get_token.py

"""
    Utility to get your access tokens.
    Refer: https://developers.facebook.com/docs/facebook-login/access-tokens/refreshing
"""

import webbrowser

import click
import requests
from requests_oauthlib import OAuth2Session
from requests_oauthlib.compliance_fixes import facebook_compliance_fix

DEFAULT_OAUTH_URL = "https://www.facebook.com/dialog/oauth"
DEFAULT_TOKEN_URL = "https://graph.facebook.com/oauth/access_token"
DEFAULT_REDIRECT_URL = "https://localhost:5000/"


@click.group()
def cli():
    pass


@cli.command(short_help="get long term access token by short token.")
def long_term_token():
    app_id = click.prompt("Please input your app id", type=str)
    app_secret = click.prompt("Please input your app secret", hide_input=True, type=str)
    short_token = click.prompt("Please input your short lived token", type=str)
    click.echo("Begin to exchange long term access token...")

    try:
        resp = requests.get(
            url=DEFAULT_TOKEN_URL,
            params={
                "grant_type": "fb_exchange_token",
                "client_id": app_id,
                "client_secret": app_secret,
                "fb_exchange_token": short_token,
            },
            timeout=5,
        )
        if resp.status_code == 200:
            data = resp.json()
            if "error" in data:
                click.echo(
                    "\nOps. May you input error.\n Info: {}".format(data["error"])
                )
            click.echo(
                "\nYour long term token is: \n{}".format(data.get("access_token", ""))
            )
        else:
            click.echo("\nOps. Response error.\n Info: {}".format(resp.text))
    except Exception as e:
        click.echo("\nOps. Error occurred.\n Info: {}".format(e))


@cli.command(short_help="get app access token by app info.")
def app_token():
    app_id = click.prompt("Please input your app id", type=str)
    app_secret = click.prompt("Please input your app secret", hide_input=True, type=str)
    click.echo("Begin to retrieve app access token...")
    try:
        resp = requests.get(
            url=DEFAULT_TOKEN_URL,
            params={
                "grant_type": "client_credentials",
                "client_id": app_id,
                "client_secret": app_secret,
            },
            timeout=5,
        )
        if resp.status_code == 200:
            data = resp.json()
            if "error" in data:
                click.echo(
                    "\nOps. May you input error.\n Info: {}".format(data["error"])
                )
            click.echo(
                "\nYour app access token is: \n{}".format(data.get("access_token", ""))
            )
        else:
            click.echo("\nOps. Response error.\n Info: {}".format(resp.text))

    except Exception as e:
        click.echo("\nOps. Error occurred.\n Info: {}".format(e))


@cli.command(short_help="get user access token by login.")
def user_access_token():
    app_id = click.prompt("Please input your app id", type=str)
    app_secret = click.prompt("Please input your app secret", hide_input=True, type=str)

    facebook = OAuth2Session(client_id=app_id, redirect_uri=DEFAULT_REDIRECT_URL)
    facebook = facebook_compliance_fix(facebook)

    authorization_url, state = facebook.authorization_url(DEFAULT_OAUTH_URL)

    webbrowser.open(authorization_url)

    response = click.prompt("Please input full callback url", type=str)
    facebook.fetch_token(
        token_url=DEFAULT_TOKEN_URL,
        client_secret=app_secret,
        authorization_response=response,
    )
    click.echo("Your access token is: \n{}".format(facebook.access_token))


if __name__ == "__main__":
    cli()