Table of Contents

Preface

This document is a tutorial to describe basic usage of Authlete APIs in order to implement OpenID Connect (OIDC) identity provider server that supports authorization code flow.

Components

In this tutorial, we assume the following components. Note that only Authlete’s consoles and APIs are up and running, while an authorization server (OIDC identity provider) and a resource server don’t actually exist.

Instead you will use curl command to simulate how these servers make API requests to Authlete on receiving authorization requests, token requests and token introspection requests from clients (OIDC relying party).

FODNs for each component are as follows. The authorization server and the client don’t exist as stated above, but their FQDNs are at least needed to explain the OAuth flow.

Component	FQDN
Authlete API	`api.authlete.com`
Authlete Service Owner Console	`so.authlete.com`
Authlete Developer Console	`cd.authlete.com`
Authorization Server	`as.example.com`
Client	`client.example.org`
Resource Server	N/A

Environment setup

Consult instructions “Sign-up to Authlete and Creating a Service“ to create a new Authlete API service and register a client to the service.

In this tutorial, we assume the following properties are generated or specified.

Item	Value
Client ID	Auto-generetad e.g. `12898884596863`
Client Secret	Auto-generated e.g. `-olDIKD9BihRfB8O1JxobUEKBZ7PIV5Z6oaqxAshmoUtUZgB-wjmmxTYDiDV6vM_Mgl267PeNrRftq8cWplvmg`
Client Type	`CONFIDENTIAL`
Redirect URIs	`https://client.example.org/cb/example.com`
Client Authentication Method	`CLIENT_SECRET_BASIC`

Let’s try OIDC authorization code flow using this environment, in the next section.

Walk-through

Here is a sequence diagram in this tutorial. Message numbers in the diagram might help you understand the following steps.

Authorization request from the client to the authorization server

The client makes an OIDC authentication request (authorization request) to the authorization server via user agent (message #2, #3). In this tutorial, let’s suppose the following values are specified as paramters in the request.

Item	Value	Description
client_id	`12898884596863`	Registered client ID
response_type	`code`	A value stating OIDC authorization code flow (when `scope` contains `openid`)
redirect_uri	`https://client.example.org/cb/example.com`	One of registered redirect URIs
scope	`openid`	A value stating this request is OIDC authentication request
nonce	`n-0S6_WzA2Mj`	Nonce value (See 3.1.2.1. Authentication Request - OpenID Connect Core 1.0)

The authorization server is to receive the following content (folded for readability) as HTTP GET query string from the user agent.

redirect_uri=https://client.example.org/cb/example.com
 &response_type=code
 &client_id=12898884596863
 &scope=openid
 &nonce=n-0S6_WzA2Mj

The authorization server is supposed to evaluate these parameters by itself. Typical evaluation rules are shown below. After that, the authorization server is going to process OIDC authorization code flow since the values of scope and response_type are openid and code respectively.

Whether a client associated with the client ID 12898884596863 has been registered to the authorization server. It must be an OIDC relying party because of scope=openid.
Whether the value of the redirect URI https://client.example.org/cb/example.com matches with one of URIs registered to the client
Whether values of other parameters such as response_type, scope are applicable for the client, i.e. permitted for the client to specify in its request

Authlete’s /auth/authorization API does the evaluation process on the authorization server’s behalf. Let’s make a reqeust to this API by acting as the authorization server. In this tutorial, execute curl command as follows (message #4). Make sure to replace <API Key>, <API Secret> and <Client ID> by your own values generated in the previous step.

curl -s -X POST https://api.authlete.com/api/auth/authorization \
-u '<API Key e.g. 10738933707579>:<API Secret e.g. Xg6jVpJCvsaXvy2ks8R5WzjdMYlvQqOym3slDX0wNhQ>' \
-H 'Content-Type: application/json' \
-d '{ "parameters": "redirect_uri=https://client.example.org/cb/example.com&response_type=code&client_id=<Client ID e.g. 12898884596863>&scope=openid&nonce=n-0S6_WzA2Mj" }'

If you are using Windows 10’s bundled curl.exe command via PowerShell, make sure the command is curl.exe instead of curl, escape " characters and use ` to break lines.

curl.exe -s -X POST https://api.authlete.com/api/auth/authorization `
-u '<API Key e.g. 10738933707579>:<API Secret e.g. Xg6jVpJCvsaXvy2ks8R5WzjdMYlvQqOym3slDX0wNhQ>' `
-H 'Content-Type: application/json' `
-d '{\"parameters\" : \"redirect_uri=https://client.example.org/cb/example.com&response_type=code&client_id=<Client ID e.g. 12898884596863>&scope=openid&nonce=n-0S6_WzA2Mj\"}'

If the request is appropriate, Authlete makes the following response (omitted for brevity) (message #5).

