webkit/appcache/view_appcache_internals_job.cc - chromium/src - Git at Google

 // Copyright (c) 2011 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 <algorithm>
 #include <string>

 #include "webkit/appcache/view_appcache_internals_job.h"

 #include "base/base64.h"
 #include "base/format_macros.h"
 #include "base/i18n/time_formatting.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "net/base/escape.h"
 #include "net/base/io_buffer.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_simple_job.h"
 #include "net/url_request/view_cache_helper.h"
 #include "webkit/appcache/appcache.h"
 #include "webkit/appcache/appcache_group.h"
 #include "webkit/appcache/appcache_policy.h"
 #include "webkit/appcache/appcache_response.h"
 #include "webkit/appcache/appcache_service.h"

 namespace appcache {
 namespace {

 const char kErrorMessage[] = "Error in retrieving Application Caches.";
 const char kEmptyAppCachesMessage[] = "No available Application Caches.";
 const char kManifestNotFoundMessage[] = "Manifest not found.";
 const char kManifest[] = "Manifest: ";
 const char kSize[] = "Size: ";
 const char kCreationTime[] = "Creation Time: ";
 const char kLastAccessTime[] = "Last Access Time: ";
 const char kLastUpdateTime[] = "Last Update Time: ";
 const char kFormattedDisabledAppCacheMsg[] =
     "<b><i><font color=\"FF0000\">"
     "This Application Cache is disabled by policy.</font></i></b><br/>";
 const char kRemoveCacheLabel[] = "Remove";
 const char kViewCacheLabel[] = "View Entries";
 const char kRemoveCacheCommand[] = "remove-cache";
 const char kViewCacheCommand[] = "view-cache";
 const char kViewEntryCommand[] = "view-entry";

 void EmitPageStart(std::string* out) {
   out->append(
       "<!DOCTYPE HTML>\n"
       "<html><title>AppCache Internals</title>\n"
       "<meta http-equiv=\"X-WebKit-CSP\""
       "  content=\"object-src 'none'; script-src 'none'\">\n"
       "<style>\n"
       "body { font-family: sans-serif; font-size: 0.8em; }\n"
       "tt, code, pre { font-family: WebKitHack, monospace; }\n"
       "form { display: inline; }\n"
       ".subsection_body { margin: 10px 0 10px 2em; }\n"
       ".subsection_title { font-weight: bold; }\n"
       "</style>\n"
       "</head><body>\n");
 }

 void EmitPageEnd(std::string* out) {
   out->append("</body></html>\n");
 }

 void EmitListItem(const std::string& label,
                   const std::string& data,
                   std::string* out) {
   out->append("<li>");
   out->append(EscapeForHTML(label));
   out->append(EscapeForHTML(data));
   out->append("</li>\n");
 }

 void EmitAnchor(const std::string& url, const std::string& text,
                 std::string* out) {
   out->append("<a href=\"");
   out->append(EscapeForHTML(url));
   out->append("\">");
   out->append(EscapeForHTML(text));
   out->append("</a>");
 }

 void EmitCommandAnchor(const char* label,
                        const GURL& base_url,
                        const char* command,
                        const char* param,
                        std::string* out) {
   std::string query(command);
   query.push_back('=');
   query.append(param);
   GURL::Replacements replacements;
   replacements.SetQuery(query.data(),
                         url_parse::Component(0, query.length()));
   GURL command_url = base_url.ReplaceComponents(replacements);
   EmitAnchor(command_url.spec(), label, out);
 }

 void EmitAppCacheInfo(const GURL& base_url,
                       AppCacheService* service,
                       const AppCacheInfo* info,
                       std::string* out) {
   std::string manifest_url_base64;
   base::Base64Encode(info->manifest_url.spec(), &manifest_url_base64);

   out->append("\n<p>");
   out->append(kManifest);
   EmitAnchor(info->manifest_url.spec(), info->manifest_url.spec(), out);
   out->append("<br/>\n");
   if (!service->appcache_policy()->CanLoadAppCache(
           info->manifest_url)) {
     out->append(kFormattedDisabledAppCacheMsg);
   }
   out->append("\n<br/>\n");
   EmitCommandAnchor(kRemoveCacheLabel, base_url,
                     kRemoveCacheCommand, manifest_url_base64.c_str(), out);
   out->append("&nbsp;&nbsp;");
   EmitCommandAnchor(kViewCacheLabel, base_url,
                     kViewCacheCommand, manifest_url_base64.c_str(), out);
   out->append("\n<br/>\n");
   out->append("<ul>");
   EmitListItem(
       kSize,
       UTF16ToUTF8(FormatBytesUnlocalized(info->size)),
       out);
   EmitListItem(
       kCreationTime,
       UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->creation_time)),
       out);
   EmitListItem(
       kLastUpdateTime,
       UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->last_update_time)),
       out);
   EmitListItem(
       kLastAccessTime,
       UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->last_access_time)),
       out);
   out->append("</ul></p></br>\n");
 }

 void EmitAppCacheInfoVector(
     const GURL& base_url,
     AppCacheService* service,
     const AppCacheInfoVector& appcaches,
     std::string* out) {
   for (std::vector<AppCacheInfo>::const_iterator info =
            appcaches.begin();
        info != appcaches.end(); ++info) {
     EmitAppCacheInfo(base_url, service, &(*info), out);
   }
 }

