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Dart code sample: Simple file server and MIME type library
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| Dart code sample: Simple file server and MIME types library | |
| *** Caution *** | |
| Do not use this code for actual applications. You should use secure connection | |
| and limit access to restricted areas of your file system. | |
| Usage: | |
| 1. Download, uncompress and rename the folder to "FileDownloadServer". | |
| 2. Put files you want to send into the folder. | |
| 3. From Dart Editor, File > Open Folder and select this FileDownloadServer folder. | |
| 4. Run the FileServer.dart as server. | |
| 5. Access the server from your browser: | |
| http://localhost:8080/fserver (Downloading though the download page. Enter the | |
| file_name and click the submit button) | |
| or, http://localhost:8080/fserver/file_name (Direct downloading) | |
| How to specify the file_name: | |
| You can specify the file_name using relative path or absolute path. For example, | |
| let “C:/dart_apps_server/FileDownloadServer” is the folder path of the file | |
| server and the “readme.text” file is placed in the same folder. Then “readme.text” | |
| is equivalent to “C:/dart_apps_server/FileDownloadServer/readme.text”. | |
| Likewise, “test/jpegImage.jpg” is equivalent to | |
| “C:/dart_apps_server/FileDownloadServer/test/jpegImage.jpg”. | |
| Description like “../HelloWorld/HelloWorld.dart” is limited to the download page | |
| and that is equivalent to “C:/dart_apps_server/HelloWorld/HelloWorld.dart”. | |
| In case of downloading HTML files through the download page, browsers will not execute | |
| scripts in the downloaded HTML file. |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Request a File</title> | |
| </head> | |
| <body> | |
| <h1>Request a file</h1> | |
| <h2>Enter the file name to download</h2> | |
| <!-- Modify following lines for your application --> | |
| <form method="get" action="http://localhost:8080/fserver"> | |
| <input type="text" name="fileName" value="readme.txt" size="50"> | |
| <br> | |
| <input type="submit" value=" Submit "> | |
| </form> | |
| </body> | |
| </html> |
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| /* | |
| Dart code sample: Simple file server | |
| 1. Download, uncompress and rename the folder to 'FileDownloadServer'. | |
| 2. Put files you want to send into the folder. | |
| 3. From Dart Editor, File > Open Folder and select this FileDownloadServer folder. | |
| 4. Run the FileServer.dart as server. | |
| 5. Access the server from Chrome: http://localhost:8080/fserver | |
| or directly: http://localhost:8080/fserver/readme.txt | |
| Ref. | |
| https://gist.github.com/2564561 | |
| https://gist.github.com/2564562 | |
| http://www.cresc.co.jp/tech/java/Google_Dart/DartLanguageGuide.pdf (in Japanese) | |
| Modified May 2012, by Terry Mitsuoka. | |
| Revised July 2012 to include MIME library. | |
| Revised Sept. 2012 to incorporate catch syntax change. | |
| Revised Oct. 2012 to incorporate M1 changes. | |
| Revised Feb. 2013 to incorporate newly added dart:async library. | |
| Revised Feb. 2013 to incorporate M3 changes. | |
| March 2013, API changes (String and HttpResponse) fixed | |
| */ | |
| import 'dart:io'; | |
| import 'MIME.dart' as mime; | |
| import "dart:utf" as utf; | |
| import 'dart:async'; | |
| final HOST = '127.0.0.1'; | |
| final PORT = 8080; | |
| final REQUEST_PATH = "/fserver"; | |
| final LOG_REQUESTS = true; | |
| void main() { | |
| HttpServer.bind(HOST, PORT) | |
| .then((HttpServer server) { | |
| server.listen( | |
| (HttpRequest request) { | |
| if (request.uri.path == REQUEST_PATH) { | |
| requestReceivedHandler(request); | |
| } | |
| }); | |
| print("Serving $REQUEST_PATH on http://${HOST}:${PORT}."); | |
| }); | |
| } | |
| void requestReceivedHandler(HttpRequest request) { | |
| HttpResponse response = request.response; | |
| String bodyString = ""; // request body byte data | |
| var completer = new Completer(); | |
| if (request.method == "GET") { completer.complete("query string data received"); | |
| } else if (request.method == "POST") { | |
| request | |
| .transform(new StringDecoder()) | |
| .listen( | |
| (String str){bodyString = bodyString + str;}, | |
| onDone: (){ | |
| completer.complete("body data received");}, | |
| onError: (e){ | |
| print('exeption occured : ${e.toString()}');} | |
| ); | |
| } | |
| else { | |
| response.statusCode = HttpStatus.METHOD_NOT_ALLOWED; | |
| response.close(); | |
| return; | |
| } | |
| // process the request | |
| completer.future.then((data){ | |
| if (LOG_REQUESTS) { | |
| print(createLogMessage(request, bodyString)); | |
| } | |
| if (request.queryParameters['fileName'] != null) { | |
| new FileHandler().onRequest(request, response); | |
| } else | |
| { | |
| String fName = request.uri.path.replaceFirst(REQUEST_PATH, ''); | |
| if (fName.length > 2) { | |
| fName = fName.substring(1); | |
| new FileHandler().onRequest(request, response, fName); | |
| } | |
| else { new FileHandler().onRequest(request, response, 'Client.html'); | |
| } | |
| } | |
| }); | |
| } | |
| class FileHandler { | |
| FileHandler(){ | |
| } | |
| void onRequest(HttpRequest request, HttpResponse response, [String fileName = null]) { | |
| try { | |
| if (fileName == null) { | |
| fileName = request.queryParameters['fileName']; | |
| } | |
| if (LOG_REQUESTS) { | |
| print('Requested file name : $fileName'); | |
| } | |
| File file = new File(fileName); | |
| if (file.existsSync()) { | |
| String mimeType = 'text/html; charset=UTF-8'; | |
| int lastDot = fileName.lastIndexOf('.', fileName.length - 1); | |
| if (lastDot != -1) { | |
| String extension = fileName.substring(lastDot + 1); | |
| mimeType = mime.mimeType(extension); | |
| } | |
| response.headers.set('Content-Type', mimeType); | |
| // response.headers.set('Content-Disposition', 'attachment; filename=\'${fileName}\''); | |
| // Get the length of the file for setting the Content-Length header. | |
| RandomAccessFile openedFile = file.openSync(); | |
| response.contentLength = openedFile.lengthSync(); | |
| openedFile.closeSync(); | |
| // Pipe the file content into the response. | |
| file.openRead().pipe(response); | |
| } else { | |
| if (LOG_REQUESTS) { | |
| print('File not found: $fileName'); | |
| } | |
| new NotFoundHandler().onRequest(request, response); | |
| } | |
| } on Exception catch (err) { | |
| print('File Handler error : $err.toString()'); | |
| } | |
| } | |
| } | |
| class NotFoundHandler { | |
| NotFoundHandler(){ | |
| } | |
| static final String notFoundPageHtml = ''' | |
| <html><head> | |
| <title>404 Not Found</title> | |
| </head><body> | |
| <h1>Not Found</h1> | |
| <p>The requested URL or File was not found on this server.</p> | |
| </body></html>'''; | |
| void onRequest(HttpRequest request, HttpResponse response){ | |
| response | |
| ..statusCode = HttpStatus.NOT_FOUND | |
| ..headers.set('Content-Type', 'text/html; charset=UTF-8') | |
| ..write(notFoundPageHtml) | |
| ..close(); | |
| } | |
| } | |
| // create log message | |
| StringBuffer createLogMessage(HttpRequest request, [String bodyString]) { | |
| var sb = new StringBuffer( '''request.headers.host : ${request.headers.host} | |
| request.headers.port : ${request.headers.port} | |
| request.connectionInfo.localPort : ${request.connectionInfo.localPort} | |
