diff --git a/api/index.py b/api/index.py
deleted file mode 100644
index ea585ee..0000000
--- a/api/index.py
+++ /dev/null
@@ -1,43 +0,0 @@
-# -*- coding: UTF-8 -*-
-import requests
-import re
-from http.server import BaseHTTPRequestHandler
-import json
-
-def list_split(items, n):
-    return [items[i:i + n] for i in range(0, len(items), n)]
-def getdata(name):
-    gitpage = requests.get("https://github.com/" + name)
-    data = gitpage.text
-    datadatereg = re.compile(r'data-date="(.*?)" data-level')
-    datacountreg = re.compile(r'<span class="sr-only">(.*?) contribution')
-    datadate = datadatereg.findall(data)
-    datacount = datacountreg.findall(data)
-    datacount = list(map(int, [0 if i == "No" else i for i in datacount]))
-
-    # 将datadate和datacount按照字典序排序
-    sorted_data = sorted(zip(datadate, datacount))
-    datadate, datacount = zip(*sorted_data)
-    
-    contributions = sum(datacount)
-    datalist = []
-    for index, item in enumerate(datadate):
-        itemlist = {"date": item, "count": datacount[index]}
-        datalist.append(itemlist)
-    datalistsplit = list_split(datalist, 7)
-    returndata = {
-        "total": contributions,
-        "contributions": datalistsplit
-    }
-    return returndata
-class handler(BaseHTTPRequestHandler):
-    def do_GET(self):
-        path = self.path
-        user = path.split('?')[1]
-        data = getdata(user)
-        self.send_response(200)
-        self.send_header('Access-Control-Allow-Origin', '*')
-        self.send_header('Content-type', 'application/json')
-        self.end_headers()
-        self.wfile.write(json.dumps(data).encode('utf-8'))
-        return
diff --git a/app.py b/app.py
new file mode 100644
index 0000000..8f5d035
--- /dev/null
+++ b/app.py
@@ -0,0 +1,86 @@
+# -*- coding: UTF-8 -*-
+# api/index.py - GitHub Contributions API for hexo-filter-gitcalendar
+
+from flask import Flask, jsonify, request
+from flask_cors import CORS
+import requests
+from datetime import datetime, timedelta
+
+app = Flask(__name__)
+CORS(app)  # 允许所有跨域请求
+
+def list_split(items, n):
+    """将列表按每 n 个元素分割成子列表"""
+    return [items[i:i + n] for i in range(0, len(items), n)]
+
+def getdata(name):
+    try:
+        # 从第三方 API 获取数据（扁平数组）
+        url = f"https://github-contributions-api.jogruber.de/v4/{name}"
+        resp = requests.get(url, timeout=10)
+        resp.raise_for_status()
+        data = resp.json()
+        days = data.get("contributions", [])  # 扁平数组，每个元素包含 date 和 count
+
+        # 手动计算总贡献数（确保是整数）
+        total = sum(day.get("count", 0) for day in days)
+
+        # 按7天分割成周
+        weekly = list_split(days, 7)
+
+        # 补足到至少53周（前面补空周，日期递减）
+        while len(weekly) < 53:
+            # 获取当前第一周的日期
+            first_week_start = datetime.strptime(weekly[0][0]["date"], "%Y-%m-%d")
+            # 计算前一周的日期范围
+            prev_week_start = first_week_start - timedelta(weeks=1)
+            new_week = []
+            for i in range(7):
+                date = prev_week_start + timedelta(days=i)
+                new_week.append({"date": date.strftime("%Y-%m-%d"), "count": 0})
+            weekly.insert(0, new_week)
+
+        # 确保最后一周有7天（后面补空，日期递增）
+        last_week = weekly[-1]
+        if len(last_week) < 7:
+            last_date = datetime.strptime(last_week[-1]["date"], "%Y-%m-%d")
+            for i in range(1, 7 - len(last_week) + 1):
+                new_date = last_date + timedelta(days=i)
+                last_week.append({"date": new_date.strftime("%Y-%m-%d"), "count": 0})
+
+        # 只取前53周（防止超出）
+        return {
+            "total": total,
+            "contributions": weekly[:53]
+        }
+    except Exception as e:
+        return {"error": str(e)}
+
+@app.route('/')
+def home():
+    return jsonify({
+        "message": "GitHub Calendar API",
+        "usage": [
+            "/?username  - 例如 /?Sunrisepeak",
+            "/api?username=<name>  - 同上",
+            "/<username>  - 路径参数"
+        ]
+    })
+
+@app.route('/api', strict_slashes=False)
+@app.route('/', strict_slashes=False)
+def get_calendar():
+    username = request.args.get('username')
+    if not username:
+        qs = request.query_string.decode('utf-8')
+        if qs and '=' not in qs:
+            username = qs
+    if not username:
+        return jsonify({"error": "Missing username"}), 400
+    return jsonify(getdata(username))
+
+@app.route('/<username>', strict_slashes=False)
+def get_calendar_by_path(username):
+    return jsonify(getdata(username))
+
+app = app
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 570b153..93783ee 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
-certifi==2020.12.5
-chardet==4.0.0
-idna==2.10
-requests==2.25.1
-urllib3==1.26.2
+flask==3.0.0
+requests==2.31.0
+gunicorn==21.2.0
+flask-cors
\ No newline at end of file