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/*
     This file is part of GNUnet.
     Copyright (C) 2016 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet 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
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
*/

/**
 * @author Martin Schanzenbach
 *
 * @file
 * Identity provider service; implements identity provider for GNUnet
 *
 * @defgroup reclaim  Identity Provider service
 * @{
 */
#ifndef GNUNET_RECLAIM_SERVICE_H
#define GNUNET_RECLAIM_SERVICE_H

#ifdef __cplusplus
extern "C" {
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif

#include "gnunet_reclaim_attribute_lib.h"
#include "gnunet_util_lib.h"

/**
 * Version number of the re:claimID API.
 */
#define GNUNET_RECLAIM_VERSION 0x00000000

/**
 * Opaque handle to access the service.
 */
struct GNUNET_RECLAIM_Handle;


/**
 * Opaque handle for an operation at the re:claimID service.
 */
struct GNUNET_RECLAIM_Operation;


/**
 * The an authorization ticket. This ticket is meant to be transferred
 * out of band the a relying party.
 * The contents of a ticket must be protected and should be treated as a
 * SHARED SECRET between user and relying party.
 */
struct GNUNET_RECLAIM_Ticket
{
  /**
   * The ticket issuer (= the user)
   */
  struct GNUNET_CRYPTO_EcdsaPublicKey identity;

  /**
   * The ticket audience (= relying party)
   */
  struct GNUNET_CRYPTO_EcdsaPublicKey audience;

  /**
   * The ticket random (NBO)
   */
  uint64_t rnd;
};


/**
 * Method called when a token has been issued.
 * On success returns a ticket that can be given to the relying party to retrive
 * the token
 *
 * @param cls closure
 * @param ticket the ticket
 */
typedef void (*GNUNET_RECLAIM_TicketCallback) (
    void *cls, const struct GNUNET_RECLAIM_Ticket *ticket);


/**
 * Continuation called to notify client about result of the
 * operation.
 *
 * @param cls The callback closure
 * @param success #GNUNET_SYSERR on failure
 * @param emsg NULL on success, otherwise an error message
 */
typedef void (*GNUNET_RECLAIM_ContinuationWithStatus) (void *cls,
                                                       int32_t success,
                                                       const char *emsg);


/**
 * Callback used to notify the client of attribute results.
 *
 * @param cls The callback closure
 * @param identity The identity authoritative over the attributes
 * @param attr The attribute
 */
typedef void (*GNUNET_RECLAIM_AttributeResult) (
    void *cls, const struct GNUNET_CRYPTO_EcdsaPublicKey *identity,
    const struct GNUNET_RECLAIM_ATTRIBUTE_Claim *attr);


/**
 * Connect to the re:claimID service.
 *
 * @param cfg Configuration to contact the re:claimID service.
 * @return handle to communicate with the service
 */
struct GNUNET_RECLAIM_Handle *
GNUNET_RECLAIM_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);


/**
 * Store an attribute.  If the attribute is already present,
 * it is replaced with the new attribute.
 *
 * @param h handle to the re:claimID service
 * @param pkey Private key of the identity to add an attribute to
 * @param attr The attribute
 * @param exp_interval The relative expiration interval for the attribute
 * @param cont Continuation to call when done
 * @param cont_cls Closure for @a cont
 * @return handle Used to to abort the request
 */
struct GNUNET_RECLAIM_Operation *
GNUNET_RECLAIM_attribute_store (
    struct GNUNET_RECLAIM_Handle *h,
    const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
    const struct GNUNET_RECLAIM_ATTRIBUTE_Claim *attr,
    const struct GNUNET_TIME_Relative *exp_interval,
    GNUNET_RECLAIM_ContinuationWithStatus cont, void *cont_cls);


/**
 * List all attributes for a local identity.
 * This MUST lock the `struct GNUNET_RECLAIM_Handle`
 * for any other calls than #GNUNET_RECLAIM_get_attributes_next() and
 * #GNUNET_RECLAIM_get_attributes_stop. @a proc will be called once
 * immediately, and then again after
 * #GNUNET_RECLAIM_get_attributes_next() is invoked.
 *
 * On error (disconnect), @a error_cb will be invoked.
 * On normal completion, @a finish_cb proc will be
 * invoked.
 *
 * @param h Handle to the re:claimID service
 * @param identity Identity to iterate over
 * @param error_cb Function to call on error (i.e. disconnect),
 *        the handle is afterwards invalid
 * @param error_cb_cls Closure for @a error_cb
 * @param proc Function to call on each attribute
 * @param proc_cls Closure for @a proc
 * @param finish_cb Function to call on completion
 *        the handle is afterwards invalid
 * @param finish_cb_cls Closure for @a finish_cb
 * @return an iterator Handle to use for iteration
 */
struct GNUNET_RECLAIM_AttributeIterator *
GNUNET_RECLAIM_get_attributes_start (
    struct GNUNET_RECLAIM_Handle *h,
    const struct GNUNET_CRYPTO_EcdsaPrivateKey *identity,
    GNUNET_SCHEDULER_TaskCallback error_cb, void *error_cb_cls,
    GNUNET_RECLAIM_AttributeResult proc, void *proc_cls,
    GNUNET_SCHEDULER_TaskCallback finish_cb, void *finish_cb_cls);


/**
 * Calls the record processor specified in #GNUNET_RECLAIM_get_attributes_start
 * for the next record.
 *
 * @param it The iterator
 */
void
GNUNET_RECLAIM_get_attributes_next (
    struct GNUNET_RECLAIM_AttributeIterator *it);


