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