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 <stdio.h>
  27 #include <string.h>
  28 #include <glib.h>
  29 #include <glib/gstdio.h>
  30 #include <glib/gprintf.h>
  31 #include <glib/gi18n.h>
  32
  33 #include "viking.h"
  34 #include "curl_download.h"
  35
  36 #define GOOGLE_SEARCH_URL_FMT "http://maps.google.com/maps?q=%s&output=js"
  37 #define GOOGLE_SEARCH_PATTERN_1 "{center:{lat:"
  38 #define GOOGLE_SEARCH_PATTERN_2 ",lng:"
  39 #define GOOGLE_SEARCH_NOT_FOUND "around this map area did not match any locations"
  40
  41 static gchar *last_search_str = NULL;
  42 static VikCoord *last_coord = NULL;
  43 static gchar *last_successful_search_str = NULL;
  44
  45 static DownloadOptions googlesearch_options = { "http://maps.google.com/", 0, a_check_map_file };
  46
  47 gchar * a_googlesearch_get_search_string_for_this_place(VikWindow *vw)
  48 {
  49   if (!last_coord)
  50     return NULL;
  51
  52   VikViewport *vvp = vik_window_viewport(vw);
  53   const VikCoord *cur_center = vik_viewport_get_center(vvp);
  54   if (vik_coord_equals(cur_center, last_coord)) {
  55     return(last_successful_search_str);
  56   }
  57   else
  58     return NULL;
  59 }
  60
  61 static gboolean prompt_try_again(VikWindow *vw)
  62 {
  63   GtkWidget *dialog = NULL;
  64   gboolean ret = TRUE;
  65
  66   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  67   gtk_window_set_title(GTK_WINDOW(dialog), _("Search"));
  68
  69   GtkWidget *search_label = gtk_label_new(_("I don't know that place. Do you want another search?"));
  70   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  71   gtk_widget_show_all(dialog);
  72
  73   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT )
  74     ret = FALSE;
  75
  76   gtk_widget_destroy(dialog);
  77   return ret;
  78 }
  79
  80 static gchar *  a_prompt_for_search_string(VikWindow *vw)
  81 {
  82   GtkWidget *dialog = NULL;
  83
  84   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  85   gtk_window_set_title(GTK_WINDOW(dialog), _("Search"));
  86
  87   GtkWidget *search_label = gtk_label_new(_("Enter address or place name:"));
  88   GtkWidget *search_entry = gtk_entry_new();
  89   if (last_search_str)
  90     gtk_entry_set_text(GTK_ENTRY(search_entry), last_search_str);
  91
  92   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  93   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_entry, FALSE, FALSE, 5 );
  94   gtk_widget_show_all(dialog);
  95
  96   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT ) {
  97     gtk_widget_destroy(dialog);
  98     return NULL;
  99   }
 100
 101   gchar *search_str = g_strdup ( gtk_entry_get_text ( GTK_ENTRY(search_entry) ) );
 102
 103   gtk_widget_destroy(dialog);
 104
 105   if (search_str[0] != '\0') {
 106     if (last_search_str)
 107       g_free(last_search_str);
 108     last_search_str = g_strdup(search_str);
 109   }
 110
 111   return(search_str);   /* search_str needs to be freed by caller */
 112 }
 113
 114 static gboolean parse_file_for_latlon(gchar *file_name, struct LatLon *ll)
 115 {
 116   gchar *text, *pat;
 117   GMappedFile *mf;
 118   gsize len;
 119   gboolean found = TRUE;
 120   gchar lat_buf[32], lon_buf[32];
 121   gchar *s;
 122
 123   lat_buf[0] = lon_buf[0] = '\0';
 124
 125   if ((mf = g_mapped_file_new(file_name, FALSE, NULL)) == NULL) {
 126     g_critical(_("couldn't map temp file"));
 127     exit(1);
 128   }
 129   len = g_mapped_file_get_length(mf);
 130   text = g_mapped_file_get_contents(mf);
 131
 132   if (g_strstr_len(text, len, GOOGLE_SEARCH_NOT_FOUND) != NULL) {
 133     found = FALSE;
 134     goto done;
 135   }
 136
 137   if ((pat = g_strstr_len(text, len, GOOGLE_SEARCH_PATTERN_1)) == NULL) {
 138     found = FALSE;
 139     goto done;
 140   }
 141   pat += strlen(GOOGLE_SEARCH_PATTERN_1);
 142   s = lat_buf;
 143   if (*pat == '-')
 144     *s++ = *pat++;
 145   while ((s < (lat_buf + sizeof(lat_buf))) && (pat < (text + len)) &&
 146           (g_ascii_isdigit(*pat) || (*pat == '.')))
