AI HTTP Client for WordPress

A professional WordPress library for unified AI provider communication. Supports OpenAI, Anthropic, Google Gemini, Grok, and OpenRouter with standardized request/response formats.

Key Features:

• WordPress filter-based architecture with self-contained provider classes
• Unified request/response format across all AI providers
• Comprehensive caching system with 24-hour model cache TTL
• Multi-modal support (text, images, files) via native Files API integration
• Streaming and standard request modes with proper error handling
• REST API endpoints for configuration and management
• Multisite network-wide API key storage support
• Comprehensive error handling with WordPress action hooks

Installation

Composer (recommended for standalone use):

composer require chubes4/ai-http-client

Git Subtree (recommended for plugin embedding):

git subtree add --prefix=lib/ai-http-client https://github.com/chubes4/ai-http-client.git main --squash

Manual Installation: Download and include in your WordPress plugin or theme

Requirements: PHP 7.4+, WordPress environment

Upgrading from v1.x to v2.0

Breaking Changes: All filter/action hooks renamed from ai_* to chubes_ai_* for WordPress.org compliance.

Automatic Migration

API keys are automatically migrated on first admin page load:

• Old option: ai_http_shared_api_keys
• New option: chubes_ai_http_shared_api_keys
• Old option deleted after 30 days

Hook Migration

Update all references in your code:

// OLD (v1.x)
apply_filters('ai_providers', [])
apply_filters('ai_provider_api_keys', null)
apply_filters('ai_models', $provider)
apply_filters('ai_tools', [])
apply_filters('ai_request', $request)
apply_filters('ai_file_to_base64', '', $path)
apply_filters('ai_http', [], $method, $url, $args)

// NEW (v2.0)
apply_filters('chubes_ai_providers', [])
apply_filters('chubes_ai_provider_api_keys', null)
apply_filters('chubes_ai_models', $provider)
apply_filters('chubes_ai_tools', [])
apply_filters('chubes_ai_request', $request)
apply_filters('chubes_ai_file_to_base64', '', $path)
apply_filters('chubes_ai_http', [], $method, $url, $args)

See docs/CHANGELOG.md for complete migration details.

Usage

Include Library:

// Composer: Auto-loads via Composer (no includes needed)

// Git Subtree/Manual: Include in your plugin
require_once plugin_dir_path(__FILE__) . 'lib/ai-http-client/ai-http-client.php';

Basic Request:

$response = apply_filters('chubes_ai_request', [
    'messages' => [['role' => 'user', 'content' => 'Hello AI!']]
], 'openai'); // Provider name is now required

Advanced Options:

// Specific provider (required parameter)
$response = apply_filters('chubes_ai_request', $request, 'anthropic');

// With streaming callback
$response = apply_filters('chubes_ai_request', $request, 'openai', $streaming_callback);

// With function calling tools
$response = apply_filters('chubes_ai_request', $request, 'openai', null, $tools);

// With conversation continuation
$response = apply_filters('chubes_ai_request', $request, 'openai', null, $tools, $conversation_data);

Providers

Comprehensive AI provider support with dynamic model discovery:

• OpenAI - GPT models, OpenAI Responses API, streaming, function calling, native Files API integration
• Anthropic - Claude models, streaming, function calling, native Files API integration with vision support
• Google Gemini - Gemini models, streaming, function calling, native Files API integration with vision support
• Grok/X.AI - Grok models, streaming support
• OpenRouter - 200+ models via unified API gateway

Architecture

• Filter-Based: WordPress-native provider registration via chubes_ai_providers filter
• Self-Contained: Each provider handles format conversion internally (standard ↔ provider format)
• Unified Interface: All providers accept standard format, return normalized responses
• WordPress-Native: Uses wp_remote_* for HTTP, WordPress transients for caching
• Modular Design: Provider files self-register, no central coordination needed
• Error Handling: Comprehensive error hook via chubes_ai_library_error action
• Performance: 24-hour model caching with granular cache clearing

Multi-Plugin Support

• Plugin-isolated configurations via filter-based settings
• Centralized API key storage in chubes_ai_http_shared_api_keys option
• Multisite network-wide API key storage support
• No provider conflicts through self-contained architecture
• Independent AI settings per consuming plugin

Core Components

• Providers: Self-contained classes with unified interface (OpenAI, Anthropic, Gemini, Grok, OpenRouter)
• Request Processing: Complete pipeline via chubes_ai_request filter with error handling
• HTTP Layer: Centralized chubes_ai_http filter supporting streaming and standard requests
• Caching System: Model caching via AIHttpCache class with WordPress transients
• REST API: Configuration and management endpoints via ai_http_client namespace
• Error Management: Centralized logging via AIHttpError class

Core Filters

// Provider Discovery
$providers = apply_filters('chubes_ai_providers', []);

// API Keys Management
$keys = apply_filters('chubes_ai_provider_api_keys', null); // Get all keys
apply_filters('chubes_ai_provider_api_keys', $new_keys);     // Update all keys

// Dynamic Model Fetching (with 24-hour cache)
$models = apply_filters('chubes_ai_models', $provider_name, $config);

// AI Tools Registration
$tools = apply_filters('chubes_ai_tools', []);

// File Operations
$base64 = apply_filters('chubes_ai_file_to_base64', '', $file_path, $options);

// HTTP Requests (internal use)
$result = apply_filters('chubes_ai_http', [], 'POST', $url, $args, 'Context');

REST API Endpoints

The library provides REST API endpoints for configuration and management:

