From cd2c7f782f31dea6eb7e82c819393ea65d611665 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Wed, 7 Nov 2018 20:34:03 +0000
Subject: [PATCH] We now directly support the custom emojis from Mastodon

---
 src/Protocol/ActivityPub/Processor.php | 22 +++++++++++++--
 src/Protocol/ActivityPub/Receiver.php  | 38 +++++++++++++++++++++++++-
 src/Util/JsonLD.php                    |  3 +-
 3 files changed, 59 insertions(+), 4 deletions(-)

diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 1e50010108..383ad35d9c 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -39,6 +39,22 @@ class Processor
 		return $body;
 	}
 
+	/**
+	 * Replaces emojis in the body
+	 *
+	 * @param array $emojis
+	 * @param string $body
+	 *
+	 * @return string with replaced emojis
+	 */
+	public static function replaceEmojis($emojis, $body)
+	{
+		foreach ($emojis as $emoji) {
+			$body = str_replace($emoji['name'], '[img=16x16]' . $emoji['href'] . '[/img]', $body);
+		}
+		return $body;
+	}
+
 	/**
 	 * Constructs a string with tags for a given tag array
 	 *
@@ -115,7 +131,8 @@ class Processor
 		$item['edited'] = $activity['updated'];
 		$item['title'] = HTML::toBBCode($activity['name']);
 		$item['content-warning'] = HTML::toBBCode($activity['summary']);
-		$item['body'] = self::convertMentions(HTML::toBBCode($activity['content']));
+		$content = self::replaceEmojis($activity['emojis'], HTML::toBBCode($activity['content']));
+		$item['body'] = self::convertMentions($content);
 		$item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
 
 		Item::update($item, ['uri' => $activity['id']]);
@@ -250,7 +267,8 @@ class Processor
 		$item['guid'] = $activity['diaspora:guid'];
 		$item['title'] = HTML::toBBCode($activity['name']);
 		$item['content-warning'] = HTML::toBBCode($activity['summary']);
-		$item['body'] = self::convertMentions(HTML::toBBCode($activity['content']));
+		$content = self::replaceEmojis($activity['emojis'], HTML::toBBCode($activity['content']));
+		$item['body'] = self::convertMentions($content);
 
 		if (($activity['object_type'] == 'as:Video') && !empty($activity['alternate-url'])) {
 			$item['body'] .= "\n[video]" . $activity['alternate-url'] . '[/video]';
diff --git a/src/Protocol/ActivityPub/Receiver.php b/src/Protocol/ActivityPub/Receiver.php
index 2cc165b233..c958b9d6c3 100644
--- a/src/Protocol/ActivityPub/Receiver.php
+++ b/src/Protocol/ActivityPub/Receiver.php
@@ -727,13 +727,48 @@ class Receiver
 				continue;
 			}
 
-			$taglist[] = ['type' => str_replace('as:', '', JsonLD::fetchElement($tag, '@type')),
+			$element = ['type' => str_replace('as:', '', JsonLD::fetchElement($tag, '@type')),
 				'href' => JsonLD::fetchElement($tag, 'as:href'),
 				'name' => JsonLD::fetchElement($tag, 'as:name')];
+
+			if (empty($element['type'])) {
+				continue;
+			}
+
+			$taglist[] = $element;
 		}
 		return $taglist;
 	}
 
+	/**
+	 * Convert emojis from JSON-LD format into a simplified format
+	 *
+	 * @param array $tags Tags in JSON-LD format
+	 *
+	 * @return array with emojis in a simplified format
+	 */
+	private static function processEmojis($emojis)
+	{
+		$emojilist = [];
+
+		if (empty($emojis)) {
+			return [];
+		}
+
+		foreach ($emojis as $emoji) {
+			if (empty($emoji) || (JsonLD::fetchElement($emoji, '@type') != 'toot:Emoji') || empty($emoji['as:icon'])) {
+				continue;
+			}
+
+			$url = JsonLD::fetchElement($emoji['as:icon'], 'as:url');
+			$element = ['name' => JsonLD::fetchElement($emoji, 'as:name'),
+				'href' => $url];
+
+			$emojilist[] = $element;
+		}
+		return $emojilist;
+	}
+
 	/**
 	 * Convert attachments from JSON-LD format into a simplified format
 	 *
@@ -821,6 +856,7 @@ class Receiver
 		$object_data['longitude'] = JsonLD::fetchElement($object_data, 'longitude', '@value');
 		$object_data['attachments'] = self::processAttachments(JsonLD::fetchElementArray($object, 'as:attachment'));
 		$object_data['tags'] = self::processTags(JsonLD::fetchElementArray($object, 'as:tag'));
+		$object_data['emojis'] = self::processEmojis(JsonLD::fetchElementArray($object, 'as:tag', 'toot:Emoji'));
 		$object_data['generator'] = JsonLD::fetchElement($object, 'as:generator', 'as:name', '@type', 'as:Application');
 		$object_data['alternate-url'] = JsonLD::fetchElement($object, 'as:url');
 
diff --git a/src/Util/JsonLD.php b/src/Util/JsonLD.php
index bed7a67d60..78d81816e2 100644
--- a/src/Util/JsonLD.php
+++ b/src/Util/JsonLD.php
@@ -90,7 +90,8 @@ class JsonLD
 			'dfrn' => (object)['@id' => 'http://purl.org/macgirvin/dfrn/1.0/', '@type' => '@id'],
 			'diaspora' => (object)['@id' => 'https://diasporafoundation.org/ns/', '@type' => '@id'],
 			'ostatus' => (object)['@id' => 'http://ostatus.org#', '@type' => '@id'],
-			'dc' => (object)['@id' => 'http://purl.org/dc/terms/', '@type' => '@id']];
+			'dc' => (object)['@id' => 'http://purl.org/dc/terms/', '@type' => '@id'],
+			'toot' => (object)['@id' => 'http://joinmastodon.org/ns#', '@type' => '@id']];
 
 		$jsonobj = json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));