Remove workaround for JGit crashing on 'utf-9' etc

Updating JGit fixed the issue that a commit in a repo with an unknown
character set throws an exception. This would crash the RepositoryManager.
The extra handling, which patches JGit classes during runtime is completely
removed.

src/main/java/com/gitblit/manager/RepositoryManager.java

@@ -19,11 +19,8 @@ import java.io.File;
 import java.io.FileFilter;
 import java.io.IOException;
 import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
 import java.net.URI;
 import java.net.URISyntaxException;
-import java.nio.charset.Charset;
-import java.nio.charset.StandardCharsets;
 import java.text.MessageFormat;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
@@ -55,7 +52,6 @@ import org.eclipse.jgit.storage.file.FileBasedConfig;
 import org.eclipse.jgit.storage.file.WindowCacheConfig;
 import org.eclipse.jgit.util.FS;
 import org.eclipse.jgit.util.FileUtils;
-import org.eclipse.jgit.util.RawParseUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -89,7 +85,6 @@ import com.gitblit.utils.CommitCache;
 import com.gitblit.utils.DeepCopier;
 import com.gitblit.utils.JGitUtils;
 import com.gitblit.utils.JGitUtils.LastChange;
-import com.gitblit.utils.MapUtils;
 import com.gitblit.utils.MetricUtils;
 import com.gitblit.utils.ModelUtils;
 import com.gitblit.utils.ObjectCache;
@@ -1927,7 +1922,6 @@ public class RepositoryManager implements IRepositoryManager {
 		}
 	}
 
-	@SuppressWarnings("unchecked")
 	protected void configureJGit() {
 		// Configure JGit
 		WindowCacheConfig cfg = new WindowCacheConfig();
@@ -1948,43 +1942,6 @@ public class RepositoryManager implements IRepositoryManager {
 		} catch (IllegalArgumentException e) {
 			logger.error("Failed to configure JGit parameters!", e);
 		}
-		
-		try {
-			// issue-486/ticket-151: UTF-9 & UTF-18
-			// issue-560/ticket-237: 'UTF8'
-			Field field = RawParseUtils.class.getDeclaredField("encodingAliases");
-			field.setAccessible(true);
-
-			Map<String, Charset> encodingAliases;
-			
-			try {
-				Field modifiersField = Field.class.getDeclaredField("modifiers");
-				modifiersField.setAccessible(true);
-				modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
-			      
-				// Since unknown encodingAliases cause GitBlit to crash we replace the 
-				// map by a wrapper class that always returns a value. ISO-8859-1 seems
-				// appropriate since it is a fixed 8-bit encoding.
-				encodingAliases = (Map<String, Charset>) field.get(null);
-				encodingAliases = MapUtils.defaultMap(encodingAliases, StandardCharsets.ISO_8859_1);
-				field.set(null, encodingAliases);
-				
-				modifiersField.setInt(field, field.getModifiers() | Modifier.FINAL);
-				modifiersField.setAccessible(false);
-			} catch(Throwable t) {
-				logger.error("Failed to inject wrapper class for encoding Aliases", t);
-				encodingAliases = (Map<String, Charset>) field.get(null);
-			}
-			
-			// Provided sensible default mappings
-			encodingAliases.put("'utf8'", RawParseUtils.UTF8_CHARSET);
-			encodingAliases.put("utf-9", RawParseUtils.UTF8_CHARSET);
-			encodingAliases.put("utf-18", RawParseUtils.UTF8_CHARSET);
-			
-			logger.info("Alias 'UTF8', UTF-9 & UTF-18 encodings as UTF-8 in JGit");
-		} catch (Throwable t) {
-			logger.error("Failed to inject UTF-9 & UTF-18 encoding aliases into JGit", t);
-		}
 	}
 
 	protected void configureCommitCache() {

src/main/java/com/gitblit/utils/MapUtils.java

@@ -1,116 +0,0 @@
-package com.gitblit.utils;
-
-import java.text.MessageFormat;
-import java.util.Collection;
-import java.util.Map;
-import java.util.Set;
-
-import org.apache.mina.util.ConcurrentHashSet;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * A utility wrapper class to generate a default value over an existing map
- * 
- * @author Jan Vanhercke
- *
- */
-public class MapUtils {
-
-	private static final Logger logger = LoggerFactory.getLogger(MapUtils.class);
-
-	public static <K, V> Map<K, V> defaultMap(Map<K, V> delegate, V value) {
-		return new Wrap<>(delegate, value);
-	}
-
-	private static class Wrap<K, V> implements Map<K, V> {
-
-		private Map<K, V> delegate;
-
-		// HashSet is only used to reduce logging
-
-		private Set<K> unknownKeys = new ConcurrentHashSet<>();
-
-		private V value;
-
-		private Wrap(Map<K, V> delegate, V value) {
-			this.delegate = delegate;
-			this.value = value;
-		}
-
-		@Override
-		public int size() {
-			return delegate.size();
-		}
-
-		@Override
-		public boolean isEmpty() {
-			return delegate.isEmpty();
-		}
-
-		@Override
-		public boolean containsKey(Object key) {
-			return true;
-		}
-
-		@Override
-		public boolean containsValue(Object value) {
-			return true;
-		}
-
-		@SuppressWarnings("unchecked")
-		@Override
-		public V get(Object key) {
-			V retv = delegate.get(key);
-
-			if (retv == null) {
-				if (unknownKeys.add((K) key))
-					logger.error(MessageFormat.format("Default value {0} generated for key {1}", value, key));
-
-				return value;
-			}
-
-			return retv;
-		}
-
-		@Override
-		public V put(K key, V value) {
-			return delegate.put(key, value);
-		}
-
-		@Override
-		public V remove(Object key) {
-			V retv = delegate.remove(key);
-
-			if (retv == null)
-				return value;
-
-			return value;
-		}
-
-		@Override
-		public void putAll(Map<? extends K, ? extends V> m) {
-			delegate.putAll(m);
-		}
-
-		@Override
-		public void clear() {
-			delegate.clear();
-		}
-
-		@Override
-		public Set<K> keySet() {
-			return delegate.keySet();
-		}
-
-		@Override
-		public Collection<V> values() {
-			return delegate.values();
-		}
-
-		@Override
-		public Set<java.util.Map.Entry<K, V>> entrySet() {
-			return delegate.entrySet();
-		}
-	}
-}