Saloon PHP HTTP Proxy Plugin

A robust HTTP proxy management plugin for Saloon PHP, allowing you to easily use and rotate proxies in your API requests.

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Table of Contents

• Features
• Requirements
• Installation
• Usage
  • Basic Setup
  • Adding Proxies
  • Proxy Rotation
  • Custom Proxy Switching
  • Force Using Proxies
  • Temporarily Disable Proxies
  • Proxy Availability Management
• Advanced Usage
  • Custom Proxy Queue
  • Request-Specific Proxies
  • Concurrent Requests
  • Error Handling
• Contributing
• License
• Credits

Features

• 🔄 Stateless proxy management aligned with Saloon design principles
• 🔌 Automatic proxy fallback on connection failures
• 🔀 Customizable proxy rotation strategies (FIFO queue with round-robin support)
• 🔐 Support for authenticated proxies (username/password)
• 🧩 Simple integration with Saloon requests and connectors
• 🚦 Dynamic proxy availability management
• 🔍 Smart handling of proxy failures with custom exceptions

Requirements

• PHP 8.0 or higher
• Saloon PHP v2.0 or higher

Installation

You can install the package via composer:

composer require weijiajia/saloonphp-http-proxy-plugin

Usage

Basic Setup

1. Implement the ProxyManagerInterface in your connector or request class
2. Add the HasProxy trait to your Saloon connector or request class:

use Saloon\Http\Connector;
use Weijiajia\SaloonphpHttpProxyPlugin\HasProxy;
use Weijiajia\SaloonphpHttpProxyPlugin\Contracts\ProxyManagerInterface;

class MyApiConnector extends Connector implements ProxyManagerInterface
{
    use HasProxy;
    
    public function resolveBaseUrl(): string
    {
        return 'https://api.example.com';
    }
}

Adding Proxies

Add proxies to your connector or request object:

// Create a connector
$connector = new MyApiConnector();

// Add proxies from URLs
$connector->getProxyQueue()->enqueue('http://proxy1.example.com:8080');
$connector->getProxyQueue()->enqueue('http://user:[email protected]:8080');

// Or use Proxy objects
use Weijiajia\SaloonphpHttpProxyPlugin\Proxy;

$proxy = new Proxy(
    host: 'proxy3.example.com',
    port: 8080,
    url: 'http://proxy3.example.com:8080',
    type: 'http',
    username: 'user',
    password: 'pass'
);

$connector->getProxyQueue()->enqueue($proxy);

// Set a custom proxy queue
use Weijiajia\SaloonphpHttpProxyPlugin\ProxySplQueue;

$proxyQueue = new ProxySplQueue(roundRobinEnabled: true, proxies: ['http://proxy1.example.com:8080']);
$connector->withProxyQueue($proxyQueue); // Use new method name

Proxy Rotation

Enable round-robin proxy rotation to cycle through available proxies:

// Enable round-robin mode directly on the proxy queue
$connector->getProxyQueue()->setRoundRobinEnabled(true);

// Or use the convenience method
$connector->roundRobin(true);

Force Using Proxies

You can force your requests to only proceed if a proxy is available:

$connector->withForceProxy(true); // Default is true

Temporarily Disable Proxies

$connector->withProxyEnabled(false);

Proxy Availability Management

You can mark proxies as available or unavailable:

// Get all proxies in the queue
$proxies = $connector->getProxyQueue()->getAllProxies();

// Mark a proxy as unavailable
$proxies[0]->setAvailable(false);

// Check if a proxy is available
$isAvailable = $proxies[0]->isAvailable(); // returns false

Advanced Usage

Custom Proxy Queue

You can implement your own proxy queue by extending the ProxySplQueue class:

use Weijiajia\SaloonphpHttpProxyPlugin\ProxySplQueue;
use Weijiajia\SaloonphpHttpProxyPlugin\Contracts\ProxyInterface;

class PrioritizedProxyQueue extends ProxySplQueue
{
    // Your custom implementation with prioritization
    
    public function dequeue(): mixed
    {
        // Custom dequeue logic that considers priority
        // ...
    }
    
    // You can also implement additional methods
    public function addWithPriority(ProxyInterface $proxy, int $priority): void
    {
        // Custom logic to add proxy with priority
    }
}

$connector->withProxyQueue(new PrioritizedProxyQueue());

Request-Specific Proxies

The HasProxy trait can be used on individual requests as well:

use Saloon\Http\Request;
use Weijiajia\SaloonphpHttpProxyPlugin\HasProxy;
use Weijiajia\SaloonphpHttpProxyPlugin\Contracts\ProxyManagerInterface;

class MyApiRequest extends Request implements ProxyManagerInterface
{
    use HasProxy;
    
    protected ?string $method = 'GET';
    
    public function resolveEndpoint(): string
    {
        return '/api/endpoint';
    }
    
    public function __construct()
    {
        // Add request-specific proxies
        $this->getProxyQueue()->enqueue('http://request-specific-proxy.example.com:8080');
    }
}

Error Handling

use Weijiajia\SaloonphpHttpProxyPlugin\Exceptions\NoAvailableProxyException;
use Weijiajia\SaloonphpHttpProxyPlugin\Exceptions\HasProxyException;

try {
    $connector->withForceProxy(true);
    $response = $connector->send(new MyRequest());
} catch (NoAvailableProxyException $e) {
    // Handle the case when no proxies are available
    echo "No proxies available: " . $e->getMessage();
} catch (HasProxyException $e) {
    // Handle interface implementation issues
    echo "Proxy configuration error: " . $e->getMessage();
} catch (\Exception $e) {
    // Handle other exceptions
    echo "Request error: " . $e->getMessage();
}

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This package is open-sourced software licensed under the MIT license.

Credits

• weijiajia
• All Contributors