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Also update CHANGELOG after last change. R=kustermann@google.com, wibling@google.com BUG=http://dartbug.com/22442 Review URL: https://codereview.chromium.org//936733004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43841 260f80e4-7a28-3924-810f-c04153c831b5 |
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README.md |
#MIME type package
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 begining 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.
print(lookupMimeType('test.html')); // Will print text/html
print(lookupMimeType('test', [0xFF, 0xD8])); // Will print image/jpeg
print(lookupMimeType('test.html', [0xFF, 0xD8])); // Will print 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'));
Take a look at the HttpBodyHandler
in the http_server package for
handling different content types in a HTTP request.