Rescue invalid URLs during badge retrieval in asset proxy

changelogs/unreleased/use-addressable-for-asset-proxy-badge-render.yml

+---
+title: Rescue invalid URLs during badge retrieval in asset proxy
+merge_request: 26524
+author:
+type: fixed

lib/gitlab/asset_proxy.rb

@@ -11,12 +11,14 @@ module Gitlab
         return url if asset_host_whitelisted?(url)
 
         "#{Gitlab.config.asset_proxy.url}/#{asset_url_hash(url)}/#{hexencode(url)}"
+      rescue Addressable::URI::InvalidURIError
+        url
       end
 
       private
 
       def asset_host_whitelisted?(url)
-        parsed_url = URI.parse(url)
+        parsed_url = Addressable::URI.parse(url)
 
         Gitlab.config.asset_proxy.domain_regexp&.match?(parsed_url.host)
       end

spec/lib/gitlab/asset_proxy_spec.rb

@@ -33,9 +33,15 @@ describe Gitlab::AssetProxy do
       expect(described_class.proxy_url(url)).to eq(proxied_url)
     end
 
+    it 'returns original URL for invalid domains' do
+      url = 'foo_bar://'
+
+      expect(described_class.proxy_url(url)).to eq(url)
+    end
+
     context 'whitelisted domain' do
       it 'returns original URL for single domain whitelist' do
-        url = 'http://gitlab.com/test.png'
+        url = 'http://gitlab.com/${default_branch}/test.png'
 
         expect(described_class.proxy_url(url)).to eq(url)
       end