Slack Incoming Webhook script for lolcommits plugin "uploldz"

slack.php

<?php
	
/***************************************************************************************************
 *
 *	Step 1: Save the sent file locally on the server   
 *    
 */
$file_name = basename($_FILES["file"]["name"]);
$target_file = "images/".basename($_FILES["file"]["name"]);
if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
	
    // Pull the information from the POST request from 'uploldz' plugin
    $repo = $_POST["repo"];
    $message = $_POST["message"];
    $author_name = $_POST["author_name"];
    $author_email = $_POST["author_email"];
    $sha = $_POST["sha"];
    $key = $_POST["key"];
    
	// Form URLs for the slack request
    $imageUrl = "http://example.com/lolcommits/".$target_file;    
    $slackUrl = "https://hooks.slack.com/services/<SLACK_INCOMING_WEBHOOK_URL>";
    
    /***************************************************************************************************
	 *
	 *	Step 2: Build the Slack Payload
	 *    
	 */
    
	// Build the message fields
    $fieldRepo["title"] = "Repository";
    $fieldRepo["value"] = $key;
    $fieldRepo["short"] = true;

    $fieldHash["title"] = "Commit";
    $fieldHash["value"] = $sha;
    $fieldHash["short"] = true;    
    
    $fields = array($fieldRepo, $fieldHash);
    $attachment["fields"] = $fields;
    
    // Build the basic metadata
    $attachment["pretext"] = "New lolcommit from ".$author_name;
    $attachment["text"] = $message;
    $attachment["title"] = $file_name;
    $attachment["color"] = "#52AADD";
    $attachment["image_url"] = $imageUrl;
    
    // Construct & Encode
    $attachments = array($attachment);
    $payload["attachments"] = $attachments;
    $postdata = json_encode($payload);
    
    /***************************************************************************************************
	 *
	 *	Step 3: Begin the POST request to slack using cURL and Slack's Incoming Webhook api's 
	 *    
	 */
    
    // Get cURL resource
	$ch = curl_init();
	
	// Set url
	curl_setopt($ch, CURLOPT_URL, $slackUrl);
	
	// Set method
	curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
	
	// Set options
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	
	// Set body
	curl_setopt($ch, CURLOPT_POST, 1);
	curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
	
	// Send the request & save response to $resp
	$resp = curl_exec($ch);
	
	if(!$resp) {
	  die('Error: "' . curl_error($ch) . '" - Code: ' . curl_errno($ch));
	} else {
	  echo "Response HTTP Status Code : " . curl_getinfo($ch, CURLINFO_HTTP_CODE);
	  echo "\nResponse HTTP Body : " . $resp;
	}
	
	// Close request to clear up some resources
	curl_close($ch);
    
} else {
    echo "Sorry, there was an error uploading your file.";
}

?>

This script simply just saves the image file to the server the script is hosted on and then serves up a link from that server to Slack. You could easily modify this script to take the image data from the request and upload it to S3 or some other image hosting service then serve a link from there to Slack.

Could you explain how I'll set it up?