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-rw-r--r--src/mint/taler-mint-httpd_db.c329
1 files changed, 329 insertions, 0 deletions
diff --git a/src/mint/taler-mint-httpd_db.c b/src/mint/taler-mint-httpd_db.c
index f3a22911..60218ab6 100644
--- a/src/mint/taler-mint-httpd_db.c
+++ b/src/mint/taler-mint-httpd_db.c
@@ -357,3 +357,332 @@ TALER_MINT_db_execute_withdraw_sign (struct MHD_Connection *connection,
return TALER_MINT_reply_withdraw_sign_success (connection,
&collectable);
}
+
+
+/**
+ * Insert all requested denominations into the db, and compute the
+ * required cost of the denominations, including fees.
+ *
+ * @param connection the connection to send an error response to
+ * @param db_conn the database connection
+ * @param key_state the mint's key state to use
+ * @param session_pub the refresh session public key
+ * @param denom_pubs_count number of entries in @a denom_pubs
+ * @param denom_pubs array of public keys for the refresh
+ * @param r_amount the sum of the cost (value+fee) for
+ * all requested coins
+ * @return FIXME!
+ */
+static int
+refresh_accept_denoms (struct MHD_Connection *connection,
+ PGconn *db_conn,
+ const struct MintKeyState *key_state,
+ const struct GNUNET_CRYPTO_EddsaPublicKey *session_pub,
+ unsigned int denom_pubs_count,
+ const struct TALER_RSA_PublicKeyBinaryEncoded *denom_pubs,
+ struct TALER_Amount *r_amount)
+{
+ unsigned int i;
+ int res;
+ struct TALER_MINT_DenomKeyIssue *dki;
+ struct TALER_Amount cost;
+
+ memset (r_amount, 0, sizeof (struct TALER_Amount));
+ for (i = 0; i < denom_pubs_count; i++)
+ {
+ dki = &(TALER_MINT_get_denom_key (key_state, &denom_pubs[i])->issue);
+ cost = TALER_amount_add (TALER_amount_ntoh (dki->value),
+ TALER_amount_ntoh (dki->fee_withdraw));
+ *r_amount = TALER_amount_add (cost, *r_amount);
+
+
+ /* Insert the requested coin into the DB, so we'll know later
+ * what denomination the request had */
+
+ if (GNUNET_OK !=
+ (res = TALER_MINT_DB_insert_refresh_order (db_conn,
+ i,
+ session_pub,
+ &denom_pubs[i])))
+ return res; // ???
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Get an amount in the mint's currency that is zero.
+ *
+ * @return zero amount in the mint's currency
+ */
+static struct TALER_Amount
+mint_amount_native_zero ()
+{
+ struct TALER_Amount amount;
+
+ memset (&amount, 0, sizeof (amount));
+ // FIXME: load from config
+ memcpy (amount.currency, "EUR", 3);
+
+ return amount;
+}
+
+
+/**
+ * Parse coin melt requests from a JSON object and write them to
+ * the database.
