Started with the login function and it works more or less :-)

backend/src/app.py

@@ -1,13 +1,51 @@
+import os
 import time
-from flask import Flask
+import flask
 import flask_sqlalchemy
 import flask_praetorian
 import flask_cors
 
-import os
+db = flask_sqlalchemy.SQLAlchemy()
+guard = flask_praetorian.Praetorian()
+cors = flask_cors.CORS()
 
-app = Flask(__name__)
 
+# A generic user model that might be used by an app powered by flask-praetorian
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.Text, unique=True)
+    password = db.Column(db.Text)
+    roles = db.Column(db.Text)
+    is_active = db.Column(db.Boolean, default=True, server_default='true')
+
+    @property
+    def rolenames(self):
+        try:
+            return self.roles.split(',')
+        except Exception:
+            return []
+
+    @classmethod
+    def lookup(cls, username):
+        return cls.query.filter_by(username=username).one_or_none()
+
+    @classmethod
+    def identify(cls, id):
+        return cls.query.get(id)
+
+    @property
+    def identity(self):
+        return self.id
+
+    def is_valid(self):
+        return self.is_active
+
+
+# Initialize flask app for the example
+app = flask.Flask(__name__)
+app.config['SECRET_KEY'] = 'top secret'
+app.config['JWT_ACCESS_LIFESPAN'] = {'hours': 24}
+app.config['JWT_REFRESH_LIFESPAN'] = {'days': 30}
 # Read environment variables
 if "DEBUG" in os.environ and os.environ["DEBUG"] == 'yes':
     debug = True
@@ -22,26 +60,93 @@ if "PORT" in os.environ:
 else:
     port = 5000
 
+# Initialize the flask-praetorian instance for the app
+guard.init_app(app, User)
 
-db = flask_sqlalchemy.SQLAlchemy()
+# Initialize a local database for the example
-guard = flask_praetorian.Praetorian()
+app.config['SQLALCHEMY_DATABASE_URI'] = f"sqlite:///{os.path.join(os.getcwd(), 'database.db')}"
-cors = flask_cors.CORS()
+db.init_app(app)
 
-class User(db.Model):
+# Initializes CORS so that the api_tool can talk to the example app
-    id = db.Column(db.Integer, primary_key=True)
+cors.init_app(app)
-    username = db.Column(db.Text, unique=True)
+
-    password = db.Column(db.Text)
+# Add users for the example
+with app.app_context():
+    db.create_all()
+    if db.session.query(User).filter_by(username='Yasoob').count() < 1:
+        db.session.add(User(
+          username='Yasoob',
+          password=guard.hash_password('strongpassword'),
+          roles='admin'
+            ))
+    db.session.commit()
 
 
-
+# Set up some routes for the example
-@app.route('/')
+@app.route('/api/')
 def home():
-    return "Hello World"
+    return {"Hello": "World"}, 200
+
+  
+@app.route('/api/login', methods=['POST'])
+def login():
+    """
+    Logs a user in by parsing a POST request containing user credentials and
+    issuing a JWT token.
+    .. example::
+       $ curl http://localhost:5000/api/login -X POST \
+         -d '{"username":"Yasoob","password":"strongpassword"}'
+    """
+    req = flask.request.get_json(force=True)
+    username = req.get('username', None)
+    password = req.get('password', None)
+    user = guard.authenticate(username, password)
+    ret = {'access_token': guard.encode_jwt_token(user)}
+    return ret, 200
+
+  
+@app.route('/api/refresh', methods=['POST'])
+def refresh():
+    """
+    Refreshes an existing JWT by creating a new one that is a copy of the old
+    except that it has a refrehsed access expiration.
+    .. example::
+       $ curl http://localhost:5000/api/refresh -X GET \
+         -H "Authorization: Bearer <your_token>"
+    """
+    print("refresh request")
+    old_token = request.get_data()
+    new_token = guard.refresh_jwt_token(old_token)
+    ret = {'access_token': new_token}
+    return ret, 200
+  
+  
+@app.route('/api/protected')
+@flask_praetorian.auth_required
+def protected():
+    """
+    A protected endpoint. The auth_required decorator will require a header
+    containing a valid JWT
+    .. example::
+       $ curl http://localhost:5000/api/protected -X GET \
+         -H "Authorization: Bearer <your_token>"
+    """
+    return {'message': f'protected endpoint (allowed user {flask_praetorian.current_user().username})'}
     
