PLT-1378 Initial version of emoji reactions (#4520)

* Refactored emoji.json to support multiple aliases and emoji categories

* Added custom category to emoji.jsx and stabilized all fields

* Removed conflicting aliases for :mattermost: and :ca:

* fixup after store changes

* Added emoji reactions

* Removed reactions for an emoji when that emoji is deleted

* Fixed incorrect test case

* Renamed ReactionList to ReactionListView

* Fixed :+1: and :-1: not showing up as possible reactions

* Removed text emoticons from emoji reaction autocomplete

* Changed emoji reactions to be sorted by the order that they were first created

* Set a maximum number of listeners for the ReactionStore

* Removed unused code from Textbox component

* Fixed reaction permissions

* Changed error code when trying to modify reactions for another user

* Fixed merge conflicts

* Properly applied theme colours to reactions

* Fixed ESLint and gofmt errors

* Fixed ReactionListContainer to properly update when its post prop changes

* Removed unnecessary escape characters from reaction regexes

* Shared reaction message pattern between CreatePost and CreateComment

* Removed an unnecessary select query when saving a reaction

* Changed reactions route to be under /reactions

* Fixed copyright dates on newly added files

* Removed debug code that prevented all unit tests from being ran

* Cleaned up unnecessary code for reactions

* Renamed ReactionStore.List to ReactionStore.GetForPost

5 files changed, 531 insertions, 0 deletions

diff --git a/store/sql_reaction_store.go b/store/sql_reaction_store.go
new file mode 100644
index 000000000..7bd063a15
--- /dev/null
+++ b/store/sql_reaction_store.go
@@ -0,0 +1,230 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package store
+
+import (
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/utils"
+
+	l4g "github.com/alecthomas/log4go"
+	"github.com/go-gorp/gorp"
+)
+
+type SqlReactionStore struct {
+	*SqlStore
+}
+
+func NewSqlReactionStore(sqlStore *SqlStore) ReactionStore {
+	s := &SqlReactionStore{sqlStore}
+
+	for _, db := range sqlStore.GetAllConns() {
+		table := db.AddTableWithName(model.Reaction{}, "Reactions").SetKeys(false, "UserId", "PostId", "EmojiName")
+		table.ColMap("UserId").SetMaxSize(26)
+		table.ColMap("PostId").SetMaxSize(26)
+		table.ColMap("EmojiName").SetMaxSize(64)
+	}
+
+	return s
+}
+
+func (s SqlReactionStore) CreateIndexesIfNotExists() {
+	s.CreateIndexIfNotExists("idx_reactions_post_id", "Reactions", "PostId")
+}
+
+func (s SqlReactionStore) Save(reaction *model.Reaction) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		reaction.PreSave()
+		if result.Err = reaction.IsValid(); result.Err != nil {
+			storeChannel <- result
+			close(storeChannel)
+			return
+		}
+
+		if transaction, err := s.GetMaster().Begin(); err != nil {
+			result.Err = model.NewLocAppError("SqlReactionStore.Save", "store.sql_reaction.save.begin.app_error", nil, err.Error())
+		} else {
+			err := saveReactionAndUpdatePost(transaction, reaction)
+
+			if err != nil {
+				transaction.Rollback()
+
+				// We don't consider duplicated save calls as an error
+				if !IsUniqueConstraintError(err.Error(), []string{"reactions_pkey", "PRIMARY"}) {
+					result.Err = model.NewLocAppError("SqlPreferenceStore.Save", "store.sql_reaction.save.save.app_error", nil, err.Error())
+				}
+			} else {
+				if err := transaction.Commit(); err != nil {
+					// don't need to rollback here since the transaction is already closed
+					result.Err = model.NewLocAppError("SqlPreferenceStore.Save", "store.sql_preference.save.commit.app_error", nil, err.Error())
+				}
+			}
+
+			if result.Err == nil {
+				result.Data = reaction
+			}
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (s SqlReactionStore) Delete(reaction *model.Reaction) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		if transaction, err := s.GetMaster().Begin(); err != nil {
+			result.Err = model.NewLocAppError("SqlReactionStore.Delete", "store.sql_reaction.delete.begin.app_error", nil, err.Error())
+		} else {
+			err := deleteReactionAndUpdatePost(transaction, reaction)