 void EmitTableData(const std::string& data, bool align_right, bool bold,
                    std::string* out) {
   if (align_right)
     out->append("<td align='right'>");
   else
     out->append("<td>");
   if (bold)
     out->append("<b>");
   out->append(data);
   if (bold)
     out->append("</b>");
   out->append("</td>");
 }

 std::string FormFlagsString(const AppCacheResourceInfo& info) {
   std::string str;
   if (info.is_manifest)
     str.append("Manifest, ");
   if (info.is_master)
     str.append("Master, ");
   if (info.is_fallback)
     str.append("Fallback, ");
   if (info.is_explicit)
     str.append("Explicit, ");
   if (info.is_foreign)
     str.append("Foreign, ");
   return str;
 }

 std::string FormViewEntryAnchor(const GURL& base_url,
                                 const GURL& manifest_url, const GURL& entry_url,
                                 int64 response_id) {
   std::string manifest_url_base64;
   std::string entry_url_base64;
   std::string response_id_string;
   base::Base64Encode(manifest_url.spec(), &manifest_url_base64);
   base::Base64Encode(entry_url.spec(), &entry_url_base64);
   response_id_string = base::Int64ToString(response_id);

   std::string query(kViewEntryCommand);
   query.push_back('=');
   query.append(manifest_url_base64);
   query.push_back('|');
   query.append(entry_url_base64);
   query.push_back('|');
   query.append(response_id_string);

   GURL::Replacements replacements;
   replacements.SetQuery(query.data(),
                         url_parse::Component(0, query.length()));
   GURL view_entry_url = base_url.ReplaceComponents(replacements);

   std::string anchor;
   EmitAnchor(view_entry_url.spec(), entry_url.spec(), &anchor);
   return anchor;
 }

 void EmitAppCacheResourceInfoVector(
     const GURL& base_url,
     const GURL& manifest_url,
     const AppCacheResourceInfoVector& resource_infos,
     std::string* out) {
   out->append("<table border='0'>\n");
   out->append("<tr>");
   EmitTableData("Flags", false, true, out);
   EmitTableData("URL", false, true, out);
   EmitTableData("Size (headers and data)", true, true, out);
   out->append("</tr>\n");
   for (AppCacheResourceInfoVector::const_iterator
           iter = resource_infos.begin();
        iter != resource_infos.end(); ++iter) {
     out->append("<tr>");
     EmitTableData(FormFlagsString(*iter), false, false, out);
     EmitTableData(FormViewEntryAnchor(base_url, manifest_url,
                                       iter->url, iter->response_id),
                   false, false, out);
     EmitTableData(UTF16ToUTF8(FormatBytesUnlocalized(iter->size)),
                   true, false, out);
     out->append("</tr>\n");
   }
   out->append("</table>\n");
 }

 void EmitResponseHeaders(net::HttpResponseHeaders* headers, std::string* out) {
   out->append("<hr><pre>");
   out->append(EscapeForHTML(headers->GetStatusLine()));
   out->push_back('\n');

   void* iter = NULL;
   std::string name, value;
   while (headers->EnumerateHeaderLines(&iter, &name, &value)) {
     out->append(EscapeForHTML(name));
     out->append(": ");
     out->append(EscapeForHTML(value));
     out->push_back('\n');
   }
   out->append("</pre>");
 }

 void EmitHexDump(const char *buf, size_t buf_len, size_t total_len,
                  std::string* out) {
   out->append("<hr><pre>");
   base::StringAppendF(out, "Showing %d of %d bytes\n\n",
                       static_cast<int>(buf_len), static_cast<int>(total_len));
   net::ViewCacheHelper::HexDump(buf, buf_len, out);
   if (buf_len < total_len)
     out->append("\nNote: data is truncated...");
   out->append("</pre>");
 }

 GURL DecodeBase64URL(const std::string base64) {
   std::string url;
   base::Base64Decode(base64, &url);
   return GURL(url);
 }

 bool ParseQuery(const std::string& query,
                 std::string* command, std::string* value) {
   size_t position = query.find("=");
   if (position == std::string::npos)
     return false;
   *command = query.substr(0, position);
   *value = query.substr(position + 1);
   return !command->empty() && !value->empty();
 }

 bool SortByManifestUrl(const AppCacheInfo& lhs,
                        const AppCacheInfo& rhs) {
   return lhs.manifest_url.spec() < rhs.manifest_url.spec();
 }

 bool SortByResourceUrl(const AppCacheResourceInfo& lhs,
                        const AppCacheResourceInfo& rhs) {
   return lhs.url.spec() < rhs.url.spec();
 }

 GURL ClearQuery(const GURL& url) {
   GURL::Replacements replacements;
   replacements.ClearQuery();
   return url.ReplaceComponents(replacements);
 }

 // Simple base class for the job subclasses defined here.
 class BaseInternalsJob : public net::URLRequestSimpleJob {
  protected:
   BaseInternalsJob(net::URLRequest* request, AppCacheService* service)
       : URLRequestSimpleJob(request), appcache_service_(service) {}

   AppCacheService* appcache_service_;
 };

