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import { Inject, Injectable } from '@nestjs/common';
import sharp from 'sharp';
import { DI } from '@/di-symbols.js';
import type { Config } from '@/config.js';
export type IImage = {
data: Buffer;
ext: string | null;
type: string;
};
@Injectable()
export class ImageProcessingService {
constructor(
@Inject(DI.config)
private config: Config,
) {
}
/**
* Convert to JPEG
* with resize, remove metadata, resolve orientation, stop animation
*/
public async convertToJpeg(path: string, width: number, height: number): Promise<IImage> {
return this.convertSharpToJpeg(await sharp(path), width, height);
}
public async convertSharpToJpeg(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true,
})
.rotate()
.jpeg({
quality: 85,
progressive: true,
})
.toBuffer();
return {
data,
ext: 'jpg',
type: 'image/jpeg',
};
}
/**
* Convert to WebP
* with resize, remove metadata, resolve orientation, stop animation
*/
public async convertToWebp(path: string, width: number, height: number, quality = 85): Promise<IImage> {
return this.convertSharpToWebp(await sharp(path), width, height, quality);
}
public async convertSharpToWebp(sharp: sharp.Sharp, width: number, height: number, quality = 85): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true,
})
.rotate()
.webp({
quality,
})
.toBuffer();
return {
data,
ext: 'webp',
type: 'image/webp',
};
}
/**
* Convert to PNG
* with resize, remove metadata, resolve orientation, stop animation
*/
public async convertToPng(path: string, width: number, height: number): Promise<IImage> {
return this.convertSharpToPng(await sharp(path), width, height);
}
public async convertSharpToPng(sharp: sharp.Sharp, width: number, height: number): Promise<IImage> {
const data = await sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true,
})
.rotate()
.png()
.toBuffer();
return {
data,
ext: 'png',
type: 'image/png',
};
}
}
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