+ *
+ * @param connection the connection to send errors to
+ * @param db_conn the database connection
+ * @param key_state the mint's key state
+ * @param session_pub the refresh session's public key
+ * @param coin_count number of coins in @a coin_public_infos to melt
+ * @param coin_public_infos the coins to melt
+ * @param r_melt_balance FIXME
+ * @return #GNUNET_OK on success,
+ * #GNUNET_NO if an error message was generated,
+ * #GNUNET_SYSERR on internal errors (no response generated)
+ */
+static int
+refresh_accept_melts (struct MHD_Connection *connection,
+ PGconn *db_conn,
+ const struct MintKeyState *key_state,
+ const struct GNUNET_CRYPTO_EddsaPublicKey *session_pub,
+ unsigned int coin_count,
+ const struct TALER_CoinPublicInfo *coin_public_infos,
+ struct TALER_Amount *r_melt_balance)
+{
+ size_t i;
+ int res;
+
+ memset (r_melt_balance, 0, sizeof (struct TALER_Amount));
+
+ for (i = 0; i < coin_count; i++)
+ {
+ struct TALER_MINT_DenomKeyIssue *dki;
+ struct KnownCoin known_coin;
+ // money the customer gets by melting the current coin
+ struct TALER_Amount coin_gain;
+
+ dki = &(TALER_MINT_get_denom_key (key_state, &coin_public_infos[i].denom_pub)->issue);
+
+ if (NULL == dki)
+ return (MHD_YES ==
+ TALER_MINT_reply_json_pack (connection,
+ MHD_HTTP_NOT_FOUND,
+ "{s:s}",
+ "error", "denom not found"))
+ ? GNUNET_NO : GNUNET_SYSERR;
+
+
+ res = TALER_MINT_DB_get_known_coin (db_conn,
+ &coin_public_infos[i].coin_pub,
+ &known_coin);
+
+ if (GNUNET_SYSERR == res)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ if (GNUNET_YES == res)
+ {
+ if (GNUNET_YES == known_coin.is_refreshed)
+ return (MHD_YES ==
+ TALER_MINT_reply_json_pack (connection,
+ MHD_HTTP_NOT_FOUND,
+ "{s:s}",
+ "error",
+ "coin already refreshed"))
+ ? GNUNET_NO : GNUNET_SYSERR;
+ }
+ else
+ {
+ known_coin.expended_balance = mint_amount_native_zero ();
+ known_coin.public_info = coin_public_infos[i];
+ }
+
+ known_coin.is_refreshed = GNUNET_YES;
+ known_coin.refresh_session_pub = *session_pub;
+
+ if (GNUNET_OK != TALER_MINT_DB_upsert_known_coin (db_conn, &known_coin))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ if (GNUNET_OK != TALER_MINT_DB_insert_refresh_melt (db_conn, session_pub, i,
+ &coin_public_infos[i].coin_pub,
+ &coin_public_infos[i].denom_pub))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ coin_gain = TALER_amount_ntoh (dki->value);
+ coin_gain = TALER_amount_subtract (coin_gain, known_coin.expended_balance);
+
+ /* Refuse to refresh when the coin does not have enough money left to
+ * pay the refreshing fees of the coin. */
+
+ if (TALER_amount_cmp (coin_gain, TALER_amount_ntoh (dki->fee_refresh)) < 0)
+ return (MHD_YES ==
+ TALER_MINT_reply_json_pack (connection,
+ MHD_HTTP_NOT_FOUND,
+ "{s:s}",
+ "error", "depleted")) ? GNUNET_NO : GNUNET_SYSERR;
+
+ coin_gain = TALER_amount_subtract (coin_gain, TALER_amount_ntoh (dki->fee_refresh));
+
+ *r_melt_balance = TALER_amount_add (*r_melt_balance, coin_gain);
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Execute a /refresh/melt.
+ *
+ * @param connection the MHD connection to handle
+ * @param refresh_session_pub public key of the refresh session
+ * @param num_new_denoms number of entries in @a denom_pubs
+ * @param denum_pubs ???
+ * @param coin_count number of entries in @a coin_public_infos
+ * @param coin_public_infos information about the coins to melt
+ * @return MHD result code
+ */
+int
+TALER_MINT_db_execute_refresh_melt (struct MHD_Connection *connection,
+ const struct GNUNET_CRYPTO_EddsaPublicKey *refresh_session_pub,
+ unsigned int num_new_denoms,
+ const struct TALER_RSA_PublicKeyBinaryEncoded *denom_pubs,
+ unsigned int coin_count,
+ const struct TALER_CoinPublicInfo *coin_public_infos)
+{
+ struct TALER_Amount requested_cost;
+ struct TALER_Amount melt_balance;
+ struct MintKeyState *key_state;
+ struct RefreshSession session;
+ PGconn *db_conn;
+ int res;
+
+ /* We incrementally update the db with other parameters in a transaction.
