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Twiml.php
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Sat, Nov 16, 01:58

Twiml.php
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<?php
/**
* Exception class for Services_Twilio_Twiml.
*/
class Services_Twilio_TwimlException extends Exception {}
/**
* Twiml response generator.
*
* Author: Neuman Vong <neuman at ashmoremusic dot com>
* License: http://creativecommons.org/licenses/MIT/ MIT
*/
class Services_Twilio_Twiml {
protected $element;
/**
* Constructs a Twiml response.
*
* :param SimpleXmlElement|array $arg: Can be any of
*
* - the element to wrap
* - attributes to add to the element
* - if null, initialize an empty element named 'Response'
*/
public function __construct($arg = null) {
switch (true) {
case $arg instanceof SimpleXmlElement:
$this->element = $arg;
break;
case $arg === null:
$this->element = new SimpleXmlElement('<Response/>');
break;
case is_array($arg):
$this->element = new SimpleXmlElement('<Response/>');
foreach ($arg as $name => $value) {
$this->element->addAttribute($name, $value);
}
break;
default:
throw new TwimlException('Invalid argument');
}
}
/**
* Converts method calls into Twiml verbs.
*
* A basic example:
*
* .. code-block:: php
*
* php> print $this->say('hello');
* <Say>hello</Say>
*
* An example with attributes:
*
* .. code-block:: php
*
* print $this->say('hello', array('voice' => 'woman'));
* <Say voice="woman">hello</Say>
*
* You could even just pass in an attributes array, omitting the noun:
*
* .. code-block:: php
*
* print $this->gather(array('timeout' => '20'));
* <Gather timeout="20"/>
*
* :param string $verb: The Twiml verb.
* :param array $args:
* - (noun string)
* - (noun string, attributes array)
* - (attributes array)
*
* :return: A SimpleXmlElement
* :rtype: SimpleXmlElement
*/
public function __call($verb, array $args)
{
list($noun, $attrs) = $args + array('', array());
if (is_array($noun)) {
list($attrs, $noun) = array($noun, '');
}
/* addChild does not escape XML, while addAttribute does. This means if
* you pass unescaped ampersands ("&") to addChild, you will generate
* an error.
*
* Some inexperienced developers will pass in unescaped ampersands, and
* we want to make their code work, by escaping the ampersands for them
* before passing the string to addChild. (with htmlentities)
*
* However other people will know what to do, and their code
* already escapes ampersands before passing them to addChild. We don't
* want to break their existing code by turning their &amp;'s into
* &amp;amp;
*
* We also want to use numeric entities, not named entities so that we
* are fully compatible with XML
*
* The following lines accomplish the desired behavior.
*/
$decoded = html_entity_decode($noun, ENT_COMPAT, 'UTF-8');
$normalized = htmlspecialchars($decoded, ENT_COMPAT, 'UTF-8', false);
$child = empty($noun)
? $this->element->addChild(ucfirst($verb))
: $this->element->addChild(ucfirst($verb), $normalized);
foreach ($attrs as $name => $value) {
/* Note that addAttribute escapes raw ampersands by default, so we
* haven't touched its implementation. So this is the matrix for
* addAttribute:
*
* & turns into &amp;
* &amp; turns into &amp;amp;
*/
if (is_bool($value)) {
$value = ($value === true) ? 'true' : 'false';
}
$child->addAttribute($name, $value);
}
return new static($child);
}
/**
* Returns the object as XML.
*
* :return: The response as an XML string
* :rtype: string
*/
public function __toString()
{
$xml = $this->element->asXml();
return str_replace(
'<?xml version="1.0"?>',
'<?xml version="1.0" encoding="UTF-8"?>', $xml);
}
}

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