 147     *s++ = *pat++;
 148   *s = '\0';
 149   if ((pat >= (text + len)) || (lat_buf[0] == '\0')) {
 150     found = FALSE;
 151     goto done;
 152   }
 153
 154   if (strncmp(pat, GOOGLE_SEARCH_PATTERN_2, strlen(GOOGLE_SEARCH_PATTERN_2))) {
 155       found = FALSE;
 156       goto done;
 157   }
 158
 159   pat += strlen(GOOGLE_SEARCH_PATTERN_2);
 160   s = lon_buf;
 161
 162   if (*pat == '-')
 163     *s++ = *pat++;
 164   while ((s < (lon_buf + sizeof(lon_buf))) && (pat < (text + len)) &&
 165           (g_ascii_isdigit(*pat) || (*pat == '.')))
 166     *s++ = *pat++;
 167   *s = '\0';
 168   if ((pat >= (text + len)) || (lon_buf[0] == '\0')) {
 169     found = FALSE;
 170     goto done;
 171   }
 172
 173   ll->lat = g_ascii_strtod(lat_buf, NULL);
 174   ll->lon = g_ascii_strtod(lon_buf, NULL);
 175
 176 done:
 177   g_mapped_file_free(mf);
 178   return (found);
 179
 180 }
 181
 182 gchar *uri_escape(gchar *str)
 183 {
 184   gchar *esc_str = g_malloc(3*strlen(str));
 185   gchar *dst = esc_str;
 186   gchar *src;
 187
 188   for (src = str; *src; src++) {
 189     if (*src == ' ')
 190      *dst++ = '+';
 191     else if (g_ascii_isalnum(*src))
 192      *dst++ = *src;
 193     else {
 194       g_sprintf(dst, "%%%02X", *src);
 195       dst += 3;
 196     }
 197   }
 198
 199     return(esc_str);
 200 }
 201
 202 static int google_search_get_coord(VikWindow *vw, VikViewport *vvp, gchar *srch_str, VikCoord *coord)
 203 {
 204   FILE *tmp_file;
 205   int tmp_fd;
 206   gchar *tmpname;
 207   gchar *uri;
 208   gchar *escaped_srch_str;
 209   int ret = 0;  /* OK */
 210   struct LatLon ll;
 211
 212   escaped_srch_str = uri_escape(srch_str);
 213
 214   if ((tmp_fd = g_file_open_tmp ("vikgsearch.XXXXXX", &tmpname, NULL)) == -1) {
 215     g_critical(_("couldn't open temp file"));
 216     exit(1);
 217   }
 218
 219   tmp_file = fdopen(tmp_fd, "r+");
 220   //uri = g_strdup_printf(GOOGLE_SEARCH_URL_FMT, srch_str);
 221   uri = g_strdup_printf(GOOGLE_SEARCH_URL_FMT, escaped_srch_str);
 222
 223   /* TODO: curl may not be available */
 224   if (curl_download_uri(uri, tmp_file, &googlesearch_options)) {  /* error */
 225     fclose(tmp_file);
 226     tmp_file = NULL;
 227     ret = -1;
 228     goto done;
 229   }
 230
 231   fclose(tmp_file);
 232   tmp_file = NULL;
 233   if (!parse_file_for_latlon(tmpname, &ll)) {
 234     ret = -1;
 235     goto done;
 236   }
 237
 238   vik_coord_load_from_latlon ( coord, vik_viewport_get_coord_mode(vvp), &ll );
 239
 240   if (last_coord)
 241     g_free(last_coord);
 242   last_coord = g_malloc(sizeof(VikCoord));
 243   *last_coord = *coord;
 244   if (last_successful_search_str)
 245     g_free(last_successful_search_str);
 246   last_successful_search_str = g_strdup(last_search_str);
 247
 248 done:
 249   g_free(escaped_srch_str);
 250   g_free(uri);
 251   g_remove(tmpname);
 252   g_free(tmpname);
 253   return ret;
 254 }
 255
 256 void a_google_search(VikWindow *vw, VikLayersPanel *vlp, VikViewport *vvp)
 257 {
 258   VikCoord new_center;
 259   gchar *s_str;
 260   gboolean more = TRUE;
 261
 262   do {
 263     s_str = a_prompt_for_search_string(vw);
 264     if ((!s_str) || (s_str[0] == 0)) {
 265       more = FALSE;
 266     }
 267
 268     else if (!google_search_get_coord(vw, vvp, s_str, &new_center)) {
 269       vik_viewport_set_center_coord(vvp, &new_center);
 270       vik_layers_panel_emit_update(vlp);
 271       more = FALSE;
 272     }
 273     else if (!prompt_try_again(vw))
 274         more = FALSE;
 275     g_free(s_str);
 276   } while (more);
 277 }
 278