From f767fc29fb0c192d20308a09aaa18918ac8a0875 Mon Sep 17 00:00:00 2001
From: Luke Bratch <luke@bratch.co.uk>
Date: Sun, 19 May 2019 18:37:27 +0100
Subject: Enable logging of TOPIC changes.

---
 blabouncer.c |  8 +++++++-
 logging.c    | 31 ++++++++++++++++++++++++++-----
 logging.h    | 11 +++++++----
 3 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/blabouncer.c b/blabouncer.c
index 4173914..859d3af 100644
--- a/blabouncer.c
+++ b/blabouncer.c
@@ -2,7 +2,6 @@
 // - Perhaps rename clients.ssl and server_ssl since they may not even be OpenSSL sockets
 // - Is it possible to replay JOINs/PARTs?
 // - Move debug output into some debug function
-// - Log TOPICs
 
 // "server" means the real IRC server
 // "client" means bouncer clients
@@ -35,6 +34,7 @@
 #define EXCEPT_NONE 0
 #define LOG_PRIVMSG 0
 #define LOG_JOINPART 1
+#define LOG_TOPIC 2
 
 // It seems to be that *message length* is max 512 bytes, but a socket read from at least UnrealIRCd seems to be up to at least 2416 (+1 for null) bytes.
 // 1208 bytes with OpenSSL, 2416 bytes with plain text.
@@ -801,6 +801,12 @@ int processircmessage(SSL *server_ssl, char *str, int source, struct client *cli
 
           // And then finally relay to all clients
           sendtoallclients(clients, str, sourcefd, settings);
+
+          // Write to normal log if logging enabled
+          if (settings->logging) {
+            logline(str, settings->ircnick, settings->basedir, LOG_TOPIC);
+          }
+
           free(topiccopy);
           free(prefixcopy);
           free(strcopyPtr);
diff --git a/logging.c b/logging.c
index a3fdda4..a4698c6 100644
--- a/logging.c
+++ b/logging.c
@@ -10,11 +10,13 @@
 // If LOG_PRIVMSG then it expects a string in the format:
 // :from!bar@baz PRIVMSG to :hello world
 //
-// If LOG_JOINPART then
-// Expects a string in the format:
-// :nick!bar@baz JOIN :#blabouncer
+// If LOG_JOINPART then it expects a string in the format:
+// :nick!bar@baz JOIN :#channel
 // or
-// :nick!bar@baz PART #blabouncer
+// :nick!bar@baz PART #channel
+//
+// If LOG_TOPIC then it expects a string in the format:
+// :nick!bar@baz TOPIC #channel :bla bla bla
 //
 // With the ":foo!bar@baz "prefix being important for either
 // type.
@@ -42,6 +44,9 @@ int logline(char *str, char *ournick, char *basedir, int type) {
   // If LOG_JOINPART:
   // This gets us the prefix (containing the joined/parted nick), the JOIN/PART command (not needed),
   // and the channel name.
+  // If LOG_TOPIC:
+  // This gets us the prefix (containing the topic setting nick), the TOPIC command (not needed),
+  // the channel whose topic was set, and the rest of the string intact (which is the new topic).
   for (int i = 0; i < 3; i++) {
     // Try to split
     if ((token = strsep(&str, " ")) == NULL) {
@@ -120,6 +125,22 @@ int logline(char *str, char *ournick, char *basedir, int type) {
 
       break;
 
+    case LOG_TOPIC:
+      // Extract the username from the prefix
+      extractnickfromprefix(tokens[0]);
+
+      // Remove the leading ":" from the topic
+      stripprefix(str);
+
+      snprintf(filename, MAXCHAR, "%s/logs/%s.log", basedir, tokens[2]);
+
+      printf("logline(): Logging TOPIC for '%s' in filename '%s'.\n", tokens[2], filename);
+
+      // Build a friendly message (e.g. ":nick!user@host TOPIC #channel :blah blah" -> "nick has changed the topic to: blah blah")
+      snprintf(line, MAXCHAR, "%s has changed the topic to: %s", tokens[0], str);
+
+      break;
+
     default :
       printf("Unknown log type '%d', returning 0.\n", type);
       return 0;
@@ -165,7 +186,7 @@ int logline(char *str, char *ournick, char *basedir, int type) {
       fprintf(stderr, "Error while preparing log string to write!\n");
       exit(1);
     }
-  } else if (type == LOG_JOINPART) {
+  } else if (type == LOG_JOINPART || type == LOG_TOPIC) {
     // Prepend the time string
     char line2[MAXCHAR];
     if (!snprintf(line2, MAXCHAR, "%s %s", timestr, line)) {
diff --git a/logging.h b/logging.h
index 75e6553..012d239 100644
--- a/logging.h
+++ b/logging.h
@@ -18,6 +18,7 @@
 #define SOURCE_CLIENT 1
 #define LOG_PRIVMSG 0
 #define LOG_JOINPART 1
+#define LOG_TOPIC 2
 
 // Write the line 'str' to the relevant log file such as
 // '#channel.log' or 'nickname.log'.  'ournick' is our own
@@ -29,11 +30,13 @@
 // If LOG_PRIVMSG then it expects a string in the format:
 // :from!bar@baz PRIVMSG to :hello world
 //
-// If LOG_JOINPART then
-// Expects a string in the format:
-// :nick!bar@baz JOIN :#blabouncer
+// If LOG_JOINPART then it expects a string in the format:
+// :nick!bar@baz JOIN :#channel
 // or
-// :nick!bar@baz PART #blabouncer
+// :nick!bar@baz PART #channel
+//
+// If LOG_TOPIC then it expects a string in the format:
+// :nick!bar@baz TOPIC #channel :bla bla bla
 //
 // With the ":foo!bar@baz "prefix being important for either
 // type.
-- 
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