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const fs = require('fs');
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const { ForbiddenError } = require('../error');
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const db = require('../service/db');
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const gridfs = require('../service/gridfs');
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const hash = require('../lib/hash.hydro');
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const coll = db.collection('file');
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const collFile = db.collection('fs.files');
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const collChunk = db.collection('fs.chunks');
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function _timestamp() {
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return Math.floor(Number(new Date()) / 1000000);
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}
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async function add(streamOrPath, filename, meta = {}) {
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if (typeof streamOrPath === 'string') streamOrPath = fs.createReadStream(streamOrPath);
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const w = gridfs.openUploadStream(filename);
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await coll.insertOne({ ...meta, _id: w.id });
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await new Promise((resolve, reject) => {
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w.on('error', reject);
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w.on('finish', resolve);
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streamOrPath.pipe(w);
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});
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const c = await gridfs.find({ _id: w.id }).toArray();
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await coll.updateOne({ _id: w.id }, { $set: { md5: c[0].md5, size: c[0].size } });
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return w.id;
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}
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function del(_id) {
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return Promise.all([
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coll.deleteOne({ _id }),
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collFile.deleteOne({ _id }),
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collChunk.deleteMany({ files_id: _id }),
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]);
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}
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async function inc(_id) {
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const doc = await coll.findOneAndUpdate(
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{ _id },
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{ $inc: { count: 1 } },
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{ returnOriginal: false },
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);
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return (doc.value || {}).count;
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}
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async function dec(_id) {
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const file = await coll.findOneAndUpdate(
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{ _id },
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{ $inc: { count: -1 } },
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{ returnOriginal: false },
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);
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if (!file.count) await del(_id);
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return file.count;
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}
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async function get(_id, secret) {
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const file = await coll.findOne({ _id });
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if (typeof secret !== 'undefined') {
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const timestamp = _timestamp();
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if (!hash.check(file.secret, timestamp.toString(), secret)) {
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if (!hash.check(file.secret, timestamp.toString() - 1, secret)) {
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throw new ForbiddenError();
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}
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}
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}
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return gridfs.openDownloadStream(_id);
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}
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function getMeta(_id) {
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return coll.findOne({ _id });
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}
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async function url(_id, name) {
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const file = await coll.findOne({ _id });
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const secret = hash.hash(file.secret, _timestamp().toString());
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if (name) return `/fs/${_id}/${Buffer.from(name).toString('base64')}/${secret}`;
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return `/fs/${_id}/${secret}`;
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}
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global.Hydro.model.file = module.exports = {
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add, get, del, inc, dec, getMeta, url,
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};
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