调用请求服务 REST API

项目
02/08/2024

Microsoft Entra 验证 ID 包括请求服务 REST API。使用此 API 可以颁发和验证凭据。本问将介绍如何开始使用请求服务 REST API。

API 访问令牌

应用程序需要包含具有所需权限的有效访问令牌，以便它可以访问请求服务 REST API。 Microsoft 标识平台发布的访问令牌包含请求服务 REST API 用于验证调用方的信息（范围）。访问令牌确保调用方具有执行所请求的操作的适当权限。

若要获取访问令牌，你的应用必须向 Microsoft 标识平台注册，并由管理员授权以访问请求服务 REST API。若尚未注册 verifiable-credentials-app 应用程序，请依次参阅如何注册应用和生成应用程序机密。

获取访问令牌

使用 OAuth 2.0 客户端凭据授予流通过 Microsoft 标识平台获取访问令牌。为此，请使用受信任的库。在此教程中，我们使用 Microsoft 身份验证库 (MSAL)。 MSAL 简化了向可调用安全 Web API 的应用添加身份验证和授权的过程。

POST /{tenant}/oauth2/v2.0/token HTTP/1.1           //Line breaks for clarity
Host: login.microsoftonline.com
Content-Type: application/x-www-form-urlencoded

client_id=00001111-aaaa-2222-bbbb-3333cccc4444
&scope=3db474b9-6a0c-4840-96ac-1fceb342124f/.default
&client_secret=sampleCredentia1s
&grant_type=client_credentials

// Initialize MSAL library by using the following code
ConfidentialClientApplicationBuilder.Create(AppSettings.ClientId)
    .WithClientSecret(AppSettings.ClientSecret)
    .WithAuthority(new Uri(AppSettings.Authority))
    .Build();

// Acquire an access token
result = await app.AcquireTokenForClient(AppSettings.Scopes)
                .ExecuteAsync();

// Initialize MSAL library by using the following code
const msalConfig = {
  auth: {
      clientId: config.azClientId,
      authority: `https://login.microsoftonline.com/${config.azTenantId}`,
      clientSecret: config.azClientSecret,
  },
  system: {
      loggerOptions: {
          loggerCallback(loglevel, message, containsPii) {
              console.log(message);
          },
          piiLoggingEnabled: false,
          logLevel: msal.LogLevel.Verbose,
      }
  }
};
const cca = new msal.ConfidentialClientApplication(msalConfig);
const msalClientCredentialRequest = {
  scopes: ["3db474b9-6a0c-4840-96ac-1fceb342124f/.default"],
  skipCache: false, 
};
module.exports.msalCca = cca;
module.exports.msalClientCredentialRequest = msalClientCredentialRequest;

// Acquire an access token
const result = await mainApp.msalCca.acquireTokenByClientCredential(mainApp.msalClientCredentialRequest);
    if ( result ) {
      accessToken = result.accessToken;
    }

# Initialize MSAL library by using the following code
msalCca = msal.ConfidentialClientApplication( config["azClientId"], 
    authority="https://login.microsoftonline.com/" + config["azTenantId"],
    client_credential=config["azClientSecret"],
    )

# Acquire an access token
accessToken = ""
result = msalCca.acquire_token_for_client( scopes="3db474b9-6a0c-4840-96ac-1fceb342124f/.default" )
if "access_token" in result:
    accessToken = result['access_token']

// Initialize MSAL library by using the following code
ConfidentialClientApplication app = ConfidentialClientApplication.builder(
                clientId,
                ClientCredentialFactory.createFromSecret(clientSecret))
                .authority(authority)
                .build();

// Acquire an access token
ClientCredentialParameters clientCredentialParam = ClientCredentialParameters.builder(
                Collections.singleton(scope))
                .build();
CompletableFuture<IAuthenticationResult> future = app.acquireToken(clientCredentialParam);
IAuthenticationResult result = future.get();
return result.accessToken();

