"""
A webserver for SPARQL
"""
__version__ = '$Id: webserver.py,v 1.10 2008/01/31 14:59:33 syosi Exp $'
import BaseHTTPServer, urllib
from cgi import parse_qs
from sys import exc_info
def sparql_handler(s):
return s
default_string = '''
Cwm SPARQL Server
The Cwm SPARQL server at %s
Enter a query here:
'''
##file_open = file
##m_types = {
## 'html': 'text/html',
## 'css': 'text/css',
## 'js': 'text/javascript',
## 'gif': 'image/gif',
## 'jpeg': 'image/jpeg'
## }
class SPARQL_request_handler(BaseHTTPServer.BaseHTTPRequestHandler):
server_version = "CWM/" + __version__[1:-1]
query_file = '/'
default = default_string % query_file
def do_GET(self):
print dict(self.headers)
try:
file, query = self.path.split('?', 1)
except ValueError:
file, query = self.path, ''
## if file[:13] == '/presentation':
## try:
## dot = file.rfind('.')
## if dot>0:
## c_type = m_types.get(file[dot+1:], 'text/plain')
## else:
## c_type = 'text/plain'
## s = file_open('/home/syosi/server_present/'+file[14:], 'r').read()
## self.send_response(200)
## self.send_header("Content-type", c_type)
## self.send_header("Content-Length", str(len(s)))
## self.end_headers()
## self.wfile.write(s)
## return
## except:
## pass
if file != self.query_file:
self.send_error(404, "File not found")
return
args = parse_qs(query)
print args
query = args.get('query', [''])[0]
if not query:
self.send_response(200)
self.send_header("Content-type", 'text/html')
self.send_header("Content-Length", str(len(self.default)))
self.end_headers()
self.wfile.write(self.default)
else:
try:
retVal, ctype= sparql_handler(query)
except:
self.send_response(400)
resp = str(exc_info()[1])
print 'error is', resp
self.send_header("Content-type", 'text/plain')
self.send_header("Content-Length", str(len(resp)))
self.end_headers()
self.wfile.write(resp)
else:
retVal = retVal.encode('utf_8')
print ctype
self.send_response(200)
self.send_header("Content-type", ctype)
self.send_header("Content-Length", str(len(retVal)))
self.end_headers()
self.wfile.write(retVal)
do_POST = do_GET
def run(server_class=BaseHTTPServer.HTTPServer,
handler_class=SPARQL_request_handler):
server_address = ('', 8000)
httpd = server_class(server_address, handler_class)
httpd.serve_forever()
if __name__ == '__main__':
run()