httpd.py

# Copyright 2009-2010 10gen, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.



try:
    from OpenSSL import SSL
except ImportError:
    pass

try:
    import json
except ImportError:
    import simplejson as json

import os.path, socket
import cgi
import getopt
import sys
import logging
from urllib.parse import urlparse
from socketserver import BaseServer
from http.server import BaseHTTPRequestHandler, HTTPServer
from sleepymongoose.handlers import MongoHandler



class MongoServer(HTTPServer):

    pem = None

    def __init__(self, server_address, HandlerClass):
        BaseServer.__init__(self, server_address, HandlerClass)
        ctx = SSL.Context(SSL.SSLv23_METHOD)

        fpem = MongoServer.pem
        ctx.use_privatekey_file(fpem)
        ctx.use_certificate_file(fpem)
        
        self.socket = SSL.Connection(ctx, socket.socket(self.address_family,
                                                        self.socket_type))
        self.server_bind()
        self.server_activate()


class MongoHTTPRequest(BaseHTTPRequestHandler):

    mimetypes = { "html" : "text/html",
                  "htm" : "text/html",
                  "gif" : "image/gif",
                  "jpg" : "image/jpeg",
                  "png" : "image/png",
                  "json" : "application/json",
                  "css" : "text/css",
                  "js" : "text/javascript",
                  "ico" : "image/vnd.microsoft.icon" }

    docroot = "."
    mongos = []
    response_headers = []
    jsonp_callback = None;

    def _parse_call(self, uri):
        """ 
        this turns a uri like: /foo/bar/_query into properties: using the db 
        foo, the collection bar, executing a query.

        returns the database, collection, and action
        """
        parts = uri.split('/')

        # operations always start with _
        if parts[-1][0] != '_':
            return (None, None, None)

        if len(parts) == 1:
            return ("admin", None, parts[0])
        elif len(parts) == 2:
            return (parts[0], None, parts[1])
        else:
            return (parts[0], ".".join(parts[1:-1]), parts[-1])


    def call_handler(self, uri, args):
        """ execute something """

        (db, collection, func_name) = self._parse_call(uri)
        if db == None or func_name == None:
            self.send_error(404, 'Script Not Found: '+uri)
            return

        name = None
        if "name" in args:
            if type(args).__name__ == "dict":
                name = args["name"][0]
            else:
                name = args.getvalue("name")

        self.jsonp_callback = None
        if "callback" in args:
            if type(args).__name__ == "dict":
                self.jsonp_callback = args["callback"][0]
            else:
                self.jsonp_callback = args.getvalue("callback")
                
        func = getattr(MongoHandler.mh, func_name, None)
        if callable(func):
            self.send_response(200, 'OK')
            self.send_header('Content-type', MongoHTTPRequest.mimetypes['json'])
            for header in self.response_headers:
                self.send_header(header[0], header[1])
            self.end_headers()

            if self.jsonp_callback:
                func(args, self.prependJSONPCallback, name = name, db = db, collection = collection)
            else:
                func(args, self.wfile.write, name = name, db = db, collection = collection)

            return
        else:
            self.send_error(404, 'Script Not Found: '+uri)
            return            
        
    def prependJSONPCallback(self, str):
        jsonp_output = '%s(' % self.jsonp_callback + str + ')'
        self.wfile.write( jsonp_output )
        
    # TODO: check for ..s
    def process_uri(self, method):
        if method == "GET":
            (uri, q, args) = self.path.partition('?')
        else:
            uri = self.path
            if 'Content-Type' in self.headers:
                args = cgi.FieldStorage(fp=self.rfile, headers=self.headers,
                                        environ={'REQUEST_METHOD':'POST',
                                                 'CONTENT_TYPE':self.headers['Content-Type']})
            else:
                self.send_response(100, "Continue")
                self.send_header('Content-type', MongoHTTPRequest.mimetypes['json'])
                for header in self.response_headers:
                    self.send_header(header[0], header[1])
                self.end_headers()
                self.wfile.write('{"ok" : 0, "errmsg" : "100-continue msgs not handled yet"}')

                return (None, None, None)


        uri = uri.strip('/')

