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GeezerVison is showing github.com — cpython/Lib/http/server.py at 3.15 · python/cpython Expand file tree/ Copy pathserver.pyMore file actions 1177 lines (983 loc) · 43.1 KB / Copy pathserver.pyFile metadata and controls1177 lines (983 loc) · 43.1 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 """HTTP server classes. Note: BaseHTTPRequestHandler doesn't implement any HTTP request; see SimpleHTTPRequestHandler for simple implementations of GET, HEAD and POST. It does, however, optionally implement HTTP/1.1 persistent connections. XXX To do: - log requests even later (to capture byte count) - log user-agent header and other interesting goodies - send error log to separate file """ # See also: # # HTTP Working Group T. Berners-Lee # INTERNET-DRAFT R. T. Fielding # <draft-ietf-http-v10-spec-00.txt> H. Frystyk Nielsen # Expires September 8, 1995 March 8, 1995 # # URL: http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-v10-spec-00.txt # # and # # Network Working Group R. Fielding # Request for Comments: 2616 et al # Obsoletes: 2068 June 1999 # Category: Standards Track # # URL: http://www.faqs.org/rfcs/rfc2616.html # Log files # --------- # # Here's a quote from the NCSA httpd docs about log file format. # # | The logfile format is as follows. Each line consists of: # | # | host rfc931 authuser [DD/Mon/YYYY:hh:mm:ss] "request" ddd bbbb # | # | host: Either the DNS name or the IP number of the remote client # | rfc931: Any information returned by identd for this person, # | - otherwise. # | authuser: If user sent a userid for authentication, the user name, # | - otherwise. # | DD: Day # | Mon: Month (calendar name) # | YYYY: Year # | hh: hour (24-hour format, the machine's timezone) # | mm: minutes # | ss: seconds # | request: The first line of the HTTP request as sent by the client. # | ddd: the status code returned by the server, - if not available. # | bbbb: the total number of bytes sent, # | *not including the HTTP/1.0 header*, - if not available # | # | You can determine the name of the file accessed through request. # # (Actually, the latter is only true if you know the server configuration # at the time the request was made!) __all__ = [ "HTTPServer", "ThreadingHTTPServer", "HTTPSServer", "ThreadingHTTPSServer", "BaseHTTPRequestHandler", "SimpleHTTPRequestHandler", ] import datetime import email.utils import html import http.client import io import itertools import mimetypes import os import posixpath import shutil import socket import socketserver import sys import time import urllib.parse from http import HTTPStatus lazy import _colorize # Default error message template DEFAULT_ERROR_MESSAGE = """\ <!DOCTYPE HTML> <html lang="en"> <head> <meta charset="utf-8"> <style type="text/css"> :root { color-scheme: light dark; } </style> <title>Error response</title> </head> <body> <h1>Error response</h1> <p>Error code: %(code)d</p> <p>Message: %(message)s.</p> <p>Error code explanation: %(code)s - %(explain)s.</p> </body> </html> """ DEFAULT_ERROR_CONTENT_TYPE = "text/html;charset=utf-8" class HTTPServer(socketserver.TCPServer): allow_reuse_address = True # Seems to make sense in testing environment allow_reuse_port = False def server_bind(self): """Override server_bind to store the server name.""" socketserver.TCPServer.server_bind(self) host, port = self.server_address[:2] self.server_name = socket.getfqdn(host) self.server_port = port class ThreadingHTTPServer(socketserver.ThreadingMixIn, HTTPServer): daemon_threads = True class HTTPSServer(HTTPServer): def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True, *, certfile, keyfile=None, password=None, alpn_protocols=None): try: import ssl except ImportError: raise RuntimeError("SSL module is missing; " "HTTPS support is unavailable") self.ssl = ssl self.certfile = certfile self.keyfile = keyfile self.password = password # Support by default HTTP/1.1 self.alpn_protocols = ( ["http/1.1"] if alpn_protocols is None else alpn_protocols ) super().