Merge pull request 'Some more changes for the new game handling api and also rate limiting' (#13 ) from game-handler into master

Reviewed-on: #13
Rate limit websocket connection
2024-05-12 13:48:22 +00:00 · 2024-05-12 15:42:40 +02:00 · 2024-05-12 15:37:53 +02:00 · 2024-05-12 15:36:30 +02:00 · 2024-05-11 22:57:47 +02:00 · 2024-05-11 17:17:50 +00:00
23 changed files with 61400 additions and 516 deletions
--- a/api/handler/handler.go
+++ b/api/handler/handler.go
@ -0,0 +1,142 @@
+package handler
+
+import (
+	"mchess_server/api"
+	"mchess_server/chess"
+	"mchess_server/lobbies"
+	"mchess_server/utils"
+	"net/http"
+	"sync"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"go.uber.org/ratelimit"
+)
+
+var mut sync.Mutex
+var limiter = ratelimit.New(10)
+
+func HostGameHandler(c *gin.Context) {
+	limiter.Take()
+
+	player := chess.NewPlayer(uuid.New())
+	u := lobbies.GetUsher()
+
+	mut.Lock()
+	defer mut.Unlock()
+	lobby := u.CreateNewPrivateLobby(player)
+	u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
+
+	passphrase := lobby.Passphrase.String()
+	info := api.PlayerInfo{
+		PlayerID:   &player.Uuid,
+		LobbyID:    &lobby.Uuid,
+		Passphrase: &passphrase,
+	}
+	c.Header("Access-Control-Allow-Origin", "*")
+	c.IndentedJSON(http.StatusOK, info)
+}
+
+func GetLobbyForPassphraseHandler(c *gin.Context) {
+	limiter.Take()
+
+	reqPassphrase := c.Param("phrase")
+	if reqPassphrase == "" {
+		c.IndentedJSON(http.StatusBadRequest, reqPassphrase)
+		return
+	}
+
+	passPhraseWithSpaces := utils.ConvertToPassphraseWithSpaces(reqPassphrase)
+	lobby := lobbies.GetLobbyRegistry().GetLobbyByPassphrase(passPhraseWithSpaces)
+
+	if lobby == nil {
+		c.IndentedJSON(http.StatusNotFound, reqPassphrase)
+		return
+	}
+
+	lobbyInfo := api.LobbyInfo{
+		ID: &lobby.Uuid,
+	}
+
+	c.IndentedJSON(http.StatusOK, lobbyInfo)
+}
+
+// TODO: this will be replaced by the JoinGameHandler()
+func JoinPrivateGame(c *gin.Context) {
+	limiter.Take()
+
+	req := api.PlayerInfo{}
+	err := c.ShouldBindJSON(&req)
+	if err != nil || req.Passphrase == nil || *req.Passphrase == "" {
+		c.IndentedJSON(http.StatusNotFound, req)
+	}
+
+	u := lobbies.GetUsher()
+
+	if req.Passphrase != nil &&
+		*req.Passphrase != "" &&
+		req.PlayerID != nil &&
+		req.LobbyID != nil { //is reconnect
+		lobby := u.FindExistingPrivateLobby(utils.Passphrase(*req.Passphrase))
+		_, found := lobby.GetPlayerByUUID(*req.PlayerID)
+		if found {
+			c.IndentedJSON(
+				http.StatusOK,
+				api.PlayerInfo{
+					PlayerID:   req.PlayerID,
+					LobbyID:    req.LobbyID,
+					Passphrase: req.Passphrase,
+				})
+			return
+		} else {
+			c.IndentedJSON(http.StatusNotFound, req)
+		}
+	}
+
+	player := chess.NewPlayer(uuid.New())
+
+	mut.Lock()
+	defer mut.Unlock()
+	lobby := u.FindExistingPrivateLobby(utils.Passphrase(*req.Passphrase))
+	if lobby != nil {
+		u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
+	} else {
+		c.IndentedJSON(http.StatusNotFound, req)
+		return
+	}
+
+	info := api.PlayerInfo{
+		PlayerID:   &player.Uuid,
+		LobbyID:    &lobby.Uuid,
+		Passphrase: req.Passphrase,
+	}
+	c.Header("Access-Control-Allow-Origin", "*")
+	c.IndentedJSON(http.StatusOK, info)
+}
+
+func JoinGameHandler(c *gin.Context) {
+	limiter.Take()
+
+	id := c.Param("id")
+	idAsUUID, err := uuid.Parse(id)
+	if err != nil {
+		c.IndentedJSON(http.StatusBadRequest, nil)
+		return
+	}
+
+	passphrase := api.Passphrase{}
+	c.ShouldBindJSON(&passphrase)
+
+	u := lobbies.GetUsher()
+	lobby := u.GetLobbyByID(idAsUUID)
+	if lobby == nil {
+		c.IndentedJSON(http.StatusNotFound, nil)
+		return
+	}
+
+	lobbyInfo := api.LobbyInfo{
+		ID: &lobby.Uuid,
+	}
+
+	c.IndentedJSON(http.StatusOK, lobbyInfo)
+}
--- a/api/handler/handler_test.go
+++ b/api/handler/handler_test.go
@ -0,0 +1,57 @@
+package handler
+
+import (
+	"encoding/json"
+	"mchess_server/api"
+	"mchess_server/utils"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_GetLobbyFromPassphraseHandler(t *testing.T) {
+	var passphraseURLParameter string
+	var hostedLobbyId uuid.UUID
+
+	t.Run("host a lobby", func(t *testing.T) {
+		r1 := httptest.NewRecorder()
+		ctx1, e1 := gin.CreateTestContext(r1)
+		e1.GET("/api/hostPrivate", HostGameHandler)
+		hostGameRequest, _ := http.NewRequest("GET", "/api/hostPrivate", nil)
+		ctx1.Request = hostGameRequest
+
+		e1.ServeHTTP(r1, hostGameRequest)
+
+		playerInfo := api.PlayerInfo{}
+		err := json.Unmarshal(r1.Body.Bytes(), &playerInfo)
+		assert.NoError(t, err)
+
+		receivedPhrase := *playerInfo.Passphrase
+		hostedLobbyId = *playerInfo.LobbyID
+
+		passphrase := utils.NewPassphraseFromString(receivedPhrase)
+		passphraseURLParameter = passphrase.AsURLParam()
+	})
+
+	t.Run("see if the lobby can be fetched by using the passphrase", func(t *testing.T) {
+		r2 := httptest.NewRecorder()
+		ctx2, engine := gin.CreateTestContext(r2)
+		engine.GET("/api/getLobbyForPassphrase/:phrase", GetLobbyForPassphraseHandler)
+
+		url := "/api/getLobbyForPassphrase/" + passphraseURLParameter
+		getLobbyRequest, _ := http.NewRequest("GET", url, nil)
+		ctx2.Request = getLobbyRequest
+
+		engine.ServeHTTP(r2, getLobbyRequest)
+
+		lobbyInfo := api.LobbyInfo{}
+		err := json.Unmarshal(r2.Body.Bytes(), &lobbyInfo)
+		assert.NoError(t, err)
+
+		assert.Equal(t, hostedLobbyId, *lobbyInfo.ID)
+	})
+}
--- a/api/handler/websocket.go
+++ b/api/handler/websocket.go
@ -0,0 +1,81 @@
+package handler
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"mchess_server/api"
+	"net/http"
+
+	"mchess_server/lobbies"
+
+	"github.com/gin-gonic/gin"
+	gorillaws "github.com/gorilla/websocket"
+)
+
+var upgrader = gorillaws.Upgrader{
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}
+
+func RegisterWebSocketConnection(c *gin.Context) {
+	limiter.Take()
+
+	log.Println(c.Request)
+	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	go waitForAndHandlePlayerID(c, conn)
+}
+
+func waitForAndHandlePlayerID(ctx context.Context, conn *gorillaws.Conn) {
+	limiter.Take()
+
+	msgType, msg, err := conn.ReadMessage()
+	if err != nil {
+		errorMessage := fmt.Sprintf("Reading from websocket connection did not work: %s", err)
+		log.Println(errorMessage)
+		conn.Close()
+		return
+	}
+
+	log.Println("read from websocket endpoint: ", msgType, string(msg), err)
+
+	var info api.PlayerInfo
+	err = json.Unmarshal(msg, &info)
+	if err != nil {
+		errorMessage := fmt.Sprintf("Unmarshaling message did not work: %s", err)
+		log.Println(errorMessage)
+		conn.WriteMessage(msgType, []byte(errorMessage))
+		conn.Close()
+		return
+	}
+
+	lobby := lobbies.GetLobbyRegistry().GetLobbyByUUID(*info.LobbyID)
+	if lobby == nil {
+		conn.WriteMessage(msgType, []byte("lobby not found"))
+		conn.Close()
+		return
+	}
+
+	player, found := lobby.GetPlayerByUUID(*info.PlayerID)
+	if !found {
+		conn.WriteMessage(msgType, []byte("player not found"))
+		conn.Close()
+		return
+	}
+	if player.Conn.HasWebsocketConnection() {
+		player.Conn.Close("closing existing connection")
+	}
+	lobby.Game.SetWebsocketConnectionFor(ctx, player, conn)
+	log.Println("player after setting connection: ", player)
+}
+
+func ConnectWsForGame(c *gin.Context) {
+	limiter.Take()
+
+}
--- a/api/lobby_info.go
+++ b/api/lobby_info.go
@ -0,0 +1,7 @@
+package api
+
+import "github.com/google/uuid"
+
+type LobbyInfo struct {
+	ID *uuid.UUID `json:"id,omitempty"`
+}
--- a/api/passphrase.go
+++ b/api/passphrase.go
@ -0,0 +1,5 @@
+package api
+
+type Passphrase struct {
+	Value *string `json:"value,omitempty"`
+}
--- a/chess/board.go
+++ b/chess/board.go
@ -80,9 +80,9 @@ func (b *Board) CheckAndPlay(move *types.Move) (bool, Violation) {
 		}
 	}

