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 #include <stdlib.h>
  23 #include <string.h>
  24 #include <glib/gprintf.h>
  25
  26 #include "viking.h"
  27 #include "curl_download.h"
  28
  29 #define GOOGLE_SEARCH_URL_FMT "http://maps.google.com/maps?q=%s&output=js"
  30 #define GOOGLE_SEARCH_PATTERN_1 "{center:{lat:"
  31 #define GOOGLE_SEARCH_PATTERN_2 ",lng:"
  32 #define GOOGLE_SEARCH_NOT_FOUND "around this map area did not match any locations"
  33
  34 static gchar *last_search_str = NULL;
  35 static VikCoord *last_coord = NULL;
  36 static gchar *last_successful_search_str = NULL;
  37
  38 static DownloadOptions googlesearch_options = { "http://maps.google.com/" };
  39
  40 gchar * a_googlesearch_get_search_string_for_this_place(VikWindow *vw)
  41 {
  42   if (!last_coord)
  43     return NULL;
  44
  45   VikViewport *vvp = vik_window_viewport(vw);
  46   const VikCoord *cur_center = vik_viewport_get_center(vvp);
  47   if (vik_coord_equals(cur_center, last_coord)) {
  48     return(last_successful_search_str);
  49   }
  50   else
  51     return NULL;
  52 }
  53
  54 static gboolean prompt_try_again(VikWindow *vw)
  55 {
  56   GtkWidget *dialog = NULL;
  57   gboolean ret = TRUE;
  58
  59   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  60   gtk_window_set_title(GTK_WINDOW(dialog), "Search");
  61
  62   GtkWidget *search_label = gtk_label_new("I don't know that place. Do you want another search?");
  63   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  64   gtk_widget_show_all(dialog);
  65
  66   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT )
  67     ret = FALSE;
  68
  69   gtk_widget_destroy(dialog);
  70   return ret;
  71 }
  72
  73 static gchar *  a_prompt_for_search_string(VikWindow *vw)
  74 {
  75   GtkWidget *dialog = NULL;
  76
  77   dialog = gtk_dialog_new_with_buttons ( "", GTK_WINDOW(vw), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
  78   gtk_window_set_title(GTK_WINDOW(dialog), "Search");
  79
  80   GtkWidget *search_label = gtk_label_new("Enter address or place name:");
  81   GtkWidget *search_entry = gtk_entry_new();
  82   if (last_search_str)
  83     gtk_entry_set_text(GTK_ENTRY(search_entry), last_search_str);
  84
  85   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_label, FALSE, FALSE, 5 );
  86   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(dialog)->vbox), search_entry, FALSE, FALSE, 5 );
  87   gtk_widget_show_all(dialog);
  88
  89   if ( gtk_dialog_run ( GTK_DIALOG(dialog) ) != GTK_RESPONSE_ACCEPT ) {
  90     gtk_widget_destroy(dialog);
  91     return NULL;
  92   }
  93
  94   gchar *search_str = g_strdup ( gtk_entry_get_text ( GTK_ENTRY(search_entry) ) );
  95
  96   gtk_widget_destroy(dialog);
  97
  98   if (search_str[0] != '\0') {
  99     if (last_search_str)
 100       g_free(last_search_str);
 101     last_search_str = g_strdup(search_str);
 102   }
 103
 104   return(search_str);   /* search_str needs to be freed by caller */
 105 }
 106
 107 static gboolean parse_file_for_latlon(gchar *file_name, struct LatLon *ll)
 108 {
 109   gchar *text, *pat;
 110   GMappedFile *mf;
 111   gsize len;
 112   gboolean found = TRUE;
 113   gchar lat_buf[32], lon_buf[32];
 114   gchar *s;
 115
 116   lat_buf[0] = lon_buf[0] = '\0';
 117
 118   if ((mf = g_mapped_file_new(file_name, FALSE, NULL)) == NULL) {
 119     g_critical("couldn't map temp file\n");
 120     exit(1);
 121   }
 122   len = g_mapped_file_get_length(mf);
 123   text = g_mapped_file_get_contents(mf);
 124
 125   if (g_strstr_len(text, len, GOOGLE_SEARCH_NOT_FOUND) != NULL) {
 126     found = FALSE;
 127     goto done;
 128   }
 129
 130   if ((pat = g_strstr_len(text, len, GOOGLE_SEARCH_PATTERN_1)) == NULL) {
 131     found = FALSE;
 132     goto done;
 133   }
 134   pat += strlen(GOOGLE_SEARCH_PATTERN_1);
 135   s = lat_buf;
 136   if (*pat == '-')
 137     *s++ = *pat++;
 138   while ((s < (lat_buf + sizeof(lat_buf))) && (pat < (text + len)) &&
 139           (g_ascii_isdigit(*pat) || (*pat == '.')))
