From 18b77224d3ce4ac6aa14278ca2dca34efb0956f5 Mon Sep 17 00:00:00 2001
From: Thibaut Girka <thib@sitedethib.com>
Date: Sun, 26 May 2019 15:10:33 +0200
Subject: [PATCH] Translate incoming remote img tags by a link

---
 app/lib/sanitize_config.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/app/lib/sanitize_config.rb b/app/lib/sanitize_config.rb
index 75c916485..a9a2351a4 100644
--- a/app/lib/sanitize_config.rb
+++ b/app/lib/sanitize_config.rb
@@ -19,6 +19,17 @@ class Sanitize
       node['class'] = class_list.join(' ')
     end
 
+    IMG_TAG_TRANSFORMER = lambda do |env|
+      node = env[:node]
+
+      return unless env[:node_name] == 'img'
+
+      node.name = 'a'
+
+      node['href'] = node['src']
+      node.content = "[🖼 #{node['alt'] || node['href']}]"
+    end
+
     MASTODON_STRICT ||= freeze_config(
       elements: %w(p br span a abbr del pre blockquote code b strong u sub i em h1 h2 h3 h4 h5 ul ol li),
 
@@ -43,6 +54,7 @@ class Sanitize
 
       transformers: [
         CLASS_WHITELIST_TRANSFORMER,
+        IMG_TAG_TRANSFORMER,
       ]
     )