 // Job that lists all appcaches in the system.
 class MainPageJob : public BaseInternalsJob {
  public:
   MainPageJob(net::URLRequest* request, AppCacheService* service)
       : BaseInternalsJob(request, service) {}

   virtual void Start() {
     DCHECK(request_);
     info_collection_ = new AppCacheInfoCollection;
     gotinfo_complete_callback_ =
         new net::CancelableCompletionCallback<MainPageJob>(
             this, &MainPageJob::OnGotInfoComplete);
     appcache_service_->GetAllAppCacheInfo(
         info_collection_, gotinfo_complete_callback_);
   }

   // Produces a page containing the listing
   virtual bool GetData(std::string* mime_type,
                        std::string* charset,
                        std::string* out) const {
     mime_type->assign("text/html");
     charset->assign("UTF-8");

     out->clear();
     EmitPageStart(out);
     if (!info_collection_.get()) {
       out->append(kErrorMessage);
     } else if (info_collection_->infos_by_origin.empty()) {
       out->append(kEmptyAppCachesMessage);
     } else {
       typedef std::map<GURL, AppCacheInfoVector> InfoByOrigin;
       AppCacheInfoVector appcaches;
       for (InfoByOrigin::const_iterator origin =
                info_collection_->infos_by_origin.begin();
            origin != info_collection_->infos_by_origin.end(); ++origin) {
         appcaches.insert(appcaches.end(),
                          origin->second.begin(), origin->second.end());
       }
       std::sort(appcaches.begin(), appcaches.end(), SortByManifestUrl);

       GURL base_url = ClearQuery(request_->url());
       EmitAppCacheInfoVector(base_url, appcache_service_, appcaches, out);
     }
     EmitPageEnd(out);
     return true;
   }

  private:
   virtual ~MainPageJob() {
     if (gotinfo_complete_callback_)
       gotinfo_complete_callback_.release()->Cancel();
   }

   void OnGotInfoComplete(int rv) {
     gotinfo_complete_callback_ = NULL;
     if (rv != net::OK)
       info_collection_ = NULL;
     StartAsync();
   }

   scoped_refptr<net::CancelableCompletionCallback<MainPageJob> >
       gotinfo_complete_callback_;
   scoped_refptr<AppCacheInfoCollection> info_collection_;
   DISALLOW_COPY_AND_ASSIGN(MainPageJob);
 };

 // Job that redirects back to the main appcache internals page.
 class RedirectToMainPageJob : public BaseInternalsJob {
  public:
   RedirectToMainPageJob(net::URLRequest* request, AppCacheService* service)
       : BaseInternalsJob(request, service) {}

   virtual bool GetData(std::string* mime_type,
                        std::string* charset,
                        std::string* data) const {
     return true;  // IsRedirectResponse induces a redirect.
   }

   virtual bool IsRedirectResponse(GURL* location, int* http_status_code) {
     *location = ClearQuery(request_->url());
     *http_status_code = 307;
     return true;
   }
 };

 // Job that removes an appcache and then redirects back to the main page.
 class RemoveAppCacheJob : public RedirectToMainPageJob {
  public:
   RemoveAppCacheJob(
       net::URLRequest* request, AppCacheService* service,
       const GURL& manifest_url)
       : RedirectToMainPageJob(request, service),
         manifest_url_(manifest_url) {}

   virtual void Start() {
     DCHECK(request_);
     delete_appcache_callback_ =
         new net::CancelableCompletionCallback<RemoveAppCacheJob>(
             this, &RemoveAppCacheJob::OnDeleteAppCacheComplete);
     appcache_service_->DeleteAppCacheGroup(
         manifest_url_, delete_appcache_callback_);
   }

  private:
   virtual ~RemoveAppCacheJob() {
     if (delete_appcache_callback_)
       delete_appcache_callback_.release()->Cancel();
   }

   void OnDeleteAppCacheComplete(int rv) {
     delete_appcache_callback_ = NULL;
     StartAsync();  // Causes the base class to redirect.
   }

   GURL manifest_url_;
   scoped_refptr<net::CancelableCompletionCallback<RemoveAppCacheJob> >
       delete_appcache_callback_;
 };


 // Job shows the details of a particular manifest url.
 class ViewAppCacheJob : public BaseInternalsJob,
                         public AppCacheStorage::Delegate {
  public:
   ViewAppCacheJob(
       net::URLRequest* request, AppCacheService* service,
       const GURL manifest_url)
       : BaseInternalsJob(request, service),
         manifest_url_(manifest_url) {}

   virtual void Start() {
     DCHECK(request_);
     appcache_service_->storage()->LoadOrCreateGroup(manifest_url_, this);
   }

   // Produces a page containing the entries listing.
   virtual bool GetData(std::string* mime_type,
                        std::string* charset,
                        std::string* out) const {
     mime_type->assign("text/html");
     charset->assign("UTF-8");
     out->clear();
     EmitPageStart(out);
     if (appcache_info_.manifest_url.is_empty()) {
       out->append(kManifestNotFoundMessage);
     } else {
       GURL base_url = ClearQuery(request_->url());
       EmitAppCacheInfo(base_url, appcache_service_, &appcache_info_, out);
       EmitAppCacheResourceInfoVector(base_url,
                                      manifest_url_,
                                      resource_infos_, out);
     }
     EmitPageEnd(out);
     return true;
   }

  private:
   virtual ~ViewAppCacheJob() {
     appcache_service_->storage()->CancelDelegateCallbacks(this);
   }

