File & Uploads Validators

const isPNG = (buffer: Uint8Array): boolean => {
  const signature = [137, 80, 78, 71, 13, 10, 26, 10];
  return buffer.length >= 8 && signature.every((b, i) => buffer[i] === b);
};

const isJPEG = (buffer: Uint8Array): boolean => buffer[0] === 0xFF && buffer[1] === 0xD8 && buffer[2] === 0xFF;

const isValidFileSize = (bytes: number, maxMB: number): boolean => bytes <= maxMB * 1024 * 1024;

const getExtension = (filename: string): string => filename.slice(((filename.lastIndexOf('.') - 1) >>> 0) + 2);

const isValid = (s: string): boolean => /^.+\.pdf$/.test(s);

const isValid = (s: string): boolean => /^.+\.doc$/.test(s);

const isValid = (s: string): boolean => /^.+\.docx$/.test(s);

const isValid = (s: string): boolean => /^.+\.csv$/.test(s);

const isValid = (s: string): boolean => /^.+\.json$/.test(s);

const isValid = (s: string): boolean => /^.+\.xml$/.test(s);

const isValid = (s: string): boolean => /^.+\.html$/.test(s);

const isValid = (s: string): boolean => /^.+\.js$/.test(s);

const isValid = (s: string): boolean => /^.+\.ts$/.test(s);

const isValid = (s: string): boolean => /^.+\.php$/.test(s);

const isValid = (s: string): boolean => /^.+\.py$/.test(s);

const isValid = (s: string): boolean => /^.+\.go$/.test(s);

const isValid = (s: string): boolean => /^.+\.sql$/.test(s);

const isValid = (s: string): boolean => /^.+\.zip$/.test(s);

const isValid = (s: string): boolean => /^.+\.tar$/.test(s);

const isValid = (s: string): boolean => /^.+\.gz$/.test(s);

const isValid = (s: string): boolean => /^.+\.mp3$/.test(s);

const isValid = (s: string): boolean => /^.+\.mp4$/.test(s);

const isValid = (s: string): boolean => /^.+\.jpg$/.test(s);

const isValid = (s: string): boolean => /^.+\.png$/.test(s);

const isValid = (s: string): boolean => /^.+\.svg$/.test(s);