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Editing: MIGRATE-1.x-to-2.0.md

# Migrating from from 1.x to 2.x

This guide will help you migrating from a 1.x to a 2.x version. If you are updating from a <1.9 version, consider
updating to 1.9 first so that you can benefit from deprecation notices in your IDE.

## Dependencies

### JWT handling

[`lcobucci/jwt`](https://packagist.org/packages/lcobucci/jwt) has been removed as the default JWT library.
If you don't already have it in your project's dependencies, add it with `composer require lcobucci/jwt:^3.2` 
or by adding it directly to the `composer.json` file in your project's root directory:

```json
{
  "require": {
      "kreait/firebase-tokens": "^2.0",
      "lcobucci/jwt": "^3.2"
  }
}
```

The following JWT libraries are currently supported out of the box:
* [`lcobucci/jwt`](https://github.com/lcobucci/jwt)
* [`firebase/php-jwt`](https://github.com/firebase/php-jwt)

If you already have one of the supported JWT libraries present in your project, you can remove the previous
`lcobucci/jwt` dependency.

### HTTP handling

[guzzlehttp/guzzle](https://packagist.org/packages/guzzlehttp/guzzle) has been removed as the default HTTP handler. 
If you don't already have it in your project's dependencies, add it with `composer require guzzlehttp/guzzle:^6.2.1` 
or by adding it directly to the `composer.json` file in your project's root directory:

```json
{
  "require": {
      "kreait/firebase-tokens": "^2.0",
      "guzzlehttp/guzzle": "^6.2.1"
  }
}
```

## Changed return values

## Tokens

In 1.x, the Custom Token Generator and ID Token verifier returned instances of `Lcobucci\JWT\Token`.

In 2.0, the Custom Token Generator and ID Token verifier return instances of `Kreait\Firebase\JWT\Contracts\Token`.

## Error Handling

In 1.x, specialized exceptions types were thrown for different kind of errors.

In 2.x, only one exception per action is thrown.

- `Kreait\Firebase\JWT\Error\CustomTokenCreationFailed`
- `Kreait\Firebase\JWT\Error\IdTokenVerificationFailed`

## Changed usage

### Custom Token Generator

Replace usages of `Firebase\Auth\Token\Generator` with `Kreait\Firebase\JWT\CustomTokenGenerator`:

#### 1.x usage

```php
<?php

// Before
use Firebase\Auth\Token\Generator;

$generator = new Generator($clientEmail, $privateKey);
$token = $generator->createCustomToken($uid, $claims);
// Returns an instance of Lcobucci\JWT\Token instance
```

#### 2.0 usage

```php
<?php

use Kreait\Firebase\JWT\CustomTokenGenerator;

$generator = CustomTokenGenerator::withClientEmailAndPrivateKey($clientEmail, $privateKey);
$token = $generator->createCustomToken($uid, $claims);
// Returns an instance of Kreait\Firebase\JWT\Contracts\Token
```

### ID Token Verifier

Replace usages of `Firebase\Auth\Token\Verifier` with `Kreait\Firebase\JWT\IdTokenVerifier`:

#### 1.x usage

```php
<?php

use Firebase\Auth\Token\Verifier;

$verifier = new Verifier($projectId);

try {
    $verifiedIdToken = $verifier->verifyIdToken($idToken);
    
    echo $verifiedIdToken->getClaim('sub'); // "a-uid"
} catch (\Firebase\Auth\Token\Exception\ExpiredToken $e) {
    echo $e->getMessage();
} catch (\Firebase\Auth\Token\Exception\IssuedInTheFuture $e) {
    echo $e->getMessage();
} catch (\Firebase\Auth\Token\Exception\InvalidToken $e) {
    echo $e->getMessage();
}
```

#### 2.0 usage

```php
<?php

use Kreait\Firebase\JWT\Error\IdTokenVerificationFailed;
use Kreait\Firebase\JWT\IdTokenVerifier;

$verifier = IdTokenVerifier::createWithProjectId($projectId);

try {
    $verifier->verifyIdToken('header.payload.signature');
} catch (IdTokenVerificationFailed $e) {
    echo $e->getMessage();
    // Example Output:
    // The value 'idTokenString' is not a verified ID token:
    // - The token is invalid.
    // - Wrong number of segments
}
```