content/browser/webui/url_data_manager_backend.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/webui/url_data_manager_backend.h"
   6
   7 #include <set>
   8
   9 #include "base/basictypes.h"
  10 #include "base/bind.h"
  11 #include "base/command_line.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/debug/alias.h"
  14 #include "base/lazy_instance.h"
  15 #include "base/memory/ref_counted.h"
  16 #include "base/memory/ref_counted_memory.h"
  17 #include "base/memory/weak_ptr.h"
  18 #include "base/message_loop/message_loop.h"
  19 #include "base/profiler/scoped_tracker.h"
  20 #include "base/strings/string_util.h"
  21 #include "base/strings/stringprintf.h"
  22 #include "base/trace_event/trace_event.h"
  23 #include "content/browser/appcache/view_appcache_internals_job.h"
  24 #include "content/browser/fileapi/chrome_blob_storage_context.h"
  25 #include "content/browser/histogram_internals_request_job.h"
  26 #include "content/browser/net/view_blob_internals_job_factory.h"
  27 #include "content/browser/net/view_http_cache_job_factory.h"
  28 #include "content/browser/resource_context_impl.h"
  29 #include "content/browser/tcmalloc_internals_request_job.h"
  30 #include "content/browser/webui/shared_resources_data_source.h"
  31 #include "content/browser/webui/url_data_source_impl.h"
  32 #include "content/public/browser/browser_context.h"
  33 #include "content/public/browser/browser_thread.h"
  34 #include "content/public/browser/content_browser_client.h"
  35 #include "content/public/browser/render_process_host.h"
  36 #include "content/public/browser/resource_request_info.h"
  37 #include "content/public/common/url_constants.h"
  38 #include "net/base/io_buffer.h"
  39 #include "net/base/net_errors.h"
  40 #include "net/http/http_response_headers.h"
  41 #include "net/http/http_status_code.h"
  42 #include "net/url_request/url_request.h"
  43 #include "net/url_request/url_request_context.h"
  44 #include "net/url_request/url_request_job.h"
  45 #include "net/url_request/url_request_job_factory.h"
  46 #include "url/url_util.h"
  47
  48 namespace content {
  49
  50 namespace {
  51
  52 // TODO(tsepez) remove unsafe-eval when bidichecker_packaged.js fixed.
  53 const char kChromeURLContentSecurityPolicyHeaderBase[] =
  54     "Content-Security-Policy: script-src chrome://resources "
  55     "'self' 'unsafe-eval'; ";
  56
  57 const char kChromeURLXFrameOptionsHeader[] = "X-Frame-Options: DENY";
  58
  59 const int kNoRenderProcessId = -1;
  60
  61 bool SchemeIsInSchemes(const std::string& scheme,
  62                        const std::vector<std::string>& schemes) {
  63   return std::find(schemes.begin(), schemes.end(), scheme) != schemes.end();
  64 }
  65
  66 // Returns whether |url| passes some sanity checks and is a valid GURL.
  67 bool CheckURLIsValid(const GURL& url) {
  68   std::vector<std::string> additional_schemes;
  69   DCHECK(url.SchemeIs(kChromeDevToolsScheme) || url.SchemeIs(kChromeUIScheme) ||
  70          (GetContentClient()->browser()->GetAdditionalWebUISchemes(
  71               &additional_schemes),
  72           SchemeIsInSchemes(url.scheme(), additional_schemes)));
  73
  74   if (!url.is_valid()) {
  75     NOTREACHED();
  76     return false;
  77   }
  78
  79   return true;
  80 }
  81
  82 // Parse |url| to get the path which will be used to resolve the request. The
  83 // path is the remaining portion after the scheme and hostname.
  84 void URLToRequestPath(const GURL& url, std::string* path) {
  85   const std::string& spec = url.possibly_invalid_spec();
  86   const url::Parsed& parsed = url.parsed_for_possibly_invalid_spec();
  87   // + 1 to skip the slash at the beginning of the path.
