#!/usr/bin/env python3 # Portions Copyright (C) 2009,2010 Xyne # Portions Copyright (C) 2011 Sean Goller # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # (version 2) as published by the Free Software Foundation. # # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. """Range HTTP Server. This module builds on BaseHTTPServer by implementing the standard GET and HEAD requests in a fairly straightforward manner, and includes support for the Range header. """ __version__ = "0.1" __all__ = ["RangeHTTPRequestHandler"] import os import sys from socketserver import ThreadingMixIn import posixpath import http.server import urllib.parse import html import shutil import mimetypes import io import time _bandwidth = 0 class ThreadingSimpleServer(ThreadingMixIn, http.server.HTTPServer): pass class RangeHTTPRequestHandler(http.server.BaseHTTPRequestHandler): """Simple HTTP request handler with GET and HEAD commands. This serves files from the current directory and any of its subdirectories. The MIME type for files is determined by calling the .guess_type() method. The GET and HEAD requests are identical except that the HEAD request omits the actual contents of the file. """ server_version = "RangeHTTP/" + __version__ def do_GET(self): """Serve a GET request.""" f, start_range, end_range = self.send_head() print("Got values of {} and {}".format(start_range, end_range)) if f: f.seek(start_range, 0) chunk = 0x1000 total = 0 while chunk > 0: if start_range + chunk > end_range: chunk = end_range - start_range if _bandwidth != 0: time_to_sleep = float(float(chunk) / float(_bandwidth)) time.sleep(time_to_sleep) try: self.wfile.write(f.read(chunk)) except Exception: break total += chunk start_range += chunk f.close() def do_HEAD(self): """Serve a HEAD request.""" f, start_range, end_range = self.send_head() if f: f.close() def send_head(self): """Common code for GET and HEAD commands. This sends the response code and MIME headers. Return value is either a file object (which has to be copied to the outputfile by the caller unless the command was HEAD, and must be closed by the caller under all circumstances), or None, in which case the caller has nothing further to do. """ path = self.translate_path(self.path) f = None if os.path.isdir(path): if not self.path.endswith("/"): # redirect browser self.send_response(301) self.send_header("Location", self.path + "/") self.end_headers() return (None, 0, 0) for index in "index.html", "index.html": index = os.path.join(path, index) if os.path.exists(index): path = index break else: return self.list_directory(path) ctype = self.guess_type(path) try: # Always read in binary mode. Opening files in text mode may cause # newline translations, making the actual size of the content # transmitted *less* than the content-length! f = open(path, "rb") except IOError: self.send_error(404, "File not found") return (None, 0, 0) if "Range" in self.headers: self.send_response(206) # partial content response else: self.send_response(200) self.send_header("Content-type", ctype) file_size = os.path.getsize(path) start_range = 0 end_range = file_size self.send_header("Accept-Ranges", "bytes") if "Range" in self.headers: s, e = self.headers['range'][6:].split('-', 1) # bytes:%d-%d sl = len(s) el = len(e) if sl: start_range = int(s) if el: end_range = int(e) + 1 elif el: start_range = file_size - min(file_size, int(e)) self.send_header("Content-Range", "bytes {}-{}/{}".format(start_range, end_range, file_size)) self.send_header("Content-Length", end_range - start_range) self.end_headers() print("Sending bytes {} to {}...".format(start_range, end_range)) return (f, start_range, end_range) def list_directory(self, path): """Helper to produce a directory listing (absent index.html). Return value is either a file object, or None (indicating an error). In either case, the headers are sent, making the interface the same as for send_head(). """ try: lst = os.listdir(path) except OSError: self.send_error(404, "Access Forbidden") return None lst.sort(key=lambda file_name: file_name.lower()) html_text = [] displaypath = html.escape(urllib.parse.unquote(self.path)) html_text.append('') html_text.append("\nDirectory listing for {}\n".format(displaypath)) html_text.append("\n

Directory listing for {}

\n".format(displaypath)) html_text.append("
\n\n\n\n\n') byte_encoded_string = "\n".join(html_text).encode("utf-8", "surrogateescape") f = io.BytesIO() f.write(byte_encoded_string) length = len(byte_encoded_string) f.seek(0) self.send_response(200) self.send_header("Content-type", "text/html") self.send_header("Content-length", str(length)) self.end_headers() return (f, 0, length) def translate_path(self, path): """Translate a /-separated PATH to the local filename syntax. Components that mean special things to the local file system (e.g. drive or directory names) are ignored. (XXX They should probably be diagnosed.) """ # abandon query parameters path = path.split("?", 1)[0] path = path.split("#", 1)[0] path = posixpath.normpath(urllib.parse.unquote(path)) words = path.split("/") words = filter(None, words) path = os.getcwd() for word in words: drive, word = os.path.splitdrive(word) head, word = os.path.split(word) if word in (os.curdir, os.pardir): continue path = os.path.join(path, word) return path def guess_type(self, path): """Guess the type of a file. Argument is a PATH (a filename). Return value is a string of the form type/subtype, usable for a MIME Content-type header. The default implementation looks the file's extension up in the table self.extensions_map, using application/octet-stream as a default; however it would be permissible (if slow) to look inside the data to make a better guess. """ base, ext = posixpath.splitext(path) if ext in self.extension_map: return self.extension_map[ext] ext = ext.lower() if ext in self.extension_map: return self.extension_map[ext] else: return self.extension_map[''] if not mimetypes.inited: mimetypes.init() extension_map = mimetypes.types_map.copy() extension_map.update({ '': 'application/octet-stream', # Default '.py': 'text/plain', '.c': 'text/plain', '.h': 'text/plain', '.mp4': 'video/mp4', '.ogg': 'video/ogg', '.java': 'text/plain', }) def test(handler_class=RangeHTTPRequestHandler, server_class=http.server.HTTPServer): http.server.test(handler_class, server_class) if __name__ == "__main__": httpd = ThreadingSimpleServer(("0.0.0.0", int(sys.argv[1])), RangeHTTPRequestHandler) httpd.serve_forever()