Post.php

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<?php

class CAS_ProxiedService_Http_Post extends CAS_ProxiedService_Http_Abstract
{

    private $_contentType;

    private $_body;

    public function setContentType($contentType)
    {
        if ($this->hasBeenSent()) {
            throw new CAS_OutOfSequenceException(
                'Cannot set the content type, request already sent.'
            );
        }

        $this->_contentType = $contentType;
    }

    public function setBody($body)
    {
        if ($this->hasBeenSent()) {
            throw new CAS_OutOfSequenceException(
                'Cannot set the body, request already sent.'
            );
        }

        $this->_body = $body;
    }

    protected function populateRequest(CAS_Request_RequestInterface $request)
    {
        if (empty($this->_contentType) && !empty($this->_body)) {
            throw new CAS_ProxiedService_Exception(
                "If you pass a POST body, you must specify a content type via "
                . get_class($this) . '->setContentType($contentType).'
            );
        }

        $request->makePost();
        if (!empty($this->_body)) {
            $request->addHeader('Content-Type: ' . $this->_contentType);
            $request->addHeader('Content-Length: ' . strlen($this->_body));
            $request->setPostBody($this->_body);
        }
    }
}