app/main.py

@@ -0,0 +1,232 @@
+import os
+from flask import Flask, render_template, request, redirect, abort, url_for, session
+import requests
+from datetime import datetime
+from urllib.parse import urlencode
+
+def get_env_variable(var_name):
+    value = os.environ.get(var_name)
+    if not value:
+        raise ValueError(f"Missing required environment variable: {var_name}")
+    return value
+
+app = Flask(__name__)
+
+# Read environment variables outside the route function
+client_id = get_env_variable('CLIENT_ID')
+client_secret = get_env_variable('CLIENT_SECRET')
+redirect_uri = get_env_variable('REDIRECT_URI')
+optional_scopes = get_env_variable('OPTIONAL_SCOPES')
+database_url = get_env_variable('DATABASE_URL')
+secret_key = get_env_variable('APP_SECRET_KEY')
+
+# Set secret key to enable sessions
+app.secret_key = secret_key
+
+# https://www.inoreader.com/oauth2/auth
+AUTH_URL = 'https://github.com/login/oauth/authorize'
+
+@app.route('/')
+def home():
+    if is_logged_in():
+        token_id = session.get('token_id')
+        resp = requests.get(f'{database_url}/token/{token_id}')
+        raise_for_status(resp)
+        resp_json = resp.json()
+        token = resp_json['token']
+
+        user_info = requests.get('https://api.github.com/user', headers={
+            'Authorization': f'Bearer {token.get("access_token")}'
+        }).json()
+
+        last_synced = datetime.fromtimestamp(token.get('updated_at')).strftime('%Y-%m-%d %H:%M:%S')
+        next_sync = datetime.fromtimestamp(token.get('updated_at') + token.get('expiration_seconds')).strftime('%Y-%m-%d %H:%M:%S')
+        return render_template('home.html', 
+                               user_login=user_info.get('login'), 
+                               user_email=user_info.get('email'), # for inoreader it's userName and userEmail
+                               readwise_api_key=token.get('readwise_api_key') or '',
+                               last_synced=last_synced, next_sync=next_sync)
+
+    # Generate a CSRF protection string
+    session['csrf_protection_string'] = os.urandom(16).hex()
+     # Construct the OAuth URL with URL encoding
+    oauth_params = {
+            'client_id': client_id,
+            'redirect_uri': redirect_uri,
+            'response_type': 'code',
+            'scope': optional_scopes,
+            'state': session['csrf_protection_string']
+          }
+        # Use urlencode to properly encode the URL parameters
+    oauth_url = f'{AUTH_URL}?{urlencode(oauth_params)}'
+
+
+    # Pass dynamic variables to the template
+    # return render_template('login.html',oauth_url)
+    return render_template('login.html', oauth_url=oauth_url)
+
+
+
+@app.route('/oauth-redirect')
+def oauth_redirect():
+    auth_code = request.args.get('code')
+    csrf_token = request.args.get('state')
+
+    # Verify the CSRF protection string
+    if csrf_token != session.get('csrf_protection_string'):
+        abort(403, 'Invalid CSRF token. Please try again.')
+
+    # Exchange authorization code for access and refresh tokens
+    # response = requests.post(
+    #     'https://www.inoreader.com/oauth2/token',
+    #     headers={
+    #         'Content-Type': 'application/x-www-form-urlencoded',
+    #     },
+    #     data={
+    #         'code': auth_code,
+    #         'redirect_uri': redirect_uri,
+    #         'client_id': client_id,
+    #         'client_secret': client_secret,
+    #         'scope': '',
+    #         'grant_type': 'authorization_code'
+    #     }
+    # )
+
+    # TEST: Github OAuth - REMOVE
+    response = requests.post(
+        'https://github.com/login/oauth/access_token',
+        headers={
+            'Accept': 'application/json'
+        },
+        data={
+            'code': auth_code,
+            'redirect_uri': redirect_uri,
+            'client_id': client_id,
+            'client_secret': client_secret,
+        }
+    )
+
+    raise_for_status(response)
+
+    token = response.json()
+
+    # TEST: Github OAuth - REMOVE
+    token['refresh_token'] = 'N/A'
+    token['expires_in'] = 3600
+
+    # REPLACE user API call with inoreader API call
+    # https://www.inoreader.com/reader/api/0/user-info
+    user_info = requests.get('https://api.github.com/user', headers={
+        'Authorization': f'Bearer {token.get("access_token")}'
+        }).json()
+
+    # Save tokens for later use
+    token_id = save_token(
+        user_info.get('email'), # for inoreader it's userEmail
+        token.get('access_token'),
+        token.get('refresh_token'),
+        token.get('expires_in')
+    )
+
+    set_session_token_id(token_id)
+    return redirect(url_for('home'))
+
+# logout
+@app.route('/logout', methods=['POST'])
+def logout():
+    token_id = session.get('token_id')
+
+    if not token_id:
+        return redirect(url_for('home'))
+    
+    # remove token_id from session
+    session.pop('token_id', None)
+
+    # response = requests.put(f'{database_url}/token/{token_id}', headers={
+    #     'Content-Type': 'application/json'
+    # }, json={
+    #     'is_logged_in': False
+    # })
+    # response.raise_for_status()
+
+    return redirect(url_for('home'))
+
+@app.route('/readwise', methods=['POST'])
+def submit_readwise_api():
+    token_id = session.get('token_id')
+
+    if not token_id:
+        return redirect(url_for('home'))
+
+    response = requests.put(f'{database_url}/token/{token_id}', headers={
+        'Content-Type': 'application/json'
+    }, json={
+        'readwise_api_key': request.form.get('readwise_api_key')
+    })
+    raise_for_status(response)
+
+    return redirect(url_for('home'))
+
+def is_logged_in():
+    token_id = session.get('token_id')
+    if not token_id:
+        return False
+
+    response = requests.get(f'{database_url}/token/{token_id}')
+    raise_for_status(response)
+    resp_json = response.json()
+    token = resp_json['token']
+
+    return token.get('active', False)
+
+def save_token(email, access_token, refresh_token, expiration_seconds):
+    # check if an active token with this email already exists
+    token_by_email_resp = requests.get(f'{database_url}/token?email={email}')
+    raise_for_status(token_by_email_resp)
+
+    if token_by_email_resp.status_code != 200:
+        response = requests.post(
+            f'{database_url}/token',
+            headers={
+                'Content-Type': 'application/json'
+            },
+            json={
+                'email': email,
+                'access_token': access_token,
+                'refresh_token': refresh_token,
+                'expiration_seconds': expiration_seconds
+            }
+        )
+        raise_for_status(response)
+        return response.json().get('id')
+    else:
+        token_by_email_resp_json = token_by_email_resp.json()
+        token = token_by_email_resp_json['token']
+        response = requests.put(
+            f'{database_url}/token/{token["id"]}',
+            headers={
+                'Content-Type': 'application/json'
+            },
+            json={
+                'access_token': access_token,
+                'refresh_token': refresh_token,
+                'expiration_seconds': expiration_seconds,
+            }
+        )
+        raise_for_status(response)
+        return token['id']
+
+def set_session_token_id(token_id):
+    session['token_id'] = token_id
+
+def raise_for_status(response):
+    if response.status_code not in range(200, 300):
+        msg = None
+        try:
+            msg = response.json().get('error', '')
+        except:
+            msg = response.text
+        raise Exception(f'HTTPError: {response.status_code} \n Message: {msg}')
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', debug=True, port=5000)

app/requirements.txt

@@ -0,0 +1,2 @@
+Flask==3.0.1
+requests==2.31.0