/
web.py
311 lines (259 loc) · 10.5 KB
/
web.py
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
import errno
import os
import select
import socket
import sys
import traceback
import time
import argparse
from wsgiref.handlers import format_date_time
from datetime import datetime
from time import mktime
seconds = lambda: int(time.time())
class HttpRequest:
def __init__(self, method, url, version, headers, body, is_complete):
self.method = method
self.url = url
self.version = version
self.headers = headers
self.body = body
self.is_complete = is_complete
def append(self, data):
self.body += data
def body_complete(self):
return len(self.body) == int(self.headers[WebServer.content_length_header])
# noinspection PyAttributeOutsideInit
class WebServer:
server_header = 'Server: Tyler-Davis-Awesome-Web-Server-Even-Though-It-Is-In-Python\r\n'
content_length_header = 'Content-Length:'
host_header = 'Host:'
content_type_header = 'Content-Type:'
date_header = 'Date:'
last_modified_header = 'Last-Modified:'
def __init__(self, port):
self.read_conf()
self.port = port
self.open_socket()
self.clients = {}
self.size = 10024
self.timeout = int(self.parameter['timeout'])
def read_conf(self):
self.hosts = {}
self.media = {}
self.parameter = {}
with open('web.conf') as conf:
for line in conf:
split = line.split(' ')
if split[0] == 'host':
self.hosts[split[1]] = split[2].strip()
elif split[0] == 'media':
self.media[split[1]] = split[2].strip()
elif split[0] == 'parameter':
self.parameter[split[1]] = split[2].strip()
def open_socket(self):
try:
self.server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.server.bind(('', self.port))
self.server.listen(5)
self.server.setblocking(0)
except socket.error, (value, message):
if self.server:
self.server.close()
print "Could not open socket: " + message
sys.exit(1)
def run(self):
self.poller = select.epoll()
self.pollmask = select.EPOLLIN | select.EPOLLHUP | select.EPOLLERR
self.poller.register(self.server, self.pollmask)
while True:
try:
fds = self.poller.poll(timeout=self.timeout)
except:
return
for (fd, event) in fds:
if event & (select.POLLHUP | select.POLLERR):
self.handle_error(fd)
continue
if fd == self.server.fileno():
self.handle_server()
else:
self.handle_client(fd)
to_delete = []
for fileNo, client in self.clients.iteritems():
inactive_time = seconds() - client[1]
if inactive_time > self.timeout:
to_delete.append(fileNo)
for fileNo in to_delete:
self.close_client(fileNo)
def close_client(self, fd):
self.poller.unregister(fd)
self.clients[fd][0].close()
del self.clients[fd]
def handle_error(self, fd):
self.poller.unregister(fd)
if fd == self.server.fileno():
self.server.close()
self.open_socket()
self.poller.register(self.server, self.pollmask)
else:
self.clients[fd][0].close()
del self.clients[fd]
def handle_server(self):
while True:
try:
(client, address) = self.server.accept()
except socket.error, (value, message):
if value == errno.EAGAIN or errno.EWOULDBLOCK:
return
print traceback.format_exc()
sys.exit()
client.setblocking(0)
client_data = ''
self.clients[client.fileno()] = [client, seconds(), client_data]
self.poller.register(client.fileno(), self.pollmask)
def handle_client(self, fd):
if fd not in self.clients:
return
client = self.clients[fd]
try:
data = client[0].recv(self.size)
except socket.error, (value, message):
if value == errno.EAGAIN or errno.EWOULDBLOCK:
return
print traceback.format_exc()
sys.exit()
if data:
if len(client) == 3:
client[2] += data
if '\r\n\r\n' in client[2]:
result = self.parse_http(client[2])
if type(result) is str:
client[0].send(result)
elif result.is_complete:
self.send_response(client, self.respond_get(result), fd)
else:
client.append(result)
client[2] = ''
else:
request = client[3]
request.append(data)
if request.body_complete():
self.send_response(client, self.respond_get(request), fd)
del client[3]
else:
self.close_client(fd)
client[1] = seconds()
def send_response(self, client, response, fd):
# print response
client[0].send(response)
def parse_http(self, request):
