CodeIgniter CRUD Using WordPress REST API with JWT

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Creating a CodeIgniter CRUD application that interacts with WordPress through its REST API using JWT authentication offers a robust solution for managing WordPress content from an external application.

In this tutorial, we’ll explore the process of integrating CodeIgniter’s CRUD operations with WordPress’s RESTful API, securing the communication using JSON Web Tokens (JWT). You will see the complete guide to create WordPress posts, list posts and their update operations with CodeIgniter.

WordPress’s REST API provides a way to access and modify WordPress content externally, while JWT authentication ensures secure and authenticated communication between CodeIgniter and WordPress.

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Let’s get started.

WordPress Configuration

Set up a WordPress setup and configure the REST API with JWT authentication Using plugins like “JWT Authentication for WP REST API

>> Install this plugin and activate.

Configure the JWT Secret Key

The JWT needs a secret key to sign the token this secret key must be unique and never revealed.

To add the secret key edit your wp-config.php file and add a new constant called JWT_AUTH_SECRET_KEY

define('JWT_AUTH_SECRET_KEY', 'your-top-secret-key');

Configure CORS Support

To enable the CORs Support edit your wp-config.php file and add a new constant called JWT_AUTH_CORS_ENABLE

define('JWT_AUTH_CORS_ENABLE', true);

Generate JWT Auth Token (Use in Calling APIs)

Once you install plugin, you will get a route by which we can get JWT authentication token value. But we need to pass username and password while calling that.

Auth API URL,

http://example.com/wp-json/jwt-auth/v1/token

Example,

Copy JWT Auth token value for calling REST APIs.

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CodeIgniter 4 Installation

To create a CodeIgniter 4 setup run this given command into your shell or terminal. Please make sure composer should be installed.

composer create-project codeigniter4/appstarter codeigniter-4

Assuming you have successfully installed application into your local system.

Application Basic Variables Settings

Open .env file from project folder,

WP_JWT_AUTH_TOKEN="eyJ0eXAiOiJKV1QiLCJhbGciO..."

WP_JSON_POST_URL="https://yourwordpresssite.com/wp-json/wp/v2/posts"

Change your keys values according to your application.

CRUD Application Routes Setup

Open Routes.php file from /app/Config folder.

//...
 $routes->get('/posts', 'PostController::index');
 $routes->match(["get", "post"], "add-post", 'PostController::addPost');
 $routes->match(["get", "post"], 'edit-post/(:num)', 'PostController::editPost/$1');
 $routes->post('delete-post/(:num)', 'PostController::deletePost/$1');
//...

Setup CRUD Controller

Back to project terminal and run this command into it,

php spark make:controller Post --suffix

It will create a PostController.php file inside /app/Controllers folder.

Controller file contains these methods for,

  • index(): To list all posts
  • addPost(): Open add post layout and save post to wordpress.
  • editPost(): Open single post details page with update function
  • deletePost(): Delete post by post id.

Open file and write this code into it,

<?php 
namespace App\Controllers;
use CodeIgniter\Controller;
use Config\Services;

class PostController extends Controller
{   
    // Page: Post List
    public function index()
    {
        $httpClient = Services::curlrequest();

        $wordpressUrl = env("WP_JSON_POST_URL"); // Replace with your WordPress site URL

        $request = $httpClient->request('GET', $wordpressUrl, [
            'headers' => [
                'Content-Type' => 'application/json'
            ],
        ]);

        $posts = json_decode($request->getBody(), true);

        return view('post-list', compact('posts'));
    }

    // Page: Post Create
    public function addPost()
    {
        if($this->request->getMethod() == "post"){

            $httpClient = Services::curlrequest();

            $wordpressUrl = env("WP_JSON_POST_URL");
            $accessToken = env("WP_JWT_AUTH_TOKEN"); // If authentication is required

            // Post data to be created
            $postData = [
                'title' => $this->request->getVar("title"),
                'content' => $this->request->getVar("content"),
                'status' => $this->request->getVar("status"), // Publish the post
                // Add other post fields as needed
            ];

            $request = $httpClient->request('POST', $wordpressUrl, [
                'headers' => [
                    'Content-Type' => 'application/json',
                    // Add authorization headers if required
                    'Authorization' => 'Bearer ' . $accessToken,
                ],
                'json' => $postData,
            ]);

