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# Licensed under the MIT license 

# http://opensource.org/licenses/mit-license.php 

 

import xml.etree.ElementTree as ET 

# Copyright (C) 2006 Fluendo, S.A. (www.fluendo.com). 

# Copyright 2006, Frank Scholz <coherence@beebits.net> 

from urllib.parse import urlsplit, urlparse 

 

from twisted.internet import reactor, defer, abstract 

from twisted.python import failure 

from twisted.web import client 

from twisted.web import http, static 

from twisted.web import proxy, resource, server 

 

from coherence import SERVER_ID 

from coherence import log 

 

logger = log.get_logger('utils') 

 

try: 

    from twisted.protocols._c_urlarg import unquote 

except ImportError: 

    from urllib.parse import unquote 

 

try: 

    import netifaces 

 

    have_netifaces = True 

except ImportError: 

    have_netifaces = False 

 

 

def means_true(value): 

    if isinstance(value, str): 

        value = value.lower() 

    return value in [True, 1, '1', 'true', 'yes', 'ok'] 

 

 

def generalise_boolean(value): 

    """ standardize the different boolean incarnations 

 

        transform anything that looks like a "True" into a '1', 

        and everything else into a '0' 

    """ 

    if means_true(value): 

        return '1' 

    return '0' 

 

 

generalize_boolean = generalise_boolean 

 

 

def parse_xml(data, encoding="utf-8", dump_invalid_data=False): 

    parser = ET.XMLParser() 

 

    # my version of twisted.web returns page_infos as a dictionary in 

    # the second item of the data list 

    # :fixme: This must be handled where twisted.web is fetching the data 

    if isinstance(data, (list, tuple)): 

        data = data[0] 

 

    try: 

        data = data.encode(encoding) 

    except UnicodeDecodeError: 

        pass 

 

    # Guess from who we're getting this? 

    data = data.replace(b'\x00', b'') 

    try: 

        parser.feed(data) 

    except Exception as error: 

        if dump_invalid_data: 

            print(error, repr(data)) 

        parser.close() 

        raise 

    else: 

        return ET.ElementTree(parser.close()) 

 

 

def parse_http_response(data): 

    """ don't try to get the body, there are reponses without """ 

    if isinstance(data, bytes): 

        data = data.decode('utf-8') 

    header = data.split('\r\n\r\n')[0] 

 

    lines = header.split('\r\n') 

    cmd = lines[0].split(' ') 

    lines = [x.replace(': ', ':', 1) for x in lines[1:]] 

    lines = [x for x in lines if len(x) > 0] 

 

    headers = [x.split(':', 1) for x in lines] 

    headers = dict([(x[0].lower(), x[1]) for x in headers]) 

 

    return cmd, headers 

 

 

def get_ip_address(ifname): 

    """ 

    determine the IP address by interface name 

 

    http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/439094 

    (c) Paul Cannon 

    Uses the Linux SIOCGIFADDR ioctl to find the IP address associated 

    with a network interface, given the name of that interface, e.g. "eth0". 

    The address is returned as a string containing a dotted quad. 

 

    Updated to work on BSD. OpenBSD and OSX share the same value for 

    SIOCGIFADDR, and its likely that other BSDs do too. 

 

    Updated to work on Windows, 

    using the optional Python module netifaces 

    http://alastairs-place.net/netifaces/ 

 

    Thx Lawrence for that patch! 

    """ 

 

    if have_netifaces: 

        if ifname in netifaces.interfaces(): 

            iface = netifaces.ifaddresses(ifname) 

            ifaceadr = iface[netifaces.AF_INET] 

            # we now have a list of address dictionaries, 

            # there may be multiple addresses bound 

            return ifaceadr[0]['addr'] 

    import sys 

    if sys.platform in ('win32', 'sunos5'): 

        return '127.0.0.1' 

 

    from os import uname 

    import socket 

    import fcntl 

    import struct 

 

    system_type = uname()[0] 

    if system_type == "Linux": 

        SIOCGIFADDR = 0x8915 

    else: 

        SIOCGIFADDR = 0xc0206921 

 

    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 

    try: 

        ip = socket.inet_ntoa(fcntl.ioctl( 

            s.fileno(), 

            SIOCGIFADDR, 

            struct.pack(b'256s', ifname[:15].encode('ascii')) 

        )[20:24]) 

    except Exception: 

        ip = '127.0.0.1' 

    # print('ip is: {}'.format(ip)) 

    return ip 

 

 

def get_host_address(): 

    """ try to get determine the interface used for 

        the default route, as this is most likely 

        the interface we should bind to (on a single homed host!) 

