332 lines
9.1 KiB
JavaScript
332 lines
9.1 KiB
JavaScript
/**
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* Google related utils.
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* Depends upon:
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* - https://apis.google.com/js/api.js: auth and picker
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* - https://apis.google.com/js/client.js: drive and request
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*/
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var dwv = dwv || {};
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/** @namespace */
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dwv.google = dwv.google || {};
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// external
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var gapi = gapi || {};
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var google = google || {};
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/**
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* Google Authentification class.
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* Allows to authentificate to google services.
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*/
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dwv.google.Auth = function ()
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{
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// closure to self
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var self = this;
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// immediate mode: behind the scenes token refresh
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var immediate = false;
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// The Client ID obtained from the Google Developers Console. Replace with your own Client ID.
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this.clientId = "544445548355-7pli7rbg578hslnngnkj7ledcg6g5ejo.apps.googleusercontent.com";
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// The scope to use to access user's Drive items.
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this.scope = ['https://www.googleapis.com/auth/drive.readonly'];
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/**
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* Load the API and authentify.
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*/
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this.load = function () {
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immediate = false;
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gapi.load('auth', {'callback': onApiLoad});
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};
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/**
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* Load the API and authentify silently.
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*/
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this.loadSilent = function () {
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immediate = true;
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gapi.load('auth', {'callback': onApiLoad});
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};
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/**
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* Called if the authentification is successful.
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* Default does nothing. No input parameters.
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*/
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this.onload = function () {};
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/**
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* Callback to be overloaded.
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* Default does nothing. No input parameters.
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*/
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this.onfail = function () {};
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/**
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* Authentificate.
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*/
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function onApiLoad() {
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// see https://developers.google.com/api-client-library/...
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// ...javascript/reference/referencedocs#gapiauthauthorizeparams
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gapi.auth.authorize({
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'client_id': self.clientId,
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'scope': self.scope,
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'immediate': immediate
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},
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handleResult
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);
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}
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/**
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* Launch callback if all good.
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* @param {Object} authResult An OAuth 2.0 Token Object.
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* See https://developers.google.com/api-client-library/...
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* ...javascript/reference/referencedocs#OAuth20TokenObject
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*/
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function handleResult(authResult) {
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if (authResult && !authResult.error) {
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self.onload();
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}
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else {
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self.onfail();
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}
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}
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};
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/**
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* Google Picker class.
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* Allows to create a picker and handle its result.
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*/
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dwv.google.Picker = function ()
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{
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// closure to self
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var self = this;
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/**
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* Load API and create picker.
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*/
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this.load = function () {
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gapi.load('picker', {'callback': onApiLoad});
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};
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/**
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* Called after user picked files.
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* @param {Array} ids The list of picked files ids.
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*/
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this.onload = null;
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/**
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* Create the picker.
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*/
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function onApiLoad() {
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var view = new google.picker.View(google.picker.ViewId.DOCS);
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view.setMimeTypes("application/dicom");
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// see https://developers.google.com/picker/docs/reference#PickerBuilder
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var picker = new google.picker.PickerBuilder()
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.enableFeature(google.picker.Feature.NAV_HIDDEN)
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.enableFeature(google.picker.Feature.MULTISELECT_ENABLED)
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.setOAuthToken(gapi.auth.getToken().access_token)
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.addView(view)
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.setCallback(handleResult)
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.build();
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picker.setVisible(true);
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}
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/**
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* Launch callback if all good.
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* @param {Object} data The data returned by the picker.
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* See https://developers.google.com/picker/docs/results
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*/
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function handleResult(data) {
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if (data.action === google.picker.Action.PICKED &&
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data.docs.length !== 0 ) {
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var ids = [];
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for (var i = 0; i < data.docs.length; ++i) {
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ids[ids.length] = data.docs[i].id;
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}
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self.onload(ids);
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}
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}
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};
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/**
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* Google Drive class.
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* Allows to request google drive for file download links from a list of file ids.
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*/
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dwv.google.Drive = function ()
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{
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// closure to self
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var self = this;
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// list of ids
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var idList = null;
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// The Browser API key obtained from the Google Developers Console.
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this.apiKey = 'AIzaSyA5YAedAwoQsBZ-TzVEEVkv2ezD5hqe4s0';
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/**
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* Set the ids to ask for download link.
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* @param {Array} ids The list of file ids to ask for download link.
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*/
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this.setIds = function (ids) {
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idList = ids;
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};
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/**
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* Get the ids to ask for download link.
