Propagate referrer to new windows (#12397)

* Propagate referrer to new windows

Fixes #9205

* Rearrange -new-window event arguments for backwards-compatibility

* Plumb referrer policy through guest-window-manager

* Document the Referrer structure and its uses

* Add tests for referrer in new windows

* Docs nits

atom/browser/api/atom_api_app.cc

@@ -689,8 +689,8 @@ bool App::CanCreateWindow(
       content::WebContents::FromRenderFrameHost(opener);
   if (web_contents) {
     auto api_web_contents = WebContents::CreateFrom(isolate(), web_contents);
-    api_web_contents->OnCreateWindow(target_url, frame_name, disposition,
-                                     additional_features, body);
+    api_web_contents->OnCreateWindow(target_url, referrer, frame_name,
+                                     disposition, additional_features, body);
   }
 
   return false;

atom/browser/api/atom_api_web_contents.cc

@@ -525,12 +525,14 @@ bool WebContents::DidAddMessageToConsole(content::WebContents* source,
 
 void WebContents::OnCreateWindow(
     const GURL& target_url,
+    const content::Referrer& referrer,
     const std::string& frame_name,
     WindowOpenDisposition disposition,
     const std::vector<std::string>& features,
     const scoped_refptr<content::ResourceRequestBody>& body) {
   if (type_ == BROWSER_WINDOW || type_ == OFF_SCREEN)
-    Emit("-new-window", target_url, frame_name, disposition, features, body);
+    Emit("-new-window", target_url, frame_name, disposition, features, body,
+         referrer);
   else
     Emit("new-window", target_url, frame_name, disposition, features);
 }
@@ -1082,10 +1084,12 @@ void WebContents::LoadURL(const GURL& url, const mate::Dictionary& options) {
 
   content::NavigationController::LoadURLParams params(url);
 
-  GURL http_referrer;
-  if (options.Get("httpReferrer", &http_referrer))
-    params.referrer = content::Referrer(http_referrer.GetAsReferrer(),
-                                        blink::kWebReferrerPolicyDefault);
+  if (!options.Get("httpReferrer", &params.referrer)) {
+    GURL http_referrer;
+    if (options.Get("httpReferrer", &http_referrer))
+      params.referrer = content::Referrer(http_referrer.GetAsReferrer(),
+                                          blink::kWebReferrerPolicyDefault);
+  }
 
   std::string user_agent;
   if (options.Get("userAgent", &user_agent))

atom/browser/api/atom_api_web_contents.h

@@ -223,6 +223,7 @@ class WebContents : public mate::TrackableObject<WebContents>,
   // Create window with the given disposition.
   void OnCreateWindow(
       const GURL& target_url,
+      const content::Referrer& referrer,
       const std::string& frame_name,
       WindowOpenDisposition disposition,
       const std::vector<std::string>& features,

atom/common/native_mate_converters/blink_converter.cc

@@ -481,4 +481,56 @@ v8::Local<v8::Value> Converter<blink::WebCache::ResourceTypeStats>::ToV8(
   return dict.GetHandle();
 }
 
