content/browser/appcache/view_appcache_internals_job.cc

   1 // Copyright 2014 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/appcache/view_appcache_internals_job.h"
   6
   7 #include <algorithm>
   8 #include <string>
   9
  10 #include "base/base64.h"
  11 #include "base/bind.h"
  12 #include "base/format_macros.h"
  13 #include "base/i18n/time_formatting.h"
  14 #include "base/logging.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/strings/string_util.h"
  18 #include "base/strings/stringprintf.h"
  19 #include "base/strings/utf_string_conversions.h"
  20 #include "content/browser/appcache/appcache.h"
  21 #include "content/browser/appcache/appcache_group.h"
  22 #include "content/browser/appcache/appcache_policy.h"
  23 #include "content/browser/appcache/appcache_response.h"
  24 #include "content/browser/appcache/appcache_service_impl.h"
  25 #include "content/browser/appcache/appcache_storage.h"
  26 #include "net/base/escape.h"
  27 #include "net/base/io_buffer.h"
  28 #include "net/base/net_errors.h"
  29 #include "net/http/http_response_headers.h"
  30 #include "net/url_request/url_request.h"
  31 #include "net/url_request/url_request_simple_job.h"
  32 #include "net/url_request/view_cache_helper.h"
  33
  34 namespace content {
  35 namespace {
  36
  37 const char kErrorMessage[] = "Error in retrieving Application Caches.";
  38 const char kEmptyAppCachesMessage[] = "No available Application Caches.";
  39 const char kManifestNotFoundMessage[] = "Manifest not found.";
  40 const char kManifest[] = "Manifest: ";
  41 const char kSize[] = "Size: ";
  42 const char kCreationTime[] = "Creation Time: ";
  43 const char kLastAccessTime[] = "Last Access Time: ";
  44 const char kLastUpdateTime[] = "Last Update Time: ";
  45 const char kFormattedDisabledAppCacheMsg[] =
  46     "<b><i><font color=\"FF0000\">"
  47     "This Application Cache is disabled by policy.</font></i></b><br/>";
  48 const char kRemoveCacheLabel[] = "Remove";
  49 const char kViewCacheLabel[] = "View Entries";
  50 const char kRemoveCacheCommand[] = "remove-cache";
  51 const char kViewCacheCommand[] = "view-cache";
  52 const char kViewEntryCommand[] = "view-entry";
  53
  54 void EmitPageStart(std::string* out) {
  55   out->append(
  56       "<!DOCTYPE HTML>\n"
  57       "<html><title>AppCache Internals</title>\n"
  58       "<meta http-equiv=\"Content-Security-Policy\""
  59       "  content=\"object-src 'none'; script-src 'none'\">\n"
  60       "<style>\n"
  61       "body { font-family: sans-serif; font-size: 0.8em; }\n"
  62       "tt, code, pre { font-family: WebKitHack, monospace; }\n"
  63       "form { display: inline; }\n"
  64       ".subsection_body { margin: 10px 0 10px 2em; }\n"
  65       ".subsection_title { font-weight: bold; }\n"
  66       "</style>\n"
  67       "</head><body>\n");
  68 }
  69
  70 void EmitPageEnd(std::string* out) {
  71   out->append("</body></html>\n");
  72 }
  73
  74 void EmitListItem(const std::string& label,
  75                   const std::string& data,
  76                   std::string* out) {
  77   out->append("<li>");
  78   out->append(net::EscapeForHTML(label));
  79   out->append(net::EscapeForHTML(data));
  80   out->append("</li>\n");
  81 }
  82
  83 void EmitAnchor(const std::string& url, const std::string& text,
  84                 std::string* out) {
  85   out->append("<a href=\"");
  86   out->append(net::EscapeForHTML(url));
  87   out->append("\">");
  88   out->append(net::EscapeForHTML(text));
  89   out->append("</a>");
  90 }
  91
  92 void EmitCommandAnchor(const char* label,
  93                        const GURL& base_url,
  94                        const char* command,
  95                        const char* param,
  96                        std::string* out) {
  97   std::string query(command);
  98   query.push_back('=');
  99   query.append(param);
 100   GURL::Replacements replacements;
 101   replacements.SetQuery(query.data(), url::Component(0, query.length()));
 102   GURL command_url = base_url.ReplaceComponents(replacements);
 103   EmitAnchor(command_url.spec(), label, out);
 104 }
 105
 106 void EmitAppCacheInfo(const GURL& base_url,
 107                       AppCacheServiceImpl* service,
 108                       const AppCacheInfo* info,
