fix(gateway): filter projects by ownership — close data privacy leak (#202)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/brain/src/projects.ts

@@ -1,4 +1,4 @@
-import { eq, type Db, projects } from '@mosaic/db';
+import { eq, or, inArray, type Db, projects, teamMembers } from '@mosaic/db';
 
 export type Project = typeof projects.$inferSelect;
 export type NewProject = typeof projects.$inferInsert;
@@ -9,6 +9,31 @@ export function createProjectsRepo(db: Db) {
       return db.select().from(projects);
     },
 
+    /**
+     * Return only the projects visible to a given user:
+     *   – projects directly owned by the user (ownerType = 'user', ownerId = userId), OR
+     *   – projects owned by a team the user belongs to (ownerType = 'team', teamId IN user's teams)
+     */
+    async findAllForUser(userId: string): Promise<Project[]> {
+      // Fetch the team IDs the user is a member of.
+      const memberRows = await db
+        .select({ teamId: teamMembers.teamId })
+        .from(teamMembers)
+        .where(eq(teamMembers.userId, userId));
+
+      const teamIds = memberRows.map((r) => r.teamId);
+
+      if (teamIds.length === 0) {
+        // No team memberships — return only directly owned projects.
+        return db.select().from(projects).where(eq(projects.ownerId, userId));
+      }
+
+      return db
+        .select()
+        .from(projects)
+        .where(or(eq(projects.ownerId, userId), inArray(projects.teamId, teamIds)));
+    },
+
     async findById(id: string): Promise<Project | undefined> {
       const rows = await db.select().from(projects).where(eq(projects.id, id));
       return rows[0];