net/test/url_request/url_request_mock_http_job.cc

// Copyright (c) 2012 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 "net/test/url_request/url_request_mock_http_job.h"

#include "base/files/file_util.h"
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task_runner_util.h"
#include "base/threading/sequenced_worker_pool.h"
#include "base/threading/thread_restrictions.h"
#include "net/base/filename_util.h"
#include "net/base/net_errors.h"
#include "net/base/url_util.h"
#include "net/http/http_response_headers.h"
#include "net/url_request/url_request_filter.h"
#include "net/url_request/url_request_interceptor.h"

namespace net {

namespace {

const char kMockHostname[] = "mock.http";
const base::FilePath::CharType kMockHeaderFileSuffix[] =
    FILE_PATH_LITERAL(".mock-http-headers");

class MockJobInterceptor : public URLRequestInterceptor {
 public:
  // When |map_all_requests_to_base_path| is true, all request should return the
  // contents of the file at |base_path|. When |map_all_requests_to_base_path|
  // is false, |base_path| is the file path leading to the root of the directory
  // to use as the root of the HTTP server.
  MockJobInterceptor(
      const base::FilePath& base_path,
      bool map_all_requests_to_base_path,
      const scoped_refptr<base::SequencedWorkerPool>& worker_pool)
      : base_path_(base_path),
        map_all_requests_to_base_path_(map_all_requests_to_base_path),
        worker_pool_(worker_pool) {}
  ~MockJobInterceptor() override {}

  // URLRequestJobFactory::ProtocolHandler implementation
  URLRequestJob* MaybeInterceptRequest(
      URLRequest* request,
      NetworkDelegate* network_delegate) const override {
    return new URLRequestMockHTTPJob(
        request,
        network_delegate,
        map_all_requests_to_base_path_ ? base_path_ : GetOnDiskPath(request),
        worker_pool_->GetTaskRunnerWithShutdownBehavior(
            base::SequencedWorkerPool::SKIP_ON_SHUTDOWN));
  }

 private:
  base::FilePath GetOnDiskPath(URLRequest* request) const {
    // Conceptually we just want to "return base_path_ + request->url().path()".
    // But path in the request URL is in URL space (i.e. %-encoded spaces).
    // So first we convert base FilePath to a URL, then append the URL
    // path to that, and convert the final URL back to a FilePath.
    GURL file_url(FilePathToFileURL(base_path_));
    std::string url = file_url.spec() + request->url().path();
    base::FilePath file_path;
    FileURLToFilePath(GURL(url), &file_path);
    return file_path;
  }

  const base::FilePath base_path_;
  const bool map_all_requests_to_base_path_;
  const scoped_refptr<base::SequencedWorkerPool> worker_pool_;

  DISALLOW_COPY_AND_ASSIGN(MockJobInterceptor);
};

std::string DoFileIO(const base::FilePath& file_path) {
  base::FilePath header_file =
      base::FilePath(file_path.value() + kMockHeaderFileSuffix);

  if (!base::PathExists(header_file)) {
    // If there is no mock-http-headers file, fake a 200 OK.
    return "HTTP/1.0 200 OK\n";
  }

  std::string raw_headers;
  base::ReadFileToString(header_file, &raw_headers);
  return raw_headers;
}

// For a given file |path| and |scheme|, return the URL served by the
// URlRequestMockHTTPJob.
GURL GetMockUrlForScheme(const std::string& path, const std::string& scheme) {
  return GURL(scheme + "://" + kMockHostname + "/" + path);
}

}  // namespace

// static
void URLRequestMockHTTPJob::AddUrlHandlers(
    const base::FilePath& base_path,
    const scoped_refptr<base::SequencedWorkerPool>& worker_pool) {
  // Add kMockHostname to URLRequestFilter, for both HTTP and HTTPS.
  URLRequestFilter* filter = URLRequestFilter::GetInstance();
  filter->AddHostnameInterceptor(
      "http", kMockHostname, CreateInterceptor(base_path, worker_pool));
  filter->AddHostnameInterceptor("https", kMockHostname,
                                 CreateInterceptor(base_path, worker_pool));
}

