ADUCID 4.x

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====== Identity Link support ======
You can follow these steps to integrate no-code identity link support to your application:
  * Send identity link HTTP request to ADUCID Binder
  * Process authentication on ADUCID Binder
  * Read identity link JSON response
See chapters below for details.

===== Setup =====
At first, identity link must be prepared and sent to ADUCID Binder. ADUCID Binder accepts identity link HTTP requests at ''/aducid-binder/prepareIdentityLinkUpload''. Before ADUCID Binder call, **unique identifier (aka ''identityLinkId'') must be generated**. This identifier is neccessary to successfully pair identity link request and response. Let's see ADUCID Binder identity link interface parameters:
^ Name ^ Values ^ Mandatory ^ Description ^
| identityLinkId | String | Yes | identity link unique identifier |
| remoteAims | List<String> | Yes | list of identity link remote AIMs |
| peigMessage | MultipartFile | No | identity link message in plain or HTML format |
| peigMessageData | MultipartFile | No | identity link message data |
| initLF | Boolean | No | if true, personal code will be initialized |
| redirectUrl | String | Yes | URL to redirect after ADUCID Binder successful authentication |
| errorPage | String | No | URL to redirect after ADUCID Binder unsuccessful authentication |
| udi | String | No | if defined, security attack check is realized |
| request | String | No | if defined, ''syncMyIdentityLinkedUserData'' method is called |
**It is neccessary to add ''identityLinkId'' parameter to ''redirectUrl'' attribute** to successfully pair identity link request and response. If ''errorPage'' is not defined, ''redirectUrl'' is used in case of error. Now we can send prepared request to ''/aducid-binder/prepareIdentityLinkUpload'' and check successful identity link upload (HTTP code 200).

We must also remember to provide generated identity link identifier to web view, e.g. Ajax JSON response or JSP expression language.

===== Identity link itself =====
When identity link data are successfully uploaded, we can start identity link itself. It can be done with use of [[web-integration:client-side|Client API for Web Integration]]. We only need to specify right ADUCID Binder methods to serve identity link:

<code javascript>
aducid.setStartOperationUrl("/aducid-binder/identityLinkJson?identityLinkId=" + response.data);
aducid.setResultOperationUrl("/aducid-binder/identityLinkCheck");
aducid.setProxyUrl("/aducid-binder/proxy");
</code>

Expression ''response.data'' contains unique identity link identifier pushed from backend to view. After identity link run, user is redirected to ''redirectUrl'' value (or to ''errorPage'' if defined and error occurs).

===== Response processing =====
User is now redirected to ''redirectUrl'', where we must process identity link operation result. Operation result is saved in HTTP request attributes. We try to read attribute with prefix ''AAA_ULR_'' with identity link identifier at the end. When value exists, **we must invoke base64 decoding on value** to get readable JSON response.

There is also saved used remote AIM in HTTP attributes. It can be accessed as an attribute with prefix ''AAA_ULR_RA_'' with identity link identifier at the end. This value is saved as it is, it is not base64 encoded.

==== Positive response ====
When identity link was successful (''status = OK''), JSON response will be:

<code javascript>
{
  "status": "OK",
  "data": null,
  "redirect": null
}
</code>

When ''request'' value was used in identity link setup (e.g. ''{"eidProviderMethod":"READ_EID_USER_DATA","data":null}''), ''data'' will be filled in service provider response. For example:

<code javascript>
{
  "status": "OK",
  "data": {
    "firstName": "John",
    "firstNameApproved": true,
    "lastName": "Green",
    "lastNameApproved": true,
    "permanentAddress": "Castle Road 54, Green Town, CF72 2YD",
    "permanentAddressApproved": true,
    "identityCardNumber": "ID97967588",
    "identityCardNumberApproved": true,
    "identityCardValidTo": "2023-05-10",
    "identityCardValidToApproved": true,
    "birthDate": "1971-10-09",
    "birthDateApproved": true,
    "deliveryAddress": "Castle Road 54, Green Town, CF72 2YD",
    "deliveryAddressApproved": true,
    "telephoneNumber": "+44 654 987 987",
    "telephoneNumberApproved": true,
    "voter": true,
    "voterApproved": true,
    "creditCardNumber": "4485 5057 0701 1520",
    "creditCardNumberApproved": true,
    "creditCardValidTo": "09/2022",
    "creditCardValidToApproved": true,
    "creditCardOwner": "John Green",
    "creditCardOwnerApproved": true,
    "gender": "male",
    "genderApproved": true,
    "email": "john.green@test.com",
    "emailApproved": true,
    "approvedLF": true,
    "proofingStatus": "APPROVED"
  },
  "redirect": null
}
</code>

==== Negative response ====
See [[nocode:transactions#negative_response|Transaction support, Negative response]] chapter.
ADUCID 4.x

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