Added filter class for tags

app/Filter/TaskTagFilter.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace Kanboard\Filter;
+
+use Kanboard\Core\Filter\FilterInterface;
+use Kanboard\Model\TagModel;
+use Kanboard\Model\TaskModel;
+use Kanboard\Model\TaskTagModel;
+use PicoDb\Database;
+
+/**
+ * Class TaskTagFilter
+ *
+ * @package Kanboard\Filter
+ * @author  Frederic Guillot
+ */
+class TaskTagFilter extends BaseFilter implements FilterInterface
+{
+    /**
+     * Database object
+     *
+     * @access private
+     * @var Database
+     */
+    private $db;
+
+    /**
+     * Get search attribute
+     *
+     * @access public
+     * @return string[]
+     */
+    public function getAttributes()
+    {
+        return array('tag');
+    }
+
+    /**
+     * Set database object
+     *
+     * @access public
+     * @param  Database $db
+     * @return $this
+     */
+    public function setDatabase(Database $db)
+    {
+        $this->db = $db;
+        return $this;
+    }
+
+    /**
+     * Apply filter
+     *
+     * @access public
+     * @return FilterInterface
+     */
+    public function apply()
+    {
+        $task_ids = $this->db
+            ->table(TagModel::TABLE)
+            ->ilike(TagModel::TABLE.'.name', $this->value)
+            ->asc(TagModel::TABLE.'.project_id')
+            ->join(TaskTagModel::TABLE, 'tag_id', 'id')
+            ->findAllByColumn(TaskTagModel::TABLE.'.task_id');
+
+        if (empty($task_ids)) {
+            $task_ids = array(-1);
+        }
+
+        $this->query->in(TaskModel::TABLE.'.id', $task_ids);
+
+        return $this;
+    }
+}

app/Model/TaskTagModel.php

@@ -74,9 +74,9 @@ class TaskTagModel extends Base
      * Add or update a list of tags to a task
      *
      * @access public
-     * @param integer  $project_id
-     * @param integer  $task_id
-     * @param string[] $tags
+     * @param  integer  $project_id
+     * @param  integer  $task_id
+     * @param  string[] $tags
      * @return boolean
      */
     public function save($project_id, $task_id, array $tags)
@@ -123,10 +123,10 @@ class TaskTagModel extends Base
      * Associate missing tags
      *
      * @access protected
-     * @param  integer $project_id
-     * @param  integer $task_id
-     * @param  array   $task_tags
-     * @param  array   $tags
+     * @param  integer  $project_id
+     * @param  integer  $task_id
+     * @param  array    $task_tags
+     * @param  string[] $tags
      * @return bool
      */
     protected function associateTags($project_id, $task_id, $task_tags, $tags)
@@ -146,9 +146,9 @@ class TaskTagModel extends Base
      * Dissociate removed tags
      *
      * @access protected
-     * @param  integer $task_id
-     * @param  array $task_tags
-     * @param  array $tags
+     * @param  integer  $task_id
+     * @param  array    $task_tags
+     * @param  string[] $tags
      * @return bool
      */
     protected function dissociateTags($task_id, $task_tags, $tags)

app/ServiceProvider/FilterProvider.php

@@ -26,6 +26,7 @@ use Kanboard\Filter\TaskReferenceFilter;
 use Kanboard\Filter\TaskStatusFilter;
 use Kanboard\Filter\TaskSubtaskAssigneeFilter;
 use Kanboard\Filter\TaskSwimlaneFilter;
+use Kanboard\Filter\TaskTagFilter;
 use Kanboard\Filter\TaskTitleFilter;
 use Kanboard\Model\ProjectModel;
 use Kanboard\Model\ProjectGroupRoleModel;
@@ -163,6 +164,9 @@ class FilterProvider implements ServiceProviderInterface
                     ->setDatabase($c['db'])
                 )
                 ->withFilter(new TaskSwimlaneFilter())
+                ->withFilter(TaskTagFilter::getInstance()
+                    ->setDatabase($c['db'])
+                )
                 ->withFilter(new TaskTitleFilter(), true)
             ;