在 C++ 中使用商務邏輯限定存取

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06/13/2023

使用商務規則腳本來提供執行時間邏輯來檢查存取權。如需商務規則的詳細資訊，請參閱商務規則。

若要將商務規則指派給工作，請先設定代表工作的IAzTask物件的BizRuleLanguage屬性。腳本必須位於 Visual Basic Scripting Edition 或 JScript 中。指定指令碼語言之後，請使用腳本的字串表示來設定IAzTask物件的BizRule屬性。

檢查具有相關聯商務規則之工作所包含的作業存取權時，應用程式必須建立兩個大小相同的陣列，以作為IAzClientCoNtext：：AccessCheck方法的varParameterNames和varParameterValues參數傳遞。如需建立用戶端內容的相關資訊，請參閱在 C++ 中使用授權管理員建立用戶端內容。

IAzClientCoNtext：：AccessCheck方法會建立傳遞至商務規則腳本的AzBizRuleCoNtext物件。然後腳本會設定AzBizRuleCoNtext物件的BusinessRuleResult屬性。 TRUE值表示已授與存取權，而FALSE值表示拒絕存取。

商務規則腳本無法指派給委派的IAzScope 物件所包含的 IAzTask物件。

下列範例示範如何使用商務規則腳本來檢查用戶端對作業的存取權。此範例假設磁片磁碟機 C 根目錄中有名為 MyStore.xml 的現有 XML 原則存放區，此存放區包含名為 Expense 的應用程式、名為 Submit Expense 的工作，以及名為 UseFormControl 的作業，而變數 hToken 包含有效的用戶端權杖。

#include <windows.h>
#include <stdio.h>
#include <azroles.h>

void CheckAccess(ULONGLONG hToken)
//  Void CheckAccess().
{
    IAzAuthorizationStore* pStore = NULL;
    IAzApplication* pApp = NULL;
    IAzClientContext* pClientContext = NULL;
    IAzOperation* pOperation = NULL;
    IAzTask* pTask = NULL;
    BSTR storeName = NULL;
    BSTR appName = NULL;
    BSTR operationName = NULL;
    BSTR objectName = NULL;
    BSTR taskName = NULL;
    BSTR bizRule = NULL;
    BSTR bizRuleLanguage = NULL;
    LONG operationID;
    HRESULT hr;
    VARIANT varOperationIdArray;
    VARIANT varOperationId;
    VARIANT varResultsArray;
    VARIANT varResult;
    VARIANT varParamName;
    VARIANT varParamValue;
    VARIANT nameString;
    VARIANT expenseAmount;
    void MyHandleError(char *s);

    VARIANT myVar;
    VariantInit(&myVar);

    //  Initialize COM.
    hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not initialize COM.");

    //  Create the AzAuthorizationStore object.
    hr = CoCreateInstance(
   /*"b2bcff59-a757-4b0b-a1bc-ea69981da69e"*/
         __uuidof(AzAuthorizationStore),
         NULL,
         CLSCTX_ALL,
   /*"edbd9ca9-9b82-4f6a-9e8b-98301e450f14"*/
         __uuidof(IAzAuthorizationStore),
         (void**)&pStore);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not create AzAuthorizationStore object.");

    //  Allocate a string for the policy store.
    if(!(storeName = SysAllocString(L"msxml://c:\\MyStore.xml")))
        MyHandleError("Could not allocate string.");
    
    //  Initialize the store.
    hr = pStore->Initialize(0, storeName, myVar);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not initialize store.");

    //  Create an application object.
    if (!(appName = SysAllocString(L"Expense")))
        MyHandleError("Could not allocate application name string.");
    hr = pStore->OpenApplication(appName, myVar, &pApp);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not open application.");

    //  Create a client context from a token handle.
    hr = pApp->InitializeClientContextFromToken(hToken, myVar,
          &pClientContext);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not create client context.");

    //  Create a business rule for the Submit Expense task.

    //  Open the Submit Expense task.
    if(!(taskName = SysAllocString(L"Submit Expense")))
        MyHandleError("Could not allocate task name string.");
    hr = pApp->OpenTask(taskName, myVar, &pTask);

    //  Assign a business rule to the task.