        # default "/" to "/index.html"
        if len(uri) == 0:
            uri = "index.html"

        (temp, dot, type) = uri.rpartition('.')
        # if we have a collection name with a dot, don't use that dot for type
        if len(dot) == 0 or uri.find('/') != -1:
            type = ""

        return (uri, args, type)


    def do_GET(self):        
        (uri, args, type) = self.process_uri("GET")

 
        # serve up a plain file
        if len(type) != 0:
            if type in MongoHTTPRequest.mimetypes and os.path.exists(MongoHTTPRequest.docroot+uri):

                fh = open(MongoHTTPRequest.docroot+uri, 'r')

                self.send_response(200, 'OK')
                self.send_header('Content-type', MongoHTTPRequest.mimetypes[type])
                for header in self.response_headers:
                    self.send_header(header[0], header[1])
                self.end_headers()
                self.wfile.write(fh.read())

                fh.close()

                return

            else:
                self.send_error(404, 'File Not Found: '+uri)

                return

        # make sure args is an array of tuples
        if len(args) != 0:
            args = urlparse.parse_qs(args)
        else:
            args = {}

        self.call_handler(uri, args)
        #self.wfile.write( self.path )

    def do_POST(self):
        (uri, args, type) = self.process_uri("POST")
        if uri == None:
            return
        self.call_handler(uri, args)

    @staticmethod
    def serve_forever(port):
        logging.info("\n=================================")
        logging.info("|      MongoDB REST Server      |")
        logging.info("=================================\n")

        if MongoServer.pem == None:
            try:
                server = HTTPServer(('', port), MongoHTTPRequest)
            except socket.error as e:
                if e.errno == 98:
                    logging.info("could not bind to localhost:%d... is sleepy.mongoose already running?\n" % port)
                else:
                    logging.info(e.strerror)
                return
        else:
            print("--------Secure Connection--------\n")
            server = MongoServer(('', port), MongoHTTPSRequest)

        MongoHandler.mh = MongoHandler(MongoHTTPRequest.mongos)
        
        logging.info("listening for connections on http://localhost:27080\n")
        try:
            server.serve_forever()
        except KeyboardInterrupt:
            logging.info("\nShutting down the server...")
            server.socket.close()
            logging.info("\nGood bye!\n")


class MongoHTTPSRequest(MongoHTTPRequest):
    def setup(self):
        self.connection = self.request
        self.rfile = socket._fileobject(self.request, "rb", self.rbufsize)
        self.wfile = socket._fileobject(self.request, "wb", self.wbufsize)


def usage():
    logging.info("python httpd.py [-x] [-d docroot/dir] [-s certificate.pem] [-m list,of,mongods]")
    logging.info("\t-x|--xorigin\tAllow cross-origin http requests")
    logging.info("\t-d|--docroot\tlocation from which to load files")
    logging.info("\t-s|--secure\tlocation of .pem file if ssl is desired")
    logging.info("\t-m|--mongos\tcomma-separated list of mongo servers to connect to")


def main():
    try:
        opts, args = getopt.getopt(sys.argv[1:], "xd:s:m:", ["xorigin", "docroot=",
            "secure=", "mongos="])

        for o, a in opts:
            if o == "-d" or o == "--docroot":
                if not a.endswith('/'):
                    a = a+'/'
                MongoHTTPRequest.docroot = a
            if o == "-s" or o == "--secure":
                MongoServer.pem = a
            if o == "-m" or o == "--mongos":
                MongoHTTPRequest.mongos = a.split(',')
            if o == "-x" or o == "--xorigin":
                MongoHTTPRequest.response_headers.append(("Access-Control-Allow-Origin","*"))

    except getopt.GetoptError:
        logging.info("error parsing cmd line args.")
        usage()
        sys.exit(2)

    MongoHTTPRequest.serve_forever(27080)
if __name__ == "__main__":
    main()