Adobe I/O IMS Library


The Adobe I/O IMS Library helps interacting with the IMS API as well as creating and invalidating tokens.
To support multiple use cases and environments, there is not a single configuration managed by this library but multiple configurations called _IMS configuration contexts_.
Each configuration context holds configuration data needed to create tokens.
See the _Configuration_ section below.

Installation

To install the Adobe I/O IMS Library, simply use npm:

``sh
npm install @adobe/aio-lib-ims --save
`

Quickstart

Before using the AIO IMS Library you need to create an integration on Adobe Developer Console from where you can the grab the integration details to setup a first configuration context. Let's use an OAuth2 integration as an example:

`js
const { context, getToken, getTokenData } = require('@adobe/aio-lib-ims')

const config = {
redirect_uri: "https://callback.example.org",
client_id: "123456cafebabe",
client_secret: "12345678-cafe-babe-cafe-9999",
scope: "openid"
};
await context.set('example', config, true)

const token = await getToken('example')
const tokenDecoded = getTokenData(token)
`

See the API Documentation for full details.

Configuration

The AIO IMS Library transparently maintains the login configuration and keep
access and refresh tokens for reuse before they expire.

All configuration is stored in a single ims root property.

The library supports maintaining multiple configurations for different use cases.
Each such configuration is stored in its own named object with the ims configuration.
Such a configuration is called an _IMS (configuration) context_ and has a label which allows to refer to the configuration by name.

Here is an example ims configuration

`js
{
ims: {
contexts: {
sample_jwt: {
client_id: "",
client_secret: "XXX",
technical_account_id: "@techacct.adobe.com",
meta_scopes: [
"ent_dataservices_sdk"
],
ims_org_id: "@AdobeOrg",
private_key: "XXX"
},
sample_oauth2: {
redirect_uri: "https://callback.example.com",
client_id: "",
client_secret: "XXX",
scope: "openid AdobeID"
},
}
}
}
`

Running on a Desktop

When running on your local machine the AIO IMS is leveraging the Configuration module for use by aio-cli plugins to load and update the configuration stored in .aio and .env files. The library supports both local and global aio configurations.

Here is an example that relies on the AIO IMS to generate a token from an existing configuration:

`js
const { context, getToken } = require('@adobe/aio-lib-ims')

await context.setCurrent('my-config')
const token = await getToken('my-config')
`

Running in an Adobe I/O Runtime action

**Note that Adobe Developer App Builder applications should not own the responsibility to generate their own IMS access tokens.
We strongly discourage this approach in favor of more secure implementation patterns that are documented in our App Builder Security Guide.**

The AIO IMS Library can also be used in an Adobe I/O Runtime action. In this case the IMS configuration must be set beforehand. The library is relying on the Adobe I/O Cloud State Library to persist the access tokens across action invocations and reduce the number of requests to IMS.

Here is an Adobe I/O Runtime action example that leverages the AIO IMS:

`js
const { context, getToken } = require('@adobe/aio-lib-ims')

function main ({ imsContextConfig, ...params }) {
// the IMS context configuration is passed as an action parameter
// imsContextConfig = { client_id, client_secret, technical_account_id, meta_scopes, ims_org_id, private_key }
await context.set('my_ctx', imsContextConfig)

const token = await getToken('my_ctx')
}
`

A few considerations:

- additional constraints on the charset.
- the namespace must be created via the Adobe Developer Console (follows theamsorg-project(-workspace)? format). Legacy namespaces are not supported.
- the I/O Runtime action name and the context name (used in context.set) must be alphanumerical strings and -, _, . are allowed.

- getToken('my_ctx') will always persist tokens in State regardless of local=true|false was used in context.set.

- tokens are cached for a single I/O Runtime action only, this means that cached tokens can't be retrieved across actions and running getToken in another action with the same context name will regenerate a new token.

IMS Environment

The use of IMS environments is reserved to Adobe use.
For information it is indicated by the env configuration context property and takes one of the values prod and stage.
The default value is prod.
In general, you do not need to deal with this property.

Set Current Context (Advanced)

The default context can be set locally with await context.setCurrent('contextname').
This will write the following configuration to the ims key in the .aio file of the current working directory:

`js
ims {
config: {
current: "contextname"
}
}
`

If running the library in the same working directory, then getToken can be called without passing the contextname:

`js
await context.set('contextname', config, true)
await context.setCurrent('contextname')
const token = await getToken() // generate a token for the config in the 'contextname' context
`

**Please note that context.setCurrent rewrites the local configuration and replaces the default aio CLI OAuth configuration in a desktop environment.
This will break aio commands that run from the same directory.**
You can revert to the original behaviour by executing aio config delete ims.config.current from that directory.

JWT Configuration (Deprecated)

The JWT configuration has been deprecated in favor of the OAuth Server-to-Server Configuration.

JWT (service to service integration) configuration requires the following properties:

| Property | Description |
|--|--|
| client_id | The IMS (Oauth2) Client ID. This is the _API Key_ in the integration overview of the Adobe Developer Console. |
| client_secret | The IMS (OAUth2) Client Secret |
| technical_account_id | The _Technical Account ID_ from the integration overview screen in the Adobe Developer Console
| meta_scopes | An array of meta scope names. These are the labels of one ore more special properties in the sample _JWT payload_. They can be found in the _JWT_ tab of the Adobe Developer Console integration in the _JWT payload_ properties of the form "https:///s/ent_dataservices_sdk": true,. There may be one or more of depending on the services to which the integration is subscribed. The values to list in the meta_scopes property are the last segment of the URL. In the example case, this would be ent_dataservices_sdk.
| ims_org_id | The _Organization ID_ from the integration overview screen in the Adobe Developer Console. |
| private_key | The private key matching any one of the _Public Keys_ of the integration. This can be the private key all in one line as a string, or an array of strings (each element is a line from the key file) See the Setting the Private Key section. |
| passphrase | (_Optional_). The passphrase of the private key. |

$3

For a JWT configuration, your private key is generated in Adobe Developer Console, and is downloaded to your computer when you generate it.

Adobe Developer Console does not keep the private key (only your corresponding public key) so you will have to set the private key that was downloaded manually in your IMS context configuration.

You can set your private key in the config via two ways:

1. Import the private key as a string
2. Set a file reference to the private key

The instructions below assume a private key file called private.key and CONTEXT_NAME is the name of your JWT context.

1. To import your private key as a string:
aio config:set ims.contexts.CONTEXT_NAME.private_key path/to/your/private.key --file
2. To set a file reference to the private key instead:
aio config:set ims.contexts.CONTEXT_NAME.private_key path/to/your/private.key

Note that the path to your private key, if it is a relative path, will be resolved relative to the current working directory.

OAuth2 Configuration

OAuth2 configuration requires the following properties:

| Property | Description |
|--|--|
| client_id | The IMS (Oauth2) Client ID. This is the _API Key_ in the integration overview of the Adobe Developer Console. |
| client_secret | The IMS (OAUth2) Client Secret |
| redirect_uri | The _Default redirect URI_ from the integration overview screen in the Adobe Developer Console. Alternatively, any URI matching one of the _Redirect URI patterns_ may be used. |
| scope | Scopes to assign to the tokens. This is a string of comma separated scope names which depends on the services this integration is subscribed to. Adobe Developer Console does not currently expose the list of scopes defined for OAuth2 integrations, a good list of scopes by service can be found in OAuth 2.0 Scopes. At the very least you may want to enter openid. |

OAuth Server-to-Server Configuration

This configuration is to replace the JWT Configuration.

OAuth Server-to-Server (client credentials grant type) configuration requires the following properties:

| Property| Description|
|--------|--------|
| client_id| The IMS (Oauth2) Client ID. This is the _API Key_ in the integration overview of the Adobe Developer Console.|
| client_secrets| An array of IMS (OAUth2) client secrets|
| technical_account_email| The _Technical Account Email_ from the integration overview screen in the Adobe Developer Console|
| technical_account_id| The _Technical Account ID_ from the integration overview screen in the Adobe Developer Console|
| scopes| Scopes to assign to the tokens. This is an array of strings which depends on the services this integration is subscribed to. The list of scopes defined for the OAuth2 Server-to-Server credential is listed under the Scopes tab for the credential in Adobe Developer Console.|
|ims_org_id|The Organization ID from the integration overview screen in the Adobe Developer Console.|

Token Validation

$3

Validations and invalidations can be cached to improve performance. To use caching, configure a new cache and pass it to the library during initialization:

`js
const { Ims, ValidationCache, getToken} = require('@adobe/aio-lib-ims')

const CACHE_MAX_AGE_MS = 5 60 1000 // 5 minutes
const VALID_CACHE_ENTRIES = 10000
const INVALID_CACHE_ENTRIES = 20000
const cache = new ValidationCache(CACHE_MAX_AGE_MS, VALID_CACHE_ENTRIES, INVALID_CACHE_ENTRIES)
const ims = new Ims('prod', cache)

const token = params.theToken // May be passed via header, parameter, or other input
const imsValidation = await ims.validateToken(token)
if (!imsValidation.valid) {
return new Error('Forbidden: This is not a valid IMS token!') // Next time validateToken() is called with this token, a call to IMS will not be made while the cache is still fresh
}
`

$3

You can validate a token against an allow-list of IMS clients. To use an allow-list, pass your token and an array of IMS clients to validateTokenAllowList():

`js
const { Ims } = require('@adobe/aio-lib-ims')
const ims = new Ims()

const token = params.theToken // May be passed via header, parameter, or other input
const allowList = ['ironmaiden', 'metallica', 'gunsandroses']
const imsValidation = await ims.validateTokenAllowList(token, allowList)
if (!imsValidation.valid) {
return new Error('Forbidden: This client is not allowed!')
}
``

Contributing

Contributions are welcomed! Read the Contributing Guide for more information.

Licensing

This project is licensed under the Apache V2 License. See LICENSE for more information.