fix(backend): match GitLab topics case-insensitively

CHANGELOG.md

@@ -32,6 +32,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Upgraded `nodemailer` to `^9.0.1`. [#1356](https://github.com/sourcebot-dev/sourcebot/pull/1356)
 - Upgraded `@opentelemetry/core` to `^2.8.0`. [#1413](https://github.com/sourcebot-dev/sourcebot/pull/1413)
 - [EE] Fixed connector setup dialogs to add scrolling when connector setup content goes out of view.
+- Fixed GitLab topic include and exclude filters missing mixed-case project topics. [#1393](https://github.com/sourcebot-dev/sourcebot/pull/1393)
 
 ## [5.0.4] - 2026-06-18
 

packages/backend/src/gitlab.test.ts

@@ -117,6 +117,18 @@ test('shouldExcludeProject returns false when include.topics matches via glob pa
     })).toBe(false);
 });
 
+test('shouldExcludeProject matches include.topics glob patterns case-insensitively.', () => {
+    const project = {
+        path_with_namespace: 'test/project',
+        topics: ['Core-API'],
+    } as unknown as ProjectSchema;
+
+    expect(shouldExcludeProject({
+        project,
+        include: { topics: ['core-*'] },
+    })).toBe(false);
+});
+
 test('shouldExcludeProject returns true when exclude.topics matches a project topic.', () => {
     const project = {
         path_with_namespace: 'test/project',
@@ -141,16 +153,26 @@ test('shouldExcludeProject returns false when exclude.topics does not match any
     })).toBe(false);
 });
 
-test('shouldExcludeProject include.topics matching is case-sensitive on the project side.', () => {
+test('shouldExcludeProject matches include.topics case-insensitively.', () => {
     const project = {
         path_with_namespace: 'test/project',
         topics: ['Backend'],
     } as unknown as ProjectSchema;
 
-    // The function lowercases config topics but not project topics,
-    // so 'Backend' does not match the lowercased pattern 'backend'.
     expect(shouldExcludeProject({
         project,
         include: { topics: ['backend'] },
+    })).toBe(false);
+});
+
+test('shouldExcludeProject matches exclude.topics case-insensitively.', () => {
+    const project = {
+        path_with_namespace: 'test/project',
+        topics: ['Deprecated'],
+    } as unknown as ProjectSchema;
+
+    expect(shouldExcludeProject({
+        project,
+        exclude: { topics: ['deprecated'] },
     })).toBe(true);
 });

packages/backend/src/gitlab.ts

@@ -249,7 +249,7 @@ export const shouldExcludeProject = ({
 
         if (include?.topics) {
             const configTopics = include.topics.map(topic => topic.toLowerCase());
-            const projectTopics = project.topics ?? [];
+            const projectTopics = (project.topics ?? []).map(topic => topic.toLowerCase());
 
             const matchingTopics = projectTopics.filter((topic) => micromatch.isMatch(topic, configTopics));
             if (matchingTopics.length === 0) {
@@ -260,7 +260,7 @@ export const shouldExcludeProject = ({
 
         if (exclude?.topics) {
             const configTopics = exclude.topics.map(topic => topic.toLowerCase());
-            const projectTopics = project.topics ?? [];
+            const projectTopics = (project.topics ?? []).map(topic => topic.toLowerCase());
 
             const matchingTopics = projectTopics.filter((topic) => micromatch.isMatch(topic, configTopics));
             if (matchingTopics.length > 0) {
@@ -333,4 +333,4 @@ export const getOAuthScopesForAuthenticatedUser = async (api: InstanceType<typeo
         logger.error('Failed to fetch OAuth scopes for authenticated user.', error);
         throw error;
     }
-}
+}