shopware-appserver-go: A Go repository from janbuecker

Foundation for Shopware apps based on Go

This library provides helper functions to write Shopware apps with a Go backend server. The library handles authorization as well as webhooks and actions.

Features

Automated handshake for easy installation in Shopware
Easy configuration with no additional router set-up needed
Generic endpoints for admin action buttons and webhooks
Written in Go, a language with high memory safety guarantees

Quick start

Installing

To start using the app server, install Go and run go get:

$ go get github.com/janbuecker/shopware-appserver-go

Storage engines

The app server comes with one storage engine included: in-memory.

This storage resets on every restart of the server and should only be used for quick-start purposes. All information is lost when the process is killed. This storage is used by default.

Events

First, register a POST route in your web server and use HandleWebhook inside the handler:

mux.HandleFunc("/webhook", func(w http.ResponseWriter, r *http.Request) {
    if err := srv.HandleWebhook(r); err != nil {
      // handle errors
   }

    // webhook handled successfully
})

To listen on an event, add the event to your manifest.xml file in your app and point it to your webhook endpoint. Verifying the signature is done automatically for you.

manifest.xml

<webhooks>
    <webhook name="orderCompleted" url="https://appserver.com/webhooks" event="checkout.order.placed"/>
</webhooks>

<permissions>
   <read>order</read>
</permissions>

You can then register an event listener to the app server:

srv.Event("checkout.order.placed", func(ctx context.Context, webhook appserver.WebhookRequest, api *appserver.APIClient) error {
    // do something on this event

    return nil
})

Action buttons

First, register a POST route in your web server and use HandleAction inside the handler:

mux.HandleFunc("/actions", func(w http.ResponseWriter, r *http.Request) {
    if err := srv.HandleAction(r); err != nil {
      // handle errors
   }

    // action handled successfully
})

To listen on a click on an action button, add the action button to your manifest.xml file in your app and point it to your actions endpoint. Verifying the signature is done automatically for you.

manifest.xml

<admin>
    <action-button action="doSomething" entity="product" view="detail" url="https://appserver.com/actions">
        <label>do something</label>
    </action-button>
</admin>

You can then register an admin action listener to the app server:

srv.Action("product", "doSomething", func(ctx context.Context, action appserver.ActionRequest, api *appserver.APIClient) error {
    // do something when someone clicks the action button

    return nil
})

Full example

Here is a full example on an app server, that uses the standard http package and listens for events and action buttons.

package main

import (
   "encoding/json"
   "log"
   "net/http"
   
   appserver "github.com/janbuecker/shopware-appserver-go"
)

func main() {
   srv := appserver.NewServer(
      "AppName",
      "AppSecret",
      "https://appserver.com/setup/register-confirm",
   )

   // event listener
   srv.Event("checkout.order.placed", func(ctx context.Context, webhook appserver.WebhookRequest, api *appserver.APIClient) error {
      // do something on this event
      
      return nil
   })

   // action buttons
   srv.Action("product", "doSomething", func(ctx context.Context, action appserver.ActionRequest, api *appserver.APIClient) error {
      // do something when someone clicks the action button
      
      return nil
   })
   
   // register routes and start server
   mux := http.NewServeMux()
   mux.HandleFunc("/webhooks", func(w http.ResponseWriter, r *http.Request) {
      if err := srv.HandleWebhook(r); err != nil {
         http.Error(w, err.Error(), http.StatusBadRequest)
         return
      }

      w.WriteHeader(200)
   })
   mux.HandleFunc("/actions", func(w http.ResponseWriter, r *http.Request) {
      if err := srv.HandleAction(r); err != nil {
         http.Error(w, err.Error(), http.StatusBadRequest)
         return
      }

      w.WriteHeader(200)
   })
   mux.HandleFunc("/setup/register", func(w http.ResponseWriter, r *http.Request) {
      reg, err := srv.HandleRegistration(r)
      if err != nil {
         http.Error(w, err.Error(), http.StatusBadRequest)
         return
      }

      regJSON, err := json.Marshal(reg)
      if err != nil {
         http.Error(w, err.Error(), http.StatusInternalServerError)
         return
      }

      w.WriteHeader(200)
      w.Write(regJSON)
   })

   mux.HandleFunc("/setup/register-confirm", func(w http.ResponseWriter, r *http.Request) {
      if err := srv.HandleConfirm(r); err != nil {
         http.Error(w, err.Error(), http.StatusBadRequest)
         return
      }

      w.WriteHeader(200)
   })

   log.Println("Listening on port 10100")
   log.Fatal(http.ListenAndServe(":10100", mux))
}

About

The app server written in Go is an open-source project and maintained by @janbuecker.

janbuecker/shopware-appserver-go