 109                       std::string* out) {
 110   std::string manifest_url_base64;
 111   base::Base64Encode(info->manifest_url.spec(), &manifest_url_base64);
 112
 113   out->append("\n<p>");
 114   out->append(kManifest);
 115   EmitAnchor(info->manifest_url.spec(), info->manifest_url.spec(), out);
 116   out->append("<br/>\n");
 117   if (!service->appcache_policy()->CanLoadAppCache(
 118           info->manifest_url, info->manifest_url)) {
 119     out->append(kFormattedDisabledAppCacheMsg);
 120   }
 121   out->append("\n<br/>\n");
 122   EmitCommandAnchor(kRemoveCacheLabel, base_url,
 123                     kRemoveCacheCommand, manifest_url_base64.c_str(), out);
 124   out->append("&nbsp;&nbsp;");
 125   EmitCommandAnchor(kViewCacheLabel, base_url,
 126                     kViewCacheCommand, manifest_url_base64.c_str(), out);
 127   out->append("\n<br/>\n");
 128   out->append("<ul>");
 129   EmitListItem(
 130       kSize,
 131       base::UTF16ToUTF8(FormatBytesUnlocalized(info->size)),
 132       out);
 133   EmitListItem(
 134       kCreationTime,
 135       base::UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->creation_time)),
 136       out);
 137   EmitListItem(
 138       kLastUpdateTime,
 139       base::UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->last_update_time)),
 140       out);
 141   EmitListItem(
 142       kLastAccessTime,
 143       base::UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->last_access_time)),
 144       out);
 145   out->append("</ul></p></br>\n");
 146 }
 147
 148 void EmitAppCacheInfoVector(
 149     const GURL& base_url,
 150     AppCacheServiceImpl* service,
 151     const AppCacheInfoVector& appcaches,
 152     std::string* out) {
 153   for (std::vector<AppCacheInfo>::const_iterator info =
 154            appcaches.begin();
 155        info != appcaches.end(); ++info) {
 156     EmitAppCacheInfo(base_url, service, &(*info), out);
 157   }
 158 }
 159
 160 void EmitTableData(const std::string& data, bool align_right, bool bold,
 161                    std::string* out) {
 162   if (align_right)
 163     out->append("<td align='right'>");
 164   else
 165     out->append("<td>");
 166   if (bold)
 167     out->append("<b>");
 168   out->append(data);
 169   if (bold)
 170     out->append("</b>");
 171   out->append("</td>");
 172 }
 173
 174 std::string FormFlagsString(const AppCacheResourceInfo& info) {
 175   std::string str;
 176   if (info.is_manifest)
 177     str.append("Manifest, ");
 178   if (info.is_master)
 179     str.append("Master, ");
 180   if (info.is_intercept)
 181     str.append("Intercept, ");
 182   if (info.is_fallback)
 183     str.append("Fallback, ");
 184   if (info.is_explicit)
 185     str.append("Explicit, ");
 186   if (info.is_foreign)
 187     str.append("Foreign, ");
 188   return str;
 189 }
 190
 191 std::string FormViewEntryAnchor(const GURL& base_url,
 192                                 const GURL& manifest_url, const GURL& entry_url,
 193                                 int64 response_id,
 194                                 int64 group_id) {
 195   std::string manifest_url_base64;
 196   std::string entry_url_base64;
 197   std::string response_id_string;
 198   std::string group_id_string;
 199   base::Base64Encode(manifest_url.spec(), &manifest_url_base64);
 200   base::Base64Encode(entry_url.spec(), &entry_url_base64);
 201   response_id_string = base::Int64ToString(response_id);
 202   group_id_string = base::Int64ToString(group_id);
 203
 204   std::string query(kViewEntryCommand);
 205   query.push_back('=');
 206   query.append(manifest_url_base64);
 207   query.push_back('|');
 208   query.append(entry_url_base64);
 209   query.push_back('|');
 210   query.append(response_id_string);
 211   query.push_back('|');
 212   query.append(group_id_string);
 213
 214   GURL::Replacements replacements;
 215   replacements.SetQuery(query.data(), url::Component(0, query.length()));
 216   GURL view_entry_url = base_url.ReplaceComponents(replacements);
 217
 218   std::string anchor;
 219   EmitAnchor(view_entry_url.spec(), entry_url.spec(), &anchor);
 220   return anchor;
 221 }
 222
 223 void EmitAppCacheResourceInfoVector(
 224     const GURL& base_url,
 225     const GURL& manifest_url,