 140     *s++ = *pat++;
 141   *s = '\0';
 142   if ((pat >= (text + len)) || (lat_buf[0] == '\0')) {
 143     found = FALSE;
 144     goto done;
 145   }
 146
 147   if (strncmp(pat, GOOGLE_SEARCH_PATTERN_2, strlen(GOOGLE_SEARCH_PATTERN_2))) {
 148       found = FALSE;
 149       goto done;
 150   }
 151
 152   pat += strlen(GOOGLE_SEARCH_PATTERN_2);
 153   s = lon_buf;
 154
 155   if (*pat == '-')
 156     *s++ = *pat++;
 157   while ((s < (lon_buf + sizeof(lon_buf))) && (pat < (text + len)) &&
 158           (g_ascii_isdigit(*pat) || (*pat == '.')))
 159     *s++ = *pat++;
 160   *s = '\0';
 161   if ((pat >= (text + len)) || (lon_buf[0] == '\0')) {
 162     found = FALSE;
 163     goto done;
 164   }
 165
 166   ll->lat = g_ascii_strtod(lat_buf, NULL);
 167   ll->lon = g_ascii_strtod(lon_buf, NULL);
 168
 169 done:
 170   g_mapped_file_free(mf);
 171   return (found);
 172
 173 }
 174
 175 gchar *uri_escape(gchar *str)
 176 {
 177   gchar *esc_str = g_malloc(3*strlen(str));
 178   gchar *dst = esc_str;
 179   gchar *src;
 180
 181   for (src = str; *src; src++) {
 182     if (*src == ' ')
 183      *dst++ = '+';
 184     else if (g_ascii_isalnum(*src))
 185      *dst++ = *src;
 186     else {
 187       g_sprintf(dst, "%%%02X", *src);
 188       dst += 3;
 189     }
 190   }
 191
 192     return(esc_str);
 193 }
 194
 195 static int google_search_get_coord(VikWindow *vw, VikViewport *vvp, gchar *srch_str, VikCoord *coord)
 196 {
 197   FILE *tmp_file;
 198   int tmp_fd;
 199   gchar *tmpname;
 200   gchar *uri;
 201   gchar *escaped_srch_str;
 202   int ret = 0;  /* OK */
 203   struct LatLon ll;
 204
 205   escaped_srch_str = uri_escape(srch_str);
 206
 207   if ((tmp_fd = g_file_open_tmp ("vikgsearch.XXXXXX", &tmpname, NULL)) == -1) {
 208     g_critical("couldn't open temp file\n");
 209     exit(1);
 210   }
 211
 212   tmp_file = fdopen(tmp_fd, "r+");
 213   //uri = g_strdup_printf(GOOGLE_SEARCH_URL_FMT, srch_str);
 214   uri = g_strdup_printf(GOOGLE_SEARCH_URL_FMT, escaped_srch_str);
 215
 216   /* TODO: curl may not be available */
 217   if (curl_download_uri(uri, tmp_file, &googlesearch_options)) {  /* error */
 218     fclose(tmp_file);
 219     ret = -1;
 220     goto done;
 221   }
 222
 223   fclose(tmp_file);
 224   if (!parse_file_for_latlon(tmpname, &ll)) {
 225     ret = -1;
 226     goto done;
 227   }
 228
 229   vik_coord_load_from_latlon ( coord, vik_viewport_get_coord_mode(vvp), &ll );
 230
 231   if (last_coord)
 232     g_free(last_coord);
 233   last_coord = g_malloc(sizeof(VikCoord));
 234   *last_coord = *coord;
 235   if (last_successful_search_str)
 236     g_free(last_successful_search_str);
 237   last_successful_search_str = g_strdup(last_search_str);
 238
 239 done:
 240   g_free(escaped_srch_str);
 241   g_free(uri);
 242   remove(tmpname);
 243   g_free(tmpname);
 244   return ret;
 245 }
 246
 247 void a_google_search(VikWindow *vw, VikLayersPanel *vlp, VikViewport *vvp)
 248 {
 249   VikCoord new_center;
 250   gchar *s_str;
 251   gboolean more = TRUE;
 252
 253   do {
 254     s_str = a_prompt_for_search_string(vw);
 255     if ((!s_str) || (s_str[0] == 0)) {
 256       more = FALSE;
 257     }
 258
 259     else if (!google_search_get_coord(vw, vvp, s_str, &new_center)) {
 260       vik_viewport_set_center_coord(vvp, &new_center);
 261       vik_layers_panel_emit_update(vlp);
 262       more = FALSE;
 263     }
 264     else if (!prompt_try_again(vw))
 265         more = FALSE;
 266     g_free(s_str);
 267   } while (more);
 268 }
 269