在上面的代码中，提供以下参数：

参数	条件	说明
颁发机构	必需	应用程序计划对其进行操作的目录租户。例如：`https://login.microsoftonline.com/{your-tenant}`。（使用租户 ID 或名称替换 `your-tenant`。）
客户端 ID	必需	分配给应用的应用程序 ID。可以在注册应用的 Azure 门户中找到此信息。
客户端机密	必需	为应用生成的客户端密码。
作用域	必需	必须设置为 `3db474b9-6a0c-4840-96ac-1fceb342124f/.default`。此设置将生成一个角色声明为 `VerifiableCredential.Create.All` 的访问令牌。

有关如何使用控制台应用的标识获取访问令牌的详细信息，请参阅这些文章之一：

还可以使用证书访问令牌请求（而不是使用客户端密码）。

POST /{tenant}/oauth2/v2.0/token HTTP/1.1   //Line breaks for clarity
Host: login.microsoftonline.com
Content-Type: application/x-www-form-urlencoded

client_id=00001111-aaaa-2222-bbbb-3333cccc4444
&scope=3db474b9-6a0c-4840-96ac-1fceb342124f/.default
&client_assertion_type=urn%3Aietf%3Aparams%3Aoauth%3Aclient-assertion-type%3Ajwt-bearer
&client_assertion=eyJhbGciOiJSUzI1NiIsIng1dCI6Imd4OHRHeXN5amNScUtqRlBuZDdSRnd2d1pJMCJ9.eyJ{a lot of characters here}M8U3bSUKKJDEg
&grant_type=client_credentials

// Initialize MSAL library by using the following code
X509Certificate2 certificate = AppSettings.ReadCertificate(AppSettings.CertificateName);
    app = ConfidentialClientApplicationBuilder.Create(AppSettings.ClientId)
        .WithCertificate(certificate)
        .WithAuthority(new Uri(AppSettings.Authority))
        .Build();

// Acquire an access token
result = await app.AcquireTokenForClient(AppSettings.Scopes)
                .ExecuteAsync();

// Initialize MSAL library by using the following code
const msalConfig = {
  auth: {
      clientId: config.azClientId,
      authority: `https://login.microsoftonline.com/${config.azTenantId}`,
      clientCertificate: {
            thumbprint: "CERT_THUMBPRINT", // a 40-digit hexadecimal string
            privateKey: "CERT_PRIVATE_KEY"
        }
  },
  system: {
      loggerOptions: {
          loggerCallback(loglevel, message, containsPii) {
              console.log(message);
          },
          piiLoggingEnabled: false,
          logLevel: msal.LogLevel.Verbose,
      }
  }
};
const cca = new msal.ConfidentialClientApplication(msalConfig);
const msalClientCredentialRequest = {
  scopes: ["3db474b9-6a0c-4840-96ac-1fceb342124f/.default"],
  skipCache: false, 
};
module.exports.msalCca = cca;
module.exports.msalClientCredentialRequest = msalClientCredentialRequest;

// Acquire an access token
const result = await mainApp.msalCca.acquireTokenByClientCredential(mainApp.msalClientCredentialRequest);
    if ( result ) {
      accessToken = result.accessToken;
    }

# Initialize MSAL library by using the following code
with open(config["azCertificatePrivateKeyLocation"], "rb") as file:
    private_key = file.read()
with open(config["azCertificateLocation"]) as file:
    public_certificate = file.read()
cert = load_pem_x509_certificate(data=bytes(public_certificate, 'UTF-8'), backend=default_backend())
thumbprint = (cert.fingerprint(hashes.SHA1()).hex())
msalCca = msal.ConfidentialClientApplication( config["azClientId"], 
    authority="https://login.microsoftonline.com/" + config["azTenantId"],
    client_credential={
        "private_key": private_key,
        "thumbprint": thumbprint,
        "public_certificate": public_certificate
    }
)    
# Acquire an access token
accessToken = ""
result = msalCca.acquire_token_for_client( scopes="3db474b9-6a0c-4840-96ac-1fceb342124f/.default" )
if "access_token" in result:
    accessToken = result['access_token']