    //  Set the business rule language to VBScript.
    if(!(bizRuleLanguage = SysAllocString(L"VBScript")))
        MyHandleError("Could not allocate business rule language string.");
    hr = pTask->put_BizRuleLanguage(bizRuleLanguage);
    if(!(SUCCEEDED(hr)))
        MyHandleError("Could not allocate business rule language string.");

    //  Create a BSTR with the business rule code.
    if(!(bizRule = SysAllocString(
        L"Dim Amount \n"
        L"AzBizRuleContext.BusinessRuleResult = FALSE \n"
        L"Amount = AzBizRuleContext.GetParameter(\"ExpAmount\") \n"
        L"if Amount < 500 then AzBizRuleContext.BusinessRuleResult = TRUE"
        )))
         MyHandleError("Could not allocate business rule string.");

    
    hr = pTask->put_BizRule(bizRule);
    if(!(SUCCEEDED(hr)))
        MyHandleError("Could not assign business rule.");

    //  Save the new task data to the store.
    hr = pTask->Submit(0, myVar);
    if(!(SUCCEEDED(hr)))
        MyHandleError("Could not save task data.");

    //  Set up parameters for access check.

    //  Set up the object name.
    if (!(operationName = SysAllocString(L"UseFormControl")))
        MyHandleError("Could not allocate operation name string.");

    //  Get the ID of the operation to check.
    hr = pApp->OpenOperation(operationName, myVar, &pOperation);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not open operation.");

    hr = pOperation->get_OperationID(&operationID);
    if(!(SUCCEEDED(hr)))
        MyHandleError("Could not get operation ID.");

    //  Create a SAFEARRAY for the operation ID.
    varOperationIdArray.parray = SafeArrayCreateVector(VT_VARIANT, 0, 1);

    //  Create an array of indexes.
    LONG* index = new LONG[1];
    index[0] = 0;

    //  Populate a SAFEARRAY with the operation ID.
    varOperationId.vt = VT_I4;
    varOperationId.lVal = operationID;

    hr = SafeArrayPutElement(varOperationIdArray.parray, index,
          &varOperationId);
    if(!(SUCCEEDED(hr)))
        MyHandleError("Could not put operation ID in array.");
    
    //  Set SAFEARRAY type.
    varOperationIdArray.vt = VT_ARRAY | VT_VARIANT;

    //  Create business rule parameters.

    //  Create array of business rule parameter names.
    varParamName.parray = SafeArrayCreateVector(VT_VARIANT, 0, 1);
    varParamName.vt = VT_ARRAY | VT_VARIANT;
    nameString.vt = VT_BSTR;
    nameString.bstrVal = SysAllocString(L"ExpAmount");
    SafeArrayPutElement(varParamName.parray, index, &nameString);

    //  Create array of business rule parameter values.
    varParamValue.parray = SafeArrayCreateVector(VT_VARIANT, 0, 1);
    varParamValue.vt = VT_ARRAY | VT_VARIANT;
    expenseAmount.vt = VT_I4;
    expenseAmount.lVal = 100;  // access denied if 500 or more
    SafeArrayPutElement(varParamValue.parray, index, &expenseAmount);

    if(!(objectName = SysAllocString(L"UseFormControl")))//used for audit
        MyHandleError("Could not allocate object name string.");

    //  Check access.
    hr = pClientContext->AccessCheck(
        objectName,
        myVar,                  // use default application scope
        varOperationIdArray,
        varParamName,
        varParamValue,
        myVar,
        myVar,
        myVar,
        &varResultsArray);

    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not complete access check.");

    hr = SafeArrayGetElement(varResultsArray.parray, index, &varResult);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not get result from array.");

    if (varResult.lVal == 0)
        printf("Access granted.\n");
    else
        printf("Access denied.\n");
    

    //  Clean up resources.
    pStore->Release();
    pApp->Release();
    pOperation->Release();
    pClientContext->Release();
    pTask->Release();
    SysFreeString(storeName);
    SysFreeString(appName);
    SysFreeString(operationName);
    SysFreeString(objectName);
    SysFreeString(taskName);
    SysFreeString(bizRule);
    SysFreeString(bizRuleLanguage);
    VariantClear(&myVar);
    VariantClear(&varOperationIdArray);
    VariantClear(&varOperationId);
    VariantClear(&varResultsArray);
    VariantClear(&varResult);
    VariantClear(&varParamName);
    VariantClear(&varParamValue);
    VariantClear(&nameString);
    VariantClear(&expenseAmount);
    CoUninitialize();
}

void MyHandleError(char *s)
{
    printf("An error occurred in running the program.\n");
    printf("%s\n",s);
    printf("Error number %x\n.",GetLastError());
    printf("Program terminating.\n");
    exit(1);
}

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在 C++ 中使用商務邏輯限定存取

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