Major refactor of API

api/account.go

@@ -5,9 +5,7 @@ import (
 	"crypto/rand"
 	"database/sql"
 	"encoding/base64"
-	"encoding/json"
 	"fmt"
-	"net/http"
 	"os"
 	"regexp"
 	"strconv"
@@ -34,19 +32,7 @@ type AccountInfoResponse struct {
 }
 
 // /account/info - get account info
-func (s *Server) handleAccountInfo(w http.ResponseWriter, r *http.Request) {
+func handleAccountInfo(username string, uuid []byte) (AccountInfoResponse, error) {
-	username, err := getUsernameFromRequest(r)
-	if err != nil {
-		httpError(w, r, err.Error(), http.StatusBadRequest)
-		return
-	}
-
-	uuid, err := getUUIDFromRequest(r) // lazy
-	if err != nil {
-		httpError(w, r, err.Error(), http.StatusBadRequest)
-		return
-	}
-
 	var latestSave time.Time
 	latestSaveID := -1
 	for id := range sessionSlotCount {
@@ -66,142 +52,95 @@ func (s *Server) handleAccountInfo(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	response, err := json.Marshal(AccountInfoResponse{Username: username, LastSessionSlot: latestSaveID})
+	return AccountInfoResponse{Username: username, LastSessionSlot: latestSaveID}, nil
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to marshal response json: %s", err), http.StatusInternalServerError)
-		return
-	}
-
-	w.Write(response)
 }
 
 type AccountRegisterRequest GenericAuthRequest
 
 // /account/register - register account
-func (s *Server) handleAccountRegister(w http.ResponseWriter, r *http.Request) {
+func handleAccountRegister(username, password string) error {
-	var request AccountRegisterRequest
+	if !isValidUsername(username) {
-	err := json.NewDecoder(r.Body).Decode(&request)
+		return fmt.Errorf("invalid username")
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to decode request body: %s", err), http.StatusBadRequest)
-		return
 	}
 
-	if !isValidUsername(request.Username) {
+	if len(password) < 6 {
-		httpError(w, r, "invalid username", http.StatusBadRequest)
+		return fmt.Errorf("invalid password")
-		return
-	}
-
-	if len(request.Password) < 6 {
-		httpError(w, r, "invalid password", http.StatusBadRequest)
-		return
 	}
 
 	uuid := make([]byte, UUIDSize)
-	_, err = rand.Read(uuid)
+	_, err := rand.Read(uuid)
 	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to generate uuid: %s", err), http.StatusInternalServerError)
+		return fmt.Errorf("failed to generate uuid: %s", err)
-		return
 	}
 
 	salt := make([]byte, ArgonSaltSize)
 	_, err = rand.Read(salt)
 	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to generate salt: %s", err), http.StatusInternalServerError)
+		return fmt.Errorf(fmt.Sprintf("failed to generate salt: %s", err))
-		return
 	}
 
-	err = db.AddAccountRecord(uuid, request.Username, argon2.IDKey([]byte(request.Password), salt, ArgonTime, ArgonMemory, ArgonThreads, ArgonKeySize), salt)
+	err = db.AddAccountRecord(uuid, username, argon2.IDKey([]byte(password), salt, ArgonTime, ArgonMemory, ArgonThreads, ArgonKeySize), salt)
 	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to add account record: %s", err), http.StatusInternalServerError)
+		return fmt.Errorf("failed to add account record: %s", err)
-		return
 	}
 
-	w.WriteHeader(http.StatusOK)
+	return nil
 }
 
 type AccountLoginRequest GenericAuthRequest
 type AccountLoginResponse GenericAuthResponse
 
 // /account/login - log into account
-func (s *Server) handleAccountLogin(w http.ResponseWriter, r *http.Request) {
+func handleAccountLogin(username, password string) (AccountLoginResponse, error) {
-	var request AccountLoginRequest
+	if !isValidUsername(username) {
-	err := json.NewDecoder(r.Body).Decode(&request)
+		return AccountLoginResponse{}, fmt.Errorf("invalid username")
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to decode request body: %s", err), http.StatusBadRequest)
-		return
 	}
 
-	if !isValidUsername(request.Username) {
+	if len(password) < 6 {
-		httpError(w, r, "invalid username", http.StatusBadRequest)
+		return AccountLoginResponse{}, fmt.Errorf("invalid password")
-		return
 	}
 