-	wasSpecialMove, err := tempBoard.handleSpecialMove(*move)
-	if err != nil {
-		return false, InvalidMove
+	wasSpecialMove, violation := tempBoard.handleSpecialMove(*move)
+	if violation != "" {
+		return false, violation
 	}

 	if !wasSpecialMove {
@ -188,21 +188,21 @@ func (p Position) getCopyOfPosition() Position {
 	return position
 }

-func (b *Board) handleSpecialMove(move types.Move) (bool, error) {
+func (b *Board) handleSpecialMove(move types.Move) (bool, Violation) {
 	var was bool
-	var err error
+	var violation Violation
 	var pieceAtStartSquare = b.getPieceAt(move.StartSquare)

 	switch piece := pieceAtStartSquare.(type) {
 	case Pawn:
-		was, err = piece.HandlePossiblePromotion(b, move)
+		was, violation = piece.HandlePossiblePromotion(b, move)
 		if !was {
-			was, err = piece.HandleEnPassant(b, move, b.getLastMove())
+			was, violation = piece.HandleEnPassant(b, move, b.getLastMove())
 		}
 	case King:
-		was, err = piece.HandleCastling(b, move)
+		was, violation = piece.HandleCastling(b, move)
 	}
-	return was, err
+	return was, violation
 }

