bookops_worldcat.authorize

This module provides means to authenticate and obtain a WorldCat access token.

WorldcatAccessToken

WorldcatAccessToken(
    key: str,
    secret: str,
    scopes: Union[str, List],
    principal_id: str,
    principal_idns: str,
    agent: str = None,
    timeout: Union[float, Tuple] = None,
)

Requests Worldcat access token. Authenticates and authorizes using Client Credentials Grant. Does not support Explicit Authorization Code and Refresh Token flows. Token with correctly bonded scopes can then be passed into a session of particular web service to authorize requests for resources. More on OCLC's web services authorization: https://www.oclc.org/developer/develop/authentication/oauth/client-credentials-grant.en.html

Parameters:

Name	Type	Description	Default
key	str	your WSKey public client_id	required
secret	str	your WSKey secret	required
scopes	Union[str, List]	request scopes for the access token	required
principal_id	str	principalID (required for read/write endpoints)	required
principal_idns	str	principalIDNS (required for read/write endpoints)	required
agent	str	"User-agent" parameter to be passed in the request header; usage strongly encouraged	None
timeout	Union[float, Tuple]	how long to wait for server to send data before giving up; default value is 3 seconds	None

Examples:

>>> from bookops_worldcat import WorldcatAccessToken
>>> token = WorldcatAccessToken(
        key="my_WSKey_client_id",
        secret="my_WSKey_secret",
        scope="WorldCatMetadataAPI",
        principal_id="your principalID here",
        principal_idns="your principalIDNS here",
        agent="my_app/1.0.0")
>>> token.token_str
"tk_Yebz4BpEp9dAsghA7KpWx6dYD1OZKWBlHjqW"
>>> token.is_expired()
False
>>> token.server_response.json()
{"token_token": "tk_Yebz4BpEp9dAsghA7KpWx6dYD1OZKWBlHjqW",
 "token_type": "bearer",
 "expires_in": "1199",
 "principalID": "",
 "principalIDNS": "",
 "scopes": "WorldCatMetadataAPI",
 "contextInstitutionId": "00001",
 "expires_at": "2020-08-23 18:45:29Z"}
>>> token.server_response.request.headers
{"User-Agent": "my_app/1.0.0",
 "Accept-Encoding": "gzip, deflate",
 "Accept": "application/json",
 "Connection": "keep-alive",
 "Content-Length": "67",
 "Content-Type": "application/x-www-form-urlencoded",
 "Authorization": "Basic encoded_authorization_here="}

Source code in bookops_worldcat\authorize.py

def __init__(
    self,
    key: str,
    secret: str,
    scopes: Union[str, List],
    principal_id: str,
    principal_idns: str,
    agent: str = None,
    timeout: Union[float, Tuple] = None,
):
    """Constructor"""

    self.agent = agent
    self.grant_type = "client_credentials"
    self.key = key
    self.oauth_server = "https://oauth.oclc.org"
    self.principal_id = principal_id
    self.principal_idns = principal_idns
    self.scopes = scopes
    self.secret = secret
    self.server_response = None
    self.timeout = timeout
    self.token_expires_at = None
    self.token_str = None
    self.token_type = None

    # default bookops-worldcat request header
    if self.agent is None:
        self.agent = f"{__title__}/{__version__}"
    else:
        if type(self.agent) is not str:
            raise WorldcatAuthorizationError("Argument 'agent' must be a string.")

    # asure passed arguments are valid
    if not self.key:
        raise WorldcatAuthorizationError("Argument 'key' is required.")
    else:
        if type(self.key) is not str:
            raise WorldcatAuthorizationError("Argument 'key' must be a string.")

    if not self.secret:
        raise WorldcatAuthorizationError("Argument 'secret' is required.")
    else:
        if type(self.secret) is not str:
            raise WorldcatAuthorizationError("Argument 'secret' must be a string.")

    if not self.principal_id:
        raise WorldcatAuthorizationError(
            "Argument 'principal_id' is required for read/write endpoint of Metadata API."
        )
    if not self.principal_idns:
        raise WorldcatAuthorizationError(
            "Argument 'principal_idns' is required for read/write endpoint of Metadata API."
        )

    # validate passed scopes
    if type(self.scopes) is list:
        self.scopes = " ".join(self.scopes)
    elif type(self.scopes) is not str:
        raise WorldcatAuthorizationError(
            "Argument 'scope' must a string or a list."
        )
    self.scopes = self.scopes.strip()
    if self.scopes == "":
        raise WorldcatAuthorizationError("Argument 'scope' is missing.")

    # assign default value for timout
    if not self.timeout:
        self.timeout = (3, 3)

    # initiate request
    self._request_token()

is_expired

is_expired()

Checks if the access token is expired.

Returns:

Type	Description
	bool

Example:

token.is_expired() False

Source code in bookops_worldcat\authorize.py

def is_expired(self):
    """
    Checks if the access token is expired.

    Returns:
        bool

    Example:
    >>> token.is_expired()
    False
    """
    if (
        datetime.strptime(self.token_expires_at, "%Y-%m-%d %H:%M:%SZ")
        < datetime.utcnow()
    ):
        return True
    else:
        return False