-	if len(request.Password) < 6 {
+	key, salt, err := db.FetchAccountKeySaltFromUsername(username)
-		httpError(w, r, "invalid password", http.StatusBadRequest)
-		return
-	}
-
-	key, salt, err := db.FetchAccountKeySaltFromUsername(request.Username)
 	if err != nil {
 		if err == sql.ErrNoRows {
-			httpError(w, r, "account doesn't exist", http.StatusBadRequest)
+			return AccountLoginResponse{}, fmt.Errorf("account doesn't exist")
-			return
 		}
 
-		httpError(w, r, err.Error(), http.StatusInternalServerError)
+		return AccountLoginResponse{}, err
-		return
 	}
 
-	if !bytes.Equal(key, argon2.IDKey([]byte(request.Password), salt, ArgonTime, ArgonMemory, ArgonThreads, ArgonKeySize)) {
+	if !bytes.Equal(key, argon2.IDKey([]byte(password), salt, ArgonTime, ArgonMemory, ArgonThreads, ArgonKeySize)) {
-		httpError(w, r, "password doesn't match", http.StatusBadRequest)
+		return AccountLoginResponse{}, fmt.Errorf("password doesn't match")
-		return
 	}
 
 	token := make([]byte, 32)
 	_, err = rand.Read(token)
 	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to generate token: %s", err), http.StatusInternalServerError)
+		return AccountLoginResponse{}, fmt.Errorf("failed to generate token: %s", err)
-		return
 	}
 
-	err = db.AddAccountSession(request.Username, token)
+	err = db.AddAccountSession(username, token)
 	if err != nil {
-		httpError(w, r, "failed to add account session", http.StatusInternalServerError)
+		return AccountLoginResponse{}, fmt.Errorf("failed to add account session")
-		return
 	}
 
-	response, err := json.Marshal(AccountLoginResponse{Token: base64.StdEncoding.EncodeToString(token)})
+	return AccountLoginResponse{Token: base64.StdEncoding.EncodeToString(token)}, nil
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to marshal response json: %s", err), http.StatusInternalServerError)
-		return
-	}
-
-	w.Write(response)
 }
 
 // /account/logout - log out of account
-func (s *Server) handleAccountLogout(w http.ResponseWriter, r *http.Request) {
+func handleAccountLogout(token []byte) error {
-	token, err := base64.StdEncoding.DecodeString(r.Header.Get("Authorization"))
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to decode token: %s", err), http.StatusBadRequest)
-		return
-	}
-
 	if len(token) != 32 {
-		httpError(w, r, "invalid token", http.StatusBadRequest)
+		return fmt.Errorf("invalid token")
-		return
 	}
 
-	err = db.RemoveSessionFromToken(token)
+	err := db.RemoveSessionFromToken(token)
 	if err != nil {
 		if err == sql.ErrNoRows {
-			httpError(w, r, "token not found", http.StatusBadRequest)
+			return fmt.Errorf("token not found")
-			return
 		}
 
-		httpError(w, r, "failed to remove account session", http.StatusInternalServerError)
+		return fmt.Errorf("failed to remove account session")
-		return
 	}
 
-	w.WriteHeader(http.StatusOK)
+	return nil
 }

api/daily.go

@@ -5,15 +5,13 @@ import (
 	"crypto/rand"
 	"encoding/base64"
 	"encoding/binary"
-	"encoding/json"
 	"fmt"
 	"log"
-	"net/http"
 	"os"
-	"strconv"
 	"time"
 
 	"github.com/Flashfyre/pokerogue-server/db"
+	"github.com/Flashfyre/pokerogue-server/defs"
 	"github.com/go-co-op/gocron"
 )
 
@@ -81,79 +79,27 @@ func deriveDailyRunSeed(seedTime time.Time) []byte {
 	return hashedSeed[:]
 }
 
-// /daily/seed - fetch daily run seed
-func (s *Server) handleSeed(w http.ResponseWriter) {
-	w.Write([]byte(dailyRunSeed))
-}
-
 // /daily/rankings - fetch daily rankings
-func (s *Server) handleRankings(w http.ResponseWriter, r *http.Request) {
+func handleRankings(uuid []byte, category, page int) ([]defs.DailyRanking, error) {
-	uuid, err := getUUIDFromRequest(r)
+	err := db.UpdateAccountLastActivity(uuid)
-	if err != nil {
-		httpError(w, r, err.Error(), http.StatusBadRequest)
-		return
-	}
-
-	err = db.UpdateAccountLastActivity(uuid)
 	if err != nil {
 		log.Print("failed to update account last activity")
 	}
 
