(DataFlex) Azure Key Vault Get OAuth2 Access Token using Client Credentials

See more Azure Key Vault Examples

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoHttp
    Variant vReq
    Handle hoReq
    Variant vResp
    Handle hoResp
    String sStrRespBody
    Integer iRespStatusCode
    Handle hoJsonResp
    String sTemp1

    Move False To iSuccess

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // ---
    // See RBAC Permissions Required for Azure Key Vault API Using OAuth2 Client Credentials Flow
    // ---

    // You can use OAuth2 client credentials with an Azure App (service principal) that has
    // the required Role-Based Access Control (RBAC) permissions.
    // In this case, it would be service principal with RBAC permissions to administer and manage
    // the key vault.

    // You can create the Azure App (also known as the Service Principal)
    // in the Azure CLI (command line interface) as follows:

    // ----------------------------------------------------------------------
    // az ad sp create-for-rbac --name http://example.com --role Contributor
    // ----------------------------------------------------------------------

    // The argument to --name must be a valid URI that is a verified domain of your 
    // organization or its subdomain.

    // The output of the above "az ad sp create-for-rbac ..." command is JSON such as this:

    // {
    //   "appId": "25ac6e3a-9ac7-42b9-b13e-18644c1de959",
    //   "displayName": "azure-cli-2023-10-14-22-38-15",
    //   "name": "http://example.com",
    //   "password": "f1f2f3f0-52dc-4236-8295-c8a1d6aa393c",
    //   "tenant": "4d8dfd66-68d1-13b0-af5c-b31b4b3d53d"
    // }

    // Save the values in the above JSON.  You'll need it below..

    // You'll also want to add the role of "Key Vault Administrator" to the Service Principal
    // for the particular key vault.

    // ----------------------------------------------------------------------
    // az role assignment create --assignee <Application-ID> --role "Key Vault Administrator" 
    //       --scope /subscriptions/<Subscription-ID>/resourceGroups/<Resource-Group-Name>/providers/Microsoft.KeyVault/vaults/<KeyVault-Name>
    // ----------------------------------------------------------------------

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End
    Get Create (RefClass(cComChilkatHttpRequest)) To hoReq
    If (Not(IsComObjectCreated(hoReq))) Begin
        Send CreateComObject of hoReq
    End

    // Add query params to the request.
    Send ComAddParam To hoReq "grant_type" "client_credentials"

    // Use the service principal's appId
    Send ComAddParam To hoReq "client_id" "25ac6e3a-9ac7-42b9-b13e-18644c1de959"

    // Use the service principal's password.
    Send ComAddParam To hoReq "client_secret" "f1f2f3f0-52dc-4236-8295-c8a1d6aa393c"

    // Note: The resource must match the API for which you're using the access token..
    Send ComAddParam To hoReq "resource" "https://vault.azure.net"

    Get ComSetUrlVar Of hoHttp "tenant" "4d8dfd66-68d1-13b0-af5c-b31b4b3d53d" To iSuccess
    Set ComHttpVerb Of hoReq To "POST"
    Set ComContentType Of hoReq To "application/x-www-form-urlencoded"

    Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
    If (Not(IsComObjectCreated(hoResp))) Begin
        Send CreateComObject of hoResp
    End
    Get pvComObject of hoReq to vReq
    Get pvComObject of hoResp to vResp
    Get ComHttpReq Of hoHttp "https://login.microsoftonline.com/{$tenant}/oauth2/token" vReq vResp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComBodyStr Of hoResp To sStrRespBody
    Get ComStatusCode Of hoResp To iRespStatusCode
    If (iRespStatusCode >= 400) Begin
        Showln "Response Status Code = " iRespStatusCode
        Showln "Response Body:"
        Showln sStrRespBody
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonResp
    If (Not(IsComObjectCreated(hoJsonResp))) Begin
        Send CreateComObject of hoJsonResp
    End
    Get ComLoad Of hoJsonResp sStrRespBody To iSuccess
    Set ComEmitCompact Of hoJsonResp To False
    Get ComEmit Of hoJsonResp To sTemp1
    Showln sTemp1

    // The result is an access token such as the following:

    // {
    //   "token_type": "Bearer",
    //   "expires_in": "3600",
    //   "ext_expires_in": "3600",
    //   "expires_on": "1557864616",
    //   "not_before": "1557860716",
    //   "resource": "https://vault.azure.net",
    //   "access_token": "eyJ0eXAiOiJKV1QiL ... 20UFDDOHEyUg"
    // }

    // If you wish, you can save the token to a file.
    // The access token is generally valid for 1 hour.
    // After 1 hour, you would need to get a new access token in the same way.
    Get ComWriteFile Of hoJsonResp "qa_data/tokens/azureKeyVaultToken.json" To iSuccess


End_Procedure