Send "Precondition Failed" message body with 412 responses

spec/swift/app_spec.rb

@@ -165,7 +165,82 @@ describe "App" do
           last_response.status.must_equal 400
         end
       end
+
+      describe "If-Match header" do
+        before do
+          put_stub = OpenStruct.new(headers: {
+            etag: "oldetag",
+            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT"
+          })
+
+          RestClient.stub :put, put_stub do
+            put "/phil/food/aguacate", "si"
+          end
+        end
+
+        it "allows the request if the header matches the current ETag" do
+          header "If-Match", "\"oldetag\""
+
+          put_stub = OpenStruct.new(headers: {
+            etag: "newetag",
+            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT"
+          })
+
+          RestClient.stub :put, put_stub do
+            put "/phil/food/aguacate", "aye"
+          end
+
+          last_response.status.must_equal 200
+          last_response.headers["Etag"].must_equal "\"newetag\""
+        end
+
+        it "fails the request if the header does not match the current ETag" do
+          header "If-Match", "someotheretag"
+
+          put "/phil/food/aguacate", "aye"
+
+          last_response.status.must_equal 412
+          last_response.body.must_equal "Precondition Failed"
+        end
+      end
+
+      describe "If-None-Match header set to '*'" do
+        it "succeeds when the document doesn't exist yet" do
+          put_stub = OpenStruct.new(headers: {
+            etag: "someetag",
+            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT"
+          })
+
+          header "If-None-Match", "*"
+
+          RestClient.stub :put, put_stub do
+            put "/phil/food/aguacate", "si"
+          end
+
+          last_response.status.must_equal 200
+        end
+
+        it "fails the request if the document already exsits" do
+          put_stub = OpenStruct.new(headers: {
+            etag: "someetag",
+            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT"
+          })
+
+          RestClient.stub :put, put_stub do
+            put "/phil/food/aguacate", "si"
+          end
+
+          header "If-None-Match", "*"
+          RestClient.stub :put, put_stub do
+            put "/phil/food/aguacate", "si"
+          end
+
+          last_response.status.must_equal 412
+          last_response.body.must_equal "Precondition Failed"
+        end
+      end
     end
+
   end
 
   describe "DELETE requests" do
@@ -273,6 +348,27 @@ describe "App" do
         last_response.status.must_equal 404
         last_response.body.must_equal "Not Found"
       end
+
+      describe "If-Match header" do
+        it "succeeds when the header matches the current ETag" do
+          header "If-Match", "\"bla\""
+
+          RestClient.stub :delete, "" do
+            delete "/phil/food/aguacate"
+          end
+
+          last_response.status.must_equal 200
+        end
+
+        it "fails the request if it does not match the current ETag" do
+          header "If-Match", "someotheretag"
+
+          delete "/phil/food/aguacate"
+
+          last_response.status.must_equal 412
+          last_response.body.must_equal "Precondition Failed"
+        end
+      end
     end
   end