renaming mint->exchange

1 files changed, 0 insertions, 1220 deletions

diff --git a/src/include/taler_mint_service.h b/src/include/taler_mint_service.h
deleted file mode 100644
index 1502edfbc..000000000
--- a/src/include/taler_mint_service.h
+++ /dev/null
@@ -1,1220 +0,0 @@
-/*
-  This file is part of TALER
-  Copyright (C) 2014, 2015 GNUnet e.V.
-
-  TALER 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, or (at your option) any later version.
-
-  TALER 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
-  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
-*/
-/**
- * @file include/taler_mint_service.h
- * @brief C interface of libtalermint, a C library to use mint's HTTP API
- * @author Sree Harsha Totakura <sreeharsha@totakura.in>
- * @author Christian Grothoff
- */
-#ifndef _TALER_MINT_SERVICE_H
-#define _TALER_MINT_SERVICE_H
-
-#include "taler_util.h"
-
-/* ********************* event loop *********************** */
-
-/**
- * @brief Handle to this library context.  This is where the
- * main event loop logic lives.
- */
-struct TALER_MINT_Context;
-
-
-/**
- * Initialise a context.  A context should be used for each thread and should
- * not be shared among multiple threads.
- *
- * @return the context, NULL on error (failure to initialize)
- */
-struct TALER_MINT_Context *
-TALER_MINT_init (void);
-
-
-/**
- * Obtain the information for a select() call to wait until
- * #TALER_MINT_perform() is ready again.  Note that calling
- * any other TALER_MINT-API may also imply that the library
- * is again ready for #TALER_MINT_perform().
- *
- * Basically, a client should use this API to prepare for select(),
- * then block on select(), then call #TALER_MINT_perform() and then
- * start again until the work with the context is done.
- *
- * This function will NOT zero out the sets and assumes that @a max_fd
- * and @a timeout are already set to minimal applicable values.  It is
- * safe to give this API FD-sets and @a max_fd and @a timeout that are
- * already initialized to some other descriptors that need to go into
- * the select() call.
- *
- * @param ctx context to get the event loop information for
- * @param read_fd_set will be set for any pending read operations
- * @param write_fd_set will be set for any pending write operations
- * @param except_fd_set is here because curl_multi_fdset() has this argument
- * @param max_fd set to the highest FD included in any set;
- *        if the existing sets have no FDs in it, the initial
- *        value should be "-1". (Note that `max_fd + 1` will need
- *        to be passed to select().)
- * @param timeout set to the timeout in milliseconds (!); -1 means
- *        no timeout (NULL, blocking forever is OK), 0 means to
- *        proceed immediately with #TALER_MINT_perform().
- */
-void
-TALER_MINT_get_select_info (struct TALER_MINT_Context *ctx,
-                            fd_set *read_fd_set,
-                            fd_set *write_fd_set,
-                            fd_set *except_fd_set,
-                            int *max_fd,
-                            long *timeout);
-
-
-/**
- * Run the main event loop for the Taler interaction.
- *
- * @param ctx the library context
- */
-void
-TALER_MINT_perform (struct TALER_MINT_Context *ctx);
-
-
-/**
- * Cleanup library initialisation resources.  This function should be called
- * after using this library to cleanup the resources occupied during library's
- * initialisation.
- *
- * @param ctx the library context
- */
-void
-TALER_MINT_fini (struct TALER_MINT_Context *ctx);
-
-
-/* *********************  /keys *********************** */
-
-
-/**
- * List of possible options to be passed to
- * #TALER_MINT_connect().
- */
-enum TALER_MINT_Option
-{
-  /**
-   * Terminator (end of option list).
-   */
-  TALER_MINT_OPTION_END = 0
-
-};
-
-
-/**
- * @brief Mint's signature key
- */
-struct TALER_MINT_SigningPublicKey
-{
-  /**
-   * The signing public key
-   */
-  struct TALER_MintPublicKeyP key;
-
-  /**
-   * Validity start time
-   */
-  struct GNUNET_TIME_Absolute valid_from;
-
-  /**
-   * Validity expiration time
-   */
-  struct GNUNET_TIME_Absolute valid_until;
-};
-
-
-/**
- * @brief Public information about a mint's denomination key
- */
-struct TALER_MINT_DenomPublicKey
-{
-  /**
-   * The public key
-   */
-  struct TALER_DenominationPublicKey key;
-
-  /**
-   * The hash of the public key.
-   */
-  struct GNUNET_HashCode h_key;
-
-  /**
-   * Timestamp indicating when the denomination key becomes valid
-   */
-  struct GNUNET_TIME_Absolute valid_from;
-
-  /**
-   * Timestamp indicating when the denomination key can’t be used anymore to
-   * withdraw new coins.
-   */
-  struct GNUNET_TIME_Absolute withdraw_valid_until;
-
-  /**
-   * Timestamp indicating when coins of this denomination become invalid.
-   */
-  struct GNUNET_TIME_Absolute deposit_valid_until;
-
-  /**
-   * When do signatures with this denomination key become invalid?
-   * After this point, these signatures cannot be used in (legal)
-   * disputes anymore, as the Mint is then allowed to destroy its side
-   * of the evidence.  @e expire_legal is expected to be significantly
-   * larger than @e expire_spend (by a year or more).
