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srv.py
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srv.py
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#!/usr/bin/python3
import base64
import configparser
from fileinput import close
from genericpath import isdir
from http.server import HTTPServer as HTTPServer, \
SimpleHTTPRequestHandler as SimpleHTTPRequestHandler
from io import BytesIO as BytesIO, StringIO
import os.path
import posixpath
import re
import shutil
import socket
import time
from urllib import parse
import urllib
import uuid
from zipfile import ZipFile
from concurrent.futures.thread import ThreadPoolExecutor
from argparse import ArgumentParser
import logging
class HTTPException(Exception):
def __init__(self, message="", code=500, cause=None):
Exception.__init__(self)
self.message = message
self.code = code
self.__cause__ = cause
class BaseMappedHandler:
def __init__(self, base_path="", logger=None):
self.base_path = base_path
self.logger = logger
def process(self, request, response):
m = getattr(self, "do_" + request.method.upper())
if m != None:
m(request, response)
else:
response.send_error(501)
def do_HEAD(self, request, response):
pass
def do_OPTIONS(self, request, response):
pass
def do_GET(self, request, response):
pass
def do_POST(self, request, response):
pass
def do_PUT(self, request, response):
pass
def do_DELETE(self, request, response):
pass
class DispatcherHTTPServer(HTTPServer):
def __init__(self, server_address, RequestHandlerClass,
bind_and_activate=True, handlers=[],
srv_path=".",
configuration={}):
HTTPServer.__init__(self, server_address, RequestHandlerClass, bind_and_activate)
self.handlers = sorted(handlers, key=lambda k: k["weight"])
self.srv_path = srv_path
self.configuration = configuration
self.logger = self.setup_logger()
self.executor = ThreadPoolExecutor(max_workers=20)
self.initialize_server()
def initialize_server(self):
self.logger.info('Initializing server')
def finish_request(self, request, client_address):
def async_finish_request(server, request, client_address, logger):
server.RequestHandlerClass(request, client_address, server, logger)
self.executor.submit(async_finish_request(self, request, client_address, self.logger))
def setup_logger(self):
logger = None
if self.configuration.get('log_config_file') is not None:
logger = self.get_logger(self.configuration.get('log_config_file'))
else:
logger = self.get_default_logger()
return logger
def get_logger(self, config_file):
logging.config.fileConfig(config_file)
return logging.getLogger('srv')
def get_default_logger(self):
logging.basicConfig(level=logging.INFO)
return logging.getLogger('srv')
class HTTPSession:
def __init__(self):
self.id = str(uuid.uuid4())
self.attributes = {}
self.invalid = False
def set(self, name, value):
self.attributes[name] = value
def rem(self, name):
val = self.attributes.get(name)
if val != None:
del self.attributes[name]
class HTTPRequest:
def __init__(self):
self.method = ""
self.query_string = ""
self.in_stream = ""
self.params = {}
self.files = {}
self.path = ""
self.request_url = ""
self.session = {}
self.attributes = {}
self.headers = {}
self.remote_ip = ""
self.host = ("", 0) # Tupple (name, port)
self.scheme = "HTTP"
self.protocol_version = "1.0"
self.forwarded = False
def get_session(self):
if self.session == None:
self.session = HTTPSession()
def forward(self, to_path):
self.forwarded = True
self.path = to_path
class HTTPResponse:
def __init__(self):
self.code = 200
self.message = ""
self.error = False
self.out_stream = BytesIO()
self.headers = {}
def write(self, msg):
if(isinstance(msg, str)):
self.out_stream.write(msg.encode())
else:
self.out_stream.write(msg)
def send_error(self, code, message=None):
self.code = code
self.message = message
def redirect(self, to_url):
self.code = 301
self.headers["Location"] = to_url
class DispatcherHTTPHandler(SimpleHTTPRequestHandler):
def __init__(self, request, client_address, server, logger):
self.logger = logger
SimpleHTTPRequestHandler.__init__(self, request, client_address, server)
def handle_one_request(self):
"""
Overrides the method in the base HTTP handler
"""
try:
self.raw_requestline = self.rfile.readline(65537)
if len(self.raw_requestline) > 65536:
self.requestline = ''
self.request_version = ''
self.command = ''
self.send_error(414)
return
if not self.raw_requestline:
self.close_connection = 1
return
if not self.parse_request():
# An error code has been sent, just exit
return
self.do_handle_one_request(self.path)
self.wfile.flush() # actually send the response if not already done.