 type GameEndedReason string
--- a/chess/board_castling_test.go
+++ b/chess/board_castling_test.go
@ -0,0 +1,329 @@
+package chess
+
+import (
+	"mchess_server/types"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Board_WhiteCastlesLeft(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 1, Row: 1}] = Rook{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.True(t, valid)
+}
+
+func Test_Board_WhiteCastlesRight(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 8, Row: 1}] = Rook{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 7, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.True(t, valid)
+}
+
+func Test_Board_BlackCastlesLeft(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 1, Row: 8}] = Rook{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 3, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.True(t, valid)
+}
+
+func Test_Board_BlackCastlesRight(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 8, Row: 8}] = Rook{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 7, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.True(t, valid)
+}
+
+func Test_Board_WhiteCastlesLeft_QueenCoversSquareInBetween(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 1, Row: 1}] = Rook{Color: types.White}
+	board.position[types.Coordinate{Col: 4, Row: 5}] = Queen{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_WhiteCastlesRight_QueenCoversSquareInBetween(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 8, Row: 1}] = Rook{Color: types.White}
+	board.position[types.Coordinate{Col: 6, Row: 5}] = Queen{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 7, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_WhiteCastlesLeft_KingInCheck(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 1, Row: 1}] = Rook{Color: types.White}
+	board.position[types.Coordinate{Col: 5, Row: 5}] = Queen{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, violation := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+	assert.Equal(t, CastlingWhileKingInCheck, violation)
+}
+
+func Test_Board_WhiteCastlesLeft_QueenCoversKingsSquare(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+	board.position[types.Coordinate{Col: 1, Row: 1}] = Rook{Color: types.White}
+	board.position[types.Coordinate{Col: 3, Row: 5}] = Queen{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_BlackCastlesLeft_QueenCoversSquareInBetween(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 1, Row: 8}] = Rook{Color: types.Black}
+	board.position[types.Coordinate{Col: 4, Row: 4}] = Queen{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 3, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_BlackCastlesRight_QueenCoversSquareInBetween(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 8, Row: 8}] = Rook{Color: types.Black}
+	board.position[types.Coordinate{Col: 6, Row: 4}] = Queen{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 7, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_BlackCastlesLeft_KingInCheck(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 1, Row: 8}] = Rook{Color: types.Black}
+	board.position[types.Coordinate{Col: 5, Row: 4}] = Queen{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 3, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, violation := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+	assert.Equal(t, CastlingWhileKingInCheck, violation)
+}
+
+func Test_Board_BlackCastlesLeft_QueenCoversKingsSquare(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+	board.position[types.Coordinate{Col: 1, Row: 8}] = Rook{Color: types.Black}
+	board.position[types.Coordinate{Col: 3, Row: 4}] = Queen{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 3, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_WhiteCastlesLeft_NoRook(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 3, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_WhiteCastlesRight_NoRook(t *testing.T) {
+	board := newBoard()
+
+	board.position[types.Coordinate{Col: 5, Row: 1}] = King{Color: types.White}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 1},
+		EndSquare:   types.Coordinate{Col: 7, Row: 1},
+		ColorMoved:  types.White,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_BlackCastlesLeft_NoRook(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	kingSquare := types.Coordinate{Col: 5, Row: 8}
+	kingDestinationSquare := types.Coordinate{Col: 3, Row: 8}
+
+	board.position[kingSquare] = King{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: kingSquare,
+		EndSquare:   kingDestinationSquare,
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+	assert.Equal(t, nil, board.getPieceAt(kingDestinationSquare))
+}
+
+func Test_Board_BlackCastlesRight_NoRook(t *testing.T) {
+	board := newBoard()
+	board.colorToMove = types.Black
+
+	board.position[types.Coordinate{Col: 5, Row: 8}] = King{Color: types.Black}
+
+	castling := types.Move{
+		StartSquare: types.Coordinate{Col: 5, Row: 8},
+		EndSquare:   types.Coordinate{Col: 7, Row: 8},
+		ColorMoved:  types.Black,
+	}
+
+	valid, _ := board.CheckAndPlay(&castling)
+
+	assert.False(t, valid)
+}
+
+func Test_Board_fixBugThatPreventsCastling(t *testing.T) {
+	board := newBoard()
+	board.Init()
+
+	//white move
+	valid, violation := board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 2}, EndSquare: types.Coordinate{Col: 5, Row: 3}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+	//black move
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 7}, EndSquare: types.Coordinate{Col: 5, Row: 6}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+	//white move
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 4, Row: 2}, EndSquare: types.Coordinate{Col: 4, Row: 3}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+	//black move
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 6, Row: 7}, EndSquare: types.Coordinate{Col: 6, Row: 6}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+	//queen moves to check the king
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 4, Row: 1}, EndSquare: types.Coordinate{Col: 8, Row: 5}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+
+	//this moves should be valid but it was not because of a bug
+	valid, violation = board.CheckAndPlay(&types.Move{StartSquare: types.Coordinate{Col: 5, Row: 8}, EndSquare: types.Coordinate{Col: 5, Row: 7}})
+	assert.True(t, valid)
+	assert.Empty(t, violation)
+}
--- a/chess/game.go
+++ b/chess/game.go
@ -8,8 +8,7 @@ import (
 	"mchess_server/types"

 	"github.com/google/uuid"
-	"github.com/samber/lo"
-	"nhooyr.io/websocket"
+	gorillaws "github.com/gorilla/websocket"
 )

 type Game struct {
@ -210,13 +209,8 @@ func (game Game) broadcastGameEnd(reason GameEndedReason) error {
 }

 func (game *Game) playerDisconnected(p *Player) {
-	log.Println(string(p.color), " disconnected")
-	playerStillInGame := lo.Filter(game.players, func(player *Player, _ int) bool {
-		return player.color != p.color
-	})
-	game.players = playerStillInGame
 }

-func (game *Game) SetWebsocketConnectionFor(ctx context.Context, p *Player, ws *websocket.Conn) {
+func (game *Game) SetWebsocketConnectionFor(ctx context.Context, p *Player, ws *gorillaws.Conn) {
 	p.SetWebsocketConnectionAndSendBoardState(ctx, ws, game.board.PGN(), game.board.colorToMove)
 }
--- a/chess/king.go
+++ b/chess/king.go
@ -29,25 +29,26 @@ func (k King) AfterMoveAction(board *Board, fromSquare types.Coordinate) {
 	}
 }

-func (k King) HandleCastling(board *Board, move types.Move) (bool, error) {
+func (k King) HandleCastling(board *Board, move types.Move) (bool, Violation) {
+	if !k.isMoveCastlingMove(board, move) {
+		return false, ""
+	}
+
 	if k.hadMovedBefore(board) {
-		return false, nil
+		return false, ""
 	}

-	valid, dir := k.movedOnValidCastlingSquare(board, move)
+	if board.isSquareAttacked(move.StartSquare, k.Color.Opposite()) {
+		return false, CastlingWhileKingInCheck
+	}
+
+	valid, dir := k.isCastlingAllowed(board, move)
 	if !valid {
-		return false, nil
-	}
-
-	switch k.Color {
-	case types.White:
-		board.state.WhiteKingMoved = true
-	case types.Black:
-		board.state.BlackKingMoved = true
+		return false, ""
 	}

 	k.playCastlingOnBoard(board, move, dir)
-	return true, nil
+	return true, ""
 }

 func (k King) hadMovedBefore(b *Board) bool {
@ -64,52 +65,95 @@ func (k King) hadMovedBefore(b *Board) bool {
 type CastlingDirection string

 const (
+	NoDirection   CastlingDirection = ""
 	CastlingRight CastlingDirection = "right"
 	CastlingLeft  CastlingDirection = "left"
 )

