+
+#include "curl_download.h"
+#include "preferences.h"
+#include "globals.h"
+
+static gboolean check_file_first_line(FILE* f, gchar *patterns[])
+{
+ gchar **s;
+ gchar *bp;
+ fpos_t pos;
+ gchar buf[33];
+ size_t nr;
+
+ memset(buf, 0, sizeof(buf));
+ fgetpos(f, &pos);
+ rewind(f);
+ nr = fread(buf, 1, sizeof(buf) - 1, f);
+ fsetpos(f, &pos);
+ for (bp = buf; (bp < (buf + sizeof(buf) - 1)) && (nr > (bp - buf)); bp++) {
+ if (!(isspace(*bp)))
+ break;
+ }
+ if ((bp >= (buf + sizeof(buf) -1)) || ((bp - buf) >= nr))
+ return FALSE;
+ for (s = patterns; *s; s++) {
+ if (strncasecmp(*s, bp, strlen(*s)) == 0)
+ return TRUE;
+ }
+ return FALSE;
+}
+
+gboolean a_check_html_file(FILE* f)
+{
+ gchar * html_str[] = {
+ "<html",
+ "<!DOCTYPE html",
+ "<head",
+ "<title",
+ NULL
+ };
+
+ return check_file_first_line(f, html_str);
+}
+
+gboolean a_check_map_file(FILE* f)
+{
+ /* FIXME no more true since a_check_kml_file */
+ return !a_check_html_file(f);
+}
+
+gboolean a_check_kml_file(FILE* f)
+{
+ gchar * kml_str[] = {
+ "<?xml",
+ NULL
+ };
+
+ return check_file_first_line(f, kml_str);
+}
+
+static GList *file_list = NULL;
+static GMutex *file_list_mutex = NULL;
+
+/* spin button scales */
+VikLayerParamScale params_scales[] = {
+ {1, 86400*7, 60, 0}, /* download_tile_age */
+};
+
+static VikLayerParam prefs[] = {
+ { VIKING_PREFERENCES_NAMESPACE "download_tile_age", VIK_LAYER_PARAM_UINT, VIK_LAYER_GROUP_NONE, N_("Tile age (s):"), VIK_LAYER_WIDGET_SPINBUTTON, params_scales + 0, NULL },
+};
+
+void a_download_init (void)
+{
+ VikLayerParamData tmp;
+ tmp.u = VIK_CONFIG_DEFAULT_TILE_AGE;
+ a_preferences_register(prefs, tmp, VIKING_PREFERENCES_GROUP_KEY);
+
+ file_list_mutex = g_mutex_new();
+}
+
+static gboolean lock_file(const char *fn)
+{
+ gboolean locked = FALSE;
+ g_mutex_lock(file_list_mutex);
+ if (g_list_find_custom(file_list, fn, (GCompareFunc)g_strcmp0) == NULL)
+ {
+ // The filename is not yet locked
+ file_list = g_list_append(file_list, (gpointer)fn),
+ locked = TRUE;
+ }
+ g_mutex_unlock(file_list_mutex);
+ return locked;
+}
+
+static void unlock_file(const char *fn)
+{
+ g_mutex_lock(file_list_mutex);
+ file_list = g_list_remove(file_list, (gconstpointer)fn);
+ g_mutex_unlock(file_list_mutex);
+}
+
+static int download( const char *hostname, const char *uri, const char *fn, DownloadMapOptions *options, gboolean ftp, void *handle)
+{
+ FILE *f;
+ int ret;
+ gchar *tmpfilename;
+ gboolean failure = FALSE;
+ DownloadