Feature/improve file extensions

analysis_options.yaml

@@ -9,6 +9,8 @@ analyzer:
     unused_local_variable: warning
     dead_code: warning
     invalid_override_of_non_virtual_member: error
+  enable-experiment:
+    - extension-methods
 
 linter:
   rules:

lib/flutter_cache_manager.dart

@@ -1,4 +1,4 @@
 export 'src/cache_manager.dart';
-export 'src/file_fetcher.dart';
 export 'src/file_info.dart';
-export 'src/web_helper.dart' show HttpExceptionWithStatus;
+export 'src/web/file_fetcher.dart';
+export 'src/web/web_helper.dart' show HttpExceptionWithStatus;

lib/src/cache_manager.dart

@@ -4,11 +4,12 @@ import 'dart:typed_data';
 
 import 'package:file/file.dart' as f;
 import 'package:file/local.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_cache_manager/src/storage/cache_object.dart';
 import 'package:flutter_cache_manager/src/cache_store.dart';
-import 'package:flutter_cache_manager/src/file_fetcher.dart';
+import 'package:flutter_cache_manager/src/web/file_fetcher.dart';
 import 'package:flutter_cache_manager/src/file_info.dart';
-import 'package:flutter_cache_manager/src/web_helper.dart';
+import 'package:flutter_cache_manager/src/web/web_helper.dart';
 import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart';
 import 'package:pedantic/pedantic.dart';

lib/src/file_fetcher.dart → lib/src/web/file_fetcher.dart

@@ -1,7 +1,8 @@
 import 'dart:async';
+import 'dart:io';
 import 'package:clock/clock.dart';
-import 'package:flutter_cache_manager/src/web_helper.dart';
 import 'package:http/http.dart' as http;
+import 'mime_converter.dart';
 
 ///Flutter Cache Manager
 ///Copyright (c) 2019 Rene Floor
@@ -19,7 +20,7 @@ abstract class FileService {
 /// [WebHelper]. One can easily adapt it to use dio or any other http client.
 class HttpFileFetcher implements FileService {
   http.Client _httpClient;
-  HttpFileFetcher({http.Client httpClient}){
+  HttpFileFetcher({http.Client httpClient}) {
     _httpClient = httpClient ?? http.Client();
   }
 
@@ -37,13 +38,17 @@ class HttpFileFetcher implements FileService {
 /// Defines the interface for a get result of a [FileService].
 abstract class FileFetcherResponse {
   /// [content] is a stream of bytes
-  Stream<List<int>> get content => null;
+  Stream<List<int>> get content;
+
   /// [statusCode] is expected to conform to an http status code.
   int get statusCode;
+
   /// Defines till when the cache should be assumed to be valid.
   DateTime get validTill;
+
   /// [eTag] is used when asking to update the cache
   String get eTag;
+
   /// Used to save the file on the storage, includes a dot. For example '.jpeg'
   String get fileExtension;
 }
@@ -100,10 +105,8 @@ class HttpFileFetcherResponse implements FileFetcherResponse {
   String get fileExtension {
     var fileExtension = '';
     if (_hasHeader('content-type')) {
-      final type = _header('content-type').split('/');
-      if (type.length == 2) {
-        fileExtension = '.${type[1]}';
-      }
+      var contentType = ContentType.parse(_header('content-type'));
+      fileExtension = contentType.fileExtension ?? '';
     }
     return fileExtension;
   }

