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const config = require('../../../config');
const jetpack = require('fs-jetpack');
const randomstring = require('randomstring');
const path = require('path');
const JWT = require('jsonwebtoken');
const db = require('knex')(config.server.database);
const moment = require('moment');
const log = require('../utils/Log');
const crypto = require('crypto');
const sharp = require('sharp');
const ffmpeg = require('fluent-ffmpeg');
const imageExtensions = ['.jpg', '.jpeg', '.bmp', '.gif', '.png', '.webp'];
const videoExtensions = ['.webm', '.mp4', '.wmv', '.avi', '.mov'];
class Util {
static isExtensionBlocked(extension) {
return config.uploads.blockedExtensions.includes(extension);
}
static generateThumbnails(filename) {
const ext = path.extname(filename).toLowerCase();
const output = `${filename.slice(0, -ext.length)}.png`;
if (imageExtensions.includes(ext)) return this.generateThumbnailForImage(filename, output);
if (videoExtensions.includes(ext)) return this.generateThumbnailForVideo(filename);
return null;
}
/*
static async removeExif(filename) {
This needs more testing.
Even though the exif data seems to be stripped, no other online service
is recognizing the file as an image file.
const ExifTransformer = require('exif-be-gone');
const toStream = require('buffer-to-stream');
const file = await jetpack.readAsync(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, filename), 'buffer');
const writer = jetpack.createWriteStream(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, `${filename}.noexif`));
toStream(file).pipe(new ExifTransformer()).pipe(writer);
}
*/
static async generateThumbnailForImage(filename, output) {
const file = await jetpack.readAsync(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, filename), 'buffer');
await sharp(file)
.resize(64, 64)
.toFormat('png')
.toFile(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, 'thumbs', 'square', output));
await sharp(file)
.resize(225, null)
.toFormat('png')
.toFile(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, 'thumbs', output));
}
static generateThumbnailForVideo(filename) {
ffmpeg(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, filename))
.thumbnail({
timestamps: [0],
filename: '%b.png',
folder: path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, 'thumbs', 'square'),
size: '64x64'
})
.on('error', error => log.error(error.message));
ffmpeg(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, filename))
.thumbnail({
timestamps: [0],
filename: '%b.png',
folder: path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, 'thumbs'),
size: '150x?'
})
.on('error', error => log.error(error.message));
}
static getFileThumbnail(filename) {
const ext = path.extname(filename).toLowerCase();
if (!imageExtensions.includes(ext) && !videoExtensions.includes(ext)) return null;
return `${filename.slice(0, -ext.length)}.png`;
}
static constructFilePublicLink(file) {
file.url = `${config.filesServeLocation}/${file.name}`;
const thumb = this.getFileThumbnail(file.name);
if (thumb) {
file.thumb = `${config.filesServeLocation}/thumbs/${thumb}`;
file.thumbSquare = `${config.filesServeLocation}/thumbs/square/${thumb}`;
}
return file;
}
static getUniqueFilename(name) {
const retry = (i = 0) => {
const filename = randomstring.generate({
length: config.uploads.generatedFilenameLength,
capitalization: 'lowercase'
}) + path.extname(name);
const exists = jetpack.exists(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, filename));
if (!exists) return filename;
if (i < config.uploads.retryFilenameTimes) return retry(i++);
return null;
};
return retry();
}
static getUniqueAlbumIdentifier() {
const retry = async (i = 0) => {
const identifier = randomstring.generate({
length: config.uploads.generatedAlbumLinkLength,
capitalization: 'lowercase'
});
const exists = await db.table('links').where({ identifier }).first();
if (!exists) return identifier;
if (i < config.uploads.retryAlbumLinkTimes) return retry(i++);
return null;
};
return retry();
}
static async getFileHash(filename) {
const file = await jetpack.readAsync(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, filename), 'buffer');
if (!file) {
log.error(`There was an error reading the file < ${filename} > for hashing`);
return null;
}
const hash = crypto.createHash('md5');
hash.update(file, 'utf8');
return hash.digest('hex');
}
static getFilenameFromPath(fullPath) {
return fullPath.replace(/^.*[\\\/]/, ''); // eslint-disable-line no-useless-escape
}
static async deleteFile(filename, deleteFromDB = false) {
try {
await jetpack.removeAsync(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, filename));
if (deleteFromDB) {
await db.table('files').where('name', filename).delete();
}
} catch (error) {
log.error(`There was an error removing the file < ${filename} >`);
log.error(error);
}
}
static async deleteAllFilesFromAlbum(id) {
try {
const files = await db.table('files').where({ albumId: id });
for (const file of files) {
await jetpack.removeAsync(path.join(__dirname, '..', '..', '..', config.uploads.uploadFolder, file));
}
await db.table('files').where({ albumId: id }).delete();
} catch (error) {
log.error(error);
}
}
static isAuthorized(req) {
if (!req.headers.authorization) return false;
const token = req.headers.authorization.split(' ')[1];
if (!token) return false;
return JWT.verify(token, config.server.secret, async (error, decoded) => {
if (error) {
log.error(error);
return false;
}
const id = decoded ? decoded.sub : '';
const iat = decoded ? decoded.iat : '';
const user = await db.table('users').where({ id }).first();
if (!user || !user.enabled) return false;
if (iat && iat < moment(user.passwordEditedAt).format('x')) return false;
return user;
});
}
}
module.exports = Util;
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