Send a message

To send a message in a conversation, follow these steps:

1. Extract the private key tied to the m/0/0 path of your Twetch 12-word seed.

A JavaScript example can be found here.

2. Fetch the encrypted key generated from Step 3 of Initiating a Chat.

HTTP POST request:

URL: https://api.twetch.app/v1/graphql

Headers: {
    Authorization: ‘Bearer <twetch_authorization_token>’
}
Body: {
    query:  `{
        conversationById(id: "${convId}") {
          id
          createdAt
          me {
            encryptedKey
          }
        }
    }`
}

Response:

{
  "data": {
    conversationById: {
        id: 'c5ef415a-5753-430d-a57c-dca1ff40a5e8',
        createdAt: '2020-10-19T20:14:57.036066+02:00',
        me: {
            encryptedKey: 'QklFMQIvWga0Ndyv0ru8dL+W/Cvk6pAu9T9v79ARua7IGT2XGewBpmTIsViEG73yCSu9+lbOsdG/iWnLIy19if7PfUW2I2UaD9n8gaOb2ad/P5qnr3HUiJMpMDPwC4j+cxHbUmvGeAHEK4E3eyzLxthkNyB0'
        }
    }
  }
}

3. ECIES decrypt the encrypted key from Step 3.

A JavaScript example can be found here.

4. AES encrypt the message being sent to the decrypted ECIES key from Step 3.

A JavaScript example can be found here.

5. Create a JSON payload:

{
    conversationId: <conversation_id>
    userId: <from_user_id>
    description: <encrypted_message_generated_in_Step_4>
}

6. Post the payload from Step 5 to the graphql endpoint:

HTTP POST request:

URL: https://api.twetch.app/v1/graphql

Headers: {
    Authorization: ‘Bearer <twetch_authorization_token>’
}
Body: {
    query:  `mutation createMessage($payload: MessageInput!) {
        createMessage(input: { message: $payload }) {
            message {
                description
                id
            }
        }
    }`, { <payload_generated_in_Step_5> }
}

Response:

{
  "data": {
    createMessage: {
        message: {
            description: 'eeaaf4cd',
            id: '1fb19cd0-8267-4070-b6f4-11e7dc31df35'
        }
    }
  }
}