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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/preloading/prefetch/no_state_prefetch/chrome_speculation_host_delegate.h"
#include <algorithm>
#include <vector>
#include "chrome/browser/preloading/prefetch/no_state_prefetch/no_state_prefetch_manager_factory.h"
#include "components/no_state_prefetch/browser/no_state_prefetch_handle.h"
#include "components/no_state_prefetch/browser/no_state_prefetch_manager.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/session_storage_namespace.h"
#include "content/public/browser/web_contents.h"
#include "ui/gfx/geometry/size.h"
#include "url/gurl.h"
#include "url/origin.h"
ChromeSpeculationHostDelegate::ChromeSpeculationHostDelegate(
content::RenderFrameHost& render_frame_host)
: render_frame_host_(render_frame_host) {}
ChromeSpeculationHostDelegate::~ChromeSpeculationHostDelegate() {
for (auto& prefetch : same_origin_no_state_prefetches_) {
prefetch->OnNavigateAway();
}
}
void ChromeSpeculationHostDelegate::ProcessCandidates(
std::vector<blink::mojom::SpeculationCandidatePtr>& candidates) {
auto* web_contents =
content::WebContents::FromRenderFrameHost(&*render_frame_host_);
// Same origin prefetches with subresources are handled by NSP.
std::vector<GURL> same_origin_prefetches_with_subresources;
const url::Origin& origin = render_frame_host_->GetLastCommittedOrigin();
// Returns true if the given entry is processed. Being processed means this
// delegate has a corresponding strategy to process the candidate, so it
// extracts the candidate's URL.
auto should_process_entry =
[&](const blink::mojom::SpeculationCandidatePtr& candidate) {
bool is_same_origin = origin.IsSameOriginWith(candidate->url);
if (!is_same_origin) {
return false;
}
if (candidate->action !=
blink::mojom::SpeculationAction::kPrefetchWithSubresources) {
return false;
}
same_origin_prefetches_with_subresources.push_back(candidate->url);
return true;
};
// Remove the entries that are to be processed by this delegate.
std::erase_if(candidates, should_process_entry);
if (same_origin_prefetches_with_subresources.size() > 0) {
prerender::NoStatePrefetchManager* no_state_prefetch_manager =
prerender::NoStatePrefetchManagerFactory::GetForBrowserContext(
render_frame_host_->GetBrowserContext());
if (!no_state_prefetch_manager) {
return;
}
content::SessionStorageNamespace* session_storage_namespace =
web_contents->GetController().GetDefaultSessionStorageNamespace();
gfx::Size size = web_contents->GetContainerBounds().size();
// The chrome implementation almost certainly only allows one NSP to start
// (500 ms limit), but treat all requests of this class as handled by
// chrome.
for (const auto& url : same_origin_prefetches_with_subresources) {
std::unique_ptr<prerender::NoStatePrefetchHandle> handle =
no_state_prefetch_manager->AddSameOriginSpeculation(
url, session_storage_namespace, size, origin);
if (handle) {
same_origin_no_state_prefetches_.push_back(std::move(handle));
}
}
}
}
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