  88   int offset = parsed.CountCharactersBefore(url::Parsed::PATH, false) + 1;
  89
  90   if (offset < static_cast<int>(spec.size()))
  91     path->assign(spec.substr(offset));
  92 }
  93
  94 // Returns a value of 'Origin:' header for the |request| if the header is set.
  95 // Otherwise returns an empty string.
  96 std::string GetOriginHeaderValue(const net::URLRequest* request) {
  97   std::string result;
  98   if (request->extra_request_headers().GetHeader(
  99           net::HttpRequestHeaders::kOrigin, &result))
 100     return result;
 101   net::HttpRequestHeaders headers;
 102   if (request->GetFullRequestHeaders(&headers))
 103     headers.GetHeader(net::HttpRequestHeaders::kOrigin, &result);
 104   return result;
 105 }
 106
 107 }  // namespace
 108
 109 // URLRequestChromeJob is a net::URLRequestJob that manages running
 110 // chrome-internal resource requests asynchronously.
 111 // It hands off URL requests to ChromeURLDataManager, which asynchronously
 112 // calls back once the data is available.
 113 class URLRequestChromeJob : public net::URLRequestJob,
 114                             public base::SupportsWeakPtr<URLRequestChromeJob> {
 115  public:
 116   // |is_incognito| set when job is generated from an incognito profile.
 117   URLRequestChromeJob(net::URLRequest* request,
 118                       net::NetworkDelegate* network_delegate,
 119                       URLDataManagerBackend* backend,
 120                       bool is_incognito);
 121
 122   // net::URLRequestJob implementation.
 123   void Start() override;
 124   void Kill() override;
 125   bool ReadRawData(net::IOBuffer* buf, int buf_size, int* bytes_read) override;
 126   bool GetMimeType(std::string* mime_type) const override;
 127   int GetResponseCode() const override;
 128   void GetResponseInfo(net::HttpResponseInfo* info) override;
 129
 130   // Used to notify that the requested data's |mime_type| is ready.
 131   void MimeTypeAvailable(const std::string& mime_type);
 132
 133   // Called by ChromeURLDataManager to notify us that the data blob is ready
 134   // for us.
 135   void DataAvailable(base::RefCountedMemory* bytes);
 136
 137   void set_mime_type(const std::string& mime_type) {
 138     mime_type_ = mime_type;
 139   }
 140
 141   void set_allow_caching(bool allow_caching) {
 142     allow_caching_ = allow_caching;
 143   }
 144
 145   void set_add_content_security_policy(bool add_content_security_policy) {
 146     add_content_security_policy_ = add_content_security_policy;
 147   }
 148
 149   void set_content_security_policy_object_source(
 150       const std::string& data) {
 151     content_security_policy_object_source_ = data;
 152   }
 153
 154   void set_content_security_policy_frame_source(
 155       const std::string& data) {
 156     content_security_policy_frame_source_ = data;
 157   }
 158
 159   void set_deny_xframe_options(bool deny_xframe_options) {
 160     deny_xframe_options_ = deny_xframe_options;
 161   }
 162
 163   void set_send_content_type_header(bool send_content_type_header) {
 164     send_content_type_header_ = send_content_type_header;
 165   }
 166
 167   void set_access_control_allow_origin(const std::string& value) {
 168     access_control_allow_origin_ = value;
 169   }
 170
 171   // Returns true when job was generated from an incognito profile.
 172   bool is_incognito() const {
 173     return is_incognito_;
 174   }
 175
 176  private:
 177   ~URLRequestChromeJob() override;
 178
 179   // Helper for Start(), to let us start asynchronously.
 180   // (This pattern is shared by most net::URLRequestJob implementations.)
 181   void StartAsync(bool allowed);
 182
 183   // Called on the UI thread to check if this request is allowed.
 184   static void CheckStoragePartitionMatches(
 185       int render_process_id,
 186       const GURL& url,
 187       const base::WeakPtr<URLRequestChromeJob>& job);
 188
 189   // Do the actual copy from data_ (the data we're serving) into |buf|.
 190   // Separate from ReadRawData so we can handle async I/O.
