Allow for user specific themes (#5668)

* add migration and basic UI for changing a user's theme

* update user themem

* use right text on button

* load theme based on users' selection

* load theme based on users' selection in pwa too

* update sample config

* delete older theme loading

* implement AfterLoad to set users' theme properly

* set up default theme when creating a user. This uses the installation wide theme

* use flash messages for error

* set default theme when creating a user from the cli

* fix @lunny review

1 files changed, 25 insertions, 1 deletions

diff --git a/modules/auth/user_form.go b/modules/auth/user_form.go
index c281672fe1..f59b795b4e 100644
--- a/modules/auth/user_form.go
+++ b/modules/auth/user_form.go
@@ -12,7 +12,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 
 	"github.com/go-macaron/binding"
-	"gopkg.in/macaron.v1"
+	macaron "gopkg.in/macaron.v1"
 )
 
 // InstallForm form for installation page
@@ -189,6 +189,30 @@ func (f *AddEmailForm) Validate(ctx *macaron.Context, errs binding.Errors) bindi
 	return validate(errs, ctx.Data, f, ctx.Locale)
 }
 
+// UpdateThemeForm form for updating a users' theme
+type UpdateThemeForm struct {
+	Theme string `binding:"Required;MaxSize(30)"`
+}
+
+// Validate validates the field
+func (f *UpdateThemeForm) Validate(ctx *macaron.Context, errs binding.Errors) binding.Errors {
+	return validate(errs, ctx.Data, f, ctx.Locale)
+}
+
+// IsThemeExists checks if the theme is a theme available in the config.
+func (f UpdateThemeForm) IsThemeExists() bool {
+	var exists bool
+
+	for _, v := range setting.UI.Themes {
+		if strings.ToLower(v) == strings.ToLower(f.Theme) {
+			exists = true
+			break
+		}
+	}
+
+	return exists
+}
+
 // ChangePasswordForm form for changing password
 type ChangePasswordForm struct {
 	OldPassword string `form:"old_password" binding:"MaxSize(255)"`