misc cleanup, moving TALER_MINT_config_load to libtalerutil

18 files changed, 400 insertions, 179 deletions

diff --git a/src/include/taler_signatures.h b/src/include/taler_signatures.h
index 90fa421c3..e72c2ed61 100644
--- a/src/include/taler_signatures.h
+++ b/src/include/taler_signatures.h
@@ -29,6 +29,7 @@
 #define TALER_SIGNATURES_H
 
 #include <gnunet/gnunet_util_lib.h>
+#include "taler_util.h"
 
 /**
  * Purpose for signing public keys signed
@@ -141,6 +142,45 @@ struct TALER_WithdrawRequest
 };
 
 
+/**
+ * Format used to generate the signature on a request to deposit
+ * a coin into the account of a merchant.
+ */
+struct TALER_DepositRequest
+{
+  /**
+   * Purpose must be #TALER_SIGNATURE_DEPOSIT
+   */
+  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+
+  /**
+   * Hash over the contract for which this deposit is made.
+   */
+  struct GNUNET_HashCode h_contract;
+
+  /**
+   * Hash over the wiring information of the merchant.
+   */
+  struct GNUNET_HashCode h_wire;
+
+  /**
+   * Merchant-generated transaction ID to detect duplicate
+   * transactions.
+   */
+  uint64_t transaction_id GNUNET_PACKED;
+
+  /**
+   * Amount to be deposited.
+   */
+  struct TALER_AmountNBO amount;
+
+  /**
+   * The coin's public key.
+   */
+  struct GNUNET_CRYPTO_EcdsaPublicKey coin_pub;
+
+};
+
 
 /**
  * FIXME
diff --git a/src/include/taler_util.h b/src/include/taler_util.h
index 2c5faaa52..ab5ee11df 100644
--- a/src/include/taler_util.h
+++ b/src/include/taler_util.h
@@ -73,14 +73,27 @@ void
 TALER_gcrypt_init (void);
 
 
+/**
+ * Load configuration by parsing all configuration
+ * files in the given directory.
+ *
+ * @param base_dir directory with the configuration files
+ * @return NULL on error, otherwise configuration
+ */
+struct GNUNET_CONFIGURATION_Handle *
+TALER_config_load (const char *base_dir);
+
+
+
 /* *********************** Amount management ****************** */
 
 
 /**
  * Number of characters (plus 1 for 0-termination) we use to
- * represent currency names (i.e. EUR, USD, etc.).
+ * represent currency names (i.e. EUR, USD, etc.).  We use
+ * 8 for alignment (!).
  */
-#define TALER_CURRENCY_LEN 4
+#define TALER_CURRENCY_LEN 8
 
 
 GNUNET_NETWORK_STRUCT_BEGIN
@@ -127,7 +140,7 @@ struct TALER_Amount
   /**
    * Currency string, left adjusted and padded with zeros.
    */
-  char currency[4];
+  char currency[TALER_CURRENCY_LEN];
 };
 
 
diff --git a/src/mint/mint.h b/src/mint/mint.h
index 05e966e1c..0a0e00d04 100644
--- a/src/mint/mint.h
+++ b/src/mint/mint.h
@@ -35,6 +35,11 @@
 #define DIR_SIGNKEYS "signkeys"
 #define DIR_DENOMKEYS "denomkeys"
 
+/**
+ * For now, we just do EUR.  Should become configurable
+ * in the future!
+ */
+#define MINT_CURRENCY "EUR"
 
 /**
  * On disk format used for a mint signing key.
@@ -63,7 +68,9 @@ struct TALER_MINT_DenomKeyIssuePriv
 
 
 /**
- * Public information about a coin.
+ * Public information about a coin (including the public key
+ * of the coin, the denomination key and the signature with
+ * the denomination key).
  */
 struct TALER_CoinPublicInfo
 {
@@ -119,6 +126,92 @@ struct CollectableBlindcoin
 
