feat: Improve the contributors admin UX/UI

apps/api/src/services/courses/contributors.py

@@ -173,4 +173,200 @@ async def get_course_contributors(
             "user": UserRead.model_validate(user).model_dump()
         }
         for contributor, user in results
-    ] 
+    ]
+
+async def add_bulk_course_contributors(
+    request: Request,
+    course_uuid: str,
+    usernames: List[str],
+    current_user: PublicUser | AnonymousUser,
+    db_session: Session,
+):
+    """
+    Add multiple contributors to a course by their usernames
+    Only administrators can perform this action
+    """
+    # Verify user is not anonymous
+    await authorization_verify_if_user_is_anon(current_user.id)
+
+    # RBAC check - verify if user has admin rights
+    authorized = await authorization_verify_based_on_roles_and_authorship(
+        request, current_user.id, "update", course_uuid, db_session
+    )
+
+    if not authorized:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="You are not authorized to add contributors",
+        )
+
+    # Check if course exists
+    statement = select(Course).where(Course.course_uuid == course_uuid)
+    course = db_session.exec(statement).first()
+
+    if not course:
+        raise HTTPException(
+            status_code=404,
+            detail="Course not found",
+        )
+
+    # Process results
+    results = {
+        "successful": [],
+        "failed": []
+    }
+    
+    current_time = str(datetime.now())
+
+    for username in usernames:
+        try:
+            # Find user by username
+            user_statement = select(User).where(User.username == username)
+            user = db_session.exec(user_statement).first()
+
+            if not user or user.id is None:
+                results["failed"].append({
+                    "username": username,
+                    "reason": "User not found or invalid"
+                })
+                continue
+
+            # Check if user already has any authorship role for this course
+            existing_authorship = db_session.exec(
+                select(ResourceAuthor).where(
+                    and_(
+                        ResourceAuthor.resource_uuid == course_uuid,
+                        ResourceAuthor.user_id == user.id
+                    )
+                )
+            ).first()
+
+            if existing_authorship:
+                results["failed"].append({
+                    "username": username,
+                    "reason": "User already has an authorship role for this course"
+                })
+                continue
+
+            # Create contributor
+            resource_author = ResourceAuthor(
+                resource_uuid=course_uuid,
+                user_id=user.id,
+                authorship=ResourceAuthorshipEnum.CONTRIBUTOR,
+                authorship_status=ResourceAuthorshipStatusEnum.PENDING,
+                creation_date=current_time,
+                update_date=current_time,
+            )
+
+            db_session.add(resource_author)
+            db_session.commit()
+            db_session.refresh(resource_author)
+
+            results["successful"].append({
+                "username": username,
+                "user_id": user.id
+            })
+
+        except Exception as e:
+            results["failed"].append({
+                "username": username,
+                "reason": str(e)
+            })
+            
+    return results 
+
+async def remove_bulk_course_contributors(
+    request: Request,
+    course_uuid: str,
+    usernames: List[str],
+    current_user: PublicUser | AnonymousUser,
+    db_session: Session,
+):
+    """
+    Remove multiple contributors from a course by their usernames
+    Only administrators can perform this action
+    """
+    # Verify user is not anonymous
+    await authorization_verify_if_user_is_anon(current_user.id)
+
+    # RBAC check - verify if user has admin rights
+    authorized = await authorization_verify_based_on_roles_and_authorship(
+        request, current_user.id, "update", course_uuid, db_session
+    )
+
+    if not authorized:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="You are not authorized to remove contributors",
+        )
+
+    # Check if course exists
+    statement = select(Course).where(Course.course_uuid == course_uuid)
+    course = db_session.exec(statement).first()
+
+    if not course:
+        raise HTTPException(
+            status_code=404,
+            detail="Course not found",
+        )
+
+    # Process results
+    results = {
+        "successful": [],
+        "failed": []
+    }
+
+    for username in usernames:
+        try:
+            # Find user by username
+            user_statement = select(User).where(User.username == username)
+            user = db_session.exec(user_statement).first()
+
+            if not user or user.id is None:
+                results["failed"].append({
+                    "username": username,
+                    "reason": "User not found or invalid"
+                })
+                continue
+
+            # Check if user has any authorship role for this course
+            existing_authorship = db_session.exec(
+                select(ResourceAuthor).where(
+                    and_(
+                        ResourceAuthor.resource_uuid == course_uuid,
+                        ResourceAuthor.user_id == user.id
+                    )
+                )
+            ).first()
+
+            if not existing_authorship:
+                results["failed"].append({
+                    "username": username,
+                    "reason": "User is not a contributor for this course"
+                })
+                continue
+
+            # Don't allow removing the creator
+            if existing_authorship.authorship == ResourceAuthorshipEnum.CREATOR:
+                results["failed"].append({
+                    "username": username,
+                    "reason": "Cannot remove the course creator"
+                })
+                continue
+
+            # Remove the contributor
+            db_session.delete(existing_authorship)
+            db_session.commit()
+
+            results["successful"].append({
+                "username": username,
+                "user_id": user.id
+            })
+
+        except Exception as e:
+            results["failed"].append({
+                "username": username,
+                "reason": str(e)
+            })
+            
+    return results