// Initialize MSAL library by using the following code
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(Files.readAllBytes(Paths.get(certKeyLocation)));
PrivateKey key = KeyFactory.getInstance("RSA").generatePrivate(spec);
java.io.InputStream certStream = (java.io.InputStream)new ByteArrayInputStream(Files.readAllBytes(Paths.get(certLocation)));
X509Certificate cert = (X509Certificate) CertificateFactory.getInstance("X.509").generateCertificate(certStream);
ConfidentialClientApplication app = ConfidentialClientApplication.builder(
                clientId,
                ClientCredentialFactory.createFromCertificate(key, cert))
                .authority(authority)
                .build();
// Acquire an access token
ClientCredentialParameters clientCredentialParam = ClientCredentialParameters.builder(
                Collections.singleton(scope))
                .build();
CompletableFuture<IAuthenticationResult> future = app.acquireToken(clientCredentialParam);
IAuthenticationResult result = future.get();
return result.accessToken();

调用 API

发布或验证可验证凭据：

构建对请求服务 REST API 的 HTTP POST 请求。 URL 中不再需要租户 ID，因为它在访问令牌中显示为声明。

问题

POST https://verifiedid.did.msidentity.com/v1.0/verifiableCredentials/createIssuanceRequest

验证

POST https://verifiedid.did.msidentity.com/v1.0/verifiableCredentials/createPresentationRequest

将访问令牌作为持有者令牌附加到 HTTP 请求中的授权标头。
```
Authorization: Bearer <token>
```
将 Content-Type 标头设置为 Application/json。
准备好将发布或出示请求的有效负载附加到请求正文。
将请求提交到请求服务 REST API。

请求服务 API 在成功调用后将返回 HTTP 状态代码 201 Created。如果 API 调用返回错误，请检查错误参考文档。

发布请求示例

下面的示例演示了可验证凭据的发布请求。有关有效负载的信息，请参阅请求服务 REST API 发布规范。

POST https://verifiedid.did.msidentity.com/v1.0/verifiableCredentials/createIssuanceRequest
Content-Type: application/json
Authorization: Bearer  <token>

{...JSON payload...}

颁发请求
包含到期日期

使用 idTokenHint 证明流的颁发请求：

{
    "authority": "did:web:verifiedid.contoso.com",
    "callback": {
        "url": "https://contoso.com/api/issuer/issuanceCallback",
        "state": "de19cb6b-36c1-45fe-9409-909a51292a9c",
        "headers": {
            "api-key": "OPTIONAL API-KEY for CALLBACK EVENTS"
        }
    },
    "registration": {
        "clientName": "Verifiable Credential Expert Sample"
    },
    "type": "VerifiedCredentialExpert",
    "manifestUrl": "https://verifiedid.did.msidentity.com/v1.0/00001111-aaaa-2222-bbbb-3333cccc4444/verifiableCredentials/contracts/VerifiedCredentialExpert1",
    "pin": {
        "value": "3539",
        "length": 4
    },
    "claims": {
        "given_name": "Megan",
        "family_name": "Bowen"
    }
}

使用设置到期日期的 idTokenHint 证明流的颁发请求：

{
    "authority": "did:web:verifiedid.contoso.com",
    "callback": {
        "url": "https://contoso.com/api/issuer/issuanceCallback",
        "state": "de19cb6b-36c1-45fe-9409-909a51292a9c",
        "headers": {
            "api-key": "OPTIONAL API-KEY for CALLBACK EVENTS"
        }
    },
    "registration": {
        "clientName": "Verifiable Credential Expert Sample"
    },
    "type": "VerifiedCredentialExpert",
    "manifestUrl": "https://verifiedid.did.msidentity.com/v1.0/00001111-aaaa-2222-bbbb-3333cccc4444/verifiableCredentials/contracts/VerifiedCredentialExpert1",
    "pin": {
        "value": "3539",
        "length": 4
    },
    "claims": {
        "given_name": "Megan",
        "family_name": "Bowen"
    },
    "expirationDate": "2024-12-31T23:59:59.000Z"
}

