feat: support mysql tls option (merge coaidev#168 from @navee)

支持MySql tls连接

config.example.yaml

@@ -4,6 +4,7 @@ mysql:
   password: chatnio123456
   port: 3306
   user: root
+  tls: false
 
 redis:
   host: localhost

connection/database.go

@@ -3,8 +3,10 @@ package connection
 import (
 	"chat/globals"
 	"chat/utils"
+	"crypto/tls"
 	"database/sql"
 	"fmt"
+	"github.com/go-sql-driver/mysql"
 	_ "github.com/go-sql-driver/mysql"
 	_ "github.com/mattn/go-sqlite3"
 	"github.com/spf13/viper"
@@ -32,15 +34,25 @@ func getConn() *sql.DB {
 		return db
 	}
 
-	// connect to MySQL
-	db, err := sql.Open("mysql", fmt.Sprintf(
+	mysqlUrl := fmt.Sprintf(
 		"%s:%s@tcp(%s:%d)/%s",
 		viper.GetString("mysql.user"),
 		viper.GetString("mysql.password"),
 		viper.GetString("mysql.host"),
 		viper.GetInt("mysql.port"),
 		viper.GetString("mysql.db"),
-	))
+	)
+	if viper.GetBool("mysql.tls") {
+		mysql.RegisterTLSConfig("tls", &tls.Config{
+			MinVersion: tls.VersionTLS12,
+			ServerName: viper.GetString("mysql.host"),
+		})
+
+		mysqlUrl += "?tls=tls"
+	}
+
+	// connect to MySQL
+	db, err := sql.Open("mysql", mysqlUrl)
 
 	if pingErr := db.Ping(); err != nil || pingErr != nil {
 		errMsg := utils.Multi[string](err != nil, utils.GetError(err), utils.GetError(pingErr)) // err.Error() may contain nil pointer