 226     const AppCacheResourceInfoVector& resource_infos,
 227     int64 group_id,
 228     std::string* out) {
 229   out->append("<table border='0'>\n");
 230   out->append("<tr>");
 231   EmitTableData("Flags", false, true, out);
 232   EmitTableData("URL", false, true, out);
 233   EmitTableData("Size (headers and data)", true, true, out);
 234   out->append("</tr>\n");
 235   for (AppCacheResourceInfoVector::const_iterator
 236           iter = resource_infos.begin();
 237        iter != resource_infos.end(); ++iter) {
 238     out->append("<tr>");
 239     EmitTableData(FormFlagsString(*iter), false, false, out);
 240     EmitTableData(FormViewEntryAnchor(base_url, manifest_url,
 241                                       iter->url, iter->response_id,
 242                                       group_id),
 243                   false, false, out);
 244     EmitTableData(base::UTF16ToUTF8(FormatBytesUnlocalized(iter->size)),
 245                   true, false, out);
 246     out->append("</tr>\n");
 247   }
 248   out->append("</table>\n");
 249 }
 250
 251 void EmitResponseHeaders(net::HttpResponseHeaders* headers, std::string* out) {
 252   out->append("<hr><pre>");
 253   out->append(net::EscapeForHTML(headers->GetStatusLine()));
 254   out->push_back('\n');
 255
 256   void* iter = NULL;
 257   std::string name, value;
 258   while (headers->EnumerateHeaderLines(&iter, &name, &value)) {
 259     out->append(net::EscapeForHTML(name));
 260     out->append(": ");
 261     out->append(net::EscapeForHTML(value));
 262     out->push_back('\n');
 263   }
 264   out->append("</pre>");
 265 }
 266
 267 void EmitHexDump(const char *buf, size_t buf_len, size_t total_len,
 268                  std::string* out) {
 269   out->append("<hr><pre>");
 270   base::StringAppendF(out, "Showing %d of %d bytes\n\n",
 271                       static_cast<int>(buf_len), static_cast<int>(total_len));
 272   net::ViewCacheHelper::HexDump(buf, buf_len, out);
 273   if (buf_len < total_len)
 274     out->append("\nNote: data is truncated...");
 275   out->append("</pre>");
 276 }
 277
 278 GURL DecodeBase64URL(const std::string& base64) {
 279   std::string url;
 280   base::Base64Decode(base64, &url);
 281   return GURL(url);
 282 }
 283
 284 bool ParseQuery(const std::string& query,
 285                 std::string* command, std::string* value) {
 286   size_t position = query.find("=");
 287   if (position == std::string::npos)
 288     return false;
 289   *command = query.substr(0, position);
 290   *value = query.substr(position + 1);
 291   return !command->empty() && !value->empty();
 292 }
 293
 294 bool SortByManifestUrl(const AppCacheInfo& lhs,
 295                        const AppCacheInfo& rhs) {
 296   return lhs.manifest_url.spec() < rhs.manifest_url.spec();
 297 }
 298
 299 bool SortByResourceUrl(const AppCacheResourceInfo& lhs,
 300                        const AppCacheResourceInfo& rhs) {
 301   return lhs.url.spec() < rhs.url.spec();
 302 }
 303
 304 GURL ClearQuery(const GURL& url) {
 305   GURL::Replacements replacements;
 306   replacements.ClearQuery();
 307   return url.ReplaceComponents(replacements);
 308 }
 309
 310 // Simple base class for the job subclasses defined here.
 311 class BaseInternalsJob : public net::URLRequestSimpleJob,
 312                          public AppCacheServiceImpl::Observer {
 313  protected:
 314   BaseInternalsJob(net::URLRequest* request,
 315                    net::NetworkDelegate* network_delegate,
 316                    AppCacheServiceImpl* service)
 317       : URLRequestSimpleJob(request, network_delegate),
 318         appcache_service_(service),
 319         appcache_storage_(service->storage()) {
 320     appcache_service_->AddObserver(this);
 321   }
 322
 323   ~BaseInternalsJob() override { appcache_service_->RemoveObserver(this); }
 324
 325   void OnServiceReinitialized(
 326       AppCacheStorageReference* old_storage_ref) override {
 327     if (old_storage_ref->storage() == appcache_storage_)
 328       disabled_storage_reference_ = old_storage_ref;
 329   }
 330
 331   AppCacheServiceImpl* appcache_service_;
 332   AppCacheStorage* appcache_storage_;
 333   scoped_refptr<AppCacheStorageReference> disabled_storage_reference_;
 334 };
 335
 336 // Job that lists all appcaches in the system.