 
 /**
+ * Specification for a /deposit operation.
+ */
+struct Deposit
+{
+  /**
+   * Information about the coin that is being deposited.
+   */
+  struct TALER_CoinPublicInfo coin;
+
+  /**
+   * ECDSA signature affirming that the customer intends
+   * this coin to be deposited at the merchant identified
+   * by @e h_wire in relation to the contract identified
+   * by @e h_contract.
+   */
+  struct GNUNET_CRYPTO_EcdsaSignature csig;
+
+  /**
+   * Public key of the merchant.  Enables later identification
+   * of the merchant in case of a need to rollback transactions.
+   */
+  struct GNUNET_CRYPTO_EddsaPublicKey merchant_pub;
+
+  /**
+   * Hash over the contract between merchant and customer
+   * (remains unknown to the Mint).
+   */
+  struct GNUNET_HashCode h_contract;
+
+  /**
+   * Hash of the (canonical) representation of @e wire, used
+   * to check the signature on the request.  Generated by
+   * the mint from the detailed wire data provided by the
+   * merchant.
+   */
+  struct GNUNET_HashCode h_wire;
+
+  /**
+   * Detailed wire information for executing the transaction.
+   */
+  const json_t *wire;
+
+  /**
+   * Merchant-generated transaction ID to detect duplicate
+   * transactions.
+   */
+  uint64_t transaction_id;
+
+  /**
+   * Fraction of the coin's remaining value to be deposited.
+   * The coin is identified by @e coin_pub.
+   */
+  struct TALER_Amount amount;
+
+  /**
+   * Type of the deposit (also purpose of the signature).  Either
+   * #TALER_SIGNATURE_DEPOSIT or #TALER_SIGNATURE_INCREMENTAL_DEPOSIT.
+   */
+  uint32_t purpose; // FIXME: bad type, use ENUM!
+
+
+};
+
+
+
+/**
+ * FIXME
+ */
+struct KnownCoin
+{
+  struct TALER_CoinPublicInfo public_info;
+
+  /**
+   * Refreshing session, only valid if
+   * is_refreshed==1.
+   */
+  struct GNUNET_CRYPTO_EddsaPublicKey refresh_session_pub;
+
+  struct TALER_Amount expended_balance;
+
+  int is_refreshed;
+
+};
+
+
+/**
  * Global information for a refreshing session.
  */
 struct RefreshSession
@@ -168,6 +261,9 @@ struct RefreshSession
 };
 
 
+
+
+
 /**
  * For each (old) coin being melted, we have a `struct
  * RefreshCommitLink` that allows the user to find the shared secret
@@ -214,89 +310,8 @@ struct RefreshCommitCoin
 };
 
 
-/**
- * FIXME
- */
-struct KnownCoin
-{
-  struct TALER_CoinPublicInfo public_info;
-
-  /**
-   * Refreshing session, only valid if
-   * is_refreshed==1.
-   */
-  struct GNUNET_CRYPTO_EddsaPublicKey refresh_session_pub;
-
-  struct TALER_Amount expended_balance;
 
-  int is_refreshed;
 
-};
-
-
-/**
- * Specification for a /deposit operation.
- */
-struct Deposit
-{
-  /**
-   * Information about the coin that is being deposited.
-   */
-  struct TALER_CoinPublicInfo coin;
-
-  /**
-   * EdDSA signature affirming that the customer intends
-   * this coin to be deposited at the merchant identified
-   * by @e h_wire in relation to the contract identified
-   * by @e h_contract.
-   */
-  struct GNUNET_CRYPTO_EddsaSignature csig;
-
-  /**
-   * Public key of the merchant.  Enables later identification
-   * of the merchant in case of a need to rollback transactions.
-   */
-  struct GNUNET_CRYPTO_EddsaPublicKey merchant_pub;
-
-  /**
-   * Hash over the contract between merchant and customer
-   * (remains unknown to the Mint).
-   */
-  struct GNUNET_HashCode h_contract;
-
-  /**
-   * Hash of the (canonical) representation of @e wire, used
-   * to check the signature on the request.  Generated by
-   * the mint from the detailed wire data provided by the
-   * merchant.
-   */
-  struct GNUNET_HashCode h_wire;
-
-  /**
-   * Detailed wire information for executing the transaction.
-   */
-  const json_t *wire;
-
-  /**
-   * Merchant-generated transaction ID to detect duplicate
-   * transactions.
-   */
-  uint64_t transaction_id;
-
-  /**
-   * Fraction of the coin's remaining value to be deposited.
-   * The coin is identified by @e coin_pub.
-   */
-  struct TALER_AmountNBO amount;
-
-  /**
-   * Type of the deposit (also purpose of the signature).  Either
-   * #TALER_SIGNATURE_DEPOSIT or #TALER_SIGNATURE_INCREMENTAL_DEPOSIT.
-   */
-  uint32_t purpose; // FIXME: bad type, use ENUM!
-
-
-};
 
 
 /**
@@ -412,16 +427,6 @@ TALER_MINT_read_denom_key (const char *filename,
                            struct TALER_MINT_DenomKeyIssuePriv *dki);
 
 
-/**
- * Load the configuration for the mint in the given
- * directory.
- *
- * @param mint_base_dir the mint's base directory
- * @return the mint configuratin, or NULL on error
- */
-struct GNUNET_CONFIGURATION_Handle *
-TALER_MINT_config_load (const char *mint_base_dir);
-
 
 int
 TALER_TALER_DB_extract_amount (PGresult *result,
diff --git a/src/mint/mint_common.c b/src/mint/mint_common.c
index bb55f30c4..f0ee09110 100644
--- a/src/mint/mint_common.c
+++ b/src/mint/mint_common.c
@@ -231,27 +231,11 @@ TALER_MINT_denomkeys_iterate (const char *mint_base_dir,
 }
 
