npm package: @govtechsg/singpass-myinfo-oidc-helper
Description: Helper for building a Relying Party to integrate with Singpass OIDC and MyInfo person basic API
Latest version: 9.0.4

# Singpass MyInfo OIDC helper

Use this module to build client applications that can:

- Authenticate users via the Singpass/Corppass OIDC provider
- Retrieve user's MyInfo data via the MyInfo Person-Basic API and Person API

---

## Installation

`npm i @govtechsg/singpass-myinfo-oidc-helper`

---

## Testing your SingPass / MyInfo client setup and secrets

- These tests will allow you to check if your IDs / keys / certs / JWK endpoints/objects
  are correctly setup
- Use `singpass-helper-ndi-ext.spec.ts` to test login and retrieval of tokens
- After logging in use `myinfo.ext.spec.ts` to test retrieval of myinfo data

## MyInfo

---

### MyInfoHelper

Helper to get a V3 MyInfo person.

`import { MyInfo } from "singpass-myinfo-oidc-helper"`

MyInfo.Helper

- `constructor`

| Param                   | Type     | Description                                                                                                                                                              |
| ----------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| attributes              | string[] | Array of user attributes to retrieve from MyInfo. For full list of attributes, see [here](https://public.cloud.myinfo.gov.sg/myinfo/tuo/myinfo-tuo-specs.html)           |
| clientID                | string   | Your app's client ID when you onboarded with MyInfo                                                                                                                      |
| personBasicURL          | string   | The full URL to the MyInfo person basic endpoint. Exposed for lib user to choose between staging, prod, and any mock server                                              |
| singpassEserviceID      | string   | Your app's ID when you onboarded Singpass. Used by MyInfo to check if the NRIC you are trying to retrieve MyInfo data for has recently logged into your app via Singpass |
| keyToDecryptJWE         | string   | Your private key to decrypt MyInfo's JWE payload. The public key has been given to MyInfo during onboarding, for them to encrypt the JWE containing Person Data          |
| certToVerifyJWS         | string   | The public cert from MyInfo as MyInfo payloads are both encrypted with JWE, and signed with JWS                                                                          |
| privateKeyToSignRequest | string   | Used for signing the request to MyInfo server. Needs to be an encrypted PKCS8 private key                                                                                |
| privateKeyPassword      | string   | the password that you used to encrypt privateKeyToSignRequest                                                                                                            |

- `getPersonBasic(uinfin: string, attributes: string[]) => MyInfoComponents.Schemas.PersonBasic` - get basic profile data which excludes CPF and IRAS data in the shape of `MyInfoComponents.Schemas.PersonBasic`
- `constructAuthorizationUrl(state: string, purpose: string, attributes: string[]) => string` - constructs the authorization url with the necessary params for authorising the user to retrieve full person data
- `getToken(authCode: string, state?: string): => TokenResponse` - get access token when presented with a valid authcode obtained from the Authorise API
- `getPerson(accessToken: string, attributes: string[]) => MyInfoComponents.Schemas.Person` - get full person data in the shape of `MyInfoComponents.Schemas.Person`, requires a valid access token obtained from getToken

---

### MyInfoRequest

Usually not needed, for making any other custom requests to MyInfo not covered in our MyInfo helper.

- `constructor`

| Param                   | Type   | Description                                                                               |
| ----------------------- | ------ | ----------------------------------------------------------------------------------------- |
| appId                   | string | Your app's client ID when you onboarded with MyInfo                                       |
| privateKeyToSignRequest | string | Used for signing the request to MyInfo server. Needs to be an encrypted PKCS8 private key |
| privateKeyPassword      | string | the password that you used to encrypt privateKeyToSignRequest                             |

- `get(uri: string, queryParams?: { [key: string]: any }, accessToken?: string)` - make get request to the defined myinfo gov endpoint

    - `queryParams` refer to the query params for the get request
    - `accessToken` will be prefixed with 'Bearer ' and included in the Authorization header, meant for getPerson api which requires an access token obtained from the Token API

- `post(uri: string, params: { [key: string]: any })` - make post request to the defined myinfo gov endpoint

---

### Fake

MyInfo.Fake.FakeMyInfoHelper

Use `getPersonBasic` to get a fake MyInfo basic profile. Use `getPerson` if you want the full profile which includes the financial data from CPF and IRAS.

- `constructor`

| Param      | Type      | Description                                            |
| ---------- | --------- | ------------------------------------------------------ |
| attributes | string[]? | List of MyInfo attributes that this helper will return |

```ts
getPersonBasic({
  archetype: ProfileArchetype;
  userdisplayname?: string;
  race?: MyInfoRaceCode:
  marital?: MyInfoMaritalStatusCode;
  marriagedate?: string;
  divorcedate?: string;
  marriagecertno?: string;
  countryofmarriage?: MyInfoCountryPlaceCode;
  childrenbirthrecords?: ChildrenBirthRecord[];
  childrenoverridemode?: ChildrenOverrideMode;
  residentialstatus?: MyinfoResidentialCode;
  occupationfreeform?: string;
  dob?: string;
  gstvyear?: number;
  gvs?: GVS;
  merdekageneligible?: boolean;
  merdekagenquantum?: number;
  merdekagenmessagecode?: MyinfoMerdekaGenerationMessageCode;
  hdbtype?: MyinfoHDBTypeCode;
  housingtype?: MyinfoHousingTypeCode;
  drivingqdlvalidity?: MyinfoDrivingLicenceValidityCode;
  vehicles?: VehicleDetails[];
  employment?: string;
}) => MyInfoComponents.Schemas.PersonBasic

getPerson({
  archetype: ProfileArchetype;
  userdisplayname?: string;
  race?: MyInfoRaceCode:
  marital?: MyInfoMaritalStatusCode;
  marriagedate?: string;
  divorcedate?: string;
  marriagecertno?: string;
  countryofmarriage?: MyInfoCountryPlaceCode;
  childrenbirthrecords?: ChildrenBirthRecord[];
  childrenoverridemode?: ChildrenOverrideMode;
  residentialstatus?: MyinfoResidentialCode;
  occupationfreeform?: string;
  dob?: string;
  gstvyear?: number;
  gvs?: GVS;
  merdekageneligible?: boolean;
  merdekagenquantum?: number;
  merdekagenmessagecode?: MyinfoMerdekaGenerationMessageCode;
  hdbtype?: MyinfoHDBTypeCode;
  housingtype?: MyinfoHousingTypeCode;
  drivingqdlvalidity?: MyinfoDrivingLicenceValidityCode;
  vehicles?: VehicleDetails[];
  employment?: string;
  cpfcontributionhistoryoverridemode?: OverrideMode;
  cpfcontributions?: CpfContributionHistory[];
  cpfbalances?: CpfBalance;
  noabasic?: NoaBasic;
}) => MyInfoComponents.Schemas.Person
```

- get a fake person data.

- enum MyInfo.Fake.ProfileArchetype
  suitably named profile archetypes to generate different types of fake MyInfo person

---

## Updating Myinfo domains

- Myinfo domains including `MyinfoComponents` and various enums are auto generated via `npm run generate-myinfo-typings '<swagger file>'`
- Swagger file needs to be downloaded from <https://public.cloud.myinfo.gov.sg/myinfo/api/myinfo-kyc-v4.0.html>
    - Note: there are different variants, this is for Government Digital Services which has the person-basic api
- The script will also fetch and generate enums from <https://api.singpass.gov.sg/assets/api-lib/myinfo/downloads/myinfo-api-code-tables.xlsx>

### Folder / file structure of `src/types`

| Path                 | What is does                                                                       |
| -------------------- | ---------------------------------------------------------------------------------- |
| custom/enums         | Custom defined enums in json                                                       |
| custom/person-common | Additional swagger definitions to go into the `PersonCommon` object                |
| generated            | Auto generated enums from `generate-myinfo-typings` script, do not add files here! |

### Help! The swagger file is missing `<insert data item name>`

- Myinfo REST API does not publish every data item
- You will need to manually add its OpenAPI specification in `custom/person-common` then run `npm run generate-myinfo-typings '<swagger file>'`
- An interface will be created and the corresponding data item will be added to the `PersonCommon` object

### Help! `myinfo-api-code-tables.xlsx` is missing `<insert code name>`

- `myinfo-api-code-tables.xlsx` lists general codes only
- More detailed lists can be found at <https://www.singstat.gov.sg/standards/standards-and-classifications>
- If the missing code list can be found in SingStat, update `generate-myinfo-typings` script to import accordingly
- Otherwise
    1. Manually add the enum definition (json) to `custom/enums` folder
        - _Hint: Refer to existing files for format_
    2. Run `npm run generate-myinfo-typings '<swagger file>'`

### Help! `myinfo-api-code-tables.xlsx's <insert code name>` does not match the swagger definition

- Follow the solution above to add enum definition manually
- That enum will overwrite the auto generated enum

---

## Singpass (Pre-NDI)

Helper for integrating with Pre-NDI Singpass OIDC

`import { Singpass } from "singpass-myinfo-oidc-helper"`

Singpass.OidcHelper

- `constructor`

| Param            | Type   | Description                                                                                                |
| ---------------- | ------ | ---------------------------------------------------------------------------------------------------------- |
| authorizationUrl | string | The URL for Singpass /authorize endpoint                                                                   |
| logoutUrl        | string | The URL for Singpass /logout endpoint                                                                      |
| tokenUrl         | string | The URL for Singpass /token endpoint                                                                       |
| clientID         | string | Your app's ID when you onboarded Singpass.                                                                 |
| clientSecret     | string | The client secret. To be sent together with client ID to token endpoint                                    |
| redirectUri      | string | the redirect URL for Singpass to redirect to after user login. Must be whitelisted by SP during onboarding |
| jweDecryptKey    | string | Private key for decrypting the JWT that wraps the token                                                    |
| jwsVerifyKey     | string | Public key for verifying the JWT that wraps the token                                                      |

### Login

- `constructAuthorizationUrl = (state: string, nonce?: string) => string` - constructs the authorization url with the necessary params, including the:

- state (later returned in redirectUri)
- nonce (later returned inside the JWT from token endpoint)

- `getTokens (authCode: string, axiosRequestConfig?: AxiosRequestConfig) => Promise<TokenResponse>` - get back the tokens from SP token endpoint. Outputs TokenResponse, which is the input for getIdTokenPayload
- `refreshTokens (refreshToken: string, axiosRequestConfig?: AxiosRequestConfig) => Promise<TokenResponse>` - get fresh tokens from SP token endpoint. Outputs TokenResponse, which is the input for getIdTokenPayload
- `getIdTokenPayload(tokens: TokenResponse) => Promise<TokenPayload>` - decrypt and verify the JWT. Outputs TokenPayload, which is the input for extractNricAndUuidFromPayload
- `extractNricAndUuidFromPayload(payload: TokenPayload) => { nric: string, uuid: string }` - finally, get the nric and WOG (Whole-of-government) UUID of the user from the ID Token TokenPayload

#### Logout Singpass SSO session

- `logoutOfSession(sessionId: string) => Promise<SessionLogoutResult>`- Log user out of Singpass session, using a valid session id (that is retrieved from Singpass domain cookie)

---

## Singpass (Post-NDI)

Helper for integrating with Post-NDI Singpass OIDC

`import { Singpass } from "singpass-myinfo-oidc-helper"`

Singpass.NdiOidcHelper

- `constructor`

| Param                  | Type                      | Description                                                                                                |
| ---------------------- | ------------------------- | ---------------------------------------------------------------------------------------------------------- |
| oidcConfigUrl          | string                    | The URL for Singpass OIDC configuration details endpoint                                                   |
| clientID               | string                    | Your app's ID when you onboarded Singpass.                                                                 |
| redirectUri            | string                    | the redirect URL for Singpass to redirect to after user login. Must be whitelisted by SP during onboarding |
| jweDecryptKey          | [key object](#key-object) | Object conatining private key for decrypting the JWT that wraps the token                                  |
| clientAssertionSignKey | [key object](#key-object) | Object conatining private key for signing the client assertion provided in the token endpoint request      |

### Login (V3) _deprecated_

- `constructAuthorizationUrl = (params: { state: string; userInfoScope: string[]; nonce?: string; codeVerifier?: string; }) => Promise<string>` - constructs the authorization url with the necessary params, including the:

    - state (later returned in redirectUri)
    - nonce (later returned inside the JWT from token endpoint)

- `getTokens (authCode: string, axiosRequestConfig?: AxiosRequestConfig) => Promise<TokenResponse>` - get back the tokens from SP token endpoint. Outputs TokenResponse, which is the input for getIdTokenPayload
- `getIdTokenPayload(tokens: TokenResponse, overrideDecryptKey?: Key) => Promise<TokenPayload>` - decrypt and verify the JWT. Outputs TokenPayload, which is the input for extractNricAndUuidFromPayload
- `extractNricAndUuidFromPayload(payload: TokenPayload) => { nric: string, uuid: string }` - finally, get the nric and WOG (Whole-of-government) UUID of the user from the ID Token TokenPayload

### Login (V4)

- `constructAuthorizationUrlV2 = (params: { state: string; userInfoScope: string[]; nonce?: string; codeVerifier?: string; }) => Promise<string>` - constructs the authorization url with the necessary params, including the:

    - state (later returned in redirectUri)
    - nonce (later returned inside the JWT from token endpoint)
    - scope (determines the attributes/user data to be fetched from MyInfo)

- `getTokens (authCode: string, axiosRequestConfig?: AxiosRequestConfig) => Promise<TokenResponse>` - get back the tokens from SP token endpoint. Outputs TokenResponse, which is the input for getIdTokenPayload

- `getUserInfo (token: string) => Promise<string>` - using the `access_token` from `getTokens`, retrieve user data, with the response being a JWE token

- `verifyUserInfo (jwe: string) => Promise<object>` - decrypts the userInfo JWE to return user data

---

## Corppass (Pre-NDI)

Helper for integrating with Pre-NDI Corppass OIDC

`import { Corppass } from "singpass-myinfo-oidc-helper"`

Corppass.OidcHelper

- `constructor`

| Param            | Type   | Description                                                                                                |
| ---------------- | ------ | ---------------------------------------------------------------------------------------------------------- |
| authorizationUrl | string | The URL for Corppass /authorize endpoint                                                                   |
| tokenUrl         | string | The URL for Corppass /token endpoint                                                                       |
| clientID         | string | Your app's ID when you onboarded Corppass.                                                                 |
| clientSecret     | string | The client secret. To be sent together with client ID to token endpoint                                    |
| redirectUri      | string | the redirect URL for Corppass to redirect to after user login. Must be whitelisted by SP during onboarding |
| jweDecryptKey    | string | Private key for decrypting the JWT that wraps the token                                                    |
| jwsVerifyKey     | string | Public key for verifying the JWT that wraps the token                                                      |

### Login

- `constructAuthorizationUrl = (state: string, nonce?: string) => string` - constructs the authorization url with the necessary params, including the:

- state (later returned in redirectUri)
- nonce (later returned inside the JWT from token endpoint)

- `getTokens (authCode: string, axiosRequestConfig?: AxiosRequestConfig) => Promise<TokenResponse>` - get back the tokens from token endpoint. Outputs TokenResponse, which is the input for getIdTokenPayload
- `refreshTokens (refreshToken: string, axiosRequestConfig?: AxiosRequestConfig) => Promise<TokenResponse>` - get fresh tokens from SP token endpoint. Outputs TokenResponse, which is the input for getIdTokenPayload
- `getAccessTokenPayload(tokens: TokenResponse) => Promise<AccessTokenPayload>` - decode and verify the JWT. Outputs AccessTokenPayload, which contains the `EntityInfo`, `AuthInfo` and `TPAccessInfo` claims
- `getIdTokenPayload(tokens: TokenResponse, overrideDecryptKey?: Key) => Promise<IdTokenPayload>` - decrypt and verify the JWT. Outputs IdTokenPayload, which is the input for extractInfoFromIdTokenSubject
- `extractInfoFromIdTokenSubject(payload: TokenPayload) => { nric: string, uuid: string, countryCode: string }` - finally, get the nric, system defined UUID and country code of the user from the ID Token TokenPayload

---

## Corppass (Post-NDI)

Helper for integrating with Post-NDI Corppass OIDC

`import { Corppass } from "singpass-myinfo-oidc-helper"`

Corppass.NdiOidcHelper

- `constructor`

| Param                  | Type                      | Description                                                                                                |
| ---------------------- | ------------------------- | ---------------------------------------------------------------------------------------------------------- |
| oidcConfigUrl          | string                    | The URL for Corppass OIDC configuration details endpoint                                                   |
| clientID               | string                    | Your app's ID when you onboarded Corppass.                                                                 |
| redirectUri            | string                    | the redirect URL for Corppass to redirect to after user login. Must be whitelisted by SP during onboarding |
| jweDecryptKey          | [key object](#key-object) | Object conatining private key for decrypting the JWT that wraps the token                                  |
| clientAssertionSignKey | [key object](#key-object) | Object conatining private key for signing the client assertion provided in the token endpoint request      |

### Login

- `constructAuthorizationUrl = (state: string, nonce?: string) => Promise<string>` - constructs the authorization url with the necessary params, including the:

- state (later returned in redirectUri)
- nonce (later returned inside the JWT from token endpoint)

- `getTokens (authCode: string, axiosRequestConfig?: AxiosRequestConfig) => Promise<TokenResponse>` - get back the tokens from token endpoint. Outputs TokenResponse, which is the input for getIdTokenPayload
- `getAccessTokenPayload(tokens: TokenResponse) => Promise<AccessTokenPayload>` - decode and verify the JWT. Outputs AccessTokenPayload, which contains the `EntityInfo`, `AuthInfo` and `TPAccessInfo` claims
- `getIdTokenPayload(tokens: TokenResponse) => Promise<IdTokenPayload>` - decrypt and verify the JWT. Outputs IdTokenPayload, which is the input for extractInfoFromIdTokenSubject
- `extractInfoFromIdTokenSubject(payload: TokenPayload) => { nric: string, uuid: string, countryCode: string }` - finally, get the nric, system defined UUID and country code of the user from the ID Token TokenPayload
- `getAuthorisationInfoTokenPayload(tokens: TokenResponse) => Promise<AuthInfoTokenPayload>` - get authorisation info JWT from authorisation info endpoint. Outputs AuthInfoTokenPayload, which contain roles and params information of user
- `extractActiveAuthResultFromAuthInfoToken(authInfoToken: AuthInfoTokenPayload): Record<string, EserviceAuthResultRow[]>` - get the currently active authorisation information of the user from the authorisation information token payload

---

## Key Object

| Param  | Type   | Description            |
| ------ | ------ | ---------------------- |
| key    | string | contents of key        |
| format | string | format of key provided |
| alg    | string | key algorithm          |