 191   void CompleteRead(net::IOBuffer* buf, int buf_size, int* bytes_read);
 192
 193   // The actual data we're serving.  NULL until it's been fetched.
 194   scoped_refptr<base::RefCountedMemory> data_;
 195   // The current offset into the data that we're handing off to our
 196   // callers via the Read interfaces.
 197   int data_offset_;
 198
 199   // For async reads, we keep around a pointer to the buffer that
 200   // we're reading into.
 201   scoped_refptr<net::IOBuffer> pending_buf_;
 202   int pending_buf_size_;
 203   std::string mime_type_;
 204
 205   // If true, set a header in the response to prevent it from being cached.
 206   bool allow_caching_;
 207
 208   // If true, set the Content Security Policy (CSP) header.
 209   bool add_content_security_policy_;
 210
 211   // These are used with the CSP.
 212   std::string content_security_policy_object_source_;
 213   std::string content_security_policy_frame_source_;
 214
 215   // If true, sets  the "X-Frame-Options: DENY" header.
 216   bool deny_xframe_options_;
 217
 218   // If true, sets the "Content-Type: <mime-type>" header.
 219   bool send_content_type_header_;
 220
 221   // If not empty, "Access-Control-Allow-Origin:" is set to the value of this
 222   // string.
 223   std::string access_control_allow_origin_;
 224
 225   // True when job is generated from an incognito profile.
 226   const bool is_incognito_;
 227
 228   // The backend is owned by net::URLRequestContext and always outlives us.
 229   URLDataManagerBackend* backend_;
 230
 231   base::WeakPtrFactory<URLRequestChromeJob> weak_factory_;
 232
 233   DISALLOW_COPY_AND_ASSIGN(URLRequestChromeJob);
 234 };
 235
 236 URLRequestChromeJob::URLRequestChromeJob(net::URLRequest* request,
 237                                          net::NetworkDelegate* network_delegate,
 238                                          URLDataManagerBackend* backend,
 239                                          bool is_incognito)
 240     : net::URLRequestJob(request, network_delegate),
 241       data_offset_(0),
 242       pending_buf_size_(0),
 243       allow_caching_(true),
 244       add_content_security_policy_(true),
 245       content_security_policy_object_source_("object-src 'none';"),
 246       content_security_policy_frame_source_("frame-src 'none';"),
 247       deny_xframe_options_(true),
 248       send_content_type_header_(false),
 249       is_incognito_(is_incognito),
 250       backend_(backend),
 251       weak_factory_(this) {
 252   DCHECK(backend);
 253 }
 254
 255 URLRequestChromeJob::~URLRequestChromeJob() {
 256   CHECK(!backend_->HasPendingJob(this));
 257 }
 258
 259 void URLRequestChromeJob::Start() {
 260   int render_process_id, unused;
 261   bool is_renderer_request = ResourceRequestInfo::GetRenderFrameForRequest(
 262       request_, &render_process_id, &unused);
 263   if (!is_renderer_request)
 264     render_process_id = kNoRenderProcessId;
 265   BrowserThread::PostTask(
 266       BrowserThread::UI,
 267       FROM_HERE,
 268       base::Bind(&URLRequestChromeJob::CheckStoragePartitionMatches,
 269                  render_process_id, request_->url(), AsWeakPtr()));
 270   TRACE_EVENT_ASYNC_BEGIN1("browser", "DataManager:Request", this, "URL",
 271       request_->url().possibly_invalid_spec());
 272 }
 273
 274 void URLRequestChromeJob::Kill() {
 275   backend_->RemoveRequest(this);
 276 }
 277
 278 bool URLRequestChromeJob::GetMimeType(std::string* mime_type) const {
 279   *mime_type = mime_type_;
 280   return !mime_type_.empty();
 281 }
 282
 283 int URLRequestChromeJob::GetResponseCode() const {
 284   return net::HTTP_OK;
 285 }
 286
 287 void URLRequestChromeJob::GetResponseInfo(net::HttpResponseInfo* info) {
 288   DCHECK(!info->headers.get());
 289   // Set the headers so that requests serviced by ChromeURLDataManager return a
 290   // status code of 200. Without this they return a 0, which makes the status
 291   // indistiguishable from other error types. Instant relies on getting a 200.
