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// Copyright 2014 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 "components/search_provider_logos/google_logo_api.h"
#include "base/base64.h"
#include "base/json/json_reader.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "net/base/url_util.h"
namespace search_provider_logos {
namespace {
const char kResponsePreamble[] = ")]}'";
}
GURL GoogleAppendFingerprintToLogoURL(const GURL& logo_url,
const std::string& fingerprint) {
return net::AppendQueryParameter(logo_url, "async", "es_dfp:" + fingerprint);
}
scoped_ptr<EncodedLogo> GoogleParseLogoResponse(
const scoped_ptr<std::string>& response,
base::Time response_time) {
// Google doodles are sent as JSON with a prefix. Example:
// )]}' {"update":{"logo":{
// "data": "/9j/4QAYRXhpZgAASUkqAAgAAAAAAAAAAAAAAP/...",
// "mime_type": "image/png",
// "fingerprint": "db063e32",
// "target": "http://www.google.com.au/search?q=Wilbur+Christiansen",
// "alt": "Wilbur Christiansen's Birthday"
// "time_to_live": 1389304799
// }}}
// The response may start with )]}'. Ignore this.
base::StringPiece response_sp(*response);
if (response_sp.starts_with(kResponsePreamble))
response_sp.remove_prefix(strlen(kResponsePreamble));
scoped_ptr<base::Value> value(base::JSONReader::Read(response_sp));
if (!value.get())
return scoped_ptr<EncodedLogo>();
// The important data lives inside several nested dictionaries:
// {"update": {"logo": { "mime_type": ..., etc } } }
const base::DictionaryValue* outer_dict;
if (!value->GetAsDictionary(&outer_dict))
return scoped_ptr<EncodedLogo>();
const base::DictionaryValue* update_dict;
if (!outer_dict->GetDictionary("update", &update_dict))
return scoped_ptr<EncodedLogo>();
const base::DictionaryValue* logo_dict;
if (!update_dict->GetDictionary("logo", &logo_dict))
return scoped_ptr<EncodedLogo>();
scoped_ptr<EncodedLogo> logo(new EncodedLogo());
std::string encoded_image_base64;
if (logo_dict->GetString("data", &encoded_image_base64)) {
// Data is optional, since we may be revalidating a cached logo.
base::RefCountedString* encoded_image_string = new base::RefCountedString();
if (!base::Base64Decode(encoded_image_base64,
&encoded_image_string->data()))
return scoped_ptr<EncodedLogo>();
logo->encoded_image = encoded_image_string;
if (!logo_dict->GetString("mime_type", &logo->metadata.mime_type))
return scoped_ptr<EncodedLogo>();
}
// Don't check return values since these fields are optional.
logo_dict->GetString("target", &logo->metadata.on_click_url);
logo_dict->GetString("fingerprint", &logo->metadata.fingerprint);
logo_dict->GetString("alt", &logo->metadata.alt_text);
base::TimeDelta time_to_live;
int time_to_live_ms;
if (logo_dict->GetInteger("time_to_live", &time_to_live_ms)) {
time_to_live = base::TimeDelta::FromMilliseconds(
std::min(static_cast<int64>(time_to_live_ms), kMaxTimeToLiveMS));
logo->metadata.can_show_after_expiration = false;
} else {
time_to_live = base::TimeDelta::FromMilliseconds(kMaxTimeToLiveMS);
logo->metadata.can_show_after_expiration = true;
}
logo->metadata.expiration_time = response_time + time_to_live;
return logo.Pass();
}
} // namespace search_provider_logos
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