    """ 

 

    import sys 

    if sys.platform == 'win32': 

        if have_netifaces: 

            interfaces = netifaces.interfaces() 

            if len(interfaces): 

                # on windows assume first interface is primary 

                return get_ip_address(interfaces[0]) 

    else: 

        try: 

            route_file = '/proc/net/route' 

            route = open(route_file) 

            if route: 

                tmp = route.readline()  # skip first line 

                while tmp != '': 

                    tmp = route.readline() 

                    li = tmp.split('\t') 

                    if (len(li) > 2): 

                        if li[1] == '00000000':  # default route... 

                            route.close() 

                            return get_ip_address(li[0]) 

        except IOError as msg: 

            """ fallback to parsing the output of netstat """ 

            from twisted.internet import utils 

 

            def result(r): 

                from os import uname 

                (osname, _, _, _, _) = uname() 

                osname = osname.lower() 

                lines = r.split('\n') 

                for li in lines: 

                    li = li.strip(' \r\n') 

                    parts = [x.strip() for x in li.split(' ') if len(x) > 0] 

                    if parts[0] in ('0.0.0.0', 'default'): 

                        if osname[:6] == 'darwin': 

                            return get_ip_address(parts[5]) 

                        else: 

                            return get_ip_address(parts[-1]) 

                return '127.0.0.1' 

 

            def fail(f): 

                return '127.0.0.1' 

 

            d = utils.getProcessOutput('netstat', ['-rn']) 

            d.addCallback(result) 

            d.addErrback(fail) 

            return d 

        except Exception as msg: 

            import traceback 

            traceback.print_exc() 

 

    """ return localhost if we haven't found anything """ 

    return '127.0.0.1' 

 

 

def de_chunk_payload(response): 

    import io 

    """ This method takes a chunked HTTP data object and unchunks it.""" 

    newresponse = io.StringIO() 

    # chunked encoding consists of a bunch of lines with 

    # a length in hex followed by a data chunk and a CRLF pair. 

    response = io.StringIO(response) 

 

    def read_chunk_length(): 

        line = response.readline() 

        try: 

            len = int(line.strip(), 16) 

        except ValueError: 

            len = 0 

        return len 

 

    len = read_chunk_length() 

    while (len > 0): 

        newresponse.write(response.read(len)) 

        line = response.readline()  # after chunk and before next chunk length 

        len = read_chunk_length() 

 

    return newresponse.getvalue() 

 

 

class Request(server.Request): 

 

    def process(self): 

        "Process a request." 

 

        # get site from channel 

        self.site = self.channel.site 

 

        # set various default headers 

        self.setHeader(b'server', SERVER_ID.encode('ascii')) 

        self.setHeader(b'date', http.datetimeToString()) 

        self.setHeader(b'content-type', b"text/html") 

 

        # Resource Identification 

        url = self.path 

        if isinstance(url, bytes): 

            url = url.decode('utf-8') 

 

        # remove trailing "/", if ever 

        url = url.rstrip('/') 

 

        scheme, netloc, path, query, fragment = urlsplit(url) 

        clean_path = path[1:] 

        self.prepath = [] 

        if path == "": 

            self.postpath = [] 

        else: 

            raw_p = list(map(unquote, clean_path.split('/'))) 

            self.postpath = list(i.encode('ascii') for i in raw_p) 

        try: 

            def deferred_rendering(r): 

                if isinstance(r, str): 

                    r = r.encode('ascii') 

                self.render(r) 

