From 6a6e05073eef02b9ba362fd98427dcba0d715f4b Mon Sep 17 00:00:00 2001
From: Doug Lauder <wiggin77@warpmail.net>
Date: Tue, 23 Aug 2022 11:57:07 -0400
Subject: [PATCH] Add preferences service API for products (#20869)

---
 app/channels.go   |  4 ++++
 app/preference.go | 21 +++++++++++++++++++++
 app/server.go     |  1 +
 product/api.go    |  9 +++++++++
 4 files changed, 35 insertions(+)

diff --git a/app/channels.go b/app/channels.go
index 332f975922..4bb8cd7de0 100644
--- a/app/channels.go
+++ b/app/channels.go
@@ -226,6 +226,10 @@ func NewChannels(s *Server, services map[ServiceKey]any) (*Channels, error) {
 
 	services[UserKey] = &App{ch: ch}
 
+	services[PreferencesKey] = &preferencesServiceWrapper{
+		app: &App{ch: ch},
+	}
+
 	return ch, nil
 }
 
diff --git a/app/preference.go b/app/preference.go
index f86a40a615..c6bfee0b58 100644
--- a/app/preference.go
+++ b/app/preference.go
@@ -9,8 +9,29 @@ import (
 	"net/http"
 
 	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/product"
 )
 
+// Ensure preferences service wrapper implements `product.PreferencesService`
+var _ product.PreferencesService = (*preferencesServiceWrapper)(nil)
+
+// preferencesServiceWrapper provides an implementation of `product.PreferencesService` for use by products.
+type preferencesServiceWrapper struct {
+	app AppIface
+}
+
+func (w *preferencesServiceWrapper) GetPreferencesForUser(userID string) (model.Preferences, *model.AppError) {
+	return w.app.GetPreferencesForUser(userID)
+}
+
+func (w *preferencesServiceWrapper) UpdatePreferencesForUser(userID string, preferences model.Preferences) *model.AppError {
+	return w.app.UpdatePreferences(userID, preferences)
+}
+
+func (w *preferencesServiceWrapper) DeletePreferencesForUser(userID string, preferences model.Preferences) *model.AppError {
+	return w.app.DeletePreferences(userID, preferences)
+}
+
 func (a *App) GetPreferencesForUser(userID string) (model.Preferences, *model.AppError) {
 	preferences, err := a.Srv().Store.Preference().GetAll(userID)
 	if err != nil {
diff --git a/app/server.go b/app/server.go
index e00d8743c9..bcb0e63c97 100644
--- a/app/server.go
+++ b/app/server.go
@@ -103,6 +103,7 @@ const (
 	KVStoreKey       ServiceKey = "kvstore"
 	StoreKey         ServiceKey = "storekey"
 	SystemKey        ServiceKey = "systemkey"
+	PreferencesKey   ServiceKey = "preferenceskey"
 )
 
 type Server struct {
diff --git a/product/api.go b/product/api.go
index 33da6c5899..4b4ec8a93c 100644
--- a/product/api.go
+++ b/product/api.go
@@ -179,3 +179,12 @@ type StoreService interface {
 type SystemService interface {
 	GetDiagnosticId() string
 }
+
+// PreferencesService is the API for accessing the Preferences service APIs.
+//
+// The service shall be registered via app.PreferencesKey service key.
+type PreferencesService interface {
+	GetPreferencesForUser(userID string) (model.Preferences, *model.AppError)
+	UpdatePreferencesForUser(userID string, preferences model.Preferences) *model.AppError
+	DeletePreferencesForUser(userID string, preferences model.Preferences) *model.AppError
+}