__init__(server_address, RequestHandlerClass, bind_and_activate) def server_activate(self): """Wrap the socket in SSLSocket.""" super().server_activate() context = self._create_context() self.socket = context.wrap_socket(self.socket, server_side=True) def _create_context(self): """Create a secure SSL context.""" context = self.ssl.create_default_context(self.ssl.Purpose.CLIENT_AUTH) context.load_cert_chain(self.certfile, self.keyfile, self.password) context.set_alpn_protocols(self.alpn_protocols) return context class ThreadingHTTPSServer(socketserver.ThreadingMixIn, HTTPSServer): daemon_threads = True class BaseHTTPRequestHandler(socketserver.StreamRequestHandler): """HTTP request handler base class. The following explanation of HTTP serves to guide you through the code as well as to expose any misunderstandings I may have about HTTP (so you don't need to read the code to figure out I'm wrong :-). HTTP (HyperText Transfer Protocol) is an extensible protocol on top of a reliable stream transport (e.g. TCP/IP). The protocol recognizes three parts to a request: 1. One line identifying the request type and path 2. An optional set of RFC-822-style headers 3. An optional data part The headers and data are separated by a blank line. The first line of the request has the form <command> <path> <version> where <command> is a (case-sensitive) keyword such as GET or POST, <path> is a string containing path information for the request, and <version> should be the string "HTTP/1.0" or "HTTP/1.1". <path> is encoded using the URL encoding scheme (using %xx to signify the ASCII character with hex code xx). The specification specifies that lines are separated by CRLF but for compatibility with the widest range of clients recommends servers also handle LF. Similarly, whitespace in the request line is treated sensibly (allowing multiple spaces between components and allowing trailing whitespace). Similarly, for output, lines ought to be separated by CRLF pairs but most clients grok LF characters just fine. If the first line of the request has the form <command> <path> (i.e. <version> is left out) then this is assumed to be an HTTP 0.9 request; this form has no optional headers and data part and the reply consists of just the data. The reply form of the HTTP 1.x protocol again has three parts: 1. One line giving the response code 2. An optional set of RFC-822-style headers 3. The data Again, the headers and data are separated by a blank line. The response code line has the form <version> <responsecode> <responsestring> where <version> is the protocol version ("HTTP/1.0" or "HTTP/1.1"), <responsecode> is a 3-digit response code indicating success or failure of the request, and <responsestring> is an optional human-readable string explaining what the response code means. This server parses the request and the headers, and then calls a function specific to the request type (<command>). Specifically, a request SPAM will be handled by a method do_SPAM(). If no such method exists the server sends an error response to the client. If it exists, it is called with no arguments: do_SPAM() Note that the request name is case sensitive (i.e. SPAM and spam are different requests). The various request details are stored in instance variables: - client_address is the client IP address in the form (host, port); - command, path and version are the broken-down request line; - headers is an instance of email.message.Message (or a derived class) containing the header information; - rfile is a file object open for reading positioned at the start of the optional input data part; - wfile is a file object open for writing. IT IS IMPORTANT TO ADHERE TO THE PROTOCOL FOR WRITING! The first thing to be written must be the response line. Then follow 0 or more header lines, then a blank line, and then the actual data (if any). The meaning of the header lines depends on the command executed by the server; in most cases, when data is returned, there should be at least one header line of the form Content-type: <type>/<subtype> where <type> and <subtype> should be registered MIME types, e.g. "text/html" or "text/plain". """ # The Python system version, truncated to its first component. sys_version = "Python/" + sys.version.split()[0] # The server software version. You may want to override this. # The format is multiple whitespace-separated strings, # where each string is of the form name[/version]. server_version = "BaseHTTP" error_message_format = DEFAULT_ERROR_MESSAGE error_content_type = DEFAULT_ERROR_CONTENT_TYPE # The default request version. This only affects responses up until # the point where the request line is parsed, so it mainly decides what # the client gets back when sending a malformed request line. # Most web servers default to HTTP 0.9, i.e. don't send a status line. default_request_version = "HTTP/0.9" def parse_request(self): """Parse a request (internal). The request should be stored in self.raw_requestline; the results are in self.command, self.path, self.request_version and self.headers. Return True for success, False for failure; on failure, any relevant error response has already been sent back. """ is_http_0_9 = False self.command = None # set in case of error on the first line self.request_version = version = self.default_request_version self.close_connection = True requestline = str(self.raw_requestline, 'iso-8859-1') requestline = requestline.rstrip('\r\n') self.requestline = requestline words = requestline.split() if len(words) == 0: return False if len(words) >= 3: # Enough to determine protocol version version = words[-1] try: if not version.startswith('HTTP/'): raise ValueError base_version_number = version.split('/', 1)[1] version_number = base_version_number.split(".") # RFC 2145 section 3.1 says there can be only one "." and # - major and minor numbers MUST be treated as # separate integers; # - HTTP/2.4 is a lower version than HTTP/2.13, which in # turn is lower than HTTP/12.3; # - Leading zeros MUST be ignored by recipients. if len(version_number) != 2: raise ValueError if any(not component.isdigit() for component in version_number): raise ValueError("non digit in http version") if any(len(component) > 10 for component in version_number): raise ValueError("unreasonable length http version") version_number = int(version_number[0]), int(version_number[1]) except (ValueError, IndexError): # Send the error response with a status line and headers. self.request_version = '' self.send_error( HTTPStatus.BAD_REQUEST, "Bad request version (%r)" % version) return False self.request_version = version if version_number >= (1, 1) and self.protocol_version >= "HTTP/1.1": self.close_connection = False if version_number >= (2, 0): self.send_error( HTTPStatus.HTTP_VERSION_NOT_SUPPORTED, "Invalid HTTP version (%s)" % base_version_number) return False if not 2 <= len(words) <= 3: self.request_version = '' self.send_error( HTTPStatus.BAD_REQUEST, "Bad request syntax (%r)" % requestline) return False command, path = words[:2] if len(words) == 2: self.close_connection = True if command != 'GET': self.request_version = '' self.send_error( HTTPStatus.BAD_REQUEST, "Bad HTTP/0.9 request type (%r)" % command) return False is_http_0_9 = True self.command, self.path = command, path # gh-87389: The purpose of replacing '//' with '/' is to protect # against open redirect attacks possibly triggered if the path starts # with '//' because http clients treat //path as an absolute URI # without scheme (similar to http://path) rather than a path. if self.path.startswith('//'): self.path = '/' + self.path.lstrip('/') # Reduce to a single / # For HTTP/0.9, headers are not expected at all. if is_http_0_9: self.headers = {} return True # Examine the headers and look for a Connection directive. try: self.headers = http.client.parse_headers(self.rfile, _class=self.MessageClass) except http.client.LineTooLong as err: self.send_error( HTTPStatus.REQUEST_HEADER_FIELDS_TOO_LARGE, "Line too long", str(err)) return False except http.client.HTTPException as err: self.send_error( HTTPStatus.REQUEST_HEADER_FIELDS_TOO_LARGE, "Too many headers", str(err) ) return False conntype = self.headers.get('Connection', "") if conntype.lower() == 'close': self.close_connection = True elif (conntype.lower() == 'keep-alive' and self.protocol_version >= "HTTP/1.1"): self.close_connection = False # Examine the headers and look for an Expect directive expect = self.headers.get('Expect', "") if (expect.lower() == "100-continue" and self.protocol_version >= "HTTP/1.1" and self.request_version >= "HTTP/1.1"): if not self.handle_expect_100(): return False return True def handle_expect_100(self): """Decide what to do with an "Expect: 100-continue" header. If the client is expecting a 100 Continue response, we must respond with either a 100 Continue or a final response before waiting for the request body. The default is to always respond with a 100 Continue. You can behave differently (for example, reject unauthorized requests) by overriding this method. This method should either return True (possibly after sending a 100 Continue response) or send an error response and return False. """ self.send_response_only(HTTPStatus.CONTINUE) self.end_headers() return True def handle_one_request(self): """Handle a single HTTP request. You normally don't need to override this method; see the class __doc__ string for information on how to handle specific HTTP commands such as GET and POST. """ try: self.raw_requestline = self.rfile.readline(65537) if len(self.raw_requestline) > 65536: self.requestline = '' self.request_version = '' self.command = '' self.send_error(HTTPStatus.REQUEST_URI_TOO_LONG) return if not self.raw_requestline: self.close_connection = True return if not self.parse_request(): # An error code has been sent, just exit return mname = 'do_' + self.command if not hasattr(self, mname): self.send_error( HTTPStatus.NOT_IMPLEMENTED, "Unsupported method (%r)" % self.command) return method = getattr(self, mname) method() self.wfile.flush() #actually send the response if not already done. except TimeoutError as e: #a read or