v", err)
+	}
+
+	tests := []struct {
+		name          string
+		expression    string
+		variables     map[string]interface{}
+		expectBool    *bool // nil if we just want to test compilation or non-bool result
+		description   string
+		shouldCompile bool
+	}{
+		{
+			name:          "randInt-function-compilation",
+			expression:    `randInt(10)`,
+			variables:     map[string]interface{}{},
+			expectBool:    nil, // Don't check result, just compilation
+			description:   "should compile randInt function",
+			shouldCompile: true,
+		},
+		{
+			name:          "randInt-range-validation",
+			expression:    `randInt(10) >= 0 && randInt(10) < 10`,
+			variables:     map[string]interface{}{},
+			expectBool:    boolPtr(true),
+			description:   "should return values in correct range",
+			shouldCompile: true,
+		},
+		{
+			name:          "strings-extension-size",
+			expression:    `"hello".size() == 5`,
+			variables:     map[string]interface{}{},
+			expectBool:    boolPtr(true),
+			description:   "should support string extension functions",
+			shouldCompile: true,
+		},
+		{
+			name:          "strings-extension-contains",
+			expression:    `"hello world".contains("world")`,
+			variables:     map[string]interface{}{},
+			expectBool:    boolPtr(true),
+			description:   "should support string contains function",
+			shouldCompile: true,
+		},
+		{
+			name:          "strings-extension-startsWith",
+			expression:    `"hello world".startsWith("hello")`,
+			variables:     map[string]interface{}{},
+			expectBool:    boolPtr(true),
+			description:   "should support string startsWith function",
+			shouldCompile: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			prog, err := Compile(env, tt.expression)
+
+			if !tt.shouldCompile {
+				if err == nil {
+					t.Fatalf("%s: expected compilation to fail but it succeeded", tt.description)
+				}
+				return // Test passed - compilation failed as expected
+			}
+
+			if err != nil {
+				t.Fatalf("failed to compile expression %q: %v", tt.expression, err)
+			}
+
+			// If we only want to test compilation, skip evaluation
+			if tt.expectBool == nil {
+				return
+			}
+
+			result, _, err := prog.Eval(tt.variables)
+			if err != nil {
+				t.Fatalf("failed to evaluate expression %q: %v", tt.expression, err)
+			}
+
+			if result != types.Bool(*tt.expectBool) {
+				t.Errorf("%s: expected %v, got %v", tt.description, *tt.expectBool, result)
+			}
+		})
+	}
+}
+
+// Helper function to create bool pointers
+func boolPtr(b bool) *bool {
+	return &b
+}

