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README
Access Token Provider

This package provides a convenient retrieval mechanism for access tokens. Multiple provider backends, including OAuth2 Resource Owner Password Credentials Grant, file-based token access (e.g. for Kubernetes) and fetching tokens from the environment (e.g. for local testing) are supported; custom provider backends can easily be added.
Examples
import qualified Security.AccessTokenProvider as ATP
retrieveSomeToken :: IO ()
retrieveSomeToken = do
tokenProvider <- ATP.new (AccessTokenName "token-name")
token <- ATP.retrieveAccessToken tokenProvider
print token
Configuration
Configuration is done by setting certain environment variables, depending on the provider.
OAuth2 based token retrieval
The OAuth2 (Resource Owner Password Credentials Grant) provider
expects the ATP_CONF_ROPCG
environment variable to contain a JSON
object as follows:
{
"credentials_directory": "/optional/credentials/directory",
"auth_endpoint": "<OAuth2 authentication endpoint>",
"tokens": {"token-name": {"scopes": ["first-scope", "second-scope"]}}
}
The credentials_directory
setting defaults to the content of the
environment variable CREDENTIALS_DIR
. It is expected to contain the
files user.json
and client.json
, containing the user and client
credentials respectively.
File based token retrieval (e.g. for Kubernetes)
The file based provider expects the ATP_CONF_FILE
environment
variable to contain a JSON object as follows:
{
"tokens": {"token-name": "/some/file/name"}
}
As a short cut, you can simply save a token path directly in the
environment variable TOKEN_FILE
.
Environment based token retrieval (e.g. for testing)
The file based provider expects the ATP_CONF_FIXED
environment
variable to contain a JSON object as follows:
{
"tokens": {"token-name": "some-fixed-token"}
}