misskey/src/api/common/add-file-to-drive.ts

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import * as mongodb from 'mongodb';
import * as crypto from 'crypto';
import * as gm from 'gm';
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import * as debug from 'debug';
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import fileType = require('file-type');
import prominence = require('prominence');
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import DriveFile, { getGridFSBucket } from '../models/drive-file';
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import DriveFolder from '../models/drive-folder';
import serialize from '../serializers/drive-file';
import event from '../event';
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import config from '../../conf';
import { Buffer } from 'buffer';
import * as fs from 'fs';
import * as tmp from 'tmp';
import * as stream from 'stream';
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const log = debug('misskey:register-drive-file');
const tmpFile = (): Promise<string> => new Promise((resolve, reject) => {
tmp.file((e, path) => {
if (e) return reject(e)
resolve(path)
})
})
const addToGridFS = (name: string, readable: stream.Readable, type: string, metadata: any): Promise<any> =>
getGridFSBucket()
.then(bucket => new Promise((resolve, reject) => {
const writeStream = bucket.openUploadStream(name, { contentType: type, metadata });
writeStream.once('finish', (doc) => { resolve(doc); });
writeStream.on('error', reject);
readable.pipe(writeStream);
}))
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/**
* Add file to drive
*
* @param user User who wish to add file
* @param file File path, binary, or readableStream
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* @param comment Comment
* @param type File type
* @param folderId Folder ID
* @param force If set to true, forcibly upload the file even if there is a file with the same hash.
* @return Object that represents added file
*/
export default (
user: any,
file: string | Buffer | stream.Readable,
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name: string = null,
comment: string = null,
folderId: mongodb.ObjectID = null,
force: boolean = false
) => new Promise<any>((resolve, reject) => {
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log(`registering ${name} (user: ${user.username})`);
// Get file path
new Promise((res: (v: string) => void, rej) => {
if (typeof file === 'string') {
res(file)
return
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}
if (file instanceof Buffer) {
tmpFile()
.then(path => {
fs.writeFile(path, file, (err) => {
if (err) rej(err)
res(path)
})
})
.catch(rej)
return
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}
if (typeof file === 'object' && typeof file.read === 'function') {
tmpFile()
.then(path => {
const readable: stream.Readable = file
const writable = fs.createWriteStream(path)
readable
.on('error', rej)
.on('end', () => {
res(path)
})
.pipe(writable)
.on('error', rej)
})
.catch(rej)
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}
rej(new Error('un-compatible file.'))
})
// Calculate hash, get content type and get file size
.then(path => Promise.all([
path,
// hash
((): Promise<string> => new Promise((res, rej) => {
const readable = fs.createReadStream(path)
const hash = crypto.createHash('md5')
readable
.on('error', rej)
.on('end', () => {
res(hash.digest('hex'))
})
.pipe(hash)
.on('error', rej)
}))(),
// mime
((): Promise<[string, string | null]> => new Promise((res, rej) => {
const readable = fs.createReadStream(path)
readable
.on('error', rej)
.once('data', (buffer: Buffer) => {
readable.destroy()
const type = fileType(buffer)
if (!type) {
return res(['application/octet-stream', null])
}
return res([type.mime, type.ext])
})
}))(),
// size
((): Promise<number> => new Promise((res, rej) => {
fs.stat(path, (err, stats) => {
if (err) return rej(err)
res(stats.size)
})
}))()
]))
.then(async ([path, hash, [mime, ext], size]) => {
log(`hash: ${hash}, mime: ${mime}, ext: ${ext}, size: ${size}`)
// detect name
const detectedName: string = name || (ext ? `untitled.${ext}` : 'untitled');
if (!force) {
// Check if there is a file with the same hash
const much = await DriveFile.findOne({
md5: hash,
'metadata.user_id': user._id
});
if (much !== null) {
log('file with same hash is found');
return resolve(much);
} else {
log('file with same hash is not found');
}
}
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const [properties, folder] = await Promise.all([
// properties
(async () => {
if (!/^image\/.*$/.test(mime)) {
return null
}
// If the file is an image, calculate width and height to save in property
const g = gm(data, name);
const size = await prominence(g).size();
const properties = {
width: size.width,
height: size.height
};
log('image width and height is calculated');
return properties
})(),
// folder
(async () => {
if (!folderId) {
return null
}
const driveFolder = await DriveFolder.findOne({
_id: folderId,
user_id: user._id
})
if (!driveFolder) {
throw 'folder-not-found'
}
return driveFolder
})(),
// usage checker
(async () => {
// Calculate drive usage
const usage = await DriveFile
.aggregate([
{ $match: { 'metadata.user_id': user._id } },
{
$project: {
length: true
}
},
{
$group: {
_id: null,
usage: { $sum: '$length' }
}
}
])
.then((aggregates: any[]) => {
if (aggregates.length > 0) {
return aggregates[0].usage
}
return 0
});
log(`drive usage is ${usage}`);
// If usage limit exceeded
if (usage + size > user.drive_capacity) {
throw 'no-free-space';
}
})()
])
const readable = fs.createReadStream(path)
return addToGridFS(name, readable, mime, {
user_id: user._id,
folder_id: folder !== null ? folder._id : null,
comment: comment,
properties: properties
})
})
.then(file => {
log(`drive file has been created ${file._id}`);
resolve(file)
return serialize(file)
})
.then(serializedFile => {
// Publish drive_file_created event
event(user._id, 'drive_file_created', fileObj);
// Register to search database
if (config.elasticsearch.enable) {
const es = require('../../db/elasticsearch');
es.index({
index: 'misskey',
type: 'drive_file',
id: file._id.toString(),
body: {
name: file.name,
user_id: user._id.toString()
}
});
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}
})
.catch(reject)
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});