/**
* Removes a tag from a contest
*
* @param Request $r
* @return array
* @throws InvalidDatabaseOperationException
* @throws ForbiddenAccessException
*/
public static function apiRemoveTag(Request $r)
{
// Authenticate logged user
self::authenticateRequest($r);
// Check whether problem exists
Validators::isStringNonEmpty($r['problem_alias'], 'problem_alias');
try {
$problem = ProblemsDAO::getByAlias($r['problem_alias']);
$tag = TagsDAO::getByName($r['name']);
} catch (Exception $e) {
// Operation failed in the data layer
throw new InvalidDatabaseOperationException($e);
}
if (is_null($problem)) {
throw new NotFoundException('problem');
} elseif (is_null($tag)) {
throw new NotFoundException('tag');
}
if (!Authorization::IsProblemAdmin($r['current_user_id'], $problem)) {
throw new ForbiddenAccessException();
}
$problem_tag = new ProblemsTags();
$problem_tag->problem_id = $problem->problem_id;
$problem_tag->tag_id = $tag->tag_id;
// Delete the role
try {
ProblemsTagsDAO::delete($problem_tag);
} catch (Exception $e) {
// Operation failed in the data layer
throw new InvalidDatabaseOperationException($e);
}
return array('status' => 'ok');
}