 @app.route('/time')
 def get_current_time():
     return {'time': time.time()}
 
 
+# Run the example
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5000)
+import time 
+from flask import Flask
+import flask_sqlalchemy
+import flask_praetorian
+import flask_cors
+
+
 if __name__ == '__main__':
     app.run(debug=debug, host=host, port=port)

frontend/package-lock.json

@@ -5197,11 +5197,18 @@
       }
     },
     "domhandler": {
-      "version": "2.4.2",
+      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-2.4.2.tgz",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-4.2.0.tgz",
-      "integrity": "sha512-JiK04h0Ht5u/80fdLMCEmV4zkNh2BcoMFBmZ/91WtYZ8qVXSKjiw7fXMgFPnHcSZgOo3XdinHvmnDUeMf5R4wA==",
+      "integrity": "sha512-zk7sgt970kzPks2Bf+dwT/PLzghLnsivb9CcxkvR8Mzr66Olr0Ofd8neSbglHJHaHa2MadfoSdNlKYAaafmWfA==",
       "requires": {
-        "domelementtype": "1"
+        "domelementtype": "^2.2.0"
+      },
+      "dependencies": {
+        "domelementtype": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.2.0.tgz",
+          "integrity": "sha512-DtBMo82pv1dFtUmHyr48beiuq792Sxohr+8Hm9zoxklYPfa6n0Z3Byjj2IV7bmr2IyqClnqEQhfgHJJ5QF0R5A=="
+        }
       }
     },
     "domutils": {
@@ -7330,22 +7337,40 @@
       }
     },
     "htmlparser2": {
-      "version": "3.10.1",
+      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-3.10.1.tgz",
+      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-6.1.0.tgz",
-      "integrity": "sha512-IgieNijUMbkDovyoKObU1DUhm1iwNYE/fuifEoEHfd1oZKZDaONBSkal7Y01shxsM49R4XaMdGez3WnF9UfiCQ==",
+      "integrity": "sha512-gyyPk6rgonLFEDGoeRgQNaEUvdJ4ktTmmUh/h2t7s+M8oPpIPxgNACWa+6ESR57kXstwqPiCut0V8NRpcwgU7A==",
       "requires": {
-        "domelementtype": "^1.3.1",
+        "domelementtype": "^2.0.1",
-        "domhandler": "^2.3.0",
+        "domhandler": "^4.0.0",
-        "domutils": "^1.5.1",
+        "domutils": "^2.5.2",
-        "entities": "^1.1.1",
+        "entities": "^2.0.0"
-        "inherits": "^2.0.1",
-        "readable-stream": "^3.1.1"
       },
       "dependencies": {
-        "entities": {
+        "dom-serializer": {
-          "version": "1.1.2",
+          "version": "1.3.2",
-          "resolved": "https://registry.npmjs.org/entities/-/entities-1.1.2.tgz",
+          "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.3.2.tgz",
-          "integrity": "sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w=="
+          "integrity": "sha512-5c54Bk5Dw4qAxNOI1pFEizPSjVsx5+bpJKmL2kPn8JhBUq2q09tTCa3mjijun2NfK78NMouDYNMBkOrPZiS+ig==",
+          "requires": {
+            "domelementtype": "^2.0.1",
+            "domhandler": "^4.2.0",
+            "entities": "^2.0.0"
+          }
+        },
+        "domelementtype": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.2.0.tgz",
+          "integrity": "sha512-DtBMo82pv1dFtUmHyr48beiuq792Sxohr+8Hm9zoxklYPfa6n0Z3Byjj2IV7bmr2IyqClnqEQhfgHJJ5QF0R5A=="
+        },
+        "domutils": {
+          "version": "2.7.0",
+          "resolved": "https://registry.npmjs.org/domutils/-/domutils-2.7.0.tgz",
+          "integrity": "sha512-8eaHa17IwJUPAiB+SoTYBo5mCdeMgdcAoXJ59m6DT1vw+5iLS3gNoqYaRowaBKtGVrOF1Jz4yDTgYKLK2kvfJg==",
+          "requires": {
+            "dom-serializer": "^1.0.1",
+            "domelementtype": "^2.2.0",
+            "domhandler": "^4.2.0"
+          }
         }
       }
     },
@@ -12887,9 +12912,9 @@
       "integrity": "sha1-AerA/jta9xoqbAL+q7jB/vfgDqs="
     },
     "postcss": {
-      "version": "7.0.35",
+      "version": "7.0.36",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.35.tgz",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.36.tgz",
-      "integrity": "sha512-3QT8bBJeX/S5zKTTjTCIjRF3If4avAT6kqxcASlTWEtAFCb9NH0OUxNDfgZSWdP5fJnBYCMEWkIFfWeugjzYMg==",
+      "integrity": "sha512-BebJSIUMwJHRH0HAQoxN4u1CN86glsrwsW0q7T+/m44eXOUAxSNdHRkNZPYz5vVUbg17hFgOQDE7fZk7li3pZw==",
