# Flask OAuthlib

***

**1. Basic OAuth2 Implementation**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**2. Customizing OAuth2 Configuration**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_BASE_URL'] = 'https://example.com/oauth2/'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://example.com/oauth2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**3. Handling State Parameter**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'

oauth = OAuth2Client(app)

@app.route('/')
def index():
    state = request.args.get('state')
    if state is None:
        return redirect(oauth.authorize_redirect('google'))
    return redirect(url_for('callback', state=state))

@app.route('/callback')
def callback():
    state = request.args.get('state')
    token = oauth.authorize_access_token(state=state)
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**4. Using OAuth2 with Implicit Grant**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = None
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**5. Using OAuth2 with PKCE**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_PKCE_ENABLED'] = True
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**6. Using OAuth2 with Multiple Providers**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = {
    'google': '123456',
    'facebook': 'abcdef'
}
app.config['OAUTH2_CLIENT_SECRET'] = {
    'google': 'abcdef',
    'facebook': '123456'
}
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**7. Using OAuth1 Implementation**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth1Client

app = Flask(__name__)
app.config['OAUTH1_CLIENT_ID'] = '123456'
app.config['OAUTH1_CLIENT_SECRET'] = 'abcdef'
oauth = OAuth1Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('twitter'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://api.twitter.com/1.1/account/verify_credentials.json')
    print(resp.data)
    return redirect(url_for('index'))
```

**8. Using OAuth2 with Authorization Server Discovery**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**9. Using OAuth2 with Dynamic Client Registration**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('example-client'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://example.com/api/v1/users/me')
    print(resp.data)
    return redirect(url_for('index'))
```

**10. Using Refresh Tokens**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_REFRESH_TOKEN'] = '123456'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**11. Using OAuth2 with Scopes**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_SCOPE'] = ['email', 'profile']
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**12. Using OAuth2 with Custom Headers**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_HEADERS'] = {
    'X-Requested-With': 'XMLHttpRequest'
}
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**13. Using OAuth2 with Proxy**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_PROXY'] = {
    'https': 'http://proxy.example.com'
}
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**14. Using OAuth2 with Token Endpoint Auth**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_TOKEN_ENDPOINT_AUTH_METHOD'] =\
    'client_secret_basic'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**15. Using OAuth2 with Implicit Grant without User Consent**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = None
app.config['OAUTH2_GRANT_TYPE'] = 'implicit'
app.config['OAUTH2_ACCESS_TOKEN_EXPIRES_IN'] = 3600
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**16. Using OAuth2 with Explicit PKCE Code Exchange**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_PKCE_ENABLED'] = True
app.config['OAUTH2_PKCE_CODE_EXCHANGE'] = True
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**17. Using OAuth2 with Client Side Flow**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_REDIRECT_URI'] = 'http://localhost:5000/callback'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**18. Using OAuth2 with Private Key**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = None
app.config['OAUTH2_PRIVATE_KEY_PATH'] = 'private_key.pem'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**19. Using OAuth2 with Refresh Token Flow**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_REFRESH_TOKEN_FLOW'] = True
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**20. Using OAuth2 with Authorization Code Flow**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_FLOW'] = 'authorization_code'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**21. Using OAuth2 with Device Flow**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_FLOW'] = 'device'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')
def callback():
    token = oauth.authorize_access_token()
    resp = oauth.get(
        'https://www.googleapis.com/oauth2/v2/userinfo')
    print(resp.data)
    return redirect(url_for('index'))
```

**22. Using OAuth2 with Token Exchange Flow**

```python
from flask import Flask, request, redirect, url_for
from flask_oauthlib.client import OAuth2Client

app = Flask(__name__)
app.config['OAUTH2_CLIENT_ID'] = '123456'
app.config['OAUTH2_CLIENT_SECRET'] = 'abcdef'
app.config['OAUTH2_FLOW'] = 'token_exchange'
oauth = OAuth2Client(app)

@app.route('/')
def index():
    return redirect(oauth.authorize_redirect('google'))

@app.route('/callback')


```