 292   info->headers = new net::HttpResponseHeaders("HTTP/1.1 200 OK");
 293
 294   // Determine the least-privileged content security policy header, if any,
 295   // that is compatible with a given WebUI URL, and append it to the existing
 296   // response headers.
 297   if (add_content_security_policy_) {
 298     std::string base = kChromeURLContentSecurityPolicyHeaderBase;
 299     base.append(content_security_policy_object_source_);
 300     base.append(content_security_policy_frame_source_);
 301     info->headers->AddHeader(base);
 302   }
 303
 304   if (deny_xframe_options_)
 305     info->headers->AddHeader(kChromeURLXFrameOptionsHeader);
 306
 307   if (!allow_caching_)
 308     info->headers->AddHeader("Cache-Control: no-cache");
 309
 310   if (send_content_type_header_ && !mime_type_.empty()) {
 311     std::string content_type =
 312         base::StringPrintf("%s:%s", net::HttpRequestHeaders::kContentType,
 313                            mime_type_.c_str());
 314     info->headers->AddHeader(content_type);
 315   }
 316
 317   if (!access_control_allow_origin_.empty()) {
 318     info->headers->AddHeader("Access-Control-Allow-Origin: " +
 319                              access_control_allow_origin_);
 320     info->headers->AddHeader("Vary: Origin");
 321   }
 322 }
 323
 324 void URLRequestChromeJob::MimeTypeAvailable(const std::string& mime_type) {
 325   set_mime_type(mime_type);
 326   NotifyHeadersComplete();
 327 }
 328
 329 void URLRequestChromeJob::DataAvailable(base::RefCountedMemory* bytes) {
 330   TRACE_EVENT_ASYNC_END0("browser", "DataManager:Request", this);
 331   if (bytes) {
 332     // The request completed, and we have all the data.
 333     // Clear any IO pending status.
 334     SetStatus(net::URLRequestStatus());
 335
 336     data_ = bytes;
 337     int bytes_read;
 338     if (pending_buf_.get()) {
 339       CHECK(pending_buf_->data());
 340       CompleteRead(pending_buf_.get(), pending_buf_size_, &bytes_read);
 341       pending_buf_ = NULL;
 342       NotifyReadComplete(bytes_read);
 343     }
 344   } else {
 345     // The request failed.
 346     NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
 347                                      net::ERR_FAILED));
 348   }
 349 }
 350
 351 bool URLRequestChromeJob::ReadRawData(net::IOBuffer* buf, int buf_size,
 352                                       int* bytes_read) {
 353   if (!data_.get()) {
 354     SetStatus(net::URLRequestStatus(net::URLRequestStatus::IO_PENDING, 0));
 355     DCHECK(!pending_buf_.get());
 356     CHECK(buf->data());
 357     pending_buf_ = buf;
 358     pending_buf_size_ = buf_size;
 359     return false;  // Tell the caller we're still waiting for data.
 360   }
 361
 362   // Otherwise, the data is available.
 363   CompleteRead(buf, buf_size, bytes_read);
 364   return true;
 365 }
 366
 367 void URLRequestChromeJob::CompleteRead(net::IOBuffer* buf, int buf_size,
 368                                        int* bytes_read) {
 369   int remaining = static_cast<int>(data_->size()) - data_offset_;
 370   if (buf_size > remaining)
 371     buf_size = remaining;
 372   if (buf_size > 0) {
 373     // TODO(pkasting): Remove ScopedTracker below once crbug.com/455423 is
 374     // fixed.
 375     tracked_objects::ScopedTracker tracking_profile(
 376         FROM_HERE_WITH_EXPLICIT_FUNCTION(
 377             "455423 URLRequestChromeJob::CompleteRead memcpy"));
 378     memcpy(buf->data(), data_->front() + data_offset_, buf_size);
 379     data_offset_ += buf_size;
 380   }
 381   *bytes_read = buf_size;
 382 }
 383
 384 void URLRequestChromeJob::CheckStoragePartitionMatches(
 385     int render_process_id,
 386     const GURL& url,
 387     const base::WeakPtr<URLRequestChromeJob>& job) {
 388   // The embedder could put some webui pages in separate storage partition.
