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agente.py
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agente.py
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#!/usr/bin/python
# -*- coding: latin-1 -*-
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
"Servidor local HTTP JSONP para aplicaciones web con controladores fiscales"
__author__ = "Mariano Reingart <reingart@gmail.com>"
__copyright__ = "Copyright (C) 2014 Mariano Reingart"
__license__ = "GPL 3.0"
__version__ = "1.00a"
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
import cgi
import time
import os
from controlador import ControladorFiscal
# ejemplo para http://localhost:8000 :
INDEX = """
<!doctype html>
<html>
<head>
<script src="http://localhost:8000/hola.js"></script>
<script type="text/javascript">
window.onload = function() {
function ejecutar(url) {
var s = document.createElement('script');
s.type = "text/javascript";
s.src = url;
document.body.appendChild(s);
}
ejecutar("http://localhost:8000/Conectar.js?marca=epson&modelo=epsonlx300+&puerto=COM2&callback=alert");
ejecutar("http://localhost:8000/ConsultarUltNro.js?tipo_cbte=6&callback=alert");
ejecutar("http://localhost:8000/AbrirComprobante.js?tipo_cbte=6&callback=alert");
ejecutar("http://localhost:8000/ImprimirItem.js?ds=Producto+Prueba&qty=1.00&importe=121.00&callback=alert");
ejecutar("http://localhost:8000/CerrarComprobante.js?callback=alert");
alert("terminado!");
}
</script>
</head>
<body>
<h1>Prueba JSONP</h1>
</body>
</html>
"""
class Handler(BaseHTTPRequestHandler):
def do_GET(self):
if not self.path.startswith(("/", "/hola.js")):
self.send_error(404, "File not found")
else:
if self.path == "/":
# muestro la página de ejemplo
content = INDEX
content_type = "text/html"
elif '?' in self.path:
# analizo la URL, extrayendo las variables:
path, tmp = self.path.split('?', 1)
method, ext = os.path.splitext(path[1:])
qs = cgi.parse_qs(tmp)
# obtengo la función a llamar
fn = getattr(self.server.controlador, method)
callback = qs['callback'].pop()
kwargs = dict([(k, v[0]) for k, v in qs.items() if v])
# ejecuto el método del controlador
ret = fn(**kwargs)
# reviso el valor devuelto (limpio si es excepción):
ex = self.server.controlador.Excepcion
if ex:
ex = ex.replace('"', "").replace("'", "").replace("\n", "")
if isinstance(ex, str):
ex = ex.decode("ascii", "replace")
# devuelvo JS que muestre la excepción:
content = """alert("%s");""" % (ex.encode("ascii", "replace"))
else:
if ret is None:
ret = "OK"
# devuelvo JS que llame al callback en el navegador:
content = """%s(%s);""" % (callback, repr(ret))
content_type = "application/javascript"
print content
else:
# prueba simple:
content_type = "application/javascript"
content = """alert("hola mundo %s!");""" % time.time()
# envío la respuesta (no cachear y compatibilidad con IE 8):
self.send_response(200)
self.send_header("Content-type", content_type)
self.send_header("X-UA-Compatible", "IE=8")
self.send_header("Cache-Control", "no-cache, no-store, must-revalidate")
self.send_header("Pragma", "no-cache")
self.send_header("Expires", 0)
self.end_headers()
self.wfile.write(content)
# levanto el servidor local:
server = HTTPServer(("localhost", 8000), Handler)
server.controlador = ControladorFiscal()
server.serve_forever()