+
+			if err != nil {
+				transaction.Rollback()
+
+				result.Err = model.NewLocAppError("SqlPreferenceStore.Delete", "store.sql_reaction.delete.app_error", nil, err.Error())
+			} else if err := transaction.Commit(); err != nil {
+				// don't need to rollback here since the transaction is already closed
+				result.Err = model.NewLocAppError("SqlPreferenceStore.Delete", "store.sql_preference.delete.commit.app_error", nil, err.Error())
+			} else {
+				result.Data = reaction
+			}
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func saveReactionAndUpdatePost(transaction *gorp.Transaction, reaction *model.Reaction) error {
+	if err := transaction.Insert(reaction); err != nil {
+		return err
+	}
+
+	return updatePostForReactions(transaction, reaction.PostId)
+}
+
+func deleteReactionAndUpdatePost(transaction *gorp.Transaction, reaction *model.Reaction) error {
+	if _, err := transaction.Exec(
+		`DELETE FROM
+			Reactions
+		WHERE
+			PostId = :PostId AND
+			UserId = :UserId AND
+			EmojiName = :EmojiName`,
+		map[string]interface{}{"PostId": reaction.PostId, "UserId": reaction.UserId, "EmojiName": reaction.EmojiName}); err != nil {
+		return err
+	}
+
+	return updatePostForReactions(transaction, reaction.PostId)
+}
+
+const (
+	// Set HasReactions = true if and only if the post has reactions, update UpdateAt only if HasReactions changes
+	UPDATE_POST_HAS_REACTIONS_QUERY = `UPDATE
+			Posts
+		SET
+			UpdateAt = (CASE
+				WHEN HasReactions != (SELECT count(0) > 0 FROM Reactions WHERE PostId = :PostId) THEN :UpdateAt
+				ELSE UpdateAt
+			END),
+			HasReactions = (SELECT count(0) > 0 FROM Reactions WHERE PostId = :PostId)
+		WHERE
+			Id = :PostId`
+)
+
+func updatePostForReactions(transaction *gorp.Transaction, postId string) error {
+	_, err := transaction.Exec(UPDATE_POST_HAS_REACTIONS_QUERY, map[string]interface{}{"PostId": postId, "UpdateAt": model.GetMillis()})
+
+	return err
+}
+
+func (s SqlReactionStore) GetForPost(postId string) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		var reactions []*model.Reaction
+
+		if _, err := s.GetReplica().Select(&reactions,
+			`SELECT
+				*
+			FROM
+				Reactions
+			WHERE
+				PostId = :PostId
+			ORDER BY
+				CreateAt`, map[string]interface{}{"PostId": postId}); err != nil {
+			result.Err = model.NewLocAppError("SqlReactionStore.GetForPost", "store.sql_reaction.get_for_post.app_error", nil, "")
+		} else {
+			result.Data = reactions
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (s SqlReactionStore) DeleteAllWithEmojiName(emojiName string) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		// doesn't use a transaction since it's better for this to half-finish than to not commit anything
+		var reactions []*model.Reaction
+
+		if _, err := s.GetReplica().Select(&reactions,
+			`SELECT
+				*
+			FROM
+				Reactions
+			WHERE
+				EmojiName = :EmojiName`, map[string]interface{}{"EmojiName": emojiName}); err != nil {
+			result.Err = model.NewLocAppError("SqlReactionStore.DeleteAllWithEmojiName",
+				"store.sql_reaction.delete_all_with_emoji_name.get_reactions.app_error", nil,
+				"emoji_name="+emojiName+", error="+err.Error())
+			storeChannel <- result
+			close(storeChannel)
+			return
+		}
+
+		if _, err := s.GetMaster().Exec(
+			`DELETE FROM
+				Reactions
+			WHERE
+				EmojiName = :EmojiName`, map[string]interface{}{"EmojiName": emojiName}); err != nil {
+			result.Err = model.NewLocAppError("SqlReactionStore.DeleteAllWithEmojiName",
+				"store.sql_reaction.delete_all_with_emoji_name.delete_reactions.app_error", nil,
+				"emoji_name="+emojiName+", error="+err.Error())
+			storeChannel <- result
+			close(storeChannel)
+			return
+		}
+
+		for _, reaction := range reactions {
+			if _, err := s.GetMaster().Exec(UPDATE_POST_HAS_REACTIONS_QUERY,
+				map[string]interface{}{"PostId": reaction.PostId, "UpdateAt": model.GetMillis()}); err != nil {
+				l4g.Warn(utils.T("store.sql_reaction.delete_all_with_emoji_name.update_post.warn"), reaction.PostId, err.Error())
+			}
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
