more comments

src/mint/taler-mint-httpd_db.c

@@ -205,7 +205,8 @@ TALER_MINT_db_execute_deposit (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /withdraw/status.
+ * Execute a /withdraw/status.  Given the public key of a reserve,
+ * return the associated transaction history.
  *
  * @param connection the MHD connection to handle
  * @param reserve_pub public key of the reserve to check
@@ -239,7 +240,10 @@ TALER_MINT_db_execute_withdraw_status (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /withdraw/sign.
+ * Execute a "/withdraw/sign". Given a reserve and a properly signed
+ * request to withdraw a coin, check the balance of the reserve and
+ * if it is sufficient, store the request and return the signed
+ * blinded envelope.
  *
  * @param connection the MHD connection to handle
  * @param reserve public key of the reserve
@@ -603,12 +607,16 @@ refresh_accept_melts (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /refresh/melt.
+ * Execute a "/refresh/melt".  We have been given a list of valid
+ * coins and a request to melt them into the given
+ * @a refresh_session_pub.  Check that the coins all have the
+ * required value left and if so, store that they have been
+ * melted and confirm the melting operation to the client.
  *
  * @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 denum_pubs public keys of the coins we want to withdraw in the end
  * @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
@@ -752,14 +760,22 @@ TALER_MINT_db_execute_refresh_melt (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /refresh/commit.
+ * Execute a "/refresh/commit".  The client is committing to @a kappa
+ * sets of transfer keys, and linkage information for a refresh
+ * operation.  Confirm that the commit matches the melts of an
+ * existing @a refresh_session_pub, store the refresh session commit
+ * data and then return the client a challenge specifying which of the
+ * @a kappa sets of private transfer keys should not be revealed.
  *
  * @param connection the MHD connection to handle
  * @param kappa size of x-dimension of @commit_coin and @commit_link arrays
  * @param num_oldcoins size of y-dimension of @commit_link array
  * @param num_newcoins size of y-dimension of @commit_coin array
- * @param commit_coin
+ * @param commit_coin 2d array of coin commitments (what the mint is to sign
- * @param commit_link
+ *                    once the "/refres/reveal" of cut and choose is done)
+ * @param commit_link 2d array of coin link commitments (what the mint is
+ *                    to return via "/refresh/link" to enable linkage in the
+ *                    future)
  * @return MHD result code
  */
 int
@@ -920,7 +936,11 @@ helper_refresh_reveal_send_response (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /refresh/reveal.
+ * Execute a "/refresh/reveal".  The client is revealing to us the
+ * transfer keys for @a kappa-1 sets of coins.  Verify that the
+ * revealed transfer keys would allow linkage to the blinded coins,
+ * and if so, return the signed coins for corresponding to the set of
+ * coins that was not chosen.
  *
  * @param connection the MHD connection to handle
  * @param refresh_session_pub public key of the refresh session
@@ -1276,7 +1296,9 @@ link_iter (void *cls,
 
 
 /**
- * Execute a /refresh/link.
+ * Execute a "/refresh/link".  Returns the linkage information that
+ * will allow the owner of a coin to follow the refresh trail to
+ * the refreshed coin.
  *
  * @param connection the MHD connection to handle
  * @param coin_pub public key of the coin to link

src/mint/taler-mint-httpd_db.h

@@ -1,6 +1,6 @@
 /*
   This file is part of TALER
-  (C) 2014 Christian Grothoff (and other contributing authors)
+  (C) 2014, 2015 Christian Grothoff (and other contributing authors)
 
   TALER is free software; you can redistribute it and/or modify it under the
   terms of the GNU General Public License as published by the Free Software
@@ -31,7 +31,7 @@
 
