#306

backend/app/services/material_sync_suppression_matcher.rb

@@ -16,7 +16,53 @@ class MaterialSyncSuppressionMatcher
     MaterialSyncSuppression.find_by(normalized_source_key: key)
   end
 
+  def self.match_google_drive_candidate drive_file_id:, relative_path:
+    normalized_path = validate_relative_path!(relative_path)
+
+    exact = [
+      normalize_key('google_drive_file', drive_file_id),
+      normalize_key('google_drive_path', normalized_path),
+      normalize_key('legacy_drive_path', normalized_path),
+    ].compact
+
+    suppression =
+        MaterialSyncSuppression.find_by(normalized_source_key: exact)
+    return suppression if suppression
+
+    MaterialSyncSuppression
+      .where(source_kind: ['google_drive_path_prefix', 'legacy_drive_path_prefix'])
+      .where('drive_path = :path OR :path LIKE CONCAT(drive_path, "/%")', path: normalized_path)
+      .order(:id)
+      .first
+  end
+
   def self.suppressed?(...)
     match(...).present?
   end
+
+  def self.validate_relative_path! relative_path
+    raw = relative_path.to_s.delete("\0").tr('\\', '/').strip
+    raise ArgumentError, 'relative_path is required' if raw.blank?
+    raise ArgumentError, 'relative_path must be relative' if raw.start_with?('/')
+    raise ArgumentError, 'relative_path must be relative' if raw.match?(/\A[A-Za-z]:\//)
+    if raw.start_with?('My Drive/', 'マイドライブ/')
+      raise ArgumentError, 'relative_path must be relative to source folder'
+    end
+    raise ArgumentError, 'relative_path must not contain //' if raw.include?('//')
+    raise ArgumentError, 'relative_path must not end with /' if raw.end_with?('/')
+
+    parts = raw.split('/')
+    if parts.any? { |part| part.in?(['.', '..']) }
+      raise ArgumentError, 'relative_path must not contain dot segments'
+    end
+
+    raw
+  end
+
+  def self.normalize_key source_kind, value
+    return nil if value.blank?
+
+    MaterialSyncSuppression.normalize_source_key(source_kind:, source_path: value,
+                                                 source_file_id: value)
+  end
 end