MM-12855 Plugin Context (#9922)

* Basic plugin context.

* Adding more useful fields to plugin context.

* Fix spelling

Co-Authored-By: crspeller <crspeller@gmail.com>

* Fixing location of context creation.

app/app.go

@@ -28,6 +28,8 @@ type App struct {
 	RequestId      string
 	IpAddress      string
 	Path           string
+	UserAgent      string
+	AcceptLanguage string
 
 	AccountMigration einterfaces.AccountMigrationInterface
 	Cluster          einterfaces.ClusterInterface

app/channel.go

@@ -213,7 +213,7 @@ func (a *App) CreateChannel(channel *model.Channel, addMember bool) (*model.Chan
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.ChannelHasBeenCreated(pluginContext, sc)
 				return true
@@ -243,7 +243,7 @@ func (a *App) GetOrCreateDirectChannel(userId, otherUserId string) (*model.Chann
 
 			if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 				a.Srv.Go(func() {
-					pluginContext := &plugin.Context{}
+					pluginContext := a.PluginContext()
 					pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 						hooks.ChannelHasBeenCreated(pluginContext, channel)
 						return true
@@ -866,7 +866,7 @@ func (a *App) AddChannelMember(userId string, channel *model.Channel, userReques
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.UserHasJoinedChannel(pluginContext, cm, userRequestor)
 				return true
@@ -1256,7 +1256,7 @@ func (a *App) JoinChannel(channel *model.Channel, userId string) *model.AppError
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.UserHasJoinedChannel(pluginContext, cm, nil)
 				return true
@@ -1462,7 +1462,7 @@ func (a *App) removeUserFromChannel(userIdToRemove string, removerUserId string,
 		}
 
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.UserHasLeftChannel(pluginContext, cm, actorUser)
 				return true

app/file.go

@@ -462,7 +462,7 @@ func (a *App) DoUploadFileExpectModification(now time.Time, rawTeamId string, ra
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		var rejectionError *model.AppError
-		pluginContext := &plugin.Context{}
+		pluginContext := a.PluginContext()
 		pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 			var newBytes bytes.Buffer
 			replacementInfo, rejectionReason := hooks.FileWillBeUploaded(pluginContext, info, bytes.NewReader(data), &newBytes)

app/login.go

@@ -68,7 +68,7 @@ func (a *App) AuthenticateUserForLogin(id, loginId, password, mfaToken string, l
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		var rejectionReason string
-		pluginContext := &plugin.Context{}
+		pluginContext := a.PluginContext()
 		pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 			rejectionReason = hooks.UserWillLogIn(pluginContext, user)
 			return rejectionReason == ""
@@ -79,7 +79,7 @@ func (a *App) AuthenticateUserForLogin(id, loginId, password, mfaToken string, l
 		}
 
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.UserHasLoggedIn(pluginContext, user)
 				return true

app/plugin_commands.go

@@ -9,7 +9,6 @@ import (
 	"strings"
 
 	"github.com/mattermost/mattermost-server/model"
-	"github.com/mattermost/mattermost-server/plugin"
 )
 
 type PluginCommand struct {
@@ -106,7 +105,7 @@ func (a *App) ExecutePluginCommand(args *model.CommandArgs) (*model.Command, *mo
 				if err != nil {
 					return pc.Command, nil, model.NewAppError("ExecutePluginCommand", "model.plugin_command.error.app_error", nil, "err="+err.Error(), http.StatusInternalServerError)
 				}
-				response, appErr := pluginHooks.ExecuteCommand(&plugin.Context{}, args)
+				response, appErr := pluginHooks.ExecuteCommand(a.PluginContext(), args)
 				return pc.Command, response, appErr
 			}
 		}

app/plugin_context.go

@@ -0,0 +1,17 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import "github.com/mattermost/mattermost-server/plugin"
+
+func (a *App) PluginContext() *plugin.Context {
+	context := &plugin.Context{
+		RequestId:      a.RequestId,
+		SessionId:      a.Session.Id,
+		IpAddress:      a.IpAddress,
+		AcceptLanguage: a.AcceptLanguage,
+		UserAgent:      a.UserAgent,
+	}
+	return context
+}

app/plugin_hooks_test.go

@@ -887,3 +887,62 @@ func TestErrorString(t *testing.T) {
 		require.Equal(t, expectedErr, cause)
 	})
 }
+
+func TestHookContext(t *testing.T) {
+	th := Setup().InitBasic()
+	defer th.TearDown()
+
+	// We don't actually have a session, we are faking it so just set something arbitrarily
+	th.App.Session.Id = model.NewId()
+	th.App.RequestId = model.NewId()
+	th.App.IpAddress = model.NewId()
+	th.App.AcceptLanguage = model.NewId()
+	th.App.UserAgent = model.NewId()
+
+	var mockAPI plugintest.API
+	mockAPI.On("LoadPluginConfiguration", mock.Anything).Return(nil)
+	mockAPI.On("LogDebug", th.App.Session.Id).Return(nil)
+	mockAPI.On("LogInfo", th.App.RequestId).Return(nil)
+	mockAPI.On("LogError", th.App.IpAddress).Return(nil)
+	mockAPI.On("LogWarn", th.App.AcceptLanguage).Return(nil)
+	mockAPI.On("DeleteTeam", th.App.UserAgent).Return(nil)
+
+	tearDown, _, _ := SetAppEnvironmentWithPlugins(t,
+		[]string{
+			`
+		package main
+
+		import (
+			"github.com/mattermost/mattermost-server/plugin"
+			"github.com/mattermost/mattermost-server/model"
+		)
+
+		type MyPlugin struct {
+			plugin.MattermostPlugin
+		}
+
+		func (p *MyPlugin) MessageHasBeenPosted(c *plugin.Context, post *model.Post) {
+			p.API.LogDebug(c.SessionId)
+			p.API.LogInfo(c.RequestId)
+			p.API.LogError(c.IpAddress)
+			p.API.LogWarn(c.AcceptLanguage)
+			p.API.DeleteTeam(c.UserAgent)
+		}
+
+		func main() {
+			plugin.ClientMain(&MyPlugin{})
+		}
+	`}, th.App, func(*model.Manifest) plugin.API { return &mockAPI })
+	defer tearDown()
+
+	post := &model.Post{
+		UserId:    th.BasicUser.Id,
+		ChannelId: th.BasicChannel.Id,
+		Message:   "not this",
+		CreateAt:  model.GetMillis() - 10000,
+	}
+	_, err := th.App.CreatePost(post, th.BasicChannel, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+}

