Now chats are backuped too !! :-)

diff --git a/mod/chat/backuplib.php b/mod/chat/backuplib.php
new file mode 100644 (file)
index 0000000..12d5593
--- /dev/null
+++ b/mod/chat/backuplib.php
@@ -0,0 +1,139 @@
+<?PHP //$Id$
+    //This php script contains all the stuff to backup/restore
+    //chat mods
+
+    //This is the "graphical" structure of the chat mod:
+    //
+    //                       chat
+    //                    (CL,pk->id)             
+    //                        |
+    //                        |
+    //                        |
+    //                   chat_messages 
+    //               (UL,pk->id, fk->chatid)
+    //
+    // Meaning: pk->primary key field of the table
+    //          fk->foreign key to link with parent
+    //          nt->nested field (recursive data)
+    //          CL->course level info
+    //          UL->user level info
+    //          files->table may have files)
+    //
+    //-----------------------------------------------------------
+
+    //This function executes all the backup procedure about this mod
+    function chat_backup_mods($bf,$preferences) {
+
+        global $CFG;
+
+        $status = true;
+
+        //Iterate over chat table
+        $chats = get_records ("chat","course",$preferences->backup_course,"id");
+        if ($chats) {
+            foreach ($chats as $chat) {
+                //Start mod
+                fwrite ($bf,start_tag("MOD",3,true));
+                //Print chat data
+                fwrite ($bf,full_tag("ID",4,false,$chat->id));
+                fwrite ($bf,full_tag("MODTYPE",4,false,"chat"));
+                fwrite ($bf,full_tag("NAME",4,false,$chat->name));
+                fwrite ($bf,full_tag("INTRO",4,false,$chat->intro));
+                fwrite ($bf,full_tag("KEEPDAYS",4,false,$chat->keepdays));
+                fwrite ($bf,full_tag("STUDENTLOGS",4,false,$chat->studentlogs));
+                fwrite ($bf,full_tag("SCHEDULE",4,false,$chat->schedule));
+                fwrite ($bf,full_tag("CHATTIME",4,false,$chat->chattime));
+                fwrite ($bf,full_tag("TIMEMODIFIED",4,false,$chat->timemodified));
+                //if we've selected to backup users info, then execute backup_chat_messages
+                if ($preferences->mods["chat"]->userinfo) {
+                    $status = backup_chat_messages($bf,$preferences,$chat->id);
+                }
+                //End mod
+                $status =fwrite ($bf,end_tag("MOD",3,true));
+            }
+        }
+        return $status;  
+    }
+
+    //Backup chat_messages contents (executed from chat_backup_mods)
+    function backup_chat_messages ($bf,$preferences,$chat) {
+
+        global $CFG;
+
+        $status = true;
+
+        $chat_messages = get_records("chat_messages","chatid",$chat,"id");
+        //If there is messages
+        if ($chat_messages) {
+            //Write start tag
+            $status =fwrite ($bf,start_tag("MESSAGES",4,true));
+            //Iterate over each message
+            foreach ($chat_messages as $cha_mes) {
+                //Start message
+                $status =fwrite ($bf,start_tag("MESSAGE",5,true));
+                //Print message contents
+                fwrite ($bf,full_tag("ID",6,false,$cha_mes->id));       
+                fwrite ($bf,full_tag("USERID",6,false,$cha_mes->userid));       
+                fwrite ($bf,full_tag("SYSTEM",6,false,$cha_mes->system));       
+                fwrite ($bf,full_tag("MESSAGE_TEXT",6,false,$cha_mes->message));       
+                fwrite ($bf,full_tag("TIMESTAMP",6,false,$cha_mes->timestamp));       
+                //End submission
+                $status =fwrite ($bf,end_tag("MESSAGE",5,true));
+            }
+            //Write end tag
+            $status =fwrite ($bf,end_tag("MESSAGES",4,true));
+        }
+        return $status;
+    }
+
+    //Return an array of info (name,value)
+    function chat_check_backup_mods($course,$user_data=false,$backup_unique_code) {
+        //First the course data
+        $info[0][0] = get_string("modulenameplural","chat");
+        if ($ids = chat_ids ($course)) {
+            $info[0][1] = count($ids);
+        } else {
+            $info[0][1] = 0;
+        }
+
+        //Now, if requested, the user_data
+        if ($user_data) {
+            $info[1][0] = get_string("messages","chat");
+            if ($ids = chat_message_ids_by_course ($course)) { 
+                $info[1][1] = count($ids);
+            } else {
+                $info[1][1] = 0;
+            }
+        }
+        return $info;
+    }
+
+
+
+
+
+
+    // INTERNAL FUNCTIONS. BASED IN THE MOD STRUCTURE
+
+    //Returns an array of chats id 
+    function chat_ids ($course) {
+
+        global $CFG;
+
+        return get_records_sql ("SELECT c.id, c.course
+                                 FROM {$CFG->prefix}chat c
+                                 WHERE c.course = '$course'");
+    }
+    
+    //Returns an array of assignment_submissions id
+    function chat_message_ids_by_course ($course) {
+
+        global $CFG;
+
+        return get_records_sql ("SELECT m.id , m.chatid
+                                 FROM {$CFG->prefix}chat_messages m,
+                                      {$CFG->prefix}chat c
+                                 WHERE c.course = '$course' AND
+                                       m.chatid = c.id");
+    }
+?>