from __future__ import (absolute_import, print_function, division) from io import BytesIO, StringIO import urllib import time import traceback import six from six.moves import urllib from netlib.utils import always_bytes, native from . import http, tcp class ClientConn(object): def __init__(self, address): self.address = tcp.Address.wrap(address) class Flow(object): def __init__(self, address, request): self.client_conn = ClientConn(address) self.request = request class Request(object): def __init__(self, scheme, method, path, http_version, headers, content): self.scheme, self.method, self.path = scheme, method, path self.headers, self.content = headers, content self.http_version = http_version def date_time_string(): """Return the current date and time formatted for a message header.""" WEEKS = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] MONTHS = [ None, 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec' ] now = time.time() year, month, day, hh, mm, ss, wd, y_, z_ = time.gmtime(now) s = "%s, %02d %3s %4d %02d:%02d:%02d GMT" % ( WEEKS[wd], day, MONTHS[month], year, hh, mm, ss ) return s class WSGIAdaptor(object): def __init__(self, app, domain, port, sversion): self.app, self.domain, self.port, self.sversion = app, domain, port, sversion def make_environ(self, flow, errsoc, **extra): path = native(flow.request.path, "latin-1") if '?' in path: path_info, query = native(path, "latin-1").split('?', 1) else: path_info = path query = '' environ = { 'wsgi.version': (1, 0), 'wsgi.url_scheme': native(flow.request.scheme, "latin-1"), 'wsgi.input': BytesIO(flow.request.content or b""), 'wsgi.errors': errsoc, 'wsgi.multithread': True, 'wsgi.multiprocess': False, 'wsgi.run_once': False, 'SERVER_SOFTWARE': self.sversion, 'REQUEST_METHOD': native(flow.request.method, "latin-1"), 'SCRIPT_NAME': '', 'PATH_INFO': urllib.parse.unquote(path_info), 'QUERY_STRING': query, 'CONTENT_TYPE': native(flow.request.headers.get('Content-Type', ''), "latin-1"), 'CONTENT_LENGTH': native(flow.request.headers.get('Content-Length', ''), "latin-1"), 'SERVER_NAME': self.domain, 'SERVER_PORT': str(self.port), 'SERVER_PROTOCOL': native(flow.request.http_version, "latin-1"), } environ.update(extra) if flow.client_conn.address: environ["REMOTE_ADDR"] = native(flow.client_conn.address.host, "latin-1") environ["REMOTE_PORT"] = flow.client_conn.address.port for key, value in flow.request.headers.items(): key = 'HTTP_' + native(key, "latin-1").upper().replace('-', '_') if key not in ('HTTP_CONTENT_TYPE', 'HTTP_CONTENT_LENGTH'): environ[key] = value return environ def error_page(self, soc, headers_sent, s): """ Make a best-effort attempt to write an error page. If headers are already sent, we just bung the error into the page. """ c = """

Internal Server Error

{err}"
""".format(err=s).strip().encode() if not headers_sent: soc.write(b"HTTP/1.1 500 Internal Server Error\r\n") soc.write(b"Content-Type: text/html\r\n") soc.write("Content-Length: {length}\r\n".format(length=len(c)).encode()) soc.write(b"\r\n") soc.write(c) def serve(self, request, soc, **env): state = dict( response_started=False, headers_sent=False, status=None, headers=None ) def write(data): if not state["headers_sent"]: soc.write("HTTP/1.1 {status}\r\n".format(status=state["status"]).encode()) headers = state["headers"] if 'server' not in headers: headers["Server"] = self.sversion if 'date' not in headers: headers["Date"] = date_time_string() soc.write(bytes(headers)) soc.write(b"\r\n") state["headers_sent"] = True if data: soc.write(data) soc.flush() def start_response(status, headers, exc_info=None): if exc_info: if state["headers_sent"]: six.reraise(*exc_info) elif state["status"]: raise AssertionError('Response already started') state["status"] = status state["headers"] = http.Headers([[always_bytes(k), always_bytes(v)] for k,v in headers]) if exc_info: self.error_page(soc, state["headers_sent"], traceback.format_tb(exc_info[2])) state["headers_sent"] = True errs = six.BytesIO() try: dataiter = self.app( self.make_environ(request, errs, **env), start_response ) for i in dataiter: write(i) if not state["headers_sent"]: write(b"") except Exception as e: try: s = traceback.format_exc() errs.write(s.encode("utf-8", "replace")) self.error_page(soc, state["headers_sent"], s) except Exception: # pragma: no cover pass return errs.getvalue()