| request.connectionInfo.remoteHost : ${request.connectionInfo.remoteHost} | |
| request.connectionInfo.remotePort : ${request.connectionInfo.remotePort} | |
| request.method : ${request.method} | |
| request.persistentConnection : ${request.persistentConnection} | |
| request.protocolVersion : ${request.protocolVersion} | |
| request.contentLength : ${request.contentLength} | |
| request.uri : ${request.uri} | |
| request.uri.path : ${request.uri.path} | |
| request.uri.query : ${request.uri.query} | |
| request.uri.queryParameters : | |
| '''); | |
| request.queryParameters.forEach((key, value){ | |
| sb.write(" ${key} : ${value}\n"); | |
| }); | |
| sb.write('''request.cookies : | |
| '''); | |
| request.cookies.forEach((value){ | |
| sb.write(" ${value.toString()}\n"); | |
| }); | |
| sb.write('''request.headers.expires : ${request.headers.expires} | |
| request.headers : | |
| '''); | |
| var str = request.headers.toString(); | |
| for (int i = 0; i < str.length - 1; i++){ | |
| if (str[i] == "\n") { sb.write("\n "); | |
| } else { sb.write(str[i]); | |
| } | |
| } | |
| sb.write('''\nrequest.session.id : ${request.session.id} | |
| requset.session.isNew : ${request.session.isNew} | |
| '''); | |
| if (request.method == "POST") { | |
| var enctype = request.headers["content-type"]; | |
| if (enctype[0].contains("text")) { | |
| sb.write("request body string : ${bodyString.replaceAll('+', ' ')}"); | |
| } else if (enctype[0].contains("urlencoded")) { | |
| sb.write("request body string (URL decoded): ${urlDecode(bodyString)}"); | |
| } | |
| } | |
| sb.write("\n"); | |
| return sb; | |
| } | |
| // make safe string buffer data as HTML text | |
| StringBuffer makeSafe(StringBuffer b) { | |
| var s = b.toString(); | |
| b = new StringBuffer(); | |
| for (int i = 0; i < s.length; i++){ | |
| if (s[i] == '&') { b.write('&'); | |
| } else if (s[i] == '"') { b.write('"'); | |
| } else if (s[i] == "'") { b.write('''); | |
| } else if (s[i] == '<') { b.write('<'); | |
| } else if (s[i] == '>') { b.write('>'); | |
| } else { b.write(s[i]); | |
| } | |
| } | |
| return b; | |
| } | |
| // URL decoder decodes url encoded utf-8 bytes | |
| // Use this method to decode query string | |
| // We need this kind of encoder and decoder with optional [encType] argument | |
| String urlDecode(String s){ | |
| int i, p, q; | |
| var ol = new List<int>(); | |
| for (i = 0; i < s.length; i++) { | |
| if (s[i].codeUnitAt(0) == 0x2b) { ol.add(0x20); // convert + to space | |
| } else if (s[i].codeUnitAt(0) == 0x25) { // convert hex bytes to a single bite | |
| i++; | |
| p = s[i].toUpperCase().codeUnitAt(0) - 0x30; | |
| if (p > 9) p = p - 7; | |
| i++; | |
| q = s[i].toUpperCase().codeUnitAt(0) - 0x30; | |
| if (q > 9) q = q - 7; | |
| ol.add(p * 16 + q); | |
| } | |
| else { ol.add(s[i].codeUnitAt(0)); | |
| } | |
| } | |
| return utf.decodeUtf8(ol); | |
| } |
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| library MIME; | |
| // get MIME type (returns null if there is no such extension) | |
| String mimeType(String extension) => _mimeMaps[extension]; | |
| // default MIME type mappings | |
| Map _mimeMaps = const { | |
| 'abs': 'audio/x-mpeg', | |
| 'ai': 'application/postscript', | |
| 'aif': 'audio/x-aiff', | |
| 'aifc': 'audio/x-aiff', | |
| 'aiff': 'audio/x-aiff', | |
| 'aim': 'application/x-aim', | |
| 'art': 'image/x-jg', | |
| 'asf': 'video/x-ms-asf', | |
| 'asx': 'video/x-ms-asf', | |
| 'au': 'audio/basic', | |
| 'avi': 'video/x-msvideo', | |
| 'avx': 'video/x-rad-screenplay', | |
| 'bcpio': 'application/x-bcpio', | |
| 'bin': 'application/octet-stream', | |
| 'bmp': 'image/bmp', | |
| 'body': 'text/html', | |