-func (k King) movedOnValidCastlingSquare(b *Board, move types.Move) (bool, CastlingDirection) {
+func (k King) isMoveCastlingMove(b *Board, move types.Move) bool {
+	var destinationSquareForKingRight types.Coordinate
+	var destinationSquareForKingLeft types.Coordinate
+
+	switch k.Color {
+	case types.White:
+		destinationSquareForKingRight = types.Coordinate{Col: 7, Row: 1}
+		destinationSquareForKingLeft = types.Coordinate{Col: 3, Row: 1}
+
+	case types.Black:
+		destinationSquareForKingRight = types.Coordinate{Col: 7, Row: 8}
+		destinationSquareForKingLeft = types.Coordinate{Col: 3, Row: 8}
+	}
+
+	if move.EndSquare == destinationSquareForKingRight ||
+		move.EndSquare == destinationSquareForKingLeft {
+		return true
+	}
+
+	return false
+}
+
+func (k King) isCastlingAllowed(b *Board, move types.Move) (bool, CastlingDirection) {
 	var valid = false

 	switch k.Color {
 	case types.White:
-		castlingSquareRight := types.Coordinate{Col: 7, Row: 1}
-		castlingSquareLeft := types.Coordinate{Col: 3, Row: 1}
+		destinationSquareForKingRight := types.Coordinate{Col: 7, Row: 1}
+		destinationSquareForKingLeft := types.Coordinate{Col: 3, Row: 1}

-		if move.EndSquare == castlingSquareRight &&
-			b.getPieceAt(castlingSquareRight) == nil &&
-			b.getPieceAt(*castlingSquareRight.Left(1)) == nil &&
+		if move.EndSquare == destinationSquareForKingRight &&
+			b.getPieceAt(destinationSquareForKingRight) == nil &&
+			b.getPieceAt(*destinationSquareForKingRight.Left(1)) == nil &&
+			!b.isSquareAttacked(destinationSquareForKingRight, types.Black) &&
+			!b.isSquareAttacked(*destinationSquareForKingRight.Left(1), types.Black) &&
 			!b.state.WhiteHRookMoved {
-			return true, CastlingRight
+			_, ok := b.getPieceAt(types.Coordinate{Col: 8, Row: 1}).(Rook)
+			if ok {
+				return true, CastlingRight
+			}
 		}

-		if move.EndSquare == castlingSquareLeft &&
-			b.getPieceAt(castlingSquareLeft) == nil &&
-			b.getPieceAt(*castlingSquareLeft.Right(1)) == nil &&
-			b.getPieceAt(*castlingSquareLeft.Left(1)) == nil &&
+		if move.EndSquare == destinationSquareForKingLeft &&
+			b.getPieceAt(destinationSquareForKingLeft) == nil &&
+			b.getPieceAt(*destinationSquareForKingLeft.Right(1)) == nil &&
+			b.getPieceAt(*destinationSquareForKingLeft.Left(1)) == nil &&
+			!b.isSquareAttacked(destinationSquareForKingLeft, types.Black) &&
+			!b.isSquareAttacked(*destinationSquareForKingLeft.Right(1), types.Black) &&
 			!b.state.WhiteARookMoved {
-			return true, CastlingLeft
+			_, ok := b.getPieceAt(types.Coordinate{Col: 1, Row: 1}).(Rook)
+			if ok {
+				return true, CastlingLeft
+			}
 		}
 	case types.Black:
-		castlingSquareRight := types.Coordinate{Col: 7, Row: 8}
-		castlingSquareLeft := types.Coordinate{Col: 3, Row: 8}
+		destinationSquareForKingRight := types.Coordinate{Col: 7, Row: 8}
+		destinationSquareForKingLeft := types.Coordinate{Col: 3, Row: 8}

-		if move.EndSquare == castlingSquareRight &&
-			b.getPieceAt(castlingSquareRight) == nil &&
-			b.getPieceAt(*castlingSquareRight.Left(1)) == nil &&
+		if move.EndSquare == destinationSquareForKingRight &&
+			b.getPieceAt(destinationSquareForKingRight) == nil &&
+			b.getPieceAt(*destinationSquareForKingRight.Left(1)) == nil &&
+			!b.isSquareAttacked(destinationSquareForKingRight, types.White) &&
+			!b.isSquareAttacked(*destinationSquareForKingRight.Left(1), types.White) &&
 			!b.state.BlackHRookMoved {
-			return true, CastlingRight
+			_, ok := b.getPieceAt(types.Coordinate{Col: 8, Row: 8}).(Rook)
+			if ok {
+				return true, CastlingRight
+			}
 		}

-		if move.EndSquare == castlingSquareLeft &&
-			b.getPieceAt(castlingSquareLeft) == nil &&
-			b.getPieceAt(*castlingSquareLeft.Right(1)) == nil &&
-			b.getPieceAt(*castlingSquareLeft.Left(1)) == nil &&
+		if move.EndSquare == destinationSquareForKingLeft &&
+			b.getPieceAt(destinationSquareForKingLeft) == nil &&
+			b.getPieceAt(*destinationSquareForKingLeft.Right(1)) == nil &&
+			b.getPieceAt(*destinationSquareForKingLeft.Left(1)) == nil &&
+			!b.isSquareAttacked(destinationSquareForKingLeft, types.White) &&
+			!b.isSquareAttacked(*destinationSquareForKingLeft.Right(1), types.White) &&
 			!b.state.BlackARookMoved {
-			return true, CastlingLeft
+			_, ok := b.getPieceAt(types.Coordinate{Col: 1, Row: 8}).(Rook)
+			if ok {
+				return true, CastlingLeft
+			}
 		}
 	}
-	return valid, CastlingRight
+	return valid, NoDirection
 }

 func (k King) playCastlingOnBoard(board *Board, move types.Move, dir CastlingDirection) {
--- a/chess/pawn.go
+++ b/chess/pawn.go
@ -32,7 +32,7 @@ func (p Pawn) GetColor() types.ChessColor {
 	return p.Color
 }

-func (p *Pawn) HandlePossiblePromotion(b *Board, move types.Move) (bool, error) {
+func (p *Pawn) HandlePossiblePromotion(b *Board, move types.Move) (bool, Violation) {
 	var isPromotionMove bool
 	var promotionToPiece types.PieceShortName

@ -62,14 +62,14 @@ func (p *Pawn) HandlePossiblePromotion(b *Board, move types.Move) (bool, error)
 		b.position[move.EndSquare] = GetPieceForShortName(promotionToPiece)
 	}

-	return isPromotionMove, nil
+	return isPromotionMove, ""
 }

-func (p *Pawn) HandleEnPassant(b *Board, move, lastMove types.Move) (bool, error) {
+func (p *Pawn) HandleEnPassant(b *Board, move, lastMove types.Move) (bool, Violation) {
 	var wasEnPassant bool

 	if lastMove.PieceMoved.ToCommon() != types.PawnShortName {
-		return false, nil
+		return false, ""
 	}

 	switch move.ColorMoved {
@ -127,7 +127,7 @@ func (p *Pawn) HandleEnPassant(b *Board, move, lastMove types.Move) (bool, error
 		b.position[move.EndSquare] = GetPieceForShortName(move.PieceMoved)
 	}

