/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 * (C) Copyright 2010 - 2011 Red Hat, Inc.
 */

#ifndef NM_SECRET_AGENT_H
#define NM_SECRET_AGENT_H

#include <nm-connection.h>

G_BEGIN_DECLS

#define NM_SECRET_AGENT_ERROR         (nm_secret_agent_error_quark ())

GQuark nm_secret_agent_error_quark (void);

/**
 * NMSecretAgentError:
 * @NM_SECRET_AGENT_ERROR_NOT_AUTHORIZED: the caller (ie, NetworkManager) is not
 *  authorized to make this request
 * @NM_SECRET_AGENT_ERROR_INVALID_CONNECTION: the connection for which secrets
 *  were requested could not be found
 * @NM_SECRET_AGENT_ERROR_USER_CANCELED: the request was canceled by the user
 * @NM_SECRET_AGENT_ERROR_AGENT_CANCELED: the agent canceled the request
 *  because it was requested to do so by NetworkManager
 * @NM_SECRET_AGENT_ERROR_INTERNAL_ERROR: some internal error in the agent caused
 *  the request to fail
 * @NM_SECRET_AGENT_ERROR_NO_SECRETS: the agent cannot find any secrets for this
 *  connection
 *
 * #NMSecretAgentError values are passed by secret agents back to NetworkManager
 * when they encounter problems retrieving secrets on behalf of NM.
 */
typedef enum {
	NM_SECRET_AGENT_ERROR_NOT_AUTHORIZED = 0, /*< nick=NotAuthorized >*/
	NM_SECRET_AGENT_ERROR_INVALID_CONNECTION, /*< nick=InvalidConnection >*/
	NM_SECRET_AGENT_ERROR_USER_CANCELED,      /*< nick=UserCanceled >*/
	NM_SECRET_AGENT_ERROR_AGENT_CANCELED,     /*< nick=AgentCanceled >*/
	NM_SECRET_AGENT_ERROR_INTERNAL_ERROR,     /*< nick=InternalError >*/
	NM_SECRET_AGENT_ERROR_NO_SECRETS,         /*< nick=NoSecrets >*/
} NMSecretAgentError;

/**
 * NMSecretAgentGetSecretsFlags:
 * @NM_SECRET_AGENT_GET_SECRETS_FLAG_NONE: no special behavior; by default no
 * user interaction is allowed and requests for secrets are fulfilled from
 * persistent storage, or if no secrets are available an error is returned.
 * @NM_SECRET_AGENT_GET_SECRETS_FLAG_ALLOW_INTERACTION: allows the request to
 * interact with the user, possibly prompting via UI for secrets if any are
 * required, or if none are found in persistent storage.
 * @NM_SECRET_AGENT_GET_SECRETS_FLAG_REQUEST_NEW: explicitly prompt for new
 * secrets from the user.  This flag signals that NetworkManager thinks any
 * existing secrets are invalid or wrong.  This flag implies that interaction
 * is allowed.
 * @NM_SECRET_AGENT_GET_SECRETS_FLAG_USER_REQUESTED: set if the request was
 * initiated by user-requested action via the D-Bus interface, as opposed to
 * automatically initiated by NetworkManager in response to (for example) scan
 * results or carrier changes.
 *
 * #NMSecretAgentGetSecretsFlags values modify the behavior of a GetSecrets request.
 */
typedef enum /*< flags >*/ {
	NM_SECRET_AGENT_GET_SECRETS_FLAG_NONE = 0x0,
	NM_SECRET_AGENT_GET_SECRETS_FLAG_ALLOW_INTERACTION = 0x1,
	NM_SECRET_AGENT_GET_SECRETS_FLAG_REQUEST_NEW = 0x2,
	NM_SECRET_AGENT_GET_SECRETS_FLAG_USER_REQUESTED = 0x4
} NMSecretAgentGetSecretsFlags;

