Add Print Preview UI to accept and reject printer sharing invitations.

chrome/browser/resources/print_preview/data/invitation_store.js

+// 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.
+
+cr.define('print_preview', function() {
+  'use strict';
+
+  /**
+   * Printer sharing invitations data store.
+   * @param {!print_preview.UserInfo} userInfo User information repository.
+   * @constructor
+   * @extends {cr.EventTarget}
+   */
+  function InvitationStore(userInfo) {
+    cr.EventTarget.call(this);
+
+    /**
+     * User information repository.
+     * @private {!print_preview.UserInfo}
+     */
+    this.userInfo_ = userInfo;
+
+    /**
+     * Maps user account to the list of invitations for this account.
+     * @private {!Object.<string, !Array.<!print_preview.Invitation>>}
+     */
+    this.invitations_ = {};
+
+    /**
+     * Maps user account to the flag whether the invitations for this account
+     * were successfully loaded.
+     * @private {!Object.<string, print_preview.InvitationStore.LoadStatus_>}
+     */
+    this.loadStatus_ = {};
+
+    /**
+     * Event tracker used to track event listeners of the destination store.
+     * @private {!EventTracker}
+     */
+    this.tracker_ = new EventTracker();
+
+    /**
+     * Used to fetch and process invitations.
+     * @private {print_preview.CloudPrintInterface}
+     */
+    this.cloudPrintInterface_ = null;
+
+    /**
+     * Invitation being processed now. Only one invitation can be processed at
+     * a time.
+     * @private {print_preview.Invitation}
+     */
+    this.invitationInProgress_ = null;
+  };
+
+  /**
+   * Event types dispatched by the data store.
+   * @enum {string}
+   */
+  InvitationStore.EventType = {
+    INVITATION_PROCESSED:
+        'print_preview.InvitationStore.INVITATION_PROCESSED',
+    INVITATION_SEARCH_DONE:
+        'print_preview.InvitationStore.INVITATION_SEARCH_DONE'
+  };
+
+  /**
+   * @enum {number}
+   * @private
+   */
+  InvitationStore.LoadStatus_ = {
+    IN_PROGRESS: 1,
+    DONE: 2,
+    FAILED: 3
+  };
+
+  InvitationStore.prototype = {
+    __proto__: cr.EventTarget.prototype,
+
+    /**
+     * @return {print_preview.Invitation} Currently processed invitation or
+     *     {@code null}.
+     */
+    get invitationInProgress() {
+      return this.invitationInProgress_;
+    },
+
+    /**
+     * @param {string} account Account to filter invitations by.
+     * @return {!Array.<!print_preview.Invitation>} List of invitations for the
+     *     {@code account}.
+     */
+    invitations: function(account) {
+      return this.invitations_[account] || [];
+    },
+
+    /**
+     * Sets the invitation store's Google Cloud Print interface.
+     * @param {!print_preview.CloudPrintInterface} cloudPrintInterface Interface
+     *     to set.
+     */
+    setCloudPrintInterface: function(cloudPrintInterface) {
+      this.cloudPrintInterface_ = cloudPrintInterface;
+      this.tracker_.add(
+          this.cloudPrintInterface_,
+          cloudprint.CloudPrintInterface.EventType.INVITES_DONE,
+          this.onCloudPrintInvitesDone_.bind(this));
+      this.tracker_.add(
+          this.cloudPrintInterface_,
+          cloudprint.CloudPrintInterface.EventType.INVITES_FAILED,
+          this.onCloudPrintInvitesDone_.bind(this));
+      this.tracker_.add(
+          this.cloudPrintInterface_,
+          cloudprint.CloudPrintInterface.EventType.PROCESS_INVITE_DONE,
+          this.onCloudPrintProcessInviteDone_.bind(this));
+      this.tracker_.add(
+          this.cloudPrintInterface_,
+          cloudprint.CloudPrintInterface.EventType.PROCESS_INVITE_FAILED,
+          this.onCloudPrintProcessInviteFailed_.bind(this));
+    },
+
+    /** Initiates loading of cloud printer sharing invitations. */
+    startLoadingInvitations: function() {
+      if (!this.cloudPrintInterface_)
+        return;
+      if (!this.userInfo_.activeUser)
+        return;
+      if (this.loadStatus_.hasOwnProperty(this.userInfo_.activeUser)) {
+        if (this.loadStatus_[this.userInfo_.activeUser] ==
+            InvitationStore.LoadStatus_.DONE) {
+          cr.dispatchSimpleEvent(
+              this, InvitationStore.EventType.INVITATION_SEARCH_DONE);
+        }
+        return;
+      }
+
+      this.loadStatus_[this.userInfo_.activeUser] =
+          InvitationStore.LoadStatus_.IN_PROGRESS;
+      this.cloudPrintInterface_.invites(this.userInfo_.activeUser);
+    },
+
+    /**
+     * Accepts or rejects the {@code invitation}, based on {@code accept} value.
+     * @param {!print_preview.Invitation} invitation Invitation to process.
+     * @param {boolean} accept Whether to accept this invitation.
+     */
+    processInvitation: function(invitation, accept) {
+      if (!!this.invitationInProgress_)
+        return;
+      this.invitationInProgress_ = invitation;
+      this.cloudPrintInterface_.processInvite(invitation, accept);
+    },
+
+    /**
+     * Removes processed invitation from the internal storage.
+     * @param {!print_preview.Invitation} invitation Processed invitation.
+     * @private
+     */
+    invitationProcessed_: function(invitation) {
+      if (this.invitations_.hasOwnProperty(invitation.account)) {
+        this.invitations_[invitation.account] =
+            this.invitations_[invitation.account].filter(function(i) {
+              return i != invitation;
+            });
+      }
+      if (this.invitationInProgress_ == invitation)
+        this.invitationInProgress_ = null;
+    },
+
+    /**
+     * Called when printer sharing invitations are fetched.
+     * @param {Event} event Contains the list of invitations.
+     * @private
+     */
+    onCloudPrintInvitesDone_: function(event) {
+      this.loadStatus_[event.user] = InvitationStore.LoadStatus_.DONE;
+      this.invitations_[event.user] = event.invitations;
+
+      cr.dispatchSimpleEvent(
+          this, InvitationStore.EventType.INVITATION_SEARCH_DONE);
+    },
+
+    /**
+     * Called when printer sharing invitations fetch has failed.
+     * @param {Event} event Contains the reason of failure.
+     * @private
+     */
+    onCloudPrintInvitesFailed_: function(event) {
+      this.loadStatus_[event.user] = InvitationStore.LoadStatus_.FAILED;
+    },
+
+    /**
+     * Called when printer sharing invitation was processed successfully.
+     * @param {Event} event Contains detailed information about the invite and
+     *     newly accepted destination.
+     * @private
+     */
+    onCloudPrintProcessInviteDone_: function(event) {
+      this.invitationProcessed_(event.invitation);
+      cr.dispatchSimpleEvent(
+          this, InvitationStore.EventType.INVITATION_PROCESSED);
+    },
+
+    /**
+     * Called when /printer call completes. Updates the specified destination's
+     * print capabilities.
+     * @param {Event} event Contains detailed information about the
+     *     destination.
+     * @private
+     */
+    onCloudPrintProcessInviteFailed_: function(event) {
+      this.invitationProcessed_(event.invitation);
+      // TODO: Display an error.
+      cr.dispatchSimpleEvent(
+          this, InvitationStore.EventType.INVITATION_PROCESSED);
+    }
+  };
+
+  // Export
+  return {
+    InvitationStore: InvitationStore
+  };
+});