Added support for Discord OAuth2 (#25)

* Need a login check

* chore: Add Discord OAuth2 authentication endpoint

chore: Update dependencies and clean up code

chore: Update dependencies, add Discord OAuth2 authentication endpoint, and clean up code

chore: Update dependencies, add Google OAuth2 authentication endpoint, and clean up code

Code clean up

uniqueness on external account id

chore: Add Discord and Google OAuth2 authentication endpoints, and update dependencies

code review fixes

* chore: Update prodHandler to use clienturl flag for Access-Control-Allow-Origin

* chore: Refactor FetchDiscordIdByUsername and FetchGoogleIdByUsername to handle null values

* chore: Set secure and same-site attributes for session cookie

* chore: Set session cookie expiration to 3 months

* Update callback URL for Oauth2 client in docker-compose and rogueserver.go

* Update callback URL for Oauth2 client in docker-compose and rogueserver.go

---------

Co-authored-by: Matthew Olker <matthew.olker@gmail.com>

Dockerfile

@@ -23,6 +23,7 @@ FROM scratch
 WORKDIR /app
 
 COPY --from=builder /src/rogueserver .
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 
 EXPOSE 8001
 

api/account/discord.go

@@ -0,0 +1,104 @@
+/*
+	Copyright (C) 2024  Pagefault Games
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package account
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/url"
+	"os"
+)
+
+func HandleDiscordCallback(w http.ResponseWriter, r *http.Request) (string, error) {
+	code := r.URL.Query().Get("code")
+	gameUrl := os.Getenv("GAME_URL")
+	if code == "" {
+		defer http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+		return "", errors.New("code is empty")
+	}
+
+	discordId, err := RetrieveDiscordId(code)
+	if err != nil {
+		defer http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+		return "", err
+	}
+
+	return discordId, nil
+}
+
+func RetrieveDiscordId(code string) (string, error) {
+	token, err := http.PostForm("https://discord.com/api/oauth2/token", url.Values{
+		"client_id":     {os.Getenv("DISCORD_CLIENT_ID")},
+		"client_secret": {os.Getenv("DISCORD_CLIENT_SECRET")},
+		"grant_type":    {"authorization_code"},
+		"code":          {code},
+		"redirect_uri":  {os.Getenv("DISCORD_CALLBACK_URL")},
+		"scope":         {"identify"},
+	})
+
+	if err != nil {
+		return "", err
+	}
+
+	// extract access_token from token
+	type TokenResponse struct {
+		AccessToken  string `json:"access_token"`
+		TokenType    string `json:"token_type"`
+		ExpiresIn    int    `json:"expires_in"`
+		Scope        string `json:"scope"`
+		RefreshToken string `json:"refresh_token"`
+	}
+
+	var tokenResponse TokenResponse
+	err = json.NewDecoder(token.Body).Decode(&tokenResponse)
+	if err != nil {
+		return "", err
+	}
+
+	access_token := tokenResponse.AccessToken
+	if access_token == "" {
+		return "", errors.New("access token is empty")
+	}
+
+	client := &http.Client{}
+	req, err := http.NewRequest("GET", "https://discord.com/api/users/@me", nil)
+	if err != nil {
+		return "", err
+	}
+
+	req.Header.Set("Authorization", "Bearer "+access_token)
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", err
+	}
+
+	defer resp.Body.Close()
+
+	type User struct {
+		Id string `json:"id"`
+	}
+
+	var user User
+	err = json.NewDecoder(resp.Body).Decode(&user)
+	if err != nil {
+		return "", err
+	}
+
+	return user.Id, nil
+}

