From 845ef9bad6b9f5ff471b62505f9e39300297a3a4 Mon Sep 17 00:00:00 2001
From: Cheng-Han, Wu
Date: Fri, 4 Mar 2016 23:17:35 +0800
Subject: Support export to and import from Google Drive

---
 public/js/google-drive-picker.js | 118 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 public/js/google-drive-picker.js

(limited to 'public/js/google-drive-picker.js')

diff --git a/public/js/google-drive-picker.js b/public/js/google-drive-picker.js
new file mode 100644
index 00000000..e653653c
--- /dev/null
+++ b/public/js/google-drive-picker.js
@@ -0,0 +1,118 @@
+/**!
+ * Google Drive File Picker Example
+ * By Daniel Lo Nigro (http://dan.cx/)
+ */
+(function() {
+	/**
+	 * Initialise a Google Driver file picker
+	 */
+	var FilePicker = window.FilePicker = function(options) {
+		// Config
+		this.apiKey = options.apiKey;
+		this.clientId = options.clientId;
+		
+		// Elements
+		this.buttonEl = options.buttonEl;
+		
+		// Events
+		this.onSelect = options.onSelect;
+		this.buttonEl.on('click', this.open.bind(this));		
+	
+		// Disable the button until the API loads, as it won't work properly until then.
+		this.buttonEl.prop('disabled', true);
+
+		// Load the drive API
+		gapi.client.setApiKey(this.apiKey);
+		gapi.client.load('drive', 'v2', this._driveApiLoaded.bind(this));
+		google.load('picker', '1', { callback: this._pickerApiLoaded.bind(this) });
+	}
+
+	FilePicker.prototype = {
+		/**
+		 * Open the file picker.
+		 */
+		open: function() {		
+			// Check if the user has already authenticated
+			var token = gapi.auth.getToken();
+			if (token) {
+				this._showPicker();
+			} else {
+				// The user has not yet authenticated with Google
+				// We need to do the authentication before displaying the Drive picker.
+				this._doAuth(false, function() { this._showPicker(); }.bind(this));
+			}
+		},
+		
+		/**
+		 * Show the file picker once authentication has been done.
+		 * @private
+		 */
+		_showPicker: function() {
+			var accessToken = gapi.auth.getToken().access_token;
+            var view = new google.picker.DocsView();
+            view.setMimeTypes("text/markdown,text/html");
+            view.setIncludeFolders(true);
+			this.picker = new google.picker.PickerBuilder().
+                enableFeature(google.picker.Feature.NAV_HIDDEN).
+				addView(view).
+				setAppId(this.clientId).
+				setOAuthToken(accessToken).
+				setCallback(this._pickerCallback.bind(this)).
+				build().
+				setVisible(true);
+		},
+		
+		/**
+		 * Called when a file has been selected in the Google Drive file picker.
+		 * @private
+		 */
+		_pickerCallback: function(data) {
+			if (data[google.picker.Response.ACTION] == google.picker.Action.PICKED) {
+				var file = data[google.picker.Response.DOCUMENTS][0],
+					id = file[google.picker.Document.ID],
+					request = gapi.client.drive.files.get({
+						fileId: id
+					});
+					
+				request.execute(this._fileGetCallback.bind(this));
+			}
+		},
+		/**
+		 * Called when file details have been retrieved from Google Drive.
+		 * @private
+		 */
+		_fileGetCallback: function(file) {
+			if (this.onSelect) {
+				this.onSelect(file);
+			}
+		},
+		
+		/**
+		 * Called when the Google Drive file picker API has finished loading.
+		 * @private
+		 */
+		_pickerApiLoaded: function() {
+			this.buttonEl.prop('disabled', false);
+		},
+		
+		/**
+		 * Called when the Google Drive API has finished loading.
+		 * @private
+		 */
+		_driveApiLoaded: function() {
+			this._doAuth(true);
+		},
+		
+		/**
+		 * Authenticate with Google Drive via the Google JavaScript API.
+		 * @private
+		 */
+		_doAuth: function(immediate, callback) {	
+			gapi.auth.authorize({
+				client_id: this.clientId,
+				scope: 'https://www.googleapis.com/auth/drive.readonly',
+				immediate: immediate
+			}, callback ? callback : function() {});
+		}
+	};
+}());
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