-   */
-  struct GNUNET_TIME_Absolute expire_legal;
-
-  /**
-   * The value of this denomination
-   */
-  struct TALER_Amount value;
-
-  /**
-   * The applicable fee for withdrawing a coin of this denomination
-   */
-  struct TALER_Amount fee_withdraw;
-
-  /**
-   * The applicable fee to spend a coin of this denomination
-   */
-  struct TALER_Amount fee_deposit;
-
-  /**
-   *The applicable fee to melt/refresh a coin of this denomination
-   */
-  struct TALER_Amount fee_refresh;
-};
-
-
-/**
- * @brief Information we get from the mint about auditors.
- */
-struct TALER_MINT_AuditorInformation
-{
-  /**
-   * Public key of the auditing institution.
-   */
-  struct TALER_AuditorPublicKeyP auditor_pub;
-
-  /**
-   * URL of the auditing institution.  The application must check that
-   * this is an acceptable auditor for its purpose and also verify
-   * that the @a auditor_pub matches the auditor's public key given at
-   * that website.  We expect that in practice software is going to
-   * often ship with an initial list of accepted auditors, just like
-   * browsers ship with a CA root store.
-   *
-   * This field may be NULL. (#3987).
-   */
-  const char *auditor_url;
-
-  /**
-   * Number of denomination keys audited by this auditor.
-   */
-  unsigned int num_denom_keys;
-
-  /**
-   * Array of length @a denom_keys with the denomination
-   * keys audited by this auditor.  Note that the array
-   * elements point to the same locations as the entries
-   * in the key's main `denom_keys` array.
-   */
-  const struct TALER_MINT_DenomPublicKey **denom_keys;
-};
-
-
-/**
- * @brief Information about keys from the mint.
- */
-struct TALER_MINT_Keys
-{
-
-  /**
-   * Long-term offline signing key of the mint.
-   */
-  struct TALER_MasterPublicKeyP master_pub;
-
-  /**
-   * Array of the mint's online signing keys.
-   */
-  struct TALER_MINT_SigningPublicKey *sign_keys;
-
-  /**
-   * Array of the mint's denomination keys.
-   */
-  struct TALER_MINT_DenomPublicKey *denom_keys;
-
-  /**
-   * Array of the keys of the auditors of the mint.
-   */
-  struct TALER_MINT_AuditorInformation *auditors;
-
-  /**
-   * Length of the @e sign_keys array.
-   */
-  unsigned int num_sign_keys;
-
-  /**
-   * Length of the @e denom_keys array.
-   */
-  unsigned int num_denom_keys;
-
-  /**
-   * Length of the @e auditors array.
-   */
-  unsigned int num_auditors;
-
-};
-
-
-/**
- * Function called with information about who is auditing
- * a particular mint and what key the mint is using.
- *
- * @param cls closure
- * @param keys information about the various keys used
- *        by the mint
- */
-typedef void
-(*TALER_MINT_CertificationCallback) (void *cls,
-                                     const struct TALER_MINT_Keys *keys);
-
-
-/**
- * @brief Handle to the mint.  This is where we interact with
- * a particular mint and keep the per-mint information.
- */
-struct TALER_MINT_Handle;
-
-
-/**
- * Initialise a connection to the mint.  Will connect to the
- * mint and obtain information about the mint's master public
- * key and the mint's auditor.  The respective information will
- * be passed to the @a cert_cb once available, and all future
- * interactions with the mint will be checked to be signed
- * (where appropriate) by the respective master key.
- *
- * @param ctx the context
- * @param url HTTP base URL for the mint
- * @param cert_cb function to call with the mint's certification information
- * @param cert_cb_cls closure for @a cert_cb
- * @param ... list of additional arguments, terminated by #TALER_MINT_OPTION_END.
- * @return the mint handle; NULL upon error
- */
-struct TALER_MINT_Handle *
-TALER_MINT_connect (struct TALER_MINT_Context *ctx,
-                    const char *url,
-                    TALER_MINT_CertificationCallback cert_cb,
-                    void *cert_cb_cls,
-                    ...);
-
-
-/**
- * Disconnect from the mint.
- *
- * @param mint the mint handle
- */
-void
-TALER_MINT_disconnect (struct TALER_MINT_Handle *mint);
-
-
-/**
- * Obtain the keys from the mint.
- *
- * @param mint the mint handle
- * @return the mint's key set
- */
-const struct TALER_MINT_Keys *
-TALER_MINT_get_keys (const struct TALER_MINT_Handle *mint);
-
-
-/**
- * Test if the given @a pub is a the current signing key from the mint
- * according to @a keys.
- *
- * @param keys the mint's key set
- * @param pub claimed current online signing key for the mint
- * @return #GNUNET_OK if @a pub is (according to /keys) a current signing key
- */
-int
-TALER_MINT_test_signing_key (const struct TALER_MINT_Keys *keys,
-                             const struct TALER_MintPublicKeyP *pub);
-
-
-/**
- * Obtain the denomination key details from the mint.