app/plugin_requests.go

@@ -42,7 +42,12 @@ func (a *App) ServePluginRequest(w http.ResponseWriter, r *http.Request) {
 
 func (a *App) servePluginRequest(w http.ResponseWriter, r *http.Request, handler func(*plugin.Context, http.ResponseWriter, *http.Request)) {
 	token := ""
-	context := &plugin.Context{}
+	context := &plugin.Context{
+		RequestId:      model.NewId(),
+		IpAddress:      utils.GetIpAddress(r),
+		AcceptLanguage: r.Header.Get("Accept-Language"),
+		UserAgent:      r.UserAgent(),
+	}
 	cookieAuth := false
 
 	authHeader := r.Header.Get(model.HEADER_AUTH)

app/post.go

@@ -155,7 +155,7 @@ func (a *App) CreatePost(post *model.Post, channel *model.Channel, triggerWebhoo
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		var rejectionError *model.AppError
-		pluginContext := &plugin.Context{}
+		pluginContext := a.PluginContext()
 		pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 			replacementPost, rejectionReason := hooks.MessageWillBePosted(pluginContext, post)
 			if rejectionReason != "" {
@@ -181,7 +181,7 @@ func (a *App) CreatePost(post *model.Post, channel *model.Channel, triggerWebhoo
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.MessageHasBeenPosted(pluginContext, rpost)
 				return true
@@ -371,7 +371,7 @@ func (a *App) UpdatePost(post *model.Post, safeUpdate bool) (*model.Post, *model
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		var rejectionReason string
-		pluginContext := &plugin.Context{}
+		pluginContext := a.PluginContext()
 		pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 			newPost, rejectionReason = hooks.MessageWillBeUpdated(pluginContext, newPost, oldPost)
 			return post != nil
@@ -389,7 +389,7 @@ func (a *App) UpdatePost(post *model.Post, safeUpdate bool) (*model.Post, *model
 
 	if pluginsEnvironment := a.GetPluginsEnvironment(); pluginsEnvironment != nil {
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.MessageHasBeenUpdated(pluginContext, newPost, oldPost)
 				return true

app/team.go

@@ -468,7 +468,7 @@ func (a *App) JoinUserToTeam(team *model.Team, user *model.User, userRequestorId
 		}
 
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.UserHasJoinedTeam(pluginContext, tm, actor)
 				return true
@@ -791,7 +791,7 @@ func (a *App) LeaveTeam(team *model.Team, user *model.User, requestorId string)
 		}
 
 		a.Srv.Go(func() {
-			pluginContext := &plugin.Context{}
+			pluginContext := a.PluginContext()
 			pluginsEnvironment.RunMultiPluginHook(func(hooks plugin.Hooks) bool {
 				hooks.UserHasLeftTeam(pluginContext, teamMember, actor)
 				return true

plugin/context.go

@@ -4,8 +4,12 @@
 package plugin
 
 // Context passes through metadata about the request or hook event.
-//
+// For requests this is built in app/plugin_requests.go
-// It is currently a placeholder while the implementation details are sorted out.
+// For hooks, app.PluginContext() is called.
 type Context struct {
 	SessionId      string
+	RequestId      string
+	IpAddress      string
+	AcceptLanguage string
+	UserAgent      string
 }

web/context.go

@@ -12,7 +12,6 @@ import (
 	"github.com/mattermost/mattermost-server/app"
 	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
-	"github.com/mattermost/mattermost-server/plugin"
 	"github.com/mattermost/mattermost-server/utils"
 )
 
@@ -520,11 +519,3 @@ func (c *Context) RequireRoleName() *Context {
 
 	return c
 }
-
-func (c *Context) ToPluginContext() *plugin.Context {
-	return &plugin.Context{
-		//sessionId: c.Session.Id,
-		//requestId: c.RequestId,
-		//userIp: c.IpAddress,
-	}
-}

web/handlers.go

@@ -56,6 +56,8 @@ func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	c.App.T, _ = utils.GetTranslationsAndLocale(w, r)
 	c.App.RequestId = model.NewId()
 	c.App.IpAddress = utils.GetIpAddress(r)
+	c.App.UserAgent = r.UserAgent()
+	c.App.AcceptLanguage = r.Header.Get("Accept-Language")
 	c.Params = ParamsFromRequest(r)
 	c.App.Path = r.URL.Path
 	c.Log = c.App.Log