Add temporary authentication via environment variables (#639)

#633

Co-authored-by: Tim Riedl <mail@tim-riedl.de>
Co-authored-by: techknowlogick <techknowlogick@noreply.gitea.com>
Co-authored-by: Lunny Xiao <lunny@noreply.gitea.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://gitea.com/gitea/tea/pulls/639
Co-authored-by: Tim Riedl <uvulpos@noreply.gitea.com>
Co-committed-by: Tim Riedl <uvulpos@noreply.gitea.com>

modules/utils/validate.go

@@ -0,0 +1,38 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package utils
+
+import (
+	"fmt"
+	"net/url"
+)
+
+// ValidateAuthenticationMethod checks the provided authentication method parameters
+func ValidateAuthenticationMethod(
+	giteaURL string,
+	token string,
+	user string,
+	passwd string,
+	sshAgent bool,
+	sshKey string,
+	sshCertPrincipal string,
+) (*url.URL, error) {
+	// Normalize URL
+	serverURL, err := NormalizeURL(giteaURL)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to parse URL: %s", err)
+	}
+
+	if !sshAgent && sshCertPrincipal == "" && sshKey == "" {
+		// .. if we have enough information to authenticate
+		if len(token) == 0 && (len(user)+len(passwd)) == 0 {
+			return nil, fmt.Errorf("No token set")
+		} else if len(user) != 0 && len(passwd) == 0 {
+			return nil, fmt.Errorf("No password set")
+		} else if len(user) == 0 && len(passwd) != 0 {
+			return nil, fmt.Errorf("No user set")
+		}
+	}
+	return serverURL, nil
+}