-	return wasEnPassant, nil
+	return wasEnPassant, ""
 }
 func (p Pawn) getAllMoves(fromSquare types.Coordinate) []types.Coordinate {
 	theoreticalMoves := make([]types.Coordinate, 0, 4)
--- a/chess/player.go
+++ b/chess/player.go
@ -10,7 +10,7 @@ import (
 	"mchess_server/types"

 	"github.com/google/uuid"
-	"nhooyr.io/websocket"
+	gorillaws "github.com/gorilla/websocket"
 )

 type Player struct {
@ -34,13 +34,13 @@ func (p Player) hasWebsocketConnection() bool {
 	return p.Conn.HasWebsocketConnection()
 }

-func (p *Player) SetWebsocketConnection(ctx context.Context, ws *websocket.Conn) {
+func (p *Player) SetWebsocketConnection(ctx context.Context, ws *gorillaws.Conn) {
 	p.Conn.SetWebsocketConnection(ws)
 }

 func (p *Player) SetWebsocketConnectionAndSendBoardState(
 	ctx context.Context,
-	ws *websocket.Conn,
+	ws *gorillaws.Conn,
 	boardPosition string,
 	turnColor types.ChessColor,
 ) {
--- a/chess/violation.go
+++ b/chess/violation.go
@ -3,12 +3,15 @@ package chess
 type Violation string

 var (
-	InvalidMove            Violation = "invalid move"
-	NoPieceAtStartSquare   Violation = "no piece at start square"
-	WrongColorMoved        Violation = "wrong color moved"
-	TargetSquareIsOccupied Violation = "target square is occupied"
-	KingInCheck            Violation = "king would be in check after move"
-	SomethingWentWrong     Violation = "something went wrong"
+	InvalidMove              Violation = "invalid move"
+	NoPieceAtStartSquare     Violation = "no piece at start square"
+	WrongColorMoved          Violation = "wrong color moved"
+	TargetSquareIsOccupied   Violation = "target square is occupied"
+	KingInCheck              Violation = "king would be in check after move"
+	SomethingWentWrong       Violation = "something went wrong"
+	CastlingThroughCheck     Violation = "king would move through check"
+	CastlingWhileKingInCheck Violation = "king cannot castle while in check"
+	CastlingKingMovedBefore  Violation = "king cannot caslte because he moved before"
 )

 func (v Violation) String() string {
--- a/connection/type.go
+++ b/connection/type.go
@ -3,13 +3,15 @@ package connection
 import (
 	"context"
 	"log"
+	"sync"

-	"nhooyr.io/websocket"
+	gorillaws "github.com/gorilla/websocket"
 )

 type Connection struct {
-	ws                      *websocket.Conn
+	ws                      *gorillaws.Conn
 	wsConnectionEstablished chan bool
+	wsWriteLock             sync.Mutex
 	ctx                     context.Context
 	buffer                  MessageBuffer
 	disconnectCallback      func()
@ -28,7 +30,7 @@ func NewConnection(options ...func(*Connection)) *Connection {
 	return &connection
 }

-func WithWebsocket(ws *websocket.Conn) func(*Connection) {
+func WithWebsocket(ws *gorillaws.Conn) func(*Connection) {
 	return func(c *Connection) {
 		c.ws = ws
 	}
@ -56,7 +58,7 @@ func (conn *Connection) HasWebsocketConnection() bool {
 	return conn.ws != nil
 }

-func (conn *Connection) SetWebsocketConnection(ws *websocket.Conn) {
+func (conn *Connection) SetWebsocketConnection(ws *gorillaws.Conn) {
 	if ws == nil {
 		return
 	}
@ -70,7 +72,7 @@ func (conn *Connection) SetWebsocketConnection(ws *websocket.Conn) {

 	go func() {
 		for {
-			_, msg, err := conn.ws.Read(conn.ctx)
+			_, msg, err := conn.ws.ReadMessage()
 			if err != nil {
 				log.Println("while reading from websocket: %w", err)
 				if conn.disconnectCallback != nil {
@ -84,12 +86,15 @@ func (conn *Connection) SetWebsocketConnection(ws *websocket.Conn) {
 }

 func (conn *Connection) Write(msg []byte) error {
+	conn.wsWriteLock.Lock()
+	defer conn.wsWriteLock.Unlock()
+
 	if conn.ws == nil { //if ws is not yet set, we wait for it
 		<-conn.wsConnectionEstablished
 	}

 	log.Printf("Writing message: %s", string(msg))
-	return conn.ws.Write(conn.ctx, websocket.MessageText, msg)
+	return conn.ws.WriteMessage(gorillaws.TextMessage, msg)
 }

 func (conn *Connection) Read() ([]byte, error) {
@ -103,6 +108,7 @@ func (conn *Connection) Read() ([]byte, error) {
 }

 func (conn *Connection) Close(msg string) {
-	conn.ws.Close(websocket.StatusCode(400), msg)
+	conn.ws.WriteMessage(gorillaws.TextMessage, []byte(msg))
+	conn.ws.Close()
 	conn.ws = nil
 }
--- a/go.mod
+++ b/go.mod
@ -1,46 +1,46 @@
 module mchess_server

-go 1.21.1
+go 1.22

 require (
-	github.com/gin-gonic/gin v1.9.1
-	github.com/google/uuid v1.5.0
+	github.com/gin-gonic/gin v1.10.0
+	github.com/google/uuid v1.6.0
 	github.com/samber/lo v1.39.0
-	github.com/stretchr/testify v1.8.4
-	github.com/tjarratt/babble v0.0.0-20210505082055-cbca2a4833c1
-	nhooyr.io/websocket v1.8.10
+	github.com/stretchr/testify v1.9.0
 )

