First commit. Implement a very basic CDN server to serve and resize images

src/Lib/ImageDb.php

@@ -0,0 +1,19 @@
+<?php
+declare(strict_types=1);
+
+
+namespace ImageResizer\Lib;
+
+use ImageResizer\Models\Image;
+use ImageResizer\Models\ResizeParams;
+
+interface ImageDb
+{
+    public function findImage(string $path, ResizeParams $params): Image|null;
+
+    public function saveImage(
+        string       $path,
+        ResizeParams $params,
+        string       $content,
+    ): void;
+}

src/Lib/Resizer.php

@@ -0,0 +1,55 @@
+<?php
+declare(strict_types=1);
+
+
+namespace ImageResizer\Lib;
+
+use ImageResizer\Models\ResizeParams;
+use ImageResizer\Models\Image;
+class Resizer
+{
+    public function __construct(
+        private readonly ImageDb $imageDb
+    )
+    {}
+
+    /**
+     * @throws \Exception
+     */
+    public function performResize(string $path, ResizeParams $params)
+    {
+        // Check if the image has already been processed
+        if ($image = $this->imageDb->findImage($path, $params)) {
+
+            header("Content-type: {${$image->getMime()}}");
+            return base64_decode($image->encode(75));
+        }
+
+        // Fetch the image at the given URL
+        $original_img = Image::fromUrl($_ENV['root_domain'] . $path);
+        $converted = $this->createVariant($original_img, $params);
+
+        // Store the image in the database
+        $this->imageDb->saveImage(
+            $path,
+            $params,
+            $converted
+        );
+
+        header("Content-type: {$original_img->getMime()}");
+        return base64_decode($converted);
+    }
+
+    private function createVariant(Image $original, ResizeParams $params): string
+    {
+        $quality = $params->quality ?: -1;
+
+        if ($params->width) {
+            $original->toWidth($params->width);
+        }
+
+        return $original->encode($quality);
+    }
+
+
+}

src/Lib/SqliteImageDb.php

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+<?php
+declare(strict_types=1);
+
+namespace ImageResizer\Lib;
+
+use ImageResizer\Models\Image;
+use ImageResizer\Models\ResizeParams;
+
+class SqliteImageDb implements ImageDb {
+    public function __construct(
+        private readonly \PDO $db
+    ) {
+        $this->up();
+    }
+
+    private function up() {
+        $this->db->exec('CREATE TABLE IF NOT EXISTS images (
+            id INTEGER PRIMARY KEY,
+            path TEXT NOT NULL,
+            width INTEGER NULLABLE,
+            height INTEGER NULLABLE,
+            quality INTEGER NULLABLE,
+            content TEXT NOT NULL
+        )');
+    }
+
+    public function findImage(string $path, ResizeParams $params): Image | null {
+        $stmt = $this->db->prepare('SELECT * FROM images WHERE path = :path AND width = :width AND height = :height AND quality = :quality');
+        $stmt->execute([
+            ':path' => $path,
+            ':width' => $params->width,
+            ':height' => $params->height,
+            ':quality' => $params->quality
+        ]);
+
+        $result = $stmt->fetchObject();
+
+        return $result ? Image::fromString(base64_decode($result->content)) : null;
+    }
+
+    public function saveImage(
+        string $path,
+        ResizeParams $params,
+        string $content,
+    ): void {
+        $stmt = $this->db->prepare("INSERT INTO images (path, width, height, quality, content) VALUES (:path, :width, :height, :quality, :content)"
+);
+        $stmt->execute([
+            ':path' => $path,
+            ':width' => $params->width,
+            ':height' => $params->height,
+            ':quality' => $params->quality,
+            ':content' => $content
+        ]);
+    }
+}