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-rw-r--r--public/js/google-drive-upload.js267
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diff --git a/public/js/google-drive-upload.js b/public/js/google-drive-upload.js
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-/* eslint-env browser, jquery */
-/**
- * Helper for implementing retries with backoff. Initial retry
- * delay is 1 second, increasing by 2x (+jitter) for subsequent retries
- *
- * @constructor
- */
-var RetryHandler = function () {
- this.interval = 1000 // Start at one second
- this.maxInterval = 60 * 1000 // Don't wait longer than a minute
-}
-
-/**
- * Invoke the function after waiting
- *
- * @param {function} fn Function to invoke
- */
-RetryHandler.prototype.retry = function (fn) {
- setTimeout(fn, this.interval)
- this.interval = this.nextInterval_()
-}
-
-/**
- * Reset the counter (e.g. after successful request.)
- */
-RetryHandler.prototype.reset = function () {
- this.interval = 1000
-}
-
-/**
- * Calculate the next wait time.
- * @return {number} Next wait interval, in milliseconds
- *
- * @private
- */
-RetryHandler.prototype.nextInterval_ = function () {
- var interval = this.interval * 2 + this.getRandomInt_(0, 1000)
- return Math.min(interval, this.maxInterval)
-}
-
-/**
- * Get a random int in the range of min to max. Used to add jitter to wait times.
- *
- * @param {number} min Lower bounds
- * @param {number} max Upper bounds
- * @private
- */
-RetryHandler.prototype.getRandomInt_ = function (min, max) {
- return Math.floor(Math.random() * (max - min + 1) + min)
-}
-
-/**
- * Helper class for resumable uploads using XHR/CORS. Can upload any Blob-like item, whether
- * files or in-memory constructs.
- *
- * @example
- * var content = new Blob(["Hello world"], {"type": "text/plain"});
- * var uploader = new MediaUploader({
- * file: content,
- * token: accessToken,
- * onComplete: function(data) { ... }
- * onError: function(data) { ... }
- * });
- * uploader.upload();
- *
- * @constructor
- * @param {object} options Hash of options
- * @param {string} options.token Access token
- * @param {blob} options.file Blob-like item to upload
- * @param {string} [options.fileId] ID of file if replacing
- * @param {object} [options.params] Additional query parameters
- * @param {string} [options.contentType] Content-type, if overriding the type of the blob.
- * @param {object} [options.metadata] File metadata
- * @param {function} [options.onComplete] Callback for when upload is complete
- * @param {function} [options.onProgress] Callback for status for the in-progress upload
- * @param {function} [options.onError] Callback if upload fails
- */
-var MediaUploader = function (options) {
- var noop = function () {}
- this.file = options.file
- this.contentType = options.contentType || this.file.type || 'application/octet-stream'
- this.metadata = options.metadata || {
- 'title': this.file.name,
- 'mimeType': this.contentType
- }
- this.token = options.token
- this.onComplete = options.onComplete || noop
- this.onProgress = options.onProgress || noop
- this.onError = options.onError || noop
- this.offset = options.offset || 0
- this.chunkSize = options.chunkSize || 0
- this.retryHandler = new RetryHandler()
-
- this.url = options.url
- if (!this.url) {
- var params = options.params || {}
- params.uploadType = 'resumable'
- this.url = this.buildUrl_(options.fileId, params, options.baseUrl)
- }
- this.httpMethod = options.fileId ? 'PUT' : 'POST'
-}
-
-/**
- * Initiate the upload.
- */
-MediaUploader.prototype.upload = function () {
- var xhr = new XMLHttpRequest()
-
- xhr.open(this.httpMethod, this.url, true)
- xhr.setRequestHeader('Authorization', 'Bearer ' + this.token)
- xhr.setRequestHeader('Content-Type', 'application/json')
- xhr.setRequestHeader('X-Upload-Content-Length', this.file.size)
- xhr.setRequestHeader('X-Upload-Content-Type', this.contentType)
-
- xhr.onload = function (e) {
- if (e.target.status < 400) {
- var location = e.target.getResponseHeader('Location')
- this.url = location
- this.sendFile_()
- } else {
- this.onUploadError_(e)
- }
- }.bind(this)
- xhr.onerror = this.onUploadError_.bind(this)
- xhr.send(JSON.stringify(this.metadata))
-}
-
-/**
- * Send the actual file content.