| 'cdf': 'application/x-cdf', | |
| 'cer': 'application/x-x509-ca-cert', | |
| 'class': 'application/java', | |
| 'cpio': 'application/x-cpio', | |
| 'csh': 'application/x-csh', | |
| 'css': 'text/css', | |
| 'dart': 'application/vnd.dart', | |
| 'dib': 'image/bmp', | |
| 'doc': 'application/msword', | |
| 'docm': 'application/vnd.ms-word.document.macroEnabled.12', | |
| 'docx': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', | |
| 'dot': 'application/msword', | |
| 'dotm': 'application/vnd.ms-word.template.macroEnabled.12', | |
| 'dotx': 'application/vnd.openxmlformats-officedocument.wordprocessingml.template', | |
| 'dtd': 'application/xml-dtd', | |
| 'dv': 'video/x-dv', | |
| 'dvi': 'application/x-dvi', | |
| 'eps': 'application/postscript', | |
| 'etx': 'text/x-setext', | |
| 'exe': 'application/octet-stream', | |
| 'gif': 'image/gif', | |
| 'gtar': 'application/x-gtar', | |
| 'gz': 'application/x-gzip', | |
| 'hdf': 'application/x-hdf', | |
| 'hqx': 'application/mac-binhex40', | |
| 'htc': 'text/x-component', | |
| 'htm': 'text/html', | |
| 'html': 'text/html', | |
| 'ico': 'image/vnd.microsoft.icon', | |
| 'ief': 'image/ief', | |
| 'jad': 'text/vnd.sun.j2me.app-descriptor', | |
| 'jar': 'application/java-archive', | |
| 'java': 'text/plain', | |
| 'jnlp': 'application/x-java-jnlp-file', | |
| 'jpe': 'image/jpeg', | |
| 'jpeg': 'image/jpeg', | |
| 'jpg': 'image/jpeg', | |
| 'js': 'text/javascript', | |
| 'jsf': 'text/plain', | |
| 'jspf': 'text/plain', | |
| 'kar': 'audio/x-midi', | |
| 'latex': 'application/x-latex', | |
| 'm3u': 'audio/x-mpegurl', | |
| 'mac': 'image/x-macpaint', | |
| 'man': 'application/x-troff-man', | |
| 'mathml': 'application/mathml+xml', | |
| 'me': 'application/x-troff-me', | |
| 'mid': 'audio/x-midi', | |
| 'midi': 'audio/x-midi', | |
| 'mif': 'application/x-mif', | |
| 'mov': 'video/quicktime', | |
| 'movie': 'video/x-sgi-movie', | |
| 'mp1': 'audio/x-mpeg', | |
| 'mp2': 'audio/x-mpeg', | |
| 'mp3': 'audio/x-mpeg', | |
| 'mp4': 'video/mp4', | |
| 'mpa': 'audio/x-mpeg', | |
| 'mpe': 'video/mpeg', | |
| 'mpeg': 'video/mpeg', | |
| 'mpega': 'audio/x-mpeg', | |
| 'mpg': 'video/mpeg', | |
| 'mpv2': 'video/mpeg2', | |
| 'ms': 'application/x-wais-source', | |
| 'nc': 'application/x-netcdf', | |
| 'oda': 'application/oda', | |
| 'odb': 'application/vnd.oasis.opendocument.database', | |
| 'odc': 'application/vnd.oasis.opendocument.chart', | |
| 'odf': 'application/vnd.oasis.opendocument.formula', | |
| 'odg': 'application/vnd.oasis.opendocument.graphics', | |
| 'odi': 'application/vnd.oasis.opendocument.image', | |
| 'odm': 'application/vnd.oasis.opendocument.text-master', | |
| 'odp': 'application/vnd.oasis.opendocument.presentation', | |
| 'ods': 'application/vnd.oasis.opendocument.spreadsheet', | |
| 'odt': 'application/vnd.oasis.opendocument.text', | |
| 'otg': 'application/vnd.oasis.opendocument.graphics-template', | |
| 'oth': 'application/vnd.oasis.opendocument.text-web', | |
| 'otp': 'application/vnd.oasis.opendocument.presentation-template', | |
| 'ots': 'application/vnd.oasis.opendocument.spreadsheet-template', | |
| 'ott': 'application/vnd.oasis.opendocument.text-template', | |
| 'ogx': 'application/ogg', | |
| 'ogv': 'video/ogg', | |
| 'oga': 'audio/ogg', | |
| 'ogg': 'audio/ogg', | |
| 'spx': 'audio/ogg', | |
| 'flac': 'audio/flac', | |
| 'anx': 'application/annodex', | |
| 'axa': 'audio/annodex', | |
| 'axv': 'video/annodex', | |
| 'xspf': 'application/xspf+xml', | |
| 'pbm': 'image/x-portable-bitmap', | |
| 'pct': 'image/pict', | |
| 'pdf': 'application/pdf', | |
| 'pgm': 'image/x-portable-graymap', | |
| 'pic': 'image/pict', | |
| 'pict': 'image/pict', | |