{
   "resultMessage" : "[A004001] Authlete has successfully issued a ticket to the service (API Key = 10738933707579) for the authorization request from the client (ID = 12898884596863). [response_type=code, openid=true]"
   "type" : "authorizationResponse",
   "resultCode" : "A004001",
   "client" : { [...] },
   "ticket" : "bi2Kxe2WW5mK_GZ_fDFOpK1bnY6xTy40Ap_8nxf-7AU",
   "action" : "INTERACTION",
   [...]
   "service" : {
      [...]
      "supportedClaims" : [
         [...]
      ],
      "supportedScopes" : [
         [...]
      ],
   }
}

Pay attention to three key/value pairs in the response; resultMessage, action and ticket.

{
   [...]
   "ticket" : "bi2Kxe2WW5mK_GZ_fDFOpK1bnY6xTy40Ap_8nxf-7AU",
   "action" : "INTERACTION",
   "resultMessage" : "[A004001] Authlete has successfully issued a ticket to the service (API Key = 10738933707579) for the authorization request from the client (ID = 12898884596863). [response_type=code, openid=true]",

resultMessage provides human-readable result of the request processing (See also Interpreting Authlete’s result codes). openid=true indicates the request is to be processed in accordance with the OIDC protocol.
action indicates what the authorization server should do next.
ticket is required for the authorization server to make a request to another API in the next step.

Authlete also provides service and client information in the response. The authorization server utilizes them to ask the resource owner if he or she authorizes access for the client to the service.

Actual interaction between the resource owner and the authorization server is out of scope in this tutorial. In most cases, authorization server would authenticate user with some credentials (e.g. ID/password), determine roles and privileges for the user, and ask the user if he or she authorizes to share the authentication result with the client (message #6, #7).

Issuing an authorization code

Let’s assume the auhtorization server reaches the following state after completion of the previous process:

The authorization server has authenticated the resource owner, and determined that an identifier for the resource owner, to be shared with Authlete as a value of subject parameter, is testuser01.
The authorization server has got consent from the resource owner.

The authorization server makes a request to Authlete’s /auth/authorization/issue for issurance of an authorization code. It specifies values of subject and ticket that were a part of the response from /auth/authorization API, as request parameters. Execute curl command as follows (message #8). Make sure to replace <API Key>, <API Secret> and <Ticket> by your own values generated in the previous step.

curl -s -X POST https://api.authlete.com/api/auth/authorization/issue \
-u '<API Key e.g. 10738933707579>:<API Secret e.g. Xg6jVpJCvsaXvy2ks8R5WzjdMYlvQqOym3slDX0wNhQ>' \
-H 'Content-Type: application/json' \
-d '{ "ticket": "<Ticket e.g. bi2Kxe2WW5mK_GZ_fDFOpK1bnY6xTy40Ap_8nxf-7AU>", "subject": "testuser01" }'

If the request is appropriate, Authlete makes the following response (message #9).

{
   "action" : "LOCATION",
   "resultCode" : "A040001",
   "type" : "authorizationIssueResponse",
   "accessTokenDuration" : 0,
   "accessTokenExpiresAt" : 0,
   "resultMessage" : "[A040001] The authorization request was processed successfully.",
   "responseContent" : "https://client.example.org/cb/example.com?code=GrYz5vtk6VaF0jxfnDrB2yvmk4deIrnMkrGT07JdM5U",
   "authorizationCode" : "GrYz5vtk6VaF0jxfnDrB2yvmk4deIrnMkrGT07JdM5U"
}

Pay attention to three key/value pairs in the response; resultMessage, action and responseContent.

resultMessage provides human-readable result of the request processing. (See also Interpreting Authlete’s result codes)
action indicates what the authorization server should do next. The value in this response is LOCATION, which means the authorization server should make a redirection response back to the user agent.
responseContent is supposed to be content of the response from the authorization server.

