gecko-dev/mobile/android/components/PaymentsUI.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const { classes: Cc, interfaces: Ci, utils: Cu } = Components;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");

XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
                                   "@mozilla.org/childprocessmessagemanager;1",
                                   "nsIMessageSender");

function paymentSuccess(aRequestId) {
  return paymentCallback(aRequestId, "Payment:Success");
}

function paymentFailed(aRequestId) {
  return paymentCallback(aRequestId, "Payment:Failed");
}

function paymentCallback(aRequestId, aMsg) {
  return function(aResult) {
    closePaymentTab(aRequestId, function() {
      cpmm.sendAsyncMessage(aMsg, { result: aResult,
                                    requestId: aRequestId });
    });
  }
}

let paymentTabs = {};

function closePaymentTab(aId, aCallback) {
  if (paymentTabs[aId]) {
    // We ask the UI to close the selected payment flow.
    let content = Services.wm.getMostRecentWindow("navigator:browser");
    if (content) {
      content.BrowserApp.closeTab(paymentTabs[aId]);
    }

    paymentTabs[aId] = null;
  }

  aCallback();
}

function PaymentUI() {
}

PaymentUI.prototype = {
  get bundle() {
    delete this.bundle;
    return this.bundle = Services.strings.createBundle("chrome://browser/locale/payments.properties");
  },

  sendMessageToJava: function(aMsg) {
    let data = Cc["@mozilla.org/android/bridge;1"].getService(Ci.nsIAndroidBridge).handleGeckoMessage(JSON.stringify(aMsg));
    return JSON.parse(data);
  },

  confirmPaymentRequest: function confirmPaymentRequest(aRequestId,
                                                        aRequests,
                                                        aSuccessCb,
                                                        aErrorCb) {
    let _error = this._error(aErrorCb);

    let listItems = [];

    // If there's only one payment provider that will work, just move on without prompting the user.
    if (aRequests.length == 1) {
      aSuccessCb.onresult(aRequestId, aRequests[0].wrappedJSObject.type);
      return;
    }

    // Otherwise, let the user select a payment provider from a list.
    for (let i = 0; i < aRequests.length; i++) {
      let request = aRequests[i].wrappedJSObject;
      let requestText = request.providerName;
      if (request.productPrice) {
        requestText += " (" + request.productPrice[0].amount + " " +
                              request.productPrice[0].currency + ")";
      }
      listItems.push({
        label: requestText,
        isGroup: false,
        inGroup: false,
        disabled: false,
        id: i
      });
    }

    let result = this.sendMessageToJava({
      type: "Prompt:Show",
      title: this.bundle.GetStringFromName("payments.providerdialog.title"),
      multiple: false,
      selected: [],
      listItems: listItems,
    });

    if (result.button > -1 && aSuccessCb) {
      aSuccessCb.onresult(aRequestId, aRequests[result.button].wrappedJSObject.type);
    } else {
      _error(aRequestId, "USER_CANCELED");
    }
  },

  _error: function(aCallback) {
    return function _error(id, msg) {
      if (aCallback) {
        aCallback.onresult(id, msg);
      }
    };
  },

  showPaymentFlow: function showPaymentFlow(aRequestId,
                                            aPaymentFlowInfo,
                                            aErrorCb) {
    let _error = this._error(aErrorCb);

    // We ask the UI to browse to the selected payment flow.
    let content = Services.wm.getMostRecentWindow("navigator:browser");
    if (!content) {
      _error(aRequestId, "NO_CONTENT_WINDOW");
      return;
    }

    // TODO: For now, known payment providers (BlueVia and Mozilla Market)
    // only accepts the JWT by GET, so we just add it to the URI.
    // https://github.com/mozilla-b2g/gaia/blob/master/apps/system/js/payment.js
    let tab = content.BrowserApp.addTab(aPaymentFlowInfo.uri + aPaymentFlowInfo.jwt);

    // Inject paymentSuccess and paymentFailed methods into the document after its loaded.
    tab.browser.addEventListener("DOMContentLoaded", function loadPaymentShim() {
      let frame = tab.browser.contentDocument.defaultView;
      try {
        frame.wrappedJSObject.paymentSuccess = paymentSuccess(aRequestId);
        frame.wrappedJSObject.paymentFailed = paymentFailed(aRequestId);
      } catch (e) {
        _error(aRequestId, "ERROR_ADDING_METHODS");
      } finally {
        tab.browser.removeEventListener("DOMContentLoaded", loadPaymentShim);
      }
    }, false);

    // fail the payment if the tab is closed on its own
    tab.browser.addEventListener("TabClose", function paymentCanceled() {
      paymentFailed(aRequestId)();
    });

    // Store a reference to the tab so that we can close it when the payment succeeds or fails.
    paymentTabs[aRequestId] = tab;
  },

  cleanup: function cleanup() {
    // Nothing to do here.
  },

  classID: Components.ID("{3c6c9575-f57e-427b-a8aa-57bc3cbff48f}"), 
  QueryInterface: XPCOMUtils.generateQI([Ci.nsIPaymentUIGlue])
}

this.NSGetFactory = XPCOMUtils.generateNSGetFactory([PaymentUI]);