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Add reddit-to-redlib.html
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@mshibanami
mshibanami committed Oct 21, 2024
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<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Reddit → Redlib</title>
<style>
body {
font-family: Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
text-align: center;
}

.container {
max-width: 600px;
margin: 0 auto;
}

#status {
margin: 20px 0;
padding: 10px;
border-radius: 4px;
}

.loading {
background-color: #fff3cd;
color: #856404;
}

.error {
background-color: #f8d7da;
color: #721c24;
}

.success {
background-color: #d4edda;
color: #155724;
}

#spinner {
display: none;
width: 20px;
height: 20px;
border: 3px solid #f3f3f3;
border-top: 3px solid #3498db;
border-radius: 50%;
animation: spin 1s linear infinite;
margin-right: 10px;
}

@keyframes spin {
0% {
transform: rotate(0deg);
}

100% {
transform: rotate(360deg);
}
}

.loading #spinner {
display: inline-block;
}

.info {
background-color: #e9ecef;
padding: 20px;
border-radius: 8px;
margin: 20px 0;
text-align: left;
}

.info h2 {
margin-top: 0;
color: #495057;
}

.info ul {
margin: 0;
padding-left: 20px;
}

.info li {
margin: 8px 0;
}

.example {
background-color: #f8f9fa;
padding: 10px;
border-radius: 4px;
font-family: monospace;
word-break: break-all;
}

.footer {
margin-top: 40px;
font-size: 0.9em;
color: #6c757d;
}

.hidden {
display: none;
}

#cache-status {
font-size: 0.9em;
color: #6c757d;
margin-top: 10px;
}
</style>
</head>

<body>
<div class="container">
<h1>Reddit → Redlib</h1>

<div class="info">
<h2>About</h2>
<p>This tool automatically redirects Reddit links to available Redlib instances. Redlib is a private
front-end for Reddit that doesn't require JavaScript to work.</p>

<h2>How to Use</h2>
<ul>
<li>Add your Reddit URL as a parameter to this page using <code>?url=</code></li>
<li>The redirector will find an available Redlib instance and redirect you there</li>
<li>Previously working instances are cached and prioritized for faster access</li>
</ul>

<h2>Example</h2>
<p>To visit r/privacy on Redlib, use:</p>
<div class="example">
<span id="current-domain">reddit-redirector.html</span>?url=https://reddit.com/r/privacy
</div>
</div>

<div id="status">
<div id="spinner"></div>
<span id="status-text"></span>
</div>
<div id="cache-status"></div>

<div class="footer">
<p>Source code available on <a href="https://github.com/mshibanami/redirect-web" target="_blank">GitHub</a>
</p>
</div>
</div>

<script>
const INSTANCES_URL = 'https://raw.githubusercontent.com/redlib-org/redlib-instances/refs/heads/main/instances.json';
const STATUS_TIMEOUT = 3000;
const CACHE_KEY = 'redlib_working_instances';
const CACHE_EXPIRY = 24 * 60 * 60 * 1000; // 24 hours

// Update the example URL with the current domain
document.getElementById('current-domain').textContent = window.location.href.split('?')[0];

// Cache management functions
function getCachedInstances() {
try {
const cached = localStorage.getItem(CACHE_KEY);
if (!cached) return null;

const { instances, timestamp } = JSON.parse(cached);

// Check if cache is expired
if (Date.now() - timestamp > CACHE_EXPIRY) {
localStorage.removeItem(CACHE_KEY);
return null;
}

return instances;
} catch (error) {
console.error('Cache read error:', error);
return null;
}
}

function cacheWorkingInstance(instance) {
try {
const existingCache = getCachedInstances() || [];
const newCache = [
instance,
...existingCache.filter(i => i.url !== instance.url)
].slice(0, 5); // Keep only the 5 most recent working instances

localStorage.setItem(CACHE_KEY, JSON.stringify({
instances: newCache,
timestamp: Date.now()
}));
} catch (error) {
console.error('Cache write error:', error);
}
}

function checkInstanceAvailability(instance) {
return new Promise((resolve) => {
const img = new Image();
const timeout = setTimeout(() => {
img.src = '';
resolve(false);
}, STATUS_TIMEOUT);

img.onload = () => {
clearTimeout(timeout);
resolve(true);
};

img.onerror = () => {
clearTimeout(timeout);
resolve(false);
};

img.src = `${instance.url}/favicon.ico`;
});
}

function convertRedditUrl(redlibUrl, redditUrl) {
try {
const url = new URL(redditUrl);
if (!url.hostname.includes('reddit.com')) {
throw new Error('Not a Reddit URL');
}
return redlibUrl + url.pathname + url.search + url.hash;
} catch (error) {
return null;
}
}

async function findWorkingInstance(allInstances) {
// Randomize instance order to distribute load evenly
const shuffledInstances = allInstances.sort(() => Math.random() - 0.5);

// First check cached instances
const cachedInstances = getCachedInstances();
if (cachedInstances?.length > 0) {
document.getElementById('cache-status').textContent = 'Checking cached instances...';

for (const instance of cachedInstances) {
const isAvailable = await checkInstanceAvailability(instance);
if (isAvailable) {
document.getElementById('cache-status').textContent = 'Using cached instance';
return instance;
}
}

document.getElementById('cache-status').textContent = 'Cached instances unavailable, checking others...';
}

// Filter out cached instances from all instances to avoid duplicate checks
const remainingInstances = shuffledInstances.filter(instance =>
!cachedInstances?.some(cached => cached.url === instance.url)
);

// Check remaining instances sequentially to avoid the issue of race conditions
for (const instance of remainingInstances) {
const isAvailable = await checkInstanceAvailability(instance);
if (isAvailable) {
cacheWorkingInstance(instance);
document.getElementById('cache-status').textContent = 'New working instance found and cached';
return instance;
}
}

document.getElementById('cache-status').textContent = '';
return null;
}

function updateStatus(type, message) {
const statusEl = document.getElementById('status');
const statusTextEl = document.getElementById('status-text');
statusEl.className = type;
statusTextEl.textContent = message;
}

async function init() {
const urlParams = new URLSearchParams(window.location.search);
const redditUrl = urlParams.get('url');
const decodedRedditUrl = redditUrl ? decodeURIComponent(redditUrl) : null;

if (!redditUrl) {
updateStatus('error', 'No URL parameter provided. See usage instructions above.');
document.getElementById('cache-status').textContent = '';
return;
}

try {
updateStatus('loading', 'Checking for available instances...');

const response = await fetch(INSTANCES_URL);
const data = await response.json();

const workingInstance = await findWorkingInstance(data.instances);

if (!decodedRedditUrl) {
throw new Error('Invalid or malformed Reddit URL.');
}

if (!workingInstance) {
throw new Error('No available instances found. Please try again later.');
}

const redirectUrl = convertRedditUrl(workingInstance.url, decodedRedditUrl);
if (!redirectUrl) {
throw new Error('Invalid Reddit URL.');
}

updateStatus('success', `Redirecting to ${workingInstance.url}...`);

setTimeout(() => {
window.location.href = redirectUrl;
}, 1000);

} catch (error) {
updateStatus('error', error.message);
document.getElementById('cache-status').textContent = '';
}
}

init();
</script>
</body>

</html>

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