components/autofill/content/browser/wallet/wallet_client.h

   1 // Copyright 2013 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 #ifndef COMPONENTS_AUTOFILL_CONTENT_BROWSER_WALLET_WALLET_CLIENT_H_
   6 #define COMPONENTS_AUTOFILL_CONTENT_BROWSER_WALLET_WALLET_CLIENT_H_
   7
   8 #include <queue>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/callback.h"  // For base::Closure.
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/time/time.h"
  16 #include "base/values.h"
  17 #include "components/autofill/content/browser/wallet/full_wallet.h"
  18 #include "components/autofill/content/browser/wallet/wallet_items.h"
  19 #include "components/autofill/core/browser/autofill_client.h"
  20 #include "components/autofill/core/browser/autofill_metrics.h"
  21 #include "net/url_request/url_fetcher_delegate.h"
  22 #include "testing/gtest/include/gtest/gtest_prod.h"
  23 #include "url/gurl.h"
  24
  25 namespace net {
  26 class URLFetcher;
  27 class URLRequestContextGetter;
  28 }
  29
  30 namespace autofill {
  31 namespace wallet {
  32
  33 class Address;
  34 class FullWallet;
  35 class Instrument;
  36 class WalletClientDelegate;
  37
  38 // WalletClient is responsible for making calls to the Online Wallet backend on
  39 // the user's behalf. The normal flow for using this class is as follows:
  40 // 1) GetWalletItems should be called to retrieve the user's Wallet.
  41 //   a) If the user does not have a Wallet, they must AcceptLegalDocuments and
  42 //      SaveToWallet to set up their account before continuing.
  43 //   b) If the user has not accepted the most recent legal documents for
  44 //      Wallet, they must AcceptLegalDocuments.
  45 // 2) The user then chooses what instrument and shipping address to use for the
  46 //    current transaction.
  47 //   a) If they choose an instrument with a zip code only address, the billing
  48 //      address will need to be updated using SaveToWallet.
  49 //   b) The user may also choose to add a new instrument or address using
  50 //      SaveToWallet.
  51 // 3) Once the user has selected the backing instrument and shipping address
  52 //    for this transaction, a FullWallet with the fronting card is generated
  53 //    using GetFullWallet.
  54 //   a) GetFullWallet may return a Risk challenge for the user. In that case,
  55 //      the user will need to verify who they are by authenticating their
  56 //      chosen backing instrument through AuthenticateInstrument
  57 //
  58 // WalletClient is designed so only one request to Online Wallet can be outgoing
  59 // at any one time. If |HasRequestInProgress()| is true while calling e.g.
  60 // GetWalletItems(), the request will be queued and started later. Queued
  61 // requests start in the order they were received.
  62
  63 class WalletClient : public net::URLFetcherDelegate {
  64  public:
  65   // The Risk challenges supported by users of WalletClient.
  66   enum RiskCapability {
  67     RELOGIN,
  68     VERIFY_CVC,
  69   };
  70
  71   // The type of error returned by Online Wallet.
  72   enum ErrorType {
  73     // Errors to display to users ----------------------------------------------
  74     BUYER_ACCOUNT_ERROR,                // Risk deny, unsupported country, or
  75                                         // account closed.
  76     BUYER_LEGAL_ADDRESS_NOT_SUPPORTED,  // User's Buyer Legal Address is
  77                                         // unsupported by Online Wallet.
  78     UNVERIFIED_KNOW_YOUR_CUSTOMER_STATUS,  // User's "know your customer" KYC
  79                                            // state is not verified (either
  80                                            // KYC_REFER or KYC_FAIL).
  81     UNSUPPORTED_MERCHANT,               // Merchant is blacklisted due to
  82                                         // compliance violation.
  83     SPENDING_LIMIT_EXCEEDED,            // The desired transaction amount was
  84                                         // over Wallet's limit.
  85
  86     // API errors --------------------------------------------------------------
  87     // Request was very malformed or sent to the wrong endpoint.