 389   // RenderProcessHostImpl::IsSuitableHost would guard against top level pages
 390   // being in the same process. We do an extra check to guard against an
 391   // exploited renderer pretending to add them as a subframe. We skip this check
 392   // for resources.
 393   bool allowed = false;
 394   std::vector<std::string> hosts;
 395   GetContentClient()->
 396       browser()->GetAdditionalWebUIHostsToIgnoreParititionCheck(&hosts);
 397   if (url.SchemeIs(kChromeUIScheme) &&
 398       (url.SchemeIs(kChromeUIScheme) ||
 399        std::find(hosts.begin(), hosts.end(), url.host()) != hosts.end())) {
 400     allowed = true;
 401   } else if (render_process_id == kNoRenderProcessId) {
 402     // Request was not issued by renderer.
 403     allowed = true;
 404   } else {
 405     RenderProcessHost* process = RenderProcessHost::FromID(render_process_id);
 406     if (process) {
 407       StoragePartition* partition = BrowserContext::GetStoragePartitionForSite(
 408           process->GetBrowserContext(), url);
 409       allowed = partition == process->GetStoragePartition();
 410     }
 411   }
 412
 413   BrowserThread::PostTask(
 414       BrowserThread::IO,
 415       FROM_HERE,
 416       base::Bind(&URLRequestChromeJob::StartAsync, job, allowed));
 417 }
 418
 419 void URLRequestChromeJob::StartAsync(bool allowed) {
 420   if (!request_)
 421     return;
 422
 423   if (!allowed || !backend_->StartRequest(request_, this)) {
 424     NotifyStartError(net::URLRequestStatus(net::URLRequestStatus::FAILED,
 425                                            net::ERR_INVALID_URL));
 426   }
 427 }
 428
 429 namespace {
 430
 431 // Gets mime type for data that is available from |source| by |path|.
 432 // After that, notifies |job| that mime type is available. This method
 433 // should be called on the UI thread, but notification is performed on
 434 // the IO thread.
 435 void GetMimeTypeOnUI(URLDataSourceImpl* source,
 436                      const std::string& path,
 437                      const base::WeakPtr<URLRequestChromeJob>& job) {
 438   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 439   std::string mime_type = source->source()->GetMimeType(path);
 440   BrowserThread::PostTask(
 441       BrowserThread::IO, FROM_HERE,
 442       base::Bind(&URLRequestChromeJob::MimeTypeAvailable, job, mime_type));
 443 }
 444
 445 }  // namespace
 446
 447 namespace {
 448
 449 class ChromeProtocolHandler
 450     : public net::URLRequestJobFactory::ProtocolHandler {
 451  public:
 452   // |is_incognito| should be set for incognito profiles.
 453   ChromeProtocolHandler(ResourceContext* resource_context,
 454                         bool is_incognito,
 455                         AppCacheServiceImpl* appcache_service,
 456                         ChromeBlobStorageContext* blob_storage_context)
 457       : resource_context_(resource_context),
 458         is_incognito_(is_incognito),
 459         appcache_service_(appcache_service),
 460         blob_storage_context_(blob_storage_context) {}
 461   ~ChromeProtocolHandler() override {}
 462
 463   net::URLRequestJob* MaybeCreateJob(
 464       net::URLRequest* request,
 465       net::NetworkDelegate* network_delegate) const override {
 466     DCHECK(request);
 467
 468     // Check for chrome://view-http-cache/*, which uses its own job type.
 469     if (ViewHttpCacheJobFactory::IsSupportedURL(request->url()))
 470       return ViewHttpCacheJobFactory::CreateJobForRequest(request,
 471                                                           network_delegate);
 472
 473     // Next check for chrome://appcache-internals/, which uses its own job type.
