ImageInfoTool.ts
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ImageInfoTool.ts
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	import sharp from "sharp";
	import { ImageData } from "../types/imageRouter";

	export const ImageInfoTool = new (class {
	hashToImageData: Record<string, ImageData> = {};

	public getImageData(hash: string): ImageData {
	if (this.hashToImageData[hash]) {
	return this.hashToImageData[hash];
	}
	this.initImageData(hash);
	return this.hashToImageData[hash];
	}

	public initImageData(hash: string) {
	this.hashToImageData[hash] = {
	resolutions: [],
	lossless: false,
	metadata: undefined,
	originalPath: "",
	targetRatio: 0,
	ratioDiffThreshold: 0,
	container: {
	objectFit: "",
	width: 0,
	height: 0,
	},
	crop: undefined,
	thumbnailSize: 0,
	};
	}

	public consoleLogError(hash: string) {
	console.error(`Hash ${hash} not found in hashToImageData.`);
	}

	public updateProperty<K extends keyof ImageData>(
	hash: string,
	propertyName: K,
	param: ImageData[K]
	) {
	if (!this.hashToImageData[hash]) {
	this.consoleLogError(hash);
	return;
	}
	this.hashToImageData[hash][propertyName] = param;
	}

	public async getMetadata(hash: string): Promise<sharp.Metadata> {
	if (this.getImageData(hash).metadata) {
	return this.getImageData(hash).metadata as Promise<sharp.Metadata>;
	} else {
	const metadata: Promise<sharp.Metadata> = sharp(
	this.getImageData(hash).originalPath
	).metadata();
	this.updateProperty(hash, "metadata", metadata);
	return metadata;
	}
	}
	})();