DataFlex
DataFlex
OAuth2 Token using IdentityServer4 with Client Credentials
See more OAuth2 Examples
Demonstrates how to get an OAuth2 access token using the client credential flow with IdentityServer4.Chilkat DataFlex Downloads
Use ChilkatAx-win32.pkg
Procedure Test
Boolean iSuccess
Handle hoHttp
Variant vResp
Handle hoResp
Handle hoJson
String sTokenEndpoint
Variant vGrantTypes
Handle hoGrantTypes
Integer iClientCredentialsIdx
Variant vReq
Handle hoReq
String sAccessToken
String sTemp1
Integer iTemp1
Move False To iSuccess
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
Get Create (RefClass(cComChilkatHttp)) To hoHttp
If (Not(IsComObjectCreated(hoHttp))) Begin
Send CreateComObject of hoHttp
End
// The first step is to fetch your IdentityServer4's discovery document
// (OpenID Connect defines a discovery mechanism, called OpenID Connect Discovery, where an OpenID server publishes its metadata at a well-known URL,
// typically https://server.com/.well-known/openid-configuration
Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
If (Not(IsComObjectCreated(hoResp))) Begin
Send CreateComObject of hoResp
End
Get pvComObject of hoResp to vResp
Get ComHttpNoBody Of hoHttp "GET" "https://localhost:5000/.well-known/openid-configuration" vResp To iSuccess
If (iSuccess = False) Begin
Get ComLastErrorText Of hoHttp To sTemp1
Showln sTemp1
Procedure_Return
End
Get ComStatusCode Of hoResp To iTemp1
If (iTemp1 <> 200) Begin
Get ComStatusCode Of hoResp To iTemp1
Showln "Received response status code " iTemp1
Showln "Response body containing error text or JSON:"
Get ComBodyStr Of hoResp To sTemp1
Showln sTemp1
Procedure_Return
End
Get Create (RefClass(cComChilkatJsonObject)) To hoJson
If (Not(IsComObjectCreated(hoJson))) Begin
Send CreateComObject of hoJson
End
Get ComBodyStr Of hoResp To sTemp1
Get ComLoad Of hoJson sTemp1 To iSuccess
// We have the discovery document, which contains something like this:
// You can use this online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON
// {
// "issuer": "https://localhost:5000",
// "jwks_uri": "https://localhost:5000/.well-known/openid-configuration/jwks",
// "authorization_endpoint": "https://localhost:5000/connect/authorize",
// "token_endpoint": "https://localhost:5000/connect/token",
// "userinfo_endpoint": "https://localhost:5000/connect/userinfo",
// "end_session_endpoint": "https://localhost:5000/connect/endsession",
// "check_session_iframe": "https://localhost:5000/connect/checksession",
// "revocation_endpoint": "https://localhost:5000/connect/revocation",
// "introspection_endpoint": "https://localhost:5000/connect/introspect",
// "frontchannel_logout_supported": true,
// "frontchannel_logout_session_supported": true,
// "backchannel_logout_supported": true,
// "backchannel_logout_session_supported": true,
// "scopes_supported": [
// "openid",
// "profile",
// "email",
// "MyCompany.profile",
// "MyCompany.Identity.WebApi",
// "MyCompany.TriHub.WebApi",
// "offline_access"
// ],
// "claims_supported": [
// "sub",
// "updated_at",
// "locale",
// "zoneinfo",
// "birthdate",
// "gender",
// "website",
// "profile",
// "preferred_username",
// "nickname",
// "middle_name",
// "given_name",
// "family_name",
// "name",
// "picture",
// "email_verified",
// "email",
// "userId",
// "groups",
// "fullname"
// ],
// "grant_types_supported": [
// "authorization_code",
// "client_credentials",
// "refresh_token",
// "implicit",
// "password"
// ],
// "response_types_supported": [
// "code",
// "token",
// "id_token",
// "id_token token",
// "code id_token",
// "code token",
// "code id_token token"
// ],
// "response_modes_supported": [
// "form_post",
// "query",
// "fragment"
// ],
// "token_endpoint_auth_methods_supported": [
// "client_secret_basic",
// "client_secret_post"
// ],
// "subject_types_supported": [
// "public"
// ],
// "id_token_signing_alg_values_supported": [
// "RS256"
// ],
// "code_challenge_methods_supported": [
// "plain",
// "S256"
// ]
// }
//
// The next steps are to (1) get the token_endpoint,
// and (2) verify that the client_credentials grant type is supported.
Get ComStringOf Of hoJson "token_endpoint" To sTokenEndpoint
Get ComArrayOf Of hoJson "grant_types_supported" To vGrantTypes
If (IsComObject(vGrantTypes)) Begin
Get Create (RefClass(cComChilkatJsonArray)) To hoGrantTypes
Set pvComObject Of hoGrantTypes To vGrantTypes
End
Get ComFindString Of hoGrantTypes "client_credentials" True To iClientCredentialsIdx
Send Destroy of hoGrantTypes
// If clientCredentialsIdx is less then zero (-1) then the "client_credentials" string was not found.
If (iClientCredentialsIdx < 0) Begin
Showln "The client credentials grant type is not supported."
Procedure_Return
End
// Request the access token using our Client ID and Client Secret.
// We're going to duplicate this CURL statement:
// curl --request POST \
// --url '<tokenEndpoint>' \
// --header 'content-type: application/x-www-form-urlencoded' \
// --data 'grant_type=client_credentials&client_id=CLIENT_ID&client_secret=CLIENT_SECRET'
Get Create (RefClass(cComChilkatHttpRequest)) To hoReq
If (Not(IsComObjectCreated(hoReq))) Begin
Send CreateComObject of hoReq
End
Set ComHttpVerb Of hoReq To "POST"
Set ComContentType Of hoReq To "application/x-www-form-urlencoded"
Send ComAddParam To hoReq "grant_type" "client_credentials"
Send ComAddParam To hoReq "client_id" "CLIENT_ID"
Send ComAddParam To hoReq "client_secret" "CLIENT_SECRET" Set ComHttpVerb Of hoReq To "POST"
Get pvComObject of hoReq to vReq
Get pvComObject of hoResp to vResp
Get ComHttpReq Of hoHttp sTokenEndpoint vReq vResp To iSuccess
If (iSuccess = False) Begin
Get ComLastErrorText Of hoHttp To sTemp1
Showln sTemp1
Procedure_Return
End
// Make sure we got a 200 response status code, otherwise it's an error.
Get ComStatusCode Of hoResp To iTemp1
If (iTemp1 <> 200) Begin
Showln "POST to token endpoint failed."
Get ComStatusCode Of hoResp To iTemp1
Showln "Received response status code " iTemp1
Showln "Response body containing error text or JSON:"
Get ComBodyStr Of hoResp To sTemp1
Showln sTemp1
Procedure_Return
End
Get ComBodyStr Of hoResp To sTemp1
Get ComLoad Of hoJson sTemp1 To iSuccess
// Our JSON response should contain this:
// {
// "access_token":"eyJz93a...k4laUWw",
// "token_type":"Bearer",
// "expires_in":86400
// }
// Get the access token:
Get ComStringOf Of hoJson "access_token" To sAccessToken
// The access token is what gets added to "Authorization: Bearer <access_token>"
// for the subsequent REST API calls..
End_Procedure