| // Copyright 2020 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "chrome/renderer/media/media_feeds.h" |
| |
| #include "content/public/renderer/render_frame.h" |
| #include "third_party/blink/public/platform/web_security_origin.h" |
| #include "third_party/blink/public/platform/web_string.h" |
| #include "third_party/blink/public/platform/web_url.h" |
| #include "third_party/blink/public/web/web_console_message.h" |
| #include "third_party/blink/public/web/web_document.h" |
| #include "third_party/blink/public/web/web_element.h" |
| #include "third_party/blink/public/web/web_local_frame.h" |
| #include "third_party/blink/public/web/web_node.h" |
| #include "url/gurl.h" |
| |
| using blink::WebDocument; |
| using blink::WebElement; |
| using blink::WebNode; |
| using blink::WebString; |
| |
| base::Optional<GURL> MediaFeeds::GetMediaFeedURL(content::RenderFrame* frame) { |
| // Media Feeds are only discovered on the main frame. |
| if (!frame->IsMainFrame()) |
| return base::nullopt; |
| |
| WebDocument document = frame->GetWebFrame()->GetDocument(); |
| if (document.IsNull()) |
| return base::nullopt; |
| |
| WebElement head = document.Head(); |
| if (head.IsNull()) |
| return base::nullopt; |
| |
| url::Origin document_origin = document.GetSecurityOrigin(); |
| |
| // Look for a <link> element in the <head> of the document. |
| for (WebNode child = head.FirstChild(); !child.IsNull(); |
| child = child.NextSibling()) { |
| if (!child.IsElementNode()) |
| continue; |
| |
| WebElement elem = child.To<WebElement>(); |
| if (!elem.HasHTMLTagName("link")) |
| continue; |
| |
| // The <link> rel must be feed. |
| std::string rel = elem.GetAttribute("rel").Utf8(); |
| if (!base::LowerCaseEqualsASCII(rel, "feed")) |
| continue; |
| |
| // The <link> type must the JSON+LD mime type. |
| std::string type = elem.GetAttribute("type").Utf8(); |
| if (!base::LowerCaseEqualsASCII(type, "application/ld+json")) |
| continue; |
| |
| WebString href = elem.GetAttribute("href"); |
| if (href.IsNull() || href.IsEmpty()) |
| continue; |
| |
| // If the URL is not valid then we should throw an error. |
| GURL url = document.CompleteURL(href); |
| if (!url.is_valid()) { |
| frame->AddMessageToConsole(blink::mojom::ConsoleMessageLevel::kWarning, |
| "The Media Feed URL is not a valid URL."); |
| |
| return base::nullopt; |
| } |
| |
| // If the URL is not the same origin as the document then we should throw |
| // and error. |
| auto feed_origin = url::Origin::Create(url); |
| if (!document_origin.IsSameOriginWith(feed_origin)) { |
| frame->AddMessageToConsole(blink::mojom::ConsoleMessageLevel::kWarning, |
| "The Media Feed URL needs to be the same " |
| "origin as the document URL."); |
| |
| return base::nullopt; |
| } |
| |
| return url; |
| } |
| |
| return base::nullopt; |
| } |