- *
- * @private
- */
-MediaUploader.prototype.sendFile_ = function () {
- var content = this.file
- var end = this.file.size
-
- if (this.offset || this.chunkSize) {
- // Only bother to slice the file if we're either resuming or uploading in chunks
- if (this.chunkSize) {
- end = Math.min(this.offset + this.chunkSize, this.file.size)
- }
- content = content.slice(this.offset, end)
- }
-
- var xhr = new XMLHttpRequest()
- xhr.open('PUT', this.url, true)
- xhr.setRequestHeader('Content-Type', this.contentType)
- xhr.setRequestHeader('Content-Range', 'bytes ' + this.offset + '-' + (end - 1) + '/' + this.file.size)
- xhr.setRequestHeader('X-Upload-Content-Type', this.file.type)
- if (xhr.upload) {
- xhr.upload.addEventListener('progress', this.onProgress)
- }
- xhr.onload = this.onContentUploadSuccess_.bind(this)
- xhr.onerror = this.onContentUploadError_.bind(this)
- xhr.send(content)
-}
-
-/**
- * Query for the state of the file for resumption.
- *
- * @private
- */
-MediaUploader.prototype.resume_ = function () {
- var xhr = new XMLHttpRequest()
- xhr.open('PUT', this.url, true)
- xhr.setRequestHeader('Content-Range', 'bytes */' + this.file.size)
- xhr.setRequestHeader('X-Upload-Content-Type', this.file.type)
- if (xhr.upload) {
- xhr.upload.addEventListener('progress', this.onProgress)
- }
- xhr.onload = this.onContentUploadSuccess_.bind(this)
- xhr.onerror = this.onContentUploadError_.bind(this)
- xhr.send()
-}
-
-/**
- * Extract the last saved range if available in the request.
- *
- * @param {XMLHttpRequest} xhr Request object
- */
-MediaUploader.prototype.extractRange_ = function (xhr) {
- var range = xhr.getResponseHeader('Range')
- if (range) {
- this.offset = parseInt(range.match(/\d+/g).pop(), 10) + 1
- }
-}
-
-/**
- * Handle successful responses for uploads. Depending on the context,
- * may continue with uploading the next chunk of the file or, if complete,
- * invokes the caller's callback.
- *
- * @private
- * @param {object} e XHR event
- */
-MediaUploader.prototype.onContentUploadSuccess_ = function (e) {
- if (e.target.status === 200 || e.target.status === 201) {
- this.onComplete(e.target.response)
- } else if (e.target.status === 308) {
- this.extractRange_(e.target)
- this.retryHandler.reset()
- this.sendFile_()
- } else {
- this.onContentUploadError_(e)
- }
-}
-
-/**
- * Handles errors for uploads. Either retries or aborts depending
- * on the error.
- *
- * @private
- * @param {object} e XHR event
- */
-MediaUploader.prototype.onContentUploadError_ = function (e) {
- if (e.target.status && e.target.status < 500) {
- this.onError(e.target.response)
- } else {
- this.retryHandler.retry(this.resume_.bind(this))
- }
-}
-
-/**
- * Handles errors for the initial request.
- *
- * @private
- * @param {object} e XHR event
- */
-MediaUploader.prototype.onUploadError_ = function (e) {
- this.onError(e.target.response) // TODO - Retries for initial upload
-}
-
-/**
- * Construct a query string from a hash/object
- *
- * @private
- * @param {object} [params] Key/value pairs for query string
- * @return {string} query string
- */
-MediaUploader.prototype.buildQuery_ = function (params) {
- params = params || {}
- return Object.keys(params).map(function (key) {
- return encodeURIComponent(key) + '=' + encodeURIComponent(params[key])
- }).join('&')
-}
-
-/**
- * Build the drive upload URL
- *
- * @private
- * @param {string} [id] File ID if replacing
- * @param {object} [params] Query parameters
- * @return {string} URL
- */
-MediaUploader.prototype.buildUrl_ = function (id, params, baseUrl) {
- var url = baseUrl || 'https://www.googleapis.com/upload/drive/v2/files/'
- if (id) {
- url += id
- }
- var query = this.buildQuery_(params)
- if (query) {
- url += '?' + query
- }
- return url
-}
-
-window.MediaUploader = MediaUploader