try:
# print request
http_and_body = request.split('\r\n\r\n')
lines = http_and_body[0].split('\r\n')
request_line = lines[0].split(' ')
del lines[0]
headers = {}
for line in lines:
split = line.split(' ')
headers[split[0]] = split[1]
complete = False
body = ''
if self.content_length_header in headers:
if len(http_and_body) == 2:
body = http_and_body[1]
if len(body) == int(headers[self.content_length_header]):
complete = True
else:
complete = True
return HttpRequest(request_line[0], request_line[1], ' '.join(request_line[2:]), headers, body, complete)
except:
return WebServer.respond_400()
@staticmethod
def respond_400():
body = '<h1>400 Bad Request</h1>'
length = str(len(body))
return WebServer.append_static_headers('HTTP/1.1 400 Bad Request\r\n' + WebServer.server_header + WebServer.content_length_header + ' ' + length + '\r\n') + body
@staticmethod
def respond_403():
body = '<h1>403 Forbidden</h1>'
length = str(len(body))
return WebServer.append_static_headers('HTTP/1.1 403 Forbidden\r\n' + WebServer.server_header + WebServer.content_length_header + ' ' + length + '\r\n') + body
@staticmethod
def respond_404():
body = '<h1>404 Not Found</h1>'
length = str(len(body))
return WebServer.append_static_headers('HTTP/1.1 404 Not Found\r\n' + WebServer.server_header + WebServer.content_length_header + ' ' + length + '\r\n') + body
@staticmethod
def respond_500():
body = '<h1>500 Internal Server Error</h1>'
length = str(len(body))
return WebServer.append_static_headers('HTTP/1.1 500 Internal Server Error' + WebServer.server_header + WebServer.content_length_header + ' ' + length + '\r\n') + body
@staticmethod
def respond_501():
body = '<h1>501 Not Implemented</h1>'
length = str(len(body))
return WebServer.append_static_headers('HTTP/1.1 501 Not Implemented\r\n' + WebServer.server_header + WebServer.content_length_header + ' ' + length + '\r\n') + body
@staticmethod
def append_static_headers(response):
now = datetime.now()
stamp = mktime(now.timetuple())
response += WebServer.date_header + ' ' + format_date_time(stamp) + '\r\n'
response += WebServer.content_type_header + ' text/html\r\n'
response += WebServer.last_modified_header + ' ' + format_date_time(stamp) + '\r\n\r\n'
return response
def respond_get(self, request):
try:
if request.method != 'GET':
return WebServer.respond_501()
response = 'HTTP/1.1 200 OK\r\n' + WebServer.server_header
if WebServer.host_header in request.headers:
host = request.headers[WebServer.host_header].split(':')
if host[0] in self.hosts:
file_name = self.hosts[host[0]]
else:
file_name = self.hosts['default']
else:
file_name = self.hosts['default']
if request.url == '/':
file_name += '/index.html'
else:
file_name += request.url
if os.path.isfile(file_name):
body = open(file_name, "rb").read()
else:
return WebServer.respond_404()
extension = os.path.splitext(file_name)[1][1:]
if extension in self.media:
response += WebServer.content_type_header + ' ' + self.media[extension] + '\r\n'
now = datetime.now()
stamp = mktime(now.timetuple())
response += WebServer.date_header + ' ' + format_date_time(stamp) + '\r\n'
stamp = mktime(datetime.strptime(time.ctime(os.path.getmtime(file_name)), "%a %b %d %H:%M:%S %Y").timetuple())
response += WebServer.last_modified_header + ' ' + format_date_time(stamp) + '\r\n'
length = str(len(body))
response += WebServer.content_length_header + ' ' + length + '\r\n\r\n' + body
return response
except Exception, err:
if err[0] == 13:
return WebServer.respond_403()
print traceback.format_exc()
return WebServer.respond_500()
class Main:
def __init__(self):
self.parse_arguments()
def parse_arguments(self):
parser = argparse.ArgumentParser(prog='Web Server', description='A web server', add_help=True)
parser.add_argument('-p', '--port', type=int, action='store', help='port the server will bind to', default=8080)
self.args = parser.parse_args()
def run(self):
p = WebServer(self.args.port)
p.run()
if __name__ == "__main__":
m = Main()
m.parse_arguments()
try:
m.run()
except KeyboardInterrupt:
pass