Make /sendfile in OTR session configurable

`/otr sendfile on` allows unencrypted file transfer in an OMEMO session.

Regards https://github.com/profanity-im/profanity/pull/1270

src/command/cmd_ac.c

@@ -173,6 +173,7 @@ static Autocomplete bookmark_property_ac;
 static Autocomplete otr_ac;
 static Autocomplete otr_log_ac;
 static Autocomplete otr_policy_ac;
+static Autocomplete otr_sendfile_ac;
 static Autocomplete omemo_ac;
 static Autocomplete omemo_log_ac;
 static Autocomplete omemo_policy_ac;
@@ -605,6 +606,7 @@ cmd_ac_init(void)
     autocomplete_add(otr_ac, "question");
     autocomplete_add(otr_ac, "answer");
     autocomplete_add(otr_ac, "char");
+    autocomplete_add(otr_ac, "sendfile");
 
     otr_log_ac = autocomplete_new();
     autocomplete_add(otr_log_ac, "on");
@@ -616,6 +618,10 @@ cmd_ac_init(void)
     autocomplete_add(otr_policy_ac, "opportunistic");
     autocomplete_add(otr_policy_ac, "always");
 
+    otr_sendfile_ac = autocomplete_new();
+    autocomplete_add(otr_sendfile_ac, "on");
+    autocomplete_add(otr_sendfile_ac, "off");
+
     omemo_ac = autocomplete_new();
     autocomplete_add(omemo_ac, "gen");
     autocomplete_add(omemo_ac, "log");
@@ -1190,6 +1196,7 @@ cmd_ac_reset(ProfWin *window)
     autocomplete_reset(otr_ac);
     autocomplete_reset(otr_log_ac);
     autocomplete_reset(otr_policy_ac);
+    autocomplete_reset(otr_sendfile_ac);
     autocomplete_reset(omemo_ac);
     autocomplete_reset(omemo_log_ac);
     autocomplete_reset(omemo_policy_ac);
@@ -1335,6 +1342,7 @@ cmd_ac_uninit(void)
     autocomplete_free(otr_ac);
     autocomplete_free(otr_log_ac);
     autocomplete_free(otr_policy_ac);
+    autocomplete_free(otr_sendfile_ac);
     autocomplete_free(omemo_ac);
     autocomplete_free(omemo_log_ac);
     autocomplete_free(omemo_policy_ac);
@@ -2234,6 +2242,11 @@ _otr_autocomplete(ProfWin *window, const char *const input, gboolean previous)
         return found;
     }
 
+    found = autocomplete_param_with_ac(input, "/otr sendfile", otr_sendfile_ac, TRUE, previous);
+    if (found) {
+        return found;
+    }
+
     found = autocomplete_param_with_ac(input, "/otr", otr_ac, TRUE, previous);
     if (found) {
         return found;

src/command/cmd_defs.c

@@ -1695,7 +1695,8 @@ static struct cmd_t command_defs[] =
             { "untrust",    cmd_otr_untrust },
             { "secret",     cmd_otr_secret },
             { "question",   cmd_otr_question },
-            { "answer",     cmd_otr_answer })
+            { "answer",     cmd_otr_answer },
+            { "sendfile",   cmd_otr_sendfile })
         CMD_NOMAINFUNC
         CMD_TAGS(
             CMD_TAG_CHAT,
@@ -1712,7 +1713,8 @@ static struct cmd_t command_defs[] =
             "/otr answer <answer>",
             "/otr policy manual|opportunistic|always [<contact>]",
             "/otr log on|off|redact",
-            "/otr char <char>")
+            "/otr char <char>",
+            "/otr sendfile on|off")
         CMD_DESC(
             "Off The Record (OTR) commands to manage keys, and perform OTR encryption during chat sessions.")
         CMD_ARGS(
@@ -1734,7 +1736,8 @@ static struct cmd_t command_defs[] =
             { "policy always <contact>",        "Set the OTR policy to always for a specific contact." },
             { "log on|off",                     "Enable or disable plaintext logging of OTR encrypted messages." },
             { "log redact",                     "Log OTR encrypted messages, but replace the contents with [redacted]. This is the default." },
-            { "char <char>",                    "Set the character to be displayed next to OTR encrypted messages." })
+            { "char <char>",                    "Set the character to be displayed next to OTR encrypted messages." },
+            { "sendfile on|off",                "Allow /sendfile to send unencrypted files while in an OTR session."})
         CMD_EXAMPLES(
             "/otr log off",
             "/otr policy manual",
@@ -2266,7 +2269,7 @@ static struct cmd_t command_defs[] =
             { "policy manual",           "Set the global OMEMO policy to manual, OMEMO sessions must be started manually." },
             { "policy automatic",        "Set the global OMEMO policy to opportunistic, an OMEMO session will be attempted upon starting a conversation." },
             { "policy always",           "Set the global OMEMO policy to always, an error will be displayed if an OMEMO session cannot be initiated upon starting a conversation." },
-            { "sendfile",                "Allow /sendfile to send unencrypted files while in an OMEMO session."},
+            { "sendfile on|off",         "Allow /sendfile to send unencrypted files while in an OMEMO session."},
             { "clear_device_list",       "Clear your own device list on server side. Each client will reannounce itself when connected back."})
         CMD_EXAMPLES(
             "/omemo gen",

