7400e3d8fc
A website with a 4xx status code is still a valid website, we should not artificially hide it. In fact, many websites implement custom 404 error pages for example, often containing search functionality or links back to the homepage. This might have implications regarding the loading of stylesheets where the request 404s, but since we were not handling 5xx status codes as errors either, I think that's fine for now (but might need additional work later). Worst case, the parser rejects to load some error page HTML as CSS :^)
240 lines
8.8 KiB
C++
240 lines
8.8 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Base64.h>
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#include <AK/Debug.h>
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#include <AK/JsonObject.h>
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#include <LibCore/EventLoop.h>
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#include <LibCore/File.h>
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#include <LibProtocol/Client.h>
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#include <LibProtocol/Download.h>
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#include <LibWeb/Loader/ContentFilter.h>
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#include <LibWeb/Loader/LoadRequest.h>
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#include <LibWeb/Loader/Resource.h>
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#include <LibWeb/Loader/ResourceLoader.h>
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namespace Web {
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ResourceLoader& ResourceLoader::the()
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{
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static ResourceLoader* s_the;
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if (!s_the)
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s_the = &ResourceLoader::construct().leak_ref();
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return *s_the;
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}
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ResourceLoader::ResourceLoader()
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: m_protocol_client(Protocol::Client::construct())
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, m_user_agent(default_user_agent)
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{
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}
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void ResourceLoader::load_sync(const LoadRequest& request, Function<void(ReadonlyBytes, const HashMap<String, String, CaseInsensitiveStringTraits>& response_headers, Optional<u32> status_code)> success_callback, Function<void(const String&, Optional<u32> status_code)> error_callback)
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{
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Core::EventLoop loop;
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load(
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request,
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[&](auto data, auto& response_headers, auto status_code) {
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success_callback(data, response_headers, status_code);
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loop.quit(0);
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},
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[&](auto& string, auto status_code) {
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if (error_callback)
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error_callback(string, status_code);
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loop.quit(0);
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});
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loop.exec();
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}
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static HashMap<LoadRequest, NonnullRefPtr<Resource>> s_resource_cache;
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RefPtr<Resource> ResourceLoader::load_resource(Resource::Type type, const LoadRequest& request)
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{
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if (!request.is_valid())
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return nullptr;
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bool use_cache = request.url().protocol() != "file";
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if (use_cache) {
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auto it = s_resource_cache.find(request);
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if (it != s_resource_cache.end()) {
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if (it->value->type() != type) {
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dbgln("FIXME: Not using cached resource for {} since there's a type mismatch.", request.url());
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} else {
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dbgln_if(CACHE_DEBUG, "Reusing cached resource for: {}", request.url());
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return it->value;
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}
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}
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}
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auto resource = Resource::create({}, type, request);
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if (use_cache)
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s_resource_cache.set(request, resource);
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load(
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request,
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[=](auto data, auto& headers, auto status_code) {
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const_cast<Resource&>(*resource).did_load({}, data, headers, status_code);
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},
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[=](auto& error, auto status_code) {
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const_cast<Resource&>(*resource).did_fail({}, error, status_code);
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});
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return resource;
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}
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void ResourceLoader::load(const LoadRequest& request, Function<void(ReadonlyBytes, const HashMap<String, String, CaseInsensitiveStringTraits>& response_headers, Optional<u32> status_code)> success_callback, Function<void(const String&, Optional<u32> status_code)> error_callback)
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{
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auto& url = request.url();
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if (is_port_blocked(url.port())) {
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dbgln("ResourceLoader::load: Error: blocked port {} from URL {}", url.port(), url);
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return;
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}
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if (ContentFilter::the().is_filtered(url)) {
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dbgln("\033[32;1mResourceLoader::load: URL was filtered! {}\033[0m", url);
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error_callback("URL was filtered", {});
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return;
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}
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if (url.protocol() == "about") {
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dbgln("Loading about: URL {}", url);
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deferred_invoke([success_callback = move(success_callback)](auto&) {
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success_callback(String::empty().to_byte_buffer(), {}, {});
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});
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return;
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}
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if (url.protocol() == "data") {
