high water mark first

[citadel.git] / citadel / modules / nntp / serv_nntp.c

diff --git a/citadel/modules/nntp/serv_nntp.c b/citadel/modules/nntp/serv_nntp.c
index 9147691a8147e8bf21f8643e77f2d595b49a0ac9..249ae12f0019a786f3b39b76e47b84d1a1daf706 100644 (file)
--- a/citadel/modules/nntp/serv_nntp.c
+++ b/citadel/modules/nntp/serv_nntp.c
@@ -62,7 +62,7 @@
 #include "ctdl_module.h"
 
 
-
+extern long timezone;
 
 /****************** BEGIN UTILITY FUNCTIONS THAT COULD BE MOVED ELSEWHERE LATER **************/
 
@@ -335,39 +335,132 @@ void nntp_authinfo(const char *cmd) {
 }
 
 
+// FIXME move this to a header file
+struct nntp_msglist {
+       int num_msgs;
+       long *msgnums;
+};
 
 
+/*
+ * Utility function to fetch the current list of message numbers in a room
+ */
+struct nntp_msglist nntp_fetch_msglist(struct ctdlroom *qrbuf) {
+       struct nntp_msglist nm;
+       struct cdbdata *cdbfr;
+
+       cdbfr = cdb_fetch(CDB_MSGLISTS, &qrbuf->QRnumber, sizeof(long));
+       if (cdbfr != NULL) {
+               nm.msgnums = (long*)cdbfr->ptr;
+               cdbfr->ptr = NULL;
+               nm.num_msgs = cdbfr->len / sizeof(long);
+               cdbfr->len = 0;
+               cdb_free(cdbfr);
+       } else {
+               nm.num_msgs = 0;
+               nm.msgnums = NULL;
+       }
+       return(nm);
+}
 
-/* 
+
+
+
+
+
+/*
+ * Output a room name (newsgroup name) in the format required for LIST and NEWGROUPS command
+ */
+void output_roomname_in_list_format(struct ctdlroom *qrbuf) {
+       char n_name[1024];
+       struct nntp_msglist nm;
+       long low_water_mark = 0;
+       long high_water_mark = 0;
+
+       room_to_newsgroup(n_name, qrbuf->QRname, sizeof n_name);
+       nm = nntp_fetch_msglist(qrbuf);
+       if ((nm.num_msgs > 0) && (nm.msgnums != NULL)) {
+               low_water_mark = nm.msgnums[0];
+               high_water_mark = nm.msgnums[nm.num_msgs - 1];
+       }
+
+       // FIXME we have hardcoded "n" for "no posting allowed" -- fix when we add posting
+       cprintf("%s %ld %ld n\r\n", n_name, high_water_mark, low_water_mark);
+       if (nm.msgnums != NULL) {
+               free(nm.msgnums);
+       }
+}
+
+
+
+/*
+ * Called once per room by nntp_newgroups() to qualify and possibly output a single room
  */
 void nntp_newgroups_backend(struct ctdlroom *qrbuf, void *data)
 {
        int ra;
        int view;
+       time_t thetime = *(time_t *)data;
 
        CtdlRoomAccess(qrbuf, &CC->user, &ra, &view);
 
+       /*
+        * The "created after <date/time>" heuristics depend on the happy coincidence
+        * that for a very long time we have used a unix timestamp as the room record's
+        * generation number (QRgen).  When this module is merged into the master
+        * source tree we should rename QRgen to QR_create_time or something like that.
+        */
+
        if (ra & UA_KNOWN) {
-               char n_name[1024];
-               room_to_newsgroup(n_name, qrbuf->QRname, sizeof n_name);
-               cprintf("%s\r\n", n_name);
+               if (qrbuf->QRgen >= thetime) {
+                       output_roomname_in_list_format(qrbuf);
+               }
        }
 }
 
 /*
- * Implements the NEWGROUPS command (FIXME not finished)
+ * Implements the NEWGROUPS command
  */
 void nntp_newgroups(const char *cmd) {
        /*
-        * HACK: this works because the 5XX series error codes from citadeli
+        * HACK: this works because the 5XX series error codes from citadel
         * protocol will also be considered error codes by an NNTP client
         */
        if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
 
-       cprintf("231 imma show you everything FIXME\r\n");
+
+       char stringy_date[16];
+       char stringy_time[16];
+       char stringy_gmt[16];
+       struct tm tm;
+       time_t thetime;
+
+       extract_token(stringy_date, cmd, 1, ' ', sizeof stringy_date);
+       extract_token(stringy_time, cmd, 2, ' ', sizeof stringy_time);
+       extract_token(stringy_gmt, cmd, 3, ' ', sizeof stringy_gmt);
+
+       memset(&tm, 0, sizeof tm);
+       if (strlen(stringy_date) == 6) {
+               sscanf(stringy_date, "%2d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
+               tm.tm_year += 100;
+       }
+       else {
+               sscanf(stringy_date, "%4d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
+               tm.tm_year -= 1900;
+       }
+       tm.tm_mon -= 1;         // tm_mon is zero based (0=January)
+       tm.tm_isdst = (-1);     // let the C library figure out whether DST is in effect
+       sscanf(stringy_time, "%2d%2d%2d", &tm.tm_hour, &tm.tm_min ,&tm.tm_sec);
+       thetime = mktime(&tm);
+       if (!strcasecmp(stringy_gmt, "GMT")) {
+               tzset();
+               thetime += timezone;
+       }
+
+
+       cprintf("231 list of new newsgroups follows\r\n");
        CtdlGetUser(&CC->user, CC->curr_user);
-       cprintf("%d Rooms w/o new msgs:\n", LISTING_FOLLOWS);
-       CtdlForEachRoom(nntp_newgroups_backend, NULL);
+       CtdlForEachRoom(nntp_newgroups_backend, &thetime);
        cprintf(".\r\n");
 }
 
@@ -472,3 +565,4 @@ CTDL_MODULE_INIT(nntp)
        /* return our module name for the log */
        return "nntp";
 }
+