/**
 * Stops iteration and releases the handle for further calls. Must
 * be called on any iteration that has not yet completed prior to calling
 * #GNUNET_RECLAIM_disconnect.
 *
 * @param it the iterator
 */
void
GNUNET_RECLAIM_get_attributes_stop (
    struct GNUNET_RECLAIM_AttributeIterator *it);


/**
 * Issues a ticket to a relying party. The identity may use
 * GNUNET_RECLAIM_ticket_consume to consume the ticket
 * and retrieve the attributes specified in the attribute list.
 *
 * @param h the identity provider to use
 * @param iss the issuing identity (= the user)
 * @param rp the subject of the ticket (= the relying party)
 * @param attrs the attributes that the relying party is given access to
 * @param cb the callback
 * @param cb_cls the callback closure
 * @return handle to abort the operation
 */
struct GNUNET_RECLAIM_Operation *
GNUNET_RECLAIM_ticket_issue (
    struct GNUNET_RECLAIM_Handle *h,
    const struct GNUNET_CRYPTO_EcdsaPrivateKey *iss,
    const struct GNUNET_CRYPTO_EcdsaPublicKey *rp,
    const struct GNUNET_RECLAIM_ATTRIBUTE_ClaimList *attrs,
    GNUNET_RECLAIM_TicketCallback cb, void *cb_cls);

/**
 * Revoked an issued ticket. The relying party will be unable to retrieve
 * attributes. Other issued tickets remain unaffected.
 * This includes tickets issued to other relying parties as well as to
 * other tickets issued to the audience specified in this ticket.
 *
 * @param h the identity provider to use
 * @param identity the issuing identity
 * @param ticket the ticket to revoke
 * @param cb the callback
 * @param cb_cls the callback closure
 * @return handle to abort the operation
 */
struct GNUNET_RECLAIM_Operation *
GNUNET_RECLAIM_ticket_revoke (
    struct GNUNET_RECLAIM_Handle *h,
    const struct GNUNET_CRYPTO_EcdsaPrivateKey *identity,
    const struct GNUNET_RECLAIM_Ticket *ticket,
    GNUNET_RECLAIM_ContinuationWithStatus cb, void *cb_cls);


/**
 * Consumes an issued ticket. The ticket is used to retrieve identity
 * information from the issuer
 *
 * @param h the identity provider to use
 * @param identity the identity that is the subject of the issued ticket (the
 * relying party)
 * @param ticket the issued ticket to consume
 * @param cb the callback to call
 * @param cb_cls the callback closure
 * @return handle to abort the operation
 */
struct GNUNET_RECLAIM_Operation *
GNUNET_RECLAIM_ticket_consume (
    struct GNUNET_RECLAIM_Handle *h,
    const struct GNUNET_CRYPTO_EcdsaPrivateKey *identity,
    const struct GNUNET_RECLAIM_Ticket *ticket,
    GNUNET_RECLAIM_AttributeResult cb, void *cb_cls);

/**
 * Lists all tickets that have been issued to remote
 * identites (relying parties)
 *
 * @param h the identity provider to use
 * @param identity the issuing identity
 * @param error_cb function to call on error (i.e. disconnect),
 *        the handle is afterwards invalid
 * @param error_cb_cls closure for @a error_cb
 * @param proc function to call on each ticket; it
 *        will be called repeatedly with a value (if available)
 * @param proc_cls closure for @a proc
 * @param finish_cb function to call on completion
 *        the handle is afterwards invalid
 * @param finish_cb_cls closure for @a finish_cb
 * @return an iterator handle to use for iteration
 */
struct GNUNET_RECLAIM_TicketIterator *
GNUNET_RECLAIM_ticket_iteration_start (
    struct GNUNET_RECLAIM_Handle *h,
    const struct GNUNET_CRYPTO_EcdsaPrivateKey *identity,
    GNUNET_SCHEDULER_TaskCallback error_cb, void *error_cb_cls,
    GNUNET_RECLAIM_TicketCallback proc, void *proc_cls,
    GNUNET_SCHEDULER_TaskCallback finish_cb, void *finish_cb_cls);


/**
 * Calls the ticket processor specified in
 * #GNUNET_RECLAIM_ticket_iteration_start for the next record.
 *
 * @param it the iterator
 */
void
GNUNET_RECLAIM_ticket_iteration_next (struct GNUNET_RECLAIM_TicketIterator *it);

/**
 * Stops iteration and releases the handle for further calls.  Must
 * be called on any iteration that has not yet completed prior to calling
 * #GNUNET_RECLAIM_disconnect.
 *
 * @param it the iterator
 */
void
GNUNET_RECLAIM_ticket_iteration_stop (struct GNUNET_RECLAIM_TicketIterator *it);

/**
 * Disconnect from identity provider service.
 *
 * @param h identity provider service to disconnect
 */
void
GNUNET_RECLAIM_disconnect (struct GNUNET_RECLAIM_Handle *h);


/**
 * Cancel an identity provider operation.  Note that the operation MAY still
 * be executed; this merely cancels the continuation; if the request
 * was already transmitted, the service may still choose to complete
 * the operation.
 *
 * @param op operation to cancel
 */
void
GNUNET_RECLAIM_cancel (struct GNUNET_RECLAIM_Operation *op);

#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif


/* ifndef GNUNET_RECLAIM_SERVICE_H */
#endif

/** @} */ /* end of group identity */

/* end of gnunet_reclaim_service.h */