Uncaught exception we running restful API using Slim Framework - php

Question

I want to create an API using Slim for my android application. The API is very simple, i just want to save in my database data for an article. My code is shown below
<?php
error_reporting(-1);
ini_set('display_errors', 'On');
require_once '../include/DbHandler.php';
require '.././libs/Slim/Slim.php';
\Slim\Slim::registerAutoloader();
$app = new \Slim\Slim();
/**
* Verifying required params posted or not
*/
function verifyRequiredParams($required_fields) {
$error = false;
$error_fields = "";
$request_params = array();
$request_params = $_REQUEST;
if ($_SERVER['REQUEST_METHOD'] == 'PUT') {
$app = \Slim\Slim::getInstance();
parse_str($app->request()->getBody(), $request_params);
}
foreach ($required_fields as $field) {
if (!isset($request_params[$field]) || strlen(trim($request_params[$field])) <= 0) {
$error = true;
$error_fields .= $field . ', ';
}
}
if ($error) {
$response = array();
$app = \Slim\Slim::getInstance();
$response["error"] = true;
$response["message"] = 'Required field(s) ' . substr($error_fields, 0, -2) . ' is missing or empty';
echoRespnse(400, $response);
$app->stop();
}
}
/**
* Echoing json response to client
* #param String $status_code Http response code
* #param Int $response Json response
*/
function echoRespnse($status_code, $response) {
$app = \Slim\Slim::getInstance();
$app->status($status_code);
$app->contentType('application/json');
echo json_encode($response);
}
/**
* Creating new task in db
* method POST
* params - name
* url - /articles/
*
* {"error": false,
"message": "Task created successfully",
"task_id": 1}
*/
$app->post('/articles', 'authenticate', function() use ($app) {
//verifyRequiredParams(array('article'));
$response = array();
$article_image = $app->request->post('article_image');
$article_video = $app->request->post('article_video');
$article_title = $app->request->post('article_title');
$article_main_body = $app->request->post('article_main_body');
$article_tags = $app->request->post('article_tags');
$db = new DbHandler();
// creating new article
$article_id = $db->createTask($article_image,$article_video,$article_title,$article_main_body,$article_tags);
if ($article_id != NULL) {
$response["error"] = false;
$response["message"] = "Article created successfully";
$response["article_id"] = $article_id;
} else {
$response["error"] = true;
$response["message"] = "Failed to create article. Please try again";
}
echoRespnse(201, $response);
});
/**
* Listing all articles
* method GET
* url /articles
* {
"error": false,
"tasks": [
{
"id": 1,
"task": "Complete REST article by Sunday",
"status": 0,
"createdAt": "2014-01-08 23:35:45"
},
{
"id": 2,
"task": "Book bus tickets!",
"status": 0,
"createdAt": "2014-01-08 23:56:52"
}
]
}
*/
$app->get('/articles', 'authenticate', function() {
$response = array();
$db = new DbHandler();
$result = $db->getAllTasks();
$response["error"] = false;
$response["articles"] = array();
// looping through result and preparing articles array
while ($article = $result->fetch_assoc()) {
$tmp = array();
$tmp["id"] = $task["id"];
$tmp["article_image"] = $article["article_image"];
$tmp["article_video"] = $article["article_video"];
$tmp["article_title"] = $article["article_title"];
$tmp["article_main_body"] = $article["article_main_body"];
$tmp["article_tags"] = $article["article_tags"];
$tmp["created_at"] = $article["created_at"];
array_push($response["articles"], $tmp);
}
echoRespnse(200, $response);
});
/**
* Listing single task of particual user
* method GET
* url /articles/:id
* Will return 404 if the task doesn't belongs to user
*
* {
"error": false,
"id": 2,
"task": "Book bus tickets!",
"status": 0,
"createdAt": "2014-01-08 23:56:52"
}
*/
$app->get('/articles/:id', 'authenticate', function($article_id) {
$response = array();
$db = new DbHandler();
// fetch article
$result = $db->getArticle($article_id);
if ($result != NULL) {
$response["error"] = false;
$response["id"] = $result["id"];
$response["article_image"] = $result["article_image"];
$response["article_video"] = $result["article_video"];
$response["article_title"] = $result["article_title"];
$response["article_main_body"] = $result["article_main_body"];
$response["article_tags"] = $result["article_tags"];
$response["created_at"] = $result["created_at"];
echoRespnse(200, $response);
} else {
$response["error"] = true;
$response["message"] = "The requested resource doesn't exists";
echoRespnse(404, $response);
}
});
$app->run();
?>
The above, is my index.php while my .htaccess is the below
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ %{ENV:BASE}index.php [QSA,L]
The structure of my project is
include
|
-Config.php
-DbConnect.php
-DbHandler.php
libs
|
-Slim
v1
|
-.htaccess
-index.php
I have uploaded my project in an Ubuntu Droplet i created in DigitalOcean, however when i run my project i get the exception below
Uncaught exception 'InvalidArgumentException' All Route middleware must be callable'
Is there anything i should change in my servers config docs?

Answer 1

Slim is trying to call a function that doesn't exist.
In every route definition you have a second parameter with the value 'authenticate' (for example in your $app->post('/articles', 'authenticate', function() use ($app) {});
You have to define the authenticate function somewhere before:
function authenticate() {
echo "My authenticate logic!";
}
Take a look to the documentation.