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smartCropImage.ts
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smartCropImage.ts
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import { CropResult } from "./../types/cacheManager";
import sharp from "sharp";
import smartcrop from "smartcrop-sharp";
import { Buffer } from "buffer";
import fs from "fs/promises";
import { randomBytes } from "crypto";
import { CacheManager } from "./cache/CacheManager";
import { ImageInfoTool } from "./ImageInfoTool";
import { SmartCropOptions, DirectCropOptions } from "../types/smartCropImage";
import { CropDescription } from "../types/imageRouter";
import { format_specific_options } from "../format-specific-options";
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 getSmartCropResult(
hash: string,
options: SmartCropOptions | DirectCropOptions
): Promise<CropResult> {
const src = ImageInfoTool.getImageData(hash).originalPath;
const result = await smartcrop.crop(src, {
width: options.width,
height: options.height,
});
return result;
}
async function applyCrop(
context: CacheManager,
hash: string,
tmp_path: string,
resolution: number,
options: Exclude<CropDescription, false>,
fileExtension: string
): Promise<Buffer> {
const src = ImageInfoTool.getImageData(hash).originalPath;
if (isDirectCropOptions(options)) {
const { width, height, x, y } = options;
let image = sharp(src)
.extract({ left: x, top: y, width, height })
.resize({ width: resolution });
const apply_options = format_specific_options[fileExtension];
if (apply_options) {
image = apply_options(image);
}
const croppedImageBuffer = image.toBuffer();
return croppedImageBuffer;
} else if (isSmartCropOptions(options)) {
const cropResult = await context.cachedGetSmarctopAnalysisResult({
hash: hash,
cropData: options,
});
const randomBytesString = randomBytes(16).toString("hex");
const tempDest = `${tmp_path}.${randomBytesString}.cropped.${fileExtension}`;
let image = sharp(src)
.extract({
left: cropResult.topCrop.x,
top: cropResult.topCrop.y,
width: cropResult.topCrop.width,
height: cropResult.topCrop.height,
})
.resize({ width: resolution });
const apply_options = format_specific_options[fileExtension];
if (apply_options) {
image = apply_options(image);
}
await image.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,
getSmartCropResult,
};

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smartCropImage.ts (2 KB)

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