 
-struct GNUNET_CONFIGURATION_Handle *
-TALER_MINT_config_load (const char *mint_base_dir)
-{
-  struct GNUNET_CONFIGURATION_Handle *cfg;
-  char *cfg_dir;
-  int res;
-
-  res = GNUNET_asprintf (&cfg_dir, "%s" DIR_SEPARATOR_STR "config", mint_base_dir);
-  GNUNET_assert (res > 0);
-
-  cfg = GNUNET_CONFIGURATION_create ();
-  res = GNUNET_CONFIGURATION_load_from (cfg, cfg_dir);
-  GNUNET_free (cfg_dir);
-  if (GNUNET_OK != res)
-   return NULL;
-  return cfg;
-}
-
 int
-TALER_TALER_DB_extract_amount_nbo (PGresult *result, unsigned int row,
-                            int indices[3], struct TALER_AmountNBO *denom_nbo)
+TALER_TALER_DB_extract_amount_nbo (PGresult *result,
+                                   unsigned int row,
+                                   int indices[3],
+                                   struct TALER_AmountNBO *denom_nbo)
 {
   if ((indices[0] < 0) || (indices[1] < 0) || (indices[2] < 0))
     return GNUNET_NO;
@@ -270,8 +254,10 @@ TALER_TALER_DB_extract_amount_nbo (PGresult *result, unsigned int row,
 
 
 int
-TALER_TALER_DB_extract_amount (PGresult *result, unsigned int row,
-                        int indices[3], struct TALER_Amount *denom)
+TALER_TALER_DB_extract_amount (PGresult *result,
+                               unsigned int row,
+                               int indices[3],
+                               struct TALER_Amount *denom)
 {
   struct TALER_AmountNBO denom_nbo;
   int res;
diff --git a/src/mint/mint_db.c b/src/mint/mint_db.c
index 4c836bf92..c07490805 100644
--- a/src/mint/mint_db.c
+++ b/src/mint/mint_db.c
@@ -1925,11 +1925,11 @@ TALER_MINT_DB_get_deposit (PGconn *db_conn,
     EXITIF (GNUNET_OK !=
             TALER_DB_extract_result (result, rs, 0));
     EXITIF (GNUNET_OK !=
-            TALER_DB_extract_amount_nbo (result, 0,
-                                         "amount_value",
-                                         "amount_fraction",
-                                         "amount_currency",
-                                         &deposit->amount));
+            TALER_DB_extract_amount (result, 0,
+                                     "amount_value",
+                                     "amount_fraction",
+                                     "amount_currency",
+                                     &deposit->amount));
     deposit->coin.denom_sig
       = GNUNET_CRYPTO_rsa_signature_decode (denom_sig_buf,
                                             denom_sig_buf_size);
diff --git a/src/mint/taler-mint-dbinit.c b/src/mint/taler-mint-dbinit.c
index d877f62c6..3d080b523 100644
--- a/src/mint/taler-mint-dbinit.c
+++ b/src/mint/taler-mint-dbinit.c
@@ -95,7 +95,7 @@ TALER_MINT_init_withdraw_tables (PGconn *conn)
   }
   PQclear (result);
 
-  result = PQexec (conn, 
+  result = PQexec (conn,
                    "CREATE TABLE IF NOT EXISTS refresh_sessions "
                    "("
                    " session_pub BYTEA PRIMARY KEY CHECK (length(session_pub) = 32)"
@@ -113,7 +113,7 @@ TALER_MINT_init_withdraw_tables (PGconn *conn)
   }
   PQclear (result);
 
-  result = PQexec (conn, 
+  result = PQexec (conn,
                    "CREATE TABLE IF NOT EXISTS refresh_order "
                    "( "
                    " session_pub BYTEA NOT NULL REFERENCES refresh_sessions (session_pub)"
@@ -130,7 +130,7 @@ TALER_MINT_init_withdraw_tables (PGconn *conn)
   PQclear (result);
 
 
-  result = PQexec (conn, 
+  result = PQexec (conn,
                    "CREATE TABLE IF NOT EXISTS refresh_commit_link"
                    "("
                    " session_pub BYTEA NOT NULL REFERENCES refresh_sessions (session_pub)"
@@ -150,7 +150,7 @@ TALER_MINT_init_withdraw_tables (PGconn *conn)
   }
   PQclear (result);
 
-  result = PQexec (conn, 
+  result = PQexec (conn,
                    "CREATE TABLE IF NOT EXISTS refresh_commit_coin"
                    "("
                    " session_pub BYTEA NOT NULL REFERENCES refresh_sessions (session_pub) "
@@ -169,7 +169,7 @@ TALER_MINT_init_withdraw_tables (PGconn *conn)
   }
   PQclear (result);
 
-  result = PQexec (conn, 
+  result = PQexec (conn,
                    "CREATE TABLE IF NOT EXISTS refresh_melt"
                    "("
                    " session_pub BYTEA NOT NULL REFERENCES refresh_sessions (session_pub) "
@@ -185,7 +185,7 @@ TALER_MINT_init_withdraw_tables (PGconn *conn)
   }
   PQclear (result);
 