   // AppCacheStorage::Delegate override
   virtual void OnGroupLoaded(
       AppCacheGroup* group, const GURL& manifest_url) OVERRIDE {
     DCHECK_EQ(manifest_url_, manifest_url);
     if (group && group->newest_complete_cache()) {
       appcache_info_.manifest_url = manifest_url;
       appcache_info_.size = group->newest_complete_cache()->cache_size();
       appcache_info_.creation_time = group->creation_time();
       appcache_info_.last_update_time =
           group->newest_complete_cache()->update_time();
       appcache_info_.last_access_time = base::Time::Now();
       group->newest_complete_cache()->ToResourceInfoVector(&resource_infos_);
       std::sort(resource_infos_.begin(), resource_infos_.end(),
                 SortByResourceUrl);
     }
     StartAsync();
   }

   GURL manifest_url_;
   AppCacheInfo appcache_info_;
   AppCacheResourceInfoVector resource_infos_;
   DISALLOW_COPY_AND_ASSIGN(ViewAppCacheJob);
 };

 // Job that shows the details of a particular cached resource.
 class ViewEntryJob : public BaseInternalsJob,
                      public AppCacheStorage::Delegate {
  public:
   ViewEntryJob(
       net::URLRequest* request, AppCacheService* service,
       const GURL& manifest_url, const GURL& entry_url,
       int64 response_id)
       : BaseInternalsJob(request, service),
         manifest_url_(manifest_url), entry_url_(entry_url),
         response_id_(response_id), amount_read_(0),
         ALLOW_THIS_IN_INITIALIZER_LIST(read_callback_(
             this, &ViewEntryJob::OnReadComplete)) {}

   virtual void Start() {
     DCHECK(request_);
     appcache_service_->storage()->LoadResponseInfo(
         manifest_url_, response_id_, this);
   }

   // Produces a page containing the response headers and data.
   virtual bool GetData(std::string* mime_type,
                        std::string* charset,
                        std::string* out) const {
     mime_type->assign("text/html");
     charset->assign("UTF-8");
     out->clear();
     EmitPageStart(out);
     EmitAnchor(entry_url_.spec(), entry_url_.spec(), out);
     out->append("<br/>\n");
     if (response_info_) {
       if (response_info_->http_response_info())
         EmitResponseHeaders(response_info_->http_response_info()->headers, out);
       else
         out->append("Failed to read response headers.<br>");

       if (response_data_) {
         EmitHexDump(response_data_->data(), amount_read_,
                     response_info_->response_data_size(), out);
       } else {
         out->append("Failed to read response data.<br>");
       }
     } else {
       out->append("Failed to read response headers and data.<br>");
     }
     EmitPageEnd(out);
     return true;
   }

  private:
   virtual ~ViewEntryJob() {
     appcache_service_->storage()->CancelDelegateCallbacks(this);
   }

   virtual void OnResponseInfoLoaded(
       AppCacheResponseInfo* response_info, int64 response_id) OVERRIDE {
     if (!response_info) {
       StartAsync();
       return;
     }
     response_info_ = response_info;

     // Read the response data, truncating if its too large.
     const int64 kLimit = 100 * 1000;
     int64 amount_to_read =
         std::min(kLimit, response_info->response_data_size());
     response_data_ = new net::IOBuffer(amount_to_read);

     reader_.reset(appcache_service_->storage()->CreateResponseReader(
         manifest_url_, response_id_));
     reader_->ReadData(
         response_data_, amount_to_read, &read_callback_);
   }

   void OnReadComplete(int result) {
     reader_.reset();
     amount_read_ = result;
     if (result < 0)
       response_data_ = NULL;
     StartAsync();
   }

   GURL manifest_url_;
   GURL entry_url_;
   int64 response_id_;
   scoped_refptr<AppCacheResponseInfo> response_info_;
   scoped_refptr<net::IOBuffer> response_data_;
   int amount_read_;
   scoped_ptr<AppCacheResponseReader> reader_;
   net::CompletionCallbackImpl<ViewEntryJob> read_callback_;
 };

 }  // namespace

 net::URLRequestJob* ViewAppCacheInternalsJobFactory::CreateJobForRequest(
     net::URLRequest* request,  AppCacheService* service) {
   if (!request->url().has_query())
     return new MainPageJob(request, service);

   std::string command;
   std::string param;
   ParseQuery(request->url().query(), &command, &param);

   if (command == kRemoveCacheCommand)
     return new RemoveAppCacheJob(request, service,
                                  DecodeBase64URL(param));

   if (command == kViewCacheCommand)
     return new ViewAppCacheJob(request, service,
                                DecodeBase64URL(param));

   std::vector<std::string> tokens;
   int64 response_id;
   if (command == kViewEntryCommand &&
       Tokenize(param, "|", &tokens) == 3u &&
       base::StringToInt64(tokens[2], &response_id)) {
     return new ViewEntryJob(request, service,
                             DecodeBase64URL(tokens[0]),  // manifest url
                             DecodeBase64URL(tokens[1]),  // entry url
                             response_id);
   }

   return new RedirectToMainPageJob(request, service);
 }

 }  // namespace appcache
	// Copyright (c) 2011 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 <algorithm>
	#include <string>

