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

See more Azure Key Vault Examples

Demonstrates how to get an OAuth2 access token using client credentials for an Azure Key Vault resource.

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

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoHttp
    Variant vReq
    Handle hoReq
    Boolean iSuccess
    Variant vResp
    Handle hoResp
    String sStrRespBody
    Integer iRespStatusCode
    Handle hoJsonResp
    String sTemp1
    Boolean bTemp1

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

    // 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
    Get pvComObject of hoReq to vReq
    Get ComPostUrlEncoded Of hoHttp "https://login.microsoftonline.com/{$tenant}/oauth2/token" vReq To vResp
    If (IsComObject(vResp)) Begin
        Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
        Set pvComObject Of hoResp To vResp
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 <> True) 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
        Send Destroy of hoResp
        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

    Send Destroy of hoResp


End_Procedure