Endpoints

List of DeSo Identity iframe API endpoints

Note:

The iframe API supports functionality for both public keys and derived keys. You can determine key type from the login response by checking for derivedPublicKeyBase58Check.

sign

AccessLevel: 3, 4 (depends on transaction)

The sign message is responsible for signing transaction hexes. If approval is required an application must call the #approve endpoint in the Window API to sign the transaction.

Payload for public keys

Name	Type	Description
transactionHex	string	Hex of the transaction you want to sign.

Payload for derived keys

Name	Type	Description
transactionHex	string	Hex of the transaction you want to sign.
derivedPublicKeyBase58Check	string	Only required if logged in user is using a derived key to sign on behalf of an owner public key.

Request

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  method: 'sign',
  payload: {
    accessLevel: 4,
    accessLevelHmac: "0fab13f4...",
    encryptedSeedHex: "0fab13f4...",
    transactionHex: "0fab13f4...",
    derivedPublicKeyBase58Check: "0fab13f4...",

  },
}

Response (Success)

You will get this response if the transaction was successful signed.

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    signedTransactionHex: "0fab13f4...",
  },
}

Response (Approval Required)

You will get this response if the accessLevel your user has authorized doesn't match the access level required to sign a transaction.

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    approvalRequired: true,
  },
}

encrypt

AccessLevel: 2

The encrypt API is responsible for encrypting messages. For more details check out Messages

Payload for public keys

Name	Type	Description
recipientPublicKey	string	Public key of the recipient in base58check format.
message	string	Message text that you want to encrypt.

Payload for derived keys

Only required if logged in user is using a derived key to sign on behalf of an owner public key.

recipientPublicKey	string	Public key of the recipient in base58check format.
message	string	Message text that you want to encrypt.
encryptedMessagingKeyRandomness	string	This value is used in place of the encryptedSeedHex when encrypting the message.
derivedPublicKeyBase58Check	string	Public key requesting encryption in base58check format.
ownerPublicKeyBase58Check	string	Public key used only for validation.

Request

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  method: 'encrypt',
  payload: {
    accessLevel: 3,
    accessLevelHmac: "0fab13f4...",
    encryptedSeedHex: "0fab13f4...",
    recipientPublicKey: "BC1YLgwkd7iADbrSgryTfXhMEcsF76cXDaWog4aDzoTunDb2DcZ3myZ"
    message: "This is a message",
    derivedPublicKeyBase58Check: "BC1YLsond7iADbrSgryTfXhMEcsF76cXDaWog4aDzoTunDb2DcZ3myZ",
    ownerPublicKeyBase58Check: "BC1YLdadd7iADbrSgryTfXhMEcsF76cXDaWog4aDzoTunDb2DcZ3myZ",
    encryptedMessagingKeyRandomness: "837fab39...",
    
  },
}

Response for Derived keys (Encrypted Messaging Key Randomness Required)

You will get this response if the request includes a derivedPublicKeyBase58Check and does not include both ownerPublicKeyBase58Check and encryptedMessagingKeyRandomness.

  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    encryptedMessage: "",
    requiresEncryptedMessagingKeyRandomness: true,
  },
}

You can request Encrypted MessagingKeyRandomness by calling the messaging-group in the Window API.

Response (Approval Required)

You will get this response if the accessLevel your user has authorized doesn't match the access level required to sign a transaction.

To fix, the user needs to allow at least access level 2.

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    approvalRequired: true,
  },
}

Response

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    encryptedMessage: "0fab13f4...",
  },
}

decrypt

AccessLevel: 2

The decrypt API is responsible for decrypting messages.

As we mentioned in the Messages section, the current messaging protocol is V2; however, it is still possible to decrypt messages from the V1 scheme.

The decrypt API allows you to decrypt multiple messages at once by passing an array of encryptedMessage objects.

The decrypt API is intended to be constructed right after calling the /api/v0/get-messages-stateless backend API endpoint, and so the structure of encryptedMessage matches the structure of the response from backend.

We recommend tracing through GetMessages() function in the DeSo Protocol frontend's src/app/backend-api.service.ts.

Assuming message is a taken from OrderedContactsWithMessages.Messages from the backend API response, encryptedMessage can be constructed as follows:

encryptedMessage : {
    EncryptedHex: message.EncryptedText,
    PublicKey: message.IsSender ? message.RecipientPublicKeyBase58Check : message.SenderPublicKeyBase58Check,
    IsSender: message.IsSender,
    Legacy: !message.V2,
}

Another use-case for the decrypt API is decrypting unlock-able text in NFTs.

To see how this can be done, we recommend tracing through the DecryptUnlockableTexts() in the DeSo Protocol repository.

Payload for public keys

Name	Type	Description
encryptedMessages	[]encryptedMessage	List of encrypted messages objects.

Payload for derived keys

derivedPublicKeyBase58Check	string	Public key requesting decryption in base58check format.
ownerPublicKeyBase58Check	string	Used to identify which messaging group member entry is used to decrypt group messages.
encryptedMessagingKeyRandomness	string	Required to decrypt the request.
encryptedMessages	[]encryptedMessage	List of encrypted messages objects.