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dbgln("ResourceLoader loading a data URL with mime-type: '{}', base64={}, payload='{}'",
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url.data_mime_type(),
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url.data_payload_is_base64(),
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url.data_payload());
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ByteBuffer data;
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if (url.data_payload_is_base64())
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data = decode_base64(url.data_payload());
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else
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data = url.data_payload().to_byte_buffer();
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deferred_invoke([data = move(data), success_callback = move(success_callback)](auto&) {
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success_callback(data, {}, {});
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});
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return;
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}
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if (url.protocol() == "file") {
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auto f = Core::File::construct();
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f->set_filename(url.path());
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if (!f->open(Core::IODevice::OpenMode::ReadOnly)) {
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dbgln("ResourceLoader::load: Error: {}", f->error_string());
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if (error_callback)
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error_callback(f->error_string(), {});
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return;
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}
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auto data = f->read_all();
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deferred_invoke([data = move(data), success_callback = move(success_callback)](auto&) {
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success_callback(data, {}, {});
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});
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return;
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}
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if (url.protocol() == "http" || url.protocol() == "https" || url.protocol() == "gemini") {
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HashMap<String, String> headers;
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headers.set("User-Agent", m_user_agent);
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headers.set("Accept-Encoding", "gzip, deflate");
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for (auto& it : request.headers()) {
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headers.set(it.key, it.value);
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}
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auto download = protocol_client().start_download(request.method(), url.to_string(), headers, request.body());
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if (!download) {
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if (error_callback)
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error_callback("Failed to initiate load", {});
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return;
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}
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download->on_buffered_download_finish = [this, success_callback = move(success_callback), error_callback = move(error_callback), download](bool success, auto, auto& response_headers, auto status_code, ReadonlyBytes payload) {
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--m_pending_loads;
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if (on_load_counter_change)
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on_load_counter_change();
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if (!success) {
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if (error_callback)
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error_callback("HTTP load failed", {});
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return;
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}
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deferred_invoke([download](auto&) {
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// Clear circular reference of `download` captured by copy
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const_cast<Protocol::Download&>(*download).on_buffered_download_finish = nullptr;
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});
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success_callback(payload, response_headers, status_code);
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};
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download->set_should_buffer_all_input(true);
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download->on_certificate_requested = []() -> Protocol::Download::CertificateAndKey {
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return {};
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};
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++m_pending_loads;
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if (on_load_counter_change)
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on_load_counter_change();
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return;
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}
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if (error_callback)
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error_callback(String::formatted("Protocol not implemented: {}", url.protocol()), {});
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}
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void ResourceLoader::load(const URL& url, Function<void(ReadonlyBytes, const HashMap<String, String, CaseInsensitiveStringTraits>& response_headers, Optional<u32> status_code)> success_callback, Function<void(const String&, Optional<u32> status_code)> error_callback)
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{
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LoadRequest request;
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request.set_url(url);
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load(request, move(success_callback), move(error_callback));
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}
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bool ResourceLoader::is_port_blocked(int port)
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{
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int ports[] { 1, 7, 9, 11, 13, 15, 17, 19, 20, 21, 22, 23, 25, 37, 42,
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43, 53, 77, 79, 87, 95, 101, 102, 103, 104, 109, 110, 111, 113,
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115, 117, 119, 123, 135, 139, 143, 179, 389, 465, 512, 513, 514,
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515, 526, 530, 531, 532, 540, 556, 563, 587, 601, 636, 993, 995,
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2049, 3659, 4045, 6000, 6379, 6665, 6666, 6667, 6668, 6669, 9000 };
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for (auto blocked_port : ports)
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if (port == blocked_port)
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return true;
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return false;
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}
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void ResourceLoader::clear_cache()
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{
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dbgln("Clearing {} items from ResourceLoader cache", s_resource_cache.size());
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s_resource_cache.clear();
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}
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}
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