From a3c315dda2a0adbc877a35a93f3bd686f5c7884c Mon Sep 17 00:00:00 2001
From: Juan Leyva <juanleyvadelgado@gmail.com>
Date: Tue, 31 Mar 2015 12:25:10 +0200
Subject: [PATCH] MDL-49503 forum: New external function
 mod_forum_view_forum_discussion

---
 mod/forum/externallib.php | 64 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/mod/forum/externallib.php b/mod/forum/externallib.php
index b275d027c7c..6f2823a346f 100644
--- a/mod/forum/externallib.php
+++ b/mod/forum/externallib.php
@@ -872,4 +872,68 @@ class mod_forum_external extends external_api {
         );
     }
 
+    /**
+     * Returns description of method parameters
+     *
+     * @return external_function_parameters
+     * @since Moodle 2.9
+     */
+    public static function view_forum_discussion_parameters() {
+        return new external_function_parameters(
+            array(
+                'discussionid' => new external_value(PARAM_INT, 'discussion id')
+            )
+        );
+    }
+
+    /**
+     * Simulate the forum/discuss.php web interface page: trigger events
+     *
+     * @param int $discussionid the discussion id
+     * @return array of warnings and status result
+     * @since Moodle 2.9
+     * @throws moodle_exception
+     */
+    public static function view_forum_discussion($discussionid) {
+        global $DB, $CFG;
+        require_once($CFG->dirroot . "/mod/forum/lib.php");
+
+        $params = self::validate_parameters(self::view_forum_discussion_parameters(),
+                                            array(
+                                                'discussionid' => $discussionid
+                                            ));
+        $warnings = array();
+
+        $discussion = $DB->get_record('forum_discussions', array('id' => $params['discussionid']), '*', MUST_EXIST);
+        $forum = $DB->get_record('forum', array('id' => $discussion->forum), '*', MUST_EXIST);
+        list($course, $cm) = get_course_and_cm_from_instance($forum, 'forum');
+
+        // Validate the module context. It checks everything that affects the module visibility (including groupings, etc..).
+        $modcontext = context_module::instance($cm->id);
+        self::validate_context($modcontext);
+
+        // Call the forum/lib API.
+        forum_discussion_view($modcontext, $forum, $discussion);
+
+        $result = array();
+        $result['status'] = true;
+        $result['warnings'] = $warnings;
+        return $result;
+    }
+
+    /**
+     * Returns description of method result value
+     *
+     * @return external_description
+     * @since Moodle 2.9
+     */
+    public static function view_forum_discussion_returns() {
+        return new external_single_structure(
+            array(
+                'status' => new external_value(PARAM_BOOL, 'status: true if success'),
+                'warnings' => new external_warnings()
+            )
+        );
+    }
+
 }