 474     if (request->url().SchemeIs(kChromeUIScheme) &&
 475         request->url().host() == kChromeUIAppCacheInternalsHost) {
 476       return ViewAppCacheInternalsJobFactory::CreateJobForRequest(
 477           request, network_delegate, appcache_service_);
 478     }
 479
 480     // Next check for chrome://blob-internals/, which uses its own job type.
 481     if (ViewBlobInternalsJobFactory::IsSupportedURL(request->url())) {
 482       return ViewBlobInternalsJobFactory::CreateJobForRequest(
 483           request, network_delegate, blob_storage_context_->context());
 484     }
 485
 486 #if defined(USE_TCMALLOC)
 487     // Next check for chrome://tcmalloc/, which uses its own job type.
 488     if (request->url().SchemeIs(kChromeUIScheme) &&
 489         request->url().host() == kChromeUITcmallocHost) {
 490       return new TcmallocInternalsRequestJob(request, network_delegate);
 491     }
 492 #endif
 493
 494     // Next check for chrome://histograms/, which uses its own job type.
 495     if (request->url().SchemeIs(kChromeUIScheme) &&
 496         request->url().host() == kChromeUIHistogramHost) {
 497       return new HistogramInternalsRequestJob(request, network_delegate);
 498     }
 499
 500     // Fall back to using a custom handler
 501     return new URLRequestChromeJob(
 502         request, network_delegate,
 503         GetURLDataManagerForResourceContext(resource_context_), is_incognito_);
 504   }
 505
 506   bool IsSafeRedirectTarget(const GURL& location) const override {
 507     return false;
 508   }
 509
 510  private:
 511   // These members are owned by ProfileIOData, which owns this ProtocolHandler.
 512   content::ResourceContext* const resource_context_;
 513
 514   // True when generated from an incognito profile.
 515   const bool is_incognito_;
 516   AppCacheServiceImpl* appcache_service_;
 517   ChromeBlobStorageContext* blob_storage_context_;
 518
 519   DISALLOW_COPY_AND_ASSIGN(ChromeProtocolHandler);
 520 };
 521
 522 }  // namespace
 523
 524 URLDataManagerBackend::URLDataManagerBackend()
 525     : next_request_id_(0) {
 526   URLDataSource* shared_source = new SharedResourcesDataSource();
 527   URLDataSourceImpl* source_impl =
 528       new URLDataSourceImpl(shared_source->GetSource(), shared_source);
 529   AddDataSource(source_impl);
 530 }
 531
 532 URLDataManagerBackend::~URLDataManagerBackend() {
 533   for (DataSourceMap::iterator i = data_sources_.begin();
 534        i != data_sources_.end(); ++i) {
 535     i->second->backend_ = NULL;
 536   }
 537   data_sources_.clear();
 538 }
 539
 540 // static
 541 net::URLRequestJobFactory::ProtocolHandler*
 542 URLDataManagerBackend::CreateProtocolHandler(
 543     content::ResourceContext* resource_context,
 544     bool is_incognito,
 545     AppCacheServiceImpl* appcache_service,
 546     ChromeBlobStorageContext* blob_storage_context) {
 547   DCHECK(resource_context);
 548   return new ChromeProtocolHandler(
 549       resource_context, is_incognito, appcache_service, blob_storage_context);
 550 }
 551
 552 void URLDataManagerBackend::AddDataSource(
 553     URLDataSourceImpl* source) {
 554   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 555   DataSourceMap::iterator i = data_sources_.find(source->source_name());
 556   if (i != data_sources_.end()) {
 557     if (!source->source()->ShouldReplaceExistingSource())
 558       return;
 559     i->second->backend_ = NULL;
 560   }
 561   data_sources_[source->source_name()] = source;
 562   source->backend_ = this;
 563 }
 564
 565 bool URLDataManagerBackend::HasPendingJob(
 566     URLRequestChromeJob* job) const {
 567   for (PendingRequestMap::const_iterator i = pending_requests_.begin();
 568        i != pending_requests_.end(); ++i) {
 569     if (i->second == job)
 570       return true;
 571   }
 572   return false;
 573 }
 574
 575 bool URLDataManagerBackend::StartRequest(const net::URLRequest* request,
 576                                          URLRequestChromeJob* job) {
 577   if (!CheckURLIsValid(request->url()))
 578     return false;
 579
 580   URLDataSourceImpl* source = GetDataSourceFromURL(request->url());
 581   if (!source)
 582     return false;
 583
 584   if (!source->source()->ShouldServiceRequest(request))
 585     return false;
 586
 587   std::string path;
 588   URLToRequestPath(request->url(), &path);
 589   source->source()->WillServiceRequest(request, &path);
 590
 591   // Save this request so we know where to send the data.