-  result = PQexec (conn, 
+  result = PQexec (conn,
                    "CREATE TABLE IF NOT EXISTS refresh_collectable"
                    "("
                    " session_pub BYTEA NOT NULL REFERENCES refresh_sessions (session_pub) "
@@ -245,7 +245,7 @@ main (int argc, char *const *argv)
     GNUNET_GETOPT_OPTION_END
   };
 
-  if (GNUNET_GETOPT_run ("taler-mint-serve", options, argc, argv) < 0) 
+  if (GNUNET_GETOPT_run ("taler-mint-serve", options, argc, argv) < 0)
     return 1;
 
   GNUNET_assert (GNUNET_OK == GNUNET_log_setup ("taler-mint-dbinit", "INFO", NULL));
@@ -256,7 +256,7 @@ main (int argc, char *const *argv)
     return 1;
   }
 
-  cfg = TALER_MINT_config_load (mint_base_dir);
+  cfg = TALER_config_load (mint_base_dir);
   if (NULL == cfg)
   {
     fprintf (stderr, "Can't load mint configuration.\n");
@@ -282,4 +282,3 @@ main (int argc, char *const *argv)
 
   return 0;
 }
-
diff --git a/src/mint/taler-mint-httpd.c b/src/mint/taler-mint-httpd.c
index ffd97a1ad..cde603168 100644
--- a/src/mint/taler-mint-httpd.c
+++ b/src/mint/taler-mint-httpd.c
@@ -233,7 +233,7 @@ mint_serve_process_config (const char *mint_directory)
   char *master_pub_str;
   char *db_cfg;
 
-  cfg = TALER_MINT_config_load (mint_directory);
+  cfg = TALER_config_load (mint_directory);
   if (NULL == cfg)
   {
     fprintf (stderr,
diff --git a/src/mint/taler-mint-httpd_db.c b/src/mint/taler-mint-httpd_db.c
index fcc6d915f..49c359a89 100644
--- a/src/mint/taler-mint-httpd_db.c
+++ b/src/mint/taler-mint-httpd_db.c
@@ -117,7 +117,7 @@ TALER_MINT_db_execute_deposit (struct MHD_Connection *connection,
 
     /* coin valid but not known => insert into DB */
     known_coin.is_refreshed = GNUNET_NO;
-    known_coin.expended_balance = TALER_amount_ntoh (deposit->amount);
+    known_coin.expended_balance = deposit->amount;
     known_coin.public_info = coin_info;
 
     if (GNUNET_OK != TALER_MINT_DB_insert_known_coin (db_conn, &known_coin))
@@ -419,8 +419,7 @@ mint_amount_native_zero ()
   struct TALER_Amount amount;
 
   memset (&amount, 0, sizeof (amount));
-  // FIXME: load from config
-  memcpy (amount.currency, "EUR", 3);
+  memcpy (amount.currency, MINT_CURRENCY, strlen (MINT_CURRENCY) + 1);
 
   return amount;
 }
diff --git a/src/mint/taler-mint-httpd_deposit.c b/src/mint/taler-mint-httpd_deposit.c
index ed0eca8bb..ee9f76d5d 100644
--- a/src/mint/taler-mint-httpd_deposit.c
+++ b/src/mint/taler-mint-httpd_deposit.c
@@ -23,9 +23,8 @@
  * @author Christian Grothoff
  *
  * TODO:
- * - actually verify coin signature
- * - revisit `struct Deposit` parsing once the struct
- *   has been finalized
+ * - missing 'wire' format check (well-formed SEPA-details)
+ * - ugliy if-construction for deposit type
  */
 #include "platform.h"
 #include <gnunet/gnunet_util_lib.h>
@@ -59,19 +58,25 @@ verify_and_execute_deposit (struct MHD_Connection *connection,
                             const struct Deposit *deposit)
 {
   struct MintKeyState *key_state;
+  struct TALER_DepositRequest dr;
 
-  /* FIXME: verify coin signature! */
-  /*
-  if (GNUNET_OK != GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_DEPOSIT,
-                                                      &deposit->purpose,
-                                                      &deposit->coin_sig,
-                                                      &deposit->coin_pub))
+  dr.purpose.purpose = htonl (TALER_SIGNATURE_DEPOSIT);
+  dr.purpose.size = htonl (sizeof (struct TALER_DepositRequest));
+  dr.h_contract = deposit->h_contract;
+  dr.h_wire = deposit->h_wire;
+  dr.transaction_id = GNUNET_htonll (deposit->transaction_id);
+  dr.amount = TALER_amount_hton (deposit->amount);
+  dr.coin_pub = deposit->coin.coin_pub;
+  if (GNUNET_OK !=
+      GNUNET_CRYPTO_ecdsa_verify (TALER_SIGNATURE_DEPOSIT,
+                                  &dr.purpose,
+                                  &deposit->csig,
+                                  &deposit->coin.coin_pub))
   {
-    resp = json_pack ("{s:s}", "error", "Signature verfication failed");
+    LOG_WARNING ("Invalid signature on /deposit request\n");
     return TALER_MINT_reply_arg_invalid (connection,
                                          "csig");
   }
-  */
 
