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/* eslint-disable no-underscore-dangle */
'use strict';
const fs = require('fs');
const crypto = require('crypto');
const { EventEmitter } = require('events');
class PersistentFile extends EventEmitter {
constructor({ filepath, newFilename, originalFilename, mimetype, hashAlgorithm }) {
super();
this.lastModifiedDate = null;
Object.assign(this, { filepath, newFilename, originalFilename, mimetype, hashAlgorithm });
this.size = 0;
this._writeStream = null;
if (typeof this.hashAlgorithm === 'string') {
this.hash = crypto.createHash(this.hashAlgorithm);
} else {
this.hash = null;
}
}
open() {
this._writeStream = new fs.WriteStream(this.filepath);
this._writeStream.on('error', (err) => {
this.emit('error', err);
});
}
toJSON() {
const json = {
size: this.size,
filepath: this.filepath,
newFilename: this.newFilename,
mimetype: this.mimetype,
mtime: this.lastModifiedDate,
length: this.length,
originalFilename: this.originalFilename,
};
if (this.hash && this.hash !== '') {
json.hash = this.hash;
}
return json;
}
toString() {
return `PersistentFile: ${this._file.newFilename}, Original: ${this._file.originalFilename}, Path: ${this._file.filepath}`;
}
write(buffer, cb) {
if (this.hash) {
this.hash.update(buffer);
}
if (this._writeStream.closed) {
cb();
return;
}
this._writeStream.write(buffer, () => {
this.lastModifiedDate = new Date();
this.size += buffer.length;
this.emit('progress', this.size);
cb();
});
}
end(cb) {
if (this.hash) {
this.hash = this.hash.digest('hex');
}
this._writeStream.end(() => {
this.emit('end');
cb();
});
}
destroy() {
this._writeStream.destroy();
fs.unlink(this.filepath, () => {});
}
}
module.exports = PersistentFile;
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