The authorization server is expected to make the following response (folded for readability) to the user agent (message #10).

HTTP/1.1 302 Found
Location: https://client.example.org/cb/example.com
 ?code=GrYz5vtk6VaF0jxfnDrB2yvmk4deIrnMkrGT07JdM5U

It would be another case where the authorization server determines that it won’t issue tokens to the client due to the result of the previous authentication and confirmation. In that situation the authorization server has to tell the client that the authorization flow is terminated.

Authlete’s /auth/authorization/fail API supports the termination process in terms of messages to be sent to the client, and transfer method for the response.

To summarize, an authentication server usually makes a request to either /auth/authorization/issue or /auth/authorization/fail API depending on result of user authentication and consent.

Token request

Here we assume that the user agent receives the redirection response form the authorization server. It would send the following request (folded for readability) to the client (message #11).

GET /cb/example.com?code=GrYz5vtk6VaF0jxfnDrB2yvmk4deIrnMkrGT07JdM5U HTTP/1.1
Host: client.example.org

The client would extract the value of the code parameter, craft a token request with the value and send it to the authorization server as follows (folded for readability). https://as.example.com/token is the token endpoint URI in this tutorial (message #12).

POST /token HTTP/1.1
Host: as.example.com
Authorization: Basic base64(12898884596863:-olDIKD9BihRfB8O1JxobUEKBZ7PIV5Z6oaqxAshmoUtUZgB-wjmmxTYDiDV6vM_Mgl267PeNrRftq8cWplvmg)
Content-Type: application/x-www-form-urlencoded

grant_type=authorization_code
 &code=GrYz5vtk6VaF0jxfnDrB2yvmk4deIrnMkrGT07JdM5U
 &redirect_uri=https://client.example.org/cb/example.com

The authorization server is supposed to evaluate parameters in the request, make a token response back to the client. In this tutorial, let’s use Authlete’s /auth/token API to evaluate the request and create the response. Execute curl command as follows (message #13). Make sure to replace <API Key>, <API Secret>, <Client ID>, <Client Secret> and <Code> by your own values generated in the previous step.

curl -s -X POST https://api.authlete.com/api/auth/token \
-u '<API Key e.g. 10738933707579>:<API Secret e.g. Xg6jVpJCvsaXvy2ks8R5WzjdMYlvQqOym3slDX0wNhQ>' \
-H 'Content-Type: application/json' \
-d '{ "clientId": "<Client ID e.g. 12898884596863>", "clientSecret": "<Client Secret e.g. -olDIKD9BihRfB8O1JxobUEKBZ7PIV5Z6oaqxAshmoUtUZgB-wjmmxTYDiDV6vM_Mgl267PeNrRftq8cWplvmg>", "parameters": "grant_type=authorization_code&code=<Code e.g. GrYz5vtk6VaF0jxfnDrB2yvmk4deIrnMkrGT07JdM5U>&redirect_uri=https://client.example.org/cb/example.com" }'

If the request is appropriate, Authlete makes the following response (message #14).