-	var category int
-	if r.URL.Query().Has("category") {
-		category, err = strconv.Atoi(r.URL.Query().Get("category"))
-		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to convert category: %s", err), http.StatusBadRequest)
-			return
-		}
-	}
-
-	page := 1
-	if r.URL.Query().Has("page") {
-		page, err = strconv.Atoi(r.URL.Query().Get("page"))
-		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to convert page: %s", err), http.StatusBadRequest)
-			return
-		}
-	}
-
 	rankings, err := db.FetchRankings(category, page)
 	if err != nil {
 		log.Print("failed to retrieve rankings")
 	}
 
-	response, err := json.Marshal(rankings)
+	return rankings, nil
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to marshal response json: %s", err), http.StatusInternalServerError)
-		return
-	}
-
-	w.Write(response)
 }
 
 // /daily/rankingpagecount - fetch daily ranking page count
-func (s *Server) handleRankingPageCount(w http.ResponseWriter, r *http.Request) {
+func handleRankingPageCount(category int) (int, error) {
-	var err error
-	var category int
-
-	if r.URL.Query().Has("category") {
-		category, err = strconv.Atoi(r.URL.Query().Get("category"))
-		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to convert category: %s", err), http.StatusBadRequest)
-			return
-		}
-	}
-
 	pageCount, err := db.FetchRankingPageCount(category)
 	if err != nil {
 		log.Print("failed to retrieve ranking page count")
 	}
 
-	response, err := json.Marshal(pageCount)
+	return pageCount, nil
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to marshal response json: %s", err), http.StatusInternalServerError)
-		return
-	}
-
-	w.Write(response)
 }

api/error.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 )
 
-func httpError(w http.ResponseWriter, r *http.Request, error string, code int) {
+func httpError(w http.ResponseWriter, r *http.Request, err error, code int) {
-	log.Printf("%s: %s\n", r.URL.Path, error)
+	log.Printf("%s: %s\n", r.URL.Path, err)
-	http.Error(w, error, code)
+	http.Error(w, err.Error(), code)
 }

api/game.go

@@ -1,14 +1,10 @@
 package api
 
 import (
-	"encoding/json"
-	"fmt"
 	"log"
-	"net/http"
 	"time"
 
 	"github.com/Flashfyre/pokerogue-server/db"
-	"github.com/Flashfyre/pokerogue-server/defs"
 	"github.com/go-co-op/gocron"
 )
 
@@ -30,49 +26,14 @@ func updateStats() {
 	if err != nil {
 		log.Print(err)
 	}
+
 	battleCount, err = db.FetchBattleCount()
 	if err != nil {
 		log.Print(err)
 	}
+
 	classicSessionCount, err = db.FetchClassicSessionCount()
 	if err != nil {
 		log.Print(err)
 	}
 }
-
-// /game/playercount - get player count
-func (s *Server) handlePlayerCountGet(w http.ResponseWriter, r *http.Request) {
-	response, err := json.Marshal(playerCount)
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to marshal response json: %s", err), http.StatusInternalServerError)
-		return
-	}
-
-	w.Write(response)
-}
-
-// /game/titlestats - get title stats
-func (s *Server) handleTitleStatsGet(w http.ResponseWriter, r *http.Request) {
-	titleStats := &defs.TitleStats{
-		PlayerCount: playerCount,
-		BattleCount: battleCount,
-	}
-	response, err := json.Marshal(titleStats)
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to marshal response json: %s", err), http.StatusInternalServerError)
-		return
-	}
-
-	w.Write(response)
-}
-
-// /game/classicsessioncount - get classic session count
-func (s *Server) handleClassicSessionCountGet(w http.ResponseWriter, r *http.Request) {
-	response, err := json.Marshal(classicSessionCount)
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to marshal response json: %s", err), http.StatusInternalServerError)
-		return
-	}
-
-	w.Write(response)
-}

api/generic.go

@@ -1,14 +1,26 @@
 package api
 
 import (
+	"encoding/base64"
 	"encoding/gob"
+	"encoding/json"
+	"fmt"
 	"net/http"
+	"strconv"
+
+	"github.com/Flashfyre/pokerogue-server/defs"
 )
 
