""" httphelper.py - basic HTTP-related functions (c) by Michael Stroeder This module is distributed under the terms of the GPL (GNU GENERAL PUBLIC LICENSE) Version 2 (see http://www.gnu.org/copyleft/gpl.html) $Id: httphelper.py,v 1.4 2002/01/27 00:36:35 michael Exp $ """ __version__ = '0.0.3' import sys,time HTTP_LINESEP = '\r\n' def DateTimeRFC1123(secs=0): """ Return seconds as RFC1123 date/time format preferred for HTTP 1.1 (see RFC2616) """ return time.strftime( '%a, %d %b %Y %H:%M:%S GMT', time.gmtime(secs) ) # Write HTTP-Header def SendHeader( outf=sys.stdout, contenttype='text/html', charset='ISO-8859-1', contentlength=None, expires_offset=0, lastmodified=None, additional_header = {} ): """ Generate HTTP header outf File object used for sending to client. contenttype='text/html', MIME type of object in HTTP body. charset='ISO-8859-1', Character set used. contentlength=None, Content-Length if known and gzip-encoding is not used. expires_offset=0, Expiry time from current time in seconds. lastmodified=None, Last-modified time. additional_header = {} Dictionary containing arbitrary additional HTTP header fields. """ gzip = hasattr(outf,'fileobj') # Get current time as GMT (seconds since epoch) gmt = time.time() # Determine times for HTTP header if lastmodified is None: lastmodified = DateTimeRFC1123(gmt) expires = DateTimeRFC1123(gmt+expires_offset) # Build list of header lines header_lines = [] # Write header if not (contenttype is None): header_lines.append('Content-Type: %s;charset=%s' % (contenttype,charset)) if not (contentlength is None): header_lines.append('Content-Length: %d' % (contentlength)) if gzip: header_lines.append('Content-Encoding: gzip') header_lines.append('Vary: Accept-Encoding') header_lines.append('Last-Modified: %s' % (lastmodified)) header_lines.append('Expires: %s' % (expires)) for h,v in additional_header.items(): header_lines.append('%s: %s' % (h,v)) # Write empty end-of-header line header_lines.extend(['','']) if gzip: outf.fileobj.write(HTTP_LINESEP.join(header_lines)) outf.fileobj.flush() else: outf.write(HTTP_LINESEP.join(header_lines)) return def URLRedirect(outf,url,refreshtime=0,msg='Redirecting...'): """ Output HTML text with redirecting section. """ SendHeader(outf) outf.write(""" %(msg)s Redirecting... """ % vars() )