- *
- * @param keys the mint's key set
- * @param pk public key of the denomination to lookup
- * @return details about the given denomination key, NULL if the key is not
- * found
- */
-const struct TALER_MINT_DenomPublicKey *
-TALER_MINT_get_denomination_key (const struct TALER_MINT_Keys *keys,
-                                 const struct TALER_DenominationPublicKey *pk);
-
-
-/**
- * Obtain the denomination key details from the mint.
- *
- * @param keys the mint's key set
- * @param hc hash of the public key of the denomination to lookup
- * @return details about the given denomination key
- */
-const struct TALER_MINT_DenomPublicKey *
-TALER_MINT_get_denomination_key_by_hash (const struct TALER_MINT_Keys *keys,
-                                         const struct GNUNET_HashCode *hc);
-
-
-/* *********************  /wire *********************** */
-
-
-/**
- * @brief A Wire format inquiry handle
- */
-struct TALER_MINT_WireHandle;
-
-
-/**
- * Callbacks of this type are used to serve the result of submitting a
- * wire format inquiry request to a mint.
- *
- * The callback is invoked multiple times, once for each supported @a
- * method.  Finally, it is invoked one more time with cls/0/NULL/NULL
- * to indicate the end of the iteration.  If any request fails to
- * generate a valid response from the mint, @a http_status will also
- * be zero and the iteration will also end.  Thus, the iteration
- * always ends with a final call with an @a http_status of 0. If the
- * @a http_status is already 0 on the first call, then the response to
- * the /wire request was invalid.  Later, clients can tell the
- * difference between @a http_status of 0 indicating a failed
- * /wire/method request and a regular end of the iteration by @a
- * method being non-NULL.  If the mint simply correctly asserts that
- * it does not support any methods, @a method will be NULL but the @a
- * http_status will be #MHD_HTTP_OK for the first call (followed by a
- * cls/0/NULL/NULL call to signal the end of the iteration).
- *
- * @param cls closure
- * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful request;
- *                    0 if the mint's reply is bogus (fails to follow the protocol)
- * @param method wire format method supported, i.e. "test" or "sepa", or NULL
- *            if already the /wire request failed.
- * @param obj the received JSON reply, if successful this should be the wire
- *            format details as provided by /wire/METHOD/, or NULL if the
- *            reply was not in JSON format (in this case, the client might
- *            want to do an HTTP request to /wire/METHOD/ with a browser to
- *            provide more information to the user about the @a method).
- */
-typedef void
-(*TALER_MINT_WireResultCallback) (void *cls,
-                                  unsigned int http_status,
-                                  const char *method,
-                                  json_t *obj);
-
-
-/**
- * Obtain information about a mint's wire instructions.
- * A mint may provide wire instructions for creating
- * a reserve.  The wire instructions also indicate
- * which wire formats merchants may use with the mint.
- * This API is typically used by a wallet for wiring
- * funds, and possibly by a merchant to determine
- * supported wire formats.
- *
- * Note that while we return the (main) response verbatim to the
- * caller for further processing, we do already verify that the
- * response is well-formed (i.e. that signatures included in the
- * response are all valid).  If the mint's reply is not well-formed,
- * we return an HTTP status code of zero to @a cb.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param wire_cb the callback to call when a reply for this request is available
- * @param wire_cb_cls closure for the above callback
- * @return a handle for this request
- */
-struct TALER_MINT_WireHandle *
-TALER_MINT_wire (struct TALER_MINT_Handle *mint,
-                 TALER_MINT_WireResultCallback wire_cb,
-                 void *wire_cb_cls);
-
-
-/**
- * Cancel a wire information request.  This function cannot be used
- * on a request handle if a response is already served for it.
- *
- * @param wh the wire information request handle
- */
-void
-TALER_MINT_wire_cancel (struct TALER_MINT_WireHandle *wh);
-
-
-/* *********************  /deposit *********************** */
-
-
-/**
- * @brief A Deposit Handle
- */
-struct TALER_MINT_DepositHandle;
-
-
-/**
- * Callbacks of this type are used to serve the result of submitting a
- * deposit permission request to a mint.
- *
- * @param cls closure
- * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful deposit;
- *                    0 if the mint's reply is bogus (fails to follow the protocol)
- * @param obj the received JSON reply, should be kept as proof (and, in case of errors,
- *            be forwarded to the customer)
- */
-typedef void
-(*TALER_MINT_DepositResultCallback) (void *cls,
-                                     unsigned int http_status,
-                                     json_t *obj);
-
-
-/**
- * Submit a deposit permission to the mint and get the mint's
- * response.  This API is typically used by a merchant.  Note that
- * while we return the response verbatim to the caller for further
- * processing, we do already verify that the response is well-formed
- * (i.e. that signatures included in the response are all valid).  If
- * the mint's reply is not well-formed, we return an HTTP status code
- * of zero to @a cb.