 

            resrc = self.site.getResourceFor(self) 

            if resrc is None: 

                self.setResponseCode( 

                    http.NOT_FOUND, 

                    "Error: No resource for path {}".format( 

                        path).encode('ascii')) 

                self.finish() 

            elif isinstance(resrc, defer.Deferred): 

                resrc.addCallback(deferred_rendering) 

                resrc.addErrback(self.processingFailed) 

            else: 

                if isinstance(resrc, str): 

                    resrc = resrc.encode('ascii') 

                self.render(resrc) 

 

        except Exception as e: 

            logger.error('Error on render Request: {}'.format(e)) 

            self.processingFailed(failure.Failure()) 

 

 

class Site(server.Site): 

    noisy = False 

    requestFactory = Request 

 

    def startFactory(self): 

        pass 

        # http._logDateTimeStart() 

 

 

class ProxyClient(proxy.ProxyClient, log.LogAble): 

 

    def __init__(self, command, rest, version, headers, data, father): 

        log.LogAble.__init__(self) 

        # headers["connection"] = "close" 

        self.send_data = 0 

        proxy.ProxyClient.__init__(self, command, rest, version, 

                                   headers, data, father) 

 

    def handleStatus(self, version, code, message): 

        if message: 

            # Add a whitespace to message, this allows empty messages 

            # transparently 

            message = " %s" % (message,) 

        if version == 'ICY': 

            version = 'HTTP/1.1' 

        proxy.ProxyClient.handleStatus(self, version, code, message) 

 

    def handleHeader(self, key, value): 

        if not key.startswith('icy-'): 

            proxy.ProxyClient.handleHeader(self, key, value) 

 

    def handleResponsePart(self, buffer): 

        self.send_data += len(buffer) 

        proxy.ProxyClient.handleResponsePart(self, buffer) 

 

 

class ProxyClientFactory(proxy.ProxyClientFactory): 

    # :fixme: Why here proxy.ProxyClient is used instad of our own 

    # ProxyClent? Is out ProxyClient used at all? 

    protocol = proxy.ProxyClient 

 

 

class ReverseProxyResource(proxy.ReverseProxyResource): 

    """ 

    Resource that renders the results gotten from another server 

 

    Put this resource in the tree to cause everything below it to be relayed 

    to a different server. 

 

    @ivar proxyClientFactoryClass: a proxy client factory class, used to create 

        new connections. 

    @type proxyClientFactoryClass: L{ClientFactory} 

 

    @ivar reactor: the reactor used to create connections. 

    @type reactor: object providing L{twisted.internet.interfaces.IReactorTCP} 

    """ 

 

    proxyClientFactoryClass = ProxyClientFactory 

 

    def __init__(self, host, port, path, reactor=reactor): 

        """ 

        @param host: the host of the web server to proxy. 

        @type host: C{str} 

 

        @param port: the port of the web server to proxy. 

        @type port: C{port} 

 

        @param path: the base path to fetch data from. Note that you shouldn't 

            put any trailing slashes in it, it will be added automatically in 

            request. For example, if you put B{/foo}, a request on B{/bar} will 

            be proxied to B{/foo/bar}. 

        @type path: C{str} 

        """ 

        resource.Resource.__init__(self) 

        self.host = host 

        self.port = port 

        self.path = path 

        self.qs = '' 

        self.reactor = reactor 

 

    def getChild(self, path, request): 

        return ReverseProxyResource( 

            self.host, self.port, self.path + '/' + path) 

 

    def render(self, request): 

        """ 

        Render a request by forwarding it to the proxied server. 

        """ 

        # RFC 2616 tells us that we can omit the port if it's the default port, 

        # but we have to provide it otherwise 

        if self.port == 80: 

            request.received_headers['host'] = self.host 

        else: 

            request.received_headers['host'] = "%s:%d" % (self.host, self.port) 

        request.content.seek(0, 0) 

        qs = urlparse(request.uri)[4] 

        if qs == '': 

            qs = self.qs 

        if qs: 

            rest = self.path + '?' + qs 

        else: 

            rest = self.path 

        clientFactory = self.proxyClientFactoryClass( 

            request.method, rest, request.clientproto, 

            request.getAllHeaders(), request.content.read(), request) 

        self.reactor.connectTCP(self.host, self.port, clientFactory) 

        return server.NOT_DONE_YET 

 

    def resetTarget(self, host, port, path, qs=''): 

        self.host = host 

        self.port = port 

        self.path = path 

        self.qs = qs 

 

