/*

 * settings.c   -- Configuration stuff

 *

 * Copyright (C) 2005-2009 Mikael Berthe <mikael@lilotux.net>

 *

 * This program 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 Foundation; either version 2 of the License, or (at

 * your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307

 * USA

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "config.h"

#include "settings.h"

#include "commands.h"

#include "logprint.h"

#include "otr.h"

#include "utils.h"

#include "xmpp.h"

// Maximum line length

// (probably best to use the same value as INPUTLINE_LENGTH)

#define CONFLINE_LENGTH  1024

static GHashTable *option;

static GHashTable *alias;

static GHashTable *binding;

#ifdef HAVE_GPGME     /* PGP settings */

static GHashTable *pgpopt;

typedef struct {

  gchar *pgp_keyid;   /* KeyId the contact is supposed to use */

  guint pgp_disabled; /* If TRUE, PGP is disabled for outgoing messages */

  guint pgp_force;    /* If TRUE, PGP is used w/o negotiation */

} T_pgpopt;

#endif

#ifdef HAVE_LIBOTR

static GHashTable *otrpolicy;

static enum otr_policy default_policy;

#endif

static inline GHashTable *get_hash(guint type)

{

  if      (type == SETTINGS_TYPE_OPTION)  return option;

  else if (type == SETTINGS_TYPE_ALIAS)   return alias;

  else if (type == SETTINGS_TYPE_BINDING) return binding;

#ifdef HAVE_LIBOTR

  else if (type == SETTINGS_TYPE_OTR)     return otrpolicy;

#endif

  return NULL;

}

/* -- */

void settings_init(void)

{

  option  = g_hash_table_new_full(&g_str_hash, &g_str_equal, &g_free, &g_free);

  alias   = g_hash_table_new_full(&g_str_hash, &g_str_equal, &g_free, &g_free);

  binding = g_hash_table_new_full(&g_str_hash, &g_str_equal, &g_free, &g_free);

#ifdef HAVE_GPGME

  pgpopt = g_hash_table_new(&g_str_hash, &g_str_equal);

#endif

#ifdef HAVE_LIBOTR

  otrpolicy = g_hash_table_new(&g_str_hash, &g_str_equal);

#endif

}

//  cfg_read_file(filename, mainfile)

// Read and parse config file "filename".  If filename is NULL,

// try to open the configuration file at the default locations.

// mainfile must be set to TRUE for the startup config file.

// If mainfile is TRUE, the permissions of the configuration file will

// be fixed if they're insecure.

//

int cfg_read_file(char *filename, guint mainfile)

{

  static unsigned int runtime;

  FILE *fp;

  char *buf;

  char *line, *eol;

  unsigned int ln = 0;

  int err = 0;

  if (!filename) {

    // Use default config file locations

    char *home;

    GString *sfilename;

    if (!mainfile) {

      scr_LogPrint(LPRINT_LOGNORM, "No file name provided");

      return -1;

    }

    home = getenv("HOME");

    if (!home) {

      scr_LogPrint(LPRINT_LOG, "Can't find home dir!");

      fprintf(stderr, "Can't find home dir!\n");

      err = -1;

      goto cfg_read_file_return;

    }

    sfilename = g_string_new("");

    g_string_printf(sfilename, "%s/.mcabber/mcabberrc", home);

    if ((fp = fopen(sfilename->str, "r")) == NULL) {

      // 2nd try...

      g_string_printf(sfilename, "%s/.mcabberrc", home);

      if ((fp = fopen(sfilename->str, "r")) == NULL) {

        fprintf(stderr, "Cannot open config file!\n");

        g_string_free(sfilename, TRUE);

        err = -1;

        goto cfg_read_file_return;

      }

    }

    // Check configuration file permissions

    // As it could contain sensitive data, we make it user-readable only.

    checkset_perm(sfilename->str, TRUE);

    scr_LogPrint(LPRINT_LOGNORM, "Reading %s", sfilename->str);