	#include "webkit/appcache/view_appcache_internals_job.h"

	#include "base/base64.h"
	#include "base/format_macros.h"
	#include "base/i18n/time_formatting.h"
	#include "base/logging.h"
	#include "base/string_number_conversions.h"
	#include "base/string_util.h"
	#include "base/stringprintf.h"
	#include "base/utf_string_conversions.h"
	#include "net/base/escape.h"
	#include "net/base/io_buffer.h"
	#include "net/http/http_response_headers.h"
	#include "net/url_request/url_request.h"
	#include "net/url_request/url_request_simple_job.h"
	#include "net/url_request/view_cache_helper.h"
	#include "webkit/appcache/appcache.h"
	#include "webkit/appcache/appcache_group.h"
	#include "webkit/appcache/appcache_policy.h"
	#include "webkit/appcache/appcache_response.h"
	#include "webkit/appcache/appcache_service.h"

	namespace appcache {
	namespace {

	const char kErrorMessage[] = "Error in retrieving Application Caches.";
	const char kEmptyAppCachesMessage[] = "No available Application Caches.";
	const char kManifestNotFoundMessage[] = "Manifest not found.";
	const char kManifest[] = "Manifest: ";
	const char kSize[] = "Size: ";
	const char kCreationTime[] = "Creation Time: ";
	const char kLastAccessTime[] = "Last Access Time: ";
	const char kLastUpdateTime[] = "Last Update Time: ";
	const char kFormattedDisabledAppCacheMsg[] =
	"<b><i><font color=\"FF0000\">"
	"This Application Cache is disabled by policy.</font></i></b><br/>";
	const char kRemoveCacheLabel[] = "Remove";
	const char kViewCacheLabel[] = "View Entries";
	const char kRemoveCacheCommand[] = "remove-cache";
	const char kViewCacheCommand[] = "view-cache";
	const char kViewEntryCommand[] = "view-entry";

	void EmitPageStart(std::string* out) {
	out->append(
	"<!DOCTYPE HTML>\n"
	"<html><title>AppCache Internals</title>\n"
	"<meta http-equiv=\"X-WebKit-CSP\""
	" content=\"object-src 'none'; script-src 'none'\">\n"
	"<style>\n"
	"body { font-family: sans-serif; font-size: 0.8em; }\n"
	"tt, code, pre { font-family: WebKitHack, monospace; }\n"
	"form { display: inline; }\n"
	".subsection_body { margin: 10px 0 10px 2em; }\n"
	".subsection_title { font-weight: bold; }\n"
	"</style>\n"
	"</head><body>\n");
	}

	void EmitPageEnd(std::string* out) {
	out->append("</body></html>\n");
	}

	void EmitListItem(const std::string& label,
	const std::string& data,
	std::string* out) {
	out->append("<li>");
	out->append(EscapeForHTML(label));
	out->append(EscapeForHTML(data));
	out->append("</li>\n");
	}

	void EmitAnchor(const std::string& url, const std::string& text,
	std::string* out) {
	out->append("<a href=\"");
	out->append(EscapeForHTML(url));
	out->append("\">");
	out->append(EscapeForHTML(text));
	out->append("</a>");
	}

	void EmitCommandAnchor(const char* label,
	const GURL& base_url,
	const char* command,
	const char* param,
	std::string* out) {
	std::string query(command);
	query.push_back('=');
	query.append(param);
	GURL::Replacements replacements;
	replacements.SetQuery(query.data(),
	url_parse::Component(0, query.length()));
	GURL command_url = base_url.ReplaceComponents(replacements);
	EmitAnchor(command_url.spec(), label, out);
	}

	void EmitAppCacheInfo(const GURL& base_url,
	AppCacheService* service,
	const AppCacheInfo* info,
	std::string* out) {
	std::string manifest_url_base64;
	base::Base64Encode(info->manifest_url.spec(), &manifest_url_base64);

	out->append("\n<p>");
	out->append(kManifest);
	EmitAnchor(info->manifest_url.spec(), info->manifest_url.spec(), out);
	out->append("<br/>\n");
	if (!service->appcache_policy()->CanLoadAppCache(
	info->manifest_url)) {
	out->append(kFormattedDisabledAppCacheMsg);
	}
	out->append("\n<br/>\n");
	EmitCommandAnchor(kRemoveCacheLabel, base_url,
	kRemoveCacheCommand, manifest_url_base64.c_str(), out);
	out->append("  ");
	EmitCommandAnchor(kViewCacheLabel, base_url,
	kViewCacheCommand, manifest_url_base64.c_str(), out);
	out->append("\n<br/>\n");
	out->append("<ul>");
	EmitListItem(
	kSize,
	UTF16ToUTF8(FormatBytesUnlocalized(info->size)),
	out);
	EmitListItem(
	kCreationTime,
	UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->creation_time)),
	out);
	EmitListItem(
	kLastUpdateTime,
	UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->last_update_time)),
	out);
	EmitListItem(
	kLastAccessTime,
	UTF16ToUTF8(TimeFormatFriendlyDateAndTime(info->last_access_time)),
	out);
	out->append("</ul></p></br>\n");
	}