src/command/cmd_funcs.c

@@ -4819,7 +4819,7 @@ cmd_sendfile(ProfWin *window, const char *const command, gchar **args)
 
             if ((chatwin->is_omemo && !prefs_get_boolean(PREF_OMEMO_SENDFILE))
                     || (chatwin->pgp_send)
-                    || (chatwin->is_otr)) {
+                    || (chatwin->is_otr && !prefs_get_boolean(PREF_OTR_SENDFILE))) {
                 cons_show_error("Uploading '%s' failed: Encrypted file uploads not yet implemented!", filename);
                 win_println(window, THEME_ERROR, '-', "Sending encrypted files via http_upload is not possible yet.");
                 free(filename);
@@ -4829,7 +4829,8 @@ cmd_sendfile(ProfWin *window, const char *const command, gchar **args)
         }
         case WIN_PRIVATE:
         {
-            break; //we don't support encryption in private muc windows anyway
+            //we don't support encryption in private muc windows
+            break;
         }
         default:
 			cons_show_error("Unsupported window for file transmission.");
@@ -7809,6 +7810,19 @@ cmd_otr_answer(ProfWin *window, const char *const command, gchar **args)
 #endif
 }
 
+gboolean
+cmd_otr_sendfile(ProfWin *window, const char *const command, gchar **args)
+{
+#ifdef HAVE_LIBOTR
+    _cmd_set_boolean_preference(args[1], command, "Sending unencrypted files in an OTR session via /sendfile", PREF_OTR_SENDFILE);
+
+    return TRUE;
+#else
+    cons_show("This version of Profanity has not been built with OTR support enabled");
+    return TRUE;
+#endif
+}
+
 gboolean
 cmd_command_list(ProfWin *window, const char *const command, gchar **args)
 {

src/command/cmd_funcs.h

@@ -201,6 +201,7 @@ gboolean cmd_otr_untrust(ProfWin *window, const char *const command, gchar **arg
 gboolean cmd_otr_secret(ProfWin *window, const char *const command, gchar **args);
 gboolean cmd_otr_question(ProfWin *window, const char *const command, gchar **args);
 gboolean cmd_otr_answer(ProfWin *window, const char *const command, gchar **args);
+gboolean cmd_otr_sendfile(ProfWin *window, const char *const command, gchar **args);
 
 gboolean cmd_wins(ProfWin *window, const char *const command, gchar **args);
 gboolean cmd_wins_unread(ProfWin *window, const char *const command, gchar **args);

src/config/preferences.c

@@ -1790,6 +1790,7 @@ _get_group(preference_t pref)
             return PREF_GROUP_CONNECTION;
         case PREF_OTR_LOG:
         case PREF_OTR_POLICY:
+        case PREF_OTR_SENDFILE:
             return PREF_GROUP_OTR;
         case PREF_PGP_LOG:
             return PREF_GROUP_PGP;
@@ -1916,6 +1917,8 @@ _get_key(preference_t pref)
             return "log";
         case PREF_OTR_POLICY:
             return "policy";
+        case PREF_OTR_SENDFILE:
+            return "sendfile";
         case PREF_LOG_ROTATE:
             return "rotate";
         case PREF_LOG_SHARED:

src/config/preferences.h

@@ -135,6 +135,7 @@ typedef enum {
     PREF_LOG_SHARED,
     PREF_OTR_LOG,
     PREF_OTR_POLICY,
+    PREF_OTR_SENDFILE,
     PREF_RESOURCE_TITLE,
     PREF_RESOURCE_MESSAGE,
     PREF_INPBLOCK_DYNAMIC,

src/ui/console.c

@@ -2070,6 +2070,12 @@ cons_show_otr_prefs(void)
     char ch = prefs_get_otr_char();
     cons_show("OTR char (/otr char)     : %c", ch);
 
+    if (prefs_get_boolean(PREF_OTR_SENDFILE)) {
+        cons_show("Allow sending unencrypted files in an OTR session via /sendfile (/otr sendfile): ON");
+    } else {
+        cons_show("Allow sending unencrypted files in an OTR session via /sendfile (/otr sendfile): OFF");
+    }
+
     cons_alert();
 }