24 lines
734 B
PHP
24 lines
734 B
PHP
<?php
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require_once __DIR__ . '/../config.php';
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session_start_safe();
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$verifier = rtrim(strtr(base64_encode(random_bytes(32)), '+/', '-_'), '=');
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$challenge = rtrim(strtr(base64_encode(hash('sha256', $verifier, true)), '+/', '-_'), '=');
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$state = bin2hex(random_bytes(16));
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$_SESSION['pkce_verifier'] = $verifier;
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$_SESSION['oauth_state'] = $state;
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$_SESSION['oauth_return'] = null;
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$params = http_build_query([
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'response_type' => 'code',
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'client_id' => CLIENT_ID,
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'redirect_uri' => REDIRECT_URI,
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'state' => $state,
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'code_challenge' => $challenge,
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'code_challenge_method' => 'S256',
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]);
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header('Location: ' . AUTHORIZE_URI . '?' . $params);
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exit;
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