  88     BAD_REQUEST,
  89     // API call had missing or invalid parameters.
  90     INVALID_PARAMS,
  91     // The server API version of the request is no longer supported.
  92     UNSUPPORTED_API_VERSION,
  93     // The user agent is not supported or a bad Google API key was provided.
  94     UNSUPPORTED_USER_AGENT_OR_API_KEY,
  95
  96     // Server errors -----------------------------------------------------------
  97     INTERNAL_ERROR,           // Unknown server side error.
  98     SERVICE_UNAVAILABLE,      // Online Wallet is down.
  99
 100     // Other errors ------------------------------------------------------------
 101     MALFORMED_RESPONSE,       // The response from Wallet was malformed.
 102     NETWORK_ERROR,            // The response code of the server was something
 103                               // other than a 200 or 400.
 104
 105     UNKNOWN_ERROR,            // Catch all error type.
 106   };
 107
 108   struct FullWalletRequest {
 109    public:
 110     FullWalletRequest(const std::string& instrument_id,
 111                       const std::string& address_id,
 112                       const std::string& google_transaction_id,
 113                       const std::vector<RiskCapability> risk_capabilities,
 114                       bool new_wallet_user);
 115     ~FullWalletRequest();
 116
 117     // The ID of the backing instrument. Should have been selected by the user
 118     // in some UI.
 119     std::string instrument_id;
 120
 121     // The ID of the shipping address. Should have been selected by the user
 122     // in some UI.
 123     std::string address_id;
 124
 125     // The transaction ID from GetWalletItems.
 126     std::string google_transaction_id;
 127
 128     // The Risk challenges supported by the user of WalletClient
 129     std::vector<RiskCapability> risk_capabilities;
 130
 131     // True if the user does not have Wallet profile.
 132     bool new_wallet_user;
 133
 134    private:
 135     DISALLOW_ASSIGN(FullWalletRequest);
 136   };
 137
 138   // |context_getter| is reference counted so it has no lifetime or ownership
 139   // requirements. |delegate| must outlive |this|. |source_url| is the url
 140   // of the merchant page.
 141   WalletClient(net::URLRequestContextGetter* context_getter,
 142                WalletClientDelegate* delegate,
 143                const GURL& source_url);
 144
 145   ~WalletClient() override;
 146
 147   // GetWalletItems retrieves the user's online wallet. The WalletItems
 148   // returned may require additional action such as presenting legal documents
 149   // to the user to be accepted.
 150   virtual void GetWalletItems(const base::string16& amount,
 151                               const base::string16& currency);
 152
 153   // The GetWalletItems call to the Online Wallet backend may require the user
 154   // to accept various legal documents before a FullWallet can be generated.
 155   // The |google_transaction_id| is provided in the response to the
 156   // GetWalletItems call. If |documents| are empty, |delegate_| will not receive
 157   // a corresponding |OnDidAcceptLegalDocuments()| call.
 158   virtual void AcceptLegalDocuments(
 159       const std::vector<WalletItems::LegalDocument*>& documents,
 160       const std::string& google_transaction_id);
 161
 162   // Authenticates that |card_verification_number| is for the backing instrument
 163   // with |instrument_id|. |obfuscated_gaia_id| is used as a key when escrowing
 164   // |card_verification_number|. |delegate_| is notified when the request is
 165   // complete. Used to respond to Risk challenges.
 166   virtual void AuthenticateInstrument(
 167       const std::string& instrument_id,
 168       const std::string& card_verification_number);
 169
 170   // GetFullWallet retrieves the a FullWallet for the user.
 171   virtual void GetFullWallet(const FullWalletRequest& full_wallet_request);
 172
 173   // Saves the data in |instrument| and/or |address| to Wallet. |instrument|
 174   // does not have to be complete if it's being used to update an existing
 175   // instrument, like in the case of expiration date or address only updates.
 176   // |reference_instrument| and |reference_address| are the original instrument
 177   // and address to be updated on the server (and should be NULL if |instrument|
 178   // or |address| are new data).
