GH-15624: Added plugin hooks for ReationHasBeenAdded and ReactionHasBeenRemoved (#15765)

app/plugin_hooks_test.go

@@ -1131,3 +1131,89 @@ func TestHookMetrics(t *testing.T) {
 		metricsMock.AssertExpectations(t)
 	})
 }
+
+func TestHookReactionHasBeenAdded(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+
+	var mockAPI plugintest.API
+	mockAPI.On("LoadPluginConfiguration", mock.Anything).Return(nil)
+	mockAPI.On("LogDebug", "smile").Return(nil)
+
+	tearDown, _, _ := SetAppEnvironmentWithPlugins(t,
+		[]string{
+			`
+		package main
+
+		import (
+			"github.com/mattermost/mattermost-server/v5/plugin"
+			"github.com/mattermost/mattermost-server/v5/model"
+		)
+
+		type MyPlugin struct {
+			plugin.MattermostPlugin
+		}
+
+		func (p *MyPlugin) ReactionHasBeenAdded(c *plugin.Context, reaction *model.Reaction) {
+			p.API.LogDebug(reaction.EmojiName)
+		}
+
+		func main() {
+			plugin.ClientMain(&MyPlugin{})
+		}
+	`}, th.App, func(*model.Manifest) plugin.API { return &mockAPI })
+	defer tearDown()
+
+	reaction := &model.Reaction{
+		UserId:    th.BasicUser.Id,
+		PostId:    th.BasicPost.Id,
+		EmojiName: "smile",
+		CreateAt:  model.GetMillis() - 10000,
+	}
+	_, err := th.App.SaveReactionForPost(reaction)
+	require.Nil(t, err)
+}
+
+func TestHookReactionHasBeenRemoved(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+
+	var mockAPI plugintest.API
+	mockAPI.On("LoadPluginConfiguration", mock.Anything).Return(nil)
+	mockAPI.On("LogDebug", "star").Return(nil)
+
+	tearDown, _, _ := SetAppEnvironmentWithPlugins(t,
+		[]string{
+			`
+		package main
+
+		import (
+			"github.com/mattermost/mattermost-server/v5/plugin"
+			"github.com/mattermost/mattermost-server/v5/model"
+		)
+
+		type MyPlugin struct {
+			plugin.MattermostPlugin
+		}
+
+		func (p *MyPlugin) ReactionHasBeenRemoved(c *plugin.Context, reaction *model.Reaction) {
+			p.API.LogDebug(reaction.EmojiName)
+		}
+
+		func main() {
+			plugin.ClientMain(&MyPlugin{})
+		}
+	`}, th.App, func(*model.Manifest) plugin.API { return &mockAPI })
+	defer tearDown()
+
+	reaction := &model.Reaction{
+		UserId:    th.BasicUser.Id,
+		PostId:    th.BasicPost.Id,
+		EmojiName: "star",
+		CreateAt:  model.GetMillis() - 10000,
+	}
+
+	err := th.App.DeleteReactionForPost(reaction)
+
+	require.Nil(t, err)
+}

app/reaction.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 
 	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/mattermost/mattermost-server/v5/plugin"
 )
 
 func (a *App) SaveReactionForPost(reaction *model.Reaction) (*model.Reaction, *model.AppError) {
@@ -51,6 +52,16 @@ func (a *App) SaveReactionForPost(reaction *model.Reaction) (*model.Reaction, *m
 	// The post is always modified since the UpdateAt always changes
 	a.invalidateCacheForChannelPosts(post.ChannelId)
 
+	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
+		a.Srv().Go(func() {
+			pluginContext := a.PluginContext()
+			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
+				hooks.ReactionHasBeenAdded(pluginContext, reaction)
+				return true
+			}, plugin.ReactionHasBeenAddedId)
+		})
+	}
+
 	a.Srv().Go(func() {
 		a.sendReactionEvent(model.WEBSOCKET_EVENT_REACTION_ADDED, reaction, post, true)
 	})
@@ -132,6 +143,16 @@ func (a *App) DeleteReactionForPost(reaction *model.Reaction) *model.AppError {
 	// The post is always modified since the UpdateAt always changes
 	a.invalidateCacheForChannelPosts(post.ChannelId)
 
+	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
+		a.Srv().Go(func() {
+			pluginContext := a.PluginContext()
+			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
+				hooks.ReactionHasBeenRemoved(pluginContext, reaction)
+				return true
+			}, plugin.ReactionHasBeenRemovedId)
+		})
+	}
+
 	a.Srv().Go(func() {
 		a.sendReactionEvent(model.WEBSOCKET_EVENT_REACTION_REMOVED, reaction, post, hasReactions)
 	})