diff --git a/store/sql_reaction_store_test.go b/store/sql_reaction_store_test.go
new file mode 100644
index 000000000..5a1cb2d67
--- /dev/null
+++ b/store/sql_reaction_store_test.go
@@ -0,0 +1,270 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package store
+
+import (
+	"github.com/mattermost/platform/model"
+	"testing"
+)
+
+func TestReactionSave(t *testing.T) {
+	Setup()
+
+	post := Must(store.Post().Save(&model.Post{
+		ChannelId: model.NewId(),
+		UserId:    model.NewId(),
+	})).(*model.Post)
+	firstUpdateAt := post.UpdateAt
+
+	reaction1 := &model.Reaction{
+		UserId:    model.NewId(),
+		PostId:    post.Id,
+		EmojiName: model.NewId(),
+	}
+	if result := <-store.Reaction().Save(reaction1); result.Err != nil {
+		t.Fatal(result.Err)
+	} else if saved := result.Data.(*model.Reaction); saved.UserId != reaction1.UserId ||
+		saved.PostId != reaction1.PostId || saved.EmojiName != reaction1.EmojiName {
+		t.Fatal("should've saved reaction and returned it")
+	}
+
+	var secondUpdateAt int64
+	if postList := Must(store.Post().Get(reaction1.PostId)).(*model.PostList); !postList.Posts[post.Id].HasReactions {
+		t.Fatal("should've set HasReactions = true on post")
+	} else if postList.Posts[post.Id].UpdateAt == firstUpdateAt {
+		t.Fatal("should've marked post as updated when HasReactions changed")
+	} else {
+		secondUpdateAt = postList.Posts[post.Id].UpdateAt
+	}
+
+	if result := <-store.Reaction().Save(reaction1); result.Err != nil {
+		t.Log(result.Err)
+		t.Fatal("should've allowed saving a duplicate reaction")
+	}
+
+	// different user
+	reaction2 := &model.Reaction{
+		UserId:    model.NewId(),
+		PostId:    reaction1.PostId,
+		EmojiName: reaction1.EmojiName,
+	}
+	if result := <-store.Reaction().Save(reaction2); result.Err != nil {
+		t.Fatal(result.Err)
+	}
+
+	if postList := Must(store.Post().Get(reaction2.PostId)).(*model.PostList); postList.Posts[post.Id].UpdateAt != secondUpdateAt {
+		t.Fatal("shouldn't mark as updated when HasReactions hasn't changed")
+	}
+
+	// different post
+	reaction3 := &model.Reaction{
+		UserId:    reaction1.UserId,
+		PostId:    model.NewId(),
+		EmojiName: reaction1.EmojiName,
+	}
+	if result := <-store.Reaction().Save(reaction3); result.Err != nil {
+		t.Fatal(result.Err)
+	}
+
+	// different emoji
+	reaction4 := &model.Reaction{
+		UserId:    reaction1.UserId,
+		PostId:    reaction1.PostId,
+		EmojiName: model.NewId(),
+	}
+	if result := <-store.Reaction().Save(reaction4); result.Err != nil {
+		t.Fatal(result.Err)
+	}
+
+	// invalid reaction
+	reaction5 := &model.Reaction{
+		UserId: reaction1.UserId,
+		PostId: reaction1.PostId,
+	}
+	if result := <-store.Reaction().Save(reaction5); result.Err == nil {
+		t.Fatal("should've failed for invalid reaction")
+	}
+}
+
+func TestReactionDelete(t *testing.T) {
+	Setup()
+
+	post := Must(store.Post().Save(&model.Post{
+		ChannelId: model.NewId(),
+		UserId:    model.NewId(),
+	})).(*model.Post)
+
+	reaction := &model.Reaction{
+		UserId:    model.NewId(),
+		PostId:    post.Id,
+		EmojiName: model.NewId(),
+	}
+
+	Must(store.Reaction().Save(reaction))
+	firstUpdateAt := Must(store.Post().Get(reaction.PostId)).(*model.PostList).Posts[post.Id].UpdateAt
+
+	if result := <-store.Reaction().Delete(reaction); result.Err != nil {
+		t.Fatal(result.Err)
+	}
+
+	if result := <-store.Reaction().GetForPost(post.Id); result.Err != nil {
+		t.Fatal(result.Err)
+	} else if len(result.Data.([]*model.Reaction)) != 0 {
+		t.Fatal("should've deleted reaction")
+	}
+
+	if postList := Must(store.Post().Get(post.Id)).(*model.PostList); postList.Posts[post.Id].HasReactions {
+		t.Fatal("should've set HasReactions = false on post")
+	} else if postList.Posts[post.Id].UpdateAt == firstUpdateAt {
+		t.Fatal("shouldn't mark as updated when HasReactions has changed after deleting reactions")
+	}
+}
+
+func TestReactionGetForPost(t *testing.T) {
+	Setup()
+
+	postId := model.NewId()
+
+	userId := model.NewId()
+
+	reactions := []*model.Reaction{
+		{
+			UserId:    userId,
+			PostId:    postId,
+			EmojiName: "smile",
+		},
+		{
+			UserId:    model.NewId(),
+			PostId:    postId,