	void EmitAppCacheInfoVector(
	const GURL& base_url,
	AppCacheService* service,
	const AppCacheInfoVector& appcaches,
	std::string* out) {
	for (std::vector<AppCacheInfo>::const_iterator info =
	appcaches.begin();
	info != appcaches.end(); ++info) {
	EmitAppCacheInfo(base_url, service, &(*info), out);
	}
	}

	void EmitTableData(const std::string& data, bool align_right, bool bold,
	std::string* out) {
	if (align_right)
	out->append("<td align='right'>");
	else
	out->append("<td>");
	if (bold)
	out->append("<b>");
	out->append(data);
	if (bold)
	out->append("</b>");
	out->append("</td>");
	}

	std::string FormFlagsString(const AppCacheResourceInfo& info) {
	std::string str;
	if (info.is_manifest)
	str.append("Manifest, ");
	if (info.is_master)
	str.append("Master, ");
	if (info.is_fallback)
	str.append("Fallback, ");
	if (info.is_explicit)
	str.append("Explicit, ");
	if (info.is_foreign)
	str.append("Foreign, ");
	return str;
	}

	std::string FormViewEntryAnchor(const GURL& base_url,
	const GURL& manifest_url, const GURL& entry_url,
	int64 response_id) {
	std::string manifest_url_base64;
	std::string entry_url_base64;
	std::string response_id_string;
	base::Base64Encode(manifest_url.spec(), &manifest_url_base64);
	base::Base64Encode(entry_url.spec(), &entry_url_base64);
	response_id_string = base::Int64ToString(response_id);

	std::string query(kViewEntryCommand);
	query.push_back('=');
	query.append(manifest_url_base64);
	query.push_back('\|');
	query.append(entry_url_base64);
	query.push_back('\|');
	query.append(response_id_string);

	GURL::Replacements replacements;
	replacements.SetQuery(query.data(),
	url_parse::Component(0, query.length()));
	GURL view_entry_url = base_url.ReplaceComponents(replacements);

	std::string anchor;
	EmitAnchor(view_entry_url.spec(), entry_url.spec(), &anchor);
	return anchor;
	}

	void EmitAppCacheResourceInfoVector(
	const GURL& base_url,
	const GURL& manifest_url,
	const AppCacheResourceInfoVector& resource_infos,
	std::string* out) {
	out->append("<table border='0'>\n");
	out->append("<tr>");
	EmitTableData("Flags", false, true, out);
	EmitTableData("URL", false, true, out);
	EmitTableData("Size (headers and data)", true, true, out);
	out->append("</tr>\n");
	for (AppCacheResourceInfoVector::const_iterator
	iter = resource_infos.begin();
	iter != resource_infos.end(); ++iter) {
	out->append("<tr>");
	EmitTableData(FormFlagsString(*iter), false, false, out);
	EmitTableData(FormViewEntryAnchor(base_url, manifest_url,
	iter->url, iter->response_id),
	false, false, out);
	EmitTableData(UTF16ToUTF8(FormatBytesUnlocalized(iter->size)),
	true, false, out);
	out->append("</tr>\n");
	}
	out->append("</table>\n");
	}

	void EmitResponseHeaders(net::HttpResponseHeaders* headers, std::string* out) {
	out->append("<hr><pre>");
	out->append(EscapeForHTML(headers->GetStatusLine()));
	out->push_back('\n');

	void* iter = NULL;
	std::string name, value;
	while (headers->EnumerateHeaderLines(&iter, &name, &value)) {
	out->append(EscapeForHTML(name));
	out->append(": ");
	out->append(EscapeForHTML(value));
	out->push_back('\n');
	}
	out->append("</pre>");
	}

	void EmitHexDump(const char *buf, size_t buf_len, size_t total_len,
	std::string* out) {
	out->append("<hr><pre>");
	base::StringAppendF(out, "Showing %d of %d bytes\n\n",
	static_cast<int>(buf_len), static_cast<int>(total_len));
	net::ViewCacheHelper::HexDump(buf, buf_len, out);
	if (buf_len < total_len)
	out->append("\nNote: data is truncated...");
	out->append("</pre>");
	}

	GURL DecodeBase64URL(const std::string base64) {
	std::string url;
	base::Base64Decode(base64, &url);
	return GURL(url);
	}

	bool ParseQuery(const std::string& query,
	std::string* command, std::string* value) {
	size_t position = query.find("=");
	if (position == std::string::npos)
	return false;
	*command = query.substr(0, position);
	*value = query.substr(position + 1);
	return !command->empty() && !value->empty();
	}

	bool SortByManifestUrl(const AppCacheInfo& lhs,
	const AppCacheInfo& rhs) {
	return lhs.manifest_url.spec() < rhs.manifest_url.spec();
	}

	bool SortByResourceUrl(const AppCacheResourceInfo& lhs,
	const AppCacheResourceInfo& rhs) {
	return lhs.url.spec() < rhs.url.spec();
	}

	GURL ClearQuery(const GURL& url) {
	GURL::Replacements replacements;
	replacements.ClearQuery();
	return url.ReplaceComponents(replacements);
	}

	// Simple base class for the job subclasses defined here.
	class BaseInternalsJob : public net::URLRequestSimpleJob {
	protected:
	BaseInternalsJob(net::URLRequest* request, AppCacheService* service)
	: URLRequestSimpleJob(request), appcache_service_(service) {}

	AppCacheService* appcache_service_;
	};

