master
howard 2021-04-23 03:55:33 -07:00
parent 6db59c5758
commit 245ec87ba4
2 changed files with 0 additions and 149 deletions

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/**
* Copyright 2019 Google LLC
*
* 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.
*/
'use strict';
/* exported getFileHandle, getNewFileHandle, readFile, verifyPermission,
writeFile */
/**
* Open a handle to an existing file on the local file system.
*
* @return {!Promise<FileSystemFileHandle>} Handle to the existing file.
*/
function getFileHandle() {
// For Chrome 86 and later...
if ('showOpenFilePicker' in window) {
return window.showOpenFilePicker().then((handles) => handles[0]);
}
// For Chrome 85 and earlier...
return window.chooseFileSystemEntries();
}
/**
* Create a handle to a new (text) file on the local file system.
*
* @return {!Promise<FileSystemFileHandle>} Handle to the new file.
*/
function getNewFileHandle() {
// For Chrome 86 and later...
if ('showSaveFilePicker' in window) {
const opts = {
types: [{
description: 'Text file',
accept: {'text/plain': ['.txt']},
}],
};
return window.showSaveFilePicker(opts);
}
// For Chrome 85 and earlier...
const opts = {
type: 'save-file',
accepts: [{
description: 'Text file',
extensions: ['txt'],
mimeTypes: ['text/plain'],
}],
};
return window.chooseFileSystemEntries(opts);
}
/**
* Reads the raw text from a file.
*
* @param {File} file
* @return {!Promise<string>} A promise that resolves to the parsed string.
*/
function readFile(file) {
// If the new .text() reader is available, use it.
if (file.text) {
return file.text();
}
// Otherwise use the traditional file reading technique.
return _readFileLegacy(file);
}
/**
* Reads the raw text from a file.
*
* @private
* @param {File} file
* @return {Promise<string>} A promise that resolves to the parsed string.
*/
function _readFileLegacy(file) {
return new Promise((resolve) => {
const reader = new FileReader();
reader.addEventListener('loadend', (e) => {
const text = e.srcElement.result;
resolve(text);
});
reader.readAsText(file);
});
}
/**
* Writes the contents to disk.
*
* @param {FileSystemFileHandle} fileHandle File handle to write to.
* @param {string} contents Contents to write.
*/
async function writeFile(fileHandle, contents) {
// Support for Chrome 82 and earlier.
if (fileHandle.createWriter) {
// Create a writer (request permission if necessary).
const writer = await fileHandle.createWriter();
// Write the full length of the contents
await writer.write(0, contents);
// Close the file and write the contents to disk
await writer.close();
return;
}
// For Chrome 83 and later.
// Create a FileSystemWritableFileStream to write to.
const writable = await fileHandle.createWritable();
// Write the contents of the file to the stream.
await writable.write(contents);
// Close the file and write the contents to disk.
await writable.close();
}
/**
* Verify the user has granted permission to read or write to the file, if
* permission hasn't been granted, request permission.
*
* @param {FileSystemFileHandle} fileHandle File handle to check.
* @param {boolean} withWrite True if write permission should be checked.
* @return {boolean} True if the user has granted read/write permission.
*/
async function verifyPermission(fileHandle, withWrite) {
const opts = {};
if (withWrite) {
opts.writable = true;
// For Chrome 86 and later...
opts.mode = 'readwrite';
}
// Check if we already have permission, if so, return true.
if (await fileHandle.queryPermission(opts) === 'granted') {
return true;
}
// Request permission to the file, if the user grants permission, return true.
if (await fileHandle.requestPermission(opts) === 'granted') {
return true;
}
// The user did nt grant permission, return false.
return false;
}

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