a write timed out. Discard this connection self.log_error("Request timed out: %r", e) self.close_connection = True return def handle(self): """Handle multiple requests if necessary.""" self.close_connection = True self.handle_one_request() while not self.close_connection: self.handle_one_request() def send_error(self, code, message=None, explain=None): """Send and log an error reply. Arguments are * code: an HTTP error code 3 digits * message: a simple optional 1 line reason phrase. *( HTAB / SP / VCHAR / %x80-FF ) defaults to short entry matching the response code * explain: a detailed message defaults to the long entry matching the response code. This sends an error response (so it must be called before any output has been generated), logs the error, and finally sends a piece of HTML explaining the error to the user. """ try: shortmsg, longmsg = self.responses[code] except KeyError: shortmsg, longmsg = '???', '???' if message is None: message = shortmsg if explain is None: explain = longmsg self.log_error("code %d, message %s", code, message) self.send_response(code, message) self.send_header('Connection', 'close') # Message body is omitted for cases described in: # - RFC7230: 3.3. 1xx, 204(No Content), 304(Not Modified) # - RFC7231: 6.3.6. 205(Reset Content) body = None if (code >= 200 and code not in (HTTPStatus.NO_CONTENT, HTTPStatus.RESET_CONTENT, HTTPStatus.NOT_MODIFIED)): # HTML encode to prevent Cross Site Scripting attacks # (see bug #1100201) content = (self.error_message_format % { 'code': code, 'message': html.escape(message, quote=False), 'explain': html.escape(explain, quote=False) }) body = content.encode('UTF-8', 'replace') self.send_header("Content-Type", self.error_content_type) self.send_header('Content-Length', str(len(body))) self.end_headers() if self.command != 'HEAD' and body: self.wfile.write(body) def send_response(self, code, message=None): """Add the response header to the headers buffer and log the response code. Also send two standard headers with the server software version and the current date. """ self.log_request(code) self.send_response_only(code, message) self.send_header('Server', self.version_string()) self.send_header('Date', self.date_time_string()) def send_response_only(self, code, message=None): """Send the response header only.""" if self.request_version != 'HTTP/0.9': if message is None: if code in self.responses: message = self.responses[code][0] else: message = '' if not hasattr(self, '_headers_buffer'): self._headers_buffer = [] self._headers_buffer.append(("%s %d %s\r\n" % (self.protocol_version, code, message)).encode( 'latin-1', 'strict')) def send_header(self, keyword, value, *, _is_extra=False): """Send a MIME header to the headers buffer.""" if self.request_version != 'HTTP/0.9': if not hasattr(self, '_headers_buffer'): self._headers_buffer = [] self._headers_buffer.append( ("%s: %s\r\n" % (keyword, value)).encode('latin-1', 'strict')) if not hasattr(self, '_default_response_headers'): self._default_response_headers = [] if not _is_extra: self._default_response_headers.append((keyword, value)) if keyword.lower() == 'connection': if value.lower() == 'close': self.close_connection = True elif value.lower() == 'keep-alive': self.close_connection = False def end_headers(self): """Send the blank line ending the MIME headers.""" if self.request_version != 'HTTP/0.9': self._headers_buffer.append(b"\r\n") self.flush_headers() def flush_headers(self): if hasattr(self, '_headers_buffer'): self.wfile.write(b"".join(self._headers_buffer)) self._headers_buffer = [] if hasattr(self, '_default_response_headers'): self._default_response_headers = [] def _colorize_request(self, code, size, t): try: code_int = int(code) except (TypeError, ValueError): code_color = "" else: if code_int >= 500: code_color = t.status_server_error elif code_int >= 400: code_color = t.status_client_error elif code_int >= 300: code_color = t.status_redirect elif code_int >= 200: code_color = t.status_ok else: code_color = t.status_informational request_line = self.requestline.translate(self._control_char_table) parts = request_line.split(None, 2) if len(parts) == 3: method, path, version = parts request_line = f"{method} {t.path}{path}{t.reset} {version}" return f'"{request_line}" {code_color}{code} {t.size}{size}{t.reset}' def log_request(self, code='-', size='-'): """Log an accepted request. This is called by send_response(). """ if isinstance(code, HTTPStatus): code = code.value self._log_request_info = (code, size) self.log_message('"%s" %s %s', self.requestline, str(code), str(size)) def log_error(self, format, *args): """Log an error. This is called when a request cannot be fulfilled. By default it passes the