Add 2048 src

Author: volltin

README.md

@@ -16,7 +16,7 @@
 | ------------------------------------------------------------ | ------------------------------------------------------- |
 | [签到](official/签到/README.md)                              | 无                       |
 | [猫咪问答++](official/猫咪问答++/README.md)                  | 无                 |
-| [2048](official/2048/README.md)                              | 暂无（之后会有）                       |
+| [2048](official/2048/README.md)                              | [文件、源代码](official/2048/src)                       |
 | [一闪而过的 Flag](official/一闪而过的%20Flag/README.md)      | [文件、源代码](official/一闪而过的%20Flag/src)          |
 | [从零开始的记账工具人](official/从零开始的记账工具人/README.md) | [文件、源代码](official/从零开始的记账工具人/src)       |
 | [超简单的世界模拟器](official/超简单的世界模拟器/README.md)  | [文件、源代码](official/超简单的世界模拟器/src)         |

official/2048/src/Dockerfile

@@ -0,0 +1,6 @@
+FROM tiangolo/uwsgi-nginx-flask:python3.8
+
+RUN pip3 config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
+RUN pip3 install pyopenssl
+
+COPY ./app /app

official/2048/src/app/main.py

@@ -0,0 +1,48 @@
+from flask import Flask
+from flask import request, render_template, redirect, url_for, session, make_response
+
+import OpenSSL
+import base64
+
+
+from secret import hg_dynamic_flag, secret_key
+
+app = Flask(__name__)
+app.secret_key = secret_key
+
+with open("cert.pem") as f:
+    cert = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, f.read())
+
+
+@app.before_request
+def check():
+    if request.path.startswith('/static/'):
+        return
+    if request.args.get('token'):
+        try:
+            token = request.args.get('token')
+            id, sig = token.split(":", 1)
+            sig = base64.b64decode(sig, validate=True)
+            OpenSSL.crypto.verify(cert, sig, id.encode(), "sha256")
+            session['token'] = token
+        except Exception:
+            session['token'] = None
+        return redirect(url_for('index'))
+    if session.get("token") is None:
+        return make_response(render_template("error.html"), 403)
+
+@app.route('/', methods=['GET'])
+def index():
+    return render_template('index.html')
+
+
+@app.route('/getflxg', methods=['GET'])
+def getflxg():
+    if request.args.get('my_favorite_fruit') == 'banana':
+        return hg_dynamic_flag(session['token'])
+    else:
+        return '还没有大成功，不能给你 flxg。'
+
+
+if __name__ == '__main__':
+    app.run(host='127.0.0.1', port=10005, debug=True)

official/2048/src/app/secret.py

@@ -0,0 +1,7 @@
+import hashlib
+
+flag_tpl = "flxg{8G6so5g-FLXG-%s}"
+secret_key = b"012uf:>FPL(!HNF128hf"
+
+def hg_dynamic_flag(token):
+    return flag_tpl % hashlib.sha256(('20486787gf'+token).encode()).hexdigest()[:10]

official/2048/src/app/static/bg.png

@@ -0,0 +1,33 @@
+html,
+body {
+  height: 100%;
+}
+
+body {
+  display: -ms-flexbox;
+  display: flex;
+  -ms-flex-align: center;
+  align-items: center;
+  padding-top: 40px;
+  padding-bottom: 40px;
+}
+
+.form-token {
+  width: 100%;
+  max-width: 600px;
+  padding: 15px;
+  margin: auto;
+}
+
+.form-token h1 {
+    margin-bottom: 20px;
+    color: #721c24;
+}
+
+.form-token .form-control {
+  position: relative;
+  box-sizing: border-box;
+  height: auto;
+  padding: 10px;
+  font-size: 16px;
+}

official/2048/src/app/static/bootstrap/css/bootstrap.min.css

@@ -0,0 +1,28 @@
+(function () {
+  var lastTime = 0;
+  var vendors = ['webkit', 'moz'];
+  for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
+    window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
+    window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] ||
+      window[vendors[x] + 'CancelRequestAnimationFrame'];
+  }
+
+  if (!window.requestAnimationFrame) {
+    window.requestAnimationFrame = function (callback) {
+      var currTime = new Date().getTime();
+      var timeToCall = Math.max(0, 16 - (currTime - lastTime));
+      var id = window.setTimeout(function () {
+        callback(currTime + timeToCall);
+      },
+      timeToCall);
+      lastTime = currTime + timeToCall;
+      return id;
+    };
+  }
+
+  if (!window.cancelAnimationFrame) {
+    window.cancelAnimationFrame = function (id) {
+      clearTimeout(id);
+    };
+  }
+}());