| 'pls': 'audio/x-scpls', | |
| 'png': 'image/png', | |
| 'pnm': 'image/x-portable-anymap', | |
| 'pnt': 'image/x-macpaint', | |
| 'ppm': 'image/x-portable-pixmap', | |
| 'ppt': 'application/vnd.ms-powerpoint', | |
| 'pot': 'application/vnd.ms-powerpoint', | |
| 'pps': 'application/vnd.ms-powerpoint', | |
| 'ppa': 'application/vnd.ms-powerpoint', | |
| 'pptx': 'application/vnd.openxmlformats-officedocument.presentationml.presentation', | |
| 'potx': 'application/vnd.openxmlformats-officedocument.presentationml.template', | |
| 'ppsx': 'application/vnd.openxmlformats-officedocument.presentationml.slideshow', | |
| 'ppam': 'application/vnd.ms-powerpoint.addin.macroEnabled.12', | |
| 'pptm': 'application/vnd.ms-powerpoint.presentation.macroEnabled.12', | |
| 'potm': 'application/vnd.ms-powerpoint.template.macroEnabled.12', | |
| 'ppsm': 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12', | |
| 'ps': 'application/postscript', | |
| 'psd': 'image/x-photoshop', | |
| 'qt': 'video/quicktime', | |
| 'qti': 'image/x-quicktime', | |
| 'qtif': 'image/x-quicktime', | |
| 'ras': 'image/x-cmu-raster', | |
| 'rdf': 'application/rdf+xml', | |
| 'rgb': 'image/x-rgb', | |
| 'rm': 'application/vnd.rn-realmedia', | |
| 'roff': 'application/x-troff', | |
| 'rtf': 'application/rtf', | |
| 'rtx': 'text/richtext', | |
| 'sh': 'application/x-sh', | |
| 'shar': 'application/x-shar', | |
| // 'shtml': 'text/x-server-parsed-html', | |
| 'smf': 'audio/x-midi', | |
| 'sit': 'application/x-stuffit', | |
| 'snd': 'audio/basic', | |
| 'src': 'application/x-wais-source', | |
| 'sv4cpio': 'application/x-sv4cpio', | |
| 'sv4crc': 'application/x-sv4crc', | |
| 'svg': 'image/svg+xml', | |
| 'svgz': 'image/svg+xml', | |
| 'swf': 'application/x-shockwave-flash', | |
| 't': 'application/x-troff', | |
| 'tar': 'application/x-tar', | |
| 'tcl': 'application/x-tcl', | |
| 'tex': 'application/x-tex', | |
| 'texi': 'application/x-texinfo', | |
| 'texinfo': 'application/x-texinfo', | |
| 'tif': 'image/tiff', | |
| 'tiff': 'image/tiff', | |
| 'tr': 'application/x-troff', | |
| 'tsv': 'text/tab-separated-values', | |
| 'txt': 'text/plain', | |
| 'ulw': 'audio/basic', | |
| 'ustar': 'application/x-ustar', | |
| 'vxml': 'application/voicexml+xml', | |
| 'xbm': 'image/x-xbitmap', | |
| 'xht': 'application/xhtml+xml', | |
| 'xhtml': 'application/xhtml+xml', | |
| 'xls': 'application/vnd.ms-excel', | |
| 'xlt': 'application/vnd.ms-excel', | |
| 'xla': 'application/vnd.ms-excel', | |
| 'xlsx': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', | |
| 'xltx': 'application/vnd.openxmlformats-officedocument.spreadsheetml.template', | |
| 'xlsm': 'application/vnd.ms-excel.sheet.macroEnabled.12', | |
| 'xltm': 'application/vnd.ms-excel.template.macroEnabled.12', | |
| 'xlam': 'application/vnd.ms-excel.addin.macroEnabled.12', | |
| 'xlsb': 'application/vnd.ms-excel.sheet.binary.macroEnabled.12', | |
| 'xml': 'application/xml', | |
| 'xpm': 'image/x-xpixmap', | |
| 'xsl': 'application/xml', | |
| 'xslt': 'application/xslt+xml', | |
| 'xul': 'application/vnd.mozilla.xul+xml', | |
| 'xwd': 'image/x-xwindowdump', | |
| 'vsd': 'application/x-visio', | |
| 'war': 'application/java-archive', | |
| 'wav': 'audio/x-wav', | |
| 'wbmp': 'image/vnd.wap.wbmp', | |
| 'wml': 'text/vnd.wap.wml', | |
| 'wmlc': 'application/vnd.wap.wmlc', | |
| 'wmls': 'text/vnd.wap.wmlscript', | |
| 'wmlscriptc': 'application/vnd.wap.wmlscriptc', | |
| 'wmv': 'video/x-ms-wmv', | |
| 'wrl': 'x-world/x-vrml', | |
| 'wspolicy': 'application/wspolicy+xml', | |
| 'Z': 'application/x-compress', | |
| 'z': 'application/x-compress', | |
| 'zip': 'application/zip' | |
| }; |
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