            $response = json_decode($request->getBody(), true);

            session()->setFlashdata("success", "Post has been created");
            
            return redirect()->to(base_url("add-post"));
        }

        return view('post-create');
    }

    // Page: Post Update
    public function editPost($post_id)
    {
        $wordpressUrl = env("WP_JSON_POST_URL");
        $accessToken = env("WP_JWT_AUTH_TOKEN"); // If authentication is required

        if($this->request->getMethod() == "post"){

            $httpClient = Services::curlrequest();

            // Post data to be created
            $postData = [
                'title' => $this->request->getVar("title"),
                'content' => $this->request->getVar("content"),
                'status' => $this->request->getVar("status"), // Publish the post
                // Add other post fields as needed
            ];

            $request = $httpClient->request('POST', $wordpressUrl. "/" . $post_id, [
                'headers' => [
                    'Content-Type' => 'application/json',
                    // Add authorization headers if required
                    'Authorization' => 'Bearer ' . $accessToken,
                ],
                'json' => $postData,
            ]);

            $response = json_decode($request->getBody(), true);

            session()->setFlashdata("success", "Post has been updated");

            return redirect()->to(base_url("edit-post/". $post_id));
        }

        $httpClient = Services::curlrequest();

        $request = $httpClient->request('GET', $wordpressUrl. "/" .$post_id);

        $post = json_decode($request->getBody(), true);

        return view('post-edit', [
            "post" => $post
        ]);
    }

    // Page: Post Delete
    public function deletePost($post_id)
    {
        $httpClient = Services::curlrequest();

        $wordpressUrl = env("WP_JSON_POST_URL");
        $accessToken = env("WP_JWT_AUTH_TOKEN"); // If authentication is required

        $request = $httpClient->request('DELETE', $wordpressUrl. "/" . $post_id, [
            'headers' => [
                'Content-Type' => 'application/json',
                // Add authorization headers if required
                'Authorization' => 'Bearer ' . $accessToken,
            ]
        ]);

        $response = json_decode($request->getBody(), true);

        return redirect()->to(base_url("posts"));
    }
}

Next, we need to create front-end view files for CRUD operation.

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Setup CRUD Layout View Files

Create these template files inside /app/Views folder,

  • post-list.php
  • post-create.php
  • post-edit.php

Open each file and write these code

Post list template file: “post-list.php”,

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>CodeIgniter CRUD Using WordPress REST API with JWT Tutorial</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>

<body>
    <div class="container mt-2">
        <div class="row">
            <div class="col-lg-12 margin-tb">
                <div class="pull-left">
                    <h3>CodeIgniter CRUD Using WordPress REST API</h3>
                </div>
                <h4 class="text-center">Post List</h4>
                <div class="pull-right mb-2" style="float: right;">
                    <a class="btn btn-success" href="<?php echo base_url('add-post') ?>">Create Post</a>
                </div>
            </div>
        </div>

        <table class="table table-striped table-hover">
            <thead>
                <th>ID</th>
                <th>Post Title</th>
                <th>Post Content</th>
                <th width="280px">Action</th>
            </thead>
            <tbody>
                <?php foreach($posts as $post) { ?>
                <tr>

                    <td><?php echo $post['id']; ?></td>
                    <td><?php echo $post['title']['rendered']; ?></td>
                    <td><?php echo substr($post['content']['rendered'], 0, 100); ?></td>
                    <td>
                        <form action="<?php echo base_url('delete-post/'.$post['id']); ?>" method="Post">
                            <a class="btn btn-primary" href="<?php echo base_url('edit-post/'.$post['id']); ?>">Edit</a>
                            <button type="submit" onclick="return confirm('Are you sure want to delete?')"
                                class="btn btn-danger">Delete</button>
                        </form>
                    </td>
                </tr>
                <?php } ?>
            </tbody>
        </table>
    </div>
</body>

</html>

Create Post template file: “post-create.php”,

It will give us an interface such as for Title, Content and Status to create post.

