Twilio firebase functions

​https://angularfirebase.com/lessons/sms-texting-with-twilio/​
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// firebase functions:config:set twilio.sid="YOUR_ACCOUNT_SID" twilio.token="YOUR_AUTH_TOKEN"
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// https://angularfirebase.com/lessons/sms-texting-with-twilio/
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exports.makePhoneCall = functions.https.onCall((data, context) => {
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  if (!context.auth) {
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    throw new functions.https.HttpsError(
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      "failed-precondition",
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      "The function must be called " + "while authenticated."
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    );
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  }
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  const twillioPhoneNumber = "+12089532138";
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  const toPhoneNumber = data.phoneNumber;
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​
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  const accountSid = functions.config().twilio.sid;
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  const authToken = functions.config().twilio.token;
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  const client = new twilio(accountSid, authToken);
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​
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  const main = async () => {
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    try {
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      const call = await client.calls.create({
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        //  method: 'GET',
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        //  statusCallback: 'https://www.myapp.com/events',
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        //  statusCallbackEvent: ['initiated', 'answered', 'completed'],
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        //  statusCallbackMethod: 'POST',
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        // replace with https://www.twilio.com/console/twiml-bins/create,
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        // https://www.twilio.com/docs/voice/make-calls#manage-your-outbound-call
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        // record: true,
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        url: "http://demo.twilio.com/docs/voice.xml",
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        to: toPhoneNumber,
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        from: twillioPhoneNumber
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      });
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​
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      console.log(call);
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      // should save callSid `call.sid` to firestore
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      return {
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        status: "OK",
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        text: `calling ${toPhoneNumber} from ${twillioPhoneNumber}`,
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        callSid: call.sid
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      };
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    } catch (e) {
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      console.error(e);
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      return { status: "error", error: e };
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    }
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  };
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​
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  return main();
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});
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