message on to log_message(). Arguments are the same as for log_message(). XXX This should go to the separate error log. """ self._log_is_error = True self.log_message(format, *args) # https://en.wikipedia.org/wiki/List_of_Unicode_characters#Control_codes _control_char_table = str.maketrans( {c: fr'\x{c:02x}' for c in itertools.chain(range(0x20), range(0x7f,0xa0))}) _control_char_table[ord('\\')] = r'\\' def log_message(self, format, *args): """Log an arbitrary message. This is used by all other logging functions. Override it if you have specific logging wishes. The first argument, FORMAT, is a format string for the message to be logged. If the format string contains any % escapes requiring parameters, they should be specified as subsequent arguments (it's just like printf!). The client ip and current date/time are prefixed to every message. Unicode control characters are replaced with escaped hex before writing the output to stderr. """ message = (format % args).translate(self._control_char_table) t = _colorize.get_theme(tty_file=sys.stderr).http_server info = getattr(self, "_log_request_info", None) if info is not None: self._log_request_info = None message = self._colorize_request(*info, t) elif getattr(self, "_log_is_error", False): self._log_is_error = False message = f"{t.error}{message}{t.reset}" sys.stderr.write( f"{t.timestamp}{self.address_string()} - - " f"[{self.log_date_time_string()}]{t.reset} " f"{message}\n" ) def version_string(self): """Return the server software version string.""" return self.server_version + ' ' + self.sys_version def date_time_string(self, timestamp=None): """Return the current date and time formatted for a message header.""" if timestamp is None: timestamp = time.time() return email.utils.formatdate(timestamp, usegmt=True) def log_date_time_string(self): """Return the current time formatted for logging.""" now = time.time() year, month, day, hh, mm, ss, x, y, z = time.localtime(now) s = "%02d/%3s/%04d %02d:%02d:%02d" % ( day, self.monthname[month], year, hh, mm, ss) return s weekdayname = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] monthname = [None, 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] def address_string(self): """Return the client address.""" return self.client_address[0] # Essentially static class variables # The version of the HTTP protocol we support. # Set this to HTTP/1.1 to enable automatic keepalive protocol_version = "HTTP/1.0" # MessageClass used to parse headers MessageClass = http.client.HTTPMessage # hack to maintain backwards compatibility responses = { v: (v.phrase, v.description) for v in HTTPStatus.__members__.values() } class SimpleHTTPRequestHandler(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 = "SimpleHTTP" default_content_type = "application/octet-stream" index_pages = ("index.html", "index.htm") extensions_map = _encodings_map_default = { '.gz': 'application/gzip', '.Z': 'application/octet-stream', '.bz2': 'application/x-bzip2', '.xz': 'application/x-xz', } def __init__(self, *args, directory=None, extra_response_headers=None, **kwargs): if directory is None: directory = os.getcwd() self.directory = os.fspath(directory) self.extra_response_headers = extra_response_headers super().__init__(*args, **kwargs) def do_GET(self): """Serve a GET request.""" f = self.send_head() if f: try: self.copyfile(f, self.wfile) finally: f.close() def do_HEAD(self): """Serve a HEAD request.""" f = self.send_head() if f: f.close() def _send_extra_response_headers(self): """Send the headers stored in self.extra_response_headers.""" if self.extra_response_headers is not None: default_headers = {h.lower() for h, _ in self._default_response_headers} for header, value in self.extra_response_headers: # Don't send the header if it's already sent # as part of the default response headers if header.lower() not in default_headers: self.send_header(header, value, _is_extra=True) 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): parts = urllib.parse.urlsplit(self.path) if not parts.path.endswith(('/', '%2f', '%2F')): # redirect browser - doing basically what apache does self.send_response(HTTPStatus.MOVED_PERMANENTLY) new_parts = (parts[0], parts[1], parts[2] + '/', parts[3], parts[4]) new_url = urllib.parse.urlunsplit(new_parts) self.send_header("Location", new_url) self.send_header("Content-Length", "0") self.end_headers() return None for index in self.index_pages: index = os.path.join(path, index) if os.path.isfile(index): path = index break else: return self.list_directory(path) ctype = self.guess_type(path) # check for trailing "/" which should return 404. See Issue17324 # The test for this was added in test_httpserver.py # However, some OS platforms accept