 type Server struct {
 	Debug bool
 }
 
+/*
+	The caller of endpoint handler functions are responsible for extracting the necessary data from the request.
+	Handler functions are responsible for checking the validity of this data and returning a result or error.
+	Handlers should not return serialized JSON, instead return the struct itself.
+*/
+
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	gob.Register([]interface{}{})
 	gob.Register(map[string]interface{}{})
@@ -25,37 +37,238 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 
 	switch r.URL.Path {
+	// /account
 	case "/account/info":
-		s.handleAccountInfo(w, r)
+		username, err := getUsernameFromRequest(r)
+		if err != nil {
+			httpError(w, r, err, http.StatusBadRequest)
+			return
+		}
+
+		uuid, err := getUUIDFromRequest(r) // lazy
+		if err != nil {
+			httpError(w, r, err, http.StatusBadRequest)
+			return
+		}
+
+		info, err := handleAccountInfo(username, uuid)
+		if err != nil {
+			httpError(w, r, err, http.StatusInternalServerError)
+			return
+		}
+
+		response, err := json.Marshal(info)
+		if err != nil {
+			httpError(w, r, fmt.Errorf("failed to marshal response json: %s", err), http.StatusInternalServerError)
+			return
+		}
+
+		w.Write(response)
 	case "/account/register":
-		s.handleAccountRegister(w, r)
+		var request AccountRegisterRequest
+		err := json.NewDecoder(r.Body).Decode(&request)
+		if err != nil {
+			httpError(w, r, fmt.Errorf("failed to decode request body: %s", err), http.StatusBadRequest)
+			return
+		}
+
+		err = handleAccountRegister(request.Username, request.Password)
+		if err != nil {
+			httpError(w, r, err, http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
 	case "/account/login":
-		s.handleAccountLogin(w, r)
+		var request AccountLoginRequest
+		err := json.NewDecoder(r.Body).Decode(&request)
+		if err != nil {
+			httpError(w, r, fmt.Errorf("failed to decode request body: %s", err), http.StatusBadRequest)
+			return
+		}
+
+		token, err := handleAccountLogin(request.Username, request.Password)
+		if err != nil {
+			httpError(w, r, err, http.StatusInternalServerError)
+			return
+		}
+
+		response, err := json.Marshal(token)
+		if err != nil {
+			httpError(w, r, fmt.Errorf("failed to marshal response json: %s", err), http.StatusInternalServerError)
+			return
+		}
+
+		w.Write(response)
 	case "/account/logout":
-		s.handleAccountLogout(w, r)
+		token, err := base64.StdEncoding.DecodeString(r.Header.Get("Authorization"))
+		if err != nil {
+			httpError(w, r, fmt.Errorf("failed to decode token: %s", err), http.StatusBadRequest)
+			return
+		}
 
+		err = handleAccountLogout(token)
+		if err != nil {
+			httpError(w, r, err, http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
+
+		// /game
 	case "/game/playercount":
-		s.handlePlayerCountGet(w, r)
+		w.Write([]byte(strconv.Itoa(playerCount)))
 	case "/game/titlestats":
-		s.handleTitleStatsGet(w, r)
+		response, err := json.Marshal(&defs.TitleStats{
+			PlayerCount: playerCount,
+			BattleCount: battleCount,
+		})
+		if err != nil {
+			httpError(w, r, fmt.Errorf("failed to marshal response json: %s", err), http.StatusInternalServerError)
+			return
+		}
+
+		w.Write(response)
 	case "/game/classicsessioncount":
-		s.handleClassicSessionCountGet(w, r)
+		w.Write([]byte(strconv.Itoa(classicSessionCount)))
 
-	case "/savedata/get":
+		// /savedata
-		s.handleSavedataGet(w, r)
+	case "/savedata/get", "/savedata/update", "/savedata/delete", "/savedata/clear":
-	case "/savedata/update":
+		uuid, err := getUUIDFromRequest(r)
-		s.handleSavedataUpdate(w, r)
+		if err != nil {
-	case "/savedata/delete":
+			httpError(w, r, err, http.StatusBadRequest)
-		s.handleSavedataDelete(w, r)
+			return
-	case "/savedata/clear":
+		}
-		s.handleSavedataClear(w, r)
 
