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+/**
+ * @fileoverview Test case for mixed-content in Web Platform Tests.
+ * @author burnik@google.com (Kristijan Burnik)
+ */
+
+/**
+ * MixedContentTestCase exercises all the tests for checking browser behavior
+ * when resources regarded as mixed-content are requested. A single run covers
+ * only a single scenario.
+ * @param {object} scenario A JSON describing the test arrangement and
+ *     expectation(s). Refer to /mixed-content/spec.src.json for details.
+ * @param {string} description The test scenario verbose description.
+ * @param {SanityChecker} sanityChecker Instance of an object used to check the
+ *     running scenario. Useful in debug mode. See ./sanity-checker.js.
+ *     Run {@code ./tools/generate.py -h} for info on test generating modes.
+ * @return {object} Object wrapping the start method used to run the test.
+ */
+function MixedContentTestCase(scenario, description, sanityChecker) {
+  var httpProtocol = "http";
+  var httpsProtocol = "https";
+  var wsProtocol = "ws";
+  var wssProtocol = "wss";
+
+  var sameOriginHost = location.hostname;
+  var crossOriginHost = "{{domains[www1]}}";
+
+  // These values can evaluate to either empty strings or a ":port" string.
+  var httpPort = getNormalizedPort(parseInt("{{ports[http][0]}}", 10));
+  var httpsPort = getNormalizedPort(parseInt("{{ports[https][0]}}", 10));
+  var wsPort = getNormalizedPort(parseInt("{{ports[ws][0]}}", 10));
+  var wssPort = getNormalizedPort(parseInt("{{ports[wss][0]}}", 10));
+
+  var resourcePath = "/mixed-content/generic/expect.py";
+  var wsResourcePath = "/stash_responder";
+
+  // Map all endpoints to scenario for use in the test.
+  var endpoint = {
+    "same-origin":
+      location.origin + resourcePath,
+    "same-host-https":
+      httpsProtocol + "://" + sameOriginHost + httpsPort + resourcePath,
+    "same-host-http":
+      httpProtocol + "://" + sameOriginHost + httpPort + resourcePath,
+    "cross-origin-https":
+      httpsProtocol + "://" + crossOriginHost + httpsPort + resourcePath,
+    "cross-origin-http":
+      httpProtocol + "://" + crossOriginHost + httpPort + resourcePath,
+    "same-host-wss":
+      wssProtocol + "://" + sameOriginHost + wssPort + wsResourcePath,
+    "same-host-ws":
+      wsProtocol + "://" + sameOriginHost + wsPort + wsResourcePath,
+    "cross-origin-wss":
+      wssProtocol + "://" + crossOriginHost + wssPort + wsResourcePath,
+    "cross-origin-ws":
+      wsProtocol + "://" + crossOriginHost + wsPort + wsResourcePath
+  };
+
+  // Mapping all the resource requesting methods to the scenario.
+  var resourceMap = {
+    "a-tag": requestViaAnchor,
+    "area-tag": requestViaArea,
+    "fetch-request": requestViaFetch,
+    "form-tag": requestViaForm,
+    "iframe-tag": requestViaIframe,
+    "img-tag":  requestViaImage,
+    "script-tag": requestViaScript,
+    "worker-request": requestViaWorker,
+    "xhr-request": requestViaXhr,
+    "audio-tag": requestViaAudio,
+    "video-tag": requestViaVideo,
+    "picture-tag": requestViaPicture,
+    "object-tag": requestViaObject,
+    "link-css-tag": requestViaLinkStylesheet,
+    "link-prefetch-tag": requestViaLinkPrefetch,
+    "websocket-request": requestViaWebSocket
+  };
+
+  sanityChecker.checkScenario(scenario, resourceMap);
+
+  // Mapping all expected MIME types to the scenario.
+  var contentType = {
+    "a-tag": "text/html",
+    "area-tag": "text/html",
+    "fetch-request": "application/json",
+    "form-tag": "text/html",
+    "iframe-tag": "text/html",
+    "img-tag":  "image/png",
+    "script-tag": "text/javascript",
+    "worker-request": "application/javascript",
+    "xhr-request": "application/json",
+    "audio-tag": "audio/mpeg",
+    "video-tag": "video/mp4",
+    "picture-tag": "image/png",
+    "object-tag": "text/html",
+    "link-css-tag": "text/css",
+    "link-prefetch-tag": "text/html",
+    "websocket-request": "application/json"
+  };
+
+  var mixed_content_test = async_test(description);
+
+  function runTest() {
+    sanityChecker.setFailTimeout(mixed_content_test);
+
+    var key = guid();
+    var value = guid();
+    // We use the same path for both HTTP/S and WS/S stash requests.
+    var stash_path = encodeURIComponent("/mixed-content");
+    var announceResourceRequestUrl = endpoint['same-origin'] +
+                                     "?action=put&key=" + key +
+                                     "&value=" + value +
+                                     "&path=" + stash_path;
+    var assertResourceRequestUrl = endpoint['same-origin'] +
+                                  "?action=take&key=" + key +
+                                  "&path=" + stash_path;
+    var resourceRequestUrl = endpoint[scenario.origin] + "?redirection=" +
+                             scenario.redirection + "&action=purge&key=" + key +
+                             "&path=" + stash_path + "&content_type=" +
+                             contentType[scenario.subresource];
+
+    xhrRequest(announceResourceRequestUrl)
+      .then(function(response) {
+        // Send out the real resource request.
+        // This should tear down the key if it's not blocked.
+        return resourceMap[scenario.subresource](resourceRequestUrl);
+      })
+      .then(function() {
+        mixed_content_test.step(function() {
+          assert_equals("allowed", scenario.expectation,
+                        "The triggered event should match '" +
+                        scenario.expectation + "'.");
+        }, "Check if success event was triggered.");
+
+        // Send request to check if the key has been torn down.
+        return xhrRequest(assertResourceRequestUrl);
+      }, function(error) {
+        mixed_content_test.step(function() {
+          assert_equals("blocked", scenario.expectation,
+                        "The triggered event should match '" +
+                        scenario.expectation + "'.");
+          // TODO(kristijanburnik): param "error" can be an event or error.
+          // Map assertion by resource.
+          // e.g.: assert_equals(e.type, "error");
+        }, "Check if error event was triggered.");
+
+        // When requestResource fails, we also check the key state.
+        return xhrRequest(assertResourceRequestUrl);
+      })
+      .then(function(response) {
+         // Now check if the value has been torn down. If it's still there,
+         // we have blocked the request to mixed-content.
+         mixed_content_test.step(function() {
+           assert_equals(response.status, scenario.expectation,
+                  "The resource request should be '" + scenario.expectation +
+                  "'.");
+         }, "Check if request was sent.");
+         mixed_content_test.done();
+      });
+
+  }  // runTest
+
+  return {start: runTest};
+}  // MixedContentTestCase