+require github.com/benbjohnson/clock v1.3.0 // indirect
+
 require (
-	github.com/bytedance/sonic v1.10.2 // indirect
-	github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d // indirect
-	github.com/chenzhuoyu/iasm v0.9.1 // indirect
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-playground/validator/v10 v10.16.0 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
-	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/gorilla/websocket v1.5.1
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
-	github.com/leodido/go-urn v1.2.4 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
-	github.com/onsi/ginkgo v1.16.5 // indirect
-	github.com/onsi/gomega v1.27.10 // indirect
-	github.com/pelletier/go-toml/v2 v2.1.1 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.12 // indirect
-	golang.org/x/arch v0.6.0 // indirect
-	golang.org/x/crypto v0.17.0 // indirect
-	golang.org/x/exp v0.0.0-20231226003508-02704c960a9b // indirect
-	golang.org/x/net v0.19.0 // indirect
-	golang.org/x/sys v0.15.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
-	google.golang.org/protobuf v1.32.0 // indirect
+	go.uber.org/ratelimit v0.3.1
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,65 +1,47 @@
-github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
-github.com/bytedance/sonic v1.10.0-rc/go.mod h1:ElCzW+ufi8qKqNW0FY314xriJhyJhuoJ3gFZdAHF7NM=
-github.com/bytedance/sonic v1.10.2 h1:GQebETVBxYB7JGWJtLBi07OVzWwt+8dWA00gEVW2ZFE=
-github.com/bytedance/sonic v1.10.2/go.mod h1:iZcSUejdk5aukTND/Eu/ivjQuEL0Cu9/rf50Hi0u/g4=
-github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
-github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
-github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d h1:77cEq6EriyTZ0g/qfRdp61a3Uu/AWrgIq2s0ClJV1g0=
-github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d/go.mod h1:8EPpVsBuRksnlj1mLy4AWzRNQYxauNi62uWcE3to6eA=
-github.com/chenzhuoyu/iasm v0.9.0/go.mod h1:Xjy2NpN3h7aUqeqM+woSuuvxmIe6+DDsiNLIrkAmYog=
-github.com/chenzhuoyu/iasm v0.9.1 h1:tUHQJXo3NhBqw6s33wkGn9SP3bvrWLdlVIJ3hQBL7P0=
-github.com/chenzhuoyu/iasm v0.9.1/go.mod h1:Xjy2NpN3h7aUqeqM+woSuuvxmIe6+DDsiNLIrkAmYog=
+github.com/benbjohnson/clock v1.3.0 h1:ip6w0uFQkncKQ979AypyG0ER7mqUSBdKLOgAle/AT8A=
+github.com/benbjohnson/clock v1.3.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
+github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
+github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
+github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
+github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
+github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQPiEFhY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
-github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
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 nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
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--- a/lobby_registry/lobby.go
+++ b/lobby_registry/lobby.go
@ -1,4 +1,4 @@
-package lobby_registry
+package lobbies

 import (
 	"mchess_server/chess"
--- a/lobby_registry/registry.go
+++ b/lobby_registry/registry.go
@ -1,4 +1,4 @@
-package lobby_registry
+package lobbies

 import (
 	"mchess_server/utils"
--- a/lobbies/usher.go
+++ b/lobbies/usher.go
@ -0,0 +1,50 @@
+package lobbies
+
+import (
+	"mchess_server/chess"
+	"mchess_server/utils"
+
+	"github.com/google/uuid"
+)
+
+type Usher struct {
+}
+
+var usherInstance *Usher
+
+func newUsher() *Usher {
+	return &Usher{}
+}
+
+func GetUsher() *Usher {
+	if usherInstance == nil {
+		usherInstance = newUsher()
+	}
+	return usherInstance
+}
+
+func (u *Usher) WelcomeNewPlayer(player *chess.Player) *Lobby {
+	lobby := GetLobbyRegistry().GetLobbyForPlayer()
+	return lobby
+}
+
+func (u *Usher) CreateNewPrivateLobby(player *chess.Player) *Lobby {
+	lobby := GetLobbyRegistry().CreateNewPrivateLobby()
+	return lobby
+}
+
+func (u *Usher) FindExistingPrivateLobby(p utils.Passphrase) *Lobby {
+	lobby := GetLobbyRegistry().GetLobbyByPassphrase(p)
+	if lobby == nil || lobby.IsFull() {
+		return nil
+	}
+	return lobby
+}
+
+func (*Usher) GetLobbyByID(id uuid.UUID) *Lobby {
+	return GetLobbyRegistry().GetLobbyByUUID(id)
+}
+
+func (u *Usher) AddPlayerToLobbyAndStartGameIfFull(player *chess.Player, lobby *Lobby) {
+	lobby.AddPlayerAndStartGameIfFull(player)
+}
--- a/main.go
+++ b/main.go
@ -1,28 +1,16 @@
 package main

 import (
-	"context"
-	"encoding/json"
 	"flag"
-	"fmt"
 	"log"
-	"mchess_server/api"
-	"mchess_server/chess"
-	lobbies "mchess_server/lobby_registry"
-	"mchess_server/usher"
-	"mchess_server/utils"
-	"net/http"
-	"sync"
+	"mchess_server/api/handler"

 	"github.com/gin-gonic/gin"
-	"github.com/google/uuid"
-	"nhooyr.io/websocket"
 )

 var cert_path = "/etc/letsencrypt/live/chess.sw-gross.de/"
 var cert_file = cert_path + "fullchain.pem"
 var key_file = cert_path + "privkey.pem"
-var mut sync.Mutex

 func main() {
 	var debugMode bool
@ -35,10 +23,13 @@ func main() {
 	}

 	router := gin.Default()
-	router.GET("/api/random", registerForRandomGame)
-	router.GET("/api/hostPrivate", hostPrivateGame)
-	router.POST("/api/joinPrivate", joinPrivateGame)
-	router.GET("/api/ws", registerWebSocketConnection)
+	router.GET("/api/hostPrivate", handler.HostGameHandler)
+	router.POST("/api/joinPrivate", handler.JoinPrivateGame)
+	router.GET("/api/ws", handler.RegisterWebSocketConnection)
+
+	router.GET("/api/getLobbyForPassphrase/:phrase", handler.GetLobbyForPassphraseHandler)
+	router.GET("/api/registerWsForGame/:id", handler.ConnectWsForGame)
+	router.POST("/api/joinGame/:id", handler.JoinGameHandler)