{
   "resultMessage" : "[A050001] The token request (grant_type=authorization_code) was processed successfully.",
   "action" : "OK",
   "clientIdAliasUsed" : false,
   "subject" : "testuser01",
   "resultCode" : "A050001",
   "refreshTokenExpiresAt" : 1559288344881,
   "grantType" : "AUTHORIZATION_CODE",
   "accessToken" : "7FfwOnGjVHwxXhs2Wr67XV1-ZhQaoy3ctKcGkLyKxuY",
   "idToken" : "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0dXNlcjAxIiwiYXVkIjpbIjEyODk4ODg0NTk2ODYzIl0sImlzcyI6Imh0dHBzOi8vYXV0aGxldGUuY29tIiwiZXhwIjoxNTU5MTA2ODE1LCJpYXQiOjE1NTkwMjA0MTUsIm5vbmNlIjoibi0wUzZfV3pBMk1qIn0.5uSFMTGnubyvtiExHc9l7HT9UsF8a_Qb0STtWzyclBk",
   "responseContent" : "{\"access_token\":\"7FfwOnGjVHwxXhs2Wr67XV1-ZhQaoy3ctKcGkLyKxuY\",\"refresh_token\":\"T1h7fJ6k55CyipDtXNPbzN8ta3FgAAf4QKjo36OVfIE\",\"scope\":\"openid\",\"id_token\":\"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0dXNlcjAxIiwiYXVkIjpbIjEyODk4ODg0NTk2ODYzIl0sImlzcyI6Imh0dHBzOi8vYXV0aGxldGUuY29tIiwiZXhwIjoxNTU5MTA2ODE1LCJpYXQiOjE1NTkwMjA0MTUsIm5vbmNlIjoibi0wUzZfV3pBMk1qIn0.5uSFMTGnubyvtiExHc9l7HT9UsF8a_Qb0STtWzyclBk\",\"token_type\":\"Bearer\",\"expires_in\":86400}",
   "scopes" : [
      "openid"
   ],
   "accessTokenDuration" : 86400,
   "type" : "tokenResponse",
   "refreshToken" : "T1h7fJ6k55CyipDtXNPbzN8ta3FgAAf4QKjo36OVfIE",
   "accessTokenExpiresAt" : 1558510744881,
   "refreshTokenDuration" : 864000,
   "clientId" : 12898884596863
}

Pay attention to three key/value pairs in the response; resultMessage, action and responseContent.

resultMessage provides human-readable result of the request processing. (See also Interpreting Authlete’s result codes)
action indicates what the authorization server should do next. The value in this response is OK, which means the authorization server should make a token response back to the client.
responseContent is supposed to be content of the response from the authorization server.

The authorization server is expected to make the following response to the client (message #15).

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

{
 "access_token":"7FfwOnGjVHwxXhs2Wr67XV1-ZhQaoy3ctKcGkLyKxuY",
 "refresh_token":"T1h7fJ6k55CyipDtXNPbzN8ta3FgAAf4QKjo36OVfIE",
 "scope":"openid",
 "id_token":"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0dXNlcjAxIiwiYXVkIjpbIjEyODk4ODg0NTk2ODYzIl0sImlzcyI6Imh0dHBzOi8vYXV0aGxldGUuY29tIiwiZXhwIjoxNTU5MTA2ODE1LCJpYXQiOjE1NTkwMjA0MTUsIm5vbmNlIjoibi0wUzZfV3pBMk1qIn0.5uSFMTGnubyvtiExHc9l7HT9UsF8a_Qb0STtWzyclBk",
 "token_type":"Bearer",
 "expires_in":86400
}

Finally, the authorization server successfully created the tokens and provided them to the client. By leveraging Authlete APIs, the authorization server doesn’t need to implement complicated logic to evaluate paramters in authorization / token request, and make appropriate responses for those requests with the correct method.

Decoding ID token

In most cases, the client would decode the value of id_token in the response and verify it. Let’s try to decode the token with Online JWT Verfier.

Online JWT Verfier (https://kjur.github.io/jsrsasign/tool/tool_jwtveri.html)

Open the link above, and paste the value of the id_token to textarea in Step 1. In this tutorial, the value is: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0dXNlcjAxIiwiYXVkIjpbIjEyODk4ODg0NTk2ODYzIl0sImlzcyI6Imh0dHBzOi8vYXV0aGxldGUuY29tIiwiZXhwIjoxNTU5MTA2ODE1LCJpYXQiOjE1NTkwMjA0MTUsIm5vbmNlIjoibi0wUzZfV3pBMk1qIn0.5uSFMTGnubyvtiExHc9l7HT9UsF8a_Qb0STtWzyclBk

Click Just Decode JWT button in Step 3 and see decoded content in Parsed JWT section.

The decoded results are as follows.

Header

{
  "alg": "HS256"
}

Payload

{
  "sub": "testuser01",
  "aud": [
    "12898884596863"
  ],
  "iss": "https://authlete.com",
  "exp": 1559106815,
  "iat": 1559020415,
  "nonce": "n-0S6_WzA2Mj"
}

You will see there are some points need to be improved in this ID Token.

iss is https://authlete.com, which is the default value of Authlete. It must be https://as.example.com, that is the identifier of the authorization server in this tutorial.
sub is the only attribute related to the user’s identity. It may be better to include other user attributes for the client’s convenience.