+			EmojiName: "smile",
+		},
+		{
+			UserId:    userId,
+			PostId:    postId,
+			EmojiName: "sad",
+		},
+		{
+			UserId:    userId,
+			PostId:    model.NewId(),
+			EmojiName: "angry",
+		},
+	}
+
+	for _, reaction := range reactions {
+		Must(store.Reaction().Save(reaction))
+	}
+
+	if result := <-store.Reaction().GetForPost(postId); result.Err != nil {
+		t.Fatal(result.Err)
+	} else if returned := result.Data.([]*model.Reaction); len(returned) != 3 {
+		t.Fatal("should've returned 3 reactions")
+	} else {
+		for _, reaction := range reactions {
+			found := false
+
+			for _, returnedReaction := range returned {
+				if returnedReaction.UserId == reaction.UserId && returnedReaction.PostId == reaction.PostId &&
+					returnedReaction.EmojiName == reaction.EmojiName {
+					found = true
+					break
+				}
+			}
+
+			if !found && reaction.PostId == postId {
+				t.Fatalf("should've returned reaction for post %v", reaction)
+			} else if found && reaction.PostId != postId {
+				t.Fatal("shouldn't have returned reaction for another post")
+			}
+		}
+	}
+}
+
+func TestReactionDeleteAllWithEmojiName(t *testing.T) {
+	Setup()
+
+	emojiToDelete := model.NewId()
+
+	post := Must(store.Post().Save(&model.Post{
+		ChannelId: model.NewId(),
+		UserId:    model.NewId(),
+	})).(*model.Post)
+	post2 := Must(store.Post().Save(&model.Post{
+		ChannelId: model.NewId(),
+		UserId:    model.NewId(),
+	})).(*model.Post)
+	post3 := Must(store.Post().Save(&model.Post{
+		ChannelId: model.NewId(),
+		UserId:    model.NewId(),
+	})).(*model.Post)
+
+	userId := model.NewId()
+
+	reactions := []*model.Reaction{
+		{
+			UserId:    userId,
+			PostId:    post.Id,
+			EmojiName: emojiToDelete,
+		},
+		{
+			UserId:    model.NewId(),
+			PostId:    post.Id,
+			EmojiName: emojiToDelete,
+		},
+		{
+			UserId:    userId,
+			PostId:    post.Id,
+			EmojiName: "sad",
+		},
+		{
+			UserId:    userId,
+			PostId:    post2.Id,
+			EmojiName: "angry",
+		},
+		{
+			UserId:    userId,
+			PostId:    post3.Id,
+			EmojiName: emojiToDelete,
+		},
+	}
+
+	for _, reaction := range reactions {
+		Must(store.Reaction().Save(reaction))
+	}
+
+	if result := <-store.Reaction().DeleteAllWithEmojiName(emojiToDelete); result.Err != nil {
+		t.Fatal(result.Err)
+	}
+
+	// check that the reactions were deleted
+	if returned := Must(store.Reaction().GetForPost(post.Id)).([]*model.Reaction); len(returned) != 1 {
+		t.Fatal("should've only removed reactions with emoji name")
+	} else {
+		for _, reaction := range returned {
+			if reaction.EmojiName == "smile" {
+				t.Fatal("should've removed reaction with emoji name")
+			}
+		}
+	}
+
+	if returned := Must(store.Reaction().GetForPost(post2.Id)).([]*model.Reaction); len(returned) != 1 {
+		t.Fatal("should've only removed reactions with emoji name")
+	}
+
+	if returned := Must(store.Reaction().GetForPost(post3.Id)).([]*model.Reaction); len(returned) != 0 {
+		t.Fatal("should've only removed reactions with emoji name")
+	}
+
+	// check that the posts are updated
+	if postList := Must(store.Post().Get(post.Id)).(*model.PostList); !postList.Posts[post.Id].HasReactions {
+		t.Fatal("post should still have reactions")
+	}
+
+	if postList := Must(store.Post().Get(post2.Id)).(*model.PostList); !postList.Posts[post2.Id].HasReactions {
+		t.Fatal("post should still have reactions")
+	}
+
+	if postList := Must(store.Post().Get(post3.Id)).(*model.PostList); postList.Posts[post3.Id].HasReactions {
+		t.Fatal("post shouldn't have reactions any more")
+	}
+}
diff --git a/store/sql_store.go b/store/sql_store.go
index 215e0f894..6a852430c 100644
--- a/store/sql_store.go
+++ b/store/sql_store.go
@@ -84,6 +84,7 @@ type SqlStore struct {
 	emoji         EmojiStore
 	status        StatusStore
 	fileInfo      FileInfoStore
+	reaction      ReactionStore
 	SchemaVersion string
 	rrCounter     int64
 }
@@ -134,6 +135,7 @@ func NewSqlStore() Store {
 	sqlStore.emoji = NewSqlEmojiStore(sqlStore)
 	sqlStore.status = NewSqlStatusStore(sqlStore)
 	sqlStore.fileInfo = NewSqlFileInfoStore(sqlStore)
+	sqlStore.reaction = NewSqlReactionStore(sqlStore)
 
