SMS Retriever API - 1

1. 이게 뭔가?

문자 받은내용 캐치하는거 원래는 permission으로 권한 얻어서 하면 됬었는데 이제는 SMS Retriever API 써서 해야한다.

2. Gradle

implementation 'com.google.android.gms:play-services:12.0.1'

Google Play Service필요

필요한 것만 등록해도 된다

https://developers.google.com/android/guides/setup

implementation 'com.google.android.gms:play-services-auth:12.0.1'

3. MainActivity.java

public class MainActivity extends AppCompatActivity implements Button.OnClickListener, SmsReceiver.OTPReceiveListener {

    Button phone_selector_btn;
    TextView otp_tv;

    SmsReceiver smsReceiver;
    Context mContext;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mContext = this;
        smsReceiver = new SmsReceiver();
        initLayout();

        //11자리 해쉬코드값 구하기
        Util.getAppSignatures(this);
    }


    /** mRetrieverClient 선언/실행
     */
    @Override
    protected void onResume() {
        super.onResume();

        SmsRetrieverClient client = SmsRetriever.getClient(this /* context */);
        Task<Void> task = client.startSmsRetriever();

        task.addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void aVoid) {
                IntentFilter intentFilter = new IntentFilter(SmsRetriever.SMS_RETRIEVED_ACTION);
                registerReceiver(smsReceiver, intentFilter);
                Log.d("SSS", "onSuccess");
            }
        });

        task.addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.e("SSS", "onFailure" + e.toString());
            }
        });
    }


    /** mRetrieverClient 종료
     */
    @Override
    protected void onStop() {
        super.onStop();

        try {
            this.unregisterReceiver(smsReceiver);
        }catch (Exception e){
        }

    }




    @Override
    public void onOTPReceived(String msg) {
        otp_tv.setText("OTP Number : " +  msg);
    }

    @Override
    public void onOTPTimeOut() {
        otp_tv.setText("Timeout");
    }


    private void initLayout(){

        //Button
        phone_selector_btn = findViewById(R.id.btn_phone_selector);
        phone_selector_btn.setOnClickListener(this);

        //TextView
        otp_tv = findViewById(R.id.otp_tv);
    }
}

4. SmsReceiver.java

<receiver
    android:name=".SmsReceiver"
    android:exported="true">

    <intent-filter>
        <action android:name="com.google.android.gms.auth.api.phone.SMS_RETRIEVED"/>
    </intent-filter>
</receiver>

public class SmsReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {

        if (SmsRetriever.SMS_RETRIEVED_ACTION.equals(intent.getAction())) {
            Bundle extras = intent.getExtras();
            Status status = (Status) extras.get(SmsRetriever.EXTRA_STATUS);;

            switch(status.getStatusCode()) {
                case CommonStatusCodes.SUCCESS:
                    String message = (String) extras.get(SmsRetriever.EXTRA_SMS_MESSAGE);
                    //여기서 받음
                    Log.d("SSS", "서버로부터 받은 Message: " + message);

                    break;
                case CommonStatusCodes.TIMEOUT:
                    //시간초과
                    Log.d("SSS", "onReceive - CommonStatusCodes.SUCCESS");
                    break;
            }
        }
    }


    //인터페이스
    public interface OTPReceiveListener {

        void onOTPReceived(String msg);

        void onOTPTimeOut();
    }
}

5. Hash코드 구하는 코드(Util.java)

public class Util {
    public static final String TAG = Util.class.getSimpleName();

    private static final String HASH_TYPE = "SHA-256";
    public static final int NUM_HASHED_BYTES = 9;
    public static final int NUM_BASE64_CHAR = 11;

    /**
     * get App Signatures
     */
    public static ArrayList<String> getAppSignatures(Context context) {
        ArrayList<String> appCodes = new ArrayList<>();


        try {
            // Get all package signatures for the current package
            String packageName = context.getPackageName();
            PackageManager packageManager = context.getPackageManager();
            Signature[] signatures = packageManager.getPackageInfo(packageName,
                    PackageManager.GET_SIGNATURES).signatures;

            // For each signature create a compatible hash
            for (Signature signature : signatures) {
                String hash = getHash(packageName, signature.toCharsString());
                if (hash != null) {
                    appCodes.add(String.format("%s", hash));
                }
                Log.d(TAG, String.format("이 값을 SMS 뒤에 써서 보내주면 됩니다 : %s", hash));
            }
        } catch (PackageManager.NameNotFoundException e) {
            Log.d(TAG, "Unable to find package to obtain hash. : " + e.toString());
        }
        return appCodes;
    }

    private static String getHash(String packageName, String signature) {
        String appInfo = packageName + " " + signature;
        try {
            MessageDigest messageDigest = MessageDigest.getInstance(HASH_TYPE);
            // minSdkVersion이 19이상이면 체크 안해도 됨
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                messageDigest.update(appInfo.getBytes(StandardCharsets.UTF_8));
            }
            byte[] hashSignature = messageDigest.digest();

            // truncated into NUM_HASHED_BYTES
            hashSignature = Arrays.copyOfRange(hashSignature, 0, NUM_HASHED_BYTES);
            // encode into Base64
            String base64Hash = Base64.encodeToString(hashSignature, Base64.NO_PADDING | Base64.NO_WRAP);
            base64Hash = base64Hash.substring(0, NUM_BASE64_CHAR);

            Log.d(TAG, String.format("\nPackage : %s\nHash : %s", packageName, base64Hash));
            return base64Hash;
        } catch (NoSuchAlgorithmException e) {
            Log.d(TAG, "hash:NoSuchAlgorithm : " + e.toString());
        }
        return null;
    }
}

6. 문자양식

<#> XXX 앱의 인증번호는 [123456] 입니다.
FA+9qCX9VSu

<#>으로 시작해야 하고, 마지막에 해쉬코드 11자리가 들어가야한다.

예제코드: https://github.com/lipnus/SMS_Retriever_API_example

참고: https://captainwonjong.github.io/2018-09-10/SMS-Retriever-API/