尝试从 Visual Studio Code 连接到 Azure 数字孪生： DefaultAzureCredential(); .getToken 错误

Question

我正在尝试从 Visual Studio Code 连接到 Azure Digital wins 实例，使用 Javascript API for Azure Digital Twins。

我安装了 npm install @azure/identity 和 npm install @azure/digital-twins-core，

我可以在 VS Code 的 Powershell 终端中使用“az login”登录到 Azure 门户。 它会找到我的帐户和订阅并登录。

az account get-access-token --output json 返回我的令牌。

这是我试图运行的代码。 它基本上应该在 Azure 数字孪生实例中创建两个模型：

'''

const { DefaultAzureCredential } = require("@azure/identity");
const { DigitalTwinsClient } = require("@azure/digital-twins-core");
const { v4 } = require("uuid");
const { inspect } = require("util");


async function main() {
  const modelId = `dtmi:model_${v4()
    .split("-")
    .join("")};1`;
  const componentId = `dtmi:component_${v4()
    .split("-")
    .join("")};1`;
  const digitalTwinId = `digitalTwin-${v4()}`;

  const temporaryComponent = {
    "@id": componentId,
    "@type": "Interface",
    "@context": "dtmi:dtdl:context;2",
    displayName: "Component1",
    contents: [
      {
        "@type": "Property",
        name: "ComponentProp1",
        schema: "string"
      }
    ]
  };

  const temporaryModel = {
    "@id": modelId,
    "@type": "Interface",
    "@context": "dtmi:dtdl:context;2",
    displayName: "TempModel",
    contents: [
      {
        "@type": "Property",
        name: "Prop1",
        schema: "double"
      },
      {
        "@type": "Component",
        name: "Component1",
        schema: componentId
      }
    ]
  };

  const temporaryTwin = {
    $dtId: digitalTwinId,
    $metadata: {
      $model: modelId
    },
    Prop1: 42,
    Component1: {
      $metadata: {},
      ComponentProp1: "value1"
    }
  };

  // AZURE_DIGITALTWINS_URL: The URL to your Azure Digital Twins instance
  const url = 'https://ParADIM-ADT-Dev.api.wcus.digitaltwins.azure.net';
  if (url === undefined) {
    throw new Error("Required environment variable AZURE_DIGITALTWINS_URL is not set.");
  }

  // DefaultAzureCredential is provided by @azure/identity. It supports
  // different authentication mechanisms and determines the appropriate
  // credential type based of the environment it is executing in. See
  // https://www.npmjs.com/package/@azure/identity for more information on
  // authenticating with DefaultAzureCredential or other implementations of
  // TokenCredential.
  const credential = new DefaultAzureCredential();
  const serviceClient = new DigitalTwinsClient(url, credential);

  // Create models
  const newModels = [temporaryComponent, temporaryModel];
  const models = await serviceClient.createModels(newModels);
  //console.log(`Created Models:`);
  //console.log(inspect(models));
  
}

main().catch((err) => {
  console.log("error code: ", err.code);
  console.log("error message: ", err.message);
  console.log("error stack: ", err.stack);
});

'''

这是我得到的错误：C:\\Program Files\\nodejs\\node.exe .\\index.js 错误代码：未定义的错误消息：JSON 输入错误堆栈的意外结束：错误：AzureCliCredential.getToken 的 JSON 输入意外结束(c:\\ADTProject\\node_modules@azure\\identity\\dist\\index.js:1529:27) at processTicksAndRejections (internal/process/task_queues.js:95:5) at async DefaultAzureCredential.getToken (c:\\ADTProject\\node_modules@天蓝色\\身份\\dist\\index.js:1358:25)

因此，JSON 输入意外结束。 这个错误来自@azure\\identity\\dist\\index.js，它是 azure\\identity 包的一部分，所以不是我写的代码。 我使用的代码来自教程，并且 JSON 是兼容的。 似乎在执行 getToken 函数时出错。

任何帮助表示赞赏！ 我撞到了一堵墙！

谢谢！！

Answer 1

当从文档中提取代码时，查看错误跟踪，它无法从指定的凭据中检索令牌，这可能是我们传递它的方式的问题。 下面是我们通常在 JavaScript 中的连接方式：

const client = new SecretClient(keyVaultUrl, new DefaultAzureCredential());

以下是与 Cosmos 和存储通信的示例代码：

import { SecretClient } from '@azure/keyvault-secrets';
import { DefaultAzureCredential } from '@azure/identity';
import { CosmosClient } from '@azure/cosmos';

const keyVaultUrl = process.env('APP_KEY_VAULT_URI');
const credential = new DefaultAzureCredential();
let storageClient;
let cosmosClient;

async function configureClients() {
    const kvClient = new SecretClient(keyVaultUrl, credential);
    const storageUri = await client.getSecret('storageUri');
    const cosmosDbConnectionString = await client.getSecret('cosmosDb');

    cosmosClient = new CosmosClient(cosmosDbConnectonString);
    storageClient = new BlobServiceClient(storageUri, credential);
}

有关环境变量的更多信息，设置 keyvault 请参阅 azure sdk 博客以了解身份验证