+// static
+v8::Local<v8::Value> Converter<blink::WebReferrerPolicy>::ToV8(
+      v8::Isolate* isolate,
+      const blink::WebReferrerPolicy& in) {
+  switch (in) {
+    case blink::kWebReferrerPolicyDefault:
+      return mate::StringToV8(isolate, "default");
+    case blink::kWebReferrerPolicyAlways:
+      return mate::StringToV8(isolate, "unsafe-url");
+    case blink::kWebReferrerPolicyNoReferrerWhenDowngrade:
+      return mate::StringToV8(isolate, "no-referrer-when-downgrade");
+    case blink::kWebReferrerPolicyNever:
+      return mate::StringToV8(isolate, "no-referrer");
+    case blink::kWebReferrerPolicyOrigin:
+      return mate::StringToV8(isolate, "origin");
+    case blink::kWebReferrerPolicyNoReferrerWhenDowngradeOriginWhenCrossOrigin:
+      return mate::StringToV8(isolate, "strict-origin-when-cross-origin");
+    case blink::kWebReferrerPolicySameOrigin:
+      return mate::StringToV8(isolate, "same-origin");
+    case blink::kWebReferrerPolicyStrictOrigin:
+      return mate::StringToV8(isolate, "strict-origin");
+    default:
+      return mate::StringToV8(isolate, "no-referrer");
+  }
+}
+
+// static
+bool Converter<blink::WebReferrerPolicy>::FromV8(v8::Isolate* isolate,
+      v8::Handle<v8::Value> val, blink::WebReferrerPolicy* out) {
+  std::string policy = base::ToLowerASCII(V8ToString(val));
+  if (policy == "default")
+    *out = blink::kWebReferrerPolicyDefault;
+  else if (policy == "unsafe-url")
+    *out = blink::kWebReferrerPolicyAlways;
+  else if (policy == "no-referrer-when-downgrade")
+    *out = blink::kWebReferrerPolicyNoReferrerWhenDowngrade;
+  else if (policy == "no-referrer")
+    *out = blink::kWebReferrerPolicyNever;
+  else if (policy == "origin")
+    *out = blink::kWebReferrerPolicyOrigin;
+  else if (policy == "strict-origin-when-cross-origin")
+    *out =
+        blink::kWebReferrerPolicyNoReferrerWhenDowngradeOriginWhenCrossOrigin;
+  else if (policy == "same-origin")
+    *out = blink::kWebReferrerPolicySameOrigin;
+  else if (policy == "strict-origin")
+    *out = blink::kWebReferrerPolicyStrictOrigin;
+  else
+    return false;
+  return true;
+}
+
 }  // namespace mate

atom/common/native_mate_converters/blink_converter.h

@@ -119,6 +119,14 @@ struct Converter<blink::WebCache::ResourceTypeStats> {
       const blink::WebCache::ResourceTypeStats& stats);
 };
 
+template<>
+struct Converter<blink::WebReferrerPolicy> {
+  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
+      const blink::WebReferrerPolicy& in);
+  static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
+                     blink::WebReferrerPolicy* out);
+};
+
 v8::Local<v8::Value> EditFlagsToV8(v8::Isolate* isolate, int editFlags);
 v8::Local<v8::Value> MediaFlagsToV8(v8::Isolate* isolate, int mediaFlags);
 

atom/common/native_mate_converters/content_converter.cc

@@ -318,4 +318,31 @@ bool Converter<content::WebContents*>::FromV8(
   return true;
 }
 
+// static
+v8::Local<v8::Value> Converter<content::Referrer>::ToV8(
+    v8::Isolate* isolate, const content::Referrer& val) {
+  mate::Dictionary dict = mate::Dictionary::CreateEmpty(isolate);
+  dict.Set("url", ConvertToV8(isolate, val.url));
+  dict.Set("policy", ConvertToV8(isolate, val.policy));
+  return mate::ConvertToV8(isolate, dict);
+}
+
+// static
+bool Converter<content::Referrer>::FromV8(
+    v8::Isolate* isolate,
+    v8::Local<v8::Value> val,
+    content::Referrer* out) {
+  mate::Dictionary dict;
+  if (!ConvertFromV8(isolate, val, &dict))
+    return false;
+
+  if (!dict.Get("url", &out->url))
+    return false;
+
+  if (!dict.Get("policy", &out->policy))
+    return false;
+
+  return true;
+}
+
 }  // namespace mate

atom/common/native_mate_converters/content_converter.h

@@ -9,6 +9,7 @@
 
 #include "content/public/browser/permission_type.h"
 #include "content/public/common/menu_item.h"
+#include "content/public/common/referrer.h"
 #include "content/public/common/stop_find_action.h"
 #include "native_mate/converter.h"
 #include "third_party/WebKit/public/platform/modules/permissions/permission_status.mojom.h"
@@ -71,6 +72,14 @@ struct Converter<content::WebContents*> {
                      content::WebContents** out);
 };
 
+template<>
+struct Converter<content::Referrer> {
+  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
+                                   const content::Referrer& val);
+  static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
+                     content::Referrer* out);
+};
+
 }  // namespace mate
 
 #endif  // ATOM_COMMON_NATIVE_MATE_CONVERTERS_CONTENT_CONVERTER_H_

docs/api/browser-window.md

@@ -1148,7 +1148,7 @@ Same as `webContents.capturePage([rect, ]callback)`.
 
