1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
import * as fs from 'node:fs';
import { Inject, Injectable } from '@nestjs/common';
import Koa from 'koa';
import cors from '@koa/cors';
import Router from '@koa/router';
import sharp from 'sharp';
import { DI } from '@/di-symbols.js';
import { 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 {
#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);
}
public createServer() {
const app = new Koa();
app.use(cors());
app.use(async (ctx, next) => {
ctx.set('Content-Security-Policy', 'default-src \'none\'; img-src \'self\'; media-src \'self\'; style-src \'unsafe-inline\'');
await next();
});
// Init router
const router = new Router();
router.get('/:url*', ctx => this.#handler(ctx));
// Register router
app.use(router.routes());
return app;
}
async #handler(ctx: Koa.Context) {
const url = 'url' in ctx.query ? ctx.query.url : 'https://' + ctx.params.url;
if (typeof url !== 'string') {
ctx.status = 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 ctx.query && isConvertibleImage) {
image = await this.imageProcessingService.convertToWebp(path, 498, 280);
} else if ('preview' in ctx.query && isConvertibleImage) {
image = await this.imageProcessingService.convertToWebp(path, 200, 200);
} else if ('badge' in ctx.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,
};
}
ctx.set('Content-Type', image.type);
ctx.set('Cache-Control', 'max-age=31536000, immutable');
ctx.body = image.data;
} catch (err) {
this.#logger.error(`${err}`);
if (err instanceof StatusError && (err.statusCode === 302 || err.isClientError)) {
ctx.status = err.statusCode;
} else {
ctx.status = 500;
}
} finally {
cleanup();
}
}
}
|
