Sample Backend for Go (aka Golang)

This repository contains a sample backend code that demonstrates how to generate a Virgil JWT using the Golang SDK

Do not use this authentication in production. Requests to a /virgil-jwt endpoint must be allowed for authenticated users. Use your application authorization strategy.

Prerequisites

• Go aka Golang
• Virgil Security GO SDK

Clone

Clone the repository from GitHub.

$ git clone https://github.com/VirgilSecurity/sample-backend-go.git

Get Virgil Credentials

If you don't have an account yet, sign up for one using your e-mail.

To generate a JWT the following values are required:

Variable Name	Description
APP_KEY	Private key of your API key that is used to sign the JWTs.
APP_KEY_ID	ID of your API key. A unique string value that identifies your account in the Virgil Cloud.
APP_ID	ID of your Virgil Application.

Add Virgil Credentials to .env

• open the project folder
• create a .env file
• fill it with your account credentials (take a look at the .env.example file to find out how to setup your own .env file)
• save the .env file

Install Dependencies and Run the Server

To run the server go to the server example directory and run

$ set -a && source '<yourenvfile>.env' && go run main.go

Now, use your client code to make a request to get a JWT from the sample backend that is working on http://localhost:3000.

Specification

/authenticate endpoint

This endpoint is an example of users authentication. It takes user identity and responds with unique token.

POST https://localhost:3000/authenticate HTTP/1.1
Content-type: application/json;

{
    "identity": "string"
}

Response:

{
    "authToken": "string"
}

/virgil-jwt endpoint

This endpoint checks whether a user is authorized by an authorization header. It takes user's authToken, finds related user identity and generates a virgilToken (which is JSON Web Token) with this identity in a payload. Use this token to make authorized api calls to Virgil Cloud.

GET https://localhost:3000/virgil-jwt HTTP/1.1
Content-type: application/json;
Authorization: Bearer <authToken>

Response:

{
    "virgilToken": "string"
}

Virgil JWT Generation

To generate JWT, you need to use the JwtGenerator class from the SDK.

import (
	"github.com/VirgilSecurity/virgil-sdk-go/v6/crypto"
	"github.com/VirgilSecurity/virgil-sdk-go/v6/session"
)

	cryptoInstance := &crypto.Crypto{}
	cryptoPrivateKey, _ = cryptoInstance.ImportPrivateKey([]byte(os.Getenv("APP_KEY")))
	[...]
	tokenSigner := &session.VirgilAccessTokenSigner{}
	generator := &session.JwtGenerator{
		AppKey: cryptoPrivateKey,
		AppKeyID: os.Getenv("APP_KEY_ID"),
		AppID: os.Getenv("APP_ID"),
		AccessTokenSigner: tokenSigner,
		TTL: time.Hour,
	}
	return generator.GenerateToken(identity, nil)

Then you need to provide an HTTP endpoint which will return the JWT with the user's identity as a JSON.

For more details take a look at the main.go file.

License

This library is released under the 3-clause BSD License.

Support

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