[MM-40935] Add OnInstall() plugin hook (#19499)

app/app_iface.go

@@ -438,7 +438,7 @@ type AppIface interface {
 	CompareAndDeletePluginKey(pluginID string, key string, oldValue []byte) (bool, *model.AppError)
 	CompareAndSetPluginKey(pluginID string, key string, oldValue, newValue []byte) (bool, *model.AppError)
 	CompleteOAuth(c *request.Context, service string, body io.ReadCloser, teamID string, props map[string]string, tokenUser *model.User) (*model.User, *model.AppError)
-	CompleteOnboarding(request *model.CompleteOnboardingRequest) *model.AppError
+	CompleteOnboarding(c *request.Context, request *model.CompleteOnboardingRequest) *model.AppError
 	CompleteSwitchWithOAuth(service string, userData io.Reader, email string, tokenUser *model.User) (*model.User, *model.AppError)
 	Compliance() einterfaces.ComplianceInterface
 	Config() *model.Config

app/onboarding.go

@@ -7,18 +7,21 @@ import (
 	"net/http"
 	"sync"
 
+	"github.com/mattermost/mattermost-server/v6/app/request"
 	"github.com/mattermost/mattermost-server/v6/model"
 	"github.com/mattermost/mattermost-server/v6/shared/mlog"
 )
 
-func (a *App) CompleteOnboarding(request *model.CompleteOnboardingRequest) *model.AppError {
-	var wg sync.WaitGroup
-
-	if !*a.Config().PluginSettings.Enable {
-		return model.NewAppError("completeOnboarding", "app.plugin.disabled.app_error", nil, "", http.StatusNotImplemented)
+func (a *App) CompleteOnboarding(c *request.Context, request *model.CompleteOnboardingRequest) *model.AppError {
+	pluginsEnvironment := a.Channels().GetPluginsEnvironment()
+	if pluginsEnvironment == nil {
+		return model.NewAppError("CompleteOnboarding", "app.plugin.disabled.app_error", nil, "", http.StatusNotImplemented)
 	}
 
-	for _, id := range request.InstallPlugins {
+	pluginContext := pluginContext(c)
+
+	var wg sync.WaitGroup
+	for _, pluginID := range request.InstallPlugins {
 		wg.Add(1)
 
 		go func(id string) {
@@ -37,7 +40,20 @@ func (a *App) CompleteOnboarding(request *model.CompleteOnboardingRequest) *mode
 				mlog.Error("Failed to enable plugin for onboarding", mlog.String("id", id), mlog.Err(appErr))
 				return
 			}
-		}(id)
+
+			hooks, err := pluginsEnvironment.HooksForPlugin(id)
+			if err != nil {
+				mlog.Warn("Getting hooks for plugin failed", mlog.String("plugin_id", id), mlog.Err(err))
+				return
+			}
+
+			event := model.OnInstallEvent{
+				UserId: c.Session().UserId,
+			}
+			if err = hooks.OnInstall(pluginContext, event); err != nil {
+				mlog.Error("Plugin OnInstall hook failed", mlog.String("plugin_id", id), mlog.Err(err))
+			}
+		}(pluginID)
 	}
 
 	wg.Wait()

app/opentracing/opentracing_layer.go

@@ -1671,7 +1671,7 @@ func (a *OpenTracingAppLayer) CompleteOAuth(c *request.Context, service string,
 	return resultVar0, resultVar1
 }
 
-func (a *OpenTracingAppLayer) CompleteOnboarding(request *model.CompleteOnboardingRequest) *model.AppError {
+func (a *OpenTracingAppLayer) CompleteOnboarding(c *request.Context, request *model.CompleteOnboardingRequest) *model.AppError {
 	origCtx := a.ctx
 	span, newCtx := tracing.StartSpanWithParentByContext(a.ctx, "app.CompleteOnboarding")
 
@@ -1683,7 +1683,7 @@ func (a *OpenTracingAppLayer) CompleteOnboarding(request *model.CompleteOnboardi
 	}()
 
 	defer span.Finish()
-	resultVar0 := a.app.CompleteOnboarding(request)
+	resultVar0 := a.app.CompleteOnboarding(c, request)
 
 	if resultVar0 != nil {
 		span.LogFields(spanlog.Error(resultVar0))