def dynamicPNG(req):
"""serve a png image"""
#--- BEGIN TEMPLATE CODE...
try:
from mod_python import apache, util, Session
session = Session.Session(req)
form = util.FieldStorage(req, keep_blank_values=1)
req.add_common_vars()
base_url_path = req.subprocess_env['REQUEST_URI'].split(
'?', 1
)[0] #e.g. /PATH/FILENAME.psp, of 'https://SERVER/PATH/FILENAME.psp?FOO=BAR'
base_url_dir = os.path.dirname(
base_url_path
) #e.g. /PATH, of 'https://SERVER/PATH/FILENAME.psp?FOO=BAR'
base_fs_dir = os.path.dirname(req.subprocess_env['SCRIPT_FILENAME'])
msg = "request from ip [%s] from user [%s]" % (
req.subprocess_env['REMOTE_ADDR'], core.getUsername(session, req))
core.log(msg, session, req)
core.sessionCheck(session, req)
#--- ...END TEMPLATE CODE
#these are of bytes of a little plus sign png (in practice it could of course be a truly dynamically created image)
bytes = '\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x0f\x00\x00\x00\x0f\x08\x06\x00\x00\x00;\xd6\x95J\x00\x00\x00\x01sRGB\x00\xae\xce\x1c\xe9\x00\x00\x00\x06bKGD\x00\xff\x00\xff\x00\xff\xa0\xbd\xa7\x93\x00\x00\x00\tpHYs\x00\x00\x0b\x13\x00\x00\x0b\x13\x01\x00\x9a\x9c\x18\x00\x00\x00\x07tIME\x07\xdb\x03\x0e\x03\x19 \xb1z|&\x00\x00\x00\x19tEXtComment\x00Created with GIMPW\x81\x0e\x17\x00\x00\x01\\IDAT(\xcf\x95\x92=K\x03A\x10\x86\x9f\x9d\xbb\x13\xd1B\x02I\x11\xf0JI\x1f\x1b\xff\x83\xd8\xe4\x07\xd8\xa4\xb1\x11\x1b\x0b\x11\xc4N,D\xf0\xabK\x94(\xd6j\x17\xc4?\x10\xd0\xa4\x14b:\x95\x84\x88\x12lB>n\xc7"\xe4 \xf1\x848\xcd\xb2\xb3\xf3,\xef\xbc3FU\x95\x888\xbb;\xa5R+\x93\x8c%\xd9Y\xdde\xca\x9d\xfaU\xe3F\x81\x97\xf7\x05.\x8ay\xfaA\x1f\x80v\xb7\xcd\xc1\xda\xe1dp\xe3\xab\x8e#\x0e\x00\xd6Z\x9a\xadfT\x19\x12\x99\x94\xd1\xb4#29\xec\xb9\xde\xd8gN$lTU/\xef\x0b4\xbe\xea\x88\x08\x9e\xebQz.\xf1\xf2^EUQU\xe2sq\x96\x97V\xe8\xf6:(\xe0\x8a\xc3zf\x03sz{\xa2\x17\xc5|\xd8#\x80U\xcbp\x08\xaa\x8a1\xe6\xd7{za\x11\xb7R+\x87\xaeFJ3\x06\x80\xc0\x06#\xf9\xa7\xea#n2\x96\x0c]\x1d\x07\x86\xe7P\xfe0\x14\xc5O\xf8\x98N\xaf\xa3\xdb\xb9-\x9a\xad&\x8e\x08"\x0eo\x1f\xaf|~\x7f\x86\xe0\xcc\xf4,\xa9\xf9\x14\x81\xed\xa3\xaa\x88\x08{\xd9\xfd\x81a\xe3R\x8fo\x8e\xb8~\xb8"\xb0\x01\xd6\x0e\xfa\xcbm\x9eO6\xaan\xaf3r\x0fl\x7f\xf29\x8fK\xf9c\xfd\xa3aW\x1c\xac\xda\xd0\x1c\xf9\xcf\x86\xadg6H/,\x02\xe0\'|\xf6\xb2\xfb\x91\xf0\x0f\xef\xf5\x9a\xd8\xfc\x04i\x03\x00\x00\x00\x00IEND\xaeB`\x82'
req.headers_out.add('Content-Type', 'image/png')
req.write(bytes)
#almost all Exceptions should be allowed to just bubble up to the general catch-all
#if instead you want specific explanations presented to the user, you must redirect
#--- BEGIN TEMPLATE CODE...
return apache.OK
except apache.SERVER_RETURN:
##if it's re-raised, sessions start over; passing seems wrong but it's the only way I know of to make sessions persist across redirect
#raise
raise
except Exception, e:
if not ('core' in globals() and 'session' in locals()
and 'base_url_dir' in locals()):
raise #just bailout and let the server handle it (if configured with PythonDebug On, the traceback will be shown to the user)
else:
msg = "ERROR: exception when handling user [%s]: %s" % (
core.getUsername(session, req), e)
core.log(msg, session, req, e)
req.internal_redirect(
os.path.join(base_url_dir, 'exampleHandlerFailure.psp'))
return apache.OK #(not sure if this does anything)
def errmsg_general(session, req):
"""html used for general failures
Do not include a greeting or other header -- this is used for unexpected errors and may come up after a greeting has already been printed.
"""
msg = 'Please email <a href="mailto:%s">%s</a> for futher assistance, noting' % (support_email_address, support_email_address)
username = core.getUsername(session, req)
if username is not None:
msg += ' your username (<em>%s</em>) and' % username
msg += ' the time this happened (<em>%s</em>).' % time.strftime('%Y-%m-%d %H:%M:%S %Z')
return """\
%s
<p>
An error occurred while processing your request.
Sorry.
</p>
<p>
%s
</p>
""" % (err_str, msg)