add JPG preview generation for pages and update routing logic

2026-05-17 21:04:49 +02:00
parent f8c10c9d53
commit ed7eeda24c
4 changed files with 179 additions and 21 deletions
--- a/web/generator.php
+++ b/web/generator.php
@@ -4,6 +4,100 @@ declare(strict_types=1);

 require_once __DIR__ . '/../vendor/autoload.php';

+/**
+ * Render a JPG preview for a generated page using a local headless browser.
+ */
+function renderPagePreview(string $seed, string $htmlFilePath): void
+{
+    $previewDir = __DIR__ . '/previews';
+    if (! is_dir($previewDir)) {
+        mkdir($previewDir, 0775, true);
+    }
+
+    $realHtmlPath = realpath($htmlFilePath);
+    if ($realHtmlPath === false) {
+        return;
+    }
+
+    $pageUrl = 'file://' . $realHtmlPath;
+    $previewPngPath = $previewDir . '/' . $seed . '.png';
+    $previewJpgPath = $previewDir . '/' . $seed . '.jpg';
+
+    $browserCandidates = [
+        '/usr/bin/google-chrome',
+        '/usr/bin/google-chrome-stable',
+        '/usr/bin/chromium',
+        '/usr/bin/chromium-browser',
+        'google-chrome',
+        'google-chrome-stable',
+        'chromium',
+        'chromium-browser',
+    ];
+    $browserBinary = null;
+
+    foreach ($browserCandidates as $candidate) {
+        $candidatePath = null;
+
+        if (str_starts_with($candidate, '/')) {
+            if (! is_executable($candidate)) {
+                continue;
+            }
+            $candidatePath = $candidate;
+        } else {
+            $pathOut = [];
+            $pathExitCode = 1;
+            exec('command -v ' . escapeshellarg($candidate) . ' 2>/dev/null', $pathOut, $pathExitCode);
+            if ($pathExitCode !== 0 || ! isset($pathOut[0]) || $pathOut[0] === '') {
+                continue;
+            }
+            $candidatePath = $pathOut[0];
+        }
+
+        $versionOut = [];
+        $versionExitCode = 1;
+        exec(escapeshellarg($candidatePath) . ' --version 2>/dev/null', $versionOut, $versionExitCode);
+        if ($versionExitCode === 0) {
+            $browserBinary = $candidatePath;
+            break;
+        }
+    }
+
+    if ($browserBinary === null) {
+        return;
+    }
+
+    $command = sprintf(
+        '%s --headless --disable-gpu --no-sandbox --disable-dev-shm-usage --hide-scrollbars --window-size=1440,900 --screenshot=%s --virtual-time-budget=8000 --run-all-compositor-stages-before-draw %s 2>/dev/null',
+        escapeshellarg($browserBinary),
+        escapeshellarg($previewPngPath),
+        escapeshellarg($pageUrl)
+    );
+
+    $output = [];
+    $exitCode = 1;
+    exec($command, $output, $exitCode);
+
+    if ($exitCode !== 0 || ! file_exists($previewPngPath)) {
+        @unlink($previewPngPath);
+        return;
+    }
+
+    if (function_exists('imagecreatefrompng') && function_exists('imagejpeg')) {
+        $image = @imagecreatefrompng($previewPngPath);
+        if ($image !== false) {
+            imagejpeg($image, $previewJpgPath, 85);
+            imagedestroy($image);
+        }
+    }
+
+    if (file_exists($previewJpgPath)) {
+        @unlink($previewPngPath);
+    } else {
+        // Keep PNG as fallback if JPG conversion is unavailable.
+        @rename($previewPngPath, $previewJpgPath);
+    }
+}
+
 header('Content-Type: text/html; charset=UTF-8');

 $startedAt = microtime(true);
@@ -138,7 +232,9 @@ try {

    //echo $html;

-    file_put_contents(__DIR__ . '/../pages/' . $seed . '.html', $html);
+    $htmlPath = __DIR__ . '/../pages/' . $seed . '.html';
+    file_put_contents($htmlPath, $html);
+    renderPagePreview($seed, $htmlPath);
    
 } catch (Throwable $e) {
    http_response_code(500);