api/account/google.go

@@ -0,0 +1,97 @@
+/*
+	Copyright (C) 2024  Pagefault Games
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package account
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/url"
+	"os"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+func HandleGoogleCallback(w http.ResponseWriter, r *http.Request) (string, error) {
+	code := r.URL.Query().Get("code")
+	gameUrl := os.Getenv("GAME_URL")
+	if code == "" {
+		defer http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+		return "", errors.New("code is empty")
+	}
+
+	googleId, err := RetrieveGoogleId(code)
+	if err != nil {
+		defer http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+		return "", err
+	}
+
+	return googleId, nil
+}
+
+func RetrieveGoogleId(code string) (string, error) {
+	token, err := http.PostForm("https://oauth2.googleapis.com/token", url.Values{
+		"client_id":     {os.Getenv("GOOGLE_CLIENT_ID")},
+		"client_secret": {os.Getenv("GOOGLE_CLIENT_SECRET")},
+		"code":          {code},
+		"grant_type":    {"authorization_code"},
+		"redirect_uri":  {os.Getenv("GOOGLE_CALLBACK_URL")},
+	})
+
+	if err != nil {
+		return "", err
+	}
+	defer token.Body.Close()
+	type TokenResponse struct {
+		AccessToken  string `json:"access_token"`
+		TokenType    string `json:"token_type"`
+		ExpiresIn    int    `json:"expires_in"`
+		IdToken      string `json:"id_token"`
+		RefreshToken string `json:"refresh_token"`
+		Scope        string `json:"scope"`
+	}
+	var tokenResponse TokenResponse
+	err = json.NewDecoder(token.Body).Decode(&tokenResponse)
+	if err != nil {
+		return "", err
+	}
+
+	userId, err := parseJWTWithoutValidation(tokenResponse.IdToken)
+	if err != nil {
+		return "", err
+	}
+
+	return userId, nil
+}
+
+func parseJWTWithoutValidation(idToken string) (string, error) {
+	parser := jwt.NewParser()
+
+	// Use ParseUnverified to parse the token without validation
+	parsedJwt, _, err := parser.ParseUnverified(idToken, jwt.MapClaims{})
+	if err != nil {
+		return "", err
+	}
+
+	claims, ok := parsedJwt.Claims.(jwt.MapClaims)
+	if !ok {
+		return "", errors.New("invalid token claims")
+	}
+
+	return claims.GetSubject()
+}

api/account/info.go

@@ -23,12 +23,19 @@ import (
 
 type InfoResponse struct {
 	Username        string `json:"username"`
+	DiscordId       string `json:"discordId"`
+	GoogleId        string `json:"googleId"`
 	LastSessionSlot int    `json:"lastSessionSlot"`
 }
 
 // /account/info - get account info
-func Info(username string, uuid []byte) (InfoResponse, error) {
+func Info(username string, discordId string, googleId string, uuid []byte) (InfoResponse, error) {
 	slot, _ := db.GetLatestSessionSaveDataSlot(uuid)
-
+	response := InfoResponse{
-	return InfoResponse{Username: username, LastSessionSlot: slot}, nil
+		Username:        username,
+		LastSessionSlot: slot,
+		DiscordId:       discordId,
+		GoogleId:        googleId,
+	}
+	return response, nil
 }

api/account/login.go

@@ -55,18 +55,25 @@ func Login(username, password string) (LoginResponse, error) {
 		return response, fmt.Errorf("password doesn't match")
 	}
 
-	token := make([]byte, TokenSize)
+	response.Token, err = GenerateTokenForUsername(username)
-	_, err = rand.Read(token)
+
 	if err != nil {
 		return response, fmt.Errorf("failed to generate token: %s", err)
 	}
 
-	err = db.AddAccountSession(username, token)
-	if err != nil {
-		return response, fmt.Errorf("failed to add account session")
-	}
-
-	response.Token = base64.StdEncoding.EncodeToString(token)
-
 	return response, nil
 }
+
+func GenerateTokenForUsername(username string) (string, error) {
+	token := make([]byte, TokenSize)
+	_, err := rand.Read(token)
+	if err != nil {
+		return "", fmt.Errorf("failed to generate token: %s", err)
+	}
+
+	err = db.AddAccountSession(username, token)
+	if err != nil {
+		return "", fmt.Errorf("failed to add account session")
+	}
+	return base64.StdEncoding.EncodeToString(token), nil
+}

api/common.go

@@ -63,6 +63,9 @@ func Init(mux *http.ServeMux) error {
 	mux.HandleFunc("GET /daily/rankings", handleDailyRankings)
 	mux.HandleFunc("GET /daily/rankingpagecount", handleDailyRankingPageCount)
 
+	// auth
+	mux.HandleFunc("/auth/{provider}/callback", handleProviderCallback)
+	mux.HandleFunc("/auth/{provider}/logout", handleProviderLogout)
 	return nil
 }
 

api/endpoints.go

@@ -19,11 +19,15 @@ package api
 
 import (
 	"database/sql"
+	"encoding/base64"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"net/http"
+	"os"
 	"strconv"
+	"strings"
+	"time"
 
