feat: generate auth code and save

internal/oauth/code.go

@@ -1,10 +1,13 @@
 package oauth
 
 import (
+	"crypto/rand"
+	"encoding/base64"
 	"encoding/json"
-	"fmt"
+	"log"
 	"net/http"
 
+	"gitea.local/admin/hspguard/internal/cache"
 	"gitea.local/admin/hspguard/internal/util"
 	"gitea.local/admin/hspguard/internal/web"
 	"github.com/google/uuid"
@@ -25,6 +28,7 @@ func (h *OAuthHandler) getAuthCode(w http.ResponseWriter, r *http.Request) {
 
 	type Request struct {
 		Nonce    string `json:"nonce"`
+		ClientID string `json:"client_id"`
 	}
 
 	var req Request
@@ -35,7 +39,29 @@ func (h *OAuthHandler) getAuthCode(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// TODO: Create real authorization code
+	buf := make([]byte, 32)
+	_, err = rand.Read(buf)
+	if err != nil {
+		log.Println("ERR: Failed to generate auth code:", err)
+		web.Error(w, "failed to create authorization code", http.StatusInternalServerError)
+		return
+	}
+	authCode := base64.RawURLEncoding.EncodeToString(buf)
+
+	params := cache.SaveAuthCodeParams{
+		AuthCode: authCode,
+		UserID:   user.ID.String(),
+		ClientID: req.ClientID,
+		Nonce:    req.Nonce,
+	}
+
+	log.Printf("DEBUG: Saving auth code session with params: %#v\n", params)
+
+	if err := h.cache.SaveAuthCode(r.Context(), &params); err != nil {
+		log.Println("ERR: Failed to save auth code in redis:", err)
+		web.Error(w, "failed to generate auth code", http.StatusInternalServerError)
+		return
+	}
 
 	type Response struct {
 		Code string `json:"code"`
@@ -46,7 +72,7 @@ func (h *OAuthHandler) getAuthCode(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 
 	if err := encoder.Encode(Response{
-		Code: fmt.Sprintf("%s,%s", user.ID.String(), req.Nonce),
+		Code: authCode,
 	}); err != nil {
 		web.Error(w, "failed to encode response", http.StatusInternalServerError)
 	}