Merge pull request CocoaPods#102 from CocoaPods/feature-accept-redirects

Accept new sources when they are just redirects

Author: fabiopelosin

lib/cocoapods-core/source/acceptor.rb

@@ -53,6 +53,25 @@ def analyze_path(spec_path)
       # @!group Private helpers
       #-----------------------------------------------------------------------#
 
+      # Resolve potential redirects and return the final URL.
+      #
+      # @return [string]
+      #
+      def get_actual_url(url)
+        loop do
+          require 'rest'
+          response = REST.head(url)
+
+          if response.status_code == 301
+            url = response.headers['location'].first
+          else
+            break
+          end
+        end
+
+        url
+      end
+
       # Checks whether the source of the proposed specification is different
       # from the one of the reference specification.
       #
@@ -68,11 +87,15 @@ def check_spec_source_change(spec, errors)
         source = spec.source.values_at(*keys).compact.first
         old_source = reference_spec(spec).source.values_at(*keys).compact.first
         unless source == old_source
-          message = "The source of the spec doesn't match with the recorded "
-          message << "ones. Source: `#{source}`. Previous: `#{old_source}`.\n "
-          message << 'Please contact the specs repo maintainers if the'
-          message << 'library changed location.'
-          errors << message
+          source = get_actual_url(source)
+          old_source = get_actual_url(old_source)
+          unless source == old_source
+            message = "The source of the spec doesn't match with the recorded "
+            message << "ones. Source: `#{source}`. Previous: `#{old_source}`.\n "
+            message << 'Please contact the specs repo maintainers if the'
+            message << 'library changed location.'
+            errors << message
+          end
         end
       end
 

spec/source/acceptor_spec.rb

@@ -4,6 +4,12 @@ module Pod
   describe Source::Acceptor do
 
     before do
+      WebMock::API.stub_request( :head, /http:\/\/banana-corp.local\/banana-lib.git/ ).to_return(
+        :status => 301, :headers => { 'Location' => 'http://NEW-URL/banana-lib.git' } )
+      WebMock::API.stub_request( :head, /http:\/\/evil-gorilla-fork\/banana-lib.git/ ).to_return(
+        :status => 200 )
+      WebMock::API.stub_request( :head, /http:\/\/new-url\/banana-lib.git/).to_return(
+        :status => 200 )
       @spec_path =  fixture('BananaLib.podspec')
       @spec = Specification.from_file(@spec_path)
       Specification.any_instance.stubs(:dependencies).returns([])
@@ -52,6 +58,12 @@ module Pod
         errors.should.not.match /The source of the spec doesn't match/
       end
 
+      it "doesn't fail if the new source of the specification is a redirect" do
+        @spec.source = { :git => 'http://NEW-URL/banana-lib.git', :tag => 'v1.0' }
+        errors = @sut.analyze(@spec).join("\n")
+        errors.should.not.match /The source of the spec doesn't match/
+      end
+
       it 'rejects a Git based specification without tag if there is at least one tagged version' do
         @spec.source = { :git => 'http://banana-corp.local/banana-lib.git', :commit => 'SHA' }
         errors = @sut.analyze(@spec).join("\n")