rc-1

backend/routes/GET_Challenge.go

@@ -0,0 +1,43 @@
+package routes
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"gifuu/tools"
+	"net/http"
+	"strconv"
+	"time"
+)
+
+func GET_Challenge(w http.ResponseWriter, r *http.Request) {
+	query := r.URL.Query()
+
+	paramDifficulty, _ := strconv.Atoi(query.Get("difficulty"))
+	if paramDifficulty < 18 {
+		tools.SendClientError(w, r, tools.ERROR_CHALLENGE_TOO_EASY)
+		return
+	}
+
+	// Create Session
+	nonce := make([]byte, 16)
+	if _, err := rand.Read(nonce); err != nil {
+		tools.SendServerError(w, r, err)
+		return
+	}
+	normal := hex.EncodeToString(nonce)
+	expiry := time.Now().Add(5 * time.Minute).Unix()
+
+	// Store Session
+	tools.ChallengeAtomic.Lock()
+	tools.ChallengeSession[normal] = tools.ChallengeSessionData{
+		Expires:    expiry,
+		Difficulty: paramDifficulty,
+	}
+	tools.ChallengeAtomic.Unlock()
+
+	tools.SendJSON(w, r, http.StatusOK, map[string]any{
+		"nonce":      normal,
+		"difficulty": paramDifficulty,
+		"expires":    expiry,
+	})
+}