My application uses Google Charts and using HTTPS. I need to display the Google Charts as "secure" images, otherwise Internet Explorer will complain about displaying insecure content. So, I am trying to download them (then link to the local file) using a Zend_Http_Client request, but I can't seem to do it.
The URI should be valid since I can click this link and view the image:
Here's the code I am using:
$chartUrl = 'http://chart.apis.google.com/chart?chs=250x150&cht=bvg&chds=0,19&chd=t:19&chxt=x,y&chxl=0:|2009&chxr=1,0,19&chf=bg,s,F2F0E1';
$client = new Zend_Http_Client($chartUrl, array('maxredirects' => 0, 'timeout' => 30));
$response = $client->request();
What am I doing wrong? Is there another way I can achieve this?
Work-around
Since the Google Chart URI uses "invalid" characters, it fails validation when constructing a Zend_Uri. This is what I had to do in order to download the Google Chart.
/**
* Returns the URL of the Google chart image that has been downloaded and stored locally. If it has not been downloaded yet, it will be download.
* @param string $chartUrl
* @return string
*/
protected function _getLocalImageUrl($chartUrl)
{
$savePath = realpath(APPLICATION_PATH . '/../public/Resources/google-charts/');
$hashedChartUrl = md5($chartUrl);
$localPath = "$savePath/$hashedChartUrl";
if (!file_exists($localPath)) {
exec("wget -O \"$localPath\" \"$chartUrl\"");
}
return "/Resources/google-charts/$hashedChartUrl";
}