How to use the stream-mmmagic function in stream-mmmagic
To help you get started, we’ve selected a few stream-mmmagic examples, based on popular ways it is used in public projects.
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oohnoitz / jii / lib / storage / gridfs.js View on Github 
save(file, readStream, cb) {
debug('save', file)
if (file.metadata.secure && (!file.crypto.algorithm || !file.crypto.passphrase)) {
return cb('You did not provide a valid crypto algorithm and/or passphrase.')
}
detectMime(readStream, (err, mime, dataStream) => {
if (err) {
return cb(err)
}
// set default mime value if libmagic fails
if (mime === null) {
mime = { type: 'application/octet-stream' }
}
// perform additional lookup when mime type is text/plain
mime.type = mime.type === 'text/plain'
? mimeType.lookup(file.filename) || 'text/plain'
: mime.type
// detect if file is blacklisted
const { blacklist } = this._storageConfigsave(file, readStream, cb) {
debug('save', file)
if (file.metadata.secure && (!file.crypto.algorithm || !file.crypto.passphrase)) {
return cb('You did not provide a valid crypto algorithm and/or passphrase.')
}
detectMime(readStream, (err, mime, dataStream) => {
if (err) {
return cb(err)
}
// set default mime value if libmagic fails
if (mime === null) {
mime = { type: 'application/octet-stream' }
}
// perform additional lookup when mime type is text/plain
mime.type = mime.type === 'text/plain'
? mimeType.lookup(file.filename) || 'text/plain'
: mime.type
// detect if file is blacklisted
const { blacklist } = this._storageConfigstream-mmmagic
sniff the start of a stream (non-destructively) to detect the file type and encoding