   key_state = TALER_MINT_key_state_acquire ();
   if (GNUNET_YES !=
@@ -80,10 +85,7 @@ verify_and_execute_deposit (struct MHD_Connection *connection,
   {
     LOG_WARNING ("Invalid coin passed for /deposit\n");
     TALER_MINT_key_state_release (key_state);
-    return TALER_MINT_reply_json_pack (connection,
-                                       MHD_HTTP_NOT_FOUND,
-                                       "{s:s}",
-                                       "error", "Coin is not valid");
+    return TALER_MINT_reply_coin_invalid (connection);
   }
   TALER_MINT_key_state_release (key_state);
 
@@ -101,6 +103,7 @@ verify_and_execute_deposit (struct MHD_Connection *connection,
  * @param root root of the posted JSON
  * @param purpose is this a #TALER_SIGNATURE_DEPOSIT or
  *           #TALER_SIGNATURE_INCREMENTAL_DEPOSIT // FIXME: bad type, use enum!
+ * @param amount how much should be deposited
  * @param wire json describing the wire details (?)
  * @return MHD result code
   */
@@ -108,6 +111,7 @@ static int
 parse_and_handle_deposit_request (struct MHD_Connection *connection,
                                   const json_t *root,
                                   uint32_t purpose,
+                                  const struct TALER_Amount *amount,
                                   const json_t *wire)
 {
   int res;
@@ -155,6 +159,7 @@ parse_and_handle_deposit_request (struct MHD_Connection *connection,
     return TALER_MINT_reply_arg_invalid (connection,
                                          "denom_pub");
   }
+  /* FIXME: check that "wire" is formatted correctly */
   if (NULL == (wire_enc = json_dumps (wire, JSON_COMPACT | JSON_SORT_KEYS)))
   {
     GNUNET_CRYPTO_rsa_public_key_free (deposit.coin.denom_pub);
@@ -172,9 +177,7 @@ parse_and_handle_deposit_request (struct MHD_Connection *connection,
 
   deposit.wire = wire;
   deposit.purpose = purpose;
-
-  // FIXME: deposit.amount not initialized!
-
+  deposit.amount = *amount;
   res = verify_and_execute_deposit (connection,
                                     &deposit);
   GNUNET_CRYPTO_rsa_public_key_free (deposit.coin.denom_pub);
@@ -212,6 +215,8 @@ TALER_MINT_handler_deposit (struct RequestHandler *rh,
   const char *deposit_type;
   int res;
   uint32_t purpose;
+  struct TALER_Amount amount;
+  json_t *f;
 
   res = TALER_MINT_parse_post_json (connection,
                                     connection_cls,
@@ -223,16 +228,35 @@ TALER_MINT_handler_deposit (struct RequestHandler *rh,
   if ( (GNUNET_NO == res) || (NULL == json) )
     return MHD_YES;
   if (-1 == json_unpack (json,
-                         "{s:s, s:o}",
+                         "{s:s, s:o, f:o}",
                          "type", &deposit_type,
-                         "wire", &wire))
+                         "wire", &wire,
+                         "f", &f))
   {
     GNUNET_break_op (0);
+    json_decref (json);
     return TALER_MINT_reply_json_pack (connection,
                                        MHD_HTTP_BAD_REQUEST,
                                        "{s:s}",
                                        "error", "Bad format");
   }
+  res = TALER_MINT_parse_amount_json (connection,
+                                      f,
+                                      &amount);
+  json_decref (f);
+  if (GNUNET_SYSERR == res)
+  {
+    json_decref (wire);
+    json_decref (json);
+    return MHD_NO;
+  }
+  if (GNUNET_NO == res)
+  {
+    json_decref (wire);
+    json_decref (json);
+    return MHD_YES;
+  }
+  /* FIXME: use array search and enum, this is ugly */
   if (0 == strcmp ("DIRECT_DEPOSIT", deposit_type))
     purpose = TALER_SIGNATURE_DEPOSIT;
   else if (0 == strcmp ("INCREMENTAL_DEPOSIT", deposit_type))
@@ -241,6 +265,7 @@ TALER_MINT_handler_deposit (struct RequestHandler *rh,
   {
     GNUNET_break_op (0);
     json_decref (wire);
+    json_decref (json);
     return TALER_MINT_reply_json_pack (connection,
                                        MHD_HTTP_BAD_REQUEST,
                                        "{s:s}",
@@ -249,8 +274,10 @@ TALER_MINT_handler_deposit (struct RequestHandler *rh,
   res = parse_and_handle_deposit_request (connection,
                                           json,
                                           purpose,
+                                          &amount,
                                           wire);
   json_decref (wire);
+  json_decref (json);
   return res;
 }
 