a trailingSlash as a filename # See discussion on python-dev and Issue34711 regarding # parsing and rejection of filenames with a trailing slash if path.endswith("/"): self.send_error(HTTPStatus.NOT_FOUND, "File not found") return None try: f = open(path, 'rb') except OSError: self.send_error(HTTPStatus.NOT_FOUND, "File not found") return None try: fs = os.fstat(f.fileno()) # Use browser cache if possible if ("If-Modified-Since" in self.headers and "If-None-Match" not in self.headers): # compare If-Modified-Since and time of last file modification try: ims = email.utils.parsedate_to_datetime( self.headers["If-Modified-Since"]) except (TypeError, IndexError, OverflowError, ValueError): # ignore ill-formed values pass else: if ims.tzinfo is None: # obsolete format with no timezone, cf. # https://tools.ietf.org/html/rfc7231#section-7.1.1.1 ims = ims.replace(tzinfo=datetime.timezone.utc) if ims.tzinfo is datetime.timezone.utc: # compare to UTC datetime of last modification last_modif = datetime.datetime.fromtimestamp( fs.st_mtime, datetime.timezone.utc) # remove microseconds, like in If-Modified-Since last_modif = last_modif.replace(microsecond=0) if last_modif <= ims: self.send_response(HTTPStatus.NOT_MODIFIED) self.end_headers() f.close() return None self.send_response(HTTPStatus.OK) self.send_header("Content-type", ctype) self.send_header("Content-Length", str(fs[6])) self.send_header("Last-Modified", self.date_time_string(fs.st_mtime)) self._send_extra_response_headers() self.end_headers() return f except: f.close() raise 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: list = os.listdir(path) except OSError: self.send_error( HTTPStatus.NOT_FOUND, "No permission to list directory") return None list.sort(key=lambda a: a.lower()) r = [] displaypath = self.path displaypath = displaypath.split('#', 1)[0] displaypath = displaypath.split('?', 1)[0] try: displaypath = urllib.parse.unquote(displaypath, errors='surrogatepass') except UnicodeDecodeError: displaypath = urllib.parse.unquote(displaypath) displaypath = html.escape(displaypath, quote=False) enc = sys.getfilesystemencoding() title = f'Directory listing for {displaypath}' r.append('<!DOCTYPE HTML>') r.append('<html lang="en">') r.append('<head>') r.append(f'<meta charset="{enc}">') r.append('<style type="text/css">\n:root {\ncolor-scheme: light dark;\n}\n</style>') r.append(f'<title>{title}</title>\n</head>') r.append(f'<body>\n<h1>{title}</h1>') r.append('<hr>\n<ul>') for name in list: fullname = os.path.join(path, name) displayname = linkname = name # Append / for directories or @ for symbolic links if os.path.isdir(fullname): displayname = name + "/" linkname = name + "/" if os.path.islink(fullname): displayname = name + "@" # Note: a link to a directory displays with @ and links with / r.append('<li><a href="%s">%s</a></li>' % (urllib.parse.quote(linkname, errors='surrogatepass'), html.escape(displayname, quote=False))) r.append('</ul>\n<hr>\n</body>\n</html>\n') encoded = '\n'.join(r).encode(enc, 'surrogateescape') f = io.BytesIO() f.write(encoded) f.seek(0) self.send_response(HTTPStatus.OK) self.send_header("Content-type", "text/html; charset=%s" % enc) self.send_header("Content-Length", str(len(encoded))) self._send_extra_response_headers() self.end_headers() return f 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] # Don't forget explicit trailing slash when normalizing. Issue17324 try: path = urllib.parse.unquote(path, errors='surrogatepass') except UnicodeDecodeError: path = urllib.parse.unquote(path) trailing_slash = path.endswith('/') path = posixpath.normpath(path) words = path.split('/') words = filter(None, words) path = self.directory for word in words: if os.path.dirname(word) or word in (os.curdir, os.pardir): # Ignore components that are not a simple file/directory name continue path = os.path.join(path, word) if trailing_slash: path += '/' return path def copyfile(self, source, outputfile): """Copy all data between two file objects. The SOURCE argument is a file object open for reading (or anything with a read() method) and the DESTINATION argument is a file object open for writing (or anything with a write() method). The only reason for overriding this would be to change the block size or perhaps to replace newlines by CRLF -- note however that this the default server uses this to copy binary data as well. """ shutil.copyfileobj(source, outputfile) 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.extensions_map: return self.extensions_map[ext] ext = ext.lower() if ext in self.extensions_map: return self.extensions_map[ext] guess, _ = mimetypes.guess_file_type(path) if guess: return guess |
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