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node-detect-content-type's Introduction

detect-content-type

Javascript module to determine the Content-Type of the given data, using the algorithm specified in the MIME Sniffing Standard.

This module is useful in cases where it is not possible to determine the Content-Type of the data using filename extension, either because file does not have an extension or the filename is not available.

Installation

npm install detect-content-type

or

yarn add detect-content-type

Import

ES2015 and above:

import detectContentType from 'detect-content-type'

Using CommonJS:

var detectContentType = require('detect-content-type')

Usage

detectContentType takes a Buffer, and determines its Content-Type. It considers at most 512 bytes of data. detectContentType always returns a valid MIME type. If it cannot determine a more specific one, it returns application/octet-stream.

let ct = detectContentType(Buffer.from("<html><body></body></html>")) // returns 'text/html; charset=utf-8'

Credits

The code in this module is ported nearly line-by-line from the http.DetectContentType method in the Go standard library.

node-detect-content-type's People

Contributors

deepakjois avatar dependabot[bot] avatar envek avatar

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node-detect-content-type's Issues

Clean up code that is used to create buffers

Both index.js and test.js have some ugliness because of the way the code was ported from Go.

Here is an example:

  {
    desc: 'WAV audio #1',
    data: Buffer.concat([
      Buffer.from('RIFFb'),
      Buffer.from([0xb8, 0x00, 0x00]),
      Buffer.from('WAVEfmt '),
      Buffer.from([0x12, 0x00, 0x00, 0x00, 0x06])
    ]),
    contentType: 'audio/wave'
},

The problem is that Go strings with \x?? in them get encoded to bytes differently from Javascript strings with \x?? in them. In Javascript, something like \xff uses 2 bytes in a Buffer, but \x00 takes one byte. As a result, we need to have code like above to make sure Go byte buffers translate to equivalent Javascript byte buffers.

As part of cleanup:

  • try and find a better idiom for code written above
  • Cleanup all \x00 in Javascript code because it can get confusing. It is not obvious upfront how many bytes does a given hexademical escape sequence take up

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