PLT-3143 Added serverside code for custom Emoji (#3311)

* Added model objects for emoji

* Added database tables for emoji

* Added settings for custom emoji

* Added serverside APIs and unit tests for custom emoji

* Added additional validation to catch duplicate emoji names earlier on

* Added additional validation to prevent users from adding emoji as another user

store/sql_emoji_store.go

@@ -0,0 +1,169 @@
+// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package store
+
+import (
+	"github.com/mattermost/platform/model"
+)
+
+type SqlEmojiStore struct {
+	*SqlStore
+}
+
+func NewSqlEmojiStore(sqlStore *SqlStore) EmojiStore {
+	s := &SqlEmojiStore{sqlStore}
+
+	for _, db := range sqlStore.GetAllConns() {
+		table := db.AddTableWithName(model.Emoji{}, "Emoji").SetKeys(false, "Id")
+		table.ColMap("Id").SetMaxSize(26)
+		table.ColMap("CreatorId").SetMaxSize(26)
+		table.ColMap("Name").SetMaxSize(64)
+
+		table.SetUniqueTogether("Name", "DeleteAt")
+	}
+
+	return s
+}
+
+func (es SqlEmojiStore) UpgradeSchemaIfNeeded() {
+}
+
+func (es SqlEmojiStore) CreateIndexesIfNotExists() {
+}
+
+func (es SqlEmojiStore) Save(emoji *model.Emoji) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		emoji.PreSave()
+		if result.Err = emoji.IsValid(); result.Err != nil {
+			storeChannel <- result
+			close(storeChannel)
+			return
+		}
+
+		if err := es.GetMaster().Insert(emoji); err != nil {
+			result.Err = model.NewLocAppError("SqlEmojiStore.Save", "store.sql_emoji.save.app_error", nil, "id="+emoji.Id+", "+err.Error())
+		} else {
+			result.Data = emoji
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (es SqlEmojiStore) Get(id string) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		var emoji *model.Emoji
+
+		if err := es.GetReplica().SelectOne(&emoji,
+			`SELECT
+				*
+			FROM
+				Emoji
+			WHERE
+				Id = :Id
+				AND DeleteAt = 0`, map[string]interface{}{"Id": id}); err != nil {
+			result.Err = model.NewLocAppError("SqlEmojiStore.Get", "store.sql_emoji.get.app_error", nil, "id="+id+", "+err.Error())
+		} else {
+			result.Data = emoji
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (es SqlEmojiStore) GetByName(name string) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		var emoji *model.Emoji
+
+		if err := es.GetReplica().SelectOne(&emoji,
+			`SELECT
+				*
+			FROM
+				Emoji
+			WHERE
+				Name = :Name
+				AND DeleteAt = 0`, map[string]interface{}{"Name": name}); err != nil {
+			result.Err = model.NewLocAppError("SqlEmojiStore.GetByName", "store.sql_emoji.get_by_name.app_error", nil, "name="+name+", "+err.Error())
+		} else {
+			result.Data = emoji
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (es SqlEmojiStore) GetAll() StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		var emoji []*model.Emoji
+
+		if _, err := es.GetReplica().Select(&emoji,
+			`SELECT
+				*
+			FROM
+				Emoji
+			WHERE
+				DeleteAt = 0`); err != nil {
+			result.Err = model.NewLocAppError("SqlEmojiStore.Get", "store.sql_emoji.get_all.app_error", nil, err.Error())
+		} else {
+			result.Data = emoji
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}
+
+func (es SqlEmojiStore) Delete(id string, time int64) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+
+		if sqlResult, err := es.GetMaster().Exec(
+			`Update
+				Emoji
+			SET
+				DeleteAt = :DeleteAt,
+				UpdateAt = :UpdateAt
+			WHERE
+				Id = :Id
+				AND DeleteAt = 0`, map[string]interface{}{"DeleteAt": time, "UpdateAt": time, "Id": id}); err != nil {
+			result.Err = model.NewLocAppError("SqlEmojiStore.Delete", "store.sql_emoji.delete.app_error", nil, "id="+id+", err="+err.Error())
+		} else if rows, _ := sqlResult.RowsAffected(); rows == 0 {
+			result.Err = model.NewLocAppError("SqlEmojiStore.Delete", "store.sql_emoji.delete.no_results", nil, "id="+id+", err="+err.Error())
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}