#1169 try to better handle networking errors

3 files changed, 79 insertions, 2 deletions

diff --git a/app/src/main/java/it/niedermann/nextcloud/deck/api/RequestHelper.java b/app/src/main/java/it/niedermann/nextcloud/deck/api/RequestHelper.java
index 26091e8bc..79790484a 100644
--- a/app/src/main/java/it/niedermann/nextcloud/deck/api/RequestHelper.java
+++ b/app/src/main/java/it/niedermann/nextcloud/deck/api/RequestHelper.java
@@ -42,7 +42,7 @@ public class RequestHelper {
         private final Consumer<Throwable> exceptionConsumer = new Consumer<>() {
             @Override
             public void accept(final Throwable throwable) {
-                callback.onError(throwable);
+                callback.onError(ServerCommunicationErrorHandler.translateError(throwable));
             }
         };
 
diff --git a/app/src/main/java/it/niedermann/nextcloud/deck/api/ServerCommunicationErrorHandler.java b/app/src/main/java/it/niedermann/nextcloud/deck/api/ServerCommunicationErrorHandler.java
new file mode 100644
index 000000000..a76bca956
--- /dev/null
+++ b/app/src/main/java/it/niedermann/nextcloud/deck/api/ServerCommunicationErrorHandler.java
@@ -0,0 +1,39 @@
+package it.niedermann.nextcloud.deck.api;
+
+import com.nextcloud.android.sso.exceptions.UnknownErrorException;
+
+import java.util.Objects;
+
+import it.niedermann.nextcloud.deck.exceptions.OfflineException;
+
+public class ServerCommunicationErrorHandler {
+    public static Throwable translateError (Throwable error){
+        try {
+            if (error.getClass() == UnknownErrorException.class) {
+                return handleSsoExceptions(error);
+            } else if(error.getClass() == ClassNotFoundException.class) {
+                return handleClassNotFoundError(error);
+            }
+        } catch (NullPointerException e) {
+            return error;
+        }
+
+        return error;
+    }
+
+    private static Throwable handleClassNotFoundError(Throwable error) {
+        String message = Objects.requireNonNull(error.getMessage(), "ClassNotFound handler got no ExceptionMessage").toLowerCase();
+        if (message.contains("connecttimeoutexception")) {
+            return new OfflineException(OfflineException.Reason.CONNECTION_TIMEOUT);
+        }
+        return error;
+    }
+
+    private static Throwable handleSsoExceptions(Throwable error) {
+        String message = Objects.requireNonNull(error.getMessage(), "SSO handler got no ExceptionMessage").toLowerCase();
+        if (message.contains("econnrefused") || message.contains("connection refused")) {
+            return new OfflineException(OfflineException.Reason.CONNECTION_REFUSED);
+        }
+        return error;
+    }
+}
diff --git a/app/src/main/java/it/niedermann/nextcloud/deck/exceptions/OfflineException.java b/app/src/main/java/it/niedermann/nextcloud/deck/exceptions/OfflineException.java
index c63b801a0..bcd41cb16 100644
--- a/app/src/main/java/it/niedermann/nextcloud/deck/exceptions/OfflineException.java
+++ b/app/src/main/java/it/niedermann/nextcloud/deck/exceptions/OfflineException.java
@@ -1,7 +1,45 @@
 package it.niedermann.nextcloud.deck.exceptions;
 
+import androidx.annotation.Nullable;
+
 public class OfflineException extends IllegalStateException {
+
+    private final Reason reason;
+
+    public enum Reason {
+        OFFLINE("offline",  "The device is currently offline"),
+        CONNECTION_REFUSED("connection_refused", "Connection was refused, please check if your server is reachable"),
+        CONNECTION_TIMEOUT("connection_timeout", "Connection timed out, please check if you're connected to the internet"),
+        ;
+
+        private String key;
+        private String whatHappened;
+
+        Reason(String key, String whatHappened) {
+            this.key = key;
+            this.whatHappened = whatHappened;
+        }
+
+        public String getKey() {
+            return key;
+        }
+
+        public String getWhatHappened() {
+            return whatHappened;
+        }
+    }
+
+
     public OfflineException() {
-        super("Device is currently offline.");
+        this(Reason.OFFLINE);
+    }
+    public OfflineException(Reason reason) {
+        super(reason.getWhatHappened());
+        this.reason = reason;
+    }
+
+    @Nullable
+    public Reason getReason() {
+        return reason;
     }
 }