<?php
/*******
GitScord --- a middleman webhook between gitlab and discord
https://gitlab.crans.org/elkmaennchen/gitscord-webhook

Copyright (C) 2020 CROSIO Gauthier

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*******/

// get the gitlab data
$phpInput = 'php://input';
$plainJSON = file_get_contents($phpInput);
// if call by a webhook (not GET method)
if ($plainJSON != '') {
	// get configuration
	$configJSON = json_decode(file_get_contents("./gitscord_webhook_config.json"), true);
	$url = $configJSON['discord_url']; // Discord webhook url
	$languages = array("fr", "es", "en");
	$lang = $configJSON['language']; // language used for messages
	if (!in_array($lang, $languages)) {
		$lang="en"; // default language if not avaible
	}
	$messageJSON = array(); // JSON to send to Discord
	if ($configJSON['bot_name'] != '') {
		$messageJSON['username'] = $configJSON['bot_name'] ;
	}
	if ($configJSON['bot_avatar'] != '') {
		$messageJSON['avatar_url'] = $configJSON['bot_avatar'] ;
	}
	// process gitlab data
	$JSON = json_decode($plainJSON, true);
	if (is_array($JSON)) { // valid JSON
		switch ($JSON['object_kind']){ // type of event
			case "push": // push event
				$messageJSON = push_layout($messageJSON,$JSON,$lang);
				break;
			case "tag_push":
				$messageJSON = tag_layout($messageJSON,$JSON,$lang);
				break;
			case "issue": // do the same weather its confidential or not
			case "confidential_issue":
				$messageJSON = issue_layout($messageJSON,$JSON,$lang);
				break;
			case "note": // do the same weather its confidential or not
			case "confidential_note":
				$messageJSON = note_layout($messageJSON,$JSON,$lang);
				break;
			case "merge_request":
				$messageJSON = MR_layout($messageJSON,$JSON,$lang);
				break;
			case "job":
				break;
			case "pipeline":
				break;
			case "wiki_page":
				break;
			default:
				send_error($url,"Unkown type of event");
		}
		// sending post request to Discord
		send_to_discord($url,$messageJSON);
		exit;
	}
}
// if call by GET method (not a webhook)
echo("42");

/*****
Functions declaration
*****/
function send_to_discord($url,$messageJSON){
	$ch = curl_init($url); // initiate cURL
	$tosendJSON = json_encode($messageJSON);
	curl_setopt($ch, CURLOPT_POST, 1); // ask for POST method
	curl_setopt($ch, CURLOPT_POSTFIELDS, $tosendJSON); // attach JSON
	curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
	$result = curl_exec($ch); // request itself
}

function send_error($url,$message="") { // showning an error on Discord chan
	send_to_discord($url, array('content' => "**An error occured with GitScord**\nPlease report in Issues tab on cr@ns gitlab (gitlab.crans.org/elkmaennchen/gitscord-webhook)\n".$message, 'username' => 'GitScord in fail'));
}

// _layout functions : markdown and JSON encapsulation for Discord

function push_layout($messageJSON,$JSON,$lang) {
	$txt_ligne_push=["fr"=>'nouveau(x) commit(s)',"es"=>'nuevo(s) commit(s)',"en"=>' ',];
	$txt_title_push=["fr"=>'a push dans',"es"=>'hizo un push en',"en"=>' ',];
	$txt_add_push=["fr"=>'Ajoutés',"es"=>'Añadidos',"en"=>' ',];
	$txt_mod_push=["fr"=>'Modifiés',"es"=>'Modificados',"en"=>' ',];
	$txt_suppr_push=["fr"=>'Supprimés',"es"=>'Suprimidos',"en"=>' ',];
	$messageJSON['content'] = $JSON['total_commits_count'].' '.$txt_ligne_push[$lang] ;
	$messageJSON['embeds'] = array();
	for ($numCommit=$JSON['total_commits_count']-1; $numCommit>=0; $numCommit--) {
		// strings of added, modified and deleted files in a single commit
		$lst_added = "";
		$lst_modified = "";
		$lst_deleted = "";
		foreach ($JSON['commits'][$numCommit]['added'] as $filename) {
			$lst_added = $lst_added.$filename."\n";
		}
		foreach ($JSON['commits'][$numCommit]['modified'] as $filename) {
			$lst_modified = $lst_modified.$filename."\n";
		}
		foreach ($JSON['commits'][$numCommit]['removed'] as $filename) {
			$lst_deleted = $lst_deleted.$filename."\n";
		}
		// an embed message for each commit
		array_push($messageJSON['embeds'],
		array('title'=> $txt_title_push[$lang].' *'.$JSON['project']['name'].'*',
			'description'=> "**".$JSON['commits'][$numCommit]['message']."**\n\n__".$txt_add_push[$lang]."__\n".$lst_added."\n__".$txt_mod_push[$lang]."__\n".$lst_modified."\n__".$txt_suppr_push[$lang]."__\n".$lst_deleted,
			'url'=> $JSON['commits'][$numCommit]['url'],
			'timestamp'=> $JSON['commits'][$numCommit]['timestamp'],
			'author'=> array('name'=> $JSON['commits'][$numCommit]['author']['name']))
		);
	}
	return($messageJSON);
}