 	if debugMode {
 		log.Println("Starting service WITHOUT TLS")
@ -50,139 +41,3 @@ func main() {
 		log.Fatal(router.RunTLS("chess.sw-gross.de:9999", cert_file, key_file))
 	}
 }
-
-func registerForRandomGame(c *gin.Context) {
-	player := chess.NewPlayer(uuid.New())
-	usher := usher.GetUsher()
-
-	mut.Lock()
-	defer mut.Unlock()
-	lobby := usher.WelcomeNewPlayer(player)
-	usher.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
-
-	info := api.PlayerInfo{
-		PlayerID: &player.Uuid,
-		LobbyID:  &lobby.Uuid,
-	}
-	log.Println("responding with info ", info)
-
-	c.Header("Access-Control-Allow-Origin", "*")
-	c.IndentedJSON(http.StatusOK, info)
-}
-
-func hostPrivateGame(c *gin.Context) {
-	player := chess.NewPlayer(uuid.New())
-	u := usher.GetUsher()
-
-	mut.Lock()
-	defer mut.Unlock()
-	lobby := u.CreateNewPrivateLobby(player)
-	u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
-
-	passphrase := lobby.Passphrase.String()
-	info := api.PlayerInfo{
-		PlayerID:   &player.Uuid,
-		LobbyID:    &lobby.Uuid,
-		Passphrase: &passphrase,
-	}
-	c.Header("Access-Control-Allow-Origin", "*")
-	c.IndentedJSON(http.StatusOK, info)
-}
-
-func joinPrivateGame(c *gin.Context) {
-	req := api.PlayerInfo{}
-	log.Println(c.Request.Body)
-	err := c.ShouldBindJSON(&req)
-	if err != nil || req.Passphrase == nil || *req.Passphrase == "" {
-		c.IndentedJSON(http.StatusNotFound, req)
-	}
-
-	u := usher.GetUsher()
-
-	if req.Passphrase != nil &&
-		*req.Passphrase != "" &&
-		req.PlayerID != nil &&
-		req.LobbyID != nil { //is reconnect
-		lobby := u.FindExistingPrivateLobby(utils.Passphrase(*req.Passphrase))
-		_, found := lobby.GetPlayerByUUID(*req.PlayerID)
-		if found {
-			c.IndentedJSON(
-				http.StatusOK,
-				api.PlayerInfo{
-					PlayerID:   req.PlayerID,
-					LobbyID:    req.LobbyID,
-					Passphrase: req.Passphrase,
-				})
-			return
-		} else {
-			c.IndentedJSON(http.StatusNotFound, req)
-		}
-	}
-
-	player := chess.NewPlayer(uuid.New())
-
-	mut.Lock()
-	defer mut.Unlock()
-	lobby := u.FindExistingPrivateLobby(utils.Passphrase(*req.Passphrase))
-	if lobby != nil {
-		u.AddPlayerToLobbyAndStartGameIfFull(player, lobby)
-	} else {
-		c.IndentedJSON(http.StatusNotFound, req)
-		return
-	}
-
-	info := api.PlayerInfo{
-		PlayerID:   &player.Uuid,
-		LobbyID:    &lobby.Uuid,
-		Passphrase: req.Passphrase,
-	}
-	c.Header("Access-Control-Allow-Origin", "*")
-	c.IndentedJSON(http.StatusOK, info)
-}
-
-func registerWebSocketConnection(c *gin.Context) {
-	webSocketConn, err := websocket.Accept(c.Writer, c.Request, &websocket.AcceptOptions{OriginPatterns: []string{"chess.sw-gross.de", "localhost:*"}})
-	if err != nil {
-		log.Println(err)
-		return
-	}
-	go waitForAndHandlePlayerID(c, webSocketConn)
-}
-
-func waitForAndHandlePlayerID(ctx context.Context, conn *websocket.Conn) {
-	msgType, msg, err := conn.Read(ctx)
-	if err != nil {
-		errorMessage := fmt.Sprintf("Reading from websocket connection did not work: %s", err)
-		log.Println(errorMessage)
-		conn.Close(websocket.StatusCode(400), errorMessage)
-		return
-	}
-
-	log.Println("read from websocket endpoint: ", msgType, string(msg), err)
-
-	var info api.PlayerInfo
-	err = json.Unmarshal(msg, &info)
-	if err != nil {
-		errorMessage := fmt.Sprintf("Unmarshaling message did not work: %s", err)
-		log.Println(errorMessage)
-		conn.Close(websocket.StatusCode(400), errorMessage)
-		return
-	}
-
-	lobby := lobbies.GetLobbyRegistry().GetLobbyByUUID(*info.LobbyID)
-	if lobby == nil {
-		conn.Close(websocket.StatusCode(400), "lobby not found")
-		return
-	}
-
-	player, found := lobby.GetPlayerByUUID(*info.PlayerID)
-	if !found {
-		conn.Close(websocket.StatusCode(400), "player not found")
-		return
-	}
-	if player.Conn.HasWebsocketConnection() {
-		player.Conn.Close("closing existing connection")
-	}
-	lobby.Game.SetWebsocketConnectionFor(ctx, player, conn)
-	log.Println("player after setting connection: ", player)
-}
--- a/usher/usher.go
+++ b/usher/usher.go
@ -1,45 +0,0 @@
-package usher
-
-import (
-	"mchess_server/chess"
-	lobbies "mchess_server/lobby_registry"
-	"mchess_server/utils"
-)
-
-type Usher struct {
-}
-
-var instance *Usher
-
-func newUsher() *Usher {
-	return &Usher{}
-}
-
-func GetUsher() *Usher {
-	if instance == nil {
-		instance = newUsher()
-	}
-	return instance
-}
-
-func (u *Usher) WelcomeNewPlayer(player *chess.Player) *lobbies.Lobby {
-	lobby := lobbies.GetLobbyRegistry().GetLobbyForPlayer()
-	return lobby
-}
-
-func (u *Usher) CreateNewPrivateLobby(player *chess.Player) *lobbies.Lobby {
-	lobby := lobbies.GetLobbyRegistry().CreateNewPrivateLobby()
-	return lobby
-}
-
-func (u *Usher) FindExistingPrivateLobby(p utils.Passphrase) *lobbies.Lobby {
-	lobby := lobbies.GetLobbyRegistry().GetLobbyByPassphrase(p)
-	if lobby == nil || lobby.IsFull() {
-		return nil
-	}
-	return lobby
-}
-
-func (u *Usher) AddPlayerToLobbyAndStartGameIfFull(player *chess.Player, lobby *lobbies.Lobby) {
-	lobby.AddPlayerAndStartGameIfFull(player)
-}
--- a/utils/clean-words.go
+++ b/utils/clean-words.go
--- a/utils/passphrase.go
+++ b/utils/passphrase.go
@ -2,101 +2,56 @@ package utils

 import (
 	"strings"
-
-	"github.com/tjarratt/babble"
+	"unicode"
 )

 type Passphrase string

 func NewPassphrase() Passphrase {
 	var phrase string
-	var retries int
 	var word string
-	var words = 2
+	var words = 3
+
 	//TODO make sure passphrases are unique
 	for words > 0 {
-		retries = 20
-		for {
-			word = getCleanWord()
-			if isAccecpable(word) {
-				phrase = phrase + word + " "
-				break
-			}
-			if retries == 1 { //this is our last try, we take any word
-				phrase = phrase + word + " "
-			}
-			retries -= 1
-		}
+		word = getCleanWord()
+		phrase = phrase + word + " "
 		words -= 1
 	}
 	return Passphrase(strings.TrimSpace(phrase))
 }

