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Utilities for handling media (MIME) types, including determining a type from a file extension and file contents.

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Package for working with MIME type definitions and for processing streams of MIME multipart media types.

Determining the MIME type for a file #

The MimeTypeResolver class can be used to determine the MIME type of a file. It supports both using the extension of the file name and looking at magic bytes from the beginning of the file.

There is a builtin instance of MimeTypeResolver accessible through the top level function lookupMimeType. This builtin instance has the most common file name extensions and magic bytes registered.

import 'package:mime/mime.dart';

void main() {
  print(lookupMimeType('test.html'));
  // text/html

  print(lookupMimeType('test', headerBytes: [0xFF, 0xD8]));
  // image/jpeg

  print(lookupMimeType('test.html', headerBytes: [0xFF, 0xD8]));
  // image/jpeg
}

You can build you own resolver by creating an instance of MimeTypeResolver and adding file name extensions and magic bytes using addExtension and addMagicNumber.

Processing MIME multipart media types #

The class MimeMultipartTransformer is used to process a Stream of bytes encoded using a MIME multipart media types encoding. The transformer provides a new Stream of MimeMultipart objects each of which have the headers and the content of each part. The content of a part is provided as a stream of bytes.

Below is an example showing how to process an HTTP request and print the length of the content of each part.

// HTTP request with content type multipart/form-data.
HttpRequest request = ...;
// Determine the boundary form the content type header
String boundary = request.headers.contentType.parameters['boundary'];

// Process the body just calculating the length of each part.
request
    .transform(new MimeMultipartTransformer(boundary))
    .map((part) => part.fold(0, (p, d) => p + d))
    .listen((length) => print('Part with length $length'));
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Utilities for handling media (MIME) types, including determining a type from a file extension and file contents.

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