+		datatype := -1
+		if r.URL.Query().Has("datatype") {
+			datatype, err = strconv.Atoi(r.URL.Query().Get("datatype"))
+			if err != nil {
+				httpError(w, r, err, http.StatusBadRequest)
+				return
+			}
+		}
+
+		var slot int
+		if r.URL.Query().Has("slot") {
+			slot, err = strconv.Atoi(r.URL.Query().Get("slot"))
+			if err != nil {
+				httpError(w, r, err, http.StatusBadRequest)
+				return
+			}
+		}
+
+		var save any
+		// /savedata/delete specifies datatype, but doesn't expect data in body
+		if r.URL.Path != "/savedata/delete" {
+			if datatype == 0 {
+				var system defs.SystemSaveData
+				err = json.NewDecoder(r.Body).Decode(&system)
+				if err != nil {
+					httpError(w, r, fmt.Errorf("failed to decode request body: %s", err), http.StatusBadRequest)
+					return
+				}
+
+				save = system
+				// /savedata/clear doesn't specify datatype, it is assumed to be 1 (session)
+			} else if datatype == 1 || r.URL.Path == "/savedata/clear" {
+				var session defs.SessionSaveData
+				err = json.NewDecoder(r.Body).Decode(&session)
+				if err != nil {
+					httpError(w, r, fmt.Errorf("failed to decode request body: %s", err), http.StatusBadRequest)
+					return
+				}
+
+				save = session
+			}
+		}
+
+		switch r.URL.Path {
+		case "/savedata/get":
+			save, err = handleSavedataGet(uuid, datatype, slot)
+		case "/savedata/update":
+			err = handleSavedataUpdate(uuid, slot, save)
+		case "/savedata/delete":
+			err = handleSavedataDelete(uuid, datatype, slot)
+		case "/savedata/clear":
+			// doesn't return a save, but it works
+			save, err = handleSavedataClear(uuid, slot, save.(defs.SessionSaveData))
+		}
+		if err != nil {
+			httpError(w, r, err, http.StatusInternalServerError)
+			return
+		}
+
+		if save == nil {
+			w.WriteHeader(http.StatusOK)
+		}
+
+		response, err := json.Marshal(save)
+		if err != nil {
+			httpError(w, r, fmt.Errorf("failed to marshal response json: %s", err), http.StatusInternalServerError)
+			return
+		}
+
+		w.Write(response)
+
+		// /daily
 	case "/daily/seed":
-		s.handleSeed(w)
+		w.Write([]byte(dailyRunSeed))
 	case "/daily/rankings":
-		s.handleRankings(w, r)
+		uuid, err := getUUIDFromRequest(r)
+		if err != nil {
+			httpError(w, r, err, http.StatusBadRequest)
+			return
+		}
+
+		var category int
+		if r.URL.Query().Has("category") {
+			category, err = strconv.Atoi(r.URL.Query().Get("category"))
+			if err != nil {
+				httpError(w, r, fmt.Errorf("failed to convert category: %s", err), http.StatusBadRequest)
+				return
+			}
+		}
+
+		page := 1
+		if r.URL.Query().Has("page") {
+			page, err = strconv.Atoi(r.URL.Query().Get("page"))
+			if err != nil {
+				httpError(w, r, fmt.Errorf("failed to convert page: %s", err), http.StatusBadRequest)
+				return
+			}
+		}
+
+		rankings, err := handleRankings(uuid, category, page)
+		if err != nil {
+			httpError(w, r, err, http.StatusInternalServerError)
+			return
+		}
+
+		response, err := json.Marshal(rankings)
+		if err != nil {
+			httpError(w, r, fmt.Errorf("failed to marshal response json: %s", err), http.StatusInternalServerError)
+			return
+		}
+
+		w.Write(response)
 	case "/daily/rankingpagecount":
-		s.handleRankingPageCount(w, r)
+		var category int
+		if r.URL.Query().Has("category") {
+			var err error
+			category, err = strconv.Atoi(r.URL.Query().Get("category"))
+			if err != nil {
+				httpError(w, r, fmt.Errorf("failed to convert category: %s", err), http.StatusBadRequest)
+				return
+			}
+		}
+
+		count, err := handleRankingPageCount(category)
+		if err != nil {
+			httpError(w, r, err, http.StatusInternalServerError)
+		}
+
+		w.Write([]byte(strconv.Itoa(count)))
 	}
 }
 

api/savedata.go

@@ -4,10 +4,8 @@ import (
 	"bytes"
 	"encoding/gob"
 	"encoding/hex"
-	"encoding/json"
 	"fmt"
 	"log"
-	"net/http"
 	"os"
 	"strconv"
 