package-lock.json

@@ -9,9 +9,9 @@
       "version": "1.21.0",
       "license": "ISC",
       "devDependencies": {
-        "cssnano": "^7.0.7",
-        "cssnano-preset-advanced": "^7.0.7",
-        "esbuild": "^0.25.6",
+        "cssnano": "^7.1.0",
+        "cssnano-preset-advanced": "^7.0.8",
+        "esbuild": "^0.25.8",
         "playwright": "^1.52.0",
         "postcss-cli": "^11.0.1",
         "postcss-import": "^16.1.1",
@@ -20,9 +20,9 @@
       }
     },
     "node_modules/@esbuild/aix-ppc64": {
-      "version": "0.25.6",
-      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.6.tgz",
-      "integrity": "sha512-ShbM/3XxwuxjFiuVBHA+d3j5dyac0aEVVq1oluIDf71hUw0aRF59dV/efUsIwFnR6m8JNM2FjZOzmaZ8yG61kw==",
+      "version": "0.25.8",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.8.tgz",
+      "integrity": "sha512-urAvrUedIqEiFR3FYSLTWQgLu5tb+m0qZw0NBEasUeo6wuqatkMDaRT+1uABiGXEu5vqgPd7FGE1BhsAIy9QVA==",
       "cpu": [
         "ppc64"
       ],
@@ -37,9 +37,9 @@
       }
     },
     "node_modules/@esbuild/android-arm": {
-      "version": "0.25.6",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.25.6.tgz",
-      "integrity": "sha512-S8ToEOVfg++AU/bHwdksHNnyLyVM+eMVAOf6yRKFitnwnbwwPNqKr3srzFRe7nzV69RQKb5DgchIX5pt3L53xg==",
+      "version": "0.25.8",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.25.8.tgz",
+      "integrity": "sha512-RONsAvGCz5oWyePVnLdZY/HHwA++nxYWIX1atInlaW6SEkwq6XkP3+cb825EUcRs5Vss/lGh/2YxAb5xqc07Uw==",
       "cpu": [
         "arm"
       ],
@@ -54,9 +54,9 @@
       }
     },
     "node_modules/@esbuild/android-arm64": {
-      "version": "0.25.6",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.25.6.tgz",
-      "integrity": "sha512-hd5zdUarsK6strW+3Wxi5qWws+rJhCCbMiC9QZyzoxfk5uHRIE8T287giQxzVpEvCwuJ9Qjg6bEjcRJcgfLqoA==",
+      "version": "0.25.8",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.25.8.tgz",
+      "integrity": "sha512-OD3p7LYzWpLhZEyATcTSJ67qB5D+20vbtr6vHlHWSQYhKtzUYrETuWThmzFpZtFsBIxRvhO07+UgVA9m0i/O1w==",
       "cpu": [
         "arm64"
       ],
@@ -71,9 +71,9 @@
       }
     },
     "node_modules/@esbuild/android-x64": {
-      "version": "0.25.6",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.25.6.tgz",
-      "integrity": "sha512-0Z7KpHSr3VBIO9A/1wcT3NTy7EB4oNC4upJ5ye3R7taCc2GUdeynSLArnon5G8scPwaU866d3H4BCrE5xLW25A==",
+      "version": "0.25.8",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.25.8.tgz",
+      "integrity": "sha512-yJAVPklM5+4+9dTeKwHOaA+LQkmrKFX96BM0A/2zQrbS6ENCmxc4OVoBs5dPkCCak2roAD+jKCdnmOqKszPkjA==",
       "cpu": [
         "x64"
       ],
@@ -88,9 +88,9 @@
       }
     },
     "node_modules/@esbuild/darwin-arm64": {
-      "version": "0.25.6",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.25.6.tgz",
-      "integrity": "sha512-FFCssz3XBavjxcFxKsGy2DYK5VSvJqa6y5HXljKzhRZ87LvEi13brPrf/wdyl/BbpbMKJNOr1Sd0jtW4Ge1pAA==",
+      "version": "0.25.8",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.25.8.tgz",
+      "integrity": "sha512-Jw0mxgIaYX6R8ODrdkLLPwBqHTtYHJSmzzd+QeytSugzQ0Vg4c5rDky5VgkoowbZQahCbsv1rT1KW72MPIkevw==",
       "cpu": [
         "arm64"
       ],
@@ -105,9 +105,9 @@
       }
     },
     "node_modules/@esbuild/darwin-x64": {
-      "version": "0.25.6",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.25.6.tgz",
-      "integrity": "sha512-GfXs5kry/TkGM2vKqK2oyiLFygJRqKVhawu3+DOCk7OxLy/6jYkWXhlHwOoTb0WqGnWGAS7sooxbZowy+pK9Yg==",
+      "version": "0.25.8",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.25.8.tgz",
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+      "resolved": "https://registry.npmjs.org/svgo/-/svgo-4.0.0.tgz",
+      "integrity": "sha512-VvrHQ+9uniE+Mvx3+C9IEe/lWasXCU0nXMY2kZeLrHNICuRiC8uMPyM14UEaMOFA5mhyQqEkB02VoQ16n3DLaw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@trysound/sax": "0.2.0",
-        "commander": "^7.2.0",
+        "commander": "^11.1.0",
         "css-select": "^5.1.0",
-        "css-tree": "^2.3.1",
+        "css-tree": "^3.0.1",
         "css-what": "^6.1.0",
         "csso": "^5.0.5",
-        "picocolors": "^1.0.0"
+        "picocolors": "^1.1.1",
+        "sax": "^1.4.1"
       },
       "bin": {
-        "svgo": "bin/svgo"
+        "svgo": "bin/svgo.js"
       },
       "engines": {
-        "node": ">=14.0.0"
+        "node": ">=16"
       },
       "funding": {
         "type": "opencollective",

