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/** !
* 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
window.gapi.client.setApiKey(this.apiKey)
window.gapi.client.load('drive', 'v2', this._driveApiLoaded.bind(this))
window.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 = window.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 = window.gapi.auth.getToken().access_token
var view = new window.google.picker.DocsView()
view.setMimeTypes('text/markdown,text/html')
view.setIncludeFolders(true)
view.setOwnedByMe(true)
this.picker = new window.google.picker.PickerBuilder()
.enableFeature(window.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[window.google.picker.Response.ACTION] === window.google.picker.Action.PICKED) {
var file = data[window.google.picker.Response.DOCUMENTS][0]
var id = file[window.google.picker.Document.ID]
var request = window.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) {
window.gapi.auth.authorize({
client_id: this.clientId,
scope: 'https://www.googleapis.com/auth/drive.readonly',
immediate: immediate
}, callback || function () {})
}
}
}())
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