Set referrer on download requests

Note that the Referer header still won't be sent if the download is triggered
via an anchor element with the 'download' attribute: crbug.com/455987 .

Task-number: QTBUG-61354
Change-Id: I5af971af916b2190756e3e58f19736072a213922
Reviewed-by: Michal Klocek <michal.klocek@qt.io>

4 files changed, 71 insertions, 3 deletions

diff --git a/src/core/web_contents_adapter.cpp b/src/core/web_contents_adapter.cpp
index 9c78d67a0..6c1e6c721 100644
--- a/src/core/web_contents_adapter.cpp
+++ b/src/core/web_contents_adapter.cpp
@@ -928,7 +928,9 @@ void WebContentsAdapter::updateWebPreferences(const content::WebPreferences & we
     d->webContents->GetRenderViewHost()->UpdateWebkitPreferences(webPreferences);
 }
 
-void WebContentsAdapter::download(const QUrl &url, const QString &suggestedFileName)
+void WebContentsAdapter::download(const QUrl &url, const QString &suggestedFileName,
+                                  const QUrl &referrerUrl,
+                                  ReferrerPolicy referrerPolicy)
 {
     Q_D(WebContentsAdapter);
     content::BrowserContext *bctx = webContents()->GetBrowserContext();
@@ -941,9 +943,19 @@ void WebContentsAdapter::download(const QUrl &url, const QString &suggestedFileN
     dlmd->setDownloadType(BrowserContextAdapterClient::UserRequested);
     dlm->SetDelegate(dlmd);
 
+    GURL gurl = toGurl(url);
     std::unique_ptr<content::DownloadUrlParameters> params(
-            content::DownloadUrlParameters::CreateForWebContentsMainFrame(webContents(), toGurl(url)));
+        content::DownloadUrlParameters::CreateForWebContentsMainFrame(webContents(), gurl));
+
     params->set_suggested_name(toString16(suggestedFileName));
+
+    // referrer logic based on chrome/browser/renderer_context_menu/render_view_context_menu.cc:
+    params->set_referrer(
+        content::Referrer::SanitizeForRequest(
+            gurl,
+            content::Referrer(toGurl(referrerUrl).GetAsReferrer(),
+                              static_cast<blink::WebReferrerPolicy>(referrerPolicy))));
+
     dlm->DownloadUrl(std::move(params));
 }
 
@@ -1476,4 +1488,13 @@ ASSERT_ENUMS_MATCH(WebContentsAdapterClient::SaveToDiskDisposition, WindowOpenDi
 ASSERT_ENUMS_MATCH(WebContentsAdapterClient::OffTheRecordDisposition, WindowOpenDisposition::OFF_THE_RECORD)
 ASSERT_ENUMS_MATCH(WebContentsAdapterClient::IgnoreActionDisposition, WindowOpenDisposition::IGNORE_ACTION)
 