 * `url` String
 * `options` Object (optional)
-  * `httpReferrer` String (optional) - A HTTP Referrer url.
+  * `httpReferrer` String (optional) - An HTTP Referrer url.
   * `userAgent` String (optional) - A user agent originating the request.
   * `extraHeaders` String (optional) - Extra headers separated by "\n"
   * `postData` ([UploadRawData[]](structures/upload-raw-data.md) | [UploadFile[]](structures/upload-file.md) | [UploadFileSystem[]](structures/upload-file-system.md) | [UploadBlob[]](structures/upload-blob.md)) (optional)

docs/api/structures/referrer.md

@@ -0,0 +1,10 @@
+# Referrer Object
+
+* `url` String - HTTP Referrer URL.
+* `policy` String - Can be `default`, `unsafe-url`,
+  `no-referrer-when-downgrade`, `no-referrer`, `origin`,
+  `strict-origin-when-cross-origin`, `same-origin`, `strict-origin`, or
+  `no-referrer`. See the [Referrer-Policy spec][1] for more details on the
+  meaning of these values.
+
+[1]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy

docs/api/web-contents.md

@@ -151,6 +151,9 @@ Returns:
   [`BrowserWindow`](browser-window.md).
 * `additionalFeatures` String[] - The non-standard features (features not handled
   by Chromium or Electron) given to `window.open()`.
+* `referrer` [Referrer](structures/referrer.md) - The referrer that will be
+  passed to the new window. May or may not result in the `Referer` header being
+  sent, depending on the referrer policy.
 
 Emitted when the page requests to open a new window for a `url`. It could be
 requested by `window.open` or an external link like `<a target='_blank'>`.
@@ -609,7 +612,7 @@ for windows with *offscreen rendering* enabled.
 
 * `url` String
 * `options` Object (optional)
-  * `httpReferrer` String (optional) - A HTTP Referrer url.
+  * `httpReferrer` (String | [Referrer](structures/referrer.md)) (optional) - An HTTP Referrer url.
   * `userAgent` String (optional) - A user agent originating the request.
   * `extraHeaders` String (optional) - Extra headers separated by "\n".
   * `postData` ([UploadRawData[]](structures/upload-raw-data.md) | [UploadFile[]](structures/upload-file.md) | [UploadFileSystem[]](structures/upload-file-system.md) | [UploadBlob[]](structures/upload-blob.md)) (optional)

docs/api/webview-tag.md

@@ -306,7 +306,7 @@ webview.addEventListener('dom-ready', () => {
 
 * `url` URL
 * `options` Object (optional)
-  * `httpReferrer` String (optional) - A HTTP Referrer url.
+  * `httpReferrer` String (optional) - An HTTP Referrer url.
   * `userAgent` String (optional) - A user agent originating the request.
   * `extraHeaders` String (optional) - Extra headers separated by "\n"
   * `postData` ([UploadRawData[]](structures/upload-raw-data.md) | [UploadFile[]](structures/upload-file.md) | [UploadFileSystem[]](structures/upload-file-system.md) | [UploadBlob[]](structures/upload-blob.md)) (optional) -

lib/browser/api/browser-window.js

@@ -19,16 +19,16 @@ BrowserWindow.prototype._init = function () {
   }
 
   // Make new windows requested by links behave like "window.open"
-  this.webContents.on('-new-window', (event, url, frameName,
-                                      disposition, additionalFeatures,
-                                      postData) => {
+  this.webContents.on('-new-window', (event, url, frameName, disposition,
+                                      additionalFeatures, postData,
+                                      referrer) => {
     const options = {
       show: true,
       width: 800,
       height: 600
     }
     ipcMain.emit('ELECTRON_GUEST_WINDOW_MANAGER_INTERNAL_WINDOW_OPEN',
-                 event, url, frameName, disposition,
+                 event, url, referrer, frameName, disposition,
                  options, additionalFeatures, postData)
   })
 
@@ -59,8 +59,9 @@ BrowserWindow.prototype._init = function () {
       height: height || 600,
       webContents: webContents
     }
+    const referrer = { url: '', policy: 'default' }
     ipcMain.emit('ELECTRON_GUEST_WINDOW_MANAGER_INTERNAL_WINDOW_OPEN',
-                 event, url, frameName, disposition, options)
+                 event, url, referrer, frameName, disposition, options)
   })
 
   // window.resizeTo(...)

lib/browser/guest-window-manager.js

@@ -102,7 +102,7 @@ const setupGuest = function (embedder, frameName, guest, options) {
 }
 