lib/src/web/mime_converter.dart

@@ -0,0 +1,90 @@
+import 'dart:io';
+
+///Converts the most common MIME types to the most expected file extension.
+extension ContentTypeConverter on ContentType {
+  String get fileExtension {
+    if (this == null) return null;
+    if (mimeTypes.containsKey(toString())) return mimeTypes[toString()];
+    return '.$subType';
+  }
+}
+
+/// Source of MIME Types:
+/// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
+/// Updated on 20th of March in 2020 while being quarantined
+const mimeTypes = {
+  'application/epub+zip': '.epub',
+  'application/gzip': '.gz',
+  'application/java-archive': '.jar',
+  'application/json': '.json',
+  'application/ld+json': '.jsonld',
+  'application/msword': '.doc',
+  'application/octet-stream': '.bin',
+  'application/ogg': '.ogx',
+  'application/pdf': '.pdf',
+  'application/php': '.php',
+  'application/rtf': '.rtf',
+  'application/vnd.amazon.ebook': '.azw',
+  'application/vnd.apple.installer+xml': '.mpkg',
+  'application/vnd.mozilla.xul+xml': '.xul',
+  'application/vnd.ms-excel': '.xls',
+  'application/vnd.ms-fontobject': '.eot',
+  'application/vnd.ms-powerpoint': '.ppt',
+  'application/vnd.oasis.opendocument.presentation': '.odp',
+  'application/vnd.oasis.opendocument.spreadsheet': '.ods',
+  'application/vnd.oasis.opendocument.text': '.odt',
+  'application/vnd.openxmlformats-officedocument.presentationml.presentation':
+      '.pptx',
+  'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet': '.xlsx',
+  'application/vnd.openxmlformats-officedocument.wordprocessingml.document':
+      '.docx',
+  'application/vnd.rar': '.rar',
+  'application/vnd.visio': '.vsd',
+  'application/x-7z-compressed': '.7z',
+  'application/x-abiword': '.abw',
+  'application/x-bzip': '.bz',
+  'application/x-bzip2': '.bz2',
+  'application/x-csh': '.csh',
+  'application/x-freearc': '.arc',
+  'application/x-sh': '.sh',
+  'application/x-shockwave-flash': '.swf',
+  'application/x-tar': '.tar',
+  'application/xhtml+xml': '.xhtml',
+  'application/xml': '.xml',
+  'application/zip': '.zip',
+  'audio/3gpp': '.3gp',
+  'audio/3gpp2': '.3g2',
+  'audio/aac': '.aac',
+  'audio/midi audio/x-midi': '.midi',
+  'audio/mpeg': '.mp3',
+  'audio/ogg': '.oga',
+  'audio/opus': '.opus',
+  'audio/wav': '.wav',
+  'audio/webm': '.weba',
+  'font/otf': '.otf',
+  'font/ttf': '.ttf',
+  'font/woff': '.woff',
+  'font/woff2': '.woff2',
+  'image/bmp': '.bmp',
+  'image/gif': '.gif',
+  'image/jpeg': '.jpg',
+  'image/png': '.png',
+  'image/svg+xml': '.svg',
+  'image/tiff': '.tiff',
+  'image/vnd.microsoft.icon': '.ico',
+  'image/webp': '.webp',
+  'text/calendar': '.ics',
+  'text/css': '.css',
+  'text/csv': '.csv',
+  'text/html': '.html',
+  'text/javascript': '.js',
+  'text/plain': '.txt',
+  'text/xml': '.xml',
+  'video/3gpp': '.3gp',
+  'video/3gpp2': '.3g2',
+  'video/mp2t': '.ts',
+  'video/mpeg': '.mpeg',
+  'video/ogg': '.ogv',
+  'video/webm': '.webm',
+  'video/x-msvideo': '.avi'
+};

lib/src/web_helper.dart → lib/src/web/web_helper.dart

@@ -3,7 +3,7 @@ import 'dart:io';
 
 import 'package:flutter_cache_manager/src/storage/cache_object.dart';
 import 'package:flutter_cache_manager/src/cache_store.dart';
-import 'package:flutter_cache_manager/src/file_fetcher.dart';
+import 'package:flutter_cache_manager/src/web/file_fetcher.dart';
 import 'package:flutter_cache_manager/src/file_info.dart';
 import 'package:pedantic/pedantic.dart';
 import 'package:uuid/uuid.dart';

pubspec.yaml

@@ -5,7 +5,7 @@ author: Rene Floor <pub@renefloor.nl>
 homepage: https://github.com/renefloor/flutter_cache_manager
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: ">=2.6.0 <3.0.0"
 
 dependencies:
   flutter:

test/http_file_fetcher_test.dart

@@ -10,8 +10,8 @@ void main() {
   group('Check header values', () {
     test('Valid headers should be parsed normally', () async {
       var eTag = 'test';
-      var fileExtension = 'jpeg';
-      var contentType = 'image/$fileExtension';
+      var fileExtension = 'jpg';
+      var contentType = 'image/jpeg';
       var maxAge = const Duration(hours: 2);
 
       var client = MockClient((request) async {