diff --git a/src/mint/taler-mint-httpd_parsing.c b/src/mint/taler-mint-httpd_parsing.c
index c4e28bba7..066f18913 100644
--- a/src/mint/taler-mint-httpd_parsing.c
+++ b/src/mint/taler-mint-httpd_parsing.c
@@ -110,8 +110,8 @@ buffer_deinit (struct Buffer *buf)
  * @param data the data to append
  * @param size the size of @a data
  * @param max_size maximum size that the buffer can grow to
- * @return GNUNET_OK on success,
- *         GNUNET_NO if the buffer can't accomodate for the new data
+ * @return #GNUNET_OK on success,
+ *         #GNUNET_NO if the buffer can't accomodate for the new data
  */
 static int
 buffer_append (struct Buffer *buf,
@@ -153,14 +153,14 @@ buffer_append (struct Buffer *buf,
  * @param upload_data the POST data
  * @param upload_data_size number of bytes in @a upload_data
  * @param json the JSON object for a completed request
- * @returns
- *    GNUNET_YES if json object was parsed or at least
+ * @return
+ *    #GNUNET_YES if json object was parsed or at least
  *               may be parsed in the future (call again);
  *               `*json` will be NULL if we need to be called again,
  *                and non-NULL if we are done.
- *    GNUNET_NO is request incomplete or invalid
+ *    #GNUNET_NO is request incomplete or invalid
  *               (error message was generated)
- *    GNUNET_SYSERR on internal error
+ *    #GNUNET_SYSERR on internal error
  *               (we could not even queue an error message,
  *                close HTTP session with MHD_NO)
  */
@@ -606,6 +606,78 @@ TALER_MINT_release_parsed_data (struct GNUNET_MINT_ParseFieldSpec *spec)
 
 
 /**
+ * Parse amount specified in JSON format.
+ *
+ * @param connection the MHD connection (to report errors)
+ * @param f json specification of the amount
+ * @param amount[OUT] set to the amount specified in @a f
+ * @return
+ *    #GNUNET_YES if parsing was successful
+ *    #GNUNET_NO if json is malformed, error response was generated
+ *    #GNUNET_SYSERR on internal error, error response was not generated
+ */
+int
+TALER_MINT_parse_amount_json (struct MHD_Connection *connection,
+                              json_t *f,
+                              struct TALER_Amount *amount)
+{
+  json_int_t value;
+  json_int_t fraction;
+  const char *currency;
+  struct TALER_Amount a;
+
+  if (-1 == json_unpack (f,
+                         "{s:I, s:I, s:s}",
+                         "value", &value,
+                         "fraction", &fraction,
+                         "currency", &currency))
+  {
+    LOG_WARNING ("Failed to parse JSON amount specification\n");
+    if (MHD_YES !=
+        TALER_MINT_reply_json_pack (connection,
+                                    MHD_HTTP_BAD_REQUEST,
+                                    "{s:s}",
+                                    "error", "Bad format"))
+      return GNUNET_SYSERR;
+    return GNUNET_NO;
+  }
+  if ( (value < 0) ||
+       (fraction < 0) ||
+       (value > UINT32_MAX) ||
+       (fraction > UINT32_MAX) )
+  {
+    LOG_WARNING ("Amount specified not in allowed range\n");
+    if (MHD_YES !=
+        TALER_MINT_reply_json_pack (connection,
+                                    MHD_HTTP_BAD_REQUEST,
+                                    "{s:s}",
+                                    "error", "Amount outside of allowed range"))
+      return GNUNET_SYSERR;
+    return GNUNET_NO;
+  }
+  if (0 != strcmp (currency,
+                   MINT_CURRENCY))
+  {
+    LOG_WARNING ("Currency specified not supported by this mint\n");
+    if (MHD_YES !=
+        TALER_MINT_reply_json_pack (connection,
+                                    MHD_HTTP_BAD_REQUEST,
+                                    "{s:s, s:s}",
+                                    "error", "Currency not supported",
+                                    "currency", currency))
+      return GNUNET_SYSERR;
+    return GNUNET_NO;
+  }
+  a.value = (uint32_t) value;
+  a.fraction = (uint32_t) fraction;
+  GNUNET_assert (strlen (MINT_CURRENCY) < TALER_CURRENCY_LEN);
+  strcpy (a.currency, MINT_CURRENCY);
+  *amount = TALER_amount_normalize (a);
+  return GNUNET_OK;
+}
+
+
+/**
  * Extract base32crockford encoded data from request.
  *
  * Queues an error response to the connection if the parameter is missing or
diff --git a/src/mint/taler-mint-httpd_parsing.h b/src/mint/taler-mint-httpd_parsing.h
index 9c4d8aafe..1c13c9469 100644
--- a/src/mint/taler-mint-httpd_parsing.h
+++ b/src/mint/taler-mint-httpd_parsing.h
@@ -25,6 +25,7 @@
 
 #include <microhttpd.h>
 #include <jansson.h>
+#include "taler_util.h"
 
