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|
'use strict'
const Router = require('express').Router
const formidable = require('formidable')
const path = require('path')
const FileType = require('file-type')
const fs = require('fs')
const os = require('os')
const rimraf = require('rimraf')
const isSvg = require('is-svg')
const config = require('../../config')
const logger = require('../../logger')
const errors = require('../../errors')
const imageRouter = (module.exports = Router())
async function checkUploadType (filePath) {
const extension = path.extname(filePath).toLowerCase()
let typeFromMagic = await FileType.fromFile(filePath)
if (extension === '.svg' && (typeFromMagic === undefined || typeFromMagic.mime === 'application/xml')) {
const fileContent = fs.readFileSync(filePath)
if (isSvg(fileContent)) {
typeFromMagic = {
ext: 'svg',
mime: 'image/svg+xml'
}
}
}
if (typeFromMagic === undefined) {
logger.error('Image upload error: Could not determine MIME-type')
return false
}
// .jpeg, .jfif, .jpe files are identified by FileType to have the extension jpg
if (['.jpeg', '.jfif', '.jpe'].includes(extension) && typeFromMagic.ext === 'jpg') {
typeFromMagic.ext = extension.substr(1)
}
if (extension !== '.' + typeFromMagic.ext) {
logger.error(
'Image upload error: Provided file extension does not match MIME-type'
)
return false
}
if (!config.allowedUploadMimeTypes.includes(typeFromMagic.mime)) {
logger.error(
`Image upload error: MIME-type "${
typeFromMagic.mime
}" of uploaded file not allowed, only "${config.allowedUploadMimeTypes.join(
', '
)}" are allowed`
)
return false
}
return true
}
// upload image
imageRouter.post('/uploadimage', function (req, res) {
if (
!req.isAuthenticated() &&
!config.allowAnonymous &&
!config.allowAnonymousEdits
) {
logger.error(
'Image upload error: Anonymous edits and therefore uploads are not allowed'
)
return errors.errorForbidden(res)
}
const form = new formidable.IncomingForm()
form.keepExtensions = true
const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'hedgedoc-'))
form.uploadDir = tmpDir
form.parse(req, async function (err, fields, files) {
if (err) {
logger.error(`Image upload error: formidable error: ${err}`)
rimraf(tmpDir)
return errors.errorForbidden(res)
} else if (!files.image || !files.image.path) {
logger.error("Image upload error: Upload didn't contain file)")
rimraf.sync(tmpDir)
return errors.errorBadRequest(res)
} else if (!(await checkUploadType(files.image.path))) {
rimraf.sync(tmpDir)
return errors.errorBadRequest(res)
} else {
logger.debug(
`SERVER received uploadimage: ${JSON.stringify(files.image)}`
)
const uploadProvider = require('./' + config.imageUploadType)
logger.debug(
`imageRouter: Uploading ${files.image.path} using ${config.imageUploadType}`
)
uploadProvider.uploadImage(files.image.path, function (err, url) {
rimraf.sync(tmpDir)
if (err !== null) {
logger.error(err)
return res.status(500).end('upload image error')
}
logger.debug(`SERVER sending ${url} to client`)
res.send({
link: url
})
})
}
})
})
|
