1 files changed, 84 insertions, 0 deletions
diff --git a/src/main/java/com/btr/proxy/util/ProxyUtil.java b/src/main/java/com/btr/proxy/util/ProxyUtil.java
new file mode 100644
index 0000000..aad9293
--- /dev/null
+++ b/src/main/java/com/btr/proxy/util/ProxyUtil.java
@@ -0,0 +1,84 @@
+package com.btr.proxy.util;
+
+import java.net.Proxy;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.btr.proxy.selector.fixed.FixedProxySelector;
+import com.btr.proxy.selector.pac.PacProxySelector;
+import com.btr.proxy.selector.pac.PacScriptSource;
+import com.btr.proxy.selector.pac.UrlPacScriptSource;
+
+/*****************************************************************************
+ * Small helper class for some common utility methods.
+ *
+ * @author Bernd Rosstauscher (proxyvole@rosstauscher.de) Copyright 2009
+ ****************************************************************************/
+
+public class ProxyUtil {
+	
+	public static final int DEFAULT_PROXY_PORT = 80;
+	
+	private static List<Proxy> noProxyList;
+    private static Pattern pattern = Pattern.compile("\\w*?:?/*([^:/]+):?(\\d*)/?");
+	
+	/*************************************************************************
+	 * Parse host and port out of a proxy variable.
+	 * @param proxyVar the proxy string. example: http://192.168.10.9:8080/
+	 * @return a FixedProxySelector using this settings, null on parse error.
+	 ************************************************************************/
+	
+	public static FixedProxySelector parseProxySettings(String proxyVar) {
+		if (proxyVar == null || proxyVar.trim().length() == 0) {
+			return null;
+		}
+		Matcher matcher = pattern.matcher(proxyVar);
+		if (matcher.matches()) {
+		    String host = matcher.group(1);
+		    int port;
+		    if (!"".equals(matcher.group(2))) {
+		        port = Integer.parseInt(matcher.group(2));
+		    } else {
+		        port = DEFAULT_PROXY_PORT;
+		    }
+            return new FixedProxySelector(host.trim(), port);
+		} else {
+		    return null;
+		}
+	}
+	
+	/*************************************************************************
+	 * Gets an unmodifiable proxy list that will have as it's only entry an DIRECT proxy.
+	 * @return a list with a DIRECT proxy in it.
+	 ************************************************************************/
+	
+	public static synchronized List<Proxy> noProxyList() {
+		if (noProxyList == null) {
+			ArrayList<Proxy> list = new ArrayList<Proxy>(1);
+			list.add(Proxy.NO_PROXY);
+			noProxyList = Collections.unmodifiableList(list);
+		}
+		return noProxyList;
+	}
+	
+	/*************************************************************************
+	 * Build a PAC proxy selector for the given URL.
+	 * @param url to fetch the PAC script from.
+	 * @return a PacProxySelector or null if it is not possible to build a working
+	 * selector.
+	 ************************************************************************/
+	
+	public static PacProxySelector buildPacSelectorForUrl(String url) {
+		PacProxySelector result = null;
+		PacScriptSource pacSource = new UrlPacScriptSource(url);
+		if (pacSource.isScriptValid()) {
+			result = new PacProxySelector(pacSource);
+		}
+		return result;
+	}
+	
+
+}