slash.photo

slash.photo is a simple slash command that searches the Unsplash API from Slack.

Resources

This approach merged a number of different helpful resources.

1. Free hosting account on OpenShift
2. PHP script demonstrating how to post incoming webhooks on Slack by Alex Stone
3. Slack Integration by David Mays

Retreiving data from Slack to build a Slash Command

	function BuildSlashCommand($request)
	{
		$cmd = new stdClass();
		$cmd->Token = $request['token'];
		$cmd->TeamId = $request['team_id'];
		$cmd->team_domain = $request['team_domain'];
		$cmd->ChannelId = $request['channel_id'];
		$cmd->ChannelName = $request['channel_name'];
		$cmd->UserId = $request['user_id'];
		$cmd->UserName = $request['user_name'];
		$cmd->Command = $request['command'];
		$cmd->Text = $request['text'];
		$cmd->ResponseUrl = $request['response_url'];

		return $cmd;
	}

Searching Unsplash API

    // Build Unsplash API search
	function RunImageSearch($text)
	{
		$enc = urlencode($text);
	    $client_id = 'YOUR TOKEN';
	    $imageSearchJson = get_url_contents("https://api.unsplash.com/photos/search/?query=".$text."&client_id=".$client_id."&per_page=25");
	    $images = json_decode($imageSearchJson);

	    return $images;
	}
	
	// cURL to get the contents of search from Unsplash API
	
	function get_url_contents($url) {
	    $crl = curl_init($url);

	    curl_setopt($crl, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)');
	    curl_setopt($crl, CURLOPT_RETURNTRANSFER, 1);
	    curl_setopt($crl, CURLOPT_CONNECTTIMEOUT, 5);

	    $response = curl_exec($crl);
	    curl_close($crl);
	    return $response;
	}

Authenticate a new user of your Slack app

  // Get unique 'code' from Slack
  $code = $_REQUEST['code'];

  // Set Auth Parameters
  $auth = new stdClass;
  $auth->client_id = "YOUR CLIENT ID";
  $auth->client_secret = "YOUR CLIENT SECRET";
  $auth->code = $code;
  $auth->redirect_uri = "YOUR REDIRECT URL";
  
  // Send Authentication info to Slack
  $auth_url = "https://slack.com/api/oauth.access?client_id={$auth->client_id}&client_secret={$auth->client_secret}&code={$auth->code}&redirect_uri={$auth->redirect_uri}";
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $auth_url);
  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $result = curl_exec($ch);
  // If there is an error stop process
  if($result === false)
  {
      echo 'Curl error: ' . curl_error($ch);
      die();
  }
  curl_close($ch);
    
  // Redirect people to your web page
  header("Location: http://YOURPAGE.COM");
  exit();

API Documentation

• Unsplash: https://unsplash.com/developers

• Slack: https://api.slack.com/