修复登录报错提示内容错误，增加节假日同步功能

server/utils/holiday.js

@@ -0,0 +1,141 @@
+const https = require('https');
+
+/**
+ * Fetch holiday data from timor.tech API for a specific year
+ * @param {number} year 
+ * @returns {Promise<object>}
+ */
+function fetchHolidaysFromNetwork(year) {
+  return new Promise((resolve, reject) => {
+    // Note: timor.tech API works best with trailing slash
+    const url = `https://timor.tech/api/holiday/year/${year}/`;
+    https.get(url, { headers: { 'User-Agent': 'WorkTime-Manager/1.0' } }, (res) => {
+      let rawData = '';
+      res.on('data', (chunk) => { rawData += chunk; });
+      res.on('end', () => {
+        try {
+          const parsed = JSON.parse(rawData);
+          if (parsed.code === 0 && parsed.holiday) {
+            resolve(parsed.holiday);
+          } else {
+            reject(new Error(`API returned code ${parsed.code}`));
+          }
+        } catch (e) {
+          reject(e);
+        }
+      });
+    }).on('error', (err) => {
+      reject(err);
+    });
+  });
+}
+
+/**
+ * Get holiday data for a specific year, from cache or network
+ * @param {object} db DB wrapper instance
+ * @param {number} year 
+ * @returns {Promise<object|null>}
+ */
+async function getHolidays(db, year) {
+  try {
+    const cached = db.get('SELECT holiday_data FROM holiday_cache WHERE year = ?', [year]);
+    if (cached) {
+      return JSON.parse(cached.holiday_data);
+    }
+    
+    // Not cached, fetch from network
+    console.log(`[Holiday] Fetching holiday data from network for year ${year}...`);
+    const holidays = await fetchHolidaysFromNetwork(year);
+    
+    // Save to cache
+    db.run(
+      'INSERT OR REPLACE INTO holiday_cache (year, holiday_data, updated_at) VALUES (?, ?, datetime(\'now\', \'localtime\'))',
+      [year, JSON.stringify(holidays)]
+    );
+    return holidays;
+  } catch (e) {
+    console.error(`[Holiday] Error getting holidays for ${year}:`, e.message);
+    return null;
+  }
+}
+
+/**
+ * Helper to check if a date is weekend (Sat/Sun) in local time
+ * @param {string} dateStr YYYY-MM-DD
+ * @returns {boolean}
+ */
+function isWeekendDefault(dateStr) {
+  const d = new Date(dateStr + 'T00:00:00');
+  const day = d.getDay();
+  return day === 0 || day === 6;
+}
+
+/**
+ * Calculate the number of workdays for each month in a given year
+ * @param {number} year 
+ * @param {object|null} holidayMap 
+ * @returns {Array<{month: number, days: number}>}
+ */
+function calculateMonthlyWorkdays(year, holidayMap) {
+  const result = [];
+  for (let m = 1; m <= 12; m++) {
+    const daysInMonth = new Date(year, m, 0).getDate();
+    let workdays = 0;
+    
+    for (let day = 1; day <= daysInMonth; day++) {
+      const dStr = `${year}-${String(m).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
+      const mmDd = `${String(m).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
+      
+      let isWork = true;
+      if (holidayMap && holidayMap[mmDd]) {
+        // If date is in the map, holiday === true means rest day, holiday === false means work day (調休补班)
+        isWork = !holidayMap[mmDd].holiday;
+      } else {
+        // Fall back to default weekends
+        isWork = !isWeekendDefault(dStr);
+      }
+      
+      if (isWork) {
+        workdays++;
+      }
+    }
+    result.push({ month: m, days: workdays });
+  }
+  return result;
+}
+
+/**
+ * Sync holiday data from network, calculate and update database workdays
+ * @param {object} db 
+ * @param {number} year 
+ * @returns {Promise<Array<{month: number, days: number}>>}
+ */
+async function syncYearWorkdays(db, year) {
+  // Clear cache first to force fresh fetch on manual sync request
+  db.run('DELETE FROM holiday_cache WHERE year = ?', [year]);
+  
+  const holidayMap = await getHolidays(db, year);
+  if (!holidayMap) {
+    throw new Error('无法从网络同步节假日数据，请检查网络连接');
+  }
+  
+  const monthlyWorkdays = calculateMonthlyWorkdays(year, holidayMap);
+  
+  // Save to workdays table
+  for (const item of monthlyWorkdays) {
+    const existing = db.get('SELECT id FROM workdays WHERE year = ? AND month = ?', [year, item.month]);
+    if (existing) {
+      db.run('UPDATE workdays SET days = ? WHERE year = ? AND month = ?', [item.days, year, item.month]);
+    } else {
+      db.run('INSERT INTO workdays (year, month, days) VALUES (?, ?, ?)', [year, item.month, item.days]);
+    }
+  }
+  
+  return monthlyWorkdays;
+}
+
+module.exports = {
+  getHolidays,
+  syncYearWorkdays,
+  calculateMonthlyWorkdays
+};