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[eeg_modelling] Support import events from JSON
PiperOrigin-RevId: 245494127
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| // Copyright 2019 The Google Research Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| /** | ||
| * @fileoverview Allows uploading data from a JSON file to the store. | ||
| */ | ||
|
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| goog.module('eeg_modelling.eeg_viewer.Uploader'); | ||
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| const Dispatcher = goog.require('eeg_modelling.eeg_viewer.Dispatcher'); | ||
| const Downloader = goog.require('eeg_modelling.eeg_viewer.Downloader'); | ||
| const HtmlSanitizer = goog.require('goog.html.sanitizer.HtmlSanitizer'); | ||
| const SafeHtml = goog.require('goog.html.SafeHtml'); | ||
| const utils = goog.require('eeg_modelling.eeg_viewer.utils'); | ||
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| class Uploader { | ||
| constructor() { | ||
| /** @private {string} */ | ||
| this.containerId_ = 'uploader-modal'; | ||
| /** @private {string} */ | ||
| this.fileInputId_ = 'uploader-file-input'; | ||
| /** @private {string} */ | ||
| this.textDisplayId_ = 'uploader-text-display'; | ||
| } | ||
|
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| /** | ||
| * Dispatches an error with a given message. | ||
| * @param {string} message Message to send in the error. | ||
| * @private | ||
| */ | ||
| dispatchError_(message) { | ||
| Dispatcher.getInstance().sendAction({ | ||
| actionType: Dispatcher.ActionType.ERROR, | ||
| data: { | ||
| message, | ||
| }, | ||
| }); | ||
| } | ||
|
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| /** | ||
| * Retrieves the file selected and sends an action to upload it. | ||
| * @return {!Promise} Promise that resolves once the file was read. | ||
| */ | ||
| upload() { | ||
| const input = utils.getInputElement(this.fileInputId_); | ||
| if (input.files.length === 0) { | ||
| this.dispatchError_('No file selected'); | ||
| return Promise.resolve(); | ||
| } | ||
|
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| const file = input.files[0]; | ||
|
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| const reader = new FileReader(); | ||
| return new Promise((resolve) => { | ||
| reader.onload = () => { | ||
| // The file text is sanitized before parsing to prevent code injections. | ||
| // Note that the string can't be escaped to prevent injections, since | ||
| // that would escape the quotes and break the JSON. | ||
|
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| const sanitizer = new HtmlSanitizer(); | ||
|
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| let fileData; | ||
| const text = /** @type {string} */ (reader.result); | ||
| const safeText = SafeHtml.unwrap(sanitizer.sanitize(text)); | ||
|
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| try { | ||
| fileData = JSON.parse(safeText); | ||
| } catch (err) { | ||
| this.dispatchError_('Can\'t parse file as JSON'); | ||
| resolve(); | ||
| return; | ||
| } | ||
|
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| fileData = /** @type {!Downloader.DownloadObject} */ (fileData); | ||
|
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| if (!fileData.store || !fileData.timestamp || !fileData.fileParams) { | ||
| this.dispatchError_('JSON file has missing attributes'); | ||
| resolve(); | ||
| return; | ||
| } | ||
|
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| Dispatcher.getInstance().sendAction({ | ||
| actionType: Dispatcher.ActionType.IMPORT_STORE, | ||
| data: fileData.store, | ||
| }); | ||
|
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| this.closeMenu(); | ||
|
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| resolve(); | ||
| }; | ||
| reader.readAsText(file); | ||
| }); | ||
| } | ||
|
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| /** | ||
| * Sets the text to be displayed. | ||
| * @param {?string} value Text to be displayed. | ||
| * @private | ||
| */ | ||
| setTextDisplay_(value) { | ||
| const textDisplay = utils.getInputElement(this.textDisplayId_); | ||
| textDisplay.value = value || 'No file chosen'; | ||
| } | ||
|
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| /** | ||
| * Handles a change in the hidden file input, which will update the text | ||
| * displayed. | ||
| */ | ||
| handleFileChange() { | ||
| const input = utils.getInputElement(this.fileInputId_); | ||
| if (input.files.length === 0) { | ||
| this.setTextDisplay_(null); | ||
| return; | ||
| } | ||
| this.setTextDisplay_(input.files[0].name); | ||
| } | ||
|
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| /** | ||
| * Closes the modal menu. | ||
| */ | ||
| closeMenu() { | ||
| const fileInput = utils.getInputElement(this.fileInputId_); | ||
| fileInput.value = null; | ||
| this.setTextDisplay_(null); | ||
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| utils.hideElement(this.containerId_); | ||
| } | ||
|
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| /** | ||
| * Opens the modal menu. | ||
| */ | ||
| openMenu() { | ||
| utils.showElement(this.containerId_); | ||
| } | ||
| } | ||
|
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| goog.addSingletonGetter(Uploader); | ||
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| exports = Uploader; |
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