From 5edeb0250b1fe1cb6b8e89282b661ab13025e7f0 Mon Sep 17 00:00:00 2001
From: Max Kostikov <max@kostikov.co>
Date: Sun, 13 Oct 2019 14:27:54 +0200
Subject: Revert "Remove visible channels list from pubstream tags cloud
 creation procedure"

This reverts commit 5c4c6e68f600d50deed8ddb32dd6702af9b52853
---
 Zotlabs/Module/Articles.php | 12 +++++---
 Zotlabs/Module/Channel.php  | 21 +++++---------
 include/opengraph.php       | 71 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+), 18 deletions(-)
 create mode 100644 include/opengraph.php

diff --git a/Zotlabs/Module/Articles.php b/Zotlabs/Module/Articles.php
index ca132c01e..e3ad54be8 100644
--- a/Zotlabs/Module/Articles.php
+++ b/Zotlabs/Module/Articles.php
@@ -9,6 +9,7 @@ use Zotlabs\Lib\PermissionDescription;
 require_once('include/channel.php');
 require_once('include/conversation.php');
 require_once('include/acl_selectors.php');
+require_once('include/opengraph.php');
 
 
 class Articles extends Controller {
@@ -192,7 +193,7 @@ class Articles extends Controller {
 
 			$parents_str = ids_to_querystr($r,'id');
 
-			$items = q("SELECT item.*, item.id AS item_id
+			$r = q("SELECT item.*, item.id AS item_id
 				FROM item
 				WHERE item.uid = %d $item_normal
 				AND item.parent IN ( %s )
@@ -200,15 +201,18 @@ class Articles extends Controller {
 				intval(App::$profile['profile_uid']),
 				dbesc($parents_str)
 			);
-			if($items) {
-				xchan_query($items);
-				$items = fetch_post_tags($items, true);
+			if($r) {
+				xchan_query($r);
+				$items = fetch_post_tags($r, true);
 				$items = conv_sort($items,'updated');
 			}
 			else
 				$items = [];
 		}
 
+		// Add Opengraph markup
+		opengraph_add_meta(((! empty($items)) ? $r[0] : array()), App::$profile);
+
 		$mode = 'articles';
 			
 		if(get_pconfig(local_channel(),'system','articles_list_mode') && (! $selected_card))
diff --git a/Zotlabs/Module/Channel.php b/Zotlabs/Module/Channel.php
index b1639b213..3f617fd18 100644
--- a/Zotlabs/Module/Channel.php
+++ b/Zotlabs/Module/Channel.php
@@ -13,6 +13,7 @@ require_once('include/items.php');
 require_once('include/security.php');
 require_once('include/conversation.php');
 require_once('include/acl_selectors.php');
+require_once('include/opengraph.php');
 
 
 /**
@@ -111,17 +112,6 @@ class Channel extends Controller {
 		// we start loading content
 
 		profile_load($which,$profile);
-
-		App::$page['htmlhead'] .= '<meta property="og:title" content="' . htmlspecialchars($channel['channel_name']) . '">' . "\r\n";
-		App::$page['htmlhead'] .= '<meta property="og:image" content="' . $channel['xchan_photo_l'] . '">' . "\r\n";
-
-		if(App::$profile['about'] && perm_is_allowed($channel['channel_id'],get_observer_hash(),'view_profile')) {
-			App::$page['htmlhead'] .= '<meta property="og:description" content="' . htmlspecialchars(App::$profile['about']) . '">' . "\r\n";
-		}
-		else {
-			App::$page['htmlhead'] .= '<meta property="og:description" content="' . htmlspecialchars(sprintf( t('This is the home page of %s.'), $channel['channel_name'])) . '">' . "\r\n";
-		}
-
 	}
 
 	function get($update = 0, $load = false) {
@@ -362,7 +352,7 @@ class Channel extends Controller {
 
 			$parents_str = ids_to_querystr($r,'item_id');
 
-			$items = q("SELECT item.*, item.id AS item_id
+			$r = q("SELECT item.*, item.id AS item_id
 				FROM item
 				WHERE item.uid = %d $item_normal
 				AND item.parent IN ( %s )
@@ -371,8 +361,8 @@ class Channel extends Controller {
 				dbesc($parents_str)
 			);
 
