Add Basic Auth session loader middleware

pkg/middleware/session_utils.go

@@ -0,0 +1,33 @@
+package middleware
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strings"
+)
+
+// splitAuthHeader takes the auth header value and splits it into the token type
+// and the token value.
+func splitAuthHeader(header string) (string, string, error) {
+	s := strings.Split(header, " ")
+	if len(s) != 2 {
+		return "", "", fmt.Errorf("invalid authorization header: %q", header)
+	}
+	return s[0], s[1], nil
+}
+
+// getBasicAuthCredentials decodes a basic auth token and extracts the user
+// and password pair.
+func getBasicAuthCredentials(token string) (string, string, error) {
+	b, err := base64.StdEncoding.DecodeString(token)
+	if err != nil {
+		return "", "", fmt.Errorf("invalid basic auth token: %v", err)
+	}
+
+	pair := strings.SplitN(string(b), ":", 2)
+	if len(pair) != 2 {
+		return "", "", fmt.Errorf("invalid format: %q", b)
+	}
+	// user, password
+	return pair[0], pair[1], nil
+}