 	"github.com/pagefaultgames/rogueserver/api/account"
 	"github.com/pagefaultgames/rogueserver/api/daily"
@@ -37,7 +41,6 @@ import (
 	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.
 */
-
 // account
 
 func handleAccountInfo(w http.ResponseWriter, r *http.Request) {
@@ -52,13 +55,25 @@ func handleAccountInfo(w http.ResponseWriter, r *http.Request) {
 		httpError(w, r, err, http.StatusInternalServerError)
 		return
 	}
-
+	discordId, err := db.FetchDiscordIdByUsername(username)
-	response, err := account.Info(username, uuid)
+	if err != nil {
+		if !errors.Is(err, sql.ErrNoRows) {
+			httpError(w, r, err, http.StatusInternalServerError)
+			return
+		}
+	}
+	googleId, err := db.FetchGoogleIdByUsername(username)
+	if err != nil {
+		if !errors.Is(err, sql.ErrNoRows) {
+			httpError(w, r, err, http.StatusInternalServerError)
+			return
+		}
+	}
+	response, err := account.Info(username, discordId, googleId, uuid)
 	if err != nil {
 		httpError(w, r, err, http.StatusInternalServerError)
 		return
 	}
-
 	writeJSON(w, r, response)
 }
 
@@ -543,3 +558,107 @@ func handleDailyRankingPageCount(w http.ResponseWriter, r *http.Request) {
 
 	w.Write([]byte(strconv.Itoa(count)))
 }
+
+// redirect link after authorizing application link
+func handleProviderCallback(w http.ResponseWriter, r *http.Request) {
+	provider := r.PathValue("provider")
+	state := r.URL.Query().Get("state")
+	gameUrl := os.Getenv("GAME_URL")
+	var externalAuthId string
+	var err error
+	switch provider {
+	case "discord":
+		externalAuthId, err = account.HandleDiscordCallback(w, r)
+	case "google":
+		externalAuthId, err = account.HandleGoogleCallback(w, r)
+	default:
+		http.Error(w, "invalid provider", http.StatusBadRequest)
+		return
+	}
+
+	if err != nil {
+		httpError(w, r, err, http.StatusInternalServerError)
+		return
+	}
+
+	if state != "" {
+		state = strings.Replace(state, " ", "+", -1)
+		stateByte, err := base64.StdEncoding.DecodeString(state)
+		if err != nil {
+			http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+			return
+		}
+
+		userName, err := db.FetchUsernameBySessionToken(stateByte)
+		if err != nil {
+			http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+			return
+		}
+
+		switch provider {
+		case "discord":
+			err = db.AddDiscordIdByUsername(externalAuthId, userName)
+		case "google":
+			err = db.AddGoogleIdByUsername(externalAuthId, userName)
+		}
+
+		if err != nil {
+			http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+			return
+		}
+
+	} else {
+		var userName string
+		switch provider {
+		case "discord":
+			userName, err = db.FetchUsernameByDiscordId(externalAuthId)
+		case "google":
+			userName, err = db.FetchUsernameByGoogleId(externalAuthId)
+		}
+		if err != nil {
+			http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+			return
+		}
+
+		sessionToken, err := account.GenerateTokenForUsername(userName)
+		if err != nil {
+			http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+			return
+		}
+
+		http.SetCookie(w, &http.Cookie{
+			Name:     "pokerogue_sessionId",
+			Value:    sessionToken,
+			Path:     "/",
+			Secure:   true,
+			SameSite: http.SameSiteStrictMode,
+			Domain:   "beta.pokerogue.net",
+			Expires:  time.Now().Add(time.Hour * 24 * 30 * 3), // 3 months
+		})
+	}
+
+	defer http.Redirect(w, r, gameUrl, http.StatusSeeOther)
+}
+
+func handleProviderLogout(w http.ResponseWriter, r *http.Request) {
+	uuid, err := uuidFromRequest(r)
+	if err != nil {
+		httpError(w, r, err, http.StatusBadRequest)
+		return
+	}
+
+	switch r.PathValue("provider") {
+	case "discord":
+		err = db.RemoveDiscordIdByUUID(uuid)
+	case "google":
+		err = db.RemoveGoogleIdByUUID(uuid)
+	default:
+		http.Error(w, "invalid provider", http.StatusBadRequest)
+		return
+	}
+	if err != nil {
+		httpError(w, r, err, http.StatusInternalServerError)
+		return
+	}
+	w.WriteHeader(http.StatusOK)
+}

db/account.go

@@ -50,6 +50,82 @@ func AddAccountSession(username string, token []byte) error {
 	return nil
 }
 
