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/*
* SPDX-FileCopyrightText: syuilo and other misskey contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
import * as fs from 'node:fs';
import * as crypto from 'node:crypto';
import * as stream from 'node:stream/promises';
import { Injectable } from '@nestjs/common';
import * as fileType from 'file-type';
import isSvg from 'is-svg';
import probeImageSize from 'probe-image-size';
import sharp from 'sharp';
import { encode } from 'blurhash';
import { bindThis } from '@/decorators.js';
export type FileInfo = {
size: number;
md5: string;
type: {
mime: string;
ext: string | null;
};
width?: number;
height?: number;
orientation?: number;
blurhash?: string;
sensitive: boolean;
porn: boolean;
warnings: string[];
};
const TYPE_OCTET_STREAM = {
mime: 'application/octet-stream',
ext: null,
};
const TYPE_SVG = {
mime: 'image/svg+xml',
ext: 'svg',
};
@Injectable()
export class FileInfoService {
constructor(
) {
}
/**
* Get file information
*/
@bindThis
public async getFileInfo(path: string): Promise<FileInfo> {
const warnings = [] as string[];
const size = await this.getFileSize(path);
const md5 = await this.calcHash(path);
let type = await this.detectType(path);
// image dimensions
let width: number | undefined;
let height: number | undefined;
let orientation: number | undefined;
if ([
'image/png',
'image/gif',
'image/jpeg',
'image/webp',
'image/avif',
'image/apng',
'image/bmp',
'image/tiff',
'image/svg+xml',
'image/vnd.adobe.photoshop',
].includes(type.mime)) {
const imageSize = await this.detectImageSize(path).catch(e => {
warnings.push(`detectImageSize failed: ${e}`);
return undefined;
});
// うまく判定できない画像は octet-stream にする
if (!imageSize) {
warnings.push('cannot detect image dimensions');
type = TYPE_OCTET_STREAM;
} else if (imageSize.wUnits === 'px') {
width = imageSize.width;
height = imageSize.height;
orientation = imageSize.orientation;
// 制限を超えている画像は octet-stream にする
if (imageSize.width > 16383 || imageSize.height > 16383) {
warnings.push('image dimensions exceeds limits');
type = TYPE_OCTET_STREAM;
}
} else {
warnings.push(`unsupported unit type: ${imageSize.wUnits}`);
}
}
let blurhash: string | undefined;
if ([
'image/jpeg',
'image/gif',
'image/png',
'image/apng',
'image/webp',
'image/avif',
'image/svg+xml',
].includes(type.mime)) {
blurhash = await this.getBlurhash(path).catch(e => {
warnings.push(`getBlurhash failed: ${e}`);
return undefined;
});
}
const sensitive = false;
const porn = false;
return {
size,
md5,
type,
width,
height,
orientation,
blurhash,
sensitive,
porn,
warnings,
};
}
@bindThis
public fixMime(mime: string | fileType.MimeType): string {
// see https://github.com/misskey-dev/misskey/pull/10686
if (mime === 'audio/x-flac') {
return 'audio/flac';
}
if (mime === 'audio/vnd.wave') {
return 'audio/wav';
}
return mime;
}
/**
* Detect MIME Type and extension
*/
@bindThis
public async detectType(path: string): Promise<{
mime: string;
ext: string | null;
}> {
// Check 0 byte
const fileSize = await this.getFileSize(path);
if (fileSize === 0) {
return TYPE_OCTET_STREAM;
}
const type = await fileType.fileTypeFromFile(path);
if (type) {
// XMLはSVGかもしれない
if (type.mime === 'application/xml' && await this.checkSvg(path)) {
return TYPE_SVG;
}
return {
mime: this.fixMime(type.mime),
ext: type.ext,
};
}
// 種類が不明でもSVGかもしれない
if (await this.checkSvg(path)) {
return TYPE_SVG;
}
// それでも種類が不明なら application/octet-stream にする
return TYPE_OCTET_STREAM;
}
/**
* Check the file is SVG or not
*/
@bindThis
public async checkSvg(path: string): Promise<boolean> {
try {
const size = await this.getFileSize(path);
if (size > 1 * 1024 * 1024) return false;
const buffer = await fs.promises.readFile(path);
return isSvg(buffer.toString());
} catch {
return false;
}
}
/**
* Get file size
*/
@bindThis
public async getFileSize(path: string): Promise<number> {
return (await fs.promises.stat(path)).size;
}
/**
* Calculate MD5 hash
*/
@bindThis
private async calcHash(path: string): Promise<string> {
const hash = crypto.createHash('md5').setEncoding('hex');
await stream.pipeline(fs.createReadStream(path), hash);
return hash.read();
}
/**
* Detect dimensions of image
*/
@bindThis
private async detectImageSize(path: string): Promise<{
width: number;
height: number;
wUnits: string;
hUnits: string;
orientation?: number;
}> {
const readable = fs.createReadStream(path);
const imageSize = await probeImageSize(readable);
readable.destroy();
return imageSize;
}
/**
* Calculate average color of image
*/
@bindThis
private getBlurhash(path: string): Promise<string> {
return new Promise((resolve, reject) => {
sharp(path)
.raw()
.ensureAlpha()
.resize(64, 64, { fit: 'inside' })
.toBuffer((err, buffer, info) => {
if (err) return reject(err);
let hash;
try {
hash = encode(new Uint8ClampedArray(buffer), info.width, info.height, 5, 5);
} catch (e) {
return reject(e);
}
resolve(hash);
});
});
}
}
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