 179   virtual void SaveToWallet(
 180       scoped_ptr<Instrument> instrument,
 181       scoped_ptr<Address> address,
 182       const WalletItems::MaskedInstrument* reference_instrument,
 183       const Address* reference_address);
 184
 185   bool HasRequestInProgress() const;
 186
 187   // Cancels and clears the current |request_|.
 188   void CancelRequest();
 189
 190   // Sets the user index and cancels any pending requests.
 191   void SetUserIndex(size_t user_index);
 192   size_t user_index() const { return user_index_; }
 193
 194  private:
 195   FRIEND_TEST_ALL_PREFIXES(WalletClientTest, PendingRequest);
 196   FRIEND_TEST_ALL_PREFIXES(WalletClientTest, CancelRequests);
 197
 198   enum RequestType {
 199     NO_REQUEST,
 200     ACCEPT_LEGAL_DOCUMENTS,
 201     AUTHENTICATE_INSTRUMENT,
 202     GET_FULL_WALLET,
 203     GET_WALLET_ITEMS,
 204     SAVE_TO_WALLET,
 205   };
 206
 207   // Like AcceptLegalDocuments, but takes a vector of document ids.
 208   void DoAcceptLegalDocuments(
 209       const std::vector<std::string>& document_ids,
 210       const std::string& google_transaction_id);
 211
 212   // Posts |post_body| to |url| with content type |mime_type| and notifies
 213   // |delegate_| when the request is complete.
 214   void MakeWalletRequest(const GURL& url,
 215                          const std::string& post_body,
 216                          const std::string& mime_type,
 217                          RequestType request_type);
 218
 219   // Performs bookkeeping tasks for any invalid requests.
 220   void HandleMalformedResponse(RequestType request_type,
 221                                net::URLFetcher* request);
 222   void HandleNetworkError(int response_code);
 223   void HandleWalletError(ErrorType error_type);
 224
 225   // net::URLFetcherDelegate:
 226   void OnURLFetchComplete(const net::URLFetcher* source) override;
 227
 228   // Logs an UMA metric for each of the |required_actions|.
 229   void LogRequiredActions(
 230       const std::vector<RequiredAction>& required_actions) const;
 231
 232   // Converts |request_type| to an UMA metric.
 233   AutofillMetrics::WalletApiCallMetric RequestTypeToUmaMetric(
 234       RequestType request_type) const;
 235
 236   // The context for the request. Ensures the gdToken cookie is set as a header
 237   // in the requests to Online Wallet if it is present.
 238   scoped_refptr<net::URLRequestContextGetter> context_getter_;
 239
 240   // Observer class that has its various On* methods called based on the results
 241   // of a request to Online Wallet.
 242   WalletClientDelegate* const delegate_;  // must outlive |this|.
 243
 244   // The index of the user account we're making requests for. The index is into
 245   // GAIA's list of signed in users.
 246   size_t user_index_;
 247
 248   // The URL of the page we're making requests on behalf of.
 249   GURL source_url_;
 250
 251   // The current request object.
 252   scoped_ptr<net::URLFetcher> request_;
 253
 254   // The type of the current request. Must be NO_REQUEST for a request
 255   // to be initiated as only one request may be running at a given time.
 256   RequestType request_type_;
 257
 258   // The one time pad used for GetFullWallet encryption.
 259   std::vector<uint8> one_time_pad_;
 260
 261   // When the current request started. Used to track client side latency.
 262   base::Time request_started_timestamp_;
 263
 264   base::WeakPtrFactory<WalletClient> weak_ptr_factory_;
 265
 266   DISALLOW_COPY_AND_ASSIGN(WalletClient);
 267 };
 268
 269 }  // namespace wallet
 270 }  // namespace autofill
 271
 272 #endif  // COMPONENTS_AUTOFILL_CONTENT_BROWSER_WALLET_WALLET_CLIENT_H_