 

class ReverseProxyUriResource(ReverseProxyResource): 

    uri = None 

 

    def __init__(self, uri, reactor=reactor): 

        self.uri = uri 

        _, host_port, path, params, _ = urlsplit(uri) 

        if host_port.find(':') != -1: 

            host, port = tuple(host_port.split(':')) 

            port = int(port) 

        else: 

            host = host_port 

            port = 80 

        if path == '': 

            path = '/' 

        if params == '': 

            rest = path 

        else: 

            rest = '?'.join((path, params)) 

        ReverseProxyResource.__init__(self, host, port, rest, reactor) 

 

    def resetUri(self, uri): 

        self.uri = uri 

        _, host_port, path, params, _ = urlsplit(uri) 

        if host_port.find(':') != -1: 

            host, port = tuple(host_port.split(':')) 

            port = int(port) 

        else: 

            host = host_port 

            port = 80 

        self.resetTarget(host, port, path, params) 

 

 

# already on twisted.web since at least 8.0.0 

class myHTTPPageGetter(client.HTTPPageGetter): 

    followRedirect = True 

 

 

class HeaderAwareHTTPClientFactory(client.HTTPClientFactory): 

    protocol = myHTTPPageGetter 

    noisy = False 

 

    def buildProtocol(self, addr): 

        p = client.HTTPClientFactory.buildProtocol(self, addr) 

        p.method = self.method 

        p.followRedirect = self.followRedirect 

        return p 

 

    def page(self, page): 

        client.HTTPClientFactory.page(self, (page, self.response_headers)) 

 

 

# deprecated, do not use 

# already in twisted.web since at least 1.3.0 

HeaderAwareHTTPDownloader = client.HTTPDownloader 

 

 

def getPage(url, contextFactory=None, *args, **kwargs): 

    """ 

    Download a web page as a string. 

 

    Download a page. Return a deferred, which will callback with a 

    page (as a string) or errback with a description of the error. 

 

    See HTTPClientFactory to see what extra args can be passed. 

    """ 

    # This function is like twisted.web.client.getPage, except it uses 

    # our HeaderAwareHTTPClientFactory instead of HTTPClientFactory 

    # and sets the user agent. 

 

    url_bytes = url 

    if not isinstance(url, bytes): 

        url_bytes = url.encode('ascii') 

    if args is None: 

        args = [] 

    if kwargs is None: 

        kwargs = {} 

 

    if 'headers' in kwargs and 'user-agent' in kwargs['headers']: 

        kwargs['agent'] = kwargs['headers']['user-agent'] 

    elif 'agent' not in kwargs: 

        kwargs['agent'] = "Coherence PageGetter" 

    new_kwargs = {} 

    for k, v in kwargs.items(): 

        if k == 'headers': 

            new_kwargs[k] = {} 

            for kh, vh in kwargs['headers'].items(): 

                h_key = kh if isinstance(kh, bytes) else kh.encode('ascii') 

                h_val = vh if isinstance(kh, bytes) else vh.encode('ascii') 

                new_kwargs['headers'][h_key] = h_val 

        else: 

            new_kwargs[k] = v 

    logger.info('getPage [url]: {} [type: {}]'.format(url, type(url))) 

    logger.debug('\t->[args]: {} [type: {}]'.format(args, type(args))) 

    logger.debug('\t->[kwargs]: {}'.format(kwargs)) 

    logger.debug('\t->[new_kwargs]: {}]'.format(new_kwargs)) 

    return client._makeGetterFactory( 

        url_bytes, 

        HeaderAwareHTTPClientFactory, 

        contextFactory=contextFactory, 

        *args, **new_kwargs).deferred 

 

 

def downloadPage(url, file, contextFactory=None, *args, **kwargs): 

    """Download a web page to a file. 

 

    @param file: path to file on filesystem, or file-like object. 

 

    See twisted.web.client.HTTPDownloader to see what extra args can 

    be passed. 

