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feat: add link preview when typing a link in description of a task #31

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Merged
mateocarciu merged 1 commit into from
Jun 18, 2026
Merged

feat: add link preview when typing a link in description of a task #31

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180 changes: 180 additions & 0 deletions app/Http/Controllers/Api/LinkPreviewController.php
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Original file line number Diff line number Diff line change
@@ -0,0 +1,180 @@
<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;

class LinkPreviewController extends Controller
{
public function show(Request $request)
{
$request->validate([
'url' => 'required|url',
]);

$url = $request->input('url');

$host = strtolower(parse_url($url, PHP_URL_HOST) ?? '');
$localHosts = ['localhost', '127.0.0.1', '127.0.0.2', '::1', strtolower(parse_url(config('app.url', ''), PHP_URL_HOST) ?? '')];

$serverHost = strtolower(parse_url($request->getSchemeAndHttpHost(), PHP_URL_HOST) ?? '');
if ($serverHost) {
$localHosts[] = $serverHost;
}

if (in_array($host, $localHosts)) {
return response()->json([
'url' => $url,
'title' => $host ?: 'Local Link',
'description' => 'Link to local page',
'image' => null,
'favicon' => asset('favicon.ico'),
]);
}

// Cache the preview for 24 hours
$cacheKey = 'link_preview_' . md5($url);

$data = Cache::remember($cacheKey, now()->addDay(), function () use ($url) {
try {
return $this->fetchPreviewData($url);
} catch (\Exception $e) {
// Cache the fallback response on failure to prevent repeated timeouts
// that could exhaust server workers if a link is dead.
return [
'url' => $url,
'title' => parse_url($url, PHP_URL_HOST),
'description' => 'Failed to fetch link preview',
'image' => null,
'favicon' => asset('favicon.ico'),
];
}
});

return response()->json($data);
}

private function fetchPreviewData(string $url): array
{
// Set short timeout to prevent blocking server threads
$response = Http::timeout(3)
->withHeaders([
'User-Agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
])
->get($url);

if (!$response->successful()) {
throw new \Exception('HTTP request failed with status ' . $response->status());
}

$contentType = $response->header('Content-Type', '');
if (strpos($contentType, 'text/html') === false) {
return [
'url' => $url,
'title' => basename($url) ?: parse_url($url, PHP_URL_HOST),
'description' => 'Link to file: ' . $contentType,
'image' => null,
'favicon' => asset('favicon.ico'),
];
}

$html = $response->body();

// Only parse the <head> section (or first 150KB) to save memory and CPU
$headEnd = stripos($html, '</head>');
if ($headEnd !== false) {
$html = substr($html, 0, $headEnd + 7);
} else {
$html = substr($html, 0, 150000);
}

// Parse HTML using DOMDocument
$doc = new \DOMDocument();
// Suppress HTML parsing warnings
@$doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'), LIBXML_NOERROR | LIBXML_NOWARNING);

$xpath = new \DOMXPath($doc);

// Extract metadata
$title = $this->getXpathContent($xpath, [
'//meta[@property="og:title"]/@content',
'//meta[@name="twitter:title"]/@content',
'//title',
]) ?: parse_url($url, PHP_URL_HOST);

$description = $this->getXpathContent($xpath, [
'//meta[@property="og:description"]/@content',
'//meta[@name="twitter:description"]/@content',
'//meta[@name="description"]/@content',
]);

$image = $this->getXpathContent($xpath, [
'//meta[@property="og:image"]/@content',
'//meta[@name="twitter:image"]/@content',
]);

$favicon = $this->getXpathContent($xpath, [
'//link[@rel="icon"]/@href',
'//link[@rel="shortcut icon"]/@href',
'//link[@rel="apple-touch-icon"]/@href',
]);

// Resolve relative paths to absolute URLs
if ($image) {
$image = $this->resolveUrl($image, $url);
}
if ($favicon) {
$favicon = $this->resolveUrl($favicon, $url);
} else {
$favicon = asset('favicon.ico');
}

return [
'url' => $url,
'title' => trim($title),
'description' => trim($description),
'image' => $image,
'favicon' => $favicon,
];
}

private function getXpathContent(\DOMXPath $xpath, array $queries): ?string
{
foreach ($queries as $query) {
$nodes = $xpath->query($query);
if ($nodes && $nodes->length > 0) {
return $nodes->item(0)->nodeValue;
}
}
return null;
}

private function resolveUrl(string $path, string $baseUrl): string
{
if (parse_url($path, PHP_URL_SCHEME) !== null) {
return $path;
}

$parts = parse_url($baseUrl);
$domain = $parts['scheme'] . '://' . $parts['host'] . (isset($parts['port']) ? ':' . $parts['port'] : '');

if (strpos($path, '//') === 0) {
return $parts['scheme'] . ':' . $path;
}

if (strpos($path, '/') === 0) {
return $domain . $path;
}

$basePath = isset($parts['path']) ? $parts['path'] : '/';
if (substr($basePath, -1) !== '/') {
$basePath = dirname($basePath) . '/';
}

return $domain . $basePath . $path;
}

}
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