Cherry pick: Resolved #583: Added log listener (#584)

proj-android/PowerAuthLibrary/src/main/java/io/getlime/security/powerauth/system/PowerAuthLog.java

@@ -16,6 +16,8 @@
 
 package io.getlime.security.powerauth.system;
 
+import androidx.annotation.Nullable;
+
 /**
  * Class that provides logging facility for PowerAuth SDK library.
  *
@@ -37,6 +39,11 @@ public class PowerAuthLog {
      */
     private static final String LOG_TAG = "PowerAuthLibrary";
 
+    /**
+     * Listener that can tap into the log stream and process it on it's own.
+     */
+    public @Nullable static PowerAuthLogListener logListener;
+
     /**
      * Controls logging from PowerAuth classes
      * @param enabled enables or disables debug logs
@@ -74,6 +81,9 @@ public static void d(String format, Object... args) {
         if (logIsEnabled) {
             String message = String.format(format, args);
             android.util.Log.d(LOG_TAG, message);
+            if (logListener != null) {
+                logListener.powerAuthDebugLog(message);
+            }
         }
     }
 
@@ -87,5 +97,23 @@ public static void d(String format, Object... args) {
     public static void e(String format, Object... args) {
         String message = String.format(format, args);
         android.util.Log.e(LOG_TAG, message);
+        if (logListener != null) {
+            logListener.powerAuthErrorLog(message);
+        }
+    }
+
+    /**
+     * Adds a formatted WARNING log message. Unlike DEBUG message calling this method always
+     * produce error record.
+     * @param format format string, just like for {@link java.lang.String#format String.format}
+     * @param args Arguments referenced by the format specifiers in the format
+     *        string.
+     */
+    public static void w(String format, Object... args) {
+        String message = String.format(format, args);
+        android.util.Log.w(LOG_TAG, message);
+        if (logListener != null) {
+            logListener.powerAuthWarningLog(message);
+        }
     }
 }

proj-android/PowerAuthLibrary/src/main/java/io/getlime/security/powerauth/system/PowerAuthLogListener.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2024 Wultra s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.getlime.security.powerauth.system;
+
+import androidx.annotation.NonNull;
+
+/**
+ * Interface that represents a listener that can tap into the library logs and use them for example
+ * to report to a online system or to a logfile for user to send with some report. Note that by default
+ * all logs are logged into the Logcat.
+ *
+ * @author Jan Kobersky
+ */
+public interface PowerAuthLogListener {
+
+    /**
+     * Debug message reported by the library. Debug messages are only reported when
+     * {@link PowerAuthLog} setEnabled is set to true.
+     *
+     * @param message Debug message.
+     */
+    void powerAuthDebugLog(@NonNull String message);
+
+    /**
+     * Warning reported by the library.
+     *
+     * @param message Warning message.
+     */
+    void powerAuthWarningLog(@NonNull String message);
+
+    /**
+     * Error reported by the library.
+     *
+     * @param message Error message.
+     */
+    void powerAuthErrorLog(@NonNull String message);
+}