Factor Chrome details out of update manifest fetching.

chrome/browser/extensions/updater/manifest_fetch_data.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/extensions/updater/manifest_fetch_data.h"
-
-#include <vector>
-
-#include "base/logging.h"
-#include "base/metrics/histogram.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "chrome/browser/google/google_brand.h"
-#include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
-#include "components/omaha_query_params/omaha_query_params.h"
-#include "net/base/escape.h"
-
-namespace {
-
-// Maximum length of an extension manifest update check url, since it is a GET
-// request. We want to stay under 2K because of proxies, etc.
-const int kExtensionsManifestMaxURLSize = 2000;
-
-}  // namespace
-
-namespace extensions {
-
-ManifestFetchData::ManifestFetchData(const GURL& update_url, int request_id)
-    : base_url_(update_url),
-      full_url_(update_url) {
-  std::string query = full_url_.has_query() ?
-      full_url_.query() + "&" : std::string();
-  query += omaha_query_params::OmahaQueryParams::Get(
-      omaha_query_params::OmahaQueryParams::CRX);
-  GURL::Replacements replacements;
-  replacements.SetQueryStr(query);
-  full_url_ = full_url_.ReplaceComponents(replacements);
-
-  request_ids_.insert(request_id);
-}
-
-ManifestFetchData::~ManifestFetchData() {}
-
-// The format for request parameters in update checks is:
-//
-//   ?x=EXT1_INFO&x=EXT2_INFO
-//
-// where EXT1_INFO and EXT2_INFO are url-encoded strings of the form:
-//
-//   id=EXTENSION_ID&v=VERSION&uc
-//
-// Additionally, we may include the parameter ping=PING_DATA where PING_DATA
-// looks like r=DAYS or a=DAYS for extensions in the Chrome extensions gallery.
-// ('r' refers to 'roll call' ie installation, and 'a' refers to 'active').
-// These values will each be present at most once every 24 hours, and indicate
-// the number of days since the last time it was present in an update check.
-//
-// So for two extensions like:
-//   Extension 1- id:aaaa version:1.1
-//   Extension 2- id:bbbb version:2.0
-//
-// the full update url would be:
-//   http://somehost/path?x=id%3Daaaa%26v%3D1.1%26uc&x=id%3Dbbbb%26v%3D2.0%26uc
-//
-// (Note that '=' is %3D and '&' is %26 when urlencoded.)
-bool ManifestFetchData::AddExtension(const std::string& id,
-                                     const std::string& version,
-                                     const PingData* ping_data,
-                                     const std::string& update_url_data,
-                                     const std::string& install_source) {
-  if (extension_ids_.find(id) != extension_ids_.end()) {
-    NOTREACHED() << "Duplicate extension id " << id;
-    return false;
-  }
-
-  // Compute the string we'd append onto the full_url_, and see if it fits.
-  std::vector<std::string> parts;
-  parts.push_back("id=" + id);
-  parts.push_back("v=" + version);
-  if (!install_source.empty())
-    parts.push_back("installsource=" + install_source);
-  parts.push_back("uc");
-
-  if (!update_url_data.empty()) {
-    // Make sure the update_url_data string is escaped before using it so that
-    // there is no chance of overriding the id or v other parameter value
-    // we place into the x= value.
-    parts.push_back("ap=" + net::EscapeQueryParamValue(update_url_data, true));
-  }
-
-  // Append brand code, rollcall and active ping parameters.
-  if (base_url_.DomainIs("google.com")) {
-#if defined(GOOGLE_CHROME_BUILD)
-    std::string brand;
-    google_brand::GetBrand(&brand);
-    if (!brand.empty() && !google_brand::IsOrganic(brand))
-      parts.push_back("brand=" + brand);
-#endif
-
-    std::string ping_value;
-    pings_[id] = PingData(0, 0, false);
-
-    if (ping_data) {
-      if (ping_data->rollcall_days == kNeverPinged ||
-          ping_data->rollcall_days > 0) {
-        ping_value += "r=" + base::IntToString(ping_data->rollcall_days);
-        if (ChromeMetricsServiceAccessor::IsMetricsReportingEnabled()) {
-          ping_value += "&e=" + std::string(ping_data->is_enabled ? "1" : "0");
-        }
-        pings_[id].rollcall_days = ping_data->rollcall_days;
-        pings_[id].is_enabled = ping_data->is_enabled;
-      }
-      if (ping_data->active_days == kNeverPinged ||
-          ping_data->active_days > 0) {
-        if (!ping_value.empty())
-          ping_value += "&";
-        ping_value += "a=" + base::IntToString(ping_data->active_days);
-        pings_[id].active_days = ping_data->active_days;
-      }
-    }
-    if (!ping_value.empty())
-      parts.push_back("ping=" + net::EscapeQueryParamValue(ping_value, true));
-  }
-
-  std::string extra = full_url_.has_query() ? "&" : "?";
-  extra += "x=" + net::EscapeQueryParamValue(JoinString(parts, '&'), true);
-
-  // Check against our max url size, exempting the first extension added.
-  int new_size = full_url_.possibly_invalid_spec().size() + extra.size();
-  if (!extension_ids_.empty() && new_size > kExtensionsManifestMaxURLSize) {
-    UMA_HISTOGRAM_PERCENTAGE("Extensions.UpdateCheckHitUrlSizeLimit", 1);
-    return false;
-  }
-  UMA_HISTOGRAM_PERCENTAGE("Extensions.UpdateCheckHitUrlSizeLimit", 0);
-
-  // We have room so go ahead and add the extension.
-  extension_ids_.insert(id);
-  full_url_ = GURL(full_url_.possibly_invalid_spec() + extra);
-  return true;
-}
-
-bool ManifestFetchData::Includes(const std::string& extension_id) const {
-  return extension_ids_.find(extension_id) != extension_ids_.end();
-}
-
-bool ManifestFetchData::DidPing(const std::string& extension_id,
-                                PingType type) const {
-  std::map<std::string, PingData>::const_iterator i = pings_.find(extension_id);
-  if (i == pings_.end())
-    return false;
-  int value = 0;
-  if (type == ROLLCALL)
-    value = i->second.rollcall_days;
-  else if (type == ACTIVE)
-    value = i->second.active_days;
-  else
-    NOTREACHED();
-  return value == kNeverPinged || value > 0;
-}
-
-void ManifestFetchData::Merge(const ManifestFetchData& other) {
-  DCHECK(full_url() == other.full_url());
-  request_ids_.insert(other.request_ids_.begin(), other.request_ids_.end());
-}
-
-}  // namespace extensions