Incorporating regex filter

Might as well merge all the pull's!

Props to @ramonfincken for the original

Author: clonemeagain

README.md

@@ -45,4 +45,8 @@ When a user replies, you'll get something like:
 
 ![slack-reply](https://user-images.githubusercontent.com/5077391/31572648-9279eb18-b0f6-11e7-97da-9a9c63a200d4.png)
 
-Notes, Replies from Agents and System messages shouldn't appear.
+Notes, Replies from Agents and System messages shouldn't appear.
+
+## Adding pull's from original repo:
+ +0.2 - 17 december 2016
+ +[feature] "Ignore when subject equals regex" by @ramonfincken

config.php

@@ -20,25 +20,41 @@ function ($x, $y, $n) {
         return Plugin::translate('slack');
     }
 
+    function pre_save($config, &$errors) {
+        if ($config['slack-regex-subject-ignore'] && false === @preg_match("/{$config['slack-regex-subject-ignore']}/i", null)) {
+            $errors['err'] = 'Your regex was invalid, try something like "spam", it will become: "/spam/i" when we use it.';
+            return FALSE;
+        }
+        return TRUE;
+    }
+
     function getOptions() {
         list ($__, $_N) = self::translate();
 
         return array(
-            'slack'             => new SectionBreakField(array(
+            'slack'                      => new SectionBreakField(array(
                 'label' => $__('Slack notifier'),
-                'hint'  => $__('Create a new app for your workspace first!')
+                'hint'  => $__('Readme first: https://github.com/clonemeagain/osticket-slack')
                     )),
-            'slack-webhook-url' => new TextboxField(array(
-                'label'         => 'Webhook URL',
+            'slack-webhook-url'          => new TextboxField(array(
+                'label'         => $__('Webhook URL'),
                 'configuration' => array(
                     'size'   => 100,
                     'length' => 200
                 ),
                     )),
-            'display-dept'      => new BooleanField([
+            'display-dept'               => new BooleanField([
                 'label'   => $__('Add field for Department in Slack notice'),
                 'default' => FALSE,
-                    ])
+                    ]),
+            'slack-regex-subject-ignore' => new TextboxField([
+                'label'         => $__('Ignore when subject equals regex'),
+                'hint'          => $__('Auto delimited, always case-insensitive'),
+                'configuration' => [
+                    'size'   => 30,
+                    'length' => 200
+                ],
+                    ]),
         );
     }
 

slack.php

@@ -40,12 +40,11 @@ function onTicketCreated(Ticket $ticket) {
         $plaintext = Format::html2text($ticket->getMessages()[0]->getBody()->getClean());
 
         // Format the messages we'll send.
-        $heading = sprintf('%s CONTROLSTART%sscp/tickets.php?id=%d|#%s - %sCONTROLEND %s'
+        $heading = sprintf('%s CONTROLSTART%sscp/tickets.php?id=%d|#%sCONTROLEND %s'
                 , __("New Ticket")
                 , $cfg->getBaseUrl()
                 , $ticket->getId()
                 , $ticket->getNumber()
-                , $ticket->getSubject()
                 , __("created"));
         $body    = sprintf('%s %s (%s) %s'
                 , __("Created by")
@@ -75,6 +74,10 @@ function onTicketUpdated(ThreadEntry $entry) {
 
         // Need to fetch the ticket from the ThreadEntry
         $ticket = $this->getTicket($entry);
+        if (!$ticket instanceof Ticket) {
+            // Admin created ticket's won't work here.
+            return;
+        }
 
         // Check to make sure this entry isn't the first (ie: a New ticket)
         $first_entry = $ticket->getMessages()[0];
@@ -86,12 +89,11 @@ function onTicketUpdated(ThreadEntry $entry) {
         $plaintext = Format::html2text($entry->getBody()->getClean());
 
         // Format the messages we'll send
-        $heading = sprintf('%s CONTROLSTART%sscp/tickets.php?id=%d|#%s %sCONTROLEND %s'
+        $heading = sprintf('%s CONTROLSTART%sscp/tickets.php?id=%d|#%sCONTROLEND %s'
                 , __("Ticket")
                 , $cfg->getBaseUrl()
                 , $ticket->getId()
                 , $ticket->getNumber()
-                , $ticket->getSubject()
                 , __("updated"));
         $body    = sprintf('%s %s (%s) %s %s %s'
                 , __("by")
@@ -125,6 +127,16 @@ function sendToSlack(Ticket $ticket, $heading, $body, $colour = 'good') {
             $ost->logError('Slack Plugin not configured', 'You need to read the Readme and configure a webhook URL before using this.');
         }
 
+        // Check the subject, see if we want to filter it.
+        $regex_subject_ignore = $this->getConfig()->get('slack-regex-subject-ignore');
+        // Filter on subject, and validate regex:
+        if ($regex_subject_ignore && preg_match("/$regex_subject_ignore/i", $ticket->getSubject())) {
+            $ost->logDebug('Ignored Message', 'Slack notification was not sent because the subject (' . $ticket->getSubject() . ') matched regex (' . htmlspecialchars($regex_subject_ignore) . ').');
+            return;
+        } else {
+            error_log("$ticket_subject didn't trigger $regex_subject_ignore");
+        }
+
         $heading = $this->format_text($heading);
         $body    = $this->format_text($body);