 	err := sqlStore.master.CreateTablesIfNotExists()
 	if err != nil {
@@ -161,6 +163,7 @@ func NewSqlStore() Store {
 	sqlStore.emoji.(*SqlEmojiStore).CreateIndexesIfNotExists()
 	sqlStore.status.(*SqlStatusStore).CreateIndexesIfNotExists()
 	sqlStore.fileInfo.(*SqlFileInfoStore).CreateIndexesIfNotExists()
+	sqlStore.reaction.(*SqlReactionStore).CreateIndexesIfNotExists()
 
 	sqlStore.preference.(*SqlPreferenceStore).DeleteUnusedFeatures()
 
@@ -676,6 +679,10 @@ func (ss *SqlStore) FileInfo() FileInfoStore {
 	return ss.fileInfo
 }
 
+func (ss *SqlStore) Reaction() ReactionStore {
+	return ss.reaction
+}
+
 func (ss *SqlStore) DropAllTables() {
 	ss.master.TruncateTables()
 }
diff --git a/store/sql_upgrade.go b/store/sql_upgrade.go
index 992fac189..38aac4299 100644
--- a/store/sql_upgrade.go
+++ b/store/sql_upgrade.go
@@ -15,6 +15,7 @@ import (
 )
 
 const (
+	VERSION_3_6_0 = "3.6.0"
 	VERSION_3_5_0 = "3.5.0"
 	VERSION_3_4_0 = "3.4.0"
 	VERSION_3_3_0 = "3.3.0"
@@ -37,6 +38,7 @@ func UpgradeDatabase(sqlStore *SqlStore) {
 	UpgradeDatabaseToVersion33(sqlStore)
 	UpgradeDatabaseToVersion34(sqlStore)
 	UpgradeDatabaseToVersion35(sqlStore)
+	UpgradeDatabaseToVersion36(sqlStore)
 
 	// If the SchemaVersion is empty this this is the first time it has ran
 	// so lets set it to the current version.
@@ -210,3 +212,17 @@ func UpgradeDatabaseToVersion35(sqlStore *SqlStore) {
 		saveSchemaVersion(sqlStore, VERSION_3_5_0)
 	}
 }
+
+func UpgradeDatabaseToVersion36(sqlStore *SqlStore) {
+	//if shouldPerformUpgrade(sqlStore, VERSION_3_5_0, VERSION_3_6_0) {
+
+	sqlStore.CreateColumnIfNotExists("Posts", "HasReactions", "tinyint", "boolean", "0")
+
+	// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	// TODO FIXME UNCOMMENT WHEN WE DO RELEASE
+	// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	//sqlStore.Session().RemoveAllSessions()
+
+	//saveSchemaVersion(sqlStore, VERSION_3_6_0)
+	//}
+}
diff --git a/store/store.go b/store/store.go
index ae938a797..7602be8f4 100644
--- a/store/store.go
+++ b/store/store.go
@@ -46,6 +46,7 @@ type Store interface {
 	Emoji() EmojiStore
 	Status() StatusStore
 	FileInfo() FileInfoStore
+	Reaction() ReactionStore
 	MarkSystemRanUnitTests()
 	Close()
 	DropAllTables()
@@ -310,3 +311,10 @@ type FileInfoStore interface {
 	AttachToPost(fileId string, postId string) StoreChannel
 	DeleteForPost(postId string) StoreChannel
 }
+
+type ReactionStore interface {
+	Save(reaction *model.Reaction) StoreChannel
+	Delete(reaction *model.Reaction) StoreChannel
+	GetForPost(postId string) StoreChannel
+	DeleteAllWithEmojiName(emojiName string) StoreChannel
+}