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>CodeIgniter CRUD Using WordPress REST API with JWT Tutorial</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>

<body>
    <div class="container mt-2">
        <div class="row">
            <div class="col-lg-12 margin-tb">
                <div class="pull-left">
                    <h3>CodeIgniter CRUD Using WordPress REST API</h3>
                </div>
                <h4 class="text-center">Add Post</h4>
                <div class="pull-right" style="float: right;">
                    <a class="btn btn-primary" href="<?php echo base_url('posts') ?>"> Back</a>
                </div>
            </div>
        </div>
        <?php 
           if(session()->getFlashdata("success")){
            ?>
            <div class="alert alert-success mb-1 mt-1">
                <?php 
                echo session()->getFlashdata("success")
                ?>
            </div>
        <?php
           }
        ?>
        <form action="<?php echo base_url('add-post') ?>" method="POST">
            <div class="row">
                <div class="col-xs-12 col-sm-12 col-md-12">
                    <div class="form-group">
                        <strong>Title:</strong>
                        <input type="text" name="title" class="form-control" placeholder="Post Title">
                    </div>
                </div>
                <div class="col-xs-12 col-sm-12 col-md-12">
                    <div class="form-group">
                        <strong>Content:</strong>
                        <input type="text" name="content" class="form-control" placeholder="Post Content">
                    </div>
                </div>
                <div class="col-xs-12 col-sm-12 col-md-12">
                    <div class="form-group">
                        <strong>Status</strong>
                        <select name="status" class="form-control">
                            <option value="">-- Status --</option>
                            <option value="draft">Draft</option>
                            <option value="publish">Publish</option>
                        </select>
                    </div>
                </div>

                <button type="submit" class="btn btn-primary ml-3">Submit</button>
            </div>
        </form>
    </div>
</body>

</html>

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Update Post template file: “post-edit.php”,

It will give us an interface such as for Title, Content and Status to update post.

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>CodeIgniter CRUD Using WordPress REST API with JWT Tutorial</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>

<body>
    <div class="container mt-2">
        <div class="row">
            <div class="col-lg-12 margin-tb">
                <div class="pull-left">
                    <h3>CodeIgniter CRUD Using WordPress REST API</h3>
                </div>
                <h4 class="text-center">Edit Post</h4>
                <div class="pull-right" style="float: right;">
                    <a class="btn btn-primary" href="<?php echo base_url('posts') ?>">
                        Back</a>
                </div>
            </div>
        </div>
        <?php 
           if(session()->getFlashdata("success")){
            ?>
            <div class="alert alert-success mb-1 mt-1">
                <?php 
                echo session()->getFlashdata("success")
                ?>
            </div>
        <?php
           }
        ?>
        <form action="<?php echo base_url('edit-post/'.$post['id']) ?>" method="POST">

            <div class="row">
                <div class="col-xs-12 col-sm-12 col-md-12">
                    <div class="form-group">
                        <strong>Title:</strong>
                        <input type="text" name="title" value="<?php echo $post['title']['rendered']; ?>" class="form-control"
                            placeholder="Post Title">
                    </div>
                </div>
                <div class="col-xs-12 col-sm-12 col-md-12">
                    <div class="form-group">
                        <strong>Content:</strong>
                        <input type="text" name="content" value="<?php echo $post['content']['rendered']; ?>"
                            class="form-control" placeholder="Content">
                    </div>
                </div>
                <div class="col-xs-12 col-sm-12 col-md-12">
                    <div class="form-group">
                        <strong>Status:</strong>
                        <select name="status" id="status" class="form-control">
                            <option value="">-- Status --</option>
                            <option <?php echo $post['status'] == "draft" ? "selected" : ""; ?> value="draft">Draft</option>
                            <option <?php echo $post['status'] == "publish" ? "selected" : ""; ?> value="publish">Publish
                            </option>
                        </select>
                    </div>
                </div>

                <button type="submit" class="btn btn-primary ml-3">Submit</button>
            </div>
        </form>
    </div>
</body>

</html>

Application Testing

Open project terminal and start development server via command:

php spark serve

URL: http://localhost:8080/posts

Lists Post,

It will list all posts of wordpress.

Create Post,

When you click on Create Post button, it will open layout to create post.

Update Post,

When you click on Edit button in List Post page, it will open layout to update post with existing data

Delete Post

When click on Delete button of List Post page,

WordPress backend admin panel for Posts data,

That’s it.

We hope this article helped you to learn about CodeIgniter CRUD Using WordPress REST API with JWT Tutorial Example in a very detailed way.

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