utils.py

"""
Taken from:  https://gist.github.com/1094140
"""

from functools import wraps
from flask import request, current_app

def safe_url_for(rule):
    defaults = rule.defaults if rule.defaults is not None else ()
    arguments = rule.arguments if rule.arguments is not None else ()
    return len(defaults) >= len(arguments)

def jsonp(func):
    """Wraps JSONified output for JSONP requests."""
    @wraps(func)
    def decorated_function(*args, **kwargs):
        callback = request.args.get('callback', False)
        if callback:
            data = str(func(*args, **kwargs).data)
            content = str(callback) + '(' + data + ')'
            mimetype = 'application/javascript'
            return current_app.response_class(content, mimetype=mimetype)
        else:
            return func(*args, **kwargs)
    return decorated_function