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import * as fs from 'node:fs';
import { Inject, Injectable } from '@nestjs/common';
import { FastifyInstance, FastifyPluginOptions, FastifyReply, FastifyRequest } from 'fastify';
import sharp from 'sharp';
import { DI } from '@/di-symbols.js';
import type { Config } from '@/config.js';
import { isMimeImage } from '@/misc/is-mime-image.js';
import { createTemp } from '@/misc/create-temp.js';
import { DownloadService } from '@/core/DownloadService.js';
import { ImageProcessingService } from '@/core/ImageProcessingService.js';
import type { IImage } from '@/core/ImageProcessingService.js';
import { FILE_TYPE_BROWSERSAFE } from '@/const.js';
import { StatusError } from '@/misc/status-error.js';
import type Logger from '@/logger.js';
import { FileInfoService } from '@/core/FileInfoService.js';
import { LoggerService } from '@/core/LoggerService.js';
@Injectable()
export class MediaProxyServerService {
private logger: Logger;
constructor(
@Inject(DI.config)
private config: Config,
private fileInfoService: FileInfoService,
private downloadService: DownloadService,
private imageProcessingService: ImageProcessingService,
private loggerService: LoggerService,
) {
this.logger = this.loggerService.getLogger('server', 'gray', false);
this.createServer = this.createServer.bind(this);
}
public createServer(fastify: FastifyInstance, options: FastifyPluginOptions, done: (err?: Error) => void) {
fastify.addHook('onRequest', (request, reply, done) => {
reply.header('Content-Security-Policy', 'default-src \'none\'; img-src \'self\'; media-src \'self\'; style-src \'unsafe-inline\'');
done();
});
fastify.get<{
Params: { url: string; };
Querystring: { url?: string; };
}>('/:url*', async (request, reply) => await this.handler(request, reply));
done();
}
private async handler(request: FastifyRequest<{ Params: { url: string; }; Querystring: { url?: string; }; }>, reply: FastifyReply) {
const url = 'url' in request.query ? request.query.url : 'https://' + request.params.url;
if (typeof url !== 'string') {
reply.code(400);
return;
}
// Create temp file
const [path, cleanup] = await createTemp();
try {
await this.downloadService.downloadUrl(url, path);
const { mime, ext } = await this.fileInfoService.detectType(path);
const isConvertibleImage = isMimeImage(mime, 'sharp-convertible-image');
let image: IImage;
if ('static' in request.query && isConvertibleImage) {
image = await this.imageProcessingService.convertToWebp(path, 498, 280);
} else if ('preview' in request.query && isConvertibleImage) {
image = await this.imageProcessingService.convertToWebp(path, 200, 200);
} else if ('badge' in request.query) {
if (!isConvertibleImage) {
// 画像でないなら404でお茶を濁す
throw new StatusError('Unexpected mime', 404);
}
const mask = sharp(path)
.resize(96, 96, {
fit: 'inside',
withoutEnlargement: false,
})
.greyscale()
.normalise()
.linear(1.75, -(128 * 1.75) + 128) // 1.75x contrast
.flatten({ background: '#000' })
.toColorspace('b-w');
const stats = await mask.clone().stats();
if (stats.entropy < 0.1) {
// エントロピーがあまりない場合は404にする
throw new StatusError('Skip to provide badge', 404);
}
const data = sharp({
create: { width: 96, height: 96, channels: 4, background: { r: 0, g: 0, b: 0, alpha: 0 } },
})
.pipelineColorspace('b-w')
.boolean(await mask.png().toBuffer(), 'eor');
image = {
data: await data.png().toBuffer(),
ext: 'png',
type: 'image/png',
};
} else if (mime === 'image/svg+xml') {
image = await this.imageProcessingService.convertToWebp(path, 2048, 2048, 1);
} else if (!mime.startsWith('image/') || !FILE_TYPE_BROWSERSAFE.includes(mime)) {
throw new StatusError('Rejected type', 403, 'Rejected type');
} else {
image = {
data: fs.readFileSync(path),
ext,
type: mime,
};
}
reply.header('Content-Type', image.type);
reply.header('Cache-Control', 'max-age=31536000, immutable');
return image.data;
} catch (err) {
this.logger.error(`${err}`);
if (err instanceof StatusError && (err.statusCode === 302 || err.isClientError)) {
reply.code(err.statusCode);
} else {
reply.code(500);
}
} finally {
cleanup();
}
}
}
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