Let’s fix the iss value and add other claims in the next section.

Modifying ID token

Issuer identifier

Log in to Service Owner Console https://so.authlete.com/accounts/login and select the service previously created during this tutorial. Click “Edit” button in the bottom of the page to make settings editable.

Note that the default value of “Token Issuer Identifier” at Basic tab is https://authlete.com. Change it to https://as.example.com and click “Update” button in the bottom of the page. Press “OK” in a dialog for confirmation.

Now that the Token Issuer Identifier iss has been fixed.

Authorization Request

Let’s make the same authorization request as the previous one (using the same nonce value for convenience) to Authlete’s /auth/authorization API (message #4). Make sure to replace <API Key>, <API Secret> and <Client ID> by your own values generated in the previous step.

curl -s -X POST https://api.authlete.com/api/auth/authorization \
-u '<API Key e.g. 10738933707579>:<API Secret e.g. Xg6jVpJCvsaXvy2ks8R5WzjdMYlvQqOym3slDX0wNhQ>' \
-H 'Content-Type: application/json' \
-d '{ "parameters": "redirect_uri=https://client.example.org/cb/example.com&response_type=code&client_id=<Client ID e.g. 12898884596863>&scope=openid&nonce=n-0S6_WzA2Mj" }'

Then you will receive the following response (omitted for brevity).

{
   [...]
   "action" : "INTERACTION",
   "resultCode" : "A004001",
   "resultMessage" : "[A004001] Authlete has successfully issued a ticket to the service (API Key = 10738933707579) for the authorization request from the client (ID = 12898884596863). [response_type=code, openid=true]",
   "ticket" : "JjQ_Th1UvZyU5MsdKTLIfLv3VlKwEiYnnULmW6l_d9A",
   "type" : "authorizationResponse"
}

Additional claims

Let’s make a request to Authlete’s /auth/authorization/issue for issurance of an authorization code. Make sure to replace <API Key>, <API Secret> and <Ticket> by your own values generated in the previous step.

This time the following additional claims are included on making the request to the API.

Item	Value
`name`	`Test User`
`email`	`testuser01@example.com`
`email_verified`	true

claims is the paramater to add claims. The request will be constructed as follows.

curl -s -X POST https://api.authlete.com/api/auth/authorization/issue \
-u '<API Key e.g. 10738933707579>:<API Secret e.g. Xg6jVpJCvsaXvy2ks8R5WzjdMYlvQqOym3slDX0wNhQ>' \
-H 'Content-Type: application/json' \
-d '{ "ticket": "<Ticket e.g. JjQ_Th1UvZyU5MsdKTLIfLv3VlKwEiYnnULmW6l_d9A>", "subject": "testuser01", "claims": "{\"name\": \"Test User\", \"email\": \"testuser01@example.com\", \"email_verified\": true}" }'

Then you will receive the following response (folded for readability).

{
   "responseContent" : "https://client.example.org/cb/example.com?code=ILePyGjraVgeU_fzaQRfd0gv10pzxgcpHY_vHT2dsPI",
   "accessTokenDuration" : 0,
   "authorizationCode" : "ILePyGjraVgeU_fzaQRfd0gv10pzxgcpHY_vHT2dsPI",
   "accessTokenExpiresAt" : 0,
   "type" : "authorizationIssueResponse",
   "resultMessage" : "[A040001] The authorization request was processed successfully.",
   "resultCode" : "A040001",
   "action" : "LOCATION"
}

We assume the authorization server makes a redirection response to the user agent, and then the user agent makes the following HTTP GET request to the client.

GET /cb/example.com?code=ILePyGjraVgeU_fzaQRfd0gv10pzxgcpHY_vHT2dsPI HTTP/1.1
Host: client.example.org

Token request

The client makes a token request (folded for readability) to the authorization server.

