Ignore invalid URLs for camo

When people only write `https://` as image URL, this would fail with
`Addressable::URI::InvalidURIError: Absolute URI missing hierarchical segment: 'https://'`.

closes #7922

Changelog.md

@@ -1,15 +1,14 @@
 # 0.7.8.0
 
 ## Refactor
-
 * Make setting up a development environment 9001% easier by adding a Docker-based setup [#7870](https://github.com/diaspora/diaspora/pull/7870)
 * Improve `web+diaspora://` handler description [#7909](https://github.com/diaspora/diaspora/pull/7909)
 * Move comment timestamp next to author name [#7905](https://github.com/diaspora/diaspora/pull/7905)
 
 ## Bug fixes
+* Ignore invalid URLs for camo [#7922](https://github.com/diaspora/diaspora/pull/7922)
 
 ## Features
-
 * Add the ability to assign roles in the admin panel [#7868](https://github.com/diaspora/diaspora/pull/7868)
 * Improve memory usage with libjemalloc if available [#7919](https://github.com/diaspora/diaspora/pull/7919)
 

lib/diaspora/camo.rb

@@ -17,7 +17,11 @@ module Diaspora
       return unless url
       return url unless self.url_eligible?(url)
 
-      url = Addressable::URI.encode(Addressable::URI.unencode(url))
+      begin
+        url = Addressable::URI.encode(Addressable::URI.unencode(url))
+      rescue Addressable::URI::InvalidURIError
+        return url
+      end
 
       digest = OpenSSL::HMAC.hexdigest(
         OpenSSL::Digest.new('sha1'),

spec/lib/diaspora/camo_spec.rb

@@ -48,6 +48,10 @@ describe Diaspora::Camo do
         expect(Diaspora::Camo.image_url("https://example.com/%C3%A1%C3%A9%C3%B3?foo=%C3%A4%C3%BC%C3%B6&bar=a%CC%80"))
           .to eq(camo_image_url)
       end
+
+      it "ignores invalid urls" do
+        expect(Diaspora::Camo.image_url("https://")).to eq("https://")
+      end
     end
   end