- *
- * We also verify that the @a coin_sig is valid for this deposit
- * request, and that the @a ub_sig is a valid signature for @a
- * coin_pub.  Also, the @a mint must be ready to operate (i.e.  have
- * finished processing the /keys reply).  If either check fails, we do
- * NOT initiate the transaction with the mint and instead return NULL.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param amount the amount to be deposited
- * @param wire_deadline execution date, until which the merchant would like the mint to settle the balance (advisory, the mint cannot be
- *        forced to settle in the past or upon very short notice, but of course a well-behaved mint will limit aggregation based on the advice received)
- * @param wire_details the merchant’s account details, in a format supported by the mint
- * @param h_contract hash of the contact of the merchant with the customer (further details are never disclosed to the mint)
- * @param coin_pub coin’s public key
- * @param denom_pub denomination key with which the coin is signed
- * @param denom_sig mint’s unblinded signature of the coin
- * @param timestamp timestamp when the contract was finalized, must match approximately the current time of the mint
- * @param transaction_id transaction id for the transaction between merchant and customer
- * @param merchant_pub the public key of the merchant (used to identify the merchant for refund requests)
- * @param refund_deadline date until which the merchant can issue a refund to the customer via the mint (can be zero if refunds are not allowed)
- * @param coin_sig the signature made with purpose #TALER_SIGNATURE_WALLET_COIN_DEPOSIT made by the customer with the coin’s private key.
- * @param cb the callback to call when a reply for this request is available
- * @param cb_cls closure for the above callback
- * @return a handle for this request; NULL if the inputs are invalid (i.e.
- *         signatures fail to verify).  In this case, the callback is not called.
- */
-struct TALER_MINT_DepositHandle *
-TALER_MINT_deposit (struct TALER_MINT_Handle *mint,
-                    const struct TALER_Amount *amount,
-                    struct GNUNET_TIME_Absolute wire_deadline,
-                    json_t *wire_details,
-                    const struct GNUNET_HashCode *h_contract,
-                    const struct TALER_CoinSpendPublicKeyP *coin_pub,
-                    const struct TALER_DenominationSignature *denom_sig,
-                    const struct TALER_DenominationPublicKey *denom_pub,
-                    struct GNUNET_TIME_Absolute timestamp,
-                    uint64_t transaction_id,
-                    const struct TALER_MerchantPublicKeyP *merchant_pub,
-                    struct GNUNET_TIME_Absolute refund_deadline,
-                    const struct TALER_CoinSpendSignatureP *coin_sig,
-                    TALER_MINT_DepositResultCallback cb,
-                    void *cb_cls);
-
-
-/**
- * Cancel a deposit permission request.  This function cannot be used
- * on a request handle if a response is already served for it.
- *
- * @param deposit the deposit permission request handle
- */
-void
-TALER_MINT_deposit_cancel (struct TALER_MINT_DepositHandle *deposit);
-
-
-/* ********************* /reserve/status *********************** */
-
-
-/**
- * @brief A /reserve/status Handle
- */
-struct TALER_MINT_ReserveStatusHandle;
-
-
-/**
- * Ways how a reserve's balance may change.
- */
-enum TALER_MINT_ReserveTransactionType {
-
-  /**
-   * Deposit into the reserve.
-   */
-  TALER_MINT_RTT_DEPOSIT,
-
-  /**
-   * Withdrawal from the reserve.
-   */
-  TALER_MINT_RTT_WITHDRAWAL
-
-};
-
-
-/**
- * @brief Entry in the reserve's transaction history.
- */
-struct TALER_MINT_ReserveHistory
-{
-
-  /**
-   * Type of the transaction.
-   */
-  enum TALER_MINT_ReserveTransactionType type;
-
-  /**
-   * Amount transferred (in or out).
-   */
-  struct TALER_Amount amount;
-
-  /**
-   * Details depending on @e type.
-   */
-  union {
-
-    /**
-     * Transaction details for the incoming transaction.
-     */
-    json_t *wire_in_details;
-
-    /**
-     * Signature authorizing the withdrawal for outgoing transaction.
-     */
-    json_t *out_authorization_sig;
-
-  } details;
-
-};
-
-
-/**
- * Callbacks of this type are used to serve the result of submitting a
- * deposit permission request to a mint.
- *
- * @param cls closure
- * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
- *                    0 if the mint's reply is bogus (fails to follow the protocol)
- * @param[in] json original response in JSON format (useful only for diagnostics)
- * @param balance current balance in the reserve, NULL on error
- * @param history_length number of entries in the transaction history, 0 on error
- * @param history detailed transaction history, NULL on error
- */
-typedef void
-(*TALER_MINT_ReserveStatusResultCallback) (void *cls,
-                                           unsigned int http_status,
-                                           json_t *json,
-                                           const struct TALER_Amount *balance,
-                                           unsigned int history_length,
-                                           const struct TALER_MINT_ReserveHistory *history);
-
-
-/**
- * Submit a request to obtain the transaction history of a reserve
- * from the mint.  Note that while we return the full response to the
- * caller for further processing, we do already verify that the
- * response is well-formed (i.e. that signatures included in the
- * response are all valid and add up to the balance).  If the mint's
- * reply is not well-formed, we return an HTTP status code of zero to
- * @a cb.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param reserve_pub public key of the reserve to inspect
- * @param cb the callback to call when a reply for this request is available
- * @param cb_cls closure for the above callback
- * @return a handle for this request; NULL if the inputs are invalid (i.e.
- *         signatures fail to verify).  In this case, the callback is not called.
