Begin work on media attachments

database/entities/Attachment.ts

@@ -0,0 +1,47 @@
+import { ConfigType } from "@config";
+import { Attachment } from "@prisma/client";
+import { APIAsyncAttachment } from "~types/entities/async_attachment";
+import { APIAttachment } from "~types/entities/attachment";
+
+export const attachmentToAPI = (
+	attachment: Attachment
+): APIAsyncAttachment | APIAttachment => {
+	let type = "unknown";
+
+	if (attachment.mime_type.startsWith("image/")) {
+		type = "image";
+	} else if (attachment.mime_type.startsWith("video/")) {
+		type = "video";
+	} else if (attachment.mime_type.startsWith("audio/")) {
+		type = "audio";
+	}
+
+	return {
+		id: attachment.id,
+		type: type as any,
+		url: attachment.url,
+		remote_url: attachment.remote_url,
+		preview_url: attachment.thumbnail_url,
+		text_url: null,
+		meta: {
+			width: attachment.width || undefined,
+			height: attachment.height || undefined,
+			fps: attachment.fps || undefined,
+			size: attachment.size?.toString() || undefined,
+			duration: attachment.duration || undefined,
+			length: attachment.size?.toString() || undefined,
+			// Idk whether size or length is the right value
+		},
+		description: attachment.description,
+		blurhash: attachment.blurhash,
+	};
+};
+
+export const getUrl = (hash: string, config: ConfigType) => {
+	if (config.media.backend === "local") {
+		return `${config.http.base_url}/media/${hash}`;
+	} else if (config.media.backend === "s3") {
+		return `${config.s3.public_url}/${hash}`;
+	}
+	return "";
+};