Add global block and keep filters

internal/validator/user.go

@@ -4,6 +4,9 @@
 package validator // import "miniflux.app/v2/internal/validator"
 
 import (
+	"slices"
+	"strings"
+
 	"miniflux.app/v2/internal/locale"
 	"miniflux.app/v2/internal/model"
 	"miniflux.app/v2/internal/storage"
@@ -108,6 +111,18 @@ func ValidateUserModification(store *storage.Storage, userID int64, changes *mod
 		}
 	}
 
+	if changes.BlockFilterEntryRules != nil {
+		if err := isValidFilterRules(*changes.BlockFilterEntryRules, "block"); err != nil {
+			return err
+		}
+	}
+
+	if changes.KeepFilterEntryRules != nil {
+		if err := isValidFilterRules(*changes.KeepFilterEntryRules, "keep"); err != nil {
+			return err
+		}
+	}
+
 	return nil
 }
 
@@ -195,3 +210,35 @@ func validateMediaPlaybackRate(mediaPlaybackRate float64) *locale.LocalizedError
 	}
 	return nil
 }
+
+func isValidFilterRules(filterEntryRules string, filterType string) *locale.LocalizedError {
+	// Valid Format: FieldName(RegEx)~FieldName(RegEx)~...
+	fieldNames := []string{"EntryTitle", "EntryURL", "EntryCommentsURL", "EntryContent", "EntryAuthor", "EntryTag"}
+
+	rules := strings.Split(filterEntryRules, "\n")
+	for i, rule := range rules {
+		// Check if rule starts with a valid fieldName
+		idx := slices.IndexFunc(fieldNames, func(fieldName string) bool { return strings.HasPrefix(rule, fieldName) })
+		if idx == -1 {
+			return locale.NewLocalizedError("error.settings_"+filterType+"_rule_fieldname_invalid", i+1, "'"+strings.Join(fieldNames, "', '")+"'")
+		}
+		fieldName := fieldNames[idx]
+		fieldRegEx, _ := strings.CutPrefix(rule, fieldName)
+
+		// Check if regex begins with a =
+		if !strings.HasPrefix(fieldRegEx, "=") {
+			return locale.NewLocalizedError("error.settings_"+filterType+"_rule_separator_required", i+1)
+		}
+		fieldRegEx = strings.TrimPrefix(fieldRegEx, "=")
+
+		if fieldRegEx == "" {
+			return locale.NewLocalizedError("error.settings_"+filterType+"_rule_regex_required", i+1)
+		}
+
+		// Check if provided pattern is a valid RegEx
+		if !IsValidRegex(fieldRegEx) {
+			return locale.NewLocalizedError("error.settings_"+filterType+"_rule_invalid_regex", i+1)
+		}
+	}
+	return nil
+}