feat(checker): port path checker

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

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()
+}