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