 337 class MainPageJob : public BaseInternalsJob {
 338  public:
 339   MainPageJob(net::URLRequest* request,
 340               net::NetworkDelegate* network_delegate,
 341               AppCacheServiceImpl* service)
 342       : BaseInternalsJob(request, network_delegate, service),
 343         weak_factory_(this) {
 344   }
 345
 346   void Start() override {
 347     DCHECK(request_);
 348     info_collection_ = new AppCacheInfoCollection;
 349     appcache_service_->GetAllAppCacheInfo(
 350         info_collection_.get(),
 351         base::Bind(&MainPageJob::OnGotInfoComplete,
 352                    weak_factory_.GetWeakPtr()));
 353   }
 354
 355   // Produces a page containing the listing
 356   int GetData(std::string* mime_type,
 357               std::string* charset,
 358               std::string* out,
 359               const net::CompletionCallback& callback) const override {
 360     mime_type->assign("text/html");
 361     charset->assign("UTF-8");
 362
 363     out->clear();
 364     EmitPageStart(out);
 365     if (!info_collection_.get()) {
 366       out->append(kErrorMessage);
 367     } else if (info_collection_->infos_by_origin.empty()) {
 368       out->append(kEmptyAppCachesMessage);
 369     } else {
 370       typedef std::map<GURL, AppCacheInfoVector> InfoByOrigin;
 371       AppCacheInfoVector appcaches;
 372       for (InfoByOrigin::const_iterator origin =
 373                info_collection_->infos_by_origin.begin();
 374            origin != info_collection_->infos_by_origin.end(); ++origin) {
 375         appcaches.insert(appcaches.end(),
 376                          origin->second.begin(), origin->second.end());
 377       }
 378       std::sort(appcaches.begin(), appcaches.end(), SortByManifestUrl);
 379
 380       GURL base_url = ClearQuery(request_->url());
 381       EmitAppCacheInfoVector(base_url, appcache_service_, appcaches, out);
 382     }
 383     EmitPageEnd(out);
 384     return net::OK;
 385   }
 386
 387  private:
 388   ~MainPageJob() override {}
 389
 390   void OnGotInfoComplete(int rv) {
 391     if (rv != net::OK)
 392       info_collection_ = NULL;
 393     StartAsync();
 394   }
 395
 396   scoped_refptr<AppCacheInfoCollection> info_collection_;
 397   base::WeakPtrFactory<MainPageJob> weak_factory_;
 398   DISALLOW_COPY_AND_ASSIGN(MainPageJob);
 399 };
 400
 401 // Job that redirects back to the main appcache internals page.
 402 class RedirectToMainPageJob : public BaseInternalsJob {
 403  public:
 404   RedirectToMainPageJob(net::URLRequest* request,
 405                         net::NetworkDelegate* network_delegate,
 406                         AppCacheServiceImpl* service)
 407       : BaseInternalsJob(request, network_delegate, service) {}
 408
 409   int GetData(std::string* mime_type,
 410               std::string* charset,
 411               std::string* data,
 412               const net::CompletionCallback& callback) const override {
 413     return net::OK;  // IsRedirectResponse induces a redirect.
 414   }
 415
 416   bool IsRedirectResponse(GURL* location, int* http_status_code) override {
 417     *location = ClearQuery(request_->url());
 418     *http_status_code = 307;
 419     return true;
 420   }
 421
 422  protected:
 423   ~RedirectToMainPageJob() override {}
 424 };
 425
 426 // Job that removes an appcache and then redirects back to the main page.
