Javascript Cognito：如何正确实现增强的简化身份验证流

我正在尝试获取上描述的增强简化身份验证流

问题是我不知道如何正确使用SDK

  AWS.config.region = "ap-northeast-2"
  const cognitoParams = {
    IdentityPoolId: "ap-northeast-2:...",
    Logins: {
      "accounts.google.com": googleUser.getAuthResponse().id_token
    }
  }
  AWS.config.credentials = new AWS.CognitoIdentityCredentials(cognitoParams)

  const identity = new AWS.CognitoIdentity()
  identity.getId(cognitoParams, function (err, identityId) {
    console.log(identityId)

    const identityParams = Object.assign({}, cognitoParams, {
      IdentityId: identityId
    })

    identity.getCredentialsForIdentity(identityParams, function (err, data) {
      console.log(data)
    })
  })

2

console.log

给出

null

AWS.config.region = "ap-northeast-2"
const cognitoParams = {
  IdentityPoolId: "ap-northeast-2:31cc246c-bd2e-46ee-91da-2b8eefcf0745",
  Logins: {
    "accounts.google.com": googleUser.getAuthResponse().id_token
  }
}
AWS.config.credentials = new AWS.CognitoIdentityCredentials(cognitoParams)

AWS.config.credentials.getId(function (err, identityId) {
  console.log(identityId)

  const identityParams = Object.assign({}, cognitoParams, {
    IdentityId: identityId
  })

  AWS.config.credentials.getCredentialsForIdentity(identityParams, function (err, data) {
    console.log(data)
  })
})

上面给出了标识，但由于无法读取未定义的的属性“getCredentialsForIdentity”而失败

---

我如何实现这一点

我发现下面的方法很有效。。。我应该从

CognitoIdentity

的实例调用函数，而不是

CognitoIdentityCredentials

。。。但这在文件中并不清楚

事实上，它使用了

CognitoIdentityCredentials

，原因是什么？我什么时候用这两种方法

  AWS.config.region = "ap-northeast-2"
  const cognitoParams = {
    IdentityPoolId: "ap-northeast-2:31cc246c-bd2e-46ee-91da-2b8eefcf0745",
    Logins: {
      "accounts.google.com": googleUser.getAuthResponse().id_token
    }
  }
  // AWS.config.credentials = new AWS.CognitoIdentityCredentials(cognitoParams)

  const identity = new AWS.CognitoIdentity()
  identity.getId(cognitoParams, function (err, identityData) {
    if (err) {
      return console.error(err)
    }

    const identityParams = {
      IdentityId: identityData.IdentityId,
      Logins: cognitoParams.Logins
    }

    identity.getCredentialsForIdentity(identityParams, function (err, data) {
      if (err) {
        return console.error(err)
      }
      console.log(data)
    })

---

我发现下面的工作。。。我应该从

CognitoIdentity

的实例调用函数，而不是

CognitoIdentityCredentials

。。。但这在文件中并不清楚

事实上，它使用了

CognitoIdentityCredentials

，原因是什么？我什么时候用这两种方法

  AWS.config.region = "ap-northeast-2"
  const cognitoParams = {
    IdentityPoolId: "ap-northeast-2:31cc246c-bd2e-46ee-91da-2b8eefcf0745",
    Logins: {
      "accounts.google.com": googleUser.getAuthResponse().id_token
    }
  }
  // AWS.config.credentials = new AWS.CognitoIdentityCredentials(cognitoParams)

  const identity = new AWS.CognitoIdentity()
  identity.getId(cognitoParams, function (err, identityData) {
    if (err) {
      return console.error(err)
    }

    const identityParams = {
      IdentityId: identityData.IdentityId,
      Logins: cognitoParams.Logins
    }

    identity.getCredentialsForIdentity(identityParams, function (err, data) {
      if (err) {
        return console.error(err)
      }
      console.log(data)
    })