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This document describes the architecture of the feature allowing users to link their account to a new device, referred to as the Link new device process.

Terminology 

To understand this document, here are some key terms:

import side: The device importing the account.
export side: The device exporting the account.
token: A URI that identifies a device on the Distributed Hash Table (DHT).

State machine 

The daemon manages this functionality using a state machine.

The state evolution is communicated to clients, enabling the appropriate interface display.

Currently, the state machine is symmetrical for both import side and export side, though certain states are inaccessible depending on the side.

State overview 

Status	Nama	Usage (Side)	Deskripsi
0	Init	Tidak ada	Initial state.
1	Token available	Import only	The `token` is available. This is the URI identifying the new device on the DHT, displayed as text or a QR code.
2	Menghubungkan	Export/Import	A peer-to-peer connection is being established.
3	Authenticating	Export/Import	The identity of the account and device address are being confirmed.
4	In progress	Export/Import	State transition, the account archive is being transferred.
5	Selesai	Export/Import	Final state. Represents success or failure.

Detail 

The state machine can include supplementary information for display purposes, passed as a map<String, String> called details.

Details for `import side`

Status	Nama	Detail
0	Init	Not applicable.
1	Token available	`token`: A 59-character URI with the prefix `jami-auth://`.
2	Menghubungkan	No details.
3	Authenticating	`peer_id`: Jami ID of the imported account. `auth_scheme`: `{"", "none", "password"}` (empty if unprotected). `auth_error`: `{"bad_password"}`.
4	In progress	No details.
5	Selesai	`error`: `{"", "none", "network", "authentication"}` (empty if no error).

Details for `export side`

Status	Nama	Detail
0	Init	Not applicable.
1	Token available	Not applicable.
2	Menghubungkan	No details.
3	Authenticating	`peer_address`: IP address of the exporting device.
4	In progress	No details.
5	Selesai	`error`: `{"", "none", "network", "authentication"}` (empty if no error).

API between daemon and client 

API for `import side`

Signal Name	Direction	Purpose
`addAccount`	Outbound	Announces the intent to import an account. Must include the key `Account.archiveURL="jami-auth"`.
`provideAccountAuthentication`	Outbound	Provides a password if needed and confirms the identity of the imported account.
`removeAccount`	Outbound	Cancels the operation.
`deviceAuthStateChanged`	Inbound	Indicates the new state and provides details.

API for `export side`

Signal Name	Direction	Purpose
`addDevice`	Outbound	Announces the intent to export an account.
`confirmAddDevice`	Outbound	Confirms the address of the exporting device.
`cancelAddDevice`	Outbound	Cancels the operation.
`addDeviceStateChanged`	Inbound	Indicates the new state and provides details.

Daemon state machine 

        stateDiagram-v2
    state "Import Side" as Import {
        [*] --> Import_Init
        Import_Init --> Import_TokenAvailable: Generate token
        Import_TokenAvailable --> Import_Connecting: Peer detected
        Import_Connecting --> Import_Authenticating: Connection established
        Import_Authenticating --> Import_InProgress: Auth success
        Import_InProgress --> Import_Done: Transfer complete
        note right of Import_TokenAvailable
            Provides:
            - Authentication code
            - QR data
        end note
        note right of Import_Authenticating
            May require password
            auth_scheme: "", "none", "password"
        end note
        note right of Import_Done
            error: "", "none", "network", "authentication"
        end note
    }
    state "Export Side" as Export {
        [*] --> Export_Init
        Export_Init --> Export_Connecting: Token validated
        Export_Connecting --> Export_Authenticating: Connection established
        Export_Authenticating --> Export_InProgress: Auth success
        Export_InProgress --> Export_Done: Transfer complete
        note right of Export_Init
            Accepts:
            - Authentication code
            - QR data
        end note
        note right of Export_Authenticating
            Confirms peer address
        end note
    }

