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# coding: utf-8
# This file is a part of VK4XMPP transport
# © simpleApps, 2014.
import xmpp
import urllib
from socket import error
from hashlib import sha1
def apply(instance, args=()):
"""
Executes instance(*args), but just return None on error occurred
"""
try:
code = instance(*args)
except Exception:
code = None
return code
isNumber = lambda obj: (not apply(int, (obj,)) is None)
def buildDataForm(form=None, type="submit", fields=[], title=None, data=[]):
"""
Provides easier method to build data forms using dict for each form object
Parameters:
form: xmpp.DataForm object
type: form type
fields: list of form objects represented as dict, e.g.
[{"var": "cool", "type": "text-single",
"desc": "my cool description", "value": "cool"}]
title: form title
data: advanced data for form. e.g. instructions (if string in the list), look at xmpp/protocol.py:1326
"""
form = form or xmpp.DataForm(type, data, title)
for key in fields:
field = form.setField(key["var"], key.get("value"),
key.get("type"), key.get("desc"), key.get("options"))
if key.has_key("payload"):
field.setPayload(key["payload"])
if key.has_key("label"):
field.setLabel(key["label"])
if key.has_key("requred"):
field.setRequired()
return form
def buildIQError(stanza, error=xmpp.ERR_FEATURE_NOT_IMPLEMENTED, text=None):
"""
Provides a way to build IQ error reply
"""
error = xmpp.Error(stanza, error, True)
if text:
tag = error.getTag("error")
if tag:
tag.setTagData("text", text)
return error
def normalizeValue(value):
"""
Normalizes boolean values from dataform replies
"""
if isNumber(value):
value = int(value)
elif value and value.lower() == "true":
value = 1
else:
value = 0
return value
def getLinkData(url, encode=True):
"""
Gets link data and ignores any exceptions
Parameters:
encode: base64 data encode
"""
try:
opener = urllib.urlopen(url)
data = opener.read()
except (Exception, error):
return ""
if data and encode:
data = data.encode("base64")
return data
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