       "requires": {
         "chalk": "^2.4.2",
         "source-map": "^0.6.1",
@@ -14415,6 +14440,11 @@
         "workbox-webpack-plugin": "5.1.4"
       }
     },
+    "react-token-auth": {
+      "version": "1.1.8",
+      "resolved": "https://registry.npmjs.org/react-token-auth/-/react-token-auth-1.1.8.tgz",
+      "integrity": "sha512-stS7VbLu57qTC4H2R0Cd7nxuhXeQ2oR3oanXf+sX46BTq6N3ecKfmgTDnfJ0ce+QNX4tWUSbgqMzEPDbkmp7KA=="
+    },
     "read-pkg": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-2.0.0.tgz",
@@ -14628,15 +14658,15 @@
       "integrity": "sha1-wkvOKig62tW8P1jg1IJJuSN52O8="
     },
     "renderkid": {
-      "version": "2.0.5",
+      "version": "2.0.7",
-      "resolved": "https://registry.npmjs.org/renderkid/-/renderkid-2.0.5.tgz",
+      "resolved": "https://registry.npmjs.org/renderkid/-/renderkid-2.0.7.tgz",
-      "integrity": "sha512-ccqoLg+HLOHq1vdfYNm4TBeaCDIi1FLt3wGojTDSvdewUv65oTmI3cnT2E4hRjl1gzKZIPK+KZrXzlUYKnR+vQ==",
+      "integrity": "sha512-oCcFyxaMrKsKcTY59qnCAtmDVSLfPbrv6A3tVbPdFMMrv5jaK10V6m40cKsoPNhAqN6rmHW9sswW4o3ruSrwUQ==",
       "requires": {
-        "css-select": "^2.0.2",
+        "css-select": "^4.1.3",
-        "dom-converter": "^0.2",
+        "dom-converter": "^0.2.0",
-        "htmlparser2": "^3.10.1",
+        "htmlparser2": "^6.1.0",
-        "lodash": "^4.17.20",
+        "lodash": "^4.17.21",
-        "strip-ansi": "^3.0.0"
+        "strip-ansi": "^3.0.1"
       },
       "dependencies": {
         "ansi-regex": {
@@ -14644,6 +14674,56 @@
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
           "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
         },
+        "css-select": {
+          "version": "4.1.3",
+          "resolved": "https://registry.npmjs.org/css-select/-/css-select-4.1.3.tgz",
+          "integrity": "sha512-gT3wBNd9Nj49rAbmtFHj1cljIAOLYSX1nZ8CB7TBO3INYckygm5B7LISU/szY//YmdiSLbJvDLOx9VnMVpMBxA==",
+          "requires": {
+            "boolbase": "^1.0.0",
+            "css-what": "^5.0.0",
+            "domhandler": "^4.2.0",
+            "domutils": "^2.6.0",
+            "nth-check": "^2.0.0"
+          }
+        },
+        "css-what": {
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/css-what/-/css-what-5.0.1.tgz",
+          "integrity": "sha512-FYDTSHb/7KXsWICVsxdmiExPjCfRC4qRFBdVwv7Ax9hMnvMmEjP9RfxTEZ3qPZGmADDn2vAKSo9UcN1jKVYscg=="
+        },
+        "dom-serializer": {
+          "version": "1.3.2",
+          "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.3.2.tgz",
+          "integrity": "sha512-5c54Bk5Dw4qAxNOI1pFEizPSjVsx5+bpJKmL2kPn8JhBUq2q09tTCa3mjijun2NfK78NMouDYNMBkOrPZiS+ig==",
+          "requires": {
+            "domelementtype": "^2.0.1",
+            "domhandler": "^4.2.0",
+            "entities": "^2.0.0"
+          }
+        },
+        "domelementtype": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.2.0.tgz",
+          "integrity": "sha512-DtBMo82pv1dFtUmHyr48beiuq792Sxohr+8Hm9zoxklYPfa6n0Z3Byjj2IV7bmr2IyqClnqEQhfgHJJ5QF0R5A=="
+        },
+        "domutils": {
+          "version": "2.7.0",
+          "resolved": "https://registry.npmjs.org/domutils/-/domutils-2.7.0.tgz",
+          "integrity": "sha512-8eaHa17IwJUPAiB+SoTYBo5mCdeMgdcAoXJ59m6DT1vw+5iLS3gNoqYaRowaBKtGVrOF1Jz4yDTgYKLK2kvfJg==",
+          "requires": {
+            "dom-serializer": "^1.0.1",
+            "domelementtype": "^2.2.0",
+            "domhandler": "^4.2.0"
+          }
+        },
+        "nth-check": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/nth-check/-/nth-check-2.0.0.tgz",
+          "integrity": "sha512-i4sc/Kj8htBrAiH1viZ0TgU8Y5XqCaV/FziYK6TBczxmeKm3AEFWqqF3195yKudrarqy7Zu80Ra5dobFjn9X/Q==",
+          "requires": {
+            "boolbase": "^1.0.0"
+          }
+        },
         "strip-ansi": {
           "version": "3.0.1",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",

