需要安装 crypto-js axios
iflytek.service.ts

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import { Injectable } from '@nestjs/common';
import axios from 'axios';
import { HmacSHA256, enc } from 'crypto-js';

@Injectable()
export class IflytekService {
    private OCR_SECRET = '自己的Secret'
    private OCR_KEY = '自己的key'
    private OCR_APPID = '自己的appid'

    async ocr(file: Express.Multer.File) {
        const date = new Date().toUTCString()
        const host = 'api.xf-yun.com'
        // 签名原始字符
        const signature_origin = "host: api.xf-yun.com\n" + "date: " + date + "\nPOST /v1/private/sf8e6aca1 HTTP/1.1"
        // 签名
        const signature = enc.Base64.stringify(HmacSHA256(signature_origin, this.OCR_SECRET))
        // authorization原始字符
        const authorization_origin = `api_key="${this.OCR_KEY}",algorithm="hmac-sha256",headers="host date request-line",signature="${signature}"`
        const authorization = enc.Base64.stringify(enc.Utf8.parse(authorization_origin));

        const fileStr = file.originalname.split('.')
        const filetype = fileStr[fileStr.length - 1]

        const imageData = file.buffer.toString("base64")

        const { data,statusText } = await axios({
            method: 'post',
            url: `https://api.xf-yun.com/v1/private/sf8e6aca1?authorization=${authorization}&host=${host}&date=${date}`,
            data: {
                header: {
                    app_id: this.OCR_APPID,
                    status: 3
                },
                parameter: {
                    sf8e6aca1: {
                        category: "ch_en_public_cloud",
                        result: {
                            encoding: "utf8",
                            compress: "raw",
                            format: "json"
                        }
                    }
                },
                payload: {
                    sf8e6aca1_data_1: {
                        encoding: filetype,
                        status: 3,
                        image: imageData
                    }
                }
            }
        })
        if(data?.payload?.result?.text) {
            const words = enc.Base64.parse(data?.payload?.result?.text)
            const str = enc.Utf8.stringify(words)
            return {
                success: true,
                data: JSON.parse(str)
            }
        } else {
            return {
                success: false
            }
        }
    }
}