    // Check mcabber dir.  Here we just warn, we don't change the modes.

    g_string_printf(sfilename, "%s/.mcabber/", home);

    checkset_perm(sfilename->str, FALSE);

    g_string_free(sfilename, TRUE);

  } else {

    // filename was specified

    if ((fp = fopen(filename, "r")) == NULL) {

      const char *msg = "Cannot open configuration file";

      if (mainfile)

        perror(msg);

      else

        scr_LogPrint(LPRINT_LOGNORM, "%s (%s).", msg, filename);

      err = -2;

      goto cfg_read_file_return;

    }

    // Check configuration file permissions (see above)

    // We don't change the permissions if that's not the main file.

    if (mainfile)

      checkset_perm(filename, TRUE);

    scr_LogPrint(LPRINT_LOGNORM, "Reading %s", filename);

  }

  buf = g_new(char, CONFLINE_LENGTH+1);

  while (fgets(buf+1, CONFLINE_LENGTH, fp) != NULL) {

    // The first char is reserved to add a '/', to make a command line

    line = buf+1;

    ln++;

    // Strip leading spaces

    while (isspace(*line))

      line++;

    // Make eol point to the last char of the line

    for (eol = line ; *eol ; eol++)

      ;

    if (eol > line)

      eol--;

    // Strip trailing spaces

    while (eol > line && isspace(*eol))

      *eol-- = 0;

    // Ignore empty lines and comments

    if ((*line == '\n') || (*line == '\0') || (*line == '#'))

      continue;

    // We only allow assignments line, except for commands "pgp", "source",

    // "color", "load" and "otrpolicy", unless we're in runtime (i.e. not startup).

    if (runtime ||

        (strchr(line, '=') != NULL)        ||

        startswith(line, "pgp ", FALSE)    ||

        startswith(line, "source ", FALSE) ||

        startswith(line, "color ", FALSE)  ||

#ifdef MODULES_ENABLE

        startswith(line, "load ", FALSE)   ||

#endif

        startswith(line, "otrpolicy", FALSE)) {

      // Only accept a few "safe" commands

      if (!runtime &&

          !startswith(line, "set ", FALSE)    &&

          !startswith(line, "bind ", FALSE)   &&

          !startswith(line, "alias ", FALSE)  &&

          !startswith(line, "pgp ", FALSE)    &&

          !startswith(line, "source ", FALSE) &&

          !startswith(line, "color ", FALSE)  &&

#ifdef MODULES_ENABLE

          !startswith(line, "load ", FALSE)   &&

#endif

          !startswith(line, "otrpolicy ", FALSE)) {

        scr_LogPrint(LPRINT_LOGNORM, "Error in configuration file (l. %d): "

                     "this command can't be used here", ln);

        err++;

        continue;

      }

      // Set the leading COMMAND_CHAR to build a command line

      // and process the command

      *(--line) = COMMAND_CHAR;

      if (process_command(line, TRUE) == 255)

        mcabber_set_terminate_ui();

    } else {

      scr_LogPrint(LPRINT_LOGNORM, "Error in configuration file (l. %d): "

                   "this is not an assignment", ln);

      err++;

    }

  }

  g_free(buf);

  fclose(fp);

  if (filename)

    scr_LogPrint(LPRINT_LOGNORM, "Loaded %s.", filename);

cfg_read_file_return:

  // If we're done with the main file parsing, we can assume that

  // the next time this function is called will be at run time.

  if (mainfile)

    runtime = TRUE;

  return err;

}

//  parse_assigment(assignment, pkey, pval)

// Read assignment and split it to key, value

//

// If this is an assignment, the function will return TRUE and

// set *pkey and *pval (*pval is set to NULL if value field is empty).

//

// If this isn't a assignment (no = char), the function will set *pval

// to NULL and return FALSE.