 592   RequestID request_id = next_request_id_++;
 593   pending_requests_.insert(std::make_pair(request_id, job));
 594
 595   job->set_allow_caching(source->source()->AllowCaching());
 596   job->set_add_content_security_policy(
 597       source->source()->ShouldAddContentSecurityPolicy());
 598   job->set_content_security_policy_object_source(
 599       source->source()->GetContentSecurityPolicyObjectSrc());
 600   job->set_content_security_policy_frame_source(
 601       source->source()->GetContentSecurityPolicyFrameSrc());
 602   job->set_deny_xframe_options(
 603       source->source()->ShouldDenyXFrameOptions());
 604   job->set_send_content_type_header(
 605       source->source()->ShouldServeMimeTypeAsContentTypeHeader());
 606
 607   std::string origin = GetOriginHeaderValue(request);
 608   if (!origin.empty()) {
 609     std::string header =
 610         source->source()->GetAccessControlAllowOriginForOrigin(origin);
 611     DCHECK(header.empty() || header == origin || header == "*" ||
 612            header == "null");
 613     job->set_access_control_allow_origin(header);
 614   }
 615
 616   // Look up additional request info to pass down.
 617   int render_process_id = -1;
 618   int render_frame_id = -1;
 619   ResourceRequestInfo::GetRenderFrameForRequest(request,
 620                                                 &render_process_id,
 621                                                 &render_frame_id);
 622
 623   // Forward along the request to the data source.
 624   base::MessageLoop* target_message_loop =
 625       source->source()->MessageLoopForRequestPath(path);
 626   if (!target_message_loop) {
 627     job->MimeTypeAvailable(source->source()->GetMimeType(path));
 628     // Eliminate potentially dangling pointer to avoid future use.
 629     job = NULL;
 630
 631     // The DataSource is agnostic to which thread StartDataRequest is called
 632     // on for this path.  Call directly into it from this thread, the IO
 633     // thread.
 634     source->source()->StartDataRequest(
 635         path, render_process_id, render_frame_id,
 636         base::Bind(&URLDataSourceImpl::SendResponse, source, request_id));
 637   } else {
 638     // URLRequestChromeJob should receive mime type before data. This
 639     // is guaranteed because request for mime type is placed in the
 640     // message loop before request for data. And correspondingly their
 641     // replies are put on the IO thread in the same order.
 642     target_message_loop->PostTask(
 643         FROM_HERE,
 644         base::Bind(&GetMimeTypeOnUI,
 645                    scoped_refptr<URLDataSourceImpl>(source),
 646                    path, job->AsWeakPtr()));
 647
 648     // The DataSource wants StartDataRequest to be called on a specific thread,
 649     // usually the UI thread, for this path.
 650     target_message_loop->PostTask(
 651         FROM_HERE,
 652         base::Bind(&URLDataManagerBackend::CallStartRequest,
 653                    make_scoped_refptr(source), path, render_process_id,
 654                    render_frame_id, request_id));
 655   }
 656   return true;
 657 }
 658
 659 URLDataSourceImpl* URLDataManagerBackend::GetDataSourceFromURL(
 660     const GURL& url) {
 661   // The input usually looks like: chrome://source_name/extra_bits?foo
 662   // so do a lookup using the host of the URL.
 663   DataSourceMap::iterator i = data_sources_.find(url.host());
 664   if (i != data_sources_.end())
 665     return i->second.get();
 666
 667   // No match using the host of the URL, so do a lookup using the scheme for
 668   // URLs on the form source_name://extra_bits/foo .