function tag_layout($messageJSON,$JSON,$lang) {
	$txt_ligne_tag=["fr"=>'Nouveau tag',"es"=>'Nuevo tag',"en"=>' ',];
	$txt_title_tag=["fr"=>'a tagué un commit dans',"es"=>'hizo un tag en',"en"=>' ',];
	$messageJSON['content'] = $txt_ligne_tag[$lang] ;
	$messageJSON['embeds'] = array(array('title'=> $txt_title_tag[$lang].' *'.$JSON['project']['name'].'*',
		'description'=> $JSON['message'],
		'url'=> $JSON['project']['web_url'].$JSON['ref'],
		'timestamp'=> $JSON['commits'][0]['timestamp'],
		'author'=> array('name'=> $JSON['user_name'])),);
	return($messageJSON);
}

function issue_layout($messageJSON,$JSON,$lang) {
	$txt_ligne_issue=["fr"=>'Nouveau problème',"es"=>'Nuevo problema',"en"=>' ',];
	$txt_title_open_issue=["fr"=>'a ouvert une issue dans',"es"=>'abrió un asunto en',"en"=>' ',];
	$txt_title_update_issue=["fr"=>'a mis à jour une issue dans',"es"=>'actualizó un asunto en',"en"=>' ',];
	$txt_title_close_issue=["fr"=>'a fermé une issue dans',"es"=>'cierró un asunto en',"en"=>' ',];
	if ($JSON['object_attributes']['action'] == "open") {
		$txt_title_issue=$txt_title_open_issue[$lang];
	}
	else if ($JSON['object_attributes']['action'] == "close") {
		$txt_title_issue=$txt_title_close_issue[$lang];
	}
	else {
		$txt_title_issue=$txt_title_update_issue[$lang];
	}
	$messageJSON['content'] = $txt_ligne_issue[$lang] ;
	$messageJSON['embeds'] = array(array('title'=> $txt_title_issue.' *'.$JSON['project']['name'].'*',
		'description'=> "**".$JSON['object_attributes']['title']."**\n".$JSON['object_attributes']['description'],
		'url'=> $JSON['object_attributes']['url'],
		'timestamp'=> $JSON['object_attributes']['last_edited_at'],
		'author'=> array('name'=> $JSON['user']['name'])),);
	return($messageJSON);
}

function note_layout($messageJSON,$JSON,$lang) {
	$txt_ligne_note=["fr"=>'Nouvelle note',"es"=>'Nueva note',"en"=>' ',];
	$txt_title_note=["fr"=>'a noté quelque chose dans',"es"=>'marcó algo en',"en"=>' ',];
	$txt_object_name="";
	if ($JSON['object_attributes']['noteable_type'] == "Issue") {
		$txt_object_name=$JSON['issue']['title'];
	}
	else if ($JSON['object_attributes']['noteable_type'] == "Commit") {
		$txt_object_name=$JSON['commit']['message'];
	}
	else if ($JSON['object_attributes']['noteable_type'] == "MergeRequest") {
		$txt_object_name=$JSON['merge_request']['title'];
	}
	$messageJSON['content'] = $txt_ligne_note[$lang] ;
	$messageJSON['embeds'] = array(array('title'=> $txt_title_note[$lang].' *'.$JSON['project']['name'].'*',
		'description'=> "**".$JSON['object_attributes']['noteable_type']." *".$txt_object_name."***\n".$JSON['object_attributes']['note'],
		'url'=> $JSON['object_attributes']['url'],
		'timestamp'=> $JSON['object_attributes']['created_at'],
		'author'=> array('name'=> $JSON['user']['name'])),);
	return($messageJSON);
}

function MR_layout($messageJSON,$JSON,$lang) {
	$txt_ligne_MR=["fr"=>'Nouvelle merge request',"es"=>'Nueva merge request',"en"=>' ',];
	$txt_open_action=["fr"=>'a ouvert une MR dans',"es"=>'abrió una MR en',"en"=>' ',];
	$txt_merge_action=["fr"=>'a mergé une MR dans',"es"=>'ejecutó una MR en',"en"=>' ',];
	$txt_unknown_action=["fr"=>'a modifié une MR dans',"es"=>'cambió una MR en',"en"=>' ',];
	if ($JSON['object_attributes']['action'] == "open") {
		$txt_action=$txt_open_action[$lang];
		$txt_action_description=$JSON['object_attributes']['description'];
	}
	else if ($JSON['object_attributes']['action'] == "merge") {
		$txt_action=$txt_merge_action[$lang];
		$txt_action_description=$JSON['object_attributes']['source_branch'].'->'.$JSON['object_attributes']['target_branch'];
	}
	else {
		$txt_action=$txt_unkown_action[$lang];
		$txt_action_description="*Problem with webhook, please report.*";
	}
	$messageJSON['content'] = $txt_ligne_MR[$lang] ;
	$messageJSON['embeds'] = array(array('title'=> $txt_title_MR[$lang].' *'.$JSON['project']['name'].'*',
		'description'=> "**".$JSON['object_attributes']['title']."**\n".$txt_action_description,
		'url'=> $JSON['object_attributes']['url'],
		'timestamp'=> $JSON['object_attributes']['created_at'],
		'author'=> array('name'=> $JSON['user']['name'])),);
	return($messageJSON);
}

?>