except socket.timeout as e:
# a read or a write timed out. Discard this connection
self.logger.error("Request timed out: %r", e)
self.close_connection = 1
return
def do_handle_one_request(self, path, request=None):
self.path = path
self.logger.debug("PATH: %r (%r)", self.path, self.command)
for hndDef in self.server.handlers:
self.logger.debug("\t Checking [%r]", hndDef["name"])
pattern = hndDef["pattern"]
for p in pattern:
if re.match(p, self.path):
self.logger.debug("\t\t-> match")
hnd = hndDef["handler"]
if(request == None):
request = self.construct_request()
response = self.construct_response()
hnd.base_path = os.path.abspath(self.server.srv_path) # TODO
hnd.logger = self.logger # FIXME: pass to constructor
hnd.process(request, response)
self.process_response(request, response)
return
self.logger.debug("Pass to default...")
self.process_default_request()
self.logger.debug("Processing ended.")
def construct_request(self):
req = HTTPRequest()
req.path, qm, req.query_string = self.path.partition("?")
req.headers = self.headers
req.method = self.command
req.host = (self.server.server_name, self.server.server_port)
req.remote_ip, remote_port = self.client_address
req.scheme, sep, req.protocol_version = self.protocol_version.partition("/")
req.in_stream = BytesIO()
cl = self.headers.get("Content-Length")
body = ''
if(cl is not None):
cl = int(str(cl))
req.in_stream.write(self.rfile.read(cl))
body = req.in_stream.getvalue()
if (body is not None):
body = body.decode("utf-8") # FIXME: use the proper encoding here...
else:
body = ""
req.params = self._parse_request_params(req.method, body, "")
self.logger.debug('Request params: %s'%req.params)
return req
def _parse_request_params(self, method, body, query_string):
params = {}
if(method == 'POST' or method == 'GET'):
body = urllib.parse.unquote(body)
body = body[:-1]
raw_params = urllib.parse.parse_qs(body) or {}
params = self.__fix_params(raw_params)
query_params = urllib.parse.parse_qs(query_string)
if(query_params == None):
query_params = {}
query_params = self.__fix_params(query_params)
if(params == None):
params = {}
params.update(query_params)
return params
def __fix_params(self, raw_params):
params = {}
for name, value in raw_params.items():
if (len(value) == 1):
params[name] = value[0]
else:
params[name] = value
return params
def construct_response(self):
return HTTPResponse()
def process_response(self, request, response):
if(request.forwarded):
request.forwarded = False
self.do_handle_one_request(request.path, request)
return
if(response.error):
self.send_error(response.code, response.message)
return
if(response.code != 200):
self.send_response(response.code, response.message)
else:
self.send_response_only(response.code, response.message)
sent_headers = False
for name, value in response.headers.items():
self.send_header(name, value)
sent_headers = True
if(sent_headers):
self.end_headers()
# shutil.copyfileobj(response.out_stream, self.wfile)
self.wfile.write(response.out_stream.getvalue())
def process_default_request(self):
mname = 'do_' + self.command
if not hasattr(self, mname):
self.send_error(501, "Unsupported method (%r)" % self.command)
return
method = getattr(self, mname)
method()
def log_message(self, format, *args):
self.logger.info('%s'%(format%args) )
class SimpleHandler (BaseMappedHandler):
def do_GET(self, request, response):
try:
abspath = os.path.abspath(self.base_path + "/" + request.path)
if(not abspath.startswith(self.base_path)):
response.send_error(403)
else:
if(os.path.exists(abspath)):
self.do_process(request, response , abspath)
else:
response.send_error(404)
except IOError:
response.send_error(404)
def do_process(self, request, response, abspath):
if isdir(abspath):
if(not request.path.endswith('/')):
response.redirect(request.path + '/')
else:
self.process_dir(request, response, abspath)
else:
self.process_file(request, response, abspath)
def process_dir(self, request, response, abspath):
files = os.listdir(abspath)
listingBuffer = []
params = {}
params["name"] = ".."
params["path"] = request.path + ".."
params["modified"] = time.ctime(os.path.getmtime(abspath + "/.."))
params["full_path"] = abspath + "/.."
