config: show more informative error message on wrong key

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/java/com/wireguard/android/fragment/TunnelListFragment.java

@@ -85,7 +85,7 @@ public class TunnelListFragment extends BaseFragment {
             final FragmentManager fragmentManager = getFragmentManager();
             if (fragmentManager != null)
                 ConfigNamingDialogFragment.newInstance(configText).show(fragmentManager, null);
-        } catch (final IllegalArgumentException|IOException exception) {
+        } catch (final Exception exception) {
             onTunnelImportFinished(Collections.emptyList(), Collections.singletonList(exception));
         }
     }

app/src/main/java/com/wireguard/config/Attribute.java

@@ -55,6 +55,7 @@ public enum Attribute {
         return TextUtils.join(", ", iterable);
     }
 
+    @Nullable
     public static Attribute match(final CharSequence line) {
         return KEY_MAP.get(SEPARATOR_PATTERN.split(line)[0].toLowerCase());
     }

app/src/main/java/com/wireguard/config/Interface.java

@@ -140,6 +140,8 @@ public class Interface {
 
     public void parse(final String line) {
         final Attribute key = Attribute.match(line);
+        if (key == null)
+            throw new IllegalArgumentException(String.format("Unable to parse line: \"%s\"", line));
         switch (key) {
             case ADDRESS:
                 addAddresses(key.parseList(line));

app/src/main/java/com/wireguard/config/Peer.java

@@ -113,6 +113,8 @@ public class Peer {
 
     public void parse(final String line) {
         final Attribute key = Attribute.match(line);
+        if (key == null)
+            throw new IllegalArgumentException(String.format("Unable to parse line: \"%s\"", line));
         switch (key) {
             case ALLOWED_IPS:
                 addAllowedIPs(key.parseList(line));