src/googlesearch.c

   1 /*
   2  * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
   3  *
   4  * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * Created by Quy Tonthat <qtonthat@gmail.com>
  21  */
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <glib/gprintf.h>
  28 #include <glib/gi18n.h>
  29
  30 #include "viking.h"
  31 #include "curl_download.h"
  32
  33 #define GOOGLE_SEARCH_URL_FMT "http://maps.google.com/maps?q=%s&output=js"
  34 #define GOOGLE_SEARCH_PATTERN_1 "{center:{lat:"
  35 #define GOOGLE_SEARCH_PATTERN_2 ",lng:"
  36 #define GOOGLE_SEARCH_NOT_FOUND "around this map area did not match any locations"
  37
  38 static gchar *last_search_str = NULL;
  39 static VikCoord *last_coord = NULL;
  40 static gchar *last_successful_search_str = NULL;
  41
  42 static DownloadOptions googlesearch_options = { "http://maps.google.com/", 0 };
  43
  44 gchar * a_googlesearch_get_search_string_for_this_place(VikWindow *vw)
  45 {
  46   if (!last_coord)
  47     return NULL;
  48
  49   VikViewport *vvp = vik_window_viewport(vw);
  50   const VikCoord *cur_center = vik_viewport_get_center(vvp);
  51   if (vik_coord_equals(cur_center, last_coord)) {
  52     return(last_successful_search_str);
  53   }
  54   else
  55     return NULL;
  56 }
  57
  58 static gboolean prompt_try_again(VikWindow *vw)
  59 {
  60   GtkWidget *dialog = NULL;
  61   gboolean ret = TRUE;
  62
  63   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  64   gtk_window_set_title(GTK_WINDOW(dialog), _("Search"));
  65
  66   GtkWidget *search_label = gtk_label_new(_("I don't know that place. Do you want another search?"));
  67   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  68   gtk_widget_show_all(dialog);
  69
  70   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT )
  71     ret = FALSE;
  72
  73   gtk_widget_destroy(dialog);
  74   return ret;
  75 }
  76
  77 static gchar *  a_prompt_for_search_string(VikWindow *vw)
  78 {
  79   GtkWidget *dialog = NULL;
  80
  81   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  82   gtk_window_set_title(GTK_WINDOW(dialog), _("Search"));
  83
  84   GtkWidget *search_label = gtk_label_new(_("Enter address or place name:"));
  85   GtkWidget *search_entry = gtk_entry_new();
  86   if (last_search_str)
  87     gtk_entry_set_text(GTK_ENTRY(search_entry), last_search_str);
  88
  89   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  90   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_entry, FALSE, FALSE, 5 );
  91   gtk_widget_show_all(dialog);
  92
  93   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT ) {
  94     gtk_widget_destroy(dialog);
  95     return NULL;
  96   }
  97
  98   gchar *search_str = g_strdup ( gtk_entry_get_text ( GTK_ENTRY(search_entry) ) );
  99
 100   gtk_widget_destroy(dialog);
 101
 102   if (search_str[0] != '\0') {
 103     if (last_search_str)
 104       g_free(last_search_str);
 105     last_search_str = g_strdup(search_str);
 106   }
 107
 108   return(search_str);   /* search_str needs to be freed by caller */
 109 }
 110
 111 static gboolean parse_file_for_latlon(gchar *file_name, struct LatLon *ll)
 112 {
 113   gchar *text, *pat;
 114   GMappedFile *mf;
 115   gsize len;
 116   gboolean found = TRUE;
 117   gchar lat_buf[32], lon_buf[32];
 118   gchar *s;
 119
 120   lat_buf[0] = lon_buf[0] = '\0';
 121
 122   if ((mf = g_mapped_file_new(file_name, FALSE, NULL)) == NULL) {
 123     g_critical(_("couldn't map temp file\n"));
 124     exit(1);
 125   }
 126   len = g_mapped_file_get_length(mf);
 127   text = g_mapped_file_get_contents(mf);
 128
 129   if (g_strstr_len(text, len, GOOGLE_SEARCH_NOT_FOUND) != NULL) {
 130     found = FALSE;
 131     goto done;
 132   }
 133
 134   if ((pat = g_strstr_len(text, len, GOOGLE_SEARCH_PATTERN_1)) == NULL) {
 135     found = FALSE;
 136     goto done;
 137   }
 138   pat += strlen(GOOGLE_SEARCH_PATTERN_1);
 139   s = lat_buf;
 140   if (*pat == '-')
 141     *s++ = *pat++;
 142   while ((s < (lat_buf + sizeof(lat_buf))) && (pat < (text + len)) &&
 143           (g_ascii_isdigit(*pat) || (*pat == '.')))