    """ 

    url_bytes = url 

    if not isinstance(url, bytes): 

        url_bytes = url.encode('ascii') 

 

    if 'headers' in kwargs and 'user-agent' in kwargs['headers']: 

        kwargs['agent'] = kwargs['headers']['user-agent'] 

    elif 'agent' not in kwargs: 

        kwargs['agent'] = "Coherence PageGetter" 

    new_kwargs = {} 

    for k, v in kwargs.items(): 

        if k == 'headers': 

            new_kwargs[k] = {} 

            for kh, vh in kwargs['headers'].items(): 

                h_key = kh if isinstance(kh, bytes) else kh.encode('ascii') 

                h_val = vh if isinstance(kh, bytes) else vh.encode('ascii') 

                new_kwargs['headers'][h_key] = h_val 

        else: 

            new_kwargs[k] = v 

    logger.info('downloadPage [url]: {} [type: {}]'.format(url, type(url))) 

    logger.debug('\t->[args]: {} [type: {}]'.format(args, type(args))) 

    logger.debug('\t->[kwargs]: {}'.format(kwargs)) 

    logger.debug('\t->[new_kwargs]: {}]'.format(new_kwargs)) 

    return client.downloadPage( 

        url_bytes, file, contextFactory=contextFactory, 

        *args, **new_kwargs) 

 

 

# StaticFile used to be a patched version of static.File. The later 

# was fixed in TwistedWeb 8.2.0 and 9.0.0, while the patched variant 

# contained deprecated and removed code. 

StaticFile = static.File 

 

 

class BufferFile(static.File): 

    """ taken from twisted.web.static and modified 

        accordingly to the patch by John-Mark Gurney 

        http://resnet.uoregon.edu/~gurney_j/jmpc/dist/twisted.web.static.patch 

    """ 

 

    def __init__(self, path, target_size=0, *args): 

        static.File.__init__(self, path, *args) 

        self.target_size = target_size 

        self.upnp_retry = None 

 

    def render(self, request): 

        # print "" 

        # print "BufferFile", request 

 

        # FIXME detect when request is REALLY finished 

        if request is None or request.finished: 

            logger.info("No request to render!") 

            return '' 

 

        """You know what you doing.""" 

        self.restat() 

 

        if self.type is None: 

            self.type, self.encoding = static.getTypeAndEncoding( 

                self.basename(), 

                self.contentTypes, 

                self.contentEncodings, 

                self.defaultType) 

 

        if not self.exists(): 

            return self.childNotFound.render(request) 

 

        if self.isdir(): 

            return self.redirect(request) 

 

        # for content-length 

        if (self.target_size > 0): 

            fsize = size = int(self.target_size) 

        else: 

            fsize = size = int(self.getFileSize()) 

 

        # print fsize 

 

        if size == int(self.getFileSize()): 

            request.setHeader(b'accept-ranges', b'bytes') 

 

        if self.type: 

            request.setHeader( 

                b'content-type', self.type if isinstance( 

                    self.type, bytes) else self.type.encode('ascii')) 

        if self.encoding: 

            request.setHeader( 

                b'content-encoding', self.encoding if isinstance( 

                    self.encoding, bytes) else self.encoding.encode('ascii')) 

 

        try: 

            f = self.openForReading() 

        except IOError as e: 

            import errno 

            if e.errno == errno.EACCES: 

                return resource.ForbiddenResource().render(request) 

            else: 

                raise 

        if request.setLastModified(self.getmtime()) is http.CACHED: 

            return '' 

        trans = True 

 

        range = request.getHeader('range') 

        # print "StaticFile", range 

 

        tsize = size 

        if range is not None: 

            # This is a request for partial data... 

            bytesrange = range.split('=') 

            assert bytesrange[0] == 'bytes', \ 

                "Syntactically invalid http range header!" 

            start, end = bytesrange[1].split('-', 1) 

            if start: 

                start = int(start) 

                # Are we requesting something 

                # beyond the current size of the file? 

                if (start >= self.getFileSize()): 

                    # Retry later! 

                    logger.info(bytesrange) 

                    logger.info( 

                        "Requesting data beyond current scope -> " 

                        "postpone rendering!") 

