补充漏推送的东西

accounts/static/accounts/login.js

@@ -36,6 +36,20 @@ async function aesGcmEncrypt(aesKey, ivBytes, dataBytes) {
   return new Uint8Array(ct);
 }
 
+let needCaptcha = false;
+
+async function loadCaptcha() {
+  const csrftoken = getCookie('csrftoken');
+  const resp = await fetch('/accounts/captcha/', { method: 'GET', credentials: 'same-origin', headers: { 'X-CSRFToken': csrftoken || '' } });
+  const data = await resp.json();
+  if (resp.ok && data.ok) {
+    const img = document.getElementById('captchaImg');
+    const box = document.getElementById('captchaBox');
+    img.src = 'data:image/png;base64,' + data.image_b64;
+    box.style.display = 'block';
+  }
+}
+
 document.getElementById('loginForm').addEventListener('submit', async (e) => {
   e.preventDefault();
   const errorEl = document.getElementById('error');
@@ -68,7 +82,9 @@ document.getElementById('loginForm').addEventListener('submit', async (e) => {
 
     const aesKey = await importAesKey(aesKeyRaw);
     const iv = new Uint8Array(12); window.crypto.getRandomValues(iv);
-    const payload = new TextEncoder().encode(JSON.stringify({ username, password }));
+    const obj = { username, password };
+    if (needCaptcha) obj.captcha = (document.getElementById('captcha').value || '').trim();
+    const payload = new TextEncoder().encode(JSON.stringify(obj));
     const ct = await aesGcmEncrypt(aesKey, iv, payload);
     const ctB64 = arrayBufferToBase64(ct);
     const ivB64 = arrayBufferToBase64(iv);
@@ -77,7 +93,10 @@ document.getElementById('loginForm').addEventListener('submit', async (e) => {
       method: 'POST', credentials: 'same-origin', headers: { 'Content-Type': 'application/json', 'X-CSRFToken': csrftoken || '' }, body: JSON.stringify({ iv: ivB64, ciphertext: ctB64 })
     });
     const submitJson = await submitResp.json();
-    if (!submitResp.ok || !submitJson.ok) throw new Error(submitJson.message || '登录失败');
+    if (!submitResp.ok || !submitJson.ok) {
+      if (submitJson && submitJson.captcha_required) { needCaptcha = true; await loadCaptcha(); }
+      throw new Error(submitJson.message || '登录失败');
+    }
     window.location.href = submitJson.redirect_url;
   } catch (err) {
     console.error(err);
@@ -85,4 +104,9 @@ document.getElementById('loginForm').addEventListener('submit', async (e) => {
   } finally {
     btn.disabled = false;
   }
+});
+
+document.getElementById('refreshCaptcha').addEventListener('click', async () => {
+  needCaptcha = true;
+  await loadCaptcha();
 });

accounts/templates/accounts/login.html

@@ -30,6 +30,15 @@
         <label for="password">密码</label>
         <input id="password" name="password" type="password" autocomplete="current-password" required />
 
+        <div id="captchaBox" style="display:none; margin-top:12px;">
+          <label for="captcha">验证码</label>
+          <div style="display:flex; gap:8px; align-items:center;">
+            <input id="captcha" name="captcha" type="text" autocomplete="off" style="flex:1;" />
+            <img id="captchaImg" alt="验证码" style="height:40px; border:1px solid #dcdde1; border-radius:6px;" />
+            <button id="refreshCaptcha" type="button" style="width:auto;">刷新</button>
+          </div>
+        </div>
+
         <button id="loginBtn" type="submit">登录</button>
         <div id="error" class="error"></div>
     </form>

accounts/urls.py

@@ -5,6 +5,7 @@ app_name = "accounts"
 urlpatterns = [
     path("login/", views.login_page, name="login"),
     path("pubkey/", views.pubkey, name="pubkey"),
+    path("captcha/", views.captcha, name="captcha"),
     path("session-key/", views.set_session_key, name="set_session_key"),
     path("login/secure-submit/", views.secure_login_submit, name="secure_login_submit"),
     path("logout/", views.logout, name="logout"),

accounts/views.py

@@ -1,6 +1,9 @@
 import base64
 import json
 import os
+import io
+import random
+import string
 
 from django.http import JsonResponse, HttpResponseBadRequest
 from django.shortcuts import render, redirect
@@ -24,6 +27,22 @@ def pubkey(request):
     pk_b64 = get_public_key_spki_b64()
     return JsonResponse({"public_key_spki": pk_b64})
 
+@require_http_methods(["GET"])
+@ensure_csrf_cookie
+def captcha(request):
+    try:
+        from captcha.image import ImageCaptcha
+    except Exception:
+        return JsonResponse({"ok": False, "message": "captcha unavailable"}, status=500)
+    code = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(5))
+    request.session["captcha_code"] = code
+    img = ImageCaptcha(width=160, height=60)
+    image = img.generate_image(code)
+    buf = io.BytesIO()
+    image.save(buf, format="PNG")
+    b64 = base64.b64encode(buf.getvalue()).decode("ascii")
+    return JsonResponse({"ok": True, "image_b64": b64})
+
 
 @require_http_methods(["POST"])
 @csrf_protect
@@ -66,11 +85,18 @@ def secure_login_submit(request):
     password = (obj.get("password") or "")
     if not username or not password:
         return HttpResponseBadRequest("Missing credentials")
+    if bool(request.session.get("login_failed_once")):
+        ans = (obj.get("captcha") or "").strip()
+        code = request.session.get("captcha_code")
+        if not ans or not code or ans.lower() != str(code).lower():
+            return JsonResponse({"ok": False, "message": "验证码错误", "captcha_required": True}, status=401)
     user = get_user_by_username(username)
     if not user:
-        return JsonResponse({"ok": False, "message": "User not found"}, status=401)
+        request.session["login_failed_once"] = True
+        return JsonResponse({"ok": False, "message": "用户不存在", "captcha_required": True}, status=401)
     if not verify_password(password, user.get("password_salt") or "", user.get("password_hash") or ""):
-        return JsonResponse({"ok": False, "message": "Invalid credentials"}, status=401)
+        request.session["login_failed_once"] = True
+        return JsonResponse({"ok": False, "message": "账户或密码错误", "captcha_required": True}, status=401)
     try:
         request.session.cycle_key()
     except Exception:
@@ -83,6 +109,10 @@ def secure_login_submit(request):
         request.session["permission"] = 1
     if "session_enc_key_b64" in request.session:
         del request.session["session_enc_key_b64"]
+    if "login_failed_once" in request.session:
+        del request.session["login_failed_once"]
+    if "captcha_code" in request.session:
+        del request.session["captcha_code"]
     return JsonResponse({"ok": True, "redirect_url": f"/main/home/?user_id={user['user_id']}"})