moved some http code to pkg

pkg/http/multihandler.go

@@ -0,0 +1,31 @@
+package http
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// MutliHandler takes a map of http methods to handlers
+// and returns a handler which will run the the mapped hander
+// based on a request's method
+func MutliHandler(h map[string]http.Handler) (http.HandlerFunc, error) {
+	m := map[string]bool{
+		http.MethodHead:    true,
+		http.MethodPost:    true,
+		http.MethodPut:     true,
+		http.MethodPatch:   true,
+		http.MethodDelete:  true,
+		http.MethodConnect: true,
+		http.MethodOptions: true,
+		http.MethodTrace:   true,
+	}
+
+	for verb := range h {
+		if _, ok := m[verb]; !ok {
+			return nil, fmt.Errorf("invalid HTTP method: %s", verb)
+		}
+	}
+	return func(w http.ResponseWriter, r *http.Request) {
+		h[r.Method].ServeHTTP(w, r)
+	}, nil
+}