| 1 | import { createHash } from 'node:crypto' |
| 2 | import { Logger } from '@nestjs/common' |
| 3 | import { AssetsService } from '@yikart/assets' |
| 4 | import { getErrorMessage } from '@yikart/common' |
| 5 | import { AssetType } from '@yikart/mongodb' |
| 6 | import sizeOf from 'image-size' |
| 7 | import { config } from '../../../../config' |
| 8 | import { VolcengineService } from '../../../ai/libs/volcengine' |
| 9 | |
| 10 | /** |
| 11 | * 火山引擎视频处理工具类 |
| 12 | * 提供视频下载、上传、鉴权等通用功能 |
| 13 | */ |
| 14 | export class VolcengineVideoUtils { |
| 15 | /** |
| 16 | * 解析 URL 的各个部分 |
| 17 | */ |
| 18 | static splitUrl(url: string): { scheme: string, host: string, path: string, args: string } { |
| 19 | const urlObj = new URL(url) |
| 20 | return { |
| 21 | scheme: `${urlObj.protocol}//`, |
| 22 | host: urlObj.host, |
| 23 | path: urlObj.pathname, |
| 24 | args: urlObj.search || '', |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | /** |
| 29 | * 计算字符串的 MD5 哈希值 |
| 30 | */ |
| 31 | static getMd5(text: string): string { |
| 32 | return createHash('md5').update(text).digest('hex') |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * 生成指定长度的随机字符串 |
| 37 | */ |
| 38 | static getRandomString(length: number): string { |
| 39 | const chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' |
| 40 | let result = '' |
| 41 | for (let i = 0; i < length; i++) { |
| 42 | result += chars[Math.floor(Math.random() * chars.length)] |
| 43 | } |
| 44 | return result |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * 生成 A 类型鉴权 URL |
| 49 | * @param url 基础 URL（完整 URL，如 http://play.vod.com/FileName） |
| 50 | * @param key 鉴权密钥 |
| 51 | * @param ts 时间戳（Unix 时间戳，秒） |
| 52 | * @returns 带鉴权参数的完整 URL |
| 53 | */ |
| 54 | static genTypeAUrl(url: string, key: string, ts: number): string { |
| 55 | const { scheme, host, path, args } = this.splitUrl(url) |
| 56 | const signName = 'auth_key' // 固定为 auth_key |
| 57 | const uid = '0' // 固定为 0 |
| 58 | const randStr = this.getRandomString(10) |
| 59 | |
| 60 | // 计算签名：text = {path}-{ts}-{rand}-{uid}-{key} |
| 61 | const text = `${path}-${ts}-${randStr}-${uid}-${key}` |
| 62 | const hash = this.getMd5(text) |
| 63 | |
| 64 | // 生成鉴权参数：auth_key={ts}-{rand}-{uid}-{hash} |
| 65 | const authArg = `${signName}=${ts}-${randStr}-${uid}-${hash}` |
| 66 | |
| 67 | if (!args) { |
| 68 | return `${scheme}${host}${path}?${authArg}` |
| 69 | } |
| 70 | else { |
| 71 | return `${scheme}${host}${path}${args}&${authArg}` |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * 获取图片尺寸 |
| 77 | * @param imageUrl 图片 URL |
| 78 | * @param logger 日志记录器 |
| 79 | * @returns 图片的宽度和高度 |
| 80 | */ |
| 81 | static async getImageDimensions( |
| 82 | imageUrl: string, |
| 83 | logger: Logger, |
| 84 | ): Promise<{ width: number, height: number }> { |
| 85 | try { |
| 86 | logger.debug('[getImageDimensions] Fetching image dimensions', { url: imageUrl }) |
| 87 | |
| 88 | const response = await fetch(imageUrl) |
| 89 | if (!response.ok) { |
| 90 | throw new Error(`HTTP ${response.status}`) |
| 91 | } |
| 92 | |
| 93 | const arrayBuffer = await response.arrayBuffer() |
| 94 | const buffer = Buffer.from(arrayBuffer) |
| 95 | const dimensions = sizeOf(buffer) |
| 96 | |
| 97 | if (!dimensions.width || !dimensions.height) { |
| 98 | throw new Error('Failed to get image dimensions') |
| 99 | } |
| 100 | |
| 101 | logger.debug('[getImageDimensions] Image dimensions retrieved', { |
| 102 | width: dimensions.width, |
| 103 | height: dimensions.height, |
| 104 | }) |
| 105 | |
| 106 | return { |
| 107 | width: dimensions.width, |
| 108 | height: dimensions.height, |
| 109 | } |
| 110 | } |
| 111 | catch (error) { |
| 112 | const errorMessage = getErrorMessage(error) |
| 113 | logger.error('[getImageDimensions] Failed to get image dimensions', { |
