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Go SDK Quickstart

Following the steps described on this page, you'll create a simple Go application that interacts with the Fatture in Cloud API.

If you want to download the complete working example you can find it here.

0️⃣  Prerequisites​

In this guide, we assume that these prerequisites are met:

1️⃣  Step One: Install the Fatture in Cloud SDK​

In this quickstart, we'll use the Fatture in Cloud SDK.

To install it:

go get github.com/fattureincloud/fattureincloud-go-sdk

2️⃣  Step Two: Set up the OAuth access token retrieval​

Create the file oauth.go and copy in the following code:

oauth.go
package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"

	oauth "github.com/fattureincloud/fattureincloud-go-sdk/v2/oauth2"
)

func getOAuthAccessToken(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query()
	auth := oauth.NewOAuth2AuthorizationCodeManager("CLIENT_ID", "CLIENT_SECRET", "http://localhost:8000/oauth")

	if query.Get("code") == "" {
		http.Redirect(w, r, auth.GetAuthorizationUrl([]oauth.Scope{oauth.Scopes.ENTITY_SUPPLIERS_READ}, "EXAMPLE_STATE"), http.StatusFound)
	} else {
		code := query.Get("code")

		token, err := auth.FetchToken(code)
		if err != nil {
			log.Println("Error on response.\n[ERROR] -", err)
			http.Error(w, "500 internal server error.", http.StatusInternalServerError)
			return
		}
		jsonObj, _ := json.Marshal(token)
		// saving the oAuth access token in the token.json file
		err = ioutil.WriteFile("token.json", jsonObj, 0644)

		if err != nil {
			log.Println("Error on writing the file.\n[ERROR] -", err)
			http.Error(w, "500 internal server error.", http.StatusInternalServerError)
			return
		}

		fmt.Fprintf(w, "Token succesfully retrived and stored in token.json")

	}
}

To make this code work properly the only thing you need to set your client id, client secret and eventually the redirect uri at line 15.

Store the Token safely!

In this QuickStart the access token and refresh token are stored in a file. This is only for educational purposes, the OAuth access token and refresh token are sensitive data and should be saved securely on your database. Also, never share your Client Secret with third-party actors, or publish it to your frontend!

4️⃣  Step Four: Set up the sample​

Retrieve your Company ID!

In this example, we'll show how to retrieve your Company ID using the Go SDK. If you plan to manage only one company, you can insert it directly into your code as a variable. Check the Company-scoped Methods page for more info.

Create the files main.go and quickstart.go in your working directory and copy in the following code:

main.go
package main

import (
	"fmt"
	"log"
	"net/http"
)

func main() {
	http.HandleFunc("/oauth", getOAuthAccessToken)
	http.HandleFunc("/quickstart", getFirstCompanySuppliers)

	fmt.Printf("Starting server at port 8000\n")
	if err := http.ListenAndServe(":8000", nil); err != nil {
		log.Fatal(err)
	}
}
Check the Redirect URL

Make sure your FattureInCloud app redirect URL points at the just edited file (e.g. http://localhost:8000/oauth).

5️⃣  Step Five: Run the sample​

From the command line, run the following command:

go run .

Now visit http://localhost:8000/oauth (or whatever your URL is), you will be redirected to the Fatture in Cloud login page where you will be asked to grant some permissions, according to what scopes you specified previously. Finally, you will see the success message and the access token will be stored in the token.json file.

You can now visit http://localhost:8000/quickstart (or whatever your URL is) to test the application.

❓  What now?​

In this example, we used a limited set of the available API methods to show how to use our SDK.

If you want to access the full documentation of the available methods and models, you can check the following resources: