Mytoken Endpoint¶

The mytoken endpoint is one of the most important endpoints of the mytoken server. It is also the most versatile endpoint, offering different ways to obtain new mytokens.

These "ways" are called grant types - types how a mytoken can be granted. The two core grant types are the mytoken grant type and the oidc_flow one, but there are also others. In the following we describe how a mytoken can be obtained from the mytoken endpoint with each of the different grants.

Existing Mytoken¶

An existing mytoken can be used with the mytoken grant type to create a new (sub-)token. This requires a mytoken with the create_mytoken capability.

Mytoken Request - Mytoken Grant¶

To create a new (sub-)mytoken from an existing mytoken the client makes a mytoken request to the mytoken endpoint by adding the following parameters using the application/json or application/x-www-form-urlencoded format in the HTTP request entity-body:

Parameter	Necessity	Description
`oidc_issuer`	OPTIONAL	The issuer url of the OpenID provider
`grant_type`	REQUIRED	MUST be `mytoken`
`mytoken`	REQUIRED	The mytoken used for authentication
`restrictions`	OPTIONAL	A JSON Object defining the restrictions for the new token as defined under Types. MUST be a superset of the restrictions of the used mytoken.
`error_on_restrictions`	OPTIONAL	A bool indicating the behavior if the requested restrictions are not a superset of the original token.
`capabilities`	OPTIONAL	A JSON Array of capabilities for the new token. MUST be a subset of the ‘subtoken_capabilities’ of the used Mytoken.
`subtoken_capabilities`	OPTIONAL	A JSON Array of capabilities. The new mytoken can only create mytokens with these capabilities. MUST be a subset of the ‘subtoken_capabilities’ of the used Mytoken.
`name`	OPTIONAL	A name identifying / describing the new mytoken given by the user / client
`rotation`	OPTIONAL	A rotation object as defined under Types describing the rotation policy for the new mytoken
`response_type`	OPTIONAL; MUST not be used if `max_token_len` is used	Determines the representation of the returned mytoken. Default is `token` (JWT); possible values are `token`, `short_token`, `transfer_code`
`max_token_len`	OPTIONAL; MUST not be used if `response_type` is used	Numeric value indicating the maximum length the returned token is allowed to have; the server uses the parameter to determine the representation of the returned mytoken

Example

POST /api/v0/token/my HTTP/1.1
Host: mytoken.example.com
Content-Type: application/json

{
    "grant_type": "mytoken",
    "mytoken": "eyJhbGcio...",
    "restrictions": [
        {
            "exp": 19829349983,
            "scope": "openid profile"
        }
    ],
    "capabilities": ["AT"],
    "name": "example mytoken",
    "max_token_len": 512
}

Mytoken Response - Mytoken Grant¶

A successful response returns a mytoken as defined under Mytoken Response.

OIDC Flow¶

A mytoken can be created from an OIDC authorization flow. The user then authenticates against the OpenID provider and no other prerequisites (such as an existing mytoken) are required. Since this is the only grant type that enables the server to obtain an OIDC refresh token, this flow has to be done by each user at least once, i.e. the first mytoken has to obtained through this flow.

The mytoken server only supports the authorization code flow. While the server could be extended with additional OIDC flows, the authorization code flow is the one offering the best adaption by providers and also fully satisfies user needs. In particular the device flow is not needed between the mytoken server and the OpenID provider, because the server offers a similar experience between the client and the mytoken server.

Obtaining a mytoken through the oidc_flow grant type requires multiple requests by the client and goes beyond a single request-response.

Authorization Request¶

To start the flow the client makes a request to the mytoken endpoint by adding the following parameters using the application/json or application/x-www-form-urlencoded format in the HTTP request entity-body:

Parameter	Necessity	Description
`oidc_issuer`	REQUIRED	The issuer url of the OpenID provider
`grant_type`	REQUIRED	MUST be `oidc_flow`
`oidc_flow`	REQUIRED	MUST be `authorization_code`
`restrictions`	OPTIONAL	A JSON Object defining the restrictions for the new token as defined under Types. If omitted no restrictions are applied.
`capabilities`	OPTIONAL	A JSON Array of capabilities for the new token. If omitted only the `AT` capability is used.
`subtoken_capabilities`	OPTIONAL	A JSON Array of capabilities. The new mytoken can only create mytokens with these capabilities. If omitted equal to `capabilities`.
`client_type`	OPTIONAL	Either `web` or `native`; default is `native`
`redirect_uri`	REQUIRED iff `client_type` is `web`	The url to which the server redirects after the flow
`name`	OPTIONAL	A name identifying / describing the new mytoken given by the user / client
`rotation`	OPTIONAL	A rotation object as defined under Types describing the rotation policy for the new mytoken
`response_type`	OPTIONAL; MUST not be used if `max_token_len` is used	Determines the representation of the returned mytoken. Default is `token` (JWT); possible values are `token`, `short_token`, `transfer_code`
`max_token_len`	OPTIONAL; MUST not be used if `response_type` is used	Numeric value indicating the maximum length the returned token is allowed to have; the server uses the parameter to determine the representation of the returned mytoken