- */
-struct TALER_MINT_ReserveStatusHandle *
-TALER_MINT_reserve_status (struct TALER_MINT_Handle *mint,
-                           const struct TALER_ReservePublicKeyP *reserve_pub,
-                           TALER_MINT_ReserveStatusResultCallback cb,
-                           void *cb_cls);
-
-
-/**
- * Cancel a withdraw status request.  This function cannot be used
- * on a request handle if a response is already served for it.
- *
- * @param wsh the withdraw status request handle
- */
-void
-TALER_MINT_reserve_status_cancel (struct TALER_MINT_ReserveStatusHandle *wsh);
-
-
-/* ********************* /reserve/withdraw *********************** */
-
-
-/**
- * @brief A /reserve/withdraw Handle
- */
-struct TALER_MINT_ReserveWithdrawHandle;
-
-
-/**
- * Callbacks of this type are used to serve the result of submitting a
- * deposit permission request to a mint.
- *
- * @param cls closure
- * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
- *                    0 if the mint's reply is bogus (fails to follow the protocol)
- * @param sig signature over the coin, NULL on error
- * @param full_response full response from the mint (for logging, in case of errors)
- */
-typedef void
-(*TALER_MINT_ReserveWithdrawResultCallback) (void *cls,
-                                             unsigned int http_status,
-                                             const struct TALER_DenominationSignature *sig,
-                                             json_t *full_response);
-
-
-/**
- * Withdraw a coin from the mint using a /reserve/withdraw request.  This
- * API is typically used by a wallet.  Note that to ensure that no
- * money is lost in case of hardware failures, the caller must have
- * committed (most of) the arguments to disk before calling, and be
- * ready to repeat the request with the same arguments in case of
- * failures.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param pk kind of coin to create
- * @param reserve_priv private key of the reserve to withdraw from
- * @param coin_priv where to store the coin's private key,
- *        caller must have committed this value to disk before the call (with @a pk)
- * @param blinding_key where to store the coin's blinding key
- *        caller must have committed this value to disk before the call (with @a pk)
- * @param res_cb the callback to call when the final result for this request is available
- * @param res_cb_cls closure for @a res_cb
- * @return NULL
- *         if the inputs are invalid (i.e. denomination key not with this mint).
- *         In this case, the callback is not called.
- */
-struct TALER_MINT_ReserveWithdrawHandle *
-TALER_MINT_reserve_withdraw (struct TALER_MINT_Handle *mint,
-                             const struct TALER_MINT_DenomPublicKey *pk,
-                             const struct TALER_ReservePrivateKeyP *reserve_priv,
-                             const struct TALER_CoinSpendPrivateKeyP *coin_priv,
-                             const struct TALER_DenominationBlindingKey *blinding_key,
-                             TALER_MINT_ReserveWithdrawResultCallback res_cb,
-                             void *res_cb_cls);
-
-
-/**
- * Cancel a withdraw status request.  This function cannot be used
- * on a request handle if a response is already served for it.
- *
- * @param sign the withdraw sign request handle
- */
-void
-TALER_MINT_reserve_withdraw_cancel (struct TALER_MINT_ReserveWithdrawHandle *sign);
-
-
-/* ********************* /refresh/melt+reveal ***************************** */
-
-
-/**
- * Melt (partially spent) coins to obtain fresh coins that are
- * unlinkable to the original coin(s).  Note that melting more
- * than one coin in a single request will make those coins linkable,
- * so the safest operation only melts one coin at a time.
- *
- * This API is typically used by a wallet.  Note that to ensure that
- * no money is lost in case of hardware failures, is operation does
- * not actually initiate the request. Instead, it generates a buffer
- * which the caller must store before proceeding with the actual call
- * to #TALER_MINT_refresh_melt() that will generate the request.
- *
- * This function does verify that the given request data is internally
- * consistent.  However, the @a melts_sigs are only verified if @a
- * check_sigs is set to #GNUNET_YES, as this may be relatively
- * expensive and should be redundant.
- *
- * Aside from some non-trivial cryptographic operations that might
- * take a bit of CPU time to complete, this function returns
- * its result immediately and does not start any asynchronous
- * processing.  This function is also thread-safe.
- *
- * @param num_melts number of coins that are being melted (typically 1)
- * @param melt_privs array of @a num_melts private keys of the coins to melt
- * @param melt_amounts array of @a num_melts amounts specifying how much
- *                     each coin will contribute to the melt (including fee)
- * @param melt_sigs array of @a num_melts signatures affirming the
- *                   validity of the public keys corresponding to the
- *                   @a melt_privs private keys
- * @param melt_pks array of @a num_melts denomination key information
- *                   records corresponding to the @a melt_sigs
- *                   validity of the keys
- * @param check_sigs verify the validity of the signatures of @a melt_sigs
- * @param fresh_pks_len length of the @a pks array
- * @param fresh_pks array of @a pks_len denominations of fresh coins to create
- * @param[out] res_size set to the size of the return value, or 0 on error
- * @return NULL
- *         if the inputs are invalid (i.e. denomination key not with this mint).
- *         Otherwise, pointer to a buffer of @a res_size to store persistently
- *         before proceeding to #TALER_MINT_refresh_melt().
