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https://github.com/balena-io/etcher.git
synced 2025-04-21 22:07:18 +00:00
becca2d05e
Using `mime-types` in that place made it impossible to use other other file extensions like `.sdcard` and have them treated as `application/octet-stream` when drag and dropping images into Etcher. This moves the fallback logic in `lib/image-stream` to `.getFromFilePath()`, to still facilitate proper MIME type detection, while allowing it to fall back to the octet-stream handler, if there's no available handler for a specific type. Change-Type: patch Changelog-Entry: Fix not treating unknown images as octet-stream
96 lines
2.5 KiB
JavaScript
96 lines
2.5 KiB
JavaScript
/*
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* Copyright 2016 resin.io
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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const _ = require('lodash');
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const Bluebird = require('bluebird');
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const fileType = require('file-type');
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const mime = require('mime-types');
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const fs = require('fs');
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/**
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* @summary Get archive mime type
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* @function
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* @public
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*
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* @param {String} filename - file path
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* @fulfil {String} - mime type
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* @returns {Promise}
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*
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* @example
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* utils.getArchiveMimeType('path/to/raspberrypi.img.gz').then((mimeType) => {
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* console.log(mimeType);
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* });
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*/
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exports.getArchiveMimeType = (filename) => {
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const MIME_TYPE_RAW_IMAGE = 'application/octet-stream';
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const mimeType = mime.lookup(filename);
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if (mimeType) {
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return Bluebird.resolve(mimeType);
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}
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const FILE_TYPE_ID_BYTES = 262;
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return Bluebird.using(fs.openAsync(filename, 'r').disposer((fileDescriptor) => {
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return fs.closeAsync(fileDescriptor);
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}), (fileDescriptor) => {
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const BUFFER_START = 0;
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const buffer = Buffer.alloc(FILE_TYPE_ID_BYTES);
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return fs.readAsync(fileDescriptor, buffer, BUFFER_START, FILE_TYPE_ID_BYTES, null).then(() => {
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return _.get(fileType(buffer), [ 'mime' ], MIME_TYPE_RAW_IMAGE);
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});
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});
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};
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/**
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* @summary Extract the data of a readable stream
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* @function
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* @public
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*
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* @description
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* You should be careful when using this function, since you can only
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* extract files that are not bigger than the available computer memory.
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*
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* @param {StreamReadable} stream - stream
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* @fulfil {Buffer} - data
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* @returns {Promise}
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*
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* @example
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* const stream = fs.createReadStream('./foo/bar');
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*
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* utils.extractStream(stream).then((data) => {
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* console.log(data.toString());
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* });
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*/
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exports.extractStream = (stream) => {
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return new Bluebird((resolve, reject) => {
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const chunks = [];
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stream.on('data', (chunk) => {
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chunks.push(chunk);
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});
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stream.on('error', reject);
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stream.on('end', () => {
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resolve(Buffer.concat(chunks));
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});
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});
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};
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