 427 class RemoveAppCacheJob : public RedirectToMainPageJob {
 428  public:
 429   RemoveAppCacheJob(
 430       net::URLRequest* request,
 431       net::NetworkDelegate* network_delegate,
 432       AppCacheServiceImpl* service,
 433       const GURL& manifest_url)
 434       : RedirectToMainPageJob(request, network_delegate, service),
 435         manifest_url_(manifest_url),
 436         weak_factory_(this) {
 437   }
 438
 439   void Start() override {
 440     DCHECK(request_);
 441
 442     appcache_service_->DeleteAppCacheGroup(
 443         manifest_url_,base::Bind(&RemoveAppCacheJob::OnDeleteAppCacheComplete,
 444                                  weak_factory_.GetWeakPtr()));
 445   }
 446
 447  private:
 448   ~RemoveAppCacheJob() override {}
 449
 450   void OnDeleteAppCacheComplete(int rv) {
 451     StartAsync();  // Causes the base class to redirect.
 452   }
 453
 454   GURL manifest_url_;
 455   base::WeakPtrFactory<RemoveAppCacheJob> weak_factory_;
 456 };
 457
 458
 459 // Job shows the details of a particular manifest url.
 460 class ViewAppCacheJob : public BaseInternalsJob,
 461                         public AppCacheStorage::Delegate {
 462  public:
 463   ViewAppCacheJob(
 464       net::URLRequest* request,
 465       net::NetworkDelegate* network_delegate,
 466       AppCacheServiceImpl* service,
 467       const GURL& manifest_url)
 468       : BaseInternalsJob(request, network_delegate, service),
 469         manifest_url_(manifest_url) {}
 470
 471   void Start() override {
 472     DCHECK(request_);
 473     appcache_storage_->LoadOrCreateGroup(manifest_url_, this);
 474   }
 475
 476   // Produces a page containing the entries listing.
 477   int GetData(std::string* mime_type,
 478               std::string* charset,
 479               std::string* out,
 480               const net::CompletionCallback& callback) const override {
 481     mime_type->assign("text/html");
 482     charset->assign("UTF-8");
 483     out->clear();
 484     EmitPageStart(out);
 485     if (appcache_info_.manifest_url.is_empty()) {
 486       out->append(kManifestNotFoundMessage);
 487     } else {
 488       GURL base_url = ClearQuery(request_->url());
 489       EmitAppCacheInfo(base_url, appcache_service_, &appcache_info_, out);
 490       EmitAppCacheResourceInfoVector(base_url,
 491                                      manifest_url_,
 492                                      resource_infos_,
 493                                      appcache_info_.group_id,
 494                                      out);
 495     }
 496     EmitPageEnd(out);
 497     return net::OK;
 498   }
 499
 500  private:
 501   ~ViewAppCacheJob() override {
 502     appcache_storage_->CancelDelegateCallbacks(this);
 503   }
 504
 505   // AppCacheStorage::Delegate override
 506   void OnGroupLoaded(AppCacheGroup* group, const GURL& manifest_url) override {
 507     DCHECK_EQ(manifest_url_, manifest_url);
 508     if (group && group->newest_complete_cache()) {
 509       appcache_info_.manifest_url = manifest_url;
 510       appcache_info_.group_id = group->group_id();
 511       appcache_info_.size = group->newest_complete_cache()->cache_size();
 512       appcache_info_.creation_time = group->creation_time();
 513       appcache_info_.last_update_time =
 514           group->newest_complete_cache()->update_time();
 515       appcache_info_.last_access_time = base::Time::Now();
 516       group->newest_complete_cache()->ToResourceInfoVector(&resource_infos_);
 517       std::sort(resource_infos_.begin(), resource_infos_.end(),
 518                 SortByResourceUrl);
 519     }
 520     StartAsync();
 521   }
 522
 523   GURL manifest_url_;
 524   AppCacheInfo appcache_info_;
 525   AppCacheResourceInfoVector resource_infos_;
 526   DISALLOW_COPY_AND_ASSIGN(ViewAppCacheJob);
 527 };
 528
 529 // Job that shows the details of a particular cached resource.
 530 class ViewEntryJob : public BaseInternalsJob,
 531                      public AppCacheStorage::Delegate {
 532  public:
 533   ViewEntryJob(
 534       net::URLRequest* request,
 535       net::NetworkDelegate* network_delegate,
 536       AppCacheServiceImpl* service,
 537       const GURL& manifest_url,
 538       const GURL& entry_url,
 539       int64 response_id, int64 group_id)
 540       : BaseInternalsJob(request, network_delegate, service),
 541         manifest_url_(manifest_url), entry_url_(entry_url),
 542         response_id_(response_id), group_id_(group_id), amount_read_(0) {
 543   }
 544
 545   void Start() override {
 546     DCHECK(request_);
 547     appcache_storage_->LoadResponseInfo(
 548         manifest_url_, group_id_, response_id_, this);
 549   }
 550
 551   // Produces a page containing the response headers and data.
