Prevent 500 when there is an error during new auth source post (#19041) (#19059)

Backport #19041

Fix #19036

Signed-off-by: Andrew Thornton <art27@cantab.net>

routers/web/admin/auths.go

@@ -93,7 +93,7 @@ func NewAuthSource(ctx *context.Context) {
 	ctx.Data["PageIsAdmin"] = true
 	ctx.Data["PageIsAdminAuthentications"] = true
 
-	ctx.Data["type"] = auth.LDAP
+	ctx.Data["type"] = auth.LDAP.Int()
 	ctx.Data["CurrentTypeName"] = auth.Names[auth.LDAP]
 	ctx.Data["CurrentSecurityProtocol"] = ldap.SecurityProtocolNames[ldap.SecurityProtocolUnencrypted]
 	ctx.Data["smtp_auth"] = "PLAIN"
@@ -112,7 +112,7 @@ func NewAuthSource(ctx *context.Context) {
 	ctx.Data["SSPIDefaultLanguage"] = ""
 
 	// only the first as default
-	ctx.Data["oauth2_provider"] = oauth2providers[0]
+	ctx.Data["oauth2_provider"] = oauth2providers[0].Name
 
 	ctx.HTML(http.StatusOK, tplAuthNew)
 }

templates/admin/auth/new.tmpl

@@ -14,7 +14,7 @@
 				<div class="inline required field {{if .Err_Type}}error{{end}}">
 					<label>{{.i18n.Tr "admin.auths.auth_type"}}</label>
 					<div class="ui selection type dropdown">
-						<input type="hidden" id="auth_type" name="type" value="{{.type.Int}}">
+						<input type="hidden" id="auth_type" name="type" value="{{.type}}">
 						<div class="text">{{.CurrentTypeName}}</div>
 						{{svg "octicon-triangle-down" 14 "dropdown icon"}}
 						<div class="menu">

templates/admin/auth/source/oauth.tmpl

@@ -2,8 +2,8 @@
 	<div class="inline required field">
 		<label>{{.i18n.Tr "admin.auths.oauth2_provider"}}</label>
 		<div class="ui selection type dropdown">
-			<input type="hidden" id="oauth2_provider" name="oauth2_provider" value="{{.oauth2_provider.Name}}">
-			<div class="text">{{.oauth2_provider.Name}}</div>
+			<input type="hidden" id="oauth2_provider" name="oauth2_provider" value="{{.oauth2_provider}}">
+			<div class="text">{{.oauth2_provider}}</div>
 			{{svg "octicon-triangle-down" 14 "dropdown icon"}}
 			<div class="menu">
 				{{range .OAuth2Providers}}