+func AddDiscordIdByUsername(discordId string, username string) error {
+	_, err := handle.Exec("UPDATE accounts SET discordId = ? WHERE username = ?", discordId, username)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func AddGoogleIdByUsername(googleId string, username string) error {
+	_, err := handle.Exec("UPDATE accounts SET googleId = ? WHERE username = ?", googleId, username)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func FetchUsernameByDiscordId(discordId string) (string, error) {
+	var username string
+	err := handle.QueryRow("SELECT username FROM accounts WHERE discordId = ?", discordId).Scan(&username)
+	if err != nil {
+		return "", err
+	}
+
+	return username, nil
+}
+
+func FetchUsernameByGoogleId(googleId string) (string, error) {
+	var username string
+	err := handle.QueryRow("SELECT username FROM accounts WHERE googleId = ?", googleId).Scan(&username)
+	if err != nil {
+		return "", err
+	}
+
+	return username, nil
+}
+
+func FetchDiscordIdByUsername(username string) (string, error) {
+	var discordId sql.NullString
+	err := handle.QueryRow("SELECT discordId FROM accounts WHERE username = ?", username).Scan(&discordId)
+	if err != nil {
+		return "", err
+	}
+
+	if !discordId.Valid {
+		return "", nil
+	}
+
+	return discordId.String, nil
+}
+
+func FetchGoogleIdByUsername(username string) (string, error) {
+	var googleId sql.NullString
+	err := handle.QueryRow("SELECT googleId FROM accounts WHERE username = ?", username).Scan(&googleId)
+	if err != nil {
+		return "", err
+	}
+
+	if !googleId.Valid {
+		return "", nil
+	}
+
+	return googleId.String, nil
+}
+
+func FetchUsernameBySessionToken(token []byte) (string, error) {
+	var username string
+	err := handle.QueryRow("SELECT a.username FROM accounts a JOIN sessions s ON a.uuid = s.uuid WHERE s.token = ?", token).Scan(&username)
+	if err != nil {
+		return "", err
+	}
+
+	return username, nil
+}
+
 func UpdateAccountPassword(uuid, key, salt []byte) error {
 	_, err := handle.Exec("UPDATE accounts SET (hash, salt) VALUES (?, ?) WHERE uuid = ?", key, salt, uuid)
 	if err != nil {
@@ -238,3 +314,21 @@ func FetchUsernameFromUUID(uuid []byte) (string, error) {
 
 	return username, nil
 }
+
+func RemoveDiscordIdByUUID(uuid []byte) error {
+	_, err := handle.Exec("UPDATE accounts SET discordId = NULL WHERE uuid = ?", uuid)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func RemoveGoogleIdByUUID(uuid []byte) error {
+	_, err := handle.Exec("UPDATE accounts SET googleId = NULL WHERE uuid = ?", uuid)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

db/db.go

@@ -97,6 +97,12 @@ func setupDb(tx *sql.Tx) error {
 		// MIGRATION 002
 
 		`DROP TABLE accountCompensations`,
+
+		// ----------------------------------
+		// MIGRATION 003
+
+		`ALTER TABLE accounts ADD COLUMN IF NOT EXISTS discordId VARCHAR(32) UNIQUE DEFAULT NULL`,
+		`ALTER TABLE accounts ADD COLUMN IF NOT EXISTS googleId VARCHAR(32) UNIQUE DEFAULT NULL`,
 	}
 
 	for _, q := range queries {

docker-compose.Example.yml

@@ -1,6 +1,6 @@
 services:
   server:
-    command: --debug --dbaddr db --dbuser pokerogue --dbpass pokerogue --dbname pokeroguedb
+    command: --debug --dbaddr db --dbuser pokerogue --dbpass pokerogue --dbname pokeroguedb --gameurl http://localhost:8000 --callbackurl http://localhost:8001 
     image: ghcr.io/pagefaultgames/rogueserver:master
     restart: unless-stopped
     depends_on:

go.mod

@@ -5,7 +5,9 @@ go 1.22
 require (
 	github.com/go-sql-driver/mysql v1.7.1
 	github.com/robfig/cron/v3 v3.0.1
-	golang.org/x/crypto v0.16.0
+	golang.org/x/crypto v0.22.0
 )
 
-require golang.org/x/sys v0.15.0 // indirect
+require github.com/golang-jwt/jwt/v5 v5.2.1
+
+require golang.org/x/sys v0.19.0 // indirect

go.sum

@@ -1,8 +1,10 @@
 github.com/go-sql-driver/mysql v1.7.1 h1:lUIinVbN1DY0xBg0eMOzmmtGoHwWBbvnWubQUrtU8EI=
 github.com/go-sql-driver/mysql v1.7.1/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
+github.com/golang-jwt/jwt/v5 v5.2.1 h1:OuVbFODueb089Lh128TAcimifWaLhJwVflnrgM17wHk=
+github.com/golang-jwt/jwt/v5 v5.2.1/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
 github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
 github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
-golang.org/x/crypto v0.16.0 h1:mMMrFzRSCF0GvB7Ne27XVtVAaXLrPmgPC7/v0tkwHaY=
+golang.org/x/crypto v0.22.0 h1:g1v0xeRhjcugydODzvb3mEM9SQ0HGp9s/nh3COQ/C30=
-golang.org/x/crypto v0.16.0/go.mod h1:gCAAfMLgwOJRpTjQ2zCCt2OcSfYMTeZVSRtQlPC7Nq4=
+golang.org/x/crypto v0.22.0/go.mod h1:vr6Su+7cTlO45qkww3VDJlzDn0ctJvRgYbC2NvXHt+M=
-golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
+golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=
-golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.19.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

rogueserver.go

@@ -44,8 +44,27 @@ func main() {
 	dbaddr := flag.String("dbaddr", "localhost", "database address")
 	dbname := flag.String("dbname", "pokeroguedb", "database name")
 
+	discordclientid := flag.String("discordclientid", "dcid", "Discord Oauth2 Client ID")
+	discordsecretid := flag.String("discordsecretid", "dsid", "Discord Oauth2 Secret ID")
+
+	googleclientid := flag.String("googleclientid", "gcid", "Google Oauth2 Client ID")
+	googlesecretid := flag.String("googlesecretid", "gsid", "Google Oauth2 Secret ID")
+	callbackurl := flag.String("callbackurl", "http://localhost:8001/", "Callback URL for Oauth2 Client")
+
+	gameurl := flag.String("gameurl", "https://pokerogue.net", "URL for game server")
+
 	flag.Parse()
 
+	// set discord client id as env variable
+	os.Setenv("DISCORD_CLIENT_ID", *discordclientid)
+	os.Setenv("DISCORD_CLIENT_SECRET", *discordsecretid)
+	os.Setenv("DISCORD_CALLBACK_URL", *callbackurl+"/auth/discord/callback")
+
+	os.Setenv("GOOGLE_CLIENT_ID", *googleclientid)
+	os.Setenv("GOOGLE_CLIENT_SECRET", *googlesecretid)
+	os.Setenv("GOOGLE_CALLBACK_URL", *callbackurl+"/auth/google/callback")
+	os.Setenv("GAME_URL", *gameurl)
+
 	// register gob types
 	gob.Register([]interface{}{})
 	gob.Register(map[string]interface{}{})
@@ -70,7 +89,7 @@ func main() {
 	}
 
 	// start web server
-	handler := prodHandler(mux)
+	handler := prodHandler(mux, gameurl)
 	if *debug {
 		handler = debugHandler(mux)
 	}
@@ -105,11 +124,11 @@ func createListener(proto, addr string) (net.Listener, error) {
 	return listener, nil
 }
 
-func prodHandler(router *http.ServeMux) http.Handler {
+func prodHandler(router *http.ServeMux, clienturl *string) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Access-Control-Allow-Headers", "Authorization, Content-Type")
 		w.Header().Set("Access-Control-Allow-Methods", "OPTIONS, GET, POST")
-		w.Header().Set("Access-Control-Allow-Origin", "https://pokerogue.net")
+		w.Header().Set("Access-Control-Allow-Origin", *clienturl)
 
 		if r.Method == "OPTIONS" {
 			w.WriteHeader(http.StatusOK)