-			xchan_query($items);
-			$items = fetch_post_tags($items, true);
+			xchan_query($r);
+			$items = fetch_post_tags($r, true);
 			$items = conv_sort($items,$ordering);
 
 			if($load && $mid && (! count($items))) {
@@ -385,6 +375,9 @@ class Channel extends Controller {
 			$items = array();
 		}
 
+		// Add Opengraph markup
+		opengraph_add_meta((isset($decoded) && (! empty($items)) ? $r[0] : array()), App::$profile);
+
 		if((! $update) && (! $load)) {
 
 			if($decoded)
diff --git a/include/opengraph.php b/include/opengraph.php
new file mode 100644
index 000000000..2d72ffca1
--- /dev/null
+++ b/include/opengraph.php
@@ -0,0 +1,71 @@
+<?php
+/**
+ * @file include/opengraph.php
+ * @brief Add Opengraph metadata and related functions.
+ */
+ 
+ 
+ /**
+ * @brief Adds Opengraph meta tags into HTML head
+ *
+ * @param array $item
+ * @param array $profile
+ *
+ */
+ 
+ function opengraph_add_meta($item, $profile) {
+
+	if(! empty($item)) {
+
+		if(! empty($item['title']))
+			$ogtitle = $item['title'];
+
+		// find first image if exist
+		if(preg_match("/\[[zi]mg(=[0-9]+x[0-9]+)?\]([^\[]+)/is", $item['body'], $matches))
+			$ogimage = $matches[2];
+
+		// use summary as description if exist
+		$ogdesc = (empty($item['summary']) ? $item['body'] : $item['summary'] );
+		
+		$ogdesc = str_replace("#^[", "[", $ogdesc);
+	
+		$ogdesc = bbcode($ogdesc, [ 'tryoembed' => false ]);
+		$ogdesc = trim(html2plain($ogdesc, 0, true));
+		$ogdesc = html_entity_decode($ogdesc, ENT_QUOTES, 'UTF-8');
+		
+		// remove all URLs
+		$ogdesc = preg_replace("/https?\:\/\/[a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,\@]+/", "", $ogdesc);
+		
+		// shorten description
+		$ogdesc = substr($ogdesc, 0, 300);
+		$ogdesc = str_replace("\n", " ", $ogdesc);
+		while (strpos($ogdesc, "  ") !== false)
+			$ogdesc = str_replace("  ", " ", $ogdesc);
+		$ogdesc = rtrim(substr($ogdesc, 0, strrpos($ogdesc, " ")), "?.,:;!-") . "...";
+		
+		$ogtype = "article";
+	}
+
+	$channel = channelx_by_n($profile['profile_uid']);
+
+	if(! isset($ogdesc)) {
+		if($profile['about'] && perm_is_allowed($channel['channel_id'],get_observer_hash(),'view_profile')) {
+			$ogdesc = $profile['about'];
+		}
+		else {
+			$ogdesc = sprintf( t('This is the home page of %s.'), $channel['channel_name']);
+		}
+	}
+	
+	if(! isset($ogimage))
+		$ogimage = $channel['xchan_photo_l'];
+
+	App::$page['htmlhead'] .= '<meta property="og:title" content="' . htmlspecialchars((isset($ogtitle) ? $ogtitle : $channel['channel_name'])) . '">' . "\r\n";
+	App::$page['htmlhead'] .= '<meta property="og:image" content="' . $ogimage . '">' . "\r\n";
+	App::$page['htmlhead'] .= '<meta property="og:image:type" content="' . guess_image_type($ogimage) . '">' . "\r\n";
+	App::$page['htmlhead'] .= '<meta property="og:description" content="' . htmlspecialchars($ogdesc) . '">' . 	"\r\n";
+	App::$page['htmlhead'] .= '<meta property="og:type" content="' . (isset($ogtype) ? $ogtype : "profile") . '">' . "\r\n";
+
+	return true;
+ }
+ 
\ No newline at end of file
-- 
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