POST /token HTTP/1.1
Host: as.example.com
Authorization: Basic base64(12898884596863:-olDIKD9BihRfB8O1JxobUEKBZ7PIV5Z6oaqxAshmoUtUZgB-wjmmxTYDiDV6vM_Mgl267PeNrRftq8cWplvmg)
Content-Type: application/x-www-form-urlencoded

grant_type=authorization_code
 &code=ILePyGjraVgeU_fzaQRfd0gv10pzxgcpHY_vHT2dsPI
 &redirect_uri=https://client.example.org/cb/example.com

The authorization server is supposed to make a request to Authlete’s /auth/token API. Make sure to replace <API Key>, <API Secret>, <Client ID>, <Client Secret> and <Code> by your own values generated in the previous step.

curl -s -X POST https://api.authlete.com/api/auth/token \
-u '<API Key e.g. 10738933707579>:<API Secret e.g. Xg6jVpJCvsaXvy2ks8R5WzjdMYlvQqOym3slDX0wNhQ>' \
-H 'Content-Type: application/json' \
-d '{ "clientId": "<Client ID e.g. 12898884596863>", "clientSecret": "<Client Secret e.g. -olDIKD9BihRfB8O1JxobUEKBZ7PIV5Z6oaqxAshmoUtUZgB-wjmmxTYDiDV6vM_Mgl267PeNrRftq8cWplvmg>", "parameters": "grant_type=authorization_code&code=<Code e.g. ILePyGjraVgeU_fzaQRfd0gv10pzxgcpHY_vHT2dsPI>&redirect_uri=https://client.example.org/cb/example.com" }'

Authlete makes the following response.

{
   "grantType" : "AUTHORIZATION_CODE",
   "responseContent" : "{\"access_token\":\"R4sd3s02Y1Gj72iI5Md6ZkGapXZ6mSnIEdihTvrM_Ro\",\"refresh_token\":\"k4WqWw2tcDOHxXXo29NxOCwQJyeDOtZ6aw_Y9Ugy-6U\",\"scope\":\"openid\",\"id_token\":\"eyJhbGciOiJIUzI1NiJ9.eyJuYW1lIjoiVGVzdCBVc2VyIiwiZW1haWwiOiJ0ZXN0dXNlcjAxQGV4YW1wbGUuY29tIiwiZW1haWxfdmVyaWZpZWQiOnRydWUsImlzcyI6Imh0dHBzOi8vYXMuZXhhbXBsZS5jb20iLCJzdWIiOiJ0ZXN0dXNlcjAxIiwiYXVkIjpbIjEyODk4ODg0NTk2ODYzIl0sImV4cCI6MTU1OTEzNzMwMSwiaWF0IjoxNTU5MDUwOTAxLCJub25jZSI6Im4tMFM2X1d6QTJNaiJ9.8ngbBoGLUvHXIO4VyGN0-txJfE5Yq86xElMSxqGlLv0\",\"token_type\":\"Bearer\",\"expires_in\":86400}",
   "resultMessage" : "[A050001] The token request (grant_type=authorization_code) was processed successfully.",
   "accessTokenExpiresAt" : 1559115444898,
   "accessToken" : "R4sd3s02Y1Gj72iI5Md6ZkGapXZ6mSnIEdihTvrM_Ro",
   "type" : "tokenResponse",
   "resultCode" : "A050001",
   "scopes" : [
      "openid"
   ],
   "refreshTokenExpiresAt" : 1559893044898,
   "subject" : "testuser01",
   "action" : "OK",
   "refreshTokenDuration" : 864000,
   "accessTokenDuration" : 86400,
   "refreshToken" : "k4WqWw2tcDOHxXXo29NxOCwQJyeDOtZ6aw_Y9Ugy-6U",
   "clientIdAliasUsed" : false,
   "idToken" : "eyJhbGciOiJIUzI1NiJ9.eyJuYW1lIjoiVGVzdCBVc2VyIiwiZW1haWwiOiJ0ZXN0dXNlcjAxQGV4YW1wbGUuY29tIiwiZW1haWxfdmVyaWZpZWQiOnRydWUsImlzcyI6Imh0dHBzOi8vYXMuZXhhbXBsZS5jb20iLCJzdWIiOiJ0ZXN0dXNlcjAxIiwiYXVkIjpbIjEyODk4ODg0NTk2ODYzIl0sImV4cCI6MTU1OTEzNzMwMSwiaWF0IjoxNTU5MDUwOTAxLCJub25jZSI6Im4tMFM2X1d6QTJNaiJ9.8ngbBoGLUvHXIO4VyGN0-txJfE5Yq86xElMSxqGlLv0",
   "clientId" : 12898884596863
}

The authorization server is expected to make the following response to the client (message #15).