@@ -19,228 +17,146 @@ import (
 const sessionSlotCount = 3
 
 // /savedata/get - get save data
-func (s *Server) handleSavedataGet(w http.ResponseWriter, r *http.Request) {
+func handleSavedataGet(uuid []byte, datatype, slot int) (any, error) {
-	uuid, err := getUUIDFromRequest(r)
+	switch datatype {
-	if err != nil {
+	case 0: // System
-		httpError(w, r, err.Error(), http.StatusBadRequest)
-		return
-	}
-
-	switch r.URL.Query().Get("datatype") {
-	case "0": // System
 		system, err := readSystemSaveData(uuid)
 		if err != nil {
-			httpError(w, r, err.Error(), http.StatusInternalServerError)
+			return nil, err
-			return
 		}
 
-		saveJson, err := json.Marshal(system)
+		return system, nil
+	case 1: // Session
+		if slot < 0 || slot >= sessionSlotCount {
+			return nil, fmt.Errorf("slot id %d out of range", slot)
+		}
+
+		session, err := readSessionSaveData(uuid, slot)
 		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to marshal save to json: %s", err), http.StatusInternalServerError)
+			return nil, err
-			return
 		}
 
-		w.Write(saveJson)
+		return session, nil
-	case "1": // Session
-		slotID, err := strconv.Atoi(r.URL.Query().Get("slot"))
-		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to convert slot id: %s", err), http.StatusBadRequest)
-			return
-		}
-
-		if slotID < 0 || slotID >= sessionSlotCount {
-			httpError(w, r, fmt.Sprintf("slot id %d out of range", slotID), http.StatusBadRequest)
-			return
-		}
-
-		session, err := readSessionSaveData(uuid, slotID)
-		if err != nil {
-			httpError(w, r, err.Error(), http.StatusInternalServerError)
-			return
-		}
-
-		saveJson, err := json.Marshal(session)
-		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to marshal save to json: %s", err), http.StatusInternalServerError)
-			return
-		}
-
-		w.Write(saveJson)
 	default:
-		httpError(w, r, "invalid data type", http.StatusBadRequest)
+		return nil, fmt.Errorf("invalid data type")
-		return
 	}
 }
 
 // /savedata/update - update save data
-func (s *Server) handleSavedataUpdate(w http.ResponseWriter, r *http.Request) {
+func handleSavedataUpdate(uuid []byte, slot int, save any) error {
-	uuid, err := getUUIDFromRequest(r)
+	err := db.UpdateAccountLastActivity(uuid)
-	if err != nil {
-		httpError(w, r, err.Error(), http.StatusBadRequest)
-		return
-	}
-
-	err = db.UpdateAccountLastActivity(uuid)
 	if err != nil {
 		log.Print("failed to update account last activity")
 	}
 
 	hexUUID := hex.EncodeToString(uuid)
 
-	switch r.URL.Query().Get("datatype") {
+	switch save := save.(type) {
-	case "0": // System
+	case defs.SystemSaveData: // System
-		var system defs.SystemSaveData
+		if save.TrainerID == 0 && save.SecretID == 0 {
-		err = json.NewDecoder(r.Body).Decode(&system)
+			return fmt.Errorf("invalid system data")
-		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to decode request body: %s", err), http.StatusBadRequest)
-			return
 		}
 
-		if system.TrainerID == 0 && system.SecretID == 0 {
+		err = db.UpdateAccountStats(uuid, save.GameStats)
-			httpError(w, r, "invalid system data", http.StatusInternalServerError)
-			return
-		}
-
-		err = db.UpdateAccountStats(uuid, system.GameStats)
 		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to update account stats: %s", err), http.StatusBadRequest)
+			return fmt.Errorf("failed to update account stats: %s", err)
-			return
 		}
 
 		var gobBuffer bytes.Buffer
-		err = gob.NewEncoder(&gobBuffer).Encode(system)
+		err = gob.NewEncoder(&gobBuffer).Encode(save)
 		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to serialize save: %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to serialize save: %s", err)
-			return
 		}
 
 		zstdWriter, err := zstd.NewWriter(nil)
 		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to create zstd writer, %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to create zstd writer, %s", err)
-			return
 		}
 
 		compressed := zstdWriter.EncodeAll(gobBuffer.Bytes(), nil)
 
 		err = os.MkdirAll("userdata/"+hexUUID, 0755)
 		if err != nil && !os.IsExist(err) {
-			httpError(w, r, fmt.Sprintf("failed to create userdata folder: %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to create userdata folder: %s", err)
-			return
 		}
 
