Download autocheckout whitelist and enable autocheckout for whitelisted sites only.

chrome/browser/autofill/autocheckout/whitelist_manager.cc

+// Copyright (c) 2013 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/autofill/autocheckout/whitelist_manager.h"
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/string_split.h"
+#include "base/string_util.h"
+#include "base/supports_user_data.h"

[Ilya Sherman, 2013/01/31 05:01:29]

nit: This is already included in the header.

[benquan, 2013/01/31 23:17:08]

Done.

+#include "chrome/common/chrome_switches.h"
+#include "content/public/browser/browser_context.h"
+#include "googleurl/src/gurl.h"
+#include "net/http/http_status_code.h"
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_request_context_getter.h"
+
+namespace {
+
+// Back off in seconds after each whitelist download is attempted.
+const int kDownloadIntervalSeconds = 86400;  // 1 day
+
+// The delay in seconds after startup before download whitelist. This helps
+// to reduce contention at startup time.
+const int kInitialDownloadDelaySeconds = 3;
+
+const char kWhitelistUrl[] =
+    "http://www.gstatic.com/commerce/autocheckout/whitelist.csv";
+
+const char kWhiteListKeyName[] = "autocheckout_whitelist_manager";
+
+} //  namespace
+
+
+namespace autofill {
+namespace autocheckout {
+
+// static
+WhitelistManager* WhitelistManager::GetForBrowserContext(
+    content::BrowserContext* context) {
+  WhitelistManager* whitelist_manager = static_cast<WhitelistManager*>(
+      context->GetUserData(kWhiteListKeyName));
+  if (!whitelist_manager) {
+    whitelist_manager =
+        new WhitelistManager(context->GetRequestContext());
+    whitelist_manager->ScheduleDownload(kInitialDownloadDelaySeconds);
+    context->SetUserData(kWhiteListKeyName, whitelist_manager);
+  }
+  return whitelist_manager;
+}
+
+WhitelistManager::WhitelistManager(
+    net::URLRequestContextGetter* context_getter)
+    : callback_is_pending_(false),
+      context_getter_(context_getter),
+      experimental_form_filling_enabled_(
+          CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kEnableExperimentalFormFilling)){
+  DCHECK(context_getter);
+}
+
+void WhitelistManager::ScheduleDownload(size_t interval_seconds) {
+  if (!experimental_form_filling_enabled_) {
+    // The feature is not enabled: do not do the request.
+    return;
+  }
+  if (download_timer_.IsRunning() || callback_is_pending_) {
+    // A download activity is already scheduled or happening.
+    return;
+  }
+  StartDownloadTimer(interval_seconds);
+}
+
+void WhitelistManager::StartDownloadTimer(size_t interval_seconds) {
+  download_timer_.Start(FROM_HERE,
+                        base::TimeDelta::FromSeconds(interval_seconds),
+                        this,
+                        &WhitelistManager::TriggerDownload);
+}
+
+void WhitelistManager::TriggerDownload() {
+  callback_is_pending_ = true;
+
+  request_.reset(net::URLFetcher::Create(
+      0, GURL(kWhitelistUrl), net::URLFetcher::GET, this));
+  request_->SetRequestContext(context_getter_);
+  request_->Start();
+}
+
+void WhitelistManager::StopDownloadTimer() {
+  download_timer_.Stop();
+}
+
+void WhitelistManager::OnURLFetchComplete(
+    const net::URLFetcher* source) {
+  DCHECK(callback_is_pending_);
+  callback_is_pending_ = false;
+  scoped_ptr<net::URLFetcher> old_request = request_.Pass();
+  DCHECK_EQ(source, old_request.get());
+
+  if (source->GetResponseCode() == net::HTTP_OK) {
+    std::string data;
+    source->GetResponseAsString(&data);
+    BuildWhitelist(data);
+  }
+
+  ScheduleDownload(kDownloadIntervalSeconds);
+}
+
+std::string WhitelistManager::GetMatchedURLPrefix(const GURL& url) const {
+  if (!experimental_form_filling_enabled_)
+    return "";

[Ilya Sherman, 2013/01/31 05:01:29]

nit: Prefer std::string() to "".

[benquan, 2013/01/31 23:17:08]

Done.

+
+  if (url.is_empty())
+    return "";
+
+  for (std::vector<std::string>::const_iterator it = url_prefixes_.begin();
+      it != url_prefixes_.end(); ++it) {
+    // This is only for ~20 sites initially, liner search is sufficient.
+    // TODO(benquan): Look for optimization options when we support
+    // more sites.
+    if (StartsWithASCII(url.spec(), *it, true))
+      return *it;
+  }
+  return "";
+}
+
+void WhitelistManager::BuildWhitelist(const std::string& data) {
+  // TODO(benquan): find a better way to parse csv data.

[Ilya Sherman, 2013/01/31 05:01:29]

nit: Is this TODO still relevant?

[benquan, 2013/01/31 23:17:08]

Done.

+  std::vector<std::string> new_url_prefixes;
+
+  std::vector<std::string> lines;
+  base::SplitString(data, '\n', &lines);
+
+  for (std::vector<std::string>::const_iterator line = lines.begin();
+      line != lines.end(); ++line) {
+    if (!line->empty()) {
+      std::vector<std::string> fields;
+      base::SplitString(*line, ',', &fields);
+      // Currently we have only one column in the whitelist file, if we decide
+      // to add more metadata as additional columns, previous versions of
+      // Chrome can ignore them and continue to work.
+      if (!fields[0].empty())
+        new_url_prefixes.push_back(fields[0]);
+    }
+  }
+  url_prefixes_ = new_url_prefixes;
+}
+
+}  // namespace autocheckout
+}  // namespace autofill
+