HttpService/Frontend improvements (#782)

- zenhttp: added `GetServiceUri()`/`GetExternalHost()`
  - enables code to quickly generate an externally reachable URI for a given service
- frontend: improved Uri handling (better defaults)
  - added support for 404 page (to make it easier to find a good URL)

1 files changed, 23 insertions, 1 deletions

diff --git a/src/zenhttp/httpserver.cpp b/src/zenhttp/httpserver.cpp
index f2fe4738f..3cefa0ad8 100644
--- a/src/zenhttp/httpserver.cpp
+++ b/src/zenhttp/httpserver.cpp
@@ -23,6 +23,7 @@
 #include <zencore/logging.h>
 #include <zencore/stream.h>
 #include <zencore/string.h>
+#include <zencore/system.h>
 #include <zencore/testing.h>
 #include <zencore/thread.h>
 #include <zenhttp/packageformat.h>
@@ -1014,7 +1015,28 @@ HttpRequestRouter::HandleRequest(zen::HttpServerRequest& Request)
 int
 HttpServer::Initialize(int BasePort, std::filesystem::path DataDir)
 {
-	return OnInitialize(BasePort, std::move(DataDir));
+	m_EffectivePort = OnInitialize(BasePort, std::move(DataDir));
+	m_ExternalHost	= OnGetExternalHost();
+	return m_EffectivePort;
+}
+
+std::string
+HttpServer::OnGetExternalHost() const
+{
+	return GetMachineName();
+}
+
+std::string
+HttpServer::GetServiceUri(const HttpService* Service) const
+{
+	if (Service)
+	{
+		return fmt::format("http://{}:{}{}", m_ExternalHost, m_EffectivePort, Service->BaseUri());
+	}
+	else
+	{
+		return fmt::format("http://{}:{}", m_ExternalHost, m_EffectivePort);
+	}
 }
 
 void