 
 /**
@@ -216,6 +217,23 @@ TALER_MINT_release_parsed_data (struct GNUNET_MINT_ParseFieldSpec *spec);
 
 
 /**
+ * Parse amount specified in JSON format.
+ *
+ * @param connection the MHD connection (to report errors)
+ * @param f json specification of the amount
+ * @param amount[OUT] set to the amount specified in @a f
+ * @return
+ *    #GNUNET_YES if parsing was successful
+ *    #GNUNET_NO if json is malformed, error response was generated
+ *    #GNUNET_SYSERR on internal error, error response was not generated
+ */
+int
+TALER_MINT_parse_amount_json (struct MHD_Connection *connection,
+                              json_t *f,
+                              struct TALER_Amount *amount);
+
+
+/**
  * Extraxt fixed-size base32crockford encoded data from request.
  *
  * Queues an error response to the connection if the parameter is missing or
diff --git a/src/mint/taler-mint-httpd_responses.c b/src/mint/taler-mint-httpd_responses.c
index 12d4bced7..432772d79 100644
--- a/src/mint/taler-mint-httpd_responses.c
+++ b/src/mint/taler-mint-httpd_responses.c
@@ -125,6 +125,26 @@ TALER_MINT_reply_arg_invalid (struct MHD_Connection *connection,
 
 
 /**
+ * Send a response indicating an invalid coin.  (I.e. the signature
+ * over the public key of the coin does not match a valid signing key
+ * of this mint).
+ *
+ * @param connection the MHD connection to use
+ * @return MHD result code
+ */
+int
+TALER_MINT_reply_coin_invalid (struct MHD_Connection *connection)
+{
+  /* TODO: may want to be more precise in the future and
+     distinguish bogus signatures from bogus public keys. */
+  return TALER_MINT_reply_json_pack (connection,
+                                     MHD_HTTP_NOT_FOUND,
+                                     "{s:s}",
+                                     "error", "Coin is not valid");
+}
+
+
+/**
  * Send a response indicating a missing argument.
  *
  * @param connection the MHD connection to use
diff --git a/src/mint/taler-mint-httpd_responses.h b/src/mint/taler-mint-httpd_responses.h
index 51abd9fb4..471d73bd1 100644
--- a/src/mint/taler-mint-httpd_responses.h
+++ b/src/mint/taler-mint-httpd_responses.h
@@ -78,6 +78,18 @@ TALER_MINT_reply_arg_invalid (struct MHD_Connection *connection,
 
 
 /**
+ * Send a response indicating an invalid coin.  (I.e. the signature
+ * over the public key of the coin does not match a valid signing key
+ * of this mint).
+ *
+ * @param connection the MHD connection to use
+ * @return MHD result code
+ */
+int
+TALER_MINT_reply_coin_invalid (struct MHD_Connection *connection);
+
+
+/**
  * Send a response indicating a missing argument.
  *
  * @param connection the MHD connection to use
diff --git a/src/mint/taler-mint-keycheck.c b/src/mint/taler-mint-keycheck.c
index 419baf501..09f59ab2f 100644
--- a/src/mint/taler-mint-keycheck.c
+++ b/src/mint/taler-mint-keycheck.c
@@ -162,7 +162,7 @@ main (int argc, char *const *argv)
     return 1;
   }
 
-  kcfg = TALER_MINT_config_load (mintdir);
+  kcfg = TALER_config_load (mintdir);
   if (NULL == kcfg)
   {
     fprintf (stderr, "can't load mint configuration\n");
@@ -172,4 +172,3 @@ main (int argc, char *const *argv)
     return 1;
   return 0;
 }
-
diff --git a/src/mint/taler-mint-keyup.c b/src/mint/taler-mint-keyup.c
index 7c35317ce..f8670eb97 100644
--- a/src/mint/taler-mint-keyup.c
+++ b/src/mint/taler-mint-keyup.c
@@ -621,7 +621,7 @@ main (int argc, char *const *argv)
   }
   ROUND_TO_SECS (now, abs_value_us);
 
-  kcfg = TALER_MINT_config_load (mintdir);
+  kcfg = TALER_config_load (mintdir);
   if (NULL == kcfg)
   {
     fprintf (stderr, "can't load mint configuration\n");
diff --git a/src/mint/taler-mint-reservemod.c b/src/mint/taler-mint-reservemod.c
index 3dd94f84b..48a9c88b4 100644
--- a/src/mint/taler-mint-reservemod.c
+++ b/src/mint/taler-mint-reservemod.c
@@ -38,7 +38,7 @@ static PGconn *db_conn;
 /**
  * Create a new or add to existing reserve.
  * Fails if currencies do not match.
- * 
+ *
  * @param denom denomination to add
  *
  * @return ...
@@ -72,7 +72,7 @@ reservemod_add (struct TALER_Amount denom)
       reserve_pub,
       &value,
       &fraction,
-      denom.currency, 
+      denom.currency,
       &exnbo};
     int param_lengths[] = {32, 4, 4, strlen(denom.currency), 8};
     int param_formats[] = {1, 1, 1, 1, 1};
@@ -81,14 +81,14 @@ reservemod_add (struct TALER_Amount denom)
                            " expiration_date )"
                            "values ($1,$2,$3,$4,$5);",
                            5, NULL, (const char **) param_values, param_lengths, param_formats, 1);
-  
+
     if (PGRES_COMMAND_OK != PQresultStatus (result))
     {
       fprintf (stderr, "Insert failed: %s\n", PQresultErrorMessage (result));
       return GNUNET_SYSERR;
     }
-  } 
-  else 
+  }
+  else
   {
     struct TALER_Amount old_denom;
     struct TALER_Amount new_denom;
@@ -125,8 +125,8 @@ reservemod_add (struct TALER_Amount denom)
       return GNUNET_SYSERR;
     }
 