Example

POST /api/v0/token/my HTTP/1.1
Host: mytoken.example.com
Content-Type: application/json

{
    "grant_type": "oidc_flow",
    "oidc_flow": "authorization_code",
    "oidc_issuer": "https://op.example.org",
    "restrictions": [
        {
            "exp": 19829349983,
            "scope": "openid profile"
        }
    ],
    "capabilities": ["AT"],
    "name": "example mytoken",
    "max_token_len": 512
}

Authorization Response¶

A successful response returns the following parameters using the application/json media type:

Parameter	Necessity	Description
`consent_uri`	REQUIRED	The generated authorization url the client should redirect the user to

If the client_type was native the response can contain the following additional parameters:

Parameter	Necessity	Description
`polling_code`	REQUIRED	A code the client can use to poll for the mytoken; see polling code grant
`expires_in`	REQUIRED	The lifetime of the polling code given in seconds
`interval`	OPTIONAL	The interval given in seconds in which the client should poll; if omitted the client SHOULD use an polling interval of 5 seconds

Example

HTTP/1.1 200 OK
Content-Type: application/json

{
    "consent_uri": "https://mytoken.example.com/c/hdkwls",
    "polling_code": "abcdefgh",
    "expires_in": 300
}

The client MUST redirect the user to the obtained authorization url or show it to the user so that they can open it. Upon opening the authorization url the user is presented a consent screen where they can approve or decline the creation of the mytoken. Users can also make changes to the properties of the mytoken in the consent screen. After acceptance, the user is redirected to the OpenID provider where they have to authenticate. At the end of the authorization code flow the mytoken server obtains an OIDC refresh token and creates the requested mytoken.

In the web flow the mytoken server redirects to the specified redirection url and sets the mytoken in the mytoken cookie. In the native flow the mytoken servers redirects to a page informing the user about the success. The user then should go back to the native application. In between the client polls the mytoken endpoint with the received polling code as described below.

Polling Code¶

Native applications when using the authorization code flow poll the mytoken endpoint to receive the mytoken in the end.

Polling Request¶

A polling request includes the following parameters using the application/json or application/x-www-form-urlencoded format in the HTTP request entity-body:

Parameter	Necessity	Description
`grant_type`	REQUIRED	MUST be `polling_code`
`polling_code`	REQUIRED	The polling code

Example

POST /api/v0/token/my HTTP/1.1
Host: mytoken.example.com
Content-Type: application/json

{
    "grant_type": "polling_code",
    "polling_code": "ghijklmn"
}

Polling Response¶

If the user has approved the grant, the mytoken endpoint responds with a successful response as defined under Mytoken Response; otherwise, it responds with an error, as defined in Section 3.5 of RFC 8628.

Transfer Code¶

A transfer code can be used to exchange the code into the mytoken.

Transfer Request¶

A transfer request includes the following parameters using the application/json or application/x-www-form-urlencoded format in the HTTP request entity-body:

Parameter	Necessity	Description
`grant_type`	REQUIRED	MUST be `transfer_code`
`transfer_code`	REQUIRED	The transfer code

Example

POST /api/v0/token/my HTTP/1.1
Host: mytoken.example.com
Content-Type: application/json

{
    "grant_type": "transfer_code",
    "transfer_code": "ghijklmn"
}

Transfer Response¶

A successful response returns a mytoken as defined under Mytoken Response.

Mytoken Response¶

A successful mytoken response returns the following parameters using the application/json media type:

Parameter	Necessity	Description
`mytoken`	REQUIRED if `mytoken_type` is `token` or `short_token`; Otherwise MUST NOT be used	The issued mytoken
`mytoken_type`	REQUIRED if a short mytoken is returned; otherwise RECOMMENDED	The representation type of the returned mytoken. Can be any of the possible values of the `response_type` request parameter. Default is `token`.
`transfer_code`	REQUIRED if `mytoken_type` is `transfer_code`; otherwise MUST NOT be used	The issued transfer code
`expires_in`	RECOMMENDED	The number of seconds in which the returned mytoken or transfer code expires.
`restrictions`	OPTIONAL	The restrictions object for the returned mytoken
`capabilities`	OPTIONAL	A JSON Array describing the capabilities of the returned mytoken
`subtoken_capabilities`	OPTIONAL	A JSON Array describing the capabilities that a mytoken created from the returned mytoken might have
`rotation`	OPTIONAL	The rotation object for the returned mytoken

Mytoken Example Response

HTTP/1.1 200 OK
Content-Type: application/json

{
    "mytoken": "aBcDeFgH...",
    "mytoken_type": "short_token",
    "expires_in": 1000000,
    "capabilities": ["AT"]
}

Transfer Code Example Response

HTTP/1.1 200 OK
Content-Type: application/json

{
    "transfer_code": "abcdefgh",
    "mytoken_type": "transfer_code",
    "expires_in": 300
}

Last update: August 23, 2022 06:19:07