310 lines
7 KiB
TypeScript
310 lines
7 KiB
TypeScript
/*
|
||
* SPDX-FileCopyrightText: syuilo and misskey-project
|
||
* 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 FFmpeg from 'fluent-ffmpeg';
|
||
import isSvg from 'is-svg';
|
||
import probeImageSize from 'probe-image-size';
|
||
import { sharpBmp } from '@misskey-dev/sharp-read-bmp';
|
||
import * as blurhash from 'blurhash';
|
||
import { LoggerService } from '@/core/LoggerService.js';
|
||
import type Logger from '@/logger.js';
|
||
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 {
|
||
private logger: Logger;
|
||
|
||
constructor(
|
||
private loggerService: LoggerService,
|
||
) {
|
||
this.logger = this.loggerService.getLogger('file-info');
|
||
}
|
||
|
||
/**
|
||
* 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, type.mime).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;
|
||
}
|
||
|
||
/**
|
||
* ビデオファイルにビデオトラックがあるかどうかチェック
|
||
* （ない場合：m4a, webmなど）
|
||
*
|
||
* @param path ファイルパス
|
||
* @returns ビデオトラックがあるかどうか（エラー発生時は常に`true`を返す）
|
||
*/
|
||
@bindThis
|
||
private hasVideoTrackOnVideoFile(path: string): Promise<boolean> {
|
||
const sublogger = this.logger.createSubLogger('ffprobe');
|
||
sublogger.info(`Checking the video file. File path: ${path}`);
|
||
return new Promise((resolve) => {
|
||
try {
|
||
FFmpeg.ffprobe(path, (err, metadata) => {
|
||
if (err) {
|
||
sublogger.warn(`Could not check the video file. Returns true. File path: ${path}`, err);
|
||
resolve(true);
|
||
return;
|
||
}
|
||
resolve(metadata.streams.some((stream) => stream.codec_type === 'video'));
|
||
});
|
||
} catch (err) {
|
||
sublogger.warn(`Could not check the video file. Returns true. File path: ${path}`, err as Error);
|
||
resolve(true);
|
||
}
|
||
});
|
||
}
|
||
|
||
/**
|
||
* Detect MIME Type and extension
|
||
*/
|
||
@bindThis
|
||
public async detectType(path: string): Promise<{
|
||
mime: string;
|
||
ext: string | null;
|
||
}> {
|
||
// Check 0 byte
|
||
const fileSize = await this.getFileSize(path);
|
||
if (fileSize === 0) {
|
||
return TYPE_OCTET_STREAM;
|
||
}
|
||
|
||
const type = await fileType.fileTypeFromFile(path);
|
||
|
||
if (type) {
|
||
// XMLはSVGかもしれない
|
||
if (type.mime === 'application/xml' && await this.checkSvg(path)) {
|
||
return TYPE_SVG;
|
||
}
|
||
|
||
if ((type.mime.startsWith('video') || type.mime === 'application/ogg') && !(await this.hasVideoTrackOnVideoFile(path))) {
|
||
const newMime = `audio/${type.mime.split('/')[1]}`;
|
||
if (newMime === 'audio/mp4') {
|
||
return {
|
||
mime: 'audio/mp4',
|
||
ext: 'm4a',
|
||
};
|
||
}
|
||
return {
|
||
mime: newMime,
|
||
ext: type.ext,
|
||
};
|
||
}
|
||
|
||
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 blurhash string of image
|
||
*/
|
||
@bindThis
|
||
private getBlurhash(path: string, type: string): Promise<string> {
|
||
return new Promise(async (resolve, reject) => {
|
||
(await sharpBmp(path, type))
|
||
.raw()
|
||
.ensureAlpha()
|
||
.resize(64, 64, { fit: 'inside' })
|
||
.toBuffer((err, buffer, info) => {
|
||
if (err) return reject(err);
|
||
|
||
let hash;
|
||
|
||
try {
|
||
hash = blurhash.encode(new Uint8ClampedArray(buffer), info.width, info.height, 5, 5);
|
||
} catch (e) {
|
||
return reject(e);
|
||
}
|
||
|
||
resolve(hash);
|
||
});
|
||
});
|
||
}
|
||
}
|