PublicKeyCredentialRequestOptions.allowCredentials - Web APIs 编辑

Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

allowCredentials is an optional property of the PublicKeyCredentialRequestOptions dictionary which indicates the existing credentials acceptable for retrieval. This is an Array of credential descriptors.

Note: PublicKeyCredentialCreationOptions.excludeCredentials may be used during the creation of the credentials in order to avoid creating new credentials for an existing user with existing public key credential. Contrary to allowCredentials, it is used to filter out credentials.

Syntax

allowCredentials = publicKeyCredentialRequestOptions.allowCredentials

Value

An Array whose elements are objects with the following properties:

type

A string describing type of public-key credential to be created. As of this writing (March 2019), only "public-key" may be used.

id

A BufferSource matching an existing public key credential identifier (PublicKeyCredential.rawId). This identifier is generated during the creation of the PublicKeyCredential instance.

transports Optional

An Array of strings describing the possible transports between the client and the authenticator. The value of the strings may be:

• "usb": the authenticator can be contacted via a removable USB link
• "nfc": the authenticator may be used over NFC (Near Field Communication)
• "ble": the authenticator may be used over BLE (Bluetooth Low Energy)
• "internal": the authenticator is specifically bound to the client device (cannot be removed).

If the authenticator does not contain any of these public key credentials, the client will throw a DOMException "NotAllowedError".

Examples

var options = {
  allowCredentials: [
    {
      transports: ["usb"],
      type: "public-key",
      id: new Uint8Array(26) // actually provided by the server
    },
    {
      transports: ["internal"],
      type: "public-key",
      id: new Uint8Array(26) // actually provided by the server
    }
  ],
  challenge: new Uint8Array([/* bytes sent from the server */])
};

navigator.credentials.get({ "publicKey": options })
    .then(function (credentialInfoAssertion) {
    // send assertion response back to the server
    // to proceed with the control of the credential
}).catch(function (err) {
     console.error(err);
});

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• PublicKeyCredentialCreationOptions.excludeCredentials which is used to filter out existing credentials during creation and avoid creating new credentials for an existing user