electron/patches/chromium/feat_expose_raw_response_headers_from_urlloader.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: deepak1556 <hop2deep@gmail.com>
Date: Tue, 17 Aug 2021 22:42:42 -0700
Subject: feat: expose raw response headers from URLLoader

With https://chromium-review.googlesource.com/c/chromium/src/+/2856099
unfiltered response headers are only available via trusted channel
through //services/network/public/mojom/devtools_observer.mojom.
https://github.com/electron/electron/pull/30503/commits/28f4da1582d046e96cb58f3cbb590503e89dfd0d
was an attempt to use this interface but given the original response is
signalled on a different interface via URLLoaderClient::OnReceiveResponse
it is harder to sync these data from two different channels for a synchronous
event emitted on the SimpleURLLoaderWrapper::OnResponseStarted.

This patch does the minimal approach to add back the raw response
headers, moving forward we should find a way in upstream to provide
access to these headers for loader clients created on the browser process.

diff --git a/services/network/public/cpp/resource_request.cc b/services/network/public/cpp/resource_request.cc
index a24972bd0d082e47036082983d93e862b6c28ab0..74ed551279314b728e129b6c344ee1b5de58701a 100644
--- a/services/network/public/cpp/resource_request.cc
+++ b/services/network/public/cpp/resource_request.cc
@@ -231,6 +231,7 @@ bool ResourceRequest::EqualsForTesting(const ResourceRequest& request) const {
          do_not_prompt_for_login == request.do_not_prompt_for_login &&
          is_main_frame == request.is_main_frame &&
          transition_type == request.transition_type &&
+         report_raw_headers == request.report_raw_headers &&
          previews_state == request.previews_state &&
          upgrade_if_insecure == request.upgrade_if_insecure &&
          is_revalidating == request.is_revalidating &&
diff --git a/services/network/public/cpp/resource_request.h b/services/network/public/cpp/resource_request.h
index 2857fb52a542eab7fa52938cbc6a292328cc2003..3a21c9f473f5c042a880d633f4b83a8f1c92fd1f 100644
--- a/services/network/public/cpp/resource_request.h
+++ b/services/network/public/cpp/resource_request.h
@@ -161,6 +161,7 @@ struct COMPONENT_EXPORT(NETWORK_CPP_BASE) ResourceRequest {
   bool do_not_prompt_for_login = false;
   bool is_main_frame = false;
   int transition_type = 0;
+  bool report_raw_headers = false;
   int previews_state = 0;
   bool upgrade_if_insecure = false;
   bool is_revalidating = false;
diff --git a/services/network/public/cpp/url_request_mojom_traits.cc b/services/network/public/cpp/url_request_mojom_traits.cc
index 6bd39133e2d5b2bbad9ccbbded1e41eddce2a424..05d40087e89ec1edabb6017931f0d9e54a467b78 100644
--- a/services/network/public/cpp/url_request_mojom_traits.cc
+++ b/services/network/public/cpp/url_request_mojom_traits.cc
@@ -198,6 +198,7 @@ bool StructTraits<
   out->do_not_prompt_for_login = data.do_not_prompt_for_login();
   out->is_main_frame = data.is_main_frame();
   out->transition_type = data.transition_type();
+  out->report_raw_headers = data.report_raw_headers();
   out->previews_state = data.previews_state();
   out->upgrade_if_insecure = data.upgrade_if_insecure();
   out->is_revalidating = data.is_revalidating();
diff --git a/services/network/public/cpp/url_request_mojom_traits.h b/services/network/public/cpp/url_request_mojom_traits.h
index 86e6558f3ebfb5d0f3dee3cee70fc45f0f33123f..54efb232bf7316ce3aabbb787676acb093910047 100644
--- a/services/network/public/cpp/url_request_mojom_traits.h
+++ b/services/network/public/cpp/url_request_mojom_traits.h
@@ -267,6 +267,9 @@ struct COMPONENT_EXPORT(NETWORK_CPP_BASE)
   static int32_t transition_type(const network::ResourceRequest& request) {
     return request.transition_type;
   }
+  static bool report_raw_headers(const network::ResourceRequest& request) {
+    return request.report_raw_headers;
+  }
   static int32_t previews_state(const network::ResourceRequest& request) {
     return request.previews_state;
   }
diff --git a/services/network/public/mojom/url_request.mojom b/services/network/public/mojom/url_request.mojom
index 6ad61365a1dac6c18609ed63e7ab992c8949e70c..039f27017521b94eb2768f949b7217a9102aa61c 100644
--- a/services/network/public/mojom/url_request.mojom
+++ b/services/network/public/mojom/url_request.mojom
@@ -313,6 +313,9 @@ struct URLRequest {
   // about this.
   int32 transition_type;
 
