1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_BROWSING_TOPICS_BROWSING_TOPICS_URL_LOADER_INTERCEPTOR_H_
#define CONTENT_BROWSER_BROWSING_TOPICS_BROWSING_TOPICS_URL_LOADER_INTERCEPTOR_H_
#include "content/browser/loader/subresource_proxying_url_loader.h"
namespace content {
// A loader interceptor for handling a topics subresource request, including
// fetch(<url>, {browsingTopics: true}).
//
// This loader interceptor works as follows:
// 1. Before making a network request (i.e. WillStartRequest()), if the
// request is eligible for topics, calculates and adds the topics header.
// 2. For any redirect received (i.e. OnReceiveRedirect()), if the previous
// request or redirect was eligible for topics, and if the response header
// indicates an observation should be recorded, stores the observation.
// 3. For any followed redirect (i.e. WillFollowRedirect()), if the redirect
// is eligible for topics, calculates and adds/updates the topics header.
// 4. For the last response (i.e. OnReceiveResponse()), if the previous
// request or redirect was eligible for topics, and if the response header
// indicates an observation should be recorded, stores the observation.
class CONTENT_EXPORT BrowsingTopicsURLLoaderInterceptor
: public SubresourceProxyingURLLoader::Interceptor {
public:
BrowsingTopicsURLLoaderInterceptor(
WeakDocumentPtr document,
const network::ResourceRequest& resource_request);
BrowsingTopicsURLLoaderInterceptor(
const BrowsingTopicsURLLoaderInterceptor&) = delete;
BrowsingTopicsURLLoaderInterceptor& operator=(
const BrowsingTopicsURLLoaderInterceptor&) = delete;
~BrowsingTopicsURLLoaderInterceptor() override;
// SubresourceProxyingURLLoader::Interceptor
void WillStartRequest(net::HttpRequestHeaders& headers) override;
void WillFollowRedirect(const std::optional<GURL>& new_url,
std::vector<std::string>& removed_headers,
net::HttpRequestHeaders& modified_headers) override;
void OnReceiveRedirect(const net::RedirectInfo& redirect_info,
network::mojom::URLResponseHeadPtr& head) override;
void OnReceiveResponse(network::mojom::URLResponseHeadPtr& head) override;
private:
// Determines whether the ongoing request or redirect is eligible for topics,
// and updates `topics_eligible_`. If the request is eligible for topics,
// calculates and adds the topics header to `headers`. If `removed_headers` is
// provided (implying we are processing a redirect request), appends the
// topics header to `removed_headers`.
void PopulateRequestOrRedirectHeaders(
bool is_redirect,
net::HttpRequestHeaders& headers,
std::vector<std::string>* removed_headers);
// If the previous request or redirect was eligible for topics, and if the
// response header indicates that a topics observation should be recorded,
// stores the observation.
void ProcessRedirectOrResponseHeaders(
const network::mojom::URLResponseHeadPtr& head);
// Upon NavigationRequest::DidCommitNavigation(), `document_` will be set to
// the document that this request is associated with. It will become null
// whenever the document navigates away.
WeakDocumentPtr document_;
// The initial request state. This will be used to derive the opt-in
// permissions policy features for each request/redirect.
const raw_ref<const network::ResourceRequest> resource_request_;
// The current request or redirect URL.
GURL url_;
// Whether the ongoing request or redirect is eligible for topics. Set to the
// desired state when a request/redirect is made. Reset to false when the
// corresponding response is received.
bool topics_eligible_ = false;
};
} // namespace content
#endif // CONTENT_BROWSER_BROWSING_TOPICS_BROWSING_TOPICS_URL_LOADER_INTERCEPTOR_H_
|
