style: code maid is here!

refactored the project significantly to reduce the single-file monolith

routes/discord.go

@@ -0,0 +1,115 @@
+package routes
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/imroc/req/v3"
+	"github.com/redis/go-redis/v9"
+
+	g "github.com/vencord/backend/globals"
+	"github.com/vencord/backend/util"
+)
+
+// /v1/oauth
+
+type DiscordAccessTokenResult struct {
+	AccessToken string `json:"access_token"`
+}
+
+type DiscordUserResult struct {
+	Id string `json:"id"`
+}
+
+// /v1/oauth/callback
+func GETOAuthCallback(c *fiber.Ctx) error {
+	code := c.Query("code")
+
+	if code == "" {
+		return c.Status(400).JSON(&fiber.Map{
+			"error": "Missing code",
+		})
+	}
+
+	var accessTokenResult DiscordAccessTokenResult
+
+	res, err := req.R().SetFormData(map[string]string{
+		"client_id":     g.DISCORD_CLIENT_ID,
+		"client_secret": g.DISCORD_CLIENT_SECRET,
+		"grant_type":    "authorization_code",
+		"code":          code,
+		"redirect_uri":  g.DISCORD_REDIRECT_URI,
+		"scope":         "identify",
+	}).SetSuccessResult(&accessTokenResult).Post("https://discord.com/api/oauth2/token")
+
+	if err != nil {
+		return c.Status(500).JSON(&fiber.Map{
+			"error": "Failed to request access token",
+		})
+	}
+
+	if res.IsErrorState() {
+		return c.Status(400).JSON(&fiber.Map{
+			"error": "Invalid code",
+		})
+	}
+
+	accessToken := accessTokenResult.AccessToken
+
+	var userResult DiscordUserResult
+
+	res, err = req.R().SetHeaders(map[string]string{
+		"Authorization": "Bearer " + accessToken,
+	}).SetSuccessResult(&userResult).Get("https://discord.com/api/users/@me")
+
+	if err != nil {
+		return c.Status(500).JSON(&fiber.Map{
+			"error": "Failed to request user",
+		})
+	}
+
+	if res.IsErrorState() {
+		return c.Status(500).JSON(&fiber.Map{
+			"error": "Failed to request user",
+		})
+	}
+
+	userId := userResult.Id
+
+	if g.ALLOWED_USERS != nil && !g.ALLOWED_USERS[userId] {
+		return c.Status(403).JSON(&fiber.Map{
+			"error": "User is not whitelisted",
+		})
+	}
+
+	secret, err := g.RDB.Get(c.Context(), "secrets:"+util.Hash(g.PEPPER_SECRETS+userId)).Result()
+
+	if err == redis.Nil {
+		key := make([]byte, 48)
+
+		_, err := rand.Read(key)
+		if err != nil {
+			return c.Status(500).JSON(&fiber.Map{
+				"error": "Failed to generate secret",
+			})
+		}
+
+		secret = hex.EncodeToString(key)
+		g.RDB.Set(c.Context(), "secrets:"+util.Hash(g.PEPPER_SECRETS+userId), secret, 0)
+	} else if err != nil {
+		panic(err)
+	}
+
+	return c.JSON(&fiber.Map{
+		"secret": secret,
+	})
+}
+
+// /v1/oauth/settings
+func GETOAuthSettings(c *fiber.Ctx) error {
+	return c.JSON(&fiber.Map{
+		"clientId":    g.DISCORD_CLIENT_ID,
+		"redirectUri": g.DISCORD_REDIRECT_URI,
+	})
+}