- *         Non-null results should be freed using #GNUNET_free().
- */
-char *
-TALER_MINT_refresh_prepare (unsigned int num_melts,
-                            const struct TALER_CoinSpendPrivateKeyP *melt_privs,
-                            const struct TALER_Amount *melt_amounts,
-                            const struct TALER_DenominationSignature *melt_sigs,
-                            const struct TALER_MINT_DenomPublicKey *melt_pks,
-                            int check_sigs,
-                            unsigned int fresh_pks_len,
-                            const struct TALER_MINT_DenomPublicKey *fresh_pks,
-                            size_t *res_size);
-
-
-/* ********************* /refresh/melt ***************************** */
-
-/**
- * @brief A /refresh/melt Handle
- */
-struct TALER_MINT_RefreshMeltHandle;
-
-
-/**
- * Callbacks of this type are used to notify the application about the
- * result of the /refresh/melt stage.  If successful, the @a noreveal_index
- * should be committed to disk prior to proceeding #TALER_MINT_refresh_reveal().
- *
- * @param cls closure
- * @param http_status HTTP response code, never #MHD_HTTP_OK (200) as for successful intermediate response this callback is skipped.
- *                    0 if the mint's reply is bogus (fails to follow the protocol)
- * @param noreveal_index choice by the mint in the cut-and-choose protocol,
- *                    UINT16_MAX on error
- * @param full_response full response from the mint (for logging, in case of errors)
- */
-typedef void
-(*TALER_MINT_RefreshMeltCallback) (void *cls,
-                                   unsigned int http_status,
-                                   uint16_t noreveal_index,
-                                   json_t *full_response);
-
-
-/**
- * Submit a melt request to the mint and get the mint's
- * response.
- *
- * This API is typically used by a wallet.  Note that to ensure that
- * no money is lost in case of hardware failures, the provided
- * argument should have been constructed using
- * #TALER_MINT_refresh_prepare and committed to persistent storage
- * prior to calling this function.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param refresh_data_length size of the @a refresh_data (returned
- *        in the `res_size` argument from #TALER_MINT_refresh_prepare())
- * @param refresh_data the refresh data as returned from
-          #TALER_MINT_refresh_prepare())
- * @param melt_cb the callback to call with the result
- * @param melt_cb_cls closure for @a melt_cb
- * @return a handle for this request; NULL if the argument was invalid.
- *         In this case, neither callback will be called.
- */
-struct TALER_MINT_RefreshMeltHandle *
-TALER_MINT_refresh_melt (struct TALER_MINT_Handle *mint,
-                         size_t refresh_data_length,
-                         const char *refresh_data,
-                         TALER_MINT_RefreshMeltCallback melt_cb,
-                         void *melt_cb_cls);
-
-
-/**
- * Cancel a refresh melt request.  This function cannot be used
- * on a request handle if the callback was already invoked.
- *
- * @param rmh the refresh handle
- */
-void
-TALER_MINT_refresh_melt_cancel (struct TALER_MINT_RefreshMeltHandle *rmh);
-
-
-/* ********************* /refresh/reveal ***************************** */
-
-
-/**
- * Callbacks of this type are used to return the final result of
- * submitting a refresh request to a mint.  If the operation was
- * successful, this function returns the signatures over the coins
- * that were remelted.  The @a coin_privs and @a sigs arrays give the
- * coins in the same order (and should have the same length) in which
- * the original request specified the respective denomination keys.
- *
- * @param cls closure
- * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
- *                    0 if the mint's reply is bogus (fails to follow the protocol)
- * @param num_coins number of fresh coins created, length of the @a sigs and @a coin_privs arrays, 0 if the operation failed
- * @param coin_privs array of @a num_coins private keys for the coins that were created, NULL on error
- * @param sigs array of signature over @a num_coins coins, NULL on error
- * @param full_response full response from the mint (for logging, in case of errors)
- */
-typedef void
-(*TALER_MINT_RefreshRevealCallback) (void *cls,
-                                     unsigned int http_status,
-
-                                     unsigned int num_coins,
-                                     const struct TALER_CoinSpendPrivateKeyP *coin_privs,
-                                     const struct TALER_DenominationSignature *sigs,
-                                     json_t *full_response);
-
-
-/**
- * @brief A /refresh/reveal Handle
- */
-struct TALER_MINT_RefreshRevealHandle;
-
-
-/**
- * Submit a /refresh/reval request to the mint and get the mint's
- * response.
- *
- * This API is typically used by a wallet.  Note that to ensure that
- * no money is lost in case of hardware failures, the provided
- * arguments should have been committed to persistent storage
- * prior to calling this function.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param refresh_data_length size of the @a refresh_data (returned
- *        in the `res_size` argument from #TALER_MINT_refresh_prepare())
- * @param refresh_data the refresh data as returned from
-          #TALER_MINT_refresh_prepare())
- * @param noreveal_index response from the mint to the
- *        #TALER_MINT_refresh_melt() invocation
- * @param reveal_cb the callback to call with the final result of the
- *        refresh operation
- * @param reveal_cb_cls closure for the above callback
- * @return a handle for this request; NULL if the argument was invalid.
- *         In this case, neither callback will be called.