 // Create a new guest created by |embedder| with |options|.
-const createGuest = function (embedder, url, frameName, options, postData) {
+const createGuest = function (embedder, url, referrer, frameName, options, postData) {
   let guest = frameToGuest.get(frameName)
   if (frameName && (guest != null)) {
     guest.loadURL(url)
@@ -137,7 +137,9 @@ const createGuest = function (embedder, url, frameName, options, postData) {
     //
     // The above code would not work if a navigation to "about:blank" is done
     // here, since the window would be cleared of all changes in the next tick.
-    const loadOptions = {}
+    const loadOptions = {
+      httpReferrer: referrer
+    }
     if (postData != null) {
       loadOptions.postData = postData
       loadOptions.extraHeaders = 'content-type: application/x-www-form-urlencoded'
@@ -242,16 +244,17 @@ ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_OPEN', (event, url, frameName,
     }
   }
 
+  const referrer = { url: '', policy: 'default' }
   ipcMain.emit('ELECTRON_GUEST_WINDOW_MANAGER_INTERNAL_WINDOW_OPEN', event,
-               url, frameName, disposition, options, additionalFeatures)
+               url, referrer, frameName, disposition, options, additionalFeatures)
 })
 
 // Routed window.open messages with fully parsed options
-ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_INTERNAL_WINDOW_OPEN', function (event, url, frameName,
-                                                                  disposition, options,
+ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_INTERNAL_WINDOW_OPEN', function (event, url, referrer,
+                                                                  frameName, disposition, options,
                                                                   additionalFeatures, postData) {
   options = mergeBrowserWindowOptions(event.sender, options)
-  event.sender.emit('new-window', event, url, frameName, disposition, options, additionalFeatures)
+  event.sender.emit('new-window', event, url, frameName, disposition, options, additionalFeatures, referrer)
   const {newGuest} = event
   if ((event.sender.isGuest() && !event.sender.allowPopups) || event.defaultPrevented) {
     if (newGuest != null) {
@@ -265,7 +268,7 @@ ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_INTERNAL_WINDOW_OPEN', function (event
       event.returnValue = null
     }
   } else {
-    event.returnValue = createGuest(event.sender, url, frameName, options, postData)
+    event.returnValue = createGuest(event.sender, url, referrer, frameName, options, postData)
   }
 })
 

spec/api-web-contents-spec.js

@@ -708,4 +708,50 @@ describe('webContents module', () => {
       w.loadURL(`file://${fixtures}/pages/a.html`)
     })
   })
+
+  describe('referrer', () => {
+    it('propagates referrer information to new target=_blank windows', (done) => {
+      const server = http.createServer((req, res) => {
+        if (req.url === '/should_have_referrer') {
+          assert.equal(req.headers.referer, 'http://127.0.0.1:' + server.address().port + '/')
+          return done()
+        }
+        res.end('<a id="a" href="/should_have_referrer" target="_blank">link</a>')
+      })
+      server.listen(0, '127.0.0.1', () => {
+        const url = 'http://127.0.0.1:' + server.address().port + '/'
+        w.webContents.once('did-finish-load', () => {
+          w.webContents.once('new-window', (event, newUrl, frameName, disposition, options, features, referrer) => {
+            assert.equal(referrer.url, url)
+            assert.equal(referrer.policy, 'no-referrer-when-downgrade')
+          })
+          w.webContents.executeJavaScript('a.click()')
+        })
+        w.loadURL(url)
+      })
+    })
+
+    // TODO(jeremy): window.open() in a real browser passes the referrer, but
+    // our hacked-up window.open() shim doesn't. It should.
+    xit('propagates referrer information to windows opened with window.open', (done) => {
+      const server = http.createServer((req, res) => {
+        if (req.url === '/should_have_referrer') {
+          assert.equal(req.headers.referer, 'http://127.0.0.1:' + server.address().port + '/')
+          return done()
+        }
+        res.end('')
+      })
+      server.listen(0, '127.0.0.1', () => {
+        const url = 'http://127.0.0.1:' + server.address().port + '/'
+        w.webContents.once('did-finish-load', () => {
+          w.webContents.once('new-window', (event, newUrl, frameName, disposition, options, features, referrer) => {
+            assert.equal(referrer.url, url)
+            assert.equal(referrer.policy, 'no-referrer-when-downgrade')
+          })
+          w.webContents.executeJavaScript('window.open(location.href + "should_have_referrer")')
+        })
+        w.loadURL(url)
+      })
+    })
+  })
 })