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Integrating with API Mediation Layer

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Integrating with API Mediation Layer

Zowe API Mediation Layer (ML) provides a single point of access to a defined set of mainframe services. The layer provides API management features such as high-availability, consistent security, and a single sign-on (SSO) and multi-factor authentication (MFA) experience.

You can access services through API ML without reauthenticating every time you issue a command. Tokens allow for a secure interaction between the client and server. When you issue commands to API ML, the layer routes requests to an appropriate API instance based on system load and available API instances.

How token management works​

When you log in with the CLI, an API ML token is supplied and stored on your computer in place of the username and password. The token allows for a secure handshake with API ML when you issue each command, such that you do not need to reauthenticate until the token expires.

Note: Zowe CLI also supports standard token implementations such as Java Web Tokens (JWT) and Lightweight Third-Party Authentication (LTPA).

Logging in​

To request a token and log in to API ML:

  1. Issue the following command to log in to API ML:

    zowe auth login apiml

  2. When prompted, enter the following information:

    • Username
    • Password (can be a PIN concatenated with a second factor for MFA)
    • Host
    • Port for the API ML instance


    A base profile is created and saved on your PC that contains your token. When you issue commands, you can omit your username, password, host, and port.

    If you do not want to store the token on your PC, append the --show-token option to the login command.

    If you already created a base profile, you might not be prompted for the host and port.

  3. Provide a base path and base profile on commands to connect to API ML.

    If you use the --show-token option with the log-in command, you must manually supply the token on each command using the --token-value option. For example:

    zowe auth login apiml --base-path "ibmzosmf/api/v1" --token-value "123"

Notes:

  • Tokens expire after a period of time defined by your security administrator. When a token expires, you must log in again to get a new token.
  • If you omit connection details from a service profile, such as zosmf profile, the CLI uses the information from your base profile.
  • You can choose to specify all connection details on a service profile and connect directly to the service. Routing through API ML is not required.

Logging out​

Log out to prompt the API ML token to expire and remove it from your base profile.

To log out of the API ML:

zowe auth logout apiml

This causes the token to expire. Log in again to obtain a new token.

Accessing a service through API ML​

To access mainframe services through API ML using the token in your base profile, use the following command options:

  • --base-path: Indicates the base path of the API ML instance that you want to access.

  • --disable-defaults: Prevents default values from being stored in service profiles. If you do not use this flag, the defaults can override values in your base profile.

Note: Ensure that you do not provide username, password, host, or port directly on the service commands or profiles. Supplying those options causes the CLI to ignore the API ML token in your base profile and access the service directly.

Specifying a base path with Zowe V2 profiles​

To specify a base path with Zowe V2 profiles:

  1. Note the complete path for a z/OSMF instance registered to API ML.

    For example:

    https://myapilayerhost:port/ibmzosmf/api/v1

    The format of base path can vary based on how API ML is configured at your site.

  2. Access the API ML instance by creating a service profile (or issuing a command) with the --base-path value of ibmzosmf/api/v1. Your service profile uses the token and credentials stored in your default base profile.

    Using the preceding example, you would issue the following command with your profile name:

    zowe config set "profiles.myapimlprofile.properties.basepath" "ibmzosmf/api/v1"

    Commands issued with this profile are routed through the layer to access an appropriate z/OSMF instance.

Specifying a base path with Zowe V1 profiles​

To specify a base path with Zowe V1 profiles:

  1. Note the complete path for a z/OSMF instance registered to API ML.

    For example:

    https://myapilayerhost:port/ibmzosmf/api/v1

    The format of base path can vary based on how API ML is configured at your site.

  2. Access the API ML instance by creating a service profile (or issuing a command) with the --base-path value of ibmzosmf/api/v1. Your service profile uses the token and credentials stored in your default base profile.

    Using the preceding example, you would issue the following command with your profile name:

    zowe profiles create zosmf myapimlprofile --base-path ibmzosmf/api/v1 --disable-defaults

    Commands issued with this profile are routed through the layer to access an appropriate z/OSMF instance.

Accessing multiple services with SSO​

If multiple services are registered to the API Mediation Layer at your site, Zowe CLI lets you access the services with Single Sign-on (SSO). Log in once to conveniently access all available services.

When you are logged in, supply the --base-path option on commands for each service. Ensure that you do not provide username, password, host, or port directly on your service commands or profiles. Supplying those options causes the CLI to ignore the token in your base profile and directly access the service. You might need to remove those options from existing profiles to use SSO.

For information about registering an API service at your site, see Developing for API Mediation Layer.

Accessing services through SSO and a service not through API ML​

A scenario might exist where you log in to API ML with SSO, but you also want to access a different service directly.

To access the SSO-enabled services, log in and issue commands with the --base-path and --base-profile options. The token from your base profile is used for authentication. Remember, your command or service profile must not contain username, password, host, or port.

To access the other service directly -- and circumvent API ML -- supply all connection information (username, password, host, and port) on a command or service profile. When you explicitly supply username and password in a command or service profile, the CLI always uses that connection information instead of the API ML token.

Accessing services through SSO and a service through API ML but not SSO​

You might want to access multiple services with SSO, but also access a service through API ML that is not SSO-enabled.

To perform SSO for the first set of services, log in to API ML and supply the --base-path and --base-profile on commands. For more information, see Accessing multiple services with SSO.

To access the service that is not SSO-enabled, explicitly provide your username and password when you issue commands. Using the --base-path option ensures that the request is routed to API ML, but the username and password that you provide overrides the credentials in your base profile. This lets you sign in to the individual service.

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