	// Job that lists all appcaches in the system.
	class MainPageJob : public BaseInternalsJob {
	public:
	MainPageJob(net::URLRequest* request, AppCacheService* service)
	: BaseInternalsJob(request, service) {}

	virtual void Start() {
	DCHECK(request_);
	info_collection_ = new AppCacheInfoCollection;
	gotinfo_complete_callback_ =
	new net::CancelableCompletionCallback<MainPageJob>(
	this, &MainPageJob::OnGotInfoComplete);
	appcache_service_->GetAllAppCacheInfo(
	info_collection_, gotinfo_complete_callback_);
	}

	// Produces a page containing the listing
	virtual bool GetData(std::string* mime_type,
	std::string* charset,
	std::string* out) const {
	mime_type->assign("text/html");
	charset->assign("UTF-8");

	out->clear();
	EmitPageStart(out);
	if (!info_collection_.get()) {
	out->append(kErrorMessage);
	} else if (info_collection_->infos_by_origin.empty()) {
	out->append(kEmptyAppCachesMessage);
	} else {
	typedef std::map<GURL, AppCacheInfoVector> InfoByOrigin;
	AppCacheInfoVector appcaches;
	for (InfoByOrigin::const_iterator origin =
	info_collection_->infos_by_origin.begin();
	origin != info_collection_->infos_by_origin.end(); ++origin) {
	appcaches.insert(appcaches.end(),
	origin->second.begin(), origin->second.end());
	}
	std::sort(appcaches.begin(), appcaches.end(), SortByManifestUrl);

	GURL base_url = ClearQuery(request_->url());
	EmitAppCacheInfoVector(base_url, appcache_service_, appcaches, out);
	}
	EmitPageEnd(out);
	return true;
	}

	private:
	virtual ~MainPageJob() {
	if (gotinfo_complete_callback_)
	gotinfo_complete_callback_.release()->Cancel();
	}

	void OnGotInfoComplete(int rv) {
	gotinfo_complete_callback_ = NULL;
	if (rv != net::OK)
	info_collection_ = NULL;
	StartAsync();
	}

	scoped_refptr<net::CancelableCompletionCallback<MainPageJob> >
	gotinfo_complete_callback_;
	scoped_refptr<AppCacheInfoCollection> info_collection_;
	DISALLOW_COPY_AND_ASSIGN(MainPageJob);
	};

	// Job that redirects back to the main appcache internals page.
	class RedirectToMainPageJob : public BaseInternalsJob {
	public:
	RedirectToMainPageJob(net::URLRequest* request, AppCacheService* service)
	: BaseInternalsJob(request, service) {}

	virtual bool GetData(std::string* mime_type,
	std::string* charset,
	std::string* data) const {
	return true; // IsRedirectResponse induces a redirect.
	}

	virtual bool IsRedirectResponse(GURL* location, int* http_status_code) {
	*location = ClearQuery(request_->url());
	*http_status_code = 307;
	return true;
	}
	};

	// Job that removes an appcache and then redirects back to the main page.
	class RemoveAppCacheJob : public RedirectToMainPageJob {
	public:
	RemoveAppCacheJob(
	net::URLRequest* request, AppCacheService* service,
	const GURL& manifest_url)
	: RedirectToMainPageJob(request, service),
	manifest_url_(manifest_url) {}

	virtual void Start() {
	DCHECK(request_);
	delete_appcache_callback_ =
	new net::CancelableCompletionCallback<RemoveAppCacheJob>(
	this, &RemoveAppCacheJob::OnDeleteAppCacheComplete);
	appcache_service_->DeleteAppCacheGroup(
	manifest_url_, delete_appcache_callback_);
	}

	private:
	virtual ~RemoveAppCacheJob() {
	if (delete_appcache_callback_)
	delete_appcache_callback_.release()->Cancel();
	}

	void OnDeleteAppCacheComplete(int rv) {
	delete_appcache_callback_ = NULL;
	StartAsync(); // Causes the base class to redirect.
	}

	GURL manifest_url_;
	scoped_refptr<net::CancelableCompletionCallback<RemoveAppCacheJob> >
	delete_appcache_callback_;
	};


	// Job shows the details of a particular manifest url.
	class ViewAppCacheJob : public BaseInternalsJob,
	public AppCacheStorage::Delegate {
	public:
	ViewAppCacheJob(
	net::URLRequest* request, AppCacheService* service,
	const GURL manifest_url)
	: BaseInternalsJob(request, service),
	manifest_url_(manifest_url) {}

	virtual void Start() {
	DCHECK(request_);
	appcache_service_->storage()->LoadOrCreateGroup(manifest_url_, this);
	}

	// Produces a page containing the entries listing.
	virtual bool GetData(std::string* mime_type,
	std::string* charset,
	std::string* out) const {
	mime_type->assign("text/html");
	charset->assign("UTF-8");
	out->clear();
	EmitPageStart(out);
	if (appcache_info_.manifest_url.is_empty()) {
	out->append(kManifestNotFoundMessage);
	} else {
	GURL base_url = ClearQuery(request_->url());
	EmitAppCacheInfo(base_url, appcache_service_, &appcache_info_, out);
	EmitAppCacheResourceInfoVector(base_url,
	manifest_url_,
	resource_infos_, out);
	}
	EmitPageEnd(out);
	return true;
	}

	private:
	virtual ~ViewAppCacheJob() {
	appcache_service_->storage()->CancelDelegateCallbacks(this);
	}