// Configure API keys via REST API
wp_remote_post('/wp-json/ai-http-client/v1/api-keys/openai', [
    'body' => wp_json_encode([
        'api_key' => 'your-api-key'
    ]),
    'headers' => [
        'Content-Type' => 'application/json',
        'X-WP-Nonce' => wp_create_nonce('wp_rest')
    ]
]);

// Get provider configuration
$config = wp_remote_get('/wp-json/ai-http-client/v1/api-keys/openai', [
    'headers' => [
        'X-WP-Nonce' => wp_create_nonce('wp_rest')
    ]
]);

// Get available models for a provider
$models = wp_remote_get('/wp-json/ai-http-client/v1/models/openai', [
    'headers' => [
        'X-WP-Nonce' => wp_create_nonce('wp_rest')
    ]
]);

// Get all available providers
$providers = wp_remote_get('/wp-json/ai-http-client/v1/providers', [
    'headers' => [
        'X-WP-Nonce' => wp_create_nonce('wp_rest')
    ]
]);

Available Endpoints:

• GET/POST /wp-json/ai-http-client/v1/api-keys/{provider} - Get/set API key for specific provider
• GET /wp-json/ai-http-client/v1/models/{provider} - Get available models for a provider
• GET /wp-json/ai-http-client/v1/providers - List all available providers

Multi-Plugin Configuration

Shared API Keys Storage:

// WordPress option: 'chubes_ai_http_shared_api_keys'
$shared_keys = apply_filters('chubes_ai_provider_api_keys', null);
// Returns: ['openai' => 'sk-...', 'anthropic' => 'sk-ant-...', ...]

Provider Configuration:

// Each provider accepts configuration in constructor
$provider = new AI_HTTP_OpenAI_Provider([
    'api_key' => 'sk-...',
    'organization' => 'org-...',
    'base_url' => 'https://api.openai.com/v1' // Optional custom endpoint
]);

AI Tools System

Tool Registration:

add_filter('chubes_ai_tools', function($tools) {
    $tools['file_processor'] = [
        'class' => 'FileProcessor_Tool',
        'category' => 'file_handling',
        'description' => 'Process files and extract content',
        'parameters' => [
            'file_path' => [
                'type' => 'string',
                'required' => true,
                'description' => 'Path to file to process'
            ]
        ]
    ];
    return $tools;
});

Tool Discovery and Usage:

// Get all registered tools
$all_tools = apply_filters('chubes_ai_tools', []);

// Pass tools to AI request
$response = apply_filters('chubes_ai_request', $request, 'openai', null, $tools);
// Note: Tool execution is handled by consuming plugins

Distribution

• Packagist: Available via composer require chubes4/ai-http-client
• GitHub: https://github.com/chubes4/ai-http-client
• Version: 2.0.7 - Professional WordPress library with BaseProvider architecture
• License: GNU GPL v3
• Dependencies: None (pure WordPress integration)
• Multi-plugin: Safe for concurrent use by multiple WordPress plugins

Adding Providers

class AI_HTTP_MyProvider {
    public function __construct($config = []) { /* Provider setup */ }
    public function is_configured() { /* Check if ready */ }
    public function request($standard_request) { /* Standard → Provider → Standard */ }
    public function streaming_request($standard_request, $callback) { /* Streaming support */ }
    public function get_normalized_models() { /* Get models for UI */ }
    public function get_raw_models() { /* Get raw API response */ }
}

// Self-register via filter
add_filter('chubes_ai_providers', function($providers) {
    $providers['myprovider'] = [
        'class' => 'AI_HTTP_MyProvider',
        'type' => 'llm',
        'name' => 'My Provider'
    ];
    return $providers;
});

Version 2.0.0 Features

WordPress.org Compliance:

• All filter/action hooks renamed from ai_* to chubes_ai_* prefix
• Automatic migration system for API keys and settings
• Backward compatibility migration for 30-day rollback window

Core Architecture:

• WordPress filter-based provider registration with self-contained classes
• Unified request/response format across all providers
• Comprehensive caching system with 24-hour model cache TTL
• Native Files API integration for multi-modal content (text, images, files)
• Streaming and standard request modes with proper error handling
• REST API endpoints for configuration and management
• Multisite network-wide API key storage support

AI Provider Support:

• OpenAI Responses API integration with native Files API support
• Anthropic Claude models with dynamic model discovery and native Files API
• Google Gemini with native Files API and multi-modal support
• Grok/X.AI integration with streaming support
• OpenRouter gateway access to 200+ models

WordPress Integration:

• Native WordPress HTTP API usage with centralized chubes_ai_http filter
• WordPress transients for model caching with granular cache clearing
• WordPress options API for settings with multisite support
• Comprehensive error handling via chubes_ai_library_error action hook

Production Usage

This library is actively used in production WordPress plugins:

• Data Machine - AI-powered content processing pipelines with multi-provider support
• WordSurf - AI content editor with streaming responses and function calling
• AI Bot for bbPress - Forum AI responses with contextual conversation management

Debug

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);

Debug Logging Covers:

• HTTP request/response cycles via chubes_ai_http filter
• Provider-specific API interactions
• Model caching operations and cache hits/misses
• Streaming request handling
• Error conditions via chubes_ai_library_error action hook
• File upload operations to provider APIs

Contributing

Pull requests welcome for:

• Additional AI provider integrations
• Performance optimizations and caching improvements
• WordPress compatibility enhancements
• Template component additions
• Documentation improvements

License

GNU GPL v3 - Chris Huber