Refactor handler packages

To help with packaging, the handlers in pkg/api/handlers are now found
in pkg/api/handler/compat.

Signed-off-by: Jhon Honce <jhonce@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/pkg/api/handlers/compat/ping.go b/pkg/api/handlers/compat/ping.go
new file mode 100644
index 000000000..6e77e270f
--- /dev/null
+++ b/pkg/api/handlers/compat/ping.go
@@ -0,0 +1,31 @@
+package compat
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/containers/buildah"
+	"github.com/containers/libpod/pkg/api/handlers"
+)
+
+// Ping returns headers to client about the service
+//
+// This handler must always be the same for the compatibility and libpod URL trees!
+// Clients will use the Header availability to test which backend engine is in use.
+func Ping(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("API-Version", handlers.DefaultApiVersion)
+	w.Header().Set("BuildKit-Version", "")
+	w.Header().Set("Docker-Experimental", "true")
+	w.Header().Set("Cache-Control", "no-cache")
+	w.Header().Set("Pragma", "no-cache")
+
+	// API-Version and Libpod-API-Version may not always be equal
+	w.Header().Set("Libpod-API-Version", handlers.DefaultApiVersion)
+	w.Header().Set("Libpod-Buildha-Version", buildah.Version)
+	w.WriteHeader(http.StatusOK)
+
+	if r.Method == http.MethodGet {
+		fmt.Fprint(w, "OK")
+	}
+	fmt.Fprint(w, "\n")
+}