Add IOException handling for TOTP secret retrieval

Author: LabyStudio

build.gradle

@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'de.labystudio'
-version '1.3.0'
+version '1.3.1'
 
 compileJava {
     sourceCompatibility = '1.8'

src/main/java/de/labystudio/spotifyapi/open/OpenSpotifyAPI.java

@@ -98,6 +98,9 @@ public long requestServerTime() throws IOException {
      */
     private AccessTokenResponse generateAccessToken() throws IOException {
         Secret secret = this.secretProvider.getSecret();
+        if (secret == null) {
+            throw new IOException("No TOTP secret provided");
+        }
 
         long serverTime = this.requestServerTime();
         String totp = TOTP.generateOtp(secret.toBytes(), serverTime, 30, 6);

src/main/java/de/labystudio/spotifyapi/open/totp/provider/SecretProvider.java

@@ -2,6 +2,8 @@
 
 import de.labystudio.spotifyapi.open.totp.model.Secret;
 
+import java.io.IOException;
+
 /**
  * This interface is used to provide a secret for TOTP generation.
  * It must be implemented to retrieve the latest secret from open.spotify.com
@@ -15,5 +17,5 @@ public interface SecretProvider {
      *
      * @return The latest TOTP secret used for generating time-based one-time passwords.
      */
-    Secret getSecret();
+    Secret getSecret() throws IOException;
 }