add proxy server for dynamic api endpoint handling and auth

proxy/.env

@@ -0,0 +1,4 @@
+CLIENT_ID=
+CLIENT_SECRET=
+REDIRECT_URI=
+HOST=

proxy/auth.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+const (
+	OsuApiUrl = "https://osu.ppy.sh/api/v2"
+)
+
+var clientid = os.Getenv("CLIENT_ID")
+var clientsecret = os.Getenv("CLIENT_SECRET")
+var redirect_uri = os.Getenv("REDIRECT_URI")
+var scopes = []string{
+	"public",
+	"identify",
+}
+
+type OsuApiClient struct {
+	User       User
+	BaseURL    string
+	HTTPclient *http.Client
+}
+
+func NewOsuApiClient(user User) (*OsuApiClient, error) {
+
+	if user.Token == (Token{}) {
+		return nil, errors.New("No Valid Credentials")
+	}
+
+	if time.Now().After(user.ExpireDate) {
+
+	}
+
+	return &OsuApiClient{
+		User:    user,
+		BaseURL: OsuApiUrl,
+		HTTPclient: &http.Client{
+			Timeout: time.Minute * 2},
+	}, nil
+}
+
+func LoginRedirect(w http.ResponseWriter, r *http.Request) {
+
+	fmt.Println(r.Context())
+	cookie, ok := r.Context().Value("cookie").(string)
+
+	if !ok || cookie == "" {
+		fmt.Println(cookie, ok)
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+
+	http.Redirect(w, r,
+		fmt.Sprintf("https://osu.ppy.sh/oauth/authorize?client_id=%s&redirect_uri=%s&response_type=code&scope=%s&state=%s",
+			clientid,
+			redirect_uri,
+			strings.Join(scopes, " "),
+			cookie),
+		http.StatusPermanentRedirect)
+}

proxy/db.go

@@ -0,0 +1,100 @@
+package main
+
+import (
+	"database/sql"
+	"log"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+type User struct {
+	UserID    int
+	Name      string
+	AvatarUrl string
+	EndPoint  string
+	Token
+}
+
+type Token struct {
+	AuthToken    string
+	RefreshToken string
+	ExpireDate   time.Time
+}
+
+var db *sql.DB
+
+func InitDB() {
+	var err error
+	db, err = sql.Open("sqlite3", "database.db")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	//users
+	u := `
+	CREATE TABLE IF NOT EXISTS users (
+		id INTEGER PRIMARY KEY NOT NULL,
+		name TEXT NOT NULL,
+		endpoint TEXT,
+		avatar_url TEXT,
+		auth_token TEXT,
+		refresh_token TEXT,
+		expire_date TEXT
+	);`
+
+	_, err = db.Exec(u)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	//cookiejar
+	a := `
+	CREATE TABLE IF NOT EXISTS cookiejar (
+		id INTEGER PRIMARY KEY AUTOINCREMENT,
+		user_id INTEGER,
+		cookie TEXT NOT NULL,
+		FOREIGN KEY(user_id) REFERENCES users(id) On DELETE CASCADE
+	);`
+
+	_, err = db.Exec(a)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+}
+
+func GetUserByCookie(cookie string) (*User, error) {
+	query := `
+	SELECT users.id, users.name, users.endpoint, users.avatar_url, users.auth_token, users.refresh_token, users.expire_date
+	FROM users users
+	JOIN cookiejar cookie ON users.id = cookie.user_id
+	WHERE cookie.cookie = ?`
+	row := db.QueryRow(query, cookie)
+
+	var user User
+	err := row.Scan(&user.UserID, &user.Name, &user.EndPoint, &user.AvatarUrl, &user.AuthToken, &user.RefreshToken, &user.ExpireDate)
+	if err != nil {
+		return &User{}, err
+	}
+
+	return &user, nil
+}
+
+func SaveCookie(userID int, cookie string) error {
+	query := "INSERT INTO cookiejar (user_id, cookie) VALUES (?, ?)"
+	_, err := db.Exec(query, userID, cookie)
+	return err
+}
+
+func UpdateUserTokens(userID int, auth Token) error {
+	query := "UPDATE users SET auth_token = ?, refresh_token = ?, expire_date = ? WHERE id = ?"
+	_, err := db.Exec(query, auth.AuthToken, auth.RefreshToken, auth.ExpireDate, userID)
+	return err
+}
+
+func UpdateUserEndPoint(userID int, endPoint string) error {
+	query := "UPDATE users SET endpoint = ? WHERE id = ?"
+	_, err := db.Exec(query, endPoint, userID)
+	return err
+}

