userscripts/oauth.html at main · scharinger/userscripts · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>OAuth Redirect</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            padding: 20px;
            text-align: center;
            background: #f5f5f5;
        }
        .container {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            max-width: 400px;
            margin: 50px auto;
        }
        .success {
            color: #28a745;
        }
        .error {
            color: #dc3545;
        }
        .version {
            font-size: 13px;
            color: #666;
            margin-top: 6px;
        }
    </style>
</head>
<body>
    <div class="container">
        <h2>OAuth Authorization</h2>
        <div id="version" class="version">Version: v2</div>
        <div id="status">Processing authorization...</div>
    </div>

    <script>
        (function() {
            const statusDiv = document.getElementById('status');
            const versionDiv = document.getElementById('version');
            // DRY constants
            const VERSION = '4';
            const CLOSE_DELAY_MS = 200; // how long the success message is shown before window.close()
            // Centralized visible text so the body content is DRY and easy to change
            const TEXTS = {
                TITLE: 'OAuth Authorization',
                PROCESSING: 'Processing authorization...',
                SUCCESS: '✓ Authorization successful!<br>You can close this window.',
                ERROR_PREFIX: '✗ Authorization failed:<br>',
                NO_DATA: '✗ No authorization data received',
                ERROR_PROCESS: '✗ Error processing authorization:<br>'
            };
            // Set version from the constant (no runtime fetch)
            try { if (versionDiv) versionDiv.textContent = 'Version: v' + VERSION; } catch(_) {}

            // Use TEXTS to populate the page content (DRY)
            try {
                const titleEl = document.querySelector('.container h2');
                if (titleEl) titleEl.textContent = TEXTS.TITLE;
                if (statusDiv) statusDiv.innerHTML = TEXTS.PROCESSING;
            } catch(_) {}

            try {
                // Parse URL fragment for access_token
                const hash = window.location.hash.substring(1);
                const params = new URLSearchParams(hash);

                const accessToken = params.get('access_token');
                const error = params.get('error');

                if (accessToken) {
                    statusDiv.innerHTML = '<div class="success">' + TEXTS.SUCCESS + '</div>';

                    // Send token back to parent window
                    if (window.opener) {
                        window.opener.postMessage({
                            access_token: accessToken,
                            expires_in: params.get('expires_in'),
                            token_type: params.get('token_type')
                        }, '*');
                    }

                        // Close after a brief delay (configured above)
                        setTimeout(() => {
                            try { window.close(); } catch(_) {}
                        }, CLOSE_DELAY_MS);

                } else if (error) {
                    statusDiv.innerHTML = '<div class="error">' + TEXTS.ERROR_PREFIX + error + '</div>';

                    if (window.opener) {
                        window.opener.postMessage({
                            error: error,
                            error_description: params.get('error_description')
                        }, '*');
                    }

                } else {
                    statusDiv.innerHTML = '<div class="error">' + TEXTS.NO_DATA + '</div>';

                    if (window.opener) {
                        window.opener.postMessage({
                            error: 'no_token_received'
                        }, '*');
                    }
                }

        } catch (e) {
            statusDiv.innerHTML = '<div class="error">' + TEXTS.ERROR_PROCESS + e.message + '</div>';

                if (window.opener) {
                    window.opener.postMessage({
                        error: 'processing_error',
                        error_description: e.message
                    }, '*');
                }
            }
        })();
    </script>
</body>
</html>