Add plugin slash command support (#7941)

* add plugin slash command support

* remove unused string

* rebase

plugin/rpcplugin/api.go

@@ -32,6 +32,14 @@ func (api *LocalAPI) LoadPluginConfiguration(args struct{}, reply *[]byte) error
 	return nil
 }
 
+func (api *LocalAPI) RegisterCommand(args *model.Command, reply *APITeamReply) error {
+	return api.api.RegisterCommand(args)
+}
+
+func (api *LocalAPI) UnregisterCommand(args *APIUnregisterCommandArgs, reply *APITeamReply) error {
+	return api.api.UnregisterCommand(args.TeamId, args.Trigger)
+}
+
 type APIErrorReply struct {
 	Error *model.AppError
 }
@@ -344,6 +352,22 @@ func (api *RemoteAPI) LoadPluginConfiguration(dest interface{}) error {
 	return json.Unmarshal(config, dest)
 }
 
+func (api *RemoteAPI) RegisterCommand(command *model.Command) error {
+	return api.client.Call("LocalAPI.RegisterCommand", command, nil)
+}
+
+type APIUnregisterCommandArgs struct {
+	TeamId  string
+	Trigger string
+}
+
+func (api *RemoteAPI) UnregisterCommand(teamId, trigger string) error {
+	return api.client.Call("LocalAPI.UnregisterCommand", &APIUnregisterCommandArgs{
+		TeamId:  teamId,
+		Trigger: trigger,
+	}, nil)
+}
+
 func (api *RemoteAPI) CreateUser(user *model.User) (*model.User, *model.AppError) {
 	var reply APIUserReply
 	if err := api.client.Call("LocalAPI.CreateUser", user, &reply); err != nil {

plugin/rpcplugin/api_test.go

@@ -2,6 +2,7 @@ package rpcplugin
 
 import (
 	"encoding/json"
+	"fmt"
 	"io"
 	"net/http"
 	"testing"
@@ -84,6 +85,16 @@ func TestAPI(t *testing.T) {
 		assert.Equal(t, "foo", config.Foo)
 		assert.Equal(t, "baz", config.Bar.Baz)
 
+		api.On("RegisterCommand", mock.AnythingOfType("*model.Command")).Return(fmt.Errorf("foo")).Once()
+		assert.Error(t, remote.RegisterCommand(&model.Command{}))
+		api.On("RegisterCommand", mock.AnythingOfType("*model.Command")).Return(nil).Once()
+		assert.NoError(t, remote.RegisterCommand(&model.Command{}))
+
+		api.On("UnregisterCommand", "team", "trigger").Return(fmt.Errorf("foo")).Once()
+		assert.Error(t, remote.UnregisterCommand("team", "trigger"))
+		api.On("UnregisterCommand", "team", "trigger").Return(nil).Once()
+		assert.NoError(t, remote.UnregisterCommand("team", "trigger"))
+
 		api.On("CreateChannel", mock.AnythingOfType("*model.Channel")).Return(func(c *model.Channel) (*model.Channel, *model.AppError) {
 			c.Id = "thechannelid"
 			return c, nil

plugin/rpcplugin/hooks.go

@@ -11,6 +11,7 @@ import (
 	"net/rpc"
 	"reflect"
 
+	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/plugin"
 )
 
@@ -125,6 +126,20 @@ func (h *LocalHooks) ServeHTTP(args ServeHTTPArgs, reply *struct{}) error {
 	return nil
 }
 
+type HooksExecuteCommandReply struct {
+	Response *model.CommandResponse
+	Error    *model.AppError
+}
+
+func (h *LocalHooks) ExecuteCommand(args *model.CommandArgs, reply *HooksExecuteCommandReply) error {
+	if hook, ok := h.hooks.(interface {
+		ExecuteCommand(*model.CommandArgs) (*model.CommandResponse, *model.AppError)
+	}); ok {
+		reply.Response, reply.Error = hook.ExecuteCommand(args)
+	}
+	return nil
+}
+
 func ServeHooks(hooks interface{}, conn io.ReadWriteCloser, muxer *Muxer) {
 	server := rpc.NewServer()
 	server.Register(&LocalHooks{
@@ -141,6 +156,7 @@ const (
 	remoteOnDeactivate          = 1
 	remoteServeHTTP             = 2
 	remoteOnConfigurationChange = 3
+	remoteExecuteCommand        = 4
 	maxRemoteHookCount          = iota
 )
 
@@ -225,6 +241,17 @@ func (h *RemoteHooks) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (h *RemoteHooks) ExecuteCommand(args *model.CommandArgs) (*model.CommandResponse, *model.AppError) {
+	if !h.implemented[remoteExecuteCommand] {
+		return nil, model.NewAppError("RemoteHooks.ExecuteCommand", "plugin.rpcplugin.invocation.error", nil, "err=ExecuteCommand hook not implemented", http.StatusInternalServerError)
+	}
+	var reply HooksExecuteCommandReply
+	if err := h.client.Call("LocalHooks.ExecuteCommand", args, &reply); err != nil {
+		return nil, model.NewAppError("RemoteHooks.ExecuteCommand", "plugin.rpcplugin.invocation.error", nil, "err="+err.Error(), http.StatusInternalServerError)
+	}
+	return reply.Response, reply.Error
+}
+
 func (h *RemoteHooks) Close() error {
 	if h.apiCloser != nil {
 		h.apiCloser.Close()
@@ -253,6 +280,8 @@ func ConnectHooks(conn io.ReadWriteCloser, muxer *Muxer) (*RemoteHooks, error) {
 			remote.implemented[remoteOnConfigurationChange] = true
 		case "ServeHTTP":
 			remote.implemented[remoteServeHTTP] = true
+		case "ExecuteCommand":
+			remote.implemented[remoteExecuteCommand] = true
 		}
 	}
 	return remote, nil

plugin/rpcplugin/hooks_test.go

@@ -13,6 +13,7 @@ import (
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
 
+	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/plugin"
 	"github.com/mattermost/mattermost-server/plugin/plugintest"
 )
@@ -79,6 +80,17 @@ func TestHooks(t *testing.T) {
 		body, err := ioutil.ReadAll(resp.Body)
 		assert.NoError(t, err)
 		assert.Equal(t, "bar", string(body))
+
+		hooks.On("ExecuteCommand", &model.CommandArgs{
+			Command: "/foo",
+		}).Return(&model.CommandResponse{
+			Text: "bar",
+		}, nil)
+		commandResponse, appErr := hooks.ExecuteCommand(&model.CommandArgs{
+			Command: "/foo",
+		})
+		assert.Equal(t, "bar", commandResponse.Text)
+		assert.Nil(t, appErr)
 	}))
 }