如何从angular App向手机下发短信

import { HttpClient } from '@angular/common/http';

@Injectable()
export class SmsService {
  private apiUrl = 'https://sms.tencentcloudapi.com/';

  constructor(private http: HttpClient) {}

  sendSms(phoneNumber: string, message: string): Observable<any> {
    const apiKey = 'YOUR_API_KEY';
    const secretKey = 'YOUR_SECRET_KEY';

    const body = {
      PhoneNumberSet: [phoneNumber],
      TemplateID: 'YOUR_TEMPLATE_ID',
      SmsSdkAppid: 'YOUR_SDK_APPID',
      Sign: 'YOUR_SIGN',
      TemplateParamSet: [message],
    };

    const headers = {
      'Content-Type': 'application/json',
      'X-TC-Action': 'SendSms',
      'X-TC-Version': '2019-07-11',
      'X-TC-Region': 'ap-guangzhou',
      'Authorization': this.generateAuthorization(apiKey, secretKey),
    };

    return this.http.post(this.apiUrl, body, { headers });
  }

  private generateAuthorization(apiKey: string, secretKey: string): string {
    const timestamp = Math.floor(Date.now() / 1000);
    const signStr = `x-tc-key=${apiKey}&x-tc-timestamp=${timestamp}`;
    const signature = CryptoJS.HmacSHA1(signStr, secretKey).toString(CryptoJS.enc.Base64);
    return `TC3-HMAC-SHA256 Credential=${apiKey}/${this.getDateString(timestamp)}/sms/tc3_request, SignedHeaders=content-type;host, Signature=${signature}`;
  }

  private getDateString(timestamp: number): string {
    const date = new Date(timestamp * 1000);
    return date.toISOString().substr(0, 10);
  }
}