+func NewPassphraseFromString(s string) Passphrase {
+	return Passphrase(s)
+}
+
+func (p Passphrase) AsURLParam() string {
+	var result string
+	phraseAsString := p.String()
+
+	segments := strings.Split(phraseAsString, " ")
+
+	for _, segment := range segments {
+		runes := []rune(segment)
+		runes[0] = unicode.ToUpper(runes[0])
+		result += string(runes)
+	}
+
+	return result
+}
+
+func ConvertToPassphraseWithSpaces(s string) Passphrase {
+	result := ""
+	for _, rune := range s {
+		if unicode.IsUpper(rune) {
+			result += " "
+		}
+		result += strings.ToLower(string(rune))
+	}
+
+	return NewPassphraseFromString(strings.Trim(result, " "))
+}
+
 func (p Passphrase) String() string {
 	return string(p)
 }
-
-func isAccecpable(s string) bool {
-	l := len(s)
-	if l > 8 || l < 3 {
-		return false
-	}
-
-	for _, rune := range s {
-		if !isEnglishLetter(rune) {
-			return false
-		}
-	}
-	return true
-}
-
-func isProfanity(s string) bool {
-	contains := []string{
-		"nigg",
-		"fag",
-		"ass",
-		"bitch",
-		"rape",
-		"ass",
-		"scrot",
-		"rect",
-	}
-	startsWith := []string{
-		"spic",
-		"chin",
-		"cunt",
-	}
-
-	for _, word := range contains {
-		if strings.Contains(s, word) {
-			return true
-		}
-	}
-	for _, word := range startsWith {
-		if strings.HasPrefix(s, word) {
-			return true
-		}
-	}
-	return false
-}
-
-func isEnglishLetter(r rune) bool {
-	if (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') {
-		return false
-	}
-	return true
-}
-
-func getCleanWord() string {
-	var word string
-
-	babbler := babble.NewBabbler()
-	babbler.Count = 1
-
-	for {
-		word = babbler.Babble()
-		if !isProfanity(word) {
-			return word
-		}
-	}
-}
--- a/utils/passphrase_test.go
+++ b/utils/passphrase_test.go
@ -0,0 +1,36 @@
+package utils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_onlyUniqueWords(t *testing.T) {
+	wordsDistribution := make(map[string]int)
+
+	for _, word := range CleanWords {
+		wordsDistribution[word] += 1
+	}
+
+	for _, v := range wordsDistribution {
+		assert.Equal(t, 1, v)
+	}
+
+	assert.Equal(t, numberOfCleanWords, len(wordsDistribution))
+}
+
+func Test_Passphrase_AsURLParam(t *testing.T) {
+	phrase := NewPassphraseFromString("this is a Test phrase")
+
+	asParams := phrase.AsURLParam()
+
+	assert.Equal(t, "ThisIsATestPhrase", asParams)
+}
+
+func Test_Passphrase_ConvertToPassphraseWithSpaces(t *testing.T) {
+	fromURL := "ThisIsATestPhraseWithManyWords"
+	phrase := ConvertToPassphraseWithSpaces(fromURL)
+
+	assert.Equal(t, NewPassphraseFromString("this is a test phrase with many words"), phrase)
+}
Author	SHA1	Message	Date
marco	0f71743598	Merge pull request 'Some more changes for the new game handling api and also rate limiting' (#13 ) from game-handler into master Reviewed-on: #13	2024-05-12 13:48:22 +00:00
Marco	97ad45e505	Rate limit websocket connection	2024-05-12 15:42:40 +02:00
Marco	4207a0ed72	forgot files	2024-05-12 15:37:53 +02:00
Marco	fc088a04fe	More work for introducing a new game handler, also: ratelimiter	2024-05-12 15:36:30 +02:00
Marco	58002a1b38	Groundwork for handler that allows reconnecting	2024-05-11 22:57:47 +02:00
marco	829a80d62a	Merge pull request 'Replace old websocket library with gorilla's one' (#12 ) from introduce-gorilla-ws into master Reviewed-on: #12	2024-05-11 17:17:50 +00:00
Marco	42dc4e5af8	go mod tidy	2024-05-11 12:05:41 +02:00
Marco	65dc2ebd24	Replace old websocket library with the gorilla one	2024-05-11 12:03:24 +02:00
Marco	d40c757776	fix bug that prevented king from moving because server thought it wanted to castling (but it was not a castling move)	2024-05-10 02:29:11 +02:00
marco	a55a46e866	Merge pull request 'get-lobby-from-passphrase' (#11 ) from get-lobby-from-passphrase into master Reviewed-on: #11	2024-05-09 20:49:24 +00:00
Marco	d7c4f28f3a	Fix endpoint for getting lobby id from passphrase Had to add several helpers (e.g. passphrase ones) to make the endpoint for getting lobby id work. Moved all handler functions into handler package. Added test for getting lobby from passphrase.	2024-05-09 22:29:48 +02:00
Marco	11d6e8c98a	Introduce handler to get lobby info from passphrase	2024-05-07 23:39:05 +02:00
Marco	b2ebf2cc5d	Remove more words and remove duplicates	2024-05-02 12:47:18 +02:00
Marco	3b77a01dad	go get -u	2024-05-01 01:15:32 +02:00
marco	d50c4908c8	Merge pull request 'We introduce a pre-filtered list of (hopefully) clean words. Generating the passphrase with babbler was too slow' (#10 ) from clean-words into master Reviewed-on: #10	2024-04-30 23:13:34 +00:00
Marco	d7731c08eb	We introduce a pre-filtered list of (hopefully) clean words. Generating the passphrase with babbler was too slow	2024-04-30 23:55:27 +02:00
Marco	db754f5601	Do not remove a disconnected player from the 'player' slice since that crashes the server	2024-04-23 19:29:32 +02:00
marco	732d759f84	Merge pull request 'Prevent castling in case there is no rook on the castling side' (#8 ) from fix-castling-without-rook into master Reviewed-on: #8	2024-04-16 16:20:33 +00:00
Marco	25893a5187	Prevent castling in case there is no rook on the castling side	2024-04-16 18:17:28 +02:00
marco	4153f4cc7c	Merge pull request 'Fix a bug that allowed castling even if squares were attacked' (#3 ) from castling-through-check into master Reviewed-on: #3	2024-04-09 19:55:40 +00:00
Marco	77e66aabdd	Fix a bug that allowed castling even if squares were attacked	2024-04-09 21:48:27 +02:00
Marco	24a4f19d28	Run go get -u	2024-02-18 19:18:46 +01:00
marco	0190ff99d4	Merge pull request 'checkmate-and-stalemate-check' (#2 ) from checkmate-and-stalemate-check into master Reviewed-on: #2	2024-01-17 23:07:14 +01:00