package.json

@@ -18,9 +18,9 @@
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "cssnano": "^7.0.7",
-    "cssnano-preset-advanced": "^7.0.7",
-    "esbuild": "^0.25.6",
+    "cssnano": "^7.1.0",
+    "cssnano-preset-advanced": "^7.0.8",
+    "esbuild": "^0.25.8",
     "playwright": "^1.52.0",
     "postcss-cli": "^11.0.1",
     "postcss-import": "^16.1.1",

web/js/proof-of-work-slow.mjs

@@ -14,32 +14,42 @@ export default function process(
     );
 
     let worker = new Worker(webWorkerURL);
-    const terminate = () => {
+    let settled = false;
+
+    const cleanup = () => {
+      if (settled) return;
+      settled = true;
       worker.terminate();
       if (signal != null) {
-        // clean up listener to avoid memory leak
-        signal.removeEventListener("abort", terminate);
-        if (signal.aborted) {
-          console.log("PoW aborted");
-          reject(false);
-        }
+        signal.removeEventListener("abort", onAbort);
       }
+      URL.revokeObjectURL(webWorkerURL);
     };
+
+    const onAbort = () => {
+      console.log("PoW aborted");
+      cleanup();
+      reject(new DOMException("Aborted", "AbortError"));
+    };
+
     if (signal != null) {
-      signal.addEventListener("abort", terminate, { once: true });
+      if (signal.aborted) {
+        return onAbort();
+      }
+      signal.addEventListener("abort", onAbort, { once: true });
     }
 
     worker.onmessage = (event) => {
       if (typeof event.data === "number") {
         progressCallback?.(event.data);
       } else {
-        terminate();
+        cleanup();
         resolve(event.data);
       }
     };
 
     worker.onerror = (event) => {
-      terminate();
+      cleanup();
       reject(event);
     };
 
@@ -47,8 +57,6 @@ export default function process(
       data,
       difficulty,
     });
-
-    URL.revokeObjectURL(webWorkerURL);
   });
 }
 

web/js/proof-of-work.mjs

@@ -12,19 +12,31 @@ export default function process(
     );
 
     const workers = [];
-    const terminate = () => {
+    let settled = false;
+
+    const cleanup = () => {
+      if (settled) {
+        return;
+      }
+      settled = true;
       workers.forEach((w) => w.terminate());
       if (signal != null) {
-        // clean up listener to avoid memory leak
-        signal.removeEventListener("abort", terminate);
-        if (signal.aborted) {
-          console.log("PoW aborted");
-          reject(false);
-        }
+        signal.removeEventListener("abort", onAbort);
       }
+      URL.revokeObjectURL(webWorkerURL);
     };
+
+    const onAbort = () => {
+      console.log("PoW aborted");
+      cleanup();
+      reject(new DOMException("Aborted", "AbortError"));
+    };
+
     if (signal != null) {
-      signal.addEventListener("abort", terminate, { once: true });
+      if (signal.aborted) {
+        return onAbort();
+      }
+      signal.addEventListener("abort", onAbort, { once: true });
     }
 
     for (let i = 0; i < threads; i++) {
@@ -34,13 +46,13 @@ export default function process(
         if (typeof event.data === "number") {
           progressCallback?.(event.data);
         } else {
-          terminate();
+          cleanup();
           resolve(event.data);
         }
       };
 
       worker.onerror = (event) => {
-        terminate();
+        cleanup();
         reject(event);
       };
 
@@ -53,8 +65,6 @@ export default function process(
 
       workers.push(worker);
     }
-
-    URL.revokeObjectURL(webWorkerURL);
   });
 }