add rest authorization header support

headers.go

@@ -0,0 +1,31 @@
+package rest
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// IsAuthenticated returns true if the bearer token in a request's authorization is equal to a user-defined token.
+// This function always returns true if the user-defined token is empty i.e. no authentication required.
+func IsAuthenticated(req *http.Request, token string) bool {
+	if token == "" {
+		return true
+	}
+
+	read := ReadBearerToken(req)
+	return read == token
+}
+
+// ReadBearerToken reads the token portion of a bearer token in a request's authorization header.
+// This function returns an empty string if the header is not provided or is not a bearer token.
+func ReadBearerToken(req *http.Request) string {
+	header := req.Header.Get("authorization")
+	if len(header) > 8 {
+		bearer := header[0:7]
+		fmt.Println(bearer)
+		if bearer == "bearer " || bearer == "Bearer " {
+			return header[7:]
+		}
+	}
+	return ""
+}