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import * as fs from 'fs';
import fileType from 'file-type';
import checkSvg from '../misc/check-svg';
export async function detectMine(path: string) {
return new Promise<[string, string | null]>((res, rej) => {
const readable = fs.createReadStream(path);
readable
.on('error', rej)
.once('data', (buffer: Buffer) => {
readable.destroy();
const type = fileType(buffer);
if (type) {
if (type.mime == 'application/xml' && checkSvg(path)) {
res(['image/svg+xml', 'svg']);
} else {
res([type.mime, type.ext]);
}
} else if (checkSvg(path)) {
res(['image/svg+xml', 'svg']);
} else {
// 種類が同定できなかったら application/octet-stream にする
res(['application/octet-stream', null]);
}
})
.on('end', () => {
// maybe 0 bytes
res(['application/octet-stream', null]);
});
});
}
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