EXT-5480: Support secondlife:///app/region SLapps.

This is defined to work exactly like the classic secondlife://{REGION}
Slurl. However, the later syntax cannot support spaces in the region
name because spaces (and %20 chars) are illegal in the hostname of an
http URL. Some browsers let you get away with this, but some do not
(such as Qt's Webkit). Hence we have decided to introduce the newer
secondlife:///app/region alternative.

indra/newview/llviewerregion.cpp

@@ -49,6 +49,7 @@
 #include "llagent.h"
 #include "llcallingcard.h"
 #include "llcaphttpsender.h"
+#include "llcommandhandler.h"
 #include "lldir.h"
 #include "lleventpoll.h"
 #include "llfloatergodtools.h"
@@ -58,6 +59,7 @@
 #include "llsdutil.h"
 #include "llstartup.h"
 #include "lltrans.h"
+#include "llurldispatcher.h"
 #include "llviewerobjectlist.h"
 #include "llviewerparceloverlay.h"
 #include "llvlmanager.h"
@@ -82,6 +84,45 @@ extern BOOL gNoRender;
 const F32 WATER_TEXTURE_SCALE = 8.f;			//  Number of times to repeat the water texture across a region
 const S16 MAX_MAP_DIST = 10;
 
+// support for secondlife:///app/region/{REGION} SLapps
+// N.B. this is defined to work exactly like the classic secondlife://{REGION}
+// However, the later syntax cannot support spaces in the region name because
+// spaces (and %20 chars) are illegal in the hostname of an http URL. Some
+// browsers let you get away with this, but some do not (such as Qt's Webkit).
+// Hence we introduced the newer secondlife:///app/region alternative.
+class LLRegionHandler : public LLCommandHandler
+{
+public:
+	// requests will be throttled from a non-trusted browser
+	LLRegionHandler() : LLCommandHandler("region", UNTRUSTED_THROTTLE) {}
+
+	bool handle(const LLSD& params, const LLSD& query_map, LLMediaCtrl* web)
+	{
+		// make sure that we at least have a region name
+		int num_params = params.size();
+		if (num_params < 1)
+		{
+			return false;
+		}
+
+		// build a secondlife://{PLACE} SLurl from this SLapp
+		std::string url = "secondlife://";
+		for (int i = 0; i < num_params; i++)
+		{
+			if (i > 0)
+			{
+				url += "/";
+			}
+			url += params[i].asString();
+		}
+
+		// Process the SLapp as if it was a secondlife://{PLACE} SLurl
+		LLURLDispatcher::dispatch(url, web, true);
+		return true;
+	}
+};
+LLRegionHandler gRegionHandler;
+
 class BaseCapabilitiesComplete : public LLHTTPClient::Responder
 {
 	LOG_CLASS(BaseCapabilitiesComplete);