有关完整代码，请参阅以下代码示例之一：

出示请求示例

下面的示例演示了可验证凭据的出示请求。有关有效负载的信息，请参阅请求服务 REST API 出示规范。

POST https://verifiedid.did.msidentity.com/v1.0/verifiableCredentials/createPresentationRequest
Content-Type: application/json
Authorization: Bearer  <token>

{...JSON payload...}

具有特定类型和颁发者的凭据的出示请求：

{
  "authority": "did:web:verifiedid.contoso.com",
  "callback": {
    "url": "https://contoso.com/api/verifier/presentationCallback",
    "state": "92d076dd-450a-4247-aa5b-d2e75a1a5d58",
    "headers": {
      "api-key": "OPTIONAL API-KEY for CALLBACK EVENTS"
    }
  },
  "registration": {
    "clientName": "Veritable Credential Expert Verifier"
  },
  "includeReceipt": true,
  "requestedCredentials": [
    {
      "type": "VerifiedCredentialExpert",
      "purpose": "So we can see that you a veritable credentials expert",
      "acceptedIssuers": [
        "did:web:verifiedid.contoso.com"
      ],
      "configuration": {
        "validation": {
          "allowRevoked": true,
          "validateLinkedDomain": true
        }
      }
    }
  ]
}

具有声明约束的出示请求：

{
  "authority": "did:web:verifiedid.contoso.com",
  "includeReceipt": false,
  "registration": {
    "clientName": "Contoso Job Application Center",
    "purpose": "Provide proof of attended courses"
  },
  "callback": {
    "url": "https://contoso.com/api/verifier/presentationCallback",
    "state": "92d076dd-450a-4247-aa5b-d2e75a1a5d58",
    "headers": {
      "api-key": "OPTIONAL API-KEY for CALLBACK EVENTS"
    }
  },
  "requestedCredentials": [
    {
      "type": "FabrikamCourseCertification",
      "acceptedIssuers": [ "did:web:learn.fabrikam.com" ],
      "constraints": [ 
        {  
          "claimName": "courseCode",
          "values": ["FC100", "FC110", "FC150"], 
        }, 
        {  
          "claimName": "courseTitle",
          "contains": "network", 
        } 
      ],
      "configuration": {
        "validation": {
          "allowRevoked": false,
          "validateLinkedDomain": true
        }
      }
    }
  ]
}

有关 FaceCheck 的演示请求。使用 FaceCheck 时，includeReceipt 必须为 false，因为此时不支持收据。

{
  "authority": "did:web:verifiedid.contoso.com",
  "includeReceipt": false,
  "registration": {
    "clientName": "Contoso Job Application Center",
    "purpose": "Provide proof of attended courses"
  },
  "callback": {
    "url": "https://contoso.com/api/verifier/presentationCallback",
    "state": "92d076dd-450a-4247-aa5b-d2e75a1a5d58",
    "headers": {
      "api-key": "OPTIONAL API-KEY for CALLBACK EVENTS"
    }
  },
  "requestedCredentials": [
    {
      "type": "VerifiedEmployee",
      "acceptedIssuers": [ "did:web:learn.contoso.com" ],
      "configuration": {
        "validation": {
          "allowRevoked": false,
          "validateLinkedDomain": true,
          "faceCheck": {
            "sourcePhotoClaimName": "photo",
            "matchConfidenceThreshold": 70
          }
        }
      }
    }
  ]
}

有关完整代码，请参阅以下代码示例之一：

回调事件

请求负载包含发布和出示回调终结点。终结点是 Web 应用程序的一部分，应该可以通过 HTTPS 协议公开访问。请求服务 API 会调用你的终结点，从而将特定事件通知给你的应用。例如，这类事件可能是用户扫描 QR 码、在验证器应用中使用深层链接或完成出示过程。

下方示意图描述了应用对请求服务 REST API 进行的调用，以及对应用程序进行的回调。

显示对 API 的调用和回调事件的示意图。

配置终结点以侦听传入的 HTTP POST 请求。下面的代码片段演示如何处理发布回调 HTTP 请求以及如何相应更新 UI：

不适用。选择其他一种编程语言。

[HttpPost]
public async Task<ActionResult> IssuanceCallback()
{
try
{
    string content = new System.IO.StreamReader(this.Request.Body).ReadToEndAsync().Result;
    _log.LogTrace("callback!: " + content);
    JObject issuanceResponse = JObject.Parse(content);
    
