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smartCropImage.ts
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smartCropImage.ts
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import sharp from "sharp";
import smartcrop from "smartcrop-sharp";
import { Buffer } from "buffer";
import fs from "fs/promises";
import { randomBytes } from "crypto";
type SmartCropOptions = {
width: number;
height: number;
};
type DirectCropOptions = SmartCropOptions & {
x: number;
y: number;
};
function isSmartCropOptions(
value: SmartCropOptions | DirectCropOptions
): value is SmartCropOptions {
return (
(value as DirectCropOptions).x === undefined &&
(value as DirectCropOptions).y === undefined
);
}
function isDirectCropOptions(
value: SmartCropOptions | DirectCropOptions
): value is DirectCropOptions {
return (
(value as DirectCropOptions).x !== undefined &&
(value as DirectCropOptions).y !== undefined
);
}
async function applyCrop(
src: string,
tmp_path: string,
resolution: number,
options: SmartCropOptions | DirectCropOptions
): Promise<Buffer> {
if (isDirectCropOptions(options)) {
const { width, height, x, y } = options;
const croppedImageBuffer = await sharp(src)
.extract({ left: x, top: y, width, height })
.resize({ width: resolution })
.toBuffer();
return croppedImageBuffer;
} else if (isSmartCropOptions(options)) {
const result = await smartcrop.crop(src, {
width: options.width,
height: options.height,
});
const crop = result.topCrop;
const randomBytesString = randomBytes(16).toString("hex");
const tempDest = `${tmp_path}.${randomBytesString}.cropped.jpeg`;
await sharp(src)
.extract({
left: crop.x,
top: crop.y,
width: crop.width,
height: crop.height,
})
.resize({ width: resolution })
.toFile(tempDest);
const croppedImageBuffer = await fs.readFile(tempDest);
await fs.unlink(tempDest);
return croppedImageBuffer;
} else {
throw new Error("Invalid cropping options provided");
}
}
export {
applyCrop,
SmartCropOptions,
DirectCropOptions,
isDirectCropOptions,
isSmartCropOptions,
};

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smartCropImage.ts (1 KB)

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