refactor: use new checker types

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

lib/checker/headermatches/checker.go

@@ -1,8 +1,12 @@
 package headermatches
 
 import (
+	"context"
+	"encoding/json"
 	"net/http"
 	"regexp"
+
+	"github.com/TecharoHQ/anubis/lib/checker"
 )
 
 type Checker struct {
@@ -22,3 +26,21 @@ func (c *Checker) Check(r *http.Request) (bool, error) {
 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))
+}