Build a new TokenCacheService so I can stop using TokenService for something it wasn't designed for.

chrome/browser/extensions/api/token_cache/token_cache.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/extensions/api/token_cache/token_cache.h"
+
+#include "base/logging.h"
+#include "chrome/common/chrome_notification_types.h"
+
+using base::Time;
+using base::TimeDelta;
+
+// TODO: Should I put this into a namespace? which one?
+
+TokenCacheService::TokenCacheService(Profile* profile) : profile_(profile) {
+  registrar_.Add(this,
+                 chrome::NOTIFICATION_GOOGLE_SIGNED_OUT,
+                 content::Source<Profile>(profile_));
+}
+
+TokenCacheService::~TokenCacheService() {
+}
+
+void TokenCacheService::StoreToken(const std::string& token_name,
+                                   const std::string& token_value,
+                                   const base::TimeDelta time_to_live) {
+  TokenCacheData token_data;
+
+  // Get the current time, and make sure that the token has not already expired.
+  Time expiration_time;
+  TimeDelta zeroDelta;

[dcheng, 2013/03/04 22:40:59]

Naming.

[Pete Williamson, 2013/03/05 19:42:25]

Done.

+
+  if (zeroDelta != time_to_live) {
+    expiration_time = Time::Now();
+    expiration_time += time_to_live;
+  }
+
+  token_data.token_name = token_name;
+  token_data.token = token_value;
+  token_data.expiration_time = expiration_time;
+
+  // Find if the token exists, and if so replace it.
+  std::vector<TokenCacheData>::iterator it = FindMatch(token_name);
+  if (it != token_cache_.end()) {
+    *it = token_data;
+    return;
+  }
+  // Otherwise, add the token to our cache.
+  token_cache_.push_back(token_data);
+}
+
+// Retrieve a token for the currently logged in user.  This returns an empty
+// string if the token was not found or timed out.
+std::string TokenCacheService::RetrieveToken(const std::string& token_name) {
+  std::vector<TokenCacheData>::iterator it = FindMatch(token_name);
+
+  if (it != token_cache_.end()) {
+    return it->token;
+  }
+
+  return std::string();
+}
+
+// Inherited from ProfileKeyedService.
+void TokenCacheService::Shutdown() {
+  token_cache_.clear();

[dcheng, 2013/03/04 22:40:59]

Do we need this method? Can't we just let it happen in the destructor?

[Pete Williamson, 2013/03/05 19:42:25]

Done.

+}
+
+// Inherited from NotificationObserver.
+void TokenCacheService::Observe(int type,
+                                const content::NotificationSource& source,
+                                const content::NotificationDetails& details)  {
+  if (type == chrome::NOTIFICATION_GOOGLE_SIGNED_OUT)
+    token_cache_.clear();
+}
+
+// TODO(petewil): Replace this with find_if, functor, and bind first argument,
+// that should be more elegant and possibly more performant.
+std::vector<TokenCacheData>::iterator TokenCacheService::FindMatch(
+    const std::string& token_name) {
+
+  std::vector<TokenCacheData>::iterator it;
+
+  for (it = token_cache_.begin(); token_cache_.end() != it; ++it) {
+    if (0 == token_name.compare(it->token_name)) {
+      Time now = Time::Now();
+      Time zero;
+      if (it->expiration_time.is_null() || now < it->expiration_time) {
+        return it;
+      } else {
+        // Remove this entry if it is expired.
+        token_cache_.erase(it);
+        return token_cache_.end();
+      }
+    }
+  }
+
+  return token_cache_.end();
+}