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<?php
declare(strict_types=1);
namespace TCB;
use TCB\Credentials;
use TCB\HttpServer;
use TCB\Request;
use TCB\Response;
use TCB\TokenStorage;
final class TokenManager
{
private string $authorisationCode;
public function __construct(
private readonly Credentials $credentials,
private readonly HttpServer $httpServer,
private readonly TokenStorage $storage,
) {}
public function getAccessToken(): string
{
if ($this->storage->accessToken === '' || $this->storage->refreshToken === '') {
$this->authorise();
$this->requestAccessToken();
}
if ($this->storage->expiresOn < time()) {
$this->refreshAccessToken();
}
return $this->storage->accessToken;
}
private function authorise(): void
{
$this->authorisationCode = '';
$this->httpServer->get(
'/callback',
function (Request $request, HttpServer $server): Response {
$server->closeAfterResponse();
if (
!array_key_exists('state', $request->params)
|| $request->params['state'] !== $this->credentials->state
) {
$body = 'State mismatch.';
} elseif (array_key_exists('error', $request->params)) {
$body = "Error from Spotify: {$request->params['error']}";
} elseif (!array_key_exists('code', $request->params)) {
$body = "Missing authorisation code from Spotify.";
} else {
$this->authorisationCode = $request->params['code'];
$body = 'Authorisation code received from Spotify. You can close this page and go back to the terminal.';
}
return new Response(
statusCode: 200,
contentType: 'text/plain; charset=UTF-8',
body: htmlspecialchars($body, ENT_QUOTES),
);
},
);
$query = http_build_query([
'response_type' => 'code',
'client_id' => $this->credentials->clientID,
'redirect_uri' => $this->credentials->redirectURI,
'state' => $this->credentials->state,
'scope' => 'playlist-read-private',
'show_dialog' => false,
]);
echo "Visit the below URL in your browser to authorise access to Spotify.\n";
echo "https://accounts.spotify.com/authorize?$query\n";
echo "Waiting for authorisation from Spotify...\n";
$this->httpServer->run();
if ($this->authorisationCode === '') {
echo "Failed to get authorisation code from Spotify.\n";
exit(1);
}
}
private function requestAccessToken(): void
{
echo "Requesting an access token from Spotify.\n";
$ch = curl_init();
curl_setopt_array($ch, [
CURLOPT_URL => 'https://accounts.spotify.com/api/token',
CURLOPT_POST => true,
CURLOPT_HTTPHEADER => [
'Authorization: Basic ' . base64_encode($this->credentials->clientID . ':' . $this->credentials->clientSecret),
'Content-Type: application/x-www-form-urlencoded',
],
CURLOPT_POSTFIELDS => http_build_query([
'grant_type' => 'authorization_code',
'code' => $this->authorisationCode,
'redirect_uri' => $this->credentials->redirectURI,
]),
CURLOPT_RETURNTRANSFER => true,
]);
$response = curl_exec($ch);
$statusCode = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
if ($statusCode !== 200) {
echo "Non 200 response from Spotify: $statusCode $response\n";
exit(1);
}
$data = json_decode($response, true) ?? [];
$accessToken = $data['access_token'] ?? '';
$refreshToken = $data['refresh_token'] ?? '';
$expiresIn = $data['expires_in'] ?? 0;
if ($accessToken === '' || $refreshToken === '') {
echo "Failed to get access token from Spotify.\n";
exit(1);
}
$this->storage->accessToken = $accessToken;
$this->storage->refreshToken = $refreshToken;
$this->storage->expiresOn = time() + $expiresIn;
$this->storage->save();
}
private function refreshAccessToken(): void
{
echo "Refreshing the Spotify access token.\n";
$ch = curl_init();
curl_setopt_array($ch, [
CURLOPT_URL => 'https://accounts.spotify.com/api/token',
CURLOPT_POST => true,
CURLOPT_HTTPHEADER => [
'Authorization: Basic ' . base64_encode($this->credentials->clientID . ':' . $this->credentials->clientSecret),
'Content-Type: application/x-www-form-urlencoded',
],
CURLOPT_POSTFIELDS => http_build_query([
'grant_type' => 'refresh_token',
'refresh_token' => $this->storage->refreshToken,
]),
CURLOPT_RETURNTRANSFER => true,
]);
$response = curl_exec($ch);
$statusCode = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
if ($statusCode !== 200) {
echo "Non 200 response from Spotify: $statusCode $response\n";
exit(1);
}
$data = json_decode($response, true) ?? [];
$accessToken = $data['access_token'] ?? '';
$refreshToken = $data['refresh_token'] ?? $this->storage->refreshToken;
$expiresIn = $data['expires_in'] ?? 0;
if ($accessToken === '' || $refreshToken === '') {
echo "Failed to refresh the Spotify access token.\n";
exit(1);
}
$this->storage->accessToken = $accessToken;
$this->storage->refreshToken = $refreshToken;
$this->storage->expiresOn = time() + $expiresIn;
$this->storage->save();
}
}
|