frontend/package.json

@@ -13,6 +13,7 @@
     "react-dom": "^17.0.2",
     "react-router-dom": "^5.2.0",
     "react-scripts": "4.0.3",
+    "react-token-auth": "^1.1.8",
     "web-vitals": "^1.1.1"
   },
   "scripts": {

frontend/src/auth/AuthProvider.js

@@ -0,0 +1,11 @@
+import { createAuthProvider } from "react-token-auth";
+
+export const [useAuth, authFetch, login, logout] = 
+createAuthProvider({
+  accessTokenKey: 'access_token',
+  onUpdateToken: (token) => fetch('/api/refresh', {
+    method: 'POST',
+    body: token.access_token
+  })
+  .then(r => r.json())
+})

frontend/src/components/InputField.js

@@ -5,7 +5,7 @@ function InputField(props) {
   return (
     <label className="input-field">
       <p>{props.LabelName}</p>
-      <input name={props.InputName} type={props.InputType} />
+      <input name={props.InputName} onChange={props.onChange} type={props.InputType} />
     </label>
   );
 }

frontend/src/components/SubmitField.js

@@ -6,7 +6,7 @@ function SubmitField(props) {
   const InputValue = props.LabelName;
   return (
     <label className="input-field" className="btn btn--primary btn--medium">
-      <input type="submit" value={InputValue} />
+      <input type="submit" onClick={props.onClick} value={InputValue} />
     </label>
   );
 }

frontend/src/components/pages/Home.js

@@ -2,6 +2,7 @@ import React from "react";
 import "../../App.css";
 import HeroSection from "../HeroSection";
 import Footer from "../../Footer";
+import { useEffect } from "react/cjs/react.development";
 
 function Home() {
   return (

frontend/src/components/pages/Login.js

@@ -1,28 +1,72 @@
 import React from "react";
+import { useState, useEffect } from "react/cjs/react.development";
 import "../../App.css";
 import Footer from "../../Footer";
 import InputField from "../InputField";
 import SubmitField from "../SubmitField";
+import { login, useAuth, logout } from "../../auth/AuthProvider";
 
 export default function Login() {
+  const [username, setUsername] = useState("");
+  const [password, setPassword] = useState("");
+
+  const onSubmitClick = (e) => {
+    e.preventDefault();
+    console.log("You pressed login");
+    let opts = {
+      username: username,
+      password: password,
+    };
+    console.log(opts);
+    fetch("/api/login", {
+      method: "post",
+      body: JSON.stringify(opts),
+    })
+      .then((r) => r.json())
+      .then((token) => {
+        if (token.access_token) {
+          login(token);
+          console.log(token);
+        } else {
+          console.log("Please type in the correct username / password");
+        }
+      });
+  };
+
+  const handleUsernameChange = (e) => {
+    setUsername(e.target.value);
+  };
+
+  const handlePasswordChange = (e) => {
+    setPassword(e.target.value);
+  };
+
+  const [logged] = useAuth();
+
   return (
     <>
       <div className="sitePage">
         <h1>Login</h1>
-        <form>
+        {!logged ? (
+          <form action="#">
             <InputField
               LabelName="Benutzername / Kennung"
-            InputType=""
+              onChange={handleUsernameChange}
+              InputType="text"
               InputName="username"
             />
             <InputField
               LabelName="Passwort"
               InputType="password"
+              onChange={handlePasswordChange}
               InputName="password"
             />
             <br />
-          <SubmitField LabelName="Einloggen" />
+            <SubmitField onClick={onSubmitClick} LabelName="Einloggen" />
           </form>
+        ) : (
+          <button onClick={() => logout()}>Logout</button>
+        )}
       </div>
       <Footer />
     </>