+ * The transaction is aborted if some parameter does not validate. */
+
+ /* Send response immediately if we already know the session.
+ * Do _not_ care about fields other than session_pub in this case. */
+
+ if (NULL == (db_conn = TALER_MINT_DB_get_connection ()))
+ {
+ /* FIXME: return error code to MHD! */
+ return MHD_NO;
+ }
+ res = TALER_MINT_DB_get_refresh_session (db_conn,
+ refresh_session_pub,
+ NULL);
+ if (GNUNET_YES == res)
+ {
+ if (GNUNET_OK !=
+ (res = TALER_MINT_DB_get_refresh_session (db_conn,
+ refresh_session_pub,
+ &session)))
+ {
+ // FIXME: send internal error
+ GNUNET_break (0);
+ return MHD_NO;
+ }
+ return TALER_MINT_reply_refresh_melt_success (connection,
+ &session,
+ refresh_session_pub);
+ }
+ if (GNUNET_SYSERR == res)
+ {
+ // FIXME: return 'internal error'?
+ GNUNET_break (0);
+ return MHD_NO;
+ }
+
+
+ if (GNUNET_OK != TALER_MINT_DB_transaction (db_conn))
+ {
+ // FIXME: return 'internal error'?
+ GNUNET_break (0);
+ return MHD_NO;
+ }
+
+ if (GNUNET_OK != TALER_MINT_DB_create_refresh_session (db_conn,
+ refresh_session_pub))
+ {
+ // FIXME: return 'internal error'?
+ GNUNET_break (0);
+ TALER_MINT_DB_rollback (db_conn);
+ return MHD_NO;
+ }
+
+ /* The next two operations must see the same key state,
+ * thus we acquire it here. */
+
+ key_state = TALER_MINT_key_state_acquire ();
+ if (GNUNET_OK !=
+ (res = refresh_accept_denoms (connection, db_conn, key_state,
+ refresh_session_pub,
+ num_new_denoms,
+ denom_pubs,
+ &requested_cost)))
+ {
+ TALER_MINT_key_state_release (key_state);
+ TALER_MINT_DB_rollback (db_conn);
+ return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
+ }
+
+ /* Write old coins to db and sum their value */
+ if (GNUNET_OK !=
+ (res = refresh_accept_melts (connection, db_conn, key_state,
+ refresh_session_pub,
+ coin_count,
+ coin_public_infos,
+ &melt_balance)))
+ {
+ TALER_MINT_key_state_release (key_state);
+ GNUNET_break (GNUNET_OK == TALER_MINT_DB_rollback (db_conn));
+ return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
+ }
+
+ TALER_MINT_key_state_release (key_state);
+
+
+ /* Request is only ok if cost of requested coins
+ * does not exceed value of melted coins. */
+
+ // FIXME: also, consider fees?
+ if (TALER_amount_cmp (melt_balance, requested_cost) < 0)
+ {
+ GNUNET_break (GNUNET_OK == TALER_MINT_DB_rollback (db_conn));
+
+ return TALER_MINT_reply_json_pack (connection,
+ MHD_HTTP_FORBIDDEN,
+ "{s:s}",
+ "error",
+ "not enough coins melted");
+ }
+
+ if (GNUNET_OK != TALER_MINT_DB_commit (db_conn))
+ {
+ GNUNET_break (0);
+ return MHD_NO;
+ }
+ if (GNUNET_OK !=
+ (res = TALER_MINT_DB_get_refresh_session (db_conn,
+ refresh_session_pub,
+ &session)))
+ {
+ // FIXME: send internal error
+ GNUNET_break (0);
+ return MHD_NO;
+ }
+ return TALER_MINT_reply_refresh_melt_success (connection,
+ &session,
+ refresh_session_pub);
+
+
+}