//

// The caller should g_free() *pkey and *pval (if not NULL) after use.

guint parse_assigment(gchar *assignment, gchar **pkey, gchar **pval)

{

  char *key, *val, *t, *p;

  *pkey = *pval = NULL;

  key = assignment;

  // Remove leading spaces in option name

  while ((!isalnum(*key)) && (*key != '=') && *key) {

    //if (!isblank(*key))

    //  scr_LogPrint("Error in assignment parsing!");

    key++;

  }

  if (!*key) return FALSE; // Empty assignment

  if (*key == '=') {

    //scr_LogPrint("Cannot parse assignment!");

    return FALSE;

  }

  // Ok, key points to the option name

  for (val = key+1 ; *val && (*val != '=') ; val++)

    if (!isalnum(*val) && !isblank(*val) && (*val != '_') && (*val != '-')) {

      // Key should only have alnum chars...

      //scr_LogPrint("Error in assignment parsing!");

      return FALSE;

    }

  // Remove trailing spaces in option name:

  for (t = val-1 ; t > key && isblank(*t) ; t--)

    ;

  // Check for embedded whitespace characters

  for (p = key; p < t; p++) {

    if (isblank(*p)) {

      //scr_LogPrint("Error in assignment parsing!"

      //             " (Name should not contain space chars)");

      return FALSE;

    }

  }

  *pkey = g_strndup(key, t+1-key);

  if (!*val) return FALSE; // Not an assignment

  // Remove leading and trailing spaces in option value:

  for (val++; *val && isblank(*val) ; val++) ;

  for (t = val ; *t ; t++) ;

  for (t-- ; t >= val && isblank(*t) ; t--) ;

  if (t < val) return TRUE; // no value (variable reset for example)

  // If the value begins and ends with quotes ("), these quotes are

  // removed and whitespace is not stripped

  if ((t>val) && (*val == '"' && *t == '"')) {

    val++;

    t--;

  }

  *pval = g_strndup(val, t+1-val);

  return TRUE;

}

void settings_set(guint type, const gchar *key, const gchar *value)

{

  GHashTable *hash;

  hash = get_hash(type);

  if (!hash)

    return;

  if (!value) {

    g_hash_table_remove(hash, key);

  } else {

    g_hash_table_insert(hash, g_strdup(key), g_strdup(value));

  }

}

void settings_del(guint type, const gchar *key)

{

  settings_set(type, key, NULL);

}

const gchar *settings_get(guint type, const gchar *key)

{

  GHashTable *hash;

  hash = get_hash(type);

  if (!hash)

    return NULL;

  return g_hash_table_lookup(hash, key);

}

int settings_get_int(guint type, const gchar *key)

{

  const gchar *setval = settings_get(type, key);

  if (setval) return atoi(setval);

  return 0;

}

//  settings_get_status_msg(status)

// Return a string with the current status message:

// - if there is a user-defined message ("message" option),

//   return this message

// - if there is a user-defined message for the given status (and no

//   generic user message), it is returned

// - if no message is found, return NULL

const gchar *settings_get_status_msg(enum imstatus status)

{

  const gchar *rstatus = settings_opt_get("message");

  if (rstatus) return rstatus;

  switch(status) {

    case available:

        rstatus = settings_opt_get("message_avail");

        break;

    case freeforchat:

        rstatus = settings_opt_get("message_free");

        break;

    case dontdisturb:

        rstatus = settings_opt_get("message_dnd");

        break;

    case notavail:

        rstatus = settings_opt_get("message_notavail");

        break;

    case away:

        rstatus = settings_opt_get("message_away");

        break;

    default: // offline, invisible

        break;

  }

  return rstatus;

}

//  settings_foreach(type, pfunction, param)

// Call pfunction(param, key, value) for each setting with requested type.

void settings_foreach(guint type, void (*pfunc)(char *k, char *v, void *param),

                      void *param)

{

  GHashTable *hash;

  hash = get_hash(type);

  if (!hash)

    return;