	// AppCacheStorage::Delegate override
	virtual void OnGroupLoaded(
	AppCacheGroup* group, const GURL& manifest_url) OVERRIDE {
	DCHECK_EQ(manifest_url_, manifest_url);
	if (group && group->newest_complete_cache()) {
	appcache_info_.manifest_url = manifest_url;
	appcache_info_.size = group->newest_complete_cache()->cache_size();
	appcache_info_.creation_time = group->creation_time();
	appcache_info_.last_update_time =
	group->newest_complete_cache()->update_time();
	appcache_info_.last_access_time = base::Time::Now();
	group->newest_complete_cache()->ToResourceInfoVector(&resource_infos_);
	std::sort(resource_infos_.begin(), resource_infos_.end(),
	SortByResourceUrl);
	}
	StartAsync();
	}

	GURL manifest_url_;
	AppCacheInfo appcache_info_;
	AppCacheResourceInfoVector resource_infos_;
	DISALLOW_COPY_AND_ASSIGN(ViewAppCacheJob);
	};

	// Job that shows the details of a particular cached resource.
	class ViewEntryJob : public BaseInternalsJob,
	public AppCacheStorage::Delegate {
	public:
	ViewEntryJob(
	net::URLRequest* request, AppCacheService* service,
	const GURL& manifest_url, const GURL& entry_url,
	int64 response_id)
	: BaseInternalsJob(request, service),
	manifest_url_(manifest_url), entry_url_(entry_url),
	response_id_(response_id), amount_read_(0),
	ALLOW_THIS_IN_INITIALIZER_LIST(read_callback_(
	this, &ViewEntryJob::OnReadComplete)) {}

	virtual void Start() {
	DCHECK(request_);
	appcache_service_->storage()->LoadResponseInfo(
	manifest_url_, response_id_, this);
	}

	// Produces a page containing the response headers and data.
	virtual bool GetData(std::string* mime_type,
	std::string* charset,
	std::string* out) const {
	mime_type->assign("text/html");
	charset->assign("UTF-8");
	out->clear();
	EmitPageStart(out);
	EmitAnchor(entry_url_.spec(), entry_url_.spec(), out);
	out->append("<br/>\n");
	if (response_info_) {
	if (response_info_->http_response_info())
	EmitResponseHeaders(response_info_->http_response_info()->headers, out);
	else
	out->append("Failed to read response headers.<br>");

	if (response_data_) {
	EmitHexDump(response_data_->data(), amount_read_,
	response_info_->response_data_size(), out);
	} else {
	out->append("Failed to read response data.<br>");
	}
	} else {
	out->append("Failed to read response headers and data.<br>");
	}
	EmitPageEnd(out);
	return true;
	}

	private:
	virtual ~ViewEntryJob() {
	appcache_service_->storage()->CancelDelegateCallbacks(this);
	}

	virtual void OnResponseInfoLoaded(
	AppCacheResponseInfo* response_info, int64 response_id) OVERRIDE {
	if (!response_info) {
	StartAsync();
	return;
	}
	response_info_ = response_info;

	// Read the response data, truncating if its too large.
	const int64 kLimit = 100 * 1000;
	int64 amount_to_read =
	std::min(kLimit, response_info->response_data_size());
	response_data_ = new net::IOBuffer(amount_to_read);

	reader_.reset(appcache_service_->storage()->CreateResponseReader(
	manifest_url_, response_id_));
	reader_->ReadData(
	response_data_, amount_to_read, &read_callback_);
	}

	void OnReadComplete(int result) {
	reader_.reset();
	amount_read_ = result;
	if (result < 0)
	response_data_ = NULL;
	StartAsync();
	}

	GURL manifest_url_;
	GURL entry_url_;
	int64 response_id_;
	scoped_refptr<AppCacheResponseInfo> response_info_;
	scoped_refptr<net::IOBuffer> response_data_;
	int amount_read_;
	scoped_ptr<AppCacheResponseReader> reader_;
	net::CompletionCallbackImpl<ViewEntryJob> read_callback_;
	};

	} // namespace

	net::URLRequestJob* ViewAppCacheInternalsJobFactory::CreateJobForRequest(
	net::URLRequest* request, AppCacheService* service) {
	if (!request->url().has_query())
	return new MainPageJob(request, service);

	std::string command;
	std::string param;
	ParseQuery(request->url().query(), &command, &param);

	if (command == kRemoveCacheCommand)
	return new RemoveAppCacheJob(request, service,
	DecodeBase64URL(param));

	if (command == kViewCacheCommand)
	return new ViewAppCacheJob(request, service,
	DecodeBase64URL(param));

	std::vector<std::string> tokens;
	int64 response_id;
	if (command == kViewEntryCommand &&
	Tokenize(param, "\|", &tokens) == 3u &&
	base::StringToInt64(tokens[2], &response_id)) {
	return new ViewEntryJob(request, service,
	DecodeBase64URL(tokens[0]), // manifest url
	DecodeBase64URL(tokens[1]), // entry url
	response_id);
	}

	return new RedirectToMainPageJob(request, service);
	}

	} // namespace appcache