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*/
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this.getIds = function () {
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return idList;
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};
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/**
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* Load API and query drive for download links.
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* @param {Array} ids The list of file ids to ask for download link.
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*/
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this.loadIds = function (ids) {
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self.setIds(ids);
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self.load();
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};
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/**
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* Load API and query drive for download links.
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* The ids to ask for have been provided via the setIds.
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*/
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this.load = function () {
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// set the api key
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gapi.client.setApiKey(self.apiKey);
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var func = createApiLoad(self.getIds());
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gapi.client.load('drive', 'v3', func);
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};
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/**
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* Called after drive response with the file urls.
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* @param {Array} urls The list of files urls corresponding to the input ids.
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*/
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this.onload = null;
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/**
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* Create an API load handler.
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* @param {Array} ids The list of file ids to ask for download link.
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*/
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function createApiLoad(ids) {
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var f = function () { onApiLoad(ids); };
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return f;
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}
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/**
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* Run the drive request.
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* @param {Array} ids The list of file ids to ask for download link.
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*/
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function onApiLoad(ids) {
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// group requests in batch (ans stay bellow quotas)
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var batch = gapi.client.newBatch();
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for (var i = 0; i < ids.length; ++i) {
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// Can't make it work, HTTPRequest sends CORS error...
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// see https://developers.google.com/drive/v3/reference/files/get
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//var request = gapi.client.drive.files.get({
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// 'fileId': fileId, 'fields': 'webViewLink'
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//});
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// File path with v2??
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// see https://developers.google.com/api-client-library/...
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// ...javascript/reference/referencedocs#gapiclientrequestargs
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var request = gapi.client.request({
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'path': '/drive/v2/files/' + ids[i],
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'method': 'GET'
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});
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// add to batch
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batch.add(request);
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}
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// execute the batch
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batch.execute( handleDriveLoad );
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}
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/**
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* Launch callback when all queries have returned.
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* @param {Object} resp The batch request response.
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* See https://developers.google.com/api-client-library/...
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* ...javascript/reference/referencedocs#gapiclientRequestexecute
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*/
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function handleDriveLoad(resp) {
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// link list
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var urls = [];
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// ID-response map of each requests response
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var respKeys = Object.keys(resp);
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for ( var i = 0; i < respKeys.length; ++i ) {
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urls[urls.length] = resp[respKeys[i]].result.downloadUrl;
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}
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// call onload
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self.onload(urls);
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}
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};
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/**
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* Append authorized header to the input callback arguments.
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* @param {Function} callback The callback to append headers to.
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*/
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dwv.google.getAuthorizedCallback = function (callback) {
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var func = function (urls) {
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//see https://developers.google.com/api-client-library/javascript/features/cors
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var header = {
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"name": "Authorization",
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"value": "Bearer " + gapi.auth.getToken().access_token
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};
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callback(urls, [header]);
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};
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return func;
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};
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/**
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* GoogleDriveLoad gui.
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* @constructor
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*/
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dwv.gui.GoogleDriveLoad = function (app)
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{
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/**
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* Setup the gdrive load HTML to the page.
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*/
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this.setup = function()
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{
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// behind the scenes authentification to avoid popup blocker
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var gAuth = new dwv.google.Auth();
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gAuth.loadSilent();
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// associated div
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var gdriveLoadDiv = document.createElement("div");
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gdriveLoadDiv.className = "gdrivediv";
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gdriveLoadDiv.style.display = "none";
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// node
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var node = app.getElement("loaderlist");
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// append
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node.appendChild(gdriveLoadDiv);
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// refresh
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dwv.gui.refreshElement(node);
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};
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/**
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* Display the file load HTML.
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* @param {Boolean} bool True to display, false to hide.
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*/
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this.display = function (bool)
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{
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// gdrive div element
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var node = app.getElement("loaderlist");
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var filediv = node.getElementsByClassName("gdrivediv")[0];
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filediv.style.display = bool ? "" : "none";
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if (bool) {
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// jquery mobile dependent
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$("#popupOpen").popup("close");
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app.resetLoadbox();
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var gAuth = new dwv.google.Auth();
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var gPicker = new dwv.google.Picker();
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var gDrive = new dwv.google.Drive();
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// pipeline
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gAuth.onload = gPicker.load;
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gPicker.onload = gDrive.loadIds;
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gDrive.onload = dwv.google.getAuthorizedCallback(app.loadURLs);
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// launch
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gAuth.load();
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}
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};
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};
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