evrim 0.1.0

Simple client for Evrim

Evrim Client

A simple Python client to interact with Evrim's REST API.

Authentication

Evrim's REST API uses JSON Web Tokens (JWT) for authentication. Users can either obtain one using their username and password or use an existing valid JWT.

Username/Password Authentication

Let's start by obtaining a JWT using our username and password. When initializing Evrim, the client will authenticate using the provided url, username, and password and obtain a valid JWT.

from evrim import Evrim
import os

# access env variables
url = os.getenv("EVRIM_URL")
username = os.getenv("EVRIM_USERNAME")
password = os.getenv("EVRIM_PASSWORD")

# authenticate using url, username, and password
client = Evrim(
    url=url
    username=username,
    password=password
)

If this authentication is successful, two tokens are then issued to the user:

• access: Bearer token used in all subsequent requests in the Authorization header
• refresh: Token used to obtain a new access token once it expires

Token Validation

JWTs expire after a certain amount of time. To check if your token is still valid, Evrim provides the validate_token function.

from evrim import Evrim
from time import sleep
import os

# access env variables
url = os.getenv("EVRIM_URL")
username = os.getenv("EVRIM_USERNAME")
password = os.getenv("EVRIM_PASSWORD")

# authenticate using url, username, and password
client = Evrim(
    url=url
    username=username,
    password=password
)

# let some time pas
print("sleeping for 20 seconds ...")
sleep(20)

# check if token still valid
if client.validate_token():
    print("Token is still valid!")

If your token is still valid, this function will return True.

Token Refresh

If your token happens to be no longer valid, there are a few paths forward:

• Obtain a new JWT using set_token
• Refresh your existing token pair with refresh_token

Let's look at both in the example below.

Set New Tokens

You can set a new token pair by simply using the set_token function. This will use your existing username and password to obtain a new token pair.

client.set_token()

This will update the session Authentication header with your fresh access token and set a new refresh token.

Refresh Existing Token

You can also refresh your existing access token using the refresh_token function.

client.refresh_token()

This will updated only the session Authorization header with your fresh access token.

Existing Valid JWT Authentication

We can also authenticate using an existing valid JWT.

from evrim import Evrim
import os

url = os.getenv("EVRIM_URL")
token = os.getenv("EVRIM_TOKEN")
refresh = os.getenv("EVRIM_REFRESH_TOKEN")  # optional but can be used to refresh existing access token

client = Evrim.from_token(
    url=url,
    token=token,
    refresh=refresh  # optional value but helpful!
)

This is will do two things:

• Validate your access token to ensure it is still valid
• If valid, set you session Authorization header with the existing valid access token
• If response is provided, this token will also be set so you can leverage operations like refresh_token.