- */
-struct TALER_MINT_RefreshRevealHandle *
-TALER_MINT_refresh_reveal (struct TALER_MINT_Handle *mint,
-                           size_t refresh_data_length,
-                           const char *refresh_data,
-                           uint16_t noreveal_index,
-                           TALER_MINT_RefreshRevealCallback reveal_cb,
-                           void *reveal_cb_cls);
-
-
-/**
- * Cancel a refresh reveal request.  This function cannot be used
- * on a request handle if the callback was already invoked.
- *
- * @param rrh the refresh reval handle
- */
-void
-TALER_MINT_refresh_reveal_cancel (struct TALER_MINT_RefreshRevealHandle *rrh);
-
-
-/* ********************* /refresh/link ***************************** */
-
-
-/**
- * @brief A /refresh/link Handle
- */
-struct TALER_MINT_RefreshLinkHandle;
-
-
-/**
- * Callbacks of this type are used to return the final result of
- * submitting a /refresh/link request to a mint.  If the operation was
- * successful, this function returns the signatures over the coins
- * that were created when the original coin was melted.
- *
- * @param cls closure
- * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
- *                    0 if the mint's reply is bogus (fails to follow the protocol)
- * @param num_coins number of fresh coins created, length of the @a sigs and @a coin_privs arrays, 0 if the operation failed
- * @param coin_privs array of @a num_coins private keys for the coins that were created, NULL on error
- * @param sigs array of signature over @a num_coins coins, NULL on error
- * @param pubs array of public keys for the @a sigs, NULL on error
- * @param full_response full response from the mint (for logging, in case of errors)
- */
-typedef void
-(*TALER_MINT_RefreshLinkCallback) (void *cls,
-                                   unsigned int http_status,
-                                   unsigned int num_coins,
-                                   const struct TALER_CoinSpendPrivateKeyP *coin_privs,
-                                   const struct TALER_DenominationSignature *sigs,
-                                   const struct TALER_DenominationPublicKey *pubs,
-                                   json_t *full_response);
-
-
-/**
- * Submit a link request to the mint and get the mint's response.
- *
- * This API is typically not used by anyone, it is more a threat
- * against those trying to receive a funds transfer by abusing the
- * /refresh protocol.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param coin_priv private key to request link data for
- * @param link_cb the callback to call with the useful result of the
- *        refresh operation the @a coin_priv was involved in (if any)
- * @param link_cb_cls closure for @a link_cb
- * @return a handle for this request
- */
-struct TALER_MINT_RefreshLinkHandle *
-TALER_MINT_refresh_link (struct TALER_MINT_Handle *mint,
-                         const struct TALER_CoinSpendPrivateKeyP *coin_priv,
-                         TALER_MINT_RefreshLinkCallback link_cb,
-                         void *link_cb_cls);
-
-
-/**
- * Cancel a refresh link request.  This function cannot be used
- * on a request handle if the callback was already invoked.
- *
- * @param rlh the refresh link handle
- */
-void
-TALER_MINT_refresh_link_cancel (struct TALER_MINT_RefreshLinkHandle *rlh);
-
-
-/* ********************* /admin/add/incoming *********************** */
-
-
-/**
- * @brief A /admin/add/incoming Handle
- */
-struct TALER_MINT_AdminAddIncomingHandle;
-
-
-/**
- * Callbacks of this type are used to serve the result of submitting
- * information about an incoming transaction to a mint.
- *
- * @param cls closure
- * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
- *                    0 if the mint's reply is bogus (fails to follow the protocol)
- * @param full_response full response from the mint (for logging, in case of errors)
- */
-typedef void
-(*TALER_MINT_AdminAddIncomingResultCallback) (void *cls,
-                                              unsigned int http_status,
-                                              json_t *full_response);
-
-
-/**
- * Notify the mint that we have received an incoming transaction
- * which fills a reserve.  Note that this API is an administrative
- * API and thus not accessible to typical mint clients, but only
- * to the operators of the mint.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param reserve_pub public key of the reserve
- * @param amount amount that was deposited
- * @param execution_date when did we receive the amount
- * @param wire wire details
- * @param res_cb the callback to call when the final result for this request is available
- * @param res_cb_cls closure for the above callback
- * @return NULL
- *         if the inputs are invalid (i.e. invalid amount).
- *         In this case, the callback is not called.
- */
-struct TALER_MINT_AdminAddIncomingHandle *
-TALER_MINT_admin_add_incoming (struct TALER_MINT_Handle *mint,
-                               const struct TALER_ReservePublicKeyP *reserve_pub,
-                               const struct TALER_Amount *amount,
-                               struct GNUNET_TIME_Absolute execution_date,
-                               const json_t *wire,
-                               TALER_MINT_AdminAddIncomingResultCallback res_cb,
-                               void *res_cb_cls);
-
-
-/**
- * Cancel an add incoming.  This function cannot be used on a request
- * handle if a response is already served for it.
- *
- * @param aai the admin add incoming request handle
- */
-void
-TALER_MINT_admin_add_incoming_cancel (struct TALER_MINT_AdminAddIncomingHandle *aai);
-
-
-/* ********************* /wire/deposits *********************** */
-
-/**
- * @brief A /wire/deposits Handle
- */
-struct TALER_MINT_WireDepositsHandle;
-
-
-/**
- * Details for one of the /deposit operations that the
- * mint combined into a single wire transfer.
