problem: don't want to run my server as root to bind to privileged po…

…rts (e.g. 80, 443).

solution: support privilege drop after socket bind via new --user <username> parameter.

bin/node-http-proxy

@@ -16,6 +16,7 @@ var help = [
     "  --target HOST:PORT  Location of the server the proxy will target",
     "  --config OUTFILE    Location of the configuration file for the proxy server",
     "  --silent            Silence the log output from the proxy server",
+    "  --user   USER       User to drop privileges to once server socket is bound",
     "  -h, --help          You're staring at it"
 ].join('\n');
 
@@ -24,8 +25,10 @@ if (argv.h || argv.help || Object.keys(argv).length === 2) {
 }
 
 var location, config = {},
-    port = argv.port || 80, 
-    target = argv.target;
+    port = argv.port || 80,
+    target = argv.target
+    user = argv.user
+    ;
 
 //
 // If we were passed a config, parse it
@@ -79,6 +82,14 @@ else {
 //
 server.listen(port);
 
+
+//
+// Drop privileges if requested
+//
+if (typeof user === 'string') {
+    process.setuid(user);
+}
+
 //
 // Notify that the server is started
 //