Request

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  method: 'decrypt',
  payload: {
    accessLevel: 3,
    accessLevelHmac: "0fab13f4...",
    encryptedSeedHex: "0fab13f4...",
    derivedPublicKeyBase58Check: "BC1YLsond7iADbrSgryTfXhMEcsF76cXDaWog4aDzoTunDb2DcZ3myZ",
    ownerPublicKeyBase58Check: "BC1YLdadd7iADbrSgryTfXhMEcsF76cXDaWog4aDzoTunDb2DcZ3myZ",
    encryptedMessagingKeyRandomness: "837fab39...",
    encryptedMessage: [
      {
        EncryptedHex: "0f154bcad...",
        PublicKey: "BC1a4gbK1...",
        IsSender: true,
        Legacy: false
      },
      {
        EncryptedHex: "0afa44bcd...",
        PublicKey: "BC1asKl5j1...",
        IsSender: false,
        Legacy: true
      }, ...
    ]
  },
}

Response (Encrypted Messaging Key Randomness Required)

You will get this response if the request includes a derivedPublicKeyBase58Check and does not include both ownerPublicKeyBase58Check and encryptedMessagingKeyRandomness.

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    decryptedHexes: {}
    requiresEncryptedMessagingKeyRandomness: true,
  },
}

Response (Approval Required)

You will get this response if the accessLevel your user has authorized doesn't match the access level required to sign a transaction.

To fix, the user needs to allow at least access level 2.

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    approvalRequired: true,
  },
}

Response

Response contains a decryptedHexes field which is a map of decrypted messages, indexed by EncryptedHex from the request.

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    decryptedHexes: {
      "0f154bcad...": "hello world"
      "0afa44bcd...": "in retrospect it was inevitable",
    }
  },
}

jwt

AccessLevel: 2

The jwt message creates signed JWT tokens that can be used to verify a user's ownership of a specific public key.

The JWT is only valid for 10 minutes.

JWTs are used in some Backend API endpoints such as /api/v0/upload-image. The best practice is to request the JWT right before calling these endpoints.

Payload for public keys

Name	Type	Description
N/A	N/A	No payload.

payload for derived keys

Name	Type	Description
derivedPublicKeyBase58Check	string	Informs Identity on how to sign the transaction.

Request

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  method: 'jwt',
  payload: {
    accessLevel: 3,
    accessLevelHmac: "0fab13f4...",
    encryptedSeedHex: "0fab13f4...",
    derivedPublicKeyBase58Check: "BC1YLsond7iADbrSgryTfXhMEcsF76cXDaWog4aDzoTunDb2DcZ3myZ",
  },
}

Response

{
  id: '21e02080-0ef4-4056-a319-a66403f33768',
  service: 'identity',
  payload: {
    jwt: "eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE2MTk2NDk4MDcsImV4cCI6MTYxOTY0OTg2N30.FKZF8DSwwlnUaW_eRa7Wr1v2QcG7_iDN-NjdqXUcgrSAPg1EdSfpWsLL4GeUiD9zdLUgrNoKU7EsKkE-ZKMaVQ",
  },
}

Validation in Go

In case you want to validate the JWT token in Go, you could use the code below:

func (fes *APIServer) ValidateJWT(publicKey string, jwtToken string) (bool, error) {
	pubKeyBytes, _, err := lib.Base58CheckDecode(publicKey)
	if err != nil {
		return false, errors.Wrapf(err, "Problem decoding public key")
	}

	pubKey, err := btcec.ParsePubKey(pubKeyBytes, btcec.S256())
	if err != nil {
		return false, errors.Wrapf(err, "Problem parsing public key")
	}

	token, err := jwt.Parse(jwtToken, func(token *jwt.Token) (interface{}, error) {
		// Do not check token issued at time. We still check expiration time.
		mapClaims := token.Claims.(jwt.MapClaims)
		delete(mapClaims, "iat")

		// We accept JWT signed by derived keys. To accommodate this, the JWT claims payload should contain the key
		// "derivedPublicKeyBase58Check" with the derived public key in base58 as value.
		if derivedPublicKeyBase58Check, isDerived := mapClaims[JwtDerivedPublicKeyClaim]; isDerived {
			// Parse the derived public key.
			derivedPublicKeyBytes, _, err := lib.Base58CheckDecode(derivedPublicKeyBase58Check.(string))
			if err != nil {
				return nil, errors.Wrapf(err, "Problem decoding derived public key")
			}
			derivedPublicKey, err := btcec.ParsePubKey(derivedPublicKeyBytes, btcec.S256())
			if err != nil {
				return nil, errors.Wrapf(err, "Problem parsing derived public key bytes")
			}
			// Validate the derived public key.
			utxoView, err := fes.mempool.GetAugmentedUniversalView()
			if err != nil {
				return nil, errors.Wrapf(err, "Problem getting utxoView")
			}
			blockHeight := uint64(fes.blockchain.BlockTip().Height)
			if err := utxoView.ValidateDerivedKey(pubKeyBytes, derivedPublicKeyBytes, blockHeight); err != nil {
				return nil, errors.Wrapf(err, "Derived key is not authorize")
			}

			return derivedPublicKey.ToECDSA(), nil
		}

		return pubKey.ToECDSA(), nil
	})

	if err != nil {
		return false, errors.Wrapf(err, "Problem verifying JWT token")
	}

	return token.Valid, nil
}