 144     *s++ = *pat++;
 145   *s = '\0';
 146   if ((pat >= (text + len)) || (lat_buf[0] == '\0')) {
 147     found = FALSE;
 148     goto done;
 149   }
 150
 151   if (strncmp(pat, GOOGLE_SEARCH_PATTERN_2, strlen(GOOGLE_SEARCH_PATTERN_2))) {
 152       found = FALSE;
 153       goto done;
 154   }
 155
 156   pat += strlen(GOOGLE_SEARCH_PATTERN_2);
 157   s = lon_buf;
 158
 159   if (*pat == '-')
 160     *s++ = *pat++;
 161   while ((s < (lon_buf + sizeof(lon_buf))) && (pat < (text + len)) &&
 162           (g_ascii_isdigit(*pat) || (*pat == '.')))
 163     *s++ = *pat++;
 164   *s = '\0';
 165   if ((pat >= (text + len)) || (lon_buf[0] == '\0')) {
 166     found = FALSE;
 167     goto done;
 168   }
 169
 170   ll->lat = g_ascii_strtod(lat_buf, NULL);
 171   ll->lon = g_ascii_strtod(lon_buf, NULL);
 172
 173 done:
 174   g_mapped_file_free(mf);
 175   return (found);
 176
 177 }
 178
 179 gchar *uri_escape(gchar *str)
 180 {
 181   gchar *esc_str = g_malloc(3*strlen(str));
 182   gchar *dst = esc_str;
 183   gchar *src;
 184
 185   for (src = str; *src; src++) {
 186     if (*src == ' ')
 187      *dst++ = '+';
 188     else if (g_ascii_isalnum(*src))
 189      *dst++ = *src;
 190     else {
 191       g_sprintf(dst, "%%%02X", *src);
 192       dst += 3;
 193     }
 194   }
 195
 196     return(esc_str);
 197 }
 198
 199 static int google_search_get_coord(VikWindow *vw, VikViewport *vvp, gchar *srch_str, VikCoord *coord)
 200 {
 201   FILE *tmp_file;
 202   int tmp_fd;
 203   gchar *tmpname;
 204   gchar *uri;
 205   gchar *escaped_srch_str;
 206   int ret = 0;  /* OK */
 207   struct LatLon ll;
 208
 209   escaped_srch_str = uri_escape(srch_str);
 210
 211   if ((tmp_fd = g_file_open_tmp ("vikgsearch.XXXXXX", &tmpname, NULL)) == -1) {
 212     g_critical(_("couldn't open temp file\n"));
 213     exit(1);
 214   }
 215
 216   tmp_file = fdopen(tmp_fd, "r+");
 217   //uri = g_strdup_printf(GOOGLE_SEARCH_URL_FMT, srch_str);
 218   uri = g_strdup_printf(GOOGLE_SEARCH_URL_FMT, escaped_srch_str);
 219
 220   /* TODO: curl may not be available */
 221   if (curl_download_uri(uri, tmp_file, &googlesearch_options)) {  /* error */
 222     fclose(tmp_file);
 223     ret = -1;
 224     goto done;
 225   }
 226
 227   fclose(tmp_file);
 228   if (!parse_file_for_latlon(tmpname, &ll)) {
 229     ret = -1;
 230     goto done;
 231   }
 232
 233   vik_coord_load_from_latlon ( coord, vik_viewport_get_coord_mode(vvp), &ll );
 234
 235   if (last_coord)
 236     g_free(last_coord);
 237   last_coord = g_malloc(sizeof(VikCoord));
 238   *last_coord = *coord;
 239   if (last_successful_search_str)
 240     g_free(last_successful_search_str);
 241   last_successful_search_str = g_strdup(last_search_str);
 242
 243 done:
 244   g_free(escaped_srch_str);
 245   g_free(uri);
 246   remove(tmpname);
 247   g_free(tmpname);
 248   return ret;
 249 }
 250
 251 void a_google_search(VikWindow *vw, VikLayersPanel *vlp, VikViewport *vvp)
 252 {
 253   VikCoord new_center;
 254   gchar *s_str;
 255   gboolean more = TRUE;
 256
 257   do {
 258     s_str = a_prompt_for_search_string(vw);
 259     if ((!s_str) || (s_str[0] == 0)) {
 260       more = FALSE;
 261     }
 262
 263     else if (!google_search_get_coord(vw, vvp, s_str, &new_center)) {
 264       vik_viewport_set_center_coord(vvp, &new_center);
 265       vik_layers_panel_emit_update(vlp);
 266       more = FALSE;
 267     }
 268     else if (!prompt_try_again(vw))
 269         more = FALSE;
 270     g_free(s_str);
 271   } while (more);
 272 }
 273