+ASSERT_ENUMS_MATCH(ReferrerPolicy::Always, blink::WebReferrerPolicyAlways)
+ASSERT_ENUMS_MATCH(ReferrerPolicy::Default, blink::WebReferrerPolicyDefault)
+ASSERT_ENUMS_MATCH(ReferrerPolicy::NoReferrerWhenDowngrade, blink::WebReferrerPolicyNoReferrerWhenDowngrade)
+ASSERT_ENUMS_MATCH(ReferrerPolicy::Never, blink::WebReferrerPolicyNever)
+ASSERT_ENUMS_MATCH(ReferrerPolicy::Origin, blink::WebReferrerPolicyOrigin)
+ASSERT_ENUMS_MATCH(ReferrerPolicy::OriginWhenCrossOrigin, blink::WebReferrerPolicyOriginWhenCrossOrigin)
+ASSERT_ENUMS_MATCH(ReferrerPolicy::NoReferrerWhenDowngradeOriginWhenCrossOrigin, blink::WebReferrerPolicyNoReferrerWhenDowngradeOriginWhenCrossOrigin)
+ASSERT_ENUMS_MATCH(ReferrerPolicy::Last, blink::WebReferrerPolicyLast)
+
 } // namespace QtWebEngineCore
diff --git a/src/core/web_contents_adapter.h b/src/core/web_contents_adapter.h
index 46c8d2604..67fcbe7af 100644
--- a/src/core/web_contents_adapter.h
+++ b/src/core/web_contents_adapter.h
@@ -124,7 +124,9 @@ public:
     quint64 findText(const QString &subString, bool caseSensitively, bool findBackward);
     void stopFinding();
     void updateWebPreferences(const content::WebPreferences &webPreferences);
-    void download(const QUrl &url, const QString &suggestedFileName);
+    void download(const QUrl &url, const QString &suggestedFileName,
+                  const QUrl &referrerUrl = QUrl(),
+                  ReferrerPolicy referrerPolicy = ReferrerPolicy::Default);
     bool isAudioMuted() const;
     void setAudioMuted(bool mute);
     bool recentlyAudible();
diff --git a/src/core/web_contents_adapter_client.h b/src/core/web_contents_adapter_client.h
index e1fb3dc4c..3cc5350df 100644
--- a/src/core/web_contents_adapter_client.h
+++ b/src/core/web_contents_adapter_client.h
@@ -71,6 +71,17 @@ class WebContentsAdapter;
 class WebContentsDelegateQt;
 class WebEngineSettings;
 
+// Must match blink::WebReferrerPolicy
+enum class ReferrerPolicy {
+    Always,
+    Default,
+    NoReferrerWhenDowngrade,
+    Never,
+    Origin,
+    OriginWhenCrossOrigin,
+    NoReferrerWhenDowngradeOriginWhenCrossOrigin,
+    Last = NoReferrerWhenDowngradeOriginWhenCrossOrigin,
+};
 
 class WebEngineContextMenuSharedData : public QSharedData {
 
@@ -96,6 +107,9 @@ public:
     QString suggestedFileName;
     QString misspelledWord;
     QStringList spellCheckerSuggestions;
+    QUrl pageUrl;
+    QUrl frameUrl;
+    ReferrerPolicy referrerPolicy = ReferrerPolicy::Default;
     // Some likely candidates for future additions as we add support for the related actions:
     //    bool isImageBlocked;
     //    <enum tbd> mediaType;
@@ -244,6 +258,34 @@ public:
         return d->spellCheckerSuggestions;
     }
 
+    void setFrameUrl(const QUrl &url) {
+        d->frameUrl = url;
+    }
+
+    QUrl frameUrl() const {
+        return d->frameUrl;
+    }
+
+    void setPageUrl(const QUrl &url) {
+        d->pageUrl = url;
+    }
+
+    QUrl pageUrl() const {
+        return d->pageUrl;
+    }
+
+    QUrl referrerUrl() const {
+        return !d->frameUrl.isEmpty() ? d->frameUrl : d->pageUrl;
+    }
+
+    void setReferrerPolicy(ReferrerPolicy referrerPolicy) {
+        d->referrerPolicy = referrerPolicy;
+    }
+
+    ReferrerPolicy referrerPolicy() const {
+        return d->referrerPolicy;
+    }
+
 private:
     QSharedDataPointer<WebEngineContextMenuSharedData> d;
 };
diff --git a/src/core/web_contents_view_qt.cpp b/src/core/web_contents_view_qt.cpp
index 844544887..86e839a7f 100644
--- a/src/core/web_contents_view_qt.cpp
+++ b/src/core/web_contents_view_qt.cpp
@@ -175,6 +175,9 @@ static inline WebEngineContextMenuData fromParams(const content::ContextMenuPara
     ret.setMisspelledWord(toQt(params.misspelled_word));
     ret.setSpellCheckerSuggestions(fromVector(params.dictionary_suggestions));
 #endif
+    ret.setFrameUrl(toQt(params.frame_url));
+    ret.setPageUrl(toQt(params.page_url));
+    ret.setReferrerPolicy((ReferrerPolicy)params.referrer_policy);
     return ret;
 }