## GTlsInteraction

GTlsInteraction — Interaction with the user during TLS operations.

## Synopsis

    #include <gio/gio.h>

                        GTlsInteraction;
    enum                GTlsInteractionResult;
    GTlsInteractionResult g_tls_interaction_ask_password    (GTlsInteraction *interaction,
                                                             GTlsPassword *password,
                                                             GCancellable *cancellable,
                                                             GError **error);
    void                g_tls_interaction_ask_password_async
                                                            (GTlsInteraction *interaction,
                                                             GTlsPassword *password,
                                                             GCancellable *cancellable,
                                                             GAsyncReadyCallback callback,
                                                             gpointer user_data);
    GTlsInteractionResult g_tls_interaction_ask_password_finish
                                                            (GTlsInteraction *interaction,
                                                             GAsyncResult *result,
                                                             GError **error);
    GTlsInteractionResult g_tls_interaction_invoke_ask_password
                                                            (GTlsInteraction *interaction,
                                                             GTlsPassword *password,
                                                             GCancellable *cancellable,
                                                             GError **error);

## Object Hierarchy

      GObject
       +----GTlsInteraction

## Description

GTlsInteraction provides a mechanism for the TLS connection and database code to interact with the user. It can be used to ask the user for passwords.

To use a GTlsInteraction with a TLS connection use `g_tls_connection_set_interaction()`.

Callers should instantiate a derived class that implements the various interaction methods to show the required dialogs.

Callers should use the 'invoke' functions like `g_tls_interaction_invoke_ask_password()` to run interaction methods. These functions make sure that the interaction is invoked in the main loop and not in the current thread, if the current thread is not running the main loop.

Derived classes can choose to implement whichever interactions methods they'd like to support by overriding those virtual methods in their class initialization function. Any interactions not implemented will return `G_TLS_INTERACTION_UNHANDLED`. If a derived class implements an async method, it must also implement the corresponding finish method.

## Details

### GTlsInteraction

    typedef struct _GTlsInteraction GTlsInteraction;

An object representing interaction that the TLS connection and database might have with the user.

Since 2.30

### enum GTlsInteractionResult

    typedef enum {
      G_TLS_INTERACTION_UNHANDLED,
      G_TLS_INTERACTION_HANDLED,
      G_TLS_INTERACTION_FAILED
    } GTlsInteractionResult;

GTlsInteractionResult is returned by various functions in GTlsInteraction when finishing an interaction request.

`G_TLS_INTERACTION_UNHANDLED` | The interaction was unhandled (i.e. not implemented).
`G_TLS_INTERACTION_HANDLED` | The interaction completed, and resulting data is available.
`G_TLS_INTERACTION_FAILED` | The interaction has failed, or was cancelled. and the operation should be aborted.

Since 2.30

### g_tls_interaction_ask_password ()

    GTlsInteractionResult g_tls_interaction_ask_password    (GTlsInteraction *interaction,
                                                             GTlsPassword *password,
                                                             GCancellable *cancellable,
                                                             GError **error);

Run synchronous interaction to ask the user for a password. In general, `g_tls_interaction_invoke_ask_password()` should be used instead of this function.

Derived subclasses usually implement a password prompt, although they may also choose to provide a password from elsewhere. The `password` value will be filled in and then `callback` will be called. Alternatively the user may abort this password request, which will usually abort the TLS connection.

If the interaction is cancelled by the cancellation object, or by the user then `G_TLS_INTERACTION_FAILED` will be returned with an error that contains a `G_IO_ERROR_CANCELLED` error code. Certain implementations may not support immediate cancellation.

`interaction` : | a GTlsInteraction object
`password` : | a GTlsPassword object
`cancellable` : | an optional GCancellable cancellation object
`error` : | an optional location to place an error on failure
Returns : | The status of the ask password interaction.

Since 2.30

### g_tls_interaction_ask_password_async ()

    void                g_tls_interaction_ask_password_async
                                                            (GTlsInteraction *interaction,
                                                             GTlsPassword *password,
                                                             GCancellable *cancellable,
                                                             GAsyncReadyCallback callback,
                                                             gpointer user_data);

Run asynchronous interaction to ask the user for a password. In general, `g_tls_interaction_invoke_ask_password()` should be used instead of this function.

Derived subclasses usually implement a password prompt, although they may also choose to provide a password from elsewhere. The `password` value will be filled in and then `callback` will be called. Alternatively the user may abort this password request, which will usually abort the TLS connection.

If the interaction is cancelled by the cancellation object, or by the user then `G_TLS_INTERACTION_FAILED` will be returned with an error that contains a `G_IO_ERROR_CANCELLED` error code. Certain implementations may not support immediate cancellation.

Certain implementations may not support immediate cancellation.

`interaction` : | a GTlsInteraction object
`password` : | a GTlsPassword object
`cancellable` : | an optional GCancellable cancellation object
`callback` : | will be called when the interaction completes. [allow-none]
`user_data` : | data to pass to the `callback`. [allow-none]

Since 2.30

### g_tls_interaction_ask_password_finish ()

    GTlsInteractionResult g_tls_interaction_ask_password_finish
                                                            (GTlsInteraction *interaction,
                                                             GAsyncResult *result,
                                                             GError **error);

Complete an ask password user interaction request. This should be once the `g_tls_interaction_ask_password_async()` completion callback is called.

If `G_TLS_INTERACTION_HANDLED` is returned, then the GTlsPassword passed to `g_tls_interaction_ask_password()` will have its password filled in.

If the interaction is cancelled by the cancellation object, or by the user then `G_TLS_INTERACTION_FAILED` will be returned with an error that contains a `G_IO_ERROR_CANCELLED` error code.

`interaction` : | a GTlsInteraction object
`result` : | the result passed to the callback
`error` : | an optional location to place an error on failure
Returns : | The status of the ask password interaction.

Since 2.30

### g_tls_interaction_invoke_ask_password ()

    GTlsInteractionResult g_tls_interaction_invoke_ask_password
                                                            (GTlsInteraction *interaction,
                                                             GTlsPassword *password,
                                                             GCancellable *cancellable,
                                                             GError **error);

Invoke the interaction to ask the user for a password. It invokes this interaction in the main loop, specifically the GMainContext returned by `g_main_context_get_thread_default()` when the interaction is created. This is called by called by GTlsConnection or GTlsDatabase to ask the user for a password.

Derived subclasses usually implement a password prompt, although they may also choose to provide a password from elsewhere. The `password` value will be filled in and then `callback` will be called. Alternatively the user may abort this password request, which will usually abort the TLS connection.

The implementation can either be a synchronous (eg: modal dialog) or an asynchronous one (eg: modeless dialog). This function will take care of calling which ever one correctly.

If the interaction is cancelled by the cancellation object, or by the user then `G_TLS_INTERACTION_FAILED` will be returned with an error that contains a `G_IO_ERROR_CANCELLED` error code. Certain implementations may not support immediate cancellation.

`interaction` : | a GTlsInteraction object
`password` : | a GTlsPassword object
`cancellable` : | an optional GCancellable cancellation object
`error` : | an optional location to place an error on failure
Returns : | The status of the ask password interaction.

Since 2.30