Requests - Authentication

This chapter will discuss the types of authentication available in the Requests module.
We are going to discuss the following −
Working of Authentication in HTTP Requests
Basic Authentication
Digest Authentication
OAuth2 Authentication
HTTP authentication is on the server-side asking for some authentication information like username, password when the client requests a URL. This is additional security for the request and the response being exchanged between the client and the server.
From the client-side these additional authentication information i.e. username and password can be sent in the headers, which later on the server side will be validated. The response will be delivered from the server-side only when the authentication is valid.
Requests library has most commonly used authentication in requests.auth, which are Basic Authentication (HTTPBasicAuth) and Digest Authentication (HTTPDigestAuth).
This is the simplest form of providing authentication to the server. To work with basic authentication, we are going to use HTTPBasicAuth class available with requests library.
Here is a working example of how to use it.
import requests
from requests.auth import HTTPBasicAuth
response_data = 
requests.get('httpbin.org/basic-auth/admin/admin123', 
auth = HTTPDigestAuth('admin', 'admin123'))
print(response_data.text)  
We are calling the url, https://httpbin.org/basic-auth/admin/admin123 with user as admin and password as admin123.
So, this URL will not work without authentication, i.e. user and password. Once you give the authentication using the auth param, then only the server will give back the response.
E:\prequests>python makeRequest.py
{
   "authenticated": true,
   "user": "admin"
}

This is another form of authentication available with requests. We are going to make use of HTTPDigestAuth class from requests.
import requests
from requests.auth import HTTPDigestAuth
response_data = 
requests.get('https://httpbin.org/digest-auth/auth/admin/admin123', 
auth = HTTPDigestAuth('admin', 'admin123'))
print(response_data.text)
E:\prequests>python makeRequest.py
{
   "authenticated": true,
   "user": "admin"
}

To use OAuth2 Authentication, we need “requests_oauth2” library. To install “requests_oauth2” do the following −
pip install requests_oauth2

The display in your terminal while installing will be something as shown below −
E:\prequests>pip install requests_oauth2
Collecting requests_oauth2
Downloading https://files.pythonhosted.org/packages/52/dc/01c3c75e6e7341a2c7a9
71d111d7105df230ddb74b5d4e10a3dabb61750c/requests-oauth2-0.3.0.tar.gz
Requirement already satisfied: requests in c:\users\xyz\appdata\local\programs
\python\python37\lib\site-packages (from requests_oauth2) (2.22.0)
Requirement already satisfied: six in c:\users\xyz\appdata\local\programs\pyth
on\python37\lib\site-packages (from requests_oauth2) (1.12.0)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in c:\use
rs\xyz\appdata\local\programs\python\python37\lib\site-packages (from requests
->requests_oauth2) (1.25.3)
Requirement already satisfied: certifi>=2017.4.17 in c:\users\xyz\appdata\loca
l\programs\python\python37\lib\site-packages (from requests->requests_oauth2) (2
019.3.9)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in c:\users\xyz\appdata\l
ocal\programs\python\python37\lib\site-packages (from requests->requests_oauth2)
(3.0.4)
Requirement already satisfied: idna<2.9,>=2.5 in c:\users\xyz\appdata\local\pr
ograms\python\python37\lib\site-packages (from requests->requests_oauth2) (2.8)
Building wheels for collected packages: requests-oauth2
Building wheel for requests-oauth2 (setup.py) ... done
Stored in directory: C:\Users\xyz\AppData\Local\pip\Cache\wheels\90\ef\b4\43
3743cbbc488463491da7df510d41c4e5aa28213caeedd586
Successfully built requests-oauth2

We are done installing “requests-oauth2”. To use the API’s of Google, Twitter we need its consent and the same is done using OAuth2 authentication.
For OAuth2 authentication we will need Client ID and a Secret Key. The details of how to get it, is mentioned on https://developers.google.com/identity/protocols/OAuth2.
Later on, login to Google API Console which is available at  https://console.developers.google.com/and get the client id and secret key.
Here is an example of how to use "requests-oauth2".
import requests
from requests_oauth2.services import GoogleClient
google_auth = GoogleClient(
   client_id="xxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com",
   redirect_uri="http://localhost/auth/success.html",
)
a = google_auth.authorize_url(
   scope=["profile", "email"],
   response_type="code",
)
res = requests.get(a)
print(res.url)
We will not be able to redirect to the URL given, as it needs to login to the Gmail account, but here, you will see from the example, that google_auth works and the authorized URL is given.
E:\prequests>python oauthRequest.py
https://accounts.google.com/o/oauth2/auth?redirect_uri=
http%3A%2F%2Flocalhost%2Fauth%2Fsuccess.html&
client_id=xxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com&
scope=profile+email&response_type=code

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