 669   i = data_sources_.find(url.scheme() + "://");
 670   if (i != data_sources_.end())
 671     return i->second.get();
 672
 673   // No matches found, so give up.
 674   return NULL;
 675 }
 676
 677 void URLDataManagerBackend::CallStartRequest(
 678     scoped_refptr<URLDataSourceImpl> source,
 679     const std::string& path,
 680     int render_process_id,
 681     int render_frame_id,
 682     int request_id) {
 683   if (BrowserThread::CurrentlyOn(BrowserThread::UI) &&
 684       render_process_id != -1 &&
 685       !RenderProcessHost::FromID(render_process_id)) {
 686     // Make the request fail if its initiating renderer is no longer valid.
 687     // This can happen when the IO thread posts this task just before the
 688     // renderer shuts down.
 689     source->SendResponse(request_id, NULL);
 690     return;
 691   }
 692   source->source()->StartDataRequest(
 693       path,
 694       render_process_id,
 695       render_frame_id,
 696       base::Bind(&URLDataSourceImpl::SendResponse, source, request_id));
 697 }
 698
 699 void URLDataManagerBackend::RemoveRequest(URLRequestChromeJob* job) {
 700   // Remove the request from our list of pending requests.
 701   // If/when the source sends the data that was requested, the data will just
 702   // be thrown away.
 703   for (PendingRequestMap::iterator i = pending_requests_.begin();
 704        i != pending_requests_.end(); ++i) {
 705     if (i->second == job) {
 706       pending_requests_.erase(i);
 707       return;
 708     }
 709   }
 710 }
 711
 712 void URLDataManagerBackend::DataAvailable(RequestID request_id,
 713                                           base::RefCountedMemory* bytes) {
 714   // Forward this data on to the pending net::URLRequest, if it exists.
 715   PendingRequestMap::iterator i = pending_requests_.find(request_id);
 716   if (i != pending_requests_.end()) {
 717     URLRequestChromeJob* job = i->second;
 718     pending_requests_.erase(i);
 719     job->DataAvailable(bytes);
 720   }
 721 }
 722
 723 namespace {
 724
 725 class DevToolsJobFactory
 726     : public net::URLRequestJobFactory::ProtocolHandler {
 727  public:
 728   // |is_incognito| should be set for incognito profiles.
 729   DevToolsJobFactory(content::ResourceContext* resource_context,
 730                      bool is_incognito);
 731   ~DevToolsJobFactory() override;
 732
 733   net::URLRequestJob* MaybeCreateJob(
 734       net::URLRequest* request,
 735       net::NetworkDelegate* network_delegate) const override;
 736
 737  private:
 738   // |resource_context_| and |network_delegate_| are owned by ProfileIOData,
 739   // which owns this ProtocolHandler.
 740   content::ResourceContext* const resource_context_;
 741
 742   // True when generated from an incognito profile.
 743   const bool is_incognito_;
 744
 745   DISALLOW_COPY_AND_ASSIGN(DevToolsJobFactory);
 746 };
 747
 748 DevToolsJobFactory::DevToolsJobFactory(
 749     content::ResourceContext* resource_context,
 750     bool is_incognito)
 751     : resource_context_(resource_context),
 752       is_incognito_(is_incognito) {
 753   DCHECK(resource_context_);
 754 }
 755
 756 DevToolsJobFactory::~DevToolsJobFactory() {}
 757
 758 net::URLRequestJob*
 759 DevToolsJobFactory::MaybeCreateJob(
 760     net::URLRequest* request, net::NetworkDelegate* network_delegate) const {
 761   return new URLRequestChromeJob(
 762       request, network_delegate,
 763       GetURLDataManagerForResourceContext(resource_context_), is_incognito_);
 764 }
 765
 766 }  // namespace
 767
 768 net::URLRequestJobFactory::ProtocolHandler*
 769 CreateDevToolsProtocolHandler(content::ResourceContext* resource_context,
 770                               bool is_incognito) {
 771   return new DevToolsJobFactory(resource_context, is_incognito);
 772 }
 773
 774 }  // namespace content