-  } 
-  return GNUNET_OK; 
+  }
+  return GNUNET_OK;
 }
 
 
@@ -159,18 +159,18 @@ main (int argc, char *const *argv)
 
   GNUNET_assert (GNUNET_OK == GNUNET_log_setup ("taler-mint-keycheck", "WARNING", NULL));
 
-  if (GNUNET_GETOPT_run ("taler-mint-keyup", options, argc, argv) < 0) 
+  if (GNUNET_GETOPT_run ("taler-mint-keyup", options, argc, argv) < 0)
     return 1;
   if (NULL == mintdir)
   {
-    fprintf (stderr, "mint directory not given\n"); 
+    fprintf (stderr, "mint directory not given\n");
     return 1;
   }
 
   reserve_pub = GNUNET_new (struct GNUNET_CRYPTO_EddsaPublicKey);
   if ((NULL == reserve_pub_str) ||
       (GNUNET_OK != GNUNET_STRINGS_string_to_data (reserve_pub_str,
-                                                   strlen (reserve_pub_str), 
+                                                   strlen (reserve_pub_str),
                                                    reserve_pub,
                                                    sizeof (struct GNUNET_CRYPTO_EddsaPublicKey))))
   {
@@ -178,7 +178,7 @@ main (int argc, char *const *argv)
     return 1;
   }
 
-  kcfg = TALER_MINT_config_load (mintdir);
+  kcfg = TALER_config_load (mintdir);
   if (NULL == kcfg)
   {
     fprintf (stderr, "can't load mint configuration\n");
@@ -212,4 +212,3 @@ main (int argc, char *const *argv)
   }
   return 0;
 }
-
diff --git a/src/mint/test_mint_deposits.c b/src/mint/test_mint_deposits.c
index 776bc15d2..00664cbbf 100644
--- a/src/mint/test_mint_deposits.c
+++ b/src/mint/test_mint_deposits.c
@@ -104,9 +104,12 @@ run (void *cls, char *const *args, const char *cfgfile,
       htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX));
   deposit->amount.fraction =
       htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX));
-  strcpy (deposit->amount.currency, "EUR");
+  GNUNET_assert (strlen (MINT_CURRENCY) < sizeof (deposit->amount.currency));
+  strcpy (deposit->amount.currency, MINT_CURRENCY);
   /* Copy wireformat */
-  (void) memcpy (deposit->wire, wire, sizeof (wire));
+  memcpy (deposit->wire,
+          wire,
+          sizeof (wire));
   EXITIF (GNUNET_OK != TALER_MINT_DB_insert_deposit (conn,
                                                      deposit));
   EXITIF (GNUNET_OK != TALER_MINT_DB_get_deposit (conn,
diff --git a/src/util/util.c b/src/util/util.c
index 440b49fab..de085d088 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -16,7 +16,7 @@
 
 /**
  * @file util.c
- * @brief Common utility functions
+ * @brief Common utility functions; we might choose to move those to GNUnet at some point
  * @author Sree Harsha Totakura <sreeharsha@totakura.in>
  * @author Florian Dold
  * @author Benedikt Mueller
@@ -60,4 +60,33 @@ TALER_data_to_string_alloc (const void *buf, size_t size)
 }
 
 
+/**
+ * Load configuration by parsing all configuration
+ * files in the given directory.
+ *
+ * @param base_dir directory with the configuration files
+ * @return NULL on error, otherwise configuration
+ */
+struct GNUNET_CONFIGURATION_Handle *
+TALER_config_load (const char *base_dir)
+{
+  struct GNUNET_CONFIGURATION_Handle *cfg;
+  char *cfg_dir;
+  int res;
+
+  res = GNUNET_asprintf (&cfg_dir,
+                         "%s" DIR_SEPARATOR_STR "config",
+                         base_dir);
+  GNUNET_assert (res > 0);
+  cfg = GNUNET_CONFIGURATION_create ();
+  res = GNUNET_CONFIGURATION_load_from (cfg, cfg_dir);
+  GNUNET_free (cfg_dir);
+  if (GNUNET_OK != res)
+   return NULL;
+  return cfg;
+}
+
+
+
+
 /* end of util.c */