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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "components/search_provider_logos/google_logo_api.h"
      6 
      7 #include "base/base64.h"
      8 #include "base/json/json_reader.h"
      9 #include "base/memory/ref_counted_memory.h"
     10 #include "base/strings/string_util.h"
     11 #include "base/values.h"
     12 
     13 namespace search_provider_logos {
     14 
     15 namespace {
     16 const char kResponsePreamble[] = ")]}'";
     17 }
     18 
     19 GURL GoogleAppendFingerprintToLogoURL(const GURL& logo_url,
     20                                       const std::string& fingerprint) {
     21   // Note: we can't just use net::AppendQueryParameter() because it escapes
     22   // ":" to "%3A", but the server requires the colon not to be escaped.
     23   // See: http://crbug.com/413845
     24 
     25   // TODO(newt): Switch to using net::AppendQueryParameter once it no longer
     26   // escapes ":"
     27 
     28   std::string query(logo_url.query());
     29   if (!query.empty())
     30     query += "&";
     31 
     32   query += "async=es_dfp:";
     33   query += fingerprint;
     34   GURL::Replacements replacements;
     35   replacements.SetQueryStr(query);
     36   return logo_url.ReplaceComponents(replacements);
     37 }
     38 
     39 scoped_ptr<EncodedLogo> GoogleParseLogoResponse(
     40     const scoped_ptr<std::string>& response,
     41     base::Time response_time) {
     42   // Google doodles are sent as JSON with a prefix. Example:
     43   //   )]}' {"update":{"logo":{
     44   //     "data": "/9j/4QAYRXhpZgAASUkqAAgAAAAAAAAAAAAAAP/...",
     45   //     "mime_type": "image/png",
     46   //     "fingerprint": "db063e32",
     47   //     "target": "http://www.google.com.au/search?q=Wilbur+Christiansen",
     48   //     "alt": "Wilbur Christiansen's Birthday"
     49   //     "time_to_live": 1389304799
     50   //   }}}
     51 
     52   // The response may start with )]}'. Ignore this.
     53   base::StringPiece response_sp(*response);
     54   if (response_sp.starts_with(kResponsePreamble))
     55     response_sp.remove_prefix(strlen(kResponsePreamble));
     56 
     57   scoped_ptr<base::Value> value(base::JSONReader::Read(response_sp));
     58   if (!value.get())
     59     return scoped_ptr<EncodedLogo>();
     60 
     61   // The important data lives inside several nested dictionaries:
     62   // {"update": {"logo": { "mime_type": ..., etc } } }
     63   const base::DictionaryValue* outer_dict;
     64   if (!value->GetAsDictionary(&outer_dict))
     65     return scoped_ptr<EncodedLogo>();
     66   const base::DictionaryValue* update_dict;
     67   if (!outer_dict->GetDictionary("update", &update_dict))
     68     return scoped_ptr<EncodedLogo>();
     69   const base::DictionaryValue* logo_dict;
     70   if (!update_dict->GetDictionary("logo", &logo_dict))
     71     return scoped_ptr<EncodedLogo>();
     72 
     73   scoped_ptr<EncodedLogo> logo(new EncodedLogo());
     74 
     75   std::string encoded_image_base64;
     76   if (logo_dict->GetString("data", &encoded_image_base64)) {
     77     // Data is optional, since we may be revalidating a cached logo.
     78     base::RefCountedString* encoded_image_string = new base::RefCountedString();
     79     if (!base::Base64Decode(encoded_image_base64,
     80                             &encoded_image_string->data()))
     81       return scoped_ptr<EncodedLogo>();
     82     logo->encoded_image = encoded_image_string;
     83     if (!logo_dict->GetString("mime_type", &logo->metadata.mime_type))
     84       return scoped_ptr<EncodedLogo>();
     85   }
     86 
     87   // Don't check return values since these fields are optional.
     88   logo_dict->GetString("target", &logo->metadata.on_click_url);
     89   logo_dict->GetString("fingerprint", &logo->metadata.fingerprint);
     90   logo_dict->GetString("alt", &logo->metadata.alt_text);
     91 
     92   base::TimeDelta time_to_live;
     93   int time_to_live_ms;
     94   if (logo_dict->GetInteger("time_to_live", &time_to_live_ms)) {
     95     time_to_live = base::TimeDelta::FromMilliseconds(
     96         std::min(static_cast<int64>(time_to_live_ms), kMaxTimeToLiveMS));
     97     logo->metadata.can_show_after_expiration = false;
     98   } else {
     99     time_to_live = base::TimeDelta::FromMilliseconds(kMaxTimeToLiveMS);
    100     logo->metadata.can_show_after_expiration = true;
    101   }
    102   logo->metadata.expiration_time = response_time + time_to_live;
    103 
    104   return logo.Pass();
    105 }
    106 
    107 }  // namespace search_provider_logos
    108