- */
-struct TALER_WireDepositDetails
-{
-  /**
-   * Hash of the contract.
-   */
-  struct GNUNET_HashCode h_contract;
-
-  /**
-   * Which coin was deposited?
-   */
-  struct TALER_CoinSpendPublicKeyP coin_pub;
-
-  /**
-   * Value of the deposit (including fee).
-   */
-  struct TALER_Amount coin_value;
-
-  /**
-   * Fee charged by the mint for the deposit.
-   */
-  struct TALER_Amount coin_fee;
-
-  /**
-   * Merchant's transaction identifier.
-   */
-  uint64_t transaction_id;
-
-};
-
-
-/**
- * Function called with detailed wire transfer data, including all
- * of the coin transactions that were combined into the wire transfer.
- *
- * @param cls closure
- * @param http_status HTTP status code we got, 0 on mint protocol violation
- * @param json original json reply (may include signatures, those have then been
- *        validated already)
- * @param wtid extracted wire transfer identifier, or NULL if the mint could
- *             not provide any (set only if @a http_status is #MHD_HTTP_OK)
- * @param total_amount total amount of the wire transfer, or NULL if the mint could
- *             not provide any @a wtid (set only if @a http_status is #MHD_HTTP_OK)
- * @param details_length length of the @a details array
- * @param details array with details about the combined transactions
- */
-typedef void
-(*TALER_MINT_WireDepositsCallback)(void *cls,
-                                   unsigned int http_status,
-                                   json_t *json,
-                                   const struct GNUNET_HashCode *h_wire,
-                                   const struct TALER_Amount *total_amount,
-                                   unsigned int details_length,
-                                   const struct TALER_WireDepositDetails *details);
-
-
-/**
- * Query the mint about which transactions were combined
- * to create a wire transfer.
- *
- * @param mint mint to query
- * @param wtid raw wire transfer identifier to get information about
- * @param cb callback to call
- * @param cb_cls closure for @a cb
- * @return handle to cancel operation
- */
-struct TALER_MINT_WireDepositsHandle *
-TALER_MINT_wire_deposits (struct TALER_MINT_Handle *mint,
-                          const struct TALER_WireTransferIdentifierRawP *wtid,
-                          TALER_MINT_WireDepositsCallback cb,
-                          void *cb_cls);
-
-
-/**
- * Cancel wire deposits request.  This function cannot be used on a request
- * handle if a response is already served for it.
- *
- * @param wdh the wire deposits request handle
- */
-void
-TALER_MINT_wire_deposits_cancel (struct TALER_MINT_WireDepositsHandle *wdh);
-
-
-/* ********************* /deposit/wtid *********************** */
-
-
-/**
- * @brief A /deposit/wtid Handle
- */
-struct TALER_MINT_DepositWtidHandle;
-
-
-/**
- * Function called with detailed wire transfer data.
- *
- * @param cls closure
- * @param http_status HTTP status code we got, 0 on mint protocol violation
- * @param json original json reply (may include signatures, those have then been
- *        validated already)
- * @param wtid wire transfer identifier used by the mint, NULL if mint did not
- *                  yet execute the transaction
- * @param execution_time actual or planned execution time for the wire transfer
- * @param coin_contribution contribution to the @a total_amount of the deposited coin (may be NULL)
- */
-typedef void
-(*TALER_MINT_DepositWtidCallback)(void *cls,
-                                  unsigned int http_status,
-                                  json_t *json,
-                                  const struct TALER_WireTransferIdentifierRawP *wtid,
-                                  struct GNUNET_TIME_Absolute execution_time,
-                                  const struct TALER_Amount *coin_contribution);
-
-
-/**
- * Obtain the wire transfer details for a given deposit.
- *
- * @param mint the mint to query
- * @param merchant_priv the merchant's private key
- * @param h_wire hash of merchant's wire transfer details
- * @param h_contract hash of the contract
- * @param coin_pub public key of the coin
- * @param transaction_id transaction identifier
- * @param cb function to call with the result
- * @param cb_cls closure for @a cb
- * @return handle to abort request
- */
-struct TALER_MINT_DepositWtidHandle *
-TALER_MINT_deposit_wtid (struct TALER_MINT_Handle *mint,
-                         const struct TALER_MerchantPrivateKeyP *merchant_priv,
-                         const struct GNUNET_HashCode *h_wire,
-                         const struct GNUNET_HashCode *h_contract,
-                         const struct TALER_CoinSpendPublicKeyP *coin_pub,
-                         uint64_t transaction_id,
-                         TALER_MINT_DepositWtidCallback cb,
-                         void *cb_cls);
-
-
-/**
- * Cancel deposit wtid request.  This function cannot be used on a request
- * handle if a response is already served for it.
- *
- * @param dwh the wire deposits request handle
- */
-void
-TALER_MINT_deposit_wtid_cancel (struct TALER_MINT_DepositWtidHandle *dwh);
-
-
-#endif  /* _TALER_MINT_SERVICE_H */