Template tag for importing content from external url

Author:: dchandek
Posted:: April 23, 2008
Language:: Python
Version:: .96
Score:: 1 (after 1 ratings)

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Usage:

Literal value, use default timeout {% geturl "http://example.com/path/to/content/" %}

Variable value, literal timeout {% geturl object.urlfield 5 %}

@register.simple_tag
def geturl(url, timeout=None):
    """
    Usage: {% geturl url [timeout] %}

    Examples:
    {% geturl "http://example.com/path/to/content/" %}
    {% geturl object.urlfield 1 %} 
    """
    import socket
    from urllib2 import urlopen
    socket_default_timeout = socket.getdefaulttimeout()
    if timeout is not None:
        try:
            socket_timeout = float(timeout)
        except ValueError:
            raise template.TemplateSyntaxError, "timeout argument of geturl tag, if provided, must be convertible to a float"
        try:
            socket.setdefaulttimeout(socket_timeout)
        except ValueError:
            raise template.TemplateSyntaxError, "timeout argument of geturl tag, if provided, cannot be less than zero"
    try:
        try: 
            content = urlopen(url).read()
        finally: # reset socket timeout
            if timeout is not None:
                socket.setdefaulttimeout(socket_default_timeout) 
    except:
        content = ''        
    return content