| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library multipart_file; |
| |
| import 'dart:io'; |
| |
| import 'utils.dart'; |
| |
| /// A file to be uploaded as part of a [MultipartRequest]. This doesn't need to |
| /// correspond to a physical file. |
| class MultipartFile { |
| /// The name of the form field for the file. |
| final String field; |
| |
| /// The size of the file in bytes. This must be known in advance, even if this |
| /// file is created from an [InputStream]. |
| final int length; |
| |
| /// The basename of the file. May be null. |
| final String filename; |
| |
| /// The content-type of the file. Defaults to `application/octet-stream`. |
| final ContentType contentType; |
| |
| /// The stream that will emit the file's contents. |
| final InputStream _stream; |
| |
| /// Whether [finalize] has been called. |
| bool get isFinalized => _isFinalized; |
| bool _isFinalized = false; |
| |
| /// Creates a new [MultipartFile] from an [InputStream]. The length of the |
| /// file in bytes must be known in advance. If it's not, read the data from |
| /// the stream and use [MultipartFile.fromBytes] instead. |
| /// |
| /// [contentType] currently defaults to `application/octet-stream`, but in the |
| /// future may be inferred from [filename]. |
| MultipartFile(this.field, this._stream, this.length, |
| {this.filename, ContentType contentType}) |
| : this.contentType = contentType != null ? contentType : |
| new ContentType("application", "octet-stream"); |
| |
| /// Creates a new [MultipartFile] from a byte array. |
| /// |
| /// [contentType] currently defaults to `application/octet-stream`, but in the |
| /// future may be inferred from [filename]. |
| factory MultipartFile.fromBytes(String field, List<int> value, |
| {String filename, ContentType contentType}) { |
| var stream = new ListInputStream(); |
| stream.write(value); |
| stream.markEndOfStream(); |
| return new MultipartFile(field, stream, value.length, |
| filename: filename, |
| contentType: contentType); |
| } |
| |
| /// Creates a new [MultipartFile] from a string. |
| /// |
| /// The encoding to use when translating [value] into bytes is taken from |
| /// [contentType] if it has a charset set. Otherwise, it defaults to UTF-8. |
| /// [contentType] currently defaults to `text/plain; charset=utf-8`, but in |
| /// the future may be inferred from [filename]. |
| factory MultipartFile.fromString(String field, String value, |
| {String filename, ContentType contentType}) { |
| contentType = contentType == null ? new ContentType("text", "plain") : |
| // Make a copy of the original contentType so we can modify charset. |
| new ContentType.fromString(contentType.toString()); |
| var charset = contentType.charset; |
| var encoding = encodingForCharset(contentType.charset, Encoding.UTF_8); |
| contentType.charset = encoding.name; |
| |
| return new MultipartFile.fromBytes(field, encodeString(value, encoding), |
| filename: filename, |
| contentType: contentType); |
| } |
| |
| // TODO(nweiz): Infer the content-type from the filename. |
| /// Creates a new [MultipartFile] from a [File]. |
| /// |
| /// [filename] defaults to the name of the file on disk. [contentType] |
| /// currently defaults to `application/octet-stream`, but in the future may be |
| /// inferred from [filename]. |
| static Future<MultipartFile> fromFile(String field, File file, |
| {String filename, ContentType contentType}) { |
| if (filename == null) filename = new Path(file.name).filename; |
| return file.length().transform((length) { |
| return new MultipartFile(field, file.openInputStream(), length, |
| filename: filename, |
| contentType: contentType); |
| }); |
| } |
| |
| // Finalizes the file in preparation for it being sent as part of a |
| // [MultipartRequest]. This returns an [InputStream] that should emit the body |
| // of the file. The stream may be closed to indicate an empty file. |
| InputStream finalize() { |
| if (isFinalized) { |
| throw new StateError("Can't finalize a finalized MultipartFile."); |
| } |
| _isFinalized = true; |
| return _stream; |
| } |
| } |