Client state machine 

        stateDiagram-v2
    [*] --> Initial
    Initial --> ImportDevice: ImportFromDevice selected
    Initial --> ExportDevice: ExportToDevice selected
    state "Import Device" as ImportDevice {
        [*] --> Import_Init
        Import_Init --> Import_TokenAvailable: Token received
        Import_TokenAvailable --> Import_Connecting: Peer detected
        Import_Connecting --> Import_Authenticating: Connection established
        Import_Authenticating --> Import_InProgress: Auth success
        Import_InProgress --> Import_Done: Transfer complete
        Import_Authenticating --> Import_Error: Bad password
        Import_Connecting --> Import_Error: Connection failed
        Import_InProgress --> Import_Error: Transfer failed
        Import_Error --> [*]: Reset
        Import_Done --> [*]: Account ready
        note right of Import_TokenAvailable
            Display:
            - QR code
            - Authentication code
            - Copy button
        end note
        note right of Import_Authenticating
            Show password input if needed
        end note
    }
    state "Export Device" as ExportDevice {
        [*] --> Export_Init
        state Export_Init {
            [*] --> ShowInputOptions
            ShowInputOptions --> ScanQR: Camera selected
            ShowInputOptions --> ManualEntry: Manual selected
            ScanQR --> QRScanning: Start camera
            QRScanning --> TokenObtained: QR detected
            QRScanning --> ShowInputOptions: Cancel scan
            ManualEntry --> TokenObtained: Valid code entered
            ManualEntry --> ShowInputOptions: Cancel entry
        }
        Export_Init --> Export_Connecting: Token validated
        Export_Connecting --> Export_Authenticating: Connection established
        Export_Authenticating --> Export_InProgress: Auth provided
        Export_InProgress --> Export_Done: Transfer complete
        Export_Connecting --> Export_Error: Invalid token
        Export_Authenticating --> Export_Error: Auth failed
        Export_InProgress --> Export_Error: Transfer failed
        Export_Error --> [*]: Reset
        Export_Done --> [*]: Device added
        note right of Export_Init
            Input options:
            - QR scanner
            - Manual code entry
        end note
        note right of Export_Authenticating
            Confirm peer device
        end note
    }
    ImportDevice --> Initial: Back/Cancel
    ExportDevice --> Initial: Back/Cancel

Full sequence diagram (import and export)

        sequenceDiagram
    box white Import Side
    participant IC as New Client
    participant ID as New Daemon
    end
    box white Export Side
    participant ED as Old Daemon
    participant EC as Old Client
    end
    %% Initial Setup
    IC->>ID: addAccount(archiveURL="jami-auth")
    activate ID
    ID-->>IC: deviceAuthStateChanged(state=TOKEN_AVAILABLE)
    Note over IC: Display QR code<br/>and auth token
    %% Export Side Initiation
    EC->>EC: User chooses to export
    EC->>EC: Scan QR/Enter token
    EC->>ED: addDevice(token)
    activate ED
    %% Connection Establishment
    ED->>ID: DHT connection request
    ID-->>IC: deviceAuthStateChanged(state=CONNECTING)
    ED-->>EC: addDeviceStateChanged(state=CONNECTING)
    %% Authentication Phase
    ID-->>IC: deviceAuthStateChanged(state=AUTHENTICATING,<br/>peer_id, auth_scheme)
    ED-->>EC: addDeviceStateChanged(state=AUTHENTICATING,<br/>peer_address)
    alt Account is password protected
        IC->>IC: Show password prompt
        IC->>ID: provideAccountAuthentication(password)
    end
    EC->>ED: confirmAddDevice()
    %% Transfer Phase
    ID-->>IC: deviceAuthStateChanged(state=IN_PROGRESS)
    ED-->>EC: addDeviceStateChanged(state=IN_PROGRESS)
    ED->>ID: Transfer account archive
    %% Completion
    ID-->>IC: deviceAuthStateChanged(state=DONE, error="")
    ED-->>EC: addDeviceStateChanged(state=DONE, error="")
    deactivate ID
    deactivate ED
    Note over IC,EC: Account successfully linked
    alt Error Scenarios
        ID-->>IC: deviceAuthStateChanged(state=DONE, error="network")
        ED-->>EC: addDeviceStateChanged(state=DONE, error="network")
        Note over IC,EC: Network error during transfer
        ID-->>IC: deviceAuthStateChanged(state=DONE, error="authentication")
        ED-->>EC: addDeviceStateChanged(state=DONE, error="authentication")
        Note over IC,EC: Authentication failed
    end
    %% Cancellation Scenarios
    rect rgb(240, 240, 240)
        Note over IC,EC: Optional Cancellation Flows
        IC->>ID: removeAccount()
        EC->>ED: cancelAddDevice()
    end