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

{
 "access_token":"R4sd3s02Y1Gj72iI5Md6ZkGapXZ6mSnIEdihTvrM_Ro",
 "refresh_token":"k4WqWw2tcDOHxXXo29NxOCwQJyeDOtZ6aw_Y9Ugy-6U",
 "scope":"openid",
 "id_token":"eyJhbGciOiJIUzI1NiJ9.eyJuYW1lIjoiVGVzdCBVc2VyIiwiZW1haWwiOiJ0ZXN0dXNlcjAxQGV4YW1wbGUuY29tIiwiZW1haWxfdmVyaWZpZWQiOnRydWUsImlzcyI6Imh0dHBzOi8vYXMuZXhhbXBsZS5jb20iLCJzdWIiOiJ0ZXN0dXNlcjAxIiwiYXVkIjpbIjEyODk4ODg0NTk2ODYzIl0sImV4cCI6MTU1OTEzNzMwMSwiaWF0IjoxNTU5MDUwOTAxLCJub25jZSI6Im4tMFM2X1d6QTJNaiJ9.8ngbBoGLUvHXIO4VyGN0-txJfE5Yq86xElMSxqGlLv0",
 "token_type":"Bearer",
 "expires_in":86400
}

As the client on receiving the response, let’s try to decode the token with Online JWT Verfier again.

Online JWT Verfier (https://kjur.github.io/jsrsasign/tool/tool_jwtveri.html)

Open the link above, and paste the value of the id_token to textarea in Step 1. In this tutorial, the value is: eyJhbGciOiJIUzI1NiJ9.eyJuYW1lIjoiVGVzdCBVc2VyIiwiZW1haWwiOiJ0ZXN0dXNlcjAxQGV4YW1wbGUuY29tIiwiZW1haWxfdmVyaWZpZWQiOnRydWUsImlzcyI6Imh0dHBzOi8vYXMuZXhhbXBsZS5jb20iLCJzdWIiOiJ0ZXN0dXNlcjAxIiwiYXVkIjpbIjEyODk4ODg0NTk2ODYzIl0sImV4cCI6MTU1OTEzNzMwMSwiaWF0IjoxNTU5MDUwOTAxLCJub25jZSI6Im4tMFM2X1d6QTJNaiJ9.8ngbBoGLUvHXIO4VyGN0-txJfE5Yq86xElMSxqGlLv0

Click Just Decode JWT button in Step 3 and see decoded content in Parsed JWT section.

The decoded results are as follows.

Header

{
  "alg": "HS256"
}

Payload

{
  "name": "Test User",
  "email": "testuser01@example.com",
  "email_verified": true,
  "iss": "https://as.example.com",
  "sub": "testuser01",
  "aud": [
    "12898884596863"
  ],
  "exp": 1559137301,
  "iat": 1559050901,
  "nonce": "n-0S6_WzA2Mj"
}

Now we can confirm the correct iss value exists, and find the additional claims, name, email and email_verified are included as expected.

Conclusion

In this tutorial, we were able to confirm the following two operations using Authlete APIs.

How to use Authlete APIs to implement authorization code flow into authoriazation server (OIDC identity provider)
Fixing issuer identifier and including additional claims

Next steps

Let’s dig deeper on Authlete by playing with the following features.

/auth/authorization/fail API (See Generating error response with “fail” API)
/auth/userinfo API (See Access token verification in Userinfo API)
Token Management API (See OAuth and OpenID Connect - Authlete Knowledge Base)
Authorization server implementations (See Authorization Server Implementation - Getting Started)
Signing an ID token with public key cryptography (See Changing signing key for ID token)

OIDC Basics

Preface

Components

Environment setup

Walk-through

Authorization request from the client to the authorization server

User authentication and confirmation of sharing authentication result

Issuing an authorization code

Token request

Decoding ID token

Modifying ID token

Issuer identifier

Authorization Request

Additional claims

Token request

Conclusion

Next steps