From daa4922d908fb9ad5d973c597d0c60f769236c3e Mon Sep 17 00:00:00 2001
From: Alexandre Alapetite <alexandre@alapetite.fr>
Date: Sun, 22 Mar 2020 16:59:39 +0100
Subject: Add core extension for Google Groups (#2838)

* Add core extension for Google Groups

#Fix https://github.com/FreshRSS/FreshRSS/issues/2835
Add ability to discover RSS feeds for Google Groups
Based on https://github.com/FreshRSS/FreshRSS/pull/2837

* Allow HTTP in addition of HTTPS
---
 config.default.php                              |  5 +++--
 force-https.default.txt                         |  1 +
 lib/core-extensions/Google-Groups/README.md     |  3 +++
 lib/core-extensions/Google-Groups/extension.php | 10 ++++++++++
 lib/core-extensions/Google-Groups/metadata.json |  8 ++++++++
 5 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 lib/core-extensions/Google-Groups/README.md
 create mode 100644 lib/core-extensions/Google-Groups/extension.php
 create mode 100644 lib/core-extensions/Google-Groups/metadata.json

diff --git a/config.default.php b/config.default.php
index 71f8d477c..49869f7ac 100644
--- a/config.default.php
+++ b/config.default.php
@@ -175,9 +175,10 @@ return array(
 	),
 
 	# List of enabled FreshRSS extensions.
-	'extensions_enabled' => array(
+	'extensions_enabled' => [
+		'Google-Groups' => true,
 		'Tumblr-GDPR' => true,
-	),
+	],
 
 	# Disable self-update,
 	'disable_update' => false,
diff --git a/force-https.default.txt b/force-https.default.txt
index cae2d4ef2..6a1f32f36 100644
--- a/force-https.default.txt
+++ b/force-https.default.txt
@@ -8,6 +8,7 @@ fsfe.org
 github.com
 gitlab.com
 gnu.org
+google.com
 gravatar.com
 gstatic.com
 kernel.org
diff --git a/lib/core-extensions/Google-Groups/README.md b/lib/core-extensions/Google-Groups/README.md
new file mode 100644
index 000000000..21b901ded
--- /dev/null
+++ b/lib/core-extensions/Google-Groups/README.md
@@ -0,0 +1,3 @@
+# Google Groups
+
+Needed for discovering RSS feeds from [Google Groups](https://groups.google.com).
diff --git a/lib/core-extensions/Google-Groups/extension.php b/lib/core-extensions/Google-Groups/extension.php
new file mode 100644
index 000000000..656bf9b8f
--- /dev/null
+++ b/lib/core-extensions/Google-Groups/extension.php
@@ -0,0 +1,10 @@
+<?php
+class GoogleGroupsExtension extends Minz_Extension {
+	public function init() {
+		$this->registerHook('check_url_before_add', array('GoogleGroupsExtension', 'findFeed'));
+	}
+
+	public static function findFeed($url) {
+		return preg_replace('%^(https?://groups.google.com/forum)/#!forum/(.+)$%i', '$1/feed/$2/msgs/rss.xml', $url);
+	}
+}
diff --git a/lib/core-extensions/Google-Groups/metadata.json b/lib/core-extensions/Google-Groups/metadata.json
new file mode 100644
index 000000000..afaa18392
--- /dev/null
+++ b/lib/core-extensions/Google-Groups/metadata.json
@@ -0,0 +1,8 @@
+{
+	"name": "Google-Groups",
+	"author": "Alkarex",
+	"description": "To discover RSS feeds for Google Groups",
+	"version": 1.0,
+	"entrypoint": "GoogleGroups",
+	"type": "system"
+}
-- 
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