Haschek-Solutions/http2pic
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Catch When cURL can't connect to webserver

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If a domain is invalid or a web server is down, cURL will return false
and not have a status code. We need to catch it and distinguish the
difference between page not found and cannot connect for the user.
This commit is contained in:
Chip Wasson 2016-08-29 21:52:28 -06:00
parent 6c1aaeae2a
commit 03b72c9198
4 changed files with 42 additions and 15 deletions
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48
http2pic.class.php
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@ -20,7 +20,8 @@
define(DEBUG,false); define(DEBUG,false);
define(MAXTIMEOUT,30); define(MAXTIMEOUT,30);
define(ONFAILIMAGE,'https://http2pic.haschek.at/img/failed.jpg'); define(ONFAILIMAGE, __DIR__.'/img/pagefailed.jpg');
define(ONDOMAINFAILIMAGE, __DIR__.'/img/domainfailed.jpg');
//rendering engine: wkhtmltoimage or phantomjs //rendering engine: wkhtmltoimage or phantomjs
define(RENDERINGENGINE,'wkhtmltoimage'); define(RENDERINGENGINE,'wkhtmltoimage');
@ -94,6 +95,11 @@ class http2pic
$this->params['onfail'] = ONFAILIMAGE; $this->params['onfail'] = ONFAILIMAGE;
else else
$this->params['onfail'] = rawurldecode($this->params['onfail']); $this->params['onfail'] = rawurldecode($this->params['onfail']);
if(!$this->params['ondomainfail'])
$this->params['ondomainfail'] = ONDOMAINFAILIMAGE;
else
$this->params['ondomainfail'] = rawurldecode($this->params['ondomainfail']);
//validate URL and check if exists //validate URL and check if exists
@ -103,10 +109,20 @@ class http2pic
$this->params['url'] = rawurldecode($_GET['url']); $this->params['url'] = rawurldecode($_GET['url']);
//if the url is not valid or not responding, show onfail image and leave //if the url is not valid or not responding, show onfail image and leave
if(!$this->isURLValid($this->params['url']) || !$this->isURLReachable($this->params['url'])) if(!$this->isURLValid($this->params['url']) || !(($reachableResult = $this->isURLReachable($this->params['url'])) == 0))
{ {
header('Content-Type: image/jpeg'); header('Content-Type: image/jpeg');
$result = imagecreatefromjpeg($this->params['onfail']); header('Content-Disposition: inline; filename="http2png.jpg"');
switch ($reachableResult) {
case 1:
header('HTTP/1.0 404 File Not Found');
$result = imagecreatefromjpeg($this->params['onfail']);
break;
case 2:
header('HTTP/1.0 404 Server Not Found');
$result = imagecreatefromjpeg($this->params['ondomainfail']);
break;
}
imagejpeg($result, NULL, 100); imagejpeg($result, NULL, 100);
return false; return false;
} }
@ -283,16 +299,22 @@ class http2pic
{ {
$ch = curl_init($url); $ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_exec($ch); if(curl_exec($ch) != false){
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE); //We were able to connect to a webserver, what did it return?
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if($code < 400) //status code updated so redirects will also work
$status = true; if($code < 400) //status code updated so redirects will also work
else $status = 0;
$status = false; else
$status = 1;
curl_close($ch); curl_close($ch);
return $status; return $status;
} else {
//We were not able to connect to any webserver so we didn't get a status code
//to compare against. There must be a problem with the domain that was supplied.
curl_close($ch);
return 2;
}
} }
function trimToAlphaNumeric($string) function trimToAlphaNumeric($string)

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9
index.php
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@ -124,9 +124,14 @@ define('CONN', (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] == "")?'http':'ht
<td>onfail</td> <td>onfail</td>
<td>[url of .jpg]</td> <td>[url of .jpg]</td>
<td>If the page can't be reached, this image will be displayed instead</td> <td>If the page can't be reached, this image will be displayed instead</td>
<td><?php echo CONN; ?>://<?php echo DOMAIN; ?>/img/failed.jpg</td> <td><?php echo CONN; ?>://<?php echo DOMAIN; ?>/img/pagefailed.jpg</td>
</tr>
<tr>
<td>ondomainfail</td>
<td>[url of .jpg]</td>
<td>If the web server can't be reached, this image will be displayed instead</td>
<td><?php echo CONN; ?>://<?php echo DOMAIN; ?>/img/domainfailed.jpg</td>
</tr> </tr>
<tr> <tr>
<td>cache</td> <td>cache</td>
<td>[any alphanumeric string]</td> <td>[any alphanumeric string]</td>