refactor: ♻️ Rewrite media management code

classes/media/preprocessors/blurhash.ts

@@ -0,0 +1,45 @@
+import { encode } from "blurhash";
+import sharp from "sharp";
+import type { MediaPreprocessor } from "./media-preprocessor";
+
+export class BlurhashPreprocessor implements MediaPreprocessor {
+    public async process(
+        file: File,
+    ): Promise<{ file: File; blurhash: string | null }> {
+        try {
+            const arrayBuffer = await file.arrayBuffer();
+            const metadata = await sharp(arrayBuffer).metadata();
+
+            const blurhash = await new Promise<string | null>((resolve) => {
+                (async () =>
+                    sharp(arrayBuffer)
+                        .raw()
+                        .ensureAlpha()
+                        .toBuffer((err, buffer) => {
+                            if (err) {
+                                resolve(null);
+                                return;
+                            }
+
+                            try {
+                                resolve(
+                                    encode(
+                                        new Uint8ClampedArray(buffer),
+                                        metadata?.width ?? 0,
+                                        metadata?.height ?? 0,
+                                        4,
+                                        4,
+                                    ) as string,
+                                );
+                            } catch {
+                                resolve(null);
+                            }
+                        }))();
+            });
+
+            return { file, blurhash };
+        } catch {
+            return { file, blurhash: null };
+        }
+    }
+}