 		err = os.WriteFile("userdata/"+hexUUID+"/system.pzs", compressed, 0644)
 		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to write save file: %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to write save file: %s", err)
-			return
 		}
-	case "1": // Session
+	case defs.SessionSaveData: // Session
-		slotID, err := strconv.Atoi(r.URL.Query().Get("slot"))
+		if slot < 0 || slot >= sessionSlotCount {
-		if err != nil {
+			return fmt.Errorf("slot id %d out of range", slot)
-			httpError(w, r, fmt.Sprintf("failed to convert slot id: %s", err), http.StatusBadRequest)
-			return
-		}
-
-		if slotID < 0 || slotID >= sessionSlotCount {
-			httpError(w, r, fmt.Sprintf("slot id %d out of range", slotID), http.StatusBadRequest)
-			return
 		}
 
 		fileName := "session"
-		if slotID != 0 {
+		if slot != 0 {
-			fileName += strconv.Itoa(slotID)
+			fileName += strconv.Itoa(slot)
-		}
-
-		var session defs.SessionSaveData
-		err = json.NewDecoder(r.Body).Decode(&session)
-		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to decode request body: %s", err), http.StatusBadRequest)
-			return
 		}
 
 		var gobBuffer bytes.Buffer
-		err = gob.NewEncoder(&gobBuffer).Encode(session)
+		err = gob.NewEncoder(&gobBuffer).Encode(save)
 		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to serialize save: %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to serialize save: %s", err)
-			return
 		}
 
 		zstdWriter, err := zstd.NewWriter(nil)
 		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to create zstd writer, %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to create zstd writer, %s", err)
-			return
 		}
 
 		compressed := zstdWriter.EncodeAll(gobBuffer.Bytes(), nil)
 
 		err = os.MkdirAll("userdata/"+hexUUID, 0755)
 		if err != nil && !os.IsExist(err) {
-			httpError(w, r, fmt.Sprintf("failed to create userdata folder: %s", err), http.StatusInternalServerError)
+			return fmt.Errorf(fmt.Sprintf("failed to create userdata folder: %s", err))
-			return
 		}
 
 		err = os.WriteFile(fmt.Sprintf("userdata/%s/%s.pzs", hexUUID, fileName), compressed, 0644)
 		if err != nil {
-			httpError(w, r, fmt.Sprintf("failed to write save file: %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to write save file: %s", err)
-			return
 		}
 	default:
-		httpError(w, r, "invalid data type", http.StatusBadRequest)
+		return fmt.Errorf("invalid data type")
-		return
 	}
 
-	w.WriteHeader(http.StatusOK)
+	return nil
 }
 
 // /savedata/delete - delete save data
-func (s *Server) handleSavedataDelete(w http.ResponseWriter, r *http.Request) {
+func handleSavedataDelete(uuid []byte, datatype, slot int) error {
-	uuid, err := getUUIDFromRequest(r)
+	err := db.UpdateAccountLastActivity(uuid)
-	if err != nil {
-		httpError(w, r, err.Error(), http.StatusBadRequest)
-		return
-	}
-
-	err = db.UpdateAccountLastActivity(uuid)
 	if err != nil {
 		log.Print("failed to update account last activity")
 	}
 
 	hexUUID := hex.EncodeToString(uuid)
 
-	switch r.URL.Query().Get("datatype") {
+	switch datatype {
-	case "0": // System
+	case 0: // System
 		err := os.Remove("userdata/" + hexUUID + "/system.pzs")
 		if err != nil && !os.IsNotExist(err) {
-			httpError(w, r, fmt.Sprintf("failed to delete save file: %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to delete save file: %s", err)
-			return
 		}
-	case "1": // Session
+	case 1: // Session
-		slotID, err := strconv.Atoi(r.URL.Query().Get("slot"))
+		if slot < 0 || slot >= sessionSlotCount {
-		if err != nil {
+			return fmt.Errorf("slot id %d out of range", slot)
-			httpError(w, r, fmt.Sprintf("failed to convert slot id: %s", err), http.StatusBadRequest)
-			return
-		}
-
-		if slotID < 0 || slotID >= sessionSlotCount {
-			httpError(w, r, fmt.Sprintf("slot id %d out of range", slotID), http.StatusBadRequest)
-			return
 		}
 