 552   int GetData(std::string* mime_type,
 553               std::string* charset,
 554               std::string* out,
 555               const net::CompletionCallback& callback) const override {
 556     mime_type->assign("text/html");
 557     charset->assign("UTF-8");
 558     out->clear();
 559     EmitPageStart(out);
 560     EmitAnchor(entry_url_.spec(), entry_url_.spec(), out);
 561     out->append("<br/>\n");
 562     if (response_info_.get()) {
 563       if (response_info_->http_response_info())
 564         EmitResponseHeaders(response_info_->http_response_info()->headers.get(),
 565                             out);
 566       else
 567         out->append("Failed to read response headers.<br>");
 568
 569       if (response_data_.get()) {
 570         EmitHexDump(response_data_->data(),
 571                     amount_read_,
 572                     response_info_->response_data_size(),
 573                     out);
 574       } else {
 575         out->append("Failed to read response data.<br>");
 576       }
 577     } else {
 578       out->append("Failed to read response headers and data.<br>");
 579     }
 580     EmitPageEnd(out);
 581     return net::OK;
 582   }
 583
 584  private:
 585   ~ViewEntryJob() override { appcache_storage_->CancelDelegateCallbacks(this); }
 586
 587   void OnResponseInfoLoaded(AppCacheResponseInfo* response_info,
 588                             int64 response_id) override {
 589     if (!response_info) {
 590       StartAsync();
 591       return;
 592     }
 593     response_info_ = response_info;
 594
 595     // Read the response data, truncating if its too large.
 596     const int64 kLimit = 100 * 1000;
 597     int64 amount_to_read =
 598         std::min(kLimit, response_info->response_data_size());
 599     response_data_ = new net::IOBuffer(amount_to_read);
 600
 601     reader_.reset(appcache_storage_->CreateResponseReader(
 602         manifest_url_, group_id_, response_id_));
 603     reader_->ReadData(
 604         response_data_.get(),
 605         amount_to_read,
 606         base::Bind(&ViewEntryJob::OnReadComplete, base::Unretained(this)));
 607   }
 608
 609   void OnReadComplete(int result) {
 610     reader_.reset();
 611     amount_read_ = result;
 612     if (result < 0)
 613       response_data_ = NULL;
 614     StartAsync();
 615   }
 616
 617   GURL manifest_url_;
 618   GURL entry_url_;
 619   int64 response_id_;
 620   int64 group_id_;
 621   scoped_refptr<AppCacheResponseInfo> response_info_;
 622   scoped_refptr<net::IOBuffer> response_data_;
 623   int amount_read_;
 624   scoped_ptr<AppCacheResponseReader> reader_;
 625 };
 626
 627 }  // namespace
 628
 629 net::URLRequestJob* ViewAppCacheInternalsJobFactory::CreateJobForRequest(
 630     net::URLRequest* request,
 631     net::NetworkDelegate* network_delegate,
 632     AppCacheServiceImpl* service) {
 633   if (!request->url().has_query())
 634     return new MainPageJob(request, network_delegate, service);
 635
 636   std::string command;
 637   std::string param;
 638   ParseQuery(request->url().query(), &command, &param);
 639
 640   if (command == kRemoveCacheCommand)
 641     return new RemoveAppCacheJob(request, network_delegate, service,
 642                                  DecodeBase64URL(param));
 643
 644   if (command == kViewCacheCommand)
 645     return new ViewAppCacheJob(request, network_delegate, service,
 646                                DecodeBase64URL(param));
 647
 648   std::vector<std::string> tokens;
 649   int64 response_id = 0;
 650   int64 group_id = 0;
 651   if (command == kViewEntryCommand && Tokenize(param, "|", &tokens) == 4u &&
 652       base::StringToInt64(tokens[2], &response_id) &&
 653       base::StringToInt64(tokens[3], &group_id)) {
 654     return new ViewEntryJob(request, network_delegate, service,
 655                             DecodeBase64URL(tokens[0]),  // manifest url
 656                             DecodeBase64URL(tokens[1]),  // entry url
 657                             response_id, group_id);
 658   }
 659
 660   return new RedirectToMainPageJob(request, network_delegate, service);
 661 }
 662
 663 }  // namespace content