params["size"] = "--"
listingBuffer.append(self._format_dir(params))
for fn in files:
try:
file_path = abspath + "/" + fn
params = {}
params["name"] = fn
params["path"] = request.path + fn
params["modified"] = time.ctime(os.path.getmtime(file_path))
params["full_path"] = file_path
if (os.path.isdir(file_path)):
params["size"] = "--"
listingBuffer.append(self._format_dir(params))
else:
fh = open(file_path, "r")
params["size"] = os.fstat(fh.fileno())[6]
fh.close()
listingBuffer.append(self._format_file(params))
except IOError as e:
self.logger.error(e)
g_params = {}
g_params["server_version"] = "0.1.0"
g_params["dir_path"] = abspath
g_params["path"] = request.path
g_params["_FILES_LISTING_"] = ''.join(listingBuffer)
response.headers["Content-Type"] = "text/html";
response.write(self._format_directory_listing(g_params))
def _format_file(self, params):
# return SimpleHandler.FILE_ENTRY_TEMPLATE % params
return _DEFAULT_RC_LOADER.get_resource_str("templates/file.html") % params
def _format_dir(self, params):
# return SimpleHandler.DIRECTORY_ENTRY_TEMPLATE % params
return _DEFAULT_RC_LOADER.get_resource_str("templates/dir.html") % params
def _format_directory_listing(self, params):
# return SimpleHandler.DIRECTORY_LISTING_DOC_TEMPLATE % params
return _DEFAULT_RC_LOADER.get_resource_str("templates/main.html") % params
def process_file(self, request, response, abspath):
response.headers["Content-type"] = self._get_mime_type(request.path)
try:
fh = open(abspath, "rb")
fs = os.fstat(fh.fileno())
response.headers["Content-Length"] = fs[6]
response.headers["Last-Modified"] = self._date_time_string(fs.st_mtime)
shutil.copyfileobj(fh, response.out_stream)
fh.close()
except IOError as ioe:
self.logger.error(ioe)
response.send_error(500, str(ioe))
def _get_mime_type(self, path):
base, ext = posixpath.splitext(path)
if ext in SimpleHTTPRequestHandler.extensions_map:
return SimpleHTTPRequestHandler.extensions_map[ext]
ext = ext.lower()
if ext in SimpleHTTPRequestHandler.extensions_map:
return SimpleHTTPRequestHandler.extensions_map[ext]
else:
return SimpleHTTPRequestHandler.extensions_map['']
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()
year, month, day, hh, mm, ss, wd, y, z = time.gmtime(timestamp)
s = "%s, %02d %3s %4d %02d:%02d:%02d GMT" % (
SimpleHTTPRequestHandler.weekdayname[wd],
day, SimpleHTTPRequestHandler.monthname[month], year,
hh, mm, ss)
return s
_DEFAULT_CONFIG = {
"server":{
"port": 8000,
"serve_path": "."
},
"handlers":{
"__default__": {
"class": "SimpleHandler",
"pattern":".*",
"weight":-1
}
}
}
def read_config(fileName, defaults):
config = configparser.ConfigParser()
config.read(fileName)
cnf = {}
sections = config.sections()
for section in sections:
sec = {}
cnf[section] = sec
for name, value in config.items(section):
cnf[section][name] = value
return cnf
class ClassLoader:
def __init__(self, context={}):
self.context = context
def load_class(self, path):
module, dot, clazz = path.rpartition('.')