 
 /**
- * Execute a /deposit.  The validity of the coin and signature
+ * Execute a "/deposit".  The validity of the coin and signature
  * have already been checked.  The database must now check that
  * the coin is not (double or over) spent, and execute the
  * transaction (record details, generate success or failure response).
@@ -46,7 +46,8 @@ TALER_MINT_db_execute_deposit (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /withdraw/status.
+ * Execute a "/withdraw/status".  Given the public key of a reserve,
+ * return the associated transaction history.
  *
  * @param connection the MHD connection to handle
  * @param reserve_pub public key of the reserve to check
@@ -58,7 +59,10 @@ TALER_MINT_db_execute_withdraw_status (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /withdraw/sign.
+ * Execute a "/withdraw/sign".  Given a reserve and a properly signed
+ * request to withdraw a coin, check the balance of the reserve and
+ * if it is sufficient, store the request and return the signed
+ * blinded envelope.
  *
  * @param connection the MHD connection to handle
  * @param reserve public key of the reserve
@@ -79,7 +83,11 @@ TALER_MINT_db_execute_withdraw_sign (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /refresh/melt.
+ * Execute a "/refresh/melt". We have been given a list of valid
+ * coins and a request to melt them into the given
+ * @a refresh_session_pub.  Check that the coins all have the
+ * required value left and if so, store that they have been
+ * melted and confirm the melting operation to the client.
  *
  * @param connection the MHD connection to handle
  * @param refresh_session_pub public key of the refresh session
@@ -99,16 +107,25 @@ TALER_MINT_db_execute_refresh_melt (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /refresh/commit.
+ * Execute a "/refresh/commit".  The client is committing to @a kappa
+ * sets of transfer keys, and linkage information for a refresh
+ * operation.  Confirm that the commit matches the melts of an
+ * existing @a refresh_session_pub, store the refresh session commit
+ * data and then return the client a challenge specifying which of the
+ * @a kappa sets of private transfer keys should not be revealed.
  *
  * @param connection the MHD connection to handle
  * @param kappa size of x-dimension of @commit_coin and @commit_link arrays
  * @param num_oldcoins size of y-dimension of @commit_coin array
  * @param num_newcoins size of y-dimension of @commit_link array
- * @param commit_coin
+ * @param commit_coin 2d array of coin commitments (what the mint is to sign
- * @param commit_link
+ *                    once the "/refres/reveal" of cut and choose is done)
+ * @param commit_link 2d array of coin link commitments (what the mint is
+ *                    to return via "/refresh/link" to enable linkage in the
+ *                    future)
  * @return MHD result code
  */
+// FIXME: see #3635.
 int
 TALER_MINT_db_execute_refresh_commit (struct MHD_Connection *connection,
                                       const struct GNUNET_CRYPTO_EddsaPublicKey *refresh_session_pub,
@@ -120,7 +137,11 @@ TALER_MINT_db_execute_refresh_commit (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /refresh/reveal.
+ * Execute a "/refresh/reveal".  The client is revealing to us the
+ * transfer keys for @a kappa-1 sets of coins.  Verify that the
+ * revealed transfer keys would allow linkage to the blinded coins,
+ * and if so, return the signed coins for corresponding to the set of
+ * coins that was not chosen.
  *
  * @param connection the MHD connection to handle
  * @param refresh_session_pub public key of the refresh session
@@ -138,7 +159,9 @@ TALER_MINT_db_execute_refresh_reveal (struct MHD_Connection *connection,
 
 
 /**
- * Execute a /refresh/link.
+ * Execute a "/refresh/link".  Returns the linkage information that
+ * will allow the owner of a coin to follow the refresh trail to the
+ * refreshed coin.
  *
  * @param connection the MHD connection to handle
  * @param coin_pub public key of the coin to link
@@ -149,4 +172,5 @@ TALER_MINT_db_execute_refresh_link (struct MHD_Connection *connection,
                                     const struct GNUNET_CRYPTO_EcdsaPublicKey *coin_pub);
 
 
-#endif /* _NEURO_MINT_DB_H */
+#endif
+/* TALER_MINT_HTTPD_DB_H */

src/mint/taler-mint-httpd_refresh.c

@@ -1,6 +1,6 @@
 /*
   This file is part of TALER
-  (C) 2014 GNUnet e.V.
+  (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
@@ -24,8 +24,6 @@
 #include <gnunet/gnunet_util_lib.h>
 #include <jansson.h>
 #include <microhttpd.h>
-#include <libpq-fe.h>
-#include <pthread.h>
 #include "mint.h"
 #include "mint_db.h"
 #include "taler_signatures.h"
@@ -250,7 +248,8 @@ get_and_verify_coin_public_info (struct MHD_Connection *connection,
                                     spec);
   if (GNUNET_OK != ret)
     return ret;
-  /* TODO: include amount of coin value to be melted here!? */
+  /* FIXME: include amount of coin value to be melted here (#3636!) and
+    in what we return!? */
   body.purpose.size = htonl (sizeof (struct RefreshMeltConfirmSignRequestBody));
   body.purpose.purpose = htonl (TALER_SIGNATURE_REFRESH_MELT_CONFIRM);
   body.session_pub = *session_pub;