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Console: Safer processing of changes on /configadvanced

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This commit is contained in:
zzz
2017-11-26 20:54:44 +00:00
parent 6a48910935
commit 03588e7648
2 changed files with 30 additions and 6 deletions
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28
apps/routerconsole/java/src/net/i2p/router/web/ConfigAdvancedHandler.java
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@ -3,6 +3,8 @@ package net.i2p.router.web;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
@ -17,7 +19,7 @@ import net.i2p.router.networkdb.kademlia.FloodfillNetworkDatabaseFacade;
public class ConfigAdvancedHandler extends FormHandler {
//private boolean _forceRestart;
private boolean _shouldSave;
private String _config;
private String _oldConfig, _config;
private String _ff;
@Override
@ -44,17 +46,25 @@ public class ConfigAdvancedHandler extends FormHandler {
public void setNofilter_config(String val) {
_config = val;
}
/** @since 0.9.33 */
public void setNofilter_oldConfig(String val) {
_oldConfig = val;
}
/**
* The user made changes to the config and wants to save them, so
* lets go ahead and do so.
*
* We saved the previous config in the form, so we do a diff between the two.
* This will reduce the chance of undoing some change that happened in-between.
*/
private void saveChanges() {
Set<String> unsetKeys = new HashSet<String>(_context.router().getConfigSettings());
if (_config != null) {
if (_oldConfig != null && _config != null) {
Properties oldProps = new Properties();
Properties props = new Properties();
try {
DataHelper.loadProps(oldProps, new ByteArrayInputStream(DataHelper.getUTF8(_oldConfig)));
DataHelper.loadProps(props, new ByteArrayInputStream(DataHelper.getUTF8(_config)));
} catch (IOException ioe) {
_log.error("Config error", ioe);
@ -63,9 +73,19 @@ public class ConfigAdvancedHandler extends FormHandler {
return;
}
for (String key : props.stringPropertyNames()) {
Set<String> unsetKeys = new HashSet<String>(oldProps.stringPropertyNames());
for (Iterator<Map.Entry<Object, Object>> iter = props.entrySet().iterator(); iter.hasNext(); ) {
Map.Entry<Object, Object> e = iter.next();
String key = (String) e.getKey();
String nnew = (String) e.getValue();
String old = oldProps.getProperty(key);
unsetKeys.remove(key);
if (nnew.equals(old)) {
// no change
iter.remove();
}
}
// what's remaining in unsetKeys will be deleted
boolean saved = _context.router().saveConfig(props, unsetKeys);
if (saved)