Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/config/migrate.go

@@ -0,0 +1,69 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package config
+
+import (
+	"github.com/pkg/errors"
+)
+
+// Migrate migrates SAML keys, certificates, and other config files from one store to another given their data source names.
+func Migrate(from, to string) error {
+	source, err := NewStoreFromDSN(from, false, nil, false)
+	if err != nil {
+		return errors.Wrapf(err, "failed to access source config %s", from)
+	}
+	defer source.Close()
+
+	destination, err := NewStoreFromDSN(to, false, nil, true)
+	if err != nil {
+		return errors.Wrapf(err, "failed to access destination config %s", to)
+	}
+	defer destination.Close()
+
+	sourceConfig := source.Get()
+	if _, _, err = destination.Set(sourceConfig); err != nil {
+		return errors.Wrapf(err, "failed to set config")
+	}
+
+	files := []string{
+		*sourceConfig.SamlSettings.IdpCertificateFile,
+		*sourceConfig.SamlSettings.PublicCertificateFile,
+		*sourceConfig.SamlSettings.PrivateKeyFile,
+	}
+
+	// Only migrate advanced logging config if it is not embedded JSON.
+	if !isJSONMap(*sourceConfig.LogSettings.AdvancedLoggingConfig) {
+		files = append(files, *sourceConfig.LogSettings.AdvancedLoggingConfig)
+	}
+
+	files = append(files, sourceConfig.PluginSettings.SignaturePublicKeyFiles...)
+
+	for _, file := range files {
+		if err := migrateFile(file, source, destination); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func migrateFile(name string, source *Store, destination *Store) error {
+	fileExists, err := source.HasFile(name)
+	if err != nil {
+		return errors.Wrapf(err, "failed to check existence of %s", name)
+	}
+
+	if fileExists {
+		file, err := source.GetFile(name)
+		if err != nil {
+			return errors.Wrapf(err, "failed to migrate %s", name)
+		}
+		err = destination.SetFile(name, file)
+		if err != nil {
+			return errors.Wrapf(err, "failed to migrate %s", name)
+		}
+	}
+
+	return nil
+}