    // More code here
    if (issuanceResponse["code"].ToString() == "request_retrieved")
    {
        var cacheData = new
        {
            status = "request_retrieved",
            message = "QR Code is scanned. Waiting for issuance...",
        };
        _cache.Set(state, JsonConvert.SerializeObject(cacheData));

        // More code here
    }
}

有关完整代码，请参阅 GitHub 存储库上的发布和出示代码。

mainApp.app.post('/api/issuer/issuance-request-callback', parser, async (req, res) => {
  var body = '';
  req.on('data', function (data) {
    body += data;
  });
  req.on('end', function () {
    requestTrace( req );
    console.log( body );
    var issuanceResponse = JSON.parse(body.toString());
    var message = null;
    
    if ( issuanceResponse.code == "request_retrieved" ) {
      message = "QR Code is scanned. Waiting for issuance to complete...";
    }
    if ( issuanceResponse.code == "issuance_successful" ) {
      message = "Credential successfully issued";
    }
    if ( issuanceResponse.code == "issuance_error" ) {
      message = issuanceResponse.error.message;
    }
    
    // More code here
    res.send()
  });  
  res.send()
})

@app.route("/api/issuer/issuance-request-callback", methods = ['POST'])
def issuanceRequestApiCallback():
    if request.headers['api-key'] != apiKey:
        return Response( jsonify({'error':'api-key wrong or missing'}), status=401, mimetype='application/json')

    issuanceResponse = request.json
    if issuanceResponse["code"] == "request_retrieved":
        cacheData = {
            "status": issuanceResponse["code"],
            "message": "QR Code is scanned. Waiting for issuance to complete..."
        }
        cache.set( issuanceResponse["state"], json.dumps(cacheData) )
        return ""

    if issuanceResponse["code"] == "issuance_successful":
        cacheData = {
            "status": issuanceResponse["code"],
            "message": "Credential successfully issued"
        }
        cache.set( issuanceResponse["state"], json.dumps(cacheData) )
        return ""

    if issuanceResponse["code"] == "issuance_error":
        cacheData = {
            "status": issuanceResponse["code"],
            "message": issuanceResponse["error"]["message"]
        }
        cache.set( issuanceResponse["state"], json.dumps(cacheData) )
        return ""

    return ""

@RequestMapping(value = "/api/issuer/issue-request-callback", method = RequestMethod.POST, produces = "application/json", consumes = "application/json")
    public ResponseEntity<String> issueRequestCallback( HttpServletRequest request
                                                      , @RequestHeader HttpHeaders headers
                                                      , @RequestBody String body ) {
        ObjectMapper objectMapper = new ObjectMapper();
        try {
            if ( !request.getHeader("api-key").equals(apiKey) ) {
                lgr.info( "api-key wrong or missing" );
                return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body( "api-key wrong or missing" );
            }
            JsonNode presentationResponse = objectMapper.readTree( body );
            String code = presentationResponse.path("code").asText();
            ObjectNode data = null;
            if ( code.equals( "request_retrieved" )  ) {
                data = objectMapper.createObjectNode();
                data.put("message", "QR Code is scanned. Waiting for issuance to complete..." );
            }
            if ( code.equals("issuance_successful") ) {
                data = objectMapper.createObjectNode();
                data.put("message", "Credential successfully issued" );
            }
            if ( code.equals( "issuance_error" ) ) {
                data = objectMapper.createObjectNode();
                data.put("message", presentationResponse.path("error").path("message").asText() );
            }
            if ( data != null ) {
                data.put("status", code );
                cache.put( presentationResponse.path("state").asText(), objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(data) );
            }
        } catch (java.io.IOException ex) {
            ex.printStackTrace();
            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body( "Technical error" );
        }
        return ResponseEntity.ok().body( "{}" );
    }