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https://github.com/tab/smartid

Go client for the Smart-ID API
https://github.com/tab/smartid

authentication go golang smart-id

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Go client for the Smart-ID API

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# Go Smart-ID client

Golang client for the Smart-ID API (https://www.smart-id.com).
It is a simple wrapper around the API, which helps easily integrate Smart-ID authentication into Golang applications.

## Features

- Flexible client configuration
- Concurrent processing
- Optional TLS configuration (certificate pinning)

## Installation

Use `go get` to install the package

```sh
go get -u github.com/tab/smartid
```

## Usage

### Creating a Client

Create a new client using `NewClient()` and customize its configuration using chainable methods.

```go
package main

import (
"context"
"log"
"time"

"github.com/tab/smartid"
)

func main() {
client := smartid.NewClient().
WithRelyingPartyName("DEMO").
WithRelyingPartyUUID("00000000-0000-0000-0000-000000000000").
WithCertificateLevel("QUALIFIED").
WithHashType("SHA512").
WithInteractionType("displayTextAndPIN").
WithDisplayText60("Enter PIN1").
WithDisplayText200("Confirm the authentication request and enter PIN1").
WithURL("https://sid.demo.sk.ee/smart-id-rp/v2").
WithTimeout(60 * time.Second)

if err := client.Validate(); err != nil {
log.Fatal("Invalid configuration:", err)
}

// Further processing...
}
```

### Start Authentication

Initiate a new authentication session with the `Smart-ID` provider by calling `CreateSession`.
This function generates a random hash, constructs the session request, and returns a session that includes an identifier and a verification code.

```go
func main() {
// Create a client...

identity := smartid.NewIdentity(smartid.TypePNO, "EE", "30303039914")

session, err := client.CreateSession(context.Background(), identity)
if err != nil {
log.Fatal("Error creating session:", err)
}

fmt.Println("Session created:", session)
}
```

### Fetch Session

```go
func main() {
// Create a client...

person, err := client.FetchSession(context.Background(), sessionId)
if err != nil {
log.Fatal("Error fetching session:", err)
}

fmt.Println("Session status:", session.State)
}
```

### Async Example

For applications requiring the processing of multiple authentication sessions simultaneously, `Smart-ID` provides a worker model.
Create a worker using `NewWorker`, configure its concurrency and queue size, and then start processing.

```go
package main

import (
"context"
"fmt"
"log"
"sync"
"time"

"github.com/tab/smartid"
)

func main() {
client := smartid.NewClient().
WithRelyingPartyName("DEMO").
WithRelyingPartyUUID("00000000-0000-0000-0000-000000000000").
WithCertificateLevel("QUALIFIED").
WithHashType("SHA512").
WithInteractionType("displayTextAndPIN").
WithDisplayText60("Enter PIN1").
WithDisplayText200("Confirm the authentication request and enter PIN1").
WithURL("https://sid.demo.sk.ee/smart-id-rp/v2").
WithTimeout(60 * time.Second)

identities := []string{
smartid.NewIdentity(smartid.TypePNO, "EE", "30303039914"),
smartid.NewIdentity(smartid.TypePNO, "EE", "30403039917"),
smartid.NewIdentity(smartid.TypePNO, "EE", "30403039928"),
// Add more identities as needed
}

worker := smartid.NewWorker(client).
WithConcurrency(50).
WithQueueSize(100)

ctx := context.Background()
worker.Start(ctx)
defer worker.Stop()

var wg sync.WaitGroup

for _, identity := range identities {
wg.Add(1)

session, err := client.CreateSession(ctx, identity)
if err != nil {
log.Println("Error creating session:", err)
wg.Done()
continue
}
fmt.Println("Session created:", session)

resultCh := worker.Process(ctx, session.Id)
go func() {
defer wg.Done()
result := <-resultCh
if result.Err != nil {
log.Println("Error fetching session:", result.Err)
} else {
fmt.Println("Fetched person:", result.Person)
}
}()
}

wg.Wait()
}
```

### Certificate pinning (optional)

```go
package main

import (
"context"
"fmt"
"sync"
"time"

"github.com/tab/smartid"
)

func main() {
manager, err := smartid.NewCertificateManager("./certs")
if err != nil {
fmt.Println("Failed to create certificate manager:", err)
}
tlsConfig := manager.TLSConfig()

client := smartid.NewClient().
WithRelyingPartyName("DEMO").
WithRelyingPartyUUID("00000000-0000-0000-0000-000000000000").
WithCertificateLevel("QUALIFIED").
WithHashType("SHA512").
WithInteractionType("displayTextAndPIN").
WithDisplayText60("Enter PIN1").
WithDisplayText200("Confirm the authentication request and enter PIN1").
WithURL("https://sid.demo.sk.ee/smart-id-rp/v2").
WithTimeout(60 * time.Second).
WithTLSConfig(tlsConfig)

// Further processing...
```

### Prepare Identity

Smart-ID requires a properly formatted identity string. Use the `NewIdentity` function to create this string.
It combines the identity type, country code, and the identifier value.

```go
package main

import (
"fmt"

"github.com/tab/smartid"
)

func main() {
identity := smartid.NewIdentity(smartid.TypePNO, "EE", "30303039914")
fmt.Println("Formatted identity:", identity)
}
```

## Documentation

- [Documentation](https://tab.github.io/smartid)
- [GoDoc](https://pkg.go.dev/github.com/tab/smartid)
- [Smart-ID Documentation](https://github.com/SK-EID/smart-id-documentation)

## License

Distributed under the MIT License. See `LICENSE` for more information.

## Acknowledgements

- [SK ID Solutions](https://www.skidsolutions.eu)
- [Smart-ID](https://www.smart-id.com)