proxy/go.mod

@@ -0,0 +1,8 @@
+module proxy
+
+go 1.22.1
+
+require (
+	github.com/joho/godotenv v1.5.1
+	github.com/mattn/go-sqlite3 v1.14.22
+)

proxy/go.sum

@@ -0,0 +1,4 @@
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
+github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=

proxy/main.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/joho/godotenv"
+)
+
+func main() {
+
+	if ok := godotenv.Load(); ok != nil {
+		panic(".env not found")
+	}
+
+	InitDB()
+	err := run()
+	if err != nil {
+		fmt.Println(err)
+	}
+}

proxy/middleware.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/base64"
+	"fmt"
+	"net/http"
+	"time"
+)
+
+func AuthMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+		cookie, err := r.Cookie("session_cookie")
+		if err != nil || cookie.Value == "" {
+			http.Error(w, "Unauthorized", http.StatusUnauthorized)
+			return
+		}
+
+		user, err := GetUserByCookie(cookie.Value)
+		if err != nil || cookie.Value == "" {
+			http.Error(w, "Unauthorized", http.StatusUnauthorized)
+			return
+		}
+
+		ctx := context.WithValue(r.Context(), "user", user)
+		next.ServeHTTP(w, r.WithContext(ctx))
+
+	})
+}
+
+func CookieMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+		cookie, err := r.Cookie("session_cookie")
+		if err != nil || cookie.Value == "" {
+
+			newCookie := &http.Cookie{
+				Name:     "session_cookie",
+				Value:    "session_cookie_" + generateRandomString(64),
+				Expires:  time.Now().Add(time.Hour * 10000),
+				HttpOnly: true,
+				Secure:   true,
+				Path:     "/",
+			}
+
+			http.SetCookie(w, newCookie)
+		}
+
+		ctx := context.WithValue(r.Context(), "cookie", cookie.Value)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func generateRandomString(length int) string {
+	bytes := make([]byte, length)
+	_, err := rand.Read(bytes)
+	if err != nil {
+		fmt.Print(err)
+		return "IF_U_SEE_THIS_UR_THE_GOAT"
+	}
+
+	return base64.URLEncoding.EncodeToString(bytes)
+}

proxy/routes.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+func run() error {
+	mux := http.NewServeMux()
+
+	mux.Handle("/me", AuthMiddleware(http.HandlerFunc(MeHandler)))
+	mux.Handle("/login", http.HandlerFunc(LoginRedirect))
+
+	fmt.Println("Starting Server on :42000")
+
+	//global middleware
+	handler := CookieMiddleware(mux)
+
+	return http.ListenAndServe(":42000", handler)
+}
+
+func MeHandler(w http.ResponseWriter, r *http.Request) {
+
+	user := r.Context().Value("user").(*User)
+
+	w.Header().Set("Content-Type", "application/Json")
+
+	JSONResponse(w, http.StatusOK, user)
+}
+
+func JSONResponse(w http.ResponseWriter, statusCode int, data interface{}) {
+	w.Header().Set("Content-Type", "application/json")
+
+	w.WriteHeader(statusCode)
+
+	if err := json.NewEncoder(w).Encode(data); err != nil {
+		http.Error(w, "Failed to encode response as JSON", http.StatusInternalServerError)
+	}
+}