#define NM_TYPE_SECRET_AGENT            (nm_secret_agent_get_type ())
#define NM_SECRET_AGENT(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), NM_TYPE_SECRET_AGENT, NMSecretAgent))
#define NM_SECRET_AGENT_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), NM_TYPE_SECRET_AGENT, NMSecretAgentClass))
#define NM_IS_SECRET_AGENT(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), NM_TYPE_SECRET_AGENT))
#define NM_IS_SECRET_AGENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), NM_TYPE_SECRET_AGENT))
#define NM_SECRET_AGENT_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), NM_TYPE_SECRET_AGENT, NMSecretAgentClass))

#define NM_SECRET_AGENT_IDENTIFIER          "identifier"
#define NM_SECRET_AGENT_AUTO_REGISTER       "auto-register"
#define NM_SECRET_AGENT_REGISTERED          "registered"

#define NM_SECRET_AGENT_REGISTRATION_RESULT "registration-result"

typedef struct {
	GObject parent;
} NMSecretAgent;

/**
 * NMSecretAgentGetSecretsFunc:
 * @agent: the secret agent object
 * @connection: (transfer none): the connection for which secrets were requested,
 * note that this object will be unrefed after the callback has returned, use
 * g_object_ref()/g_object_unref() if you want to use this object after the callback
 * has returned
 * @secrets: (element-type utf8 GLib.HashTable): the #GHashTable containing
 * the requested secrets in the same format as an #NMConnection hash (as
 * created by nm_connection_to_hash() for example).  Each key in @secrets
 * should be the name of a #NMSetting object (like "802-11-wireless-security")
 * and each value should be a #GHashTable.  The sub-hashes map string:#GValue
 * where the string is the setting property name (like "psk") and the value
 * is the secret
 * @error: if the secrets request failed, give a descriptive error here
 * @user_data: caller-specific data to be passed to the function
 *
 * Called as a result of a request by NM to retrieve secrets.  When the
 * #NMSecretAgent subclass has finished retrieving secrets and is ready to
 * return them, or to return an error, this function should be called with
 * those secrets or the error.
 *
 * To easily create the hash table to return the WiFi PSK, you could do
 * something like this:
 * <example>
 *  <title>Creating a secrets hash</title>
 *  <programlisting>
 *   NMConnection *secrets;
 *   NMSettingWirelessSecurity *s_wsec;
 *   GHashTable *secrets_hash;
 *
 *   secrets = nm_connection_new ();
 *   s_wsec = (NMSettingWirelessSecurity *) nm_setting_wireless_security_new ();
 *   g_object_set (G_OBJECT (s_wsec),
 *                 NM_SETTING_WIRELESS_SECURITY_PSK, "my really cool PSK",
 *                 NULL);
 *   nm_connection_add_setting (secrets, NM_SETTING (s_wsec));
 *   secrets_hash = nm_connection_to_hash (secrets, NM_SETTING_HASH_FLAG_ALL);
 *
 *   (call the NMSecretAgentGetSecretsFunc with secrets_hash)
 *
 *   g_object_unref (secrets);
 *   g_hash_table_unref (secrets_hash);
 *  </programlisting>
 * </example>
 */
typedef void (*NMSecretAgentGetSecretsFunc) (NMSecretAgent *agent,
                                             NMConnection *connection,
                                             GHashTable *secrets,
                                             GError *error,
                                             gpointer user_data);

/**
 * NMSecretAgentSaveSecretsFunc:
 * @agent: the secret agent object
 * @connection: (transfer none): the connection for which secrets were to be saved,
 * note that this object will be unrefed after the callback has returned, use
 * g_object_ref()/g_object_unref() if you want to use this object after the callback
 * has returned
 * @error: if the saving secrets failed, give a descriptive error here
 * @user_data: caller-specific data to be passed to the function
 *
 * Called as a result of a request by NM to save secrets.  When the
 * #NMSecretAgent subclass has finished saving the secrets, this function
 * should be called.
 */
typedef void (*NMSecretAgentSaveSecretsFunc) (NMSecretAgent *agent,
                                              NMConnection *connection,
                                              GError *error,
                                              gpointer user_data);