| 114 | error: errorMessage, |
| 115 | url: imageUrl, |
| 116 | }) |
| 117 | logger.warn('[getImageDimensions] Using default dimensions 1920x1080') |
| 118 | return { width: 1920, height: 1080 } |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * 根据 FileName 拼接播放 URL 并下载上传 |
| 124 | * @param fileName 文件路径 |
| 125 | * @param userId 用户 ID |
| 126 | * @param filenamePrefix 文件名前缀 |
| 127 | * @param subPath 子路径（如模型名称） |
| 128 | * @param assetsService Assets 服务 |
| 129 | * @param logger 日志记录器 |
| 130 | * @param assetType 资源类型 |
| 131 | * @returns URL 或 undefined |
| 132 | */ |
| 133 | static async saveVideoFromFileName( |
| 134 | fileName: string, |
| 135 | userId: string, |
| 136 | filenamePrefix: string, |
| 137 | subPath: string, |
| 138 | assetsService: AssetsService, |
| 139 | logger: Logger, |
| 140 | assetType: AssetType = AssetType.AideoOutput, |
| 141 | ): Promise<string | undefined> { |
| 142 | const playbackBaseUrl = config.ai.volcengine?.playbackBaseUrl |
| 143 | const urlAuthPrimaryKey = config.ai.volcengine?.urlAuthPrimaryKey |
| 144 | |
| 145 | if (!playbackBaseUrl || !urlAuthPrimaryKey) { |
| 146 | logger.warn({ fileName }, 'volcengine 未配置，跳过播放 URL 拼接') |
| 147 | return undefined |
| 148 | } |
| 149 | |
| 150 | const normalizedFileName = fileName.startsWith('/') ? fileName : `/${fileName}` |
| 151 | const baseUrl = `${playbackBaseUrl}${normalizedFileName}` |
| 152 | |
| 153 | const ts = Math.floor(Date.now() / 1000) + 3600 |
| 154 | const playbackUrl = this.genTypeAUrl(baseUrl, urlAuthPrimaryKey, ts) |
| 155 | |
| 156 | logger.debug({ playbackUrl, fileName }, '拼接播放 URL') |
| 157 | |
| 158 | // 使用 fetch 流式下载并上传 |
| 159 | const response = await fetch(playbackUrl) |
| 160 | if (!response.ok || !response.body) { |
| 161 | throw new Error(`下载失败: ${response.status}`) |
| 162 | } |
| 163 | |
| 164 | const contentLength = response.headers.get('content-length') |
| 165 | const size = contentLength ? Number.parseInt(contentLength, 10) : 0 |
| 166 | |
| 167 | logger.debug({ size: `${(size / 1024 / 1024).toFixed(2)} MB` }, '开始流式上传') |
| 168 | |
| 169 | const arrayBuffer = await response.arrayBuffer() |
| 170 | const buffer = Buffer.from(arrayBuffer) |
| 171 | |
| 172 | const result = await assetsService.uploadFromStream(userId, buffer, { |
| 173 | type: assetType, |
| 174 | mimeType: 'video/mp4', |
| 175 | size, |
| 176 | }, subPath) |
| 177 | |
| 178 | return assetsService.buildUrl(result.asset.path) |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * 从 VID 获取视频并上传 |
| 183 | * @param vid 视频 ID |
| 184 | * @param userId 用户 ID |
| 185 | * @param filenamePrefix 文件名前缀 |
| 186 | * @param subPath 子路径（如模型名称） |
| 187 | * @param volcengineService 火山引擎服务 |
| 188 | * @param assetsService Assets 服务 |
| 189 | * @param logger 日志记录器 |
| 190 | * @param assetType 资源类型 |
| 191 | * @returns URL，如果失败则返回 undefined |
| 192 | */ |
| 193 | static async saveVideoFromVid( |
| 194 | vid: string, |
| 195 | userId: string, |
| 196 | filenamePrefix: string, |
| 197 | subPath: string, |
| 198 | volcengineService: VolcengineService, |
| 199 | assetsService: AssetsService, |
| 200 | logger: Logger, |
| 201 | assetType: AssetType = AssetType.AideoOutput, |
| 202 | ): Promise<string | undefined> { |
| 203 | const mediaInfo = await volcengineService.getMediaInfos({ |
| 204 | Vids: vid, |
| 205 | }) |
| 206 | |
| 207 | const sourceInfo = mediaInfo.MediaInfoList?.[0]?.SourceInfo as Record<string, unknown> | undefined |
| 208 | |
| 209 | const fileName = sourceInfo?.['FileName'] as string |
| 210 | |
| 211 | return this.saveVideoFromFileName( |
| 212 | fileName, |
| 213 | userId, |
| 214 | filenamePrefix, |
| 215 | subPath, |
| 216 | assetsService, |
| 217 | logger, |
| 218 | assetType, |
| 219 | ) |
| 220 | } |
| 221 | } |
| 222 |