                    self.upnp_retry = reactor.callLater( 

                        1.0, self.render, request) 

                    return server.NOT_DONE_YET 

 

                f.seek(start) 

                if end: 

                    # print(":%s" % end) 

                    end = int(end) 

                else: 

                    end = size - 1 

            else: 

                lastbytes = int(end) 

                if size < lastbytes: 

                    lastbytes = size 

                start = size - lastbytes 

                f.seek(start) 

                fsize = lastbytes 

                end = size - 1 

            size = end + 1 

            fsize = end - int(start) + 1 

            # start is the byte offset to begin, and end is the byte offset 

            # to end..  fsize is size to send, tsize is the real size of 

            # the file, and size is the byte position to stop sending. 

            if fsize <= 0: 

                request.setResponseCode(http.REQUESTED_RANGE_NOT_SATISFIABLE) 

                fsize = tsize 

                trans = False 

            else: 

                request.setResponseCode(http.PARTIAL_CONTENT) 

                request.setHeader(b'content-range', ("bytes %s-%s/%s " % ( 

                    str(start), str(end), str(tsize))).encode('ascii')) 

                # print "StaticFile", start, end, tsize 

 

        request.setHeader('content-length', str(fsize)) 

 

        if request.method == b'HEAD' or trans is False: 

            # pretend we're a HEAD request, so content-length 

            # won't be overwritten. 

            request.method = b'HEAD' 

            return '' 

        # print "StaticFile out", request.headers, request.code 

 

        # return data 

        # size is the byte position to stop sending, not how many bytes to send 

 

        BufferFileTransfer(f, size - f.tell(), request) 

        # and make sure the connection doesn't get closed 

        return server.NOT_DONE_YET 

 

 

class BufferFileTransfer(object): 

    """ 

    A class to represent the transfer of a file over the network. 

    """ 

    request = None 

 

    def __init__(self, file, size, request): 

        self.file = file 

        self.size = size 

        self.request = request 

        self.written = self.file.tell() 

        request.registerProducer(self, 0) 

 

    def resumeProducing(self): 

        # print "resumeProducing", self.request,self.size,self.written 

        if not self.request: 

            return 

        data = self.file.read( 

            min(abstract.FileDescriptor.bufferSize, self.size - self.written)) 

        if data: 

            self.written += len(data) 

            # this .write will spin the reactor, calling .doWrite and then 

            # .resumeProducing again, so be prepared for a re-entrant call 

            self.request.write(data) 

        if self.request and self.file.tell() == self.size: 

            self.request.unregisterProducer() 

            self.request.finish() 

            self.request = None 

 

    def pauseProducing(self): 

        pass 

 

    def stopProducing(self): 

        # print "stopProducing",self.request 

        self.request.unregisterProducer() 

        self.file.close() 

        self.request.finish() 

        self.request = None 

 

 

from datetime import datetime, tzinfo, timedelta 

import random 

 

 

class _tz(tzinfo): 

    def utcoffset(self, dt): 

        return self._offset 

 

    def tzname(self, dt): 

        return self._name 

 

    def dst(self, dt): 

        return timedelta(0) 

 

 

class _CET(_tz): 

    _offset = timedelta(minutes=60) 

    _name = 'CET' 

 

 

class _CEST(_tz): 

    _offset = timedelta(minutes=120) 

    _name = 'CEST' 

 

 

_bdates = [datetime(1997, 2, 28, 17, 20, tzinfo=_CET()),  # Sebastian Oliver 

           datetime(1999, 9, 19, 4, 12, tzinfo=_CEST()),  # Patrick Niklas 

           datetime(2000, 9, 23, 4, 8, tzinfo=_CEST()),  # Saskia Alexa 

           datetime(2003, 7, 23, 1, 18, tzinfo=_CEST()),  # Mara Sophie 

           # you are the best! 

           ] 

 

 

def datefaker(): 

    return random.choice(_bdates) 

 

 

def cmp(x, y): 

    """ 

    Replacement for built-in function cmp that was removed in Python 3 

 

    Compare the two objects x and y and return an integer according to 

    the outcome. The return value is negative if x < y, zero if x == y 

    and strictly positive if x > y. 

    """ 

    return (x > y) - (x < y)