Coldbox Proxy

ColdBox Proxy

When to Use This Skill

Use this skill when you need to expose your ColdBox application to non-HTTP callers: SOAP web services, Flex/AIR binary protocol, ColdFusion event gateways, or any remote CFC invocation that bypasses the normal HTTP request cycle.

Core Concepts

• Proxy — A CFC that extends coldbox.system.remote.ColdboxProxy and acts as an interface between external callers and the ColdBox event model
• process() — Executes a ColdBox event from within the proxy; all extra arguments are merged into the request collection
• loadColdBox() — For loading an external ColdBox app whose Application.cfc is not in the webroot
• COLDBOX_APP_MAPPING — Required in Application.cfc when the ColdBox app lives in a sub-folder and uses non-HTTP protocols (Flex/AIR, gateways)
• preProxyResults interception point — Fires right before proxy returns results; ideal for logging, transformation

File Organization

Create a remote/ folder in your application root and place one or more proxy CFCs there, organized by domain:

/Application
  /remote
    UserProxy.cfc
    OrderProxy.cfc

Basic Proxy Structure

// remote/UserProxy.cfc
component extends="coldbox.system.remote.ColdboxProxy" {

    /**
     * Get a list of users
     * @page  Page number
     * @limit Records per page
     */
    array function getUsers( numeric page = 1, numeric limit = 25 ) {
        arguments.event = "api.users.index";
        var results = super.process( argumentCollection = arguments );
        return results ?: [];
    }

    /**
     * Get a single user by ID
     */
    struct function getUser( required numeric id ) {
        arguments.event = "api.users.show";
        var results = super.process( argumentCollection = arguments );
        return results ?: {};
    }

    /**
     * Save a user record
     */
    struct function saveUser( required struct userData ) {
        arguments.event = "api.users.save";
        structAppend( arguments, userData );
        return super.process( argumentCollection = arguments ) ?: {};
    }
}

Matching Event Handler

The event handler accessed via process() can return data just as it would in an HTTP call. Handlers can distinguish proxy calls from browser calls using event.isProxyRequest():

// handlers/api/Users.cfc
component extends="coldbox.system.EventHandler" {

    property name="userService" inject="UserService";

    function index( event, rc, prc ) {
        var data = userService.list(
            page  = rc.page  ?: 1,
            limit = rc.limit ?: 25
        );

        // Return data directly when called via proxy
        if ( event.isProxyRequest() ) {
            return data.getRecords();
        }

        // Normal MVC view rendering
        prc.users = data;
        event.setView( "users/index" );
    }
}

Proxy Methods Reference

AppMapping for Non-HTTP Protocols

When using Flex/AIR or event gateways (no HTTP), ColdBox cannot auto-detect your app location. Set COLDBOX_APP_MAPPING in Application.cfc:

// Application.cfc
component {
    // Empty string means app is at webroot (default)
    COLDBOX_APP_MAPPING = "";

    // Sub-folder: app lives at /apps/myApp
    // COLDBOX_APP_MAPPING = "apps.myApp";
}

COLDBOX_APP_MAPPING is an instantiation path, not a file system path.

Interception: preProxyResults

Use the preProxyResults interception point to transform, log, or audit results before they are returned to the caller:

// interceptors/ProxyLogger.cfc
component extends="coldbox.system.Interceptor" {

    property name="log" inject="logbox:logger:{this}";

    function preProxyResults( event, interceptData ) {
        log.debug( "Proxy call completed", {
            event   : event.getCurrentEvent(),
            results : interceptData.proxyResults
        } );
    }
}

ProxyReturnCollection Setting

By default, process() returns whatever the event handler returns. To always return the full request collection instead, set:

// config/ColdBox.cfc
coldbox = {
    proxyReturnCollection : true
};

SOAP Web Service Example

// remote/ProductService.cfc
component
    extends    = "coldbox.system.remote.ColdboxProxy"
    output     = "false"
    hint       = "Product remote service"
{
    /**
     * @webservice true
     */
    remote array function getProducts( string category = "" ) {
        arguments.event = "api.products.index";
        return super.process( argumentCollection = arguments ) ?: [];
    }

    remote struct function getProduct( required string id ) {
        arguments.event = "api.products.show";
        return super.process( argumentCollection = arguments ) ?: {};
    }
}

Key Rules

• Never place business logic inside proxy CFCs — delegate everything to handlers via process().
• Keep proxy CFCs organized by domain (e.g., UserProxy, OrderProxy) rather than one giant proxy.
• Always provide a safe default return value (?: [], ?: {}) in case the event returns nothing.
• Use event.isProxyRequest() in handlers to differentiate proxy vs. HTTP responses.
• Set COLDBOX_APP_MAPPING only when using non-HTTP protocols and the app is NOT at the webroot.