try:
mod = __import__(module, context, context, [clazz], -1)
constr = getattr(mod, clazz)
return constr
except Exception as e:
raise Exception(e, "Cannot load class %s" % path)
def get_instance(self, class_name, params=None):
clz = self.load_class(class_name)
instance = None
if params == None:
instance = clz()
else:
instance = clz(*params)
return instance
class ZipLoader:
_ZIP_ARCHIVE_PATTERNS = ['.*\\.zip', '.*\\.jar']
OVERRIDE = 0
IGNORE = 1
IMMEDIATE = 2
LAZY = 4
def __init__(self, path=[], policy=None, loading=None):
self.path = path
self.policy = policy or self.OVERRIDE
self.loading = loading or self.LAZY
self.cache = {}
self.scan()
def scan(self):
for p in self.path:
self._scan(p)
def _scan(self, file_path):
if(isinstance(file_path, str) and os.path.isdir(file_path)):
names = os.listdir(file_path)
for n in names:
self._scan(file_path + '/' + n)
elif (isinstance(file_path, BytesIO)):
self._read_zip_file(file_path)
else:
if(self._is_zip_archive(file_path)):
self._read_zip_file(file_path)
def _read_zip_file(self, zf):
try:
zh = ZipFile(zf, "r")
names = zh.namelist()
for name in names:
existing = self.cache.get(name)
load_now = False
if existing != None:
if self.policy == ZipLoader.OVERRIDE:
load_now = True
else:
load_now = True
if(load_now):
entry = {}
entry["name"] = name
entry["file"] = zh
entry["file_name"] = zf
if(self.loading == ZipLoader.IMMEDIATE):
entry["content"] = self._load_from_archive(name, zh)
self.cache[name] = entry
except Exception as e:
pass
def _load_from_archive(self, name, zip_file):
s = BytesIO()
shutil.copyfileobj(zip_file.open(name, "r"), s)
return s.getvalue()
def _is_zip_archive(self, path):
for pattern in ZipLoader._ZIP_ARCHIVE_PATTERNS:
if (re.match(pattern, path, re.I)):
return True
return False
def get_resource(self, name):
rc = self.cache.get(name)
if rc != None:
content = rc.get("content")
if content == None and self.loading == ZipLoader.LAZY:
content = self._load_from_archive(name, rc["file"])
rc["content"] = content
return content
return None
def get_resource_str(self, name):
rc = self.get_resource(name)
if rc != None:
# b = BytesIO()
# shutil.copyfileobj(BytesIO(rc), b)
# b.write(rc)
# return b.getvalue()decode()
return rc.decode()
return None
class StaticResourcesHandler(BaseMappedHandler):
def do_GET(self, request, response):
self._load_rc(request, response)
def do_POST(self, request, response):
self._load_rc(request, response)
def _load_rc(self, request, response):
path = request.path[1:] # strip the leading /
if(len(path) > 2 and path[:2] == "::"):
rc_path = path[2:]
if(rc_path != None):
rc = _DEFAULT_RC_LOADER.get_resource(rc_path)
if(rc != None):
response.headers["Content-Type"] = self._get_mime_type(rc_path)
response.write(rc)
return
# send 404 otherwise
response.send_error(404)
def _get_mime_type(self, path):
base, ext = posixpath.splitext(path)
if ext in SimpleHTTPRequestHandler.extensions_map:
return SimpleHTTPRequestHandler.extensions_map[ext]
ext = ext.lower()
if ext in SimpleHTTPRequestHandler.extensions_map:
return SimpleHTTPRequestHandler.extensions_map[ext]
else:
return SimpleHTTPRequestHandler.extensions_map['']
def run_server(server_class=HTTPServer,
handler_class=SimpleHTTPRequestHandler,
port=8000,
address='',
srv_path='.'):
"""
The most basic HTTP server.
"""
print("Server is started and listens on port: %d" % port)
server_address = (address, port)
httpd = server_class(server_address, handler_class, handlers=[
{
"pattern":["/.*"],
"handler": SimpleHandler(),
"name": "default",
"weight": 10
},
{
"pattern":["/::.*"],
"handler": StaticResourcesHandler(),
"name": "__static_rc",
"weight": 0
}
], srv_path = srv_path)
httpd.serve_forever()
def configure_parser():
parser = ArgumentParser(description="srv (serve) - Python web server")
parser.add_argument("-p","--port", default="8000", type=int,
required=False, dest="port",
help="Server HTTP port. Server will bind to this port.")
parser.add_argument("-d", "--directory", default=".", required=False,
dest="directory",
help="Base directory. Srv will serve the content of this directory. Analogous to document root in Apache.")
parser.add_argument("-v","--verbose", required=False, help="Print more messages (be verbose).")
return parser
# base64 encoded ZIP file of the templates dir and other initial resources
_INITIAL_RC = """
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# -- end of Base 64 string resource
_DEFAULT_RC_LOADER = ZipLoader([BytesIO(base64.b64decode(_INITIAL_RC.encode()))])
def start_server():
ps = configure_parser()
args = ps.parse_args()
argv = vars(args)
print(" :: starting server")
print(" :: server port: %d" % argv['port'])
print(" :: server directory: %s" % argv['directory'])
try:
run_server(server_class=DispatcherHTTPServer,
handler_class=DispatcherHTTPHandler,
port=argv['port'],
address='',
srv_path=argv['directory'])
except KeyboardInterrupt:
print(" :: server shutdown requested")
print(":: server shutting down...")
if __name__ == "__main__":
start_server()