/**
 * NMSecretAgentDeleteSecretsFunc:
 * @agent: the secret agent object
 * @connection: (transfer none): the connection for which secrets were to be deleted,
 * note that this object will be unrefed after the callback has returned, use
 * g_object_ref()/g_object_unref() if you want to use this object after the callback
 * has returned
 * @error: if the deleting secrets failed, give a descriptive error here
 * @user_data: caller-specific data to be passed to the function
 *
 * Called as a result of a request by NM to delete secrets.  When the
 * #NMSecretAgent subclass has finished deleting the secrets, this function
 * should be called.
 */
typedef void (*NMSecretAgentDeleteSecretsFunc) (NMSecretAgent *agent,
                                                NMConnection *connection,
                                                GError *error,
                                                gpointer user_data);

typedef struct {
	GObjectClass parent;

	/* Virtual methods for subclasses */

	/* Called when the subclass should retrieve and return secrets.  Subclass
	 * must copy or reference any arguments it may require after returning from
	 * this method, as the arguments will freed (except for 'self', 'callback',
	 * and 'user_data' of course).  If the request is canceled, the callback
	 * should still be called, but with the NM_SECRET_AGENT_ERROR_AGENT_CANCELED
	 * error.
	 */
	void (*get_secrets) (NMSecretAgent *self,
	                     NMConnection *connection,
	                     const char *connection_path,
	                     const char *setting_name,
	                     const char **hints,
	                     NMSecretAgentGetSecretsFlags flags,
	                     NMSecretAgentGetSecretsFunc callback,
	                     gpointer user_data);

	/* Called when the subclass should cancel an outstanding request to
	 * get secrets for a given connection.  Canceling the request MUST
	 * call the callback that was passed along with the initial get_secrets
	 * call, sending the NM_SECRET_AGENT_ERROR/NM_SECRET_AGENT_ERROR_AGENT_CANCELED
	 * error to that callback.
	 */
	void (*cancel_get_secrets) (NMSecretAgent *self,
	                            const char *connection_path,
	                            const char *setting_name);

	/* Called when the subclass should save the secrets contained in the
	 * connection to backing storage.  Subclass must copy or reference any
	 * arguments it may require after returning from this method, as the
	 * arguments will freed (except for 'self', 'callback', and 'user_data'
	 * of course).
	 */
	void (*save_secrets) (NMSecretAgent *self,
	                      NMConnection *connection,
	                      const char *connection_path,
	                      NMSecretAgentSaveSecretsFunc callback,
	                      gpointer user_data);

	/* Called when the subclass should delete the secrets contained in the
	 * connection from backing storage.  Subclass must copy or reference any
	 * arguments it may require after returning from this method, as the
	 * arguments will freed (except for 'self', 'callback', and 'user_data'
	 * of course).
	 */
	void (*delete_secrets) (NMSecretAgent *self,
	                        NMConnection *connection,
	                        const char *connection_path,
	                        NMSecretAgentDeleteSecretsFunc callback,
	                        gpointer user_data);

	/* Signals */
	void (*registration_result) (NMSecretAgent *agent, GError *error);

	/* Padding for future expansion */
	void (*_reserved1) (void);
	void (*_reserved2) (void);
	void (*_reserved3) (void);
	void (*_reserved4) (void);
	void (*_reserved5) (void);
	void (*_reserved6) (void);
} NMSecretAgentClass;

GType nm_secret_agent_get_type (void);

gboolean nm_secret_agent_register (NMSecretAgent *self);

gboolean nm_secret_agent_unregister (NMSecretAgent *self);

gboolean nm_secret_agent_get_registered (NMSecretAgent *self);

void nm_secret_agent_get_secrets (NMSecretAgent *self,
                                  NMConnection *connection,
                                  const char *setting_name,
                                  const char **hints,
                                  NMSecretAgentGetSecretsFlags flags,
                                  NMSecretAgentGetSecretsFunc callback,
                                  gpointer user_data);

void nm_secret_agent_save_secrets (NMSecretAgent *self,
                                   NMConnection *connection,
                                   NMSecretAgentSaveSecretsFunc callback,
                                   gpointer user_data);

void nm_secret_agent_delete_secrets (NMSecretAgent *self,
                                     NMConnection *connection,
                                     NMSecretAgentDeleteSecretsFunc callback,
                                     gpointer user_data);

G_END_DECLS

#endif /* NM_SECRET_AGENT_H */