// static
GURL URLRequestMockHTTPJob::GetMockUrl(const std::string& path) {
  return GetMockUrlForScheme(path, "http");
}

// static
GURL URLRequestMockHTTPJob::GetMockHttpsUrl(const std::string& path) {
  return GetMockUrlForScheme(path, "https");
}

// static
std::unique_ptr<URLRequestInterceptor> URLRequestMockHTTPJob::CreateInterceptor(
    const base::FilePath& base_path,
    const scoped_refptr<base::SequencedWorkerPool>& worker_pool) {
  return std::unique_ptr<URLRequestInterceptor>(
      new MockJobInterceptor(base_path, false, worker_pool));
}

// static
std::unique_ptr<URLRequestInterceptor>
URLRequestMockHTTPJob::CreateInterceptorForSingleFile(
    const base::FilePath& file,
    const scoped_refptr<base::SequencedWorkerPool>& worker_pool) {
  return std::unique_ptr<URLRequestInterceptor>(
      new MockJobInterceptor(file, true, worker_pool));
}

URLRequestMockHTTPJob::URLRequestMockHTTPJob(
    URLRequest* request,
    NetworkDelegate* network_delegate,
    const base::FilePath& file_path,
    const scoped_refptr<base::TaskRunner>& task_runner)
    : URLRequestFileJob(request, network_delegate, file_path, task_runner),
      task_runner_(task_runner),
      weak_ptr_factory_(this) {
}

URLRequestMockHTTPJob::~URLRequestMockHTTPJob() {
}

// Public virtual version.
void URLRequestMockHTTPJob::GetResponseInfo(HttpResponseInfo* info) {
  // Forward to private const version.
  GetResponseInfoConst(info);
}

bool URLRequestMockHTTPJob::IsRedirectResponse(GURL* location,
                                               int* http_status_code) {
  // Override the URLRequestFileJob implementation to invoke the default
  // one based on HttpResponseInfo.
  return URLRequestJob::IsRedirectResponse(location, http_status_code);
}

void URLRequestMockHTTPJob::OnReadComplete(net::IOBuffer* buffer, int result) {
  if (result >= 0)
    total_received_bytes_ += result;
}

// Public virtual version.
void URLRequestMockHTTPJob::Start() {
  base::PostTaskAndReplyWithResult(
      task_runner_.get(),
      FROM_HERE,
      base::Bind(&DoFileIO, file_path_),
      base::Bind(&URLRequestMockHTTPJob::SetHeadersAndStart,
                 weak_ptr_factory_.GetWeakPtr()));
}

void URLRequestMockHTTPJob::SetHeadersAndStart(const std::string& raw_headers) {
  raw_headers_ = raw_headers;
  // Handle CRLF line-endings.
  base::ReplaceSubstringsAfterOffset(&raw_headers_, 0, "\r\n", "\n");
  // ParseRawHeaders expects \0 to end each header line.
  base::ReplaceSubstringsAfterOffset(
      &raw_headers_, 0, "\n", base::StringPiece("\0", 1));
  URLRequestFileJob::Start();
}

// Private const version.
void URLRequestMockHTTPJob::GetResponseInfoConst(HttpResponseInfo* info) const {
  info->headers = new HttpResponseHeaders(raw_headers_);
}

int64_t URLRequestMockHTTPJob::GetTotalReceivedBytes() const {
  return total_received_bytes_;
}

bool URLRequestMockHTTPJob::GetMimeType(std::string* mime_type) const {
  HttpResponseInfo info;
  GetResponseInfoConst(&info);
  return info.headers.get() && info.headers->GetMimeType(mime_type);
}

int URLRequestMockHTTPJob::GetResponseCode() const {
  HttpResponseInfo info;
  GetResponseInfoConst(&info);
  // If we have headers, get the response code from them.
  if (info.headers.get())
    return info.headers->response_code();
  return URLRequestJob::GetResponseCode();
}

bool URLRequestMockHTTPJob::GetCharset(std::string* charset) {
  HttpResponseInfo info;
  GetResponseInfo(&info);
  return info.headers.get() && info.headers->GetCharset(charset);
}

}  // namespace net