So I don’t know why this one took me this long to find, but I spent a long time today trying to figure out why my PHP script wasn’t uploading my file I wanted to slack. I had the string to send to slack correct, but every time I tried I was getting a no_file_content error.
I was using the, apparently now, old method of referencing a file for POST-back. That is $file = '@/path/to/file.png'
Here is the new method, in case any one else had as much trouble as I did finding it $file = new CurlFile('filename.png', 'image/png');
Here is the PHP wiki article on the “new” method
And here it is, in action
<?php
$slacktoken = "longthingwithlotsofletters";
$header = array();
$header[] = 'Content-Type: multipart/form-data';
$file = new CurlFile('/home/john/myphoto.jpg', 'image/jpg');
$postitems = array(
'token' => $slacktoken,
'file' => $file,
'text' => "This is my photo",
'title' => "Why this?",
'filename' => "my-photo.jpg"
);
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
curl_setopt($curl, CURLOPT_URL, "https://slack.com/api/files.upload");
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS,$postitems);
//Execute curl and store in variable
$data = curl_exec($curl);
?>
Yay now I can upload files from PHP