 		fileName := "session"
-		if slotID != 0 {
+		if slot != 0 {
-			fileName += strconv.Itoa(slotID)
+			fileName += strconv.Itoa(slot)
 		}
 
 		err = os.Remove(fmt.Sprintf("userdata/%s/%s.pzs", hexUUID, fileName))
 		if err != nil && !os.IsNotExist(err) {
-			httpError(w, r, fmt.Sprintf("failed to delete save file: %s", err), http.StatusInternalServerError)
+			return fmt.Errorf("failed to delete save file: %s", err)
-			return
 		}
 	default:
-		httpError(w, r, "invalid data type", http.StatusBadRequest)
+		return fmt.Errorf("invalid data type")
-		return
 	}
 
-	w.WriteHeader(http.StatusOK)
+	return nil
 }
 
 type SavedataClearResponse struct {
@@ -248,73 +164,46 @@ type SavedataClearResponse struct {
 }
 
 // /savedata/clear - mark session save data as cleared and delete
-func (s *Server) handleSavedataClear(w http.ResponseWriter, r *http.Request) {
+func handleSavedataClear(uuid []byte, slot int, save defs.SessionSaveData) (SavedataClearResponse, error) {
-	uuid, err := getUUIDFromRequest(r)
+	err := db.UpdateAccountLastActivity(uuid)
-	if err != nil {
-		httpError(w, r, err.Error(), http.StatusBadRequest)
-		return
-	}
-
-	err = db.UpdateAccountLastActivity(uuid)
 	if err != nil {
 		log.Print("failed to update account last activity")
 	}
 
-	slotID, err := strconv.Atoi(r.URL.Query().Get("slot"))
+	if slot < 0 || slot >= sessionSlotCount {
-	if err != nil {
+		return SavedataClearResponse{}, fmt.Errorf("slot id %d out of range", slot)
-		httpError(w, r, fmt.Sprintf("failed to convert slot id: %s", err), http.StatusBadRequest)
-		return
 	}
 
-	if slotID < 0 || slotID >= sessionSlotCount {
+	sessionCompleted := validateSessionCompleted(save)
-		httpError(w, r, fmt.Sprintf("slot id %d out of range", slotID), http.StatusBadRequest)
-		return
-	}
-
-	var session defs.SessionSaveData
-	err = json.NewDecoder(r.Body).Decode(&session)
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to decode request body: %s", err), http.StatusBadRequest)
-		return
-	}
-
-	sessionCompleted := validateSessionCompleted(session)
 	newCompletion := false
 
-	if session.GameMode == 3 && session.Seed == dailyRunSeed {
+	if save.GameMode == 3 && save.Seed == dailyRunSeed {
-		waveCompleted := session.WaveIndex
+		waveCompleted := save.WaveIndex
 		if !sessionCompleted {
 			waveCompleted--
 		}
-		err = db.AddOrUpdateAccountDailyRun(uuid, session.Score, waveCompleted)
+		err = db.AddOrUpdateAccountDailyRun(uuid, save.Score, waveCompleted)
 		if err != nil {
 			log.Printf("failed to add or update daily run record: %s", err)
 		}
 	}
 
 	if sessionCompleted {
-		newCompletion, err = db.TryAddSeedCompletion(uuid, session.Seed, int(session.GameMode))
+		newCompletion, err = db.TryAddSeedCompletion(uuid, save.Seed, int(save.GameMode))
 		if err != nil {
 			log.Printf("failed to mark seed as completed: %s", err)
 		}
 	}
 
-	response, err := json.Marshal(SavedataClearResponse{Success: newCompletion})
-	if err != nil {
-		httpError(w, r, fmt.Sprintf("failed to marshal response json: %s", err), http.StatusInternalServerError)
-		return
-	}
-
 	fileName := "session"
-	if slotID != 0 {
+	if slot != 0 {
-		fileName += strconv.Itoa(slotID)
+		fileName += strconv.Itoa(slot)
 	}
 
 	err = os.Remove(fmt.Sprintf("userdata/%s/%s.pzs", hex.EncodeToString(uuid), fileName))
 	if err != nil && !os.IsNotExist(err) {
-		httpError(w, r, fmt.Sprintf("failed to delete save file: %s", err), http.StatusInternalServerError)
+		return SavedataClearResponse{}, fmt.Errorf("failed to delete save file: %s", err)
-		return
 	}
 
-	w.Write(response)
+	return SavedataClearResponse{Success: newCompletion}, nil
 }