+  // Whether to provide unfiltered response headers.
+  bool report_raw_headers;
+
   // Whether or not to request a Preview version of the resource or let the
   // browser decide.
   // Note: this is an enum of type PreviewsState.
diff --git a/services/network/public/mojom/url_response_head.mojom b/services/network/public/mojom/url_response_head.mojom
index cea1fb864ab46b4b0eabf1db11a0392d6cd575c1..df033f65d50b088778268827e506963afebe0a23 100644
--- a/services/network/public/mojom/url_response_head.mojom
+++ b/services/network/public/mojom/url_response_head.mojom
@@ -7,6 +7,7 @@ module network.mojom;
 import "mojo/public/mojom/base/time.mojom";
 import "mojo/public/mojom/base/unguessable_token.mojom";
 import "services/network/public/mojom/fetch_api.mojom";
+import "services/network/public/mojom/http_raw_headers.mojom";
 import "services/network/public/mojom/ip_endpoint.mojom";
 import "services/network/public/mojom/load_timing_info.mojom";
 import "services/network/public/mojom/network_param.mojom";
@@ -28,6 +29,9 @@ struct URLResponseHead {
   // The response headers or NULL if the URL type does not support headers.
   HttpResponseHeaders headers;
 
+  // Actual response headers, as obtained from the network stack.
+  array<HttpRawHeaderPair> raw_response_headers;
+
   // The mime type of the response.  This may be a derived value.
   string mime_type;
 
diff --git a/services/network/url_loader.cc b/services/network/url_loader.cc
index 136427ff144f7ce23674f2b18e7deac5f5a5c8dd..94212b48f0a31de898f351c824b289c8c8e4dfad 100644
--- a/services/network/url_loader.cc
+++ b/services/network/url_loader.cc
@@ -526,6 +526,7 @@ URLLoader::URLLoader(
       peer_closed_handle_watcher_(FROM_HERE,
                                   mojo::SimpleWatcher::ArmingPolicy::MANUAL,
                                   base::SequencedTaskRunnerHandle::Get()),
+      report_raw_headers_(request.report_raw_headers),
       devtools_request_id_(request.devtools_request_id),
       request_mode_(request.mode),
       request_credentials_mode_(request.credentials_mode),
@@ -669,7 +670,7 @@ URLLoader::URLLoader(
   url_request_->SetRequestHeadersCallback(base::BindRepeating(
       &URLLoader::SetRawRequestHeadersAndNotify, base::Unretained(this)));
 
-  if (devtools_request_id()) {
+  if (devtools_request_id() || report_raw_headers_) {
     url_request_->SetResponseHeadersCallback(base::BindRepeating(
         &URLLoader::SetRawResponseHeaders, base::Unretained(this)));
   }
@@ -1299,6 +1300,19 @@ void URLLoader::OnResponseStarted(net::URLRequest* url_request, int net_error) {
   response_ = network::mojom::URLResponseHead::New();
   PopulateResourceResponse(url_request_.get(), is_load_timing_enabled_,
                            options_, response_.get());
+  if (raw_response_headers_ && report_raw_headers_) {
+    std::vector<network::mojom::HttpRawHeaderPairPtr> header_array;
+    size_t iterator = 0;
+    std::string name, value;
+    while (raw_response_headers_->EnumerateHeaderLines(&iterator, &name, &value)) {
+      network::mojom::HttpRawHeaderPairPtr pair =
+          network::mojom::HttpRawHeaderPair::New();
+      pair->key = name;
+      pair->value = value;
+      header_array.push_back(std::move(pair));
+    }
+    response_->raw_response_headers = std::move(header_array);
+  }
 
   // Parse and remove the Trust Tokens response headers, if any are expected,
   // potentially failing the request if an error occurs.
diff --git a/services/network/url_loader.h b/services/network/url_loader.h
index f40ab2d8823e0b7f71b9ea7932d258022518e632..a36ab764380d542b060979763d20dbf65e1925b5 100644
--- a/services/network/url_loader.h
+++ b/services/network/url_loader.h
@@ -497,6 +497,8 @@ class COMPONENT_EXPORT(NETWORK_SERVICE) URLLoader
   std::unique_ptr<ResourceScheduler::ScheduledResourceRequest>
       resource_scheduler_request_handle_;
 
+  // Whether client requested raw headers.
+  bool report_raw_headers_ = false;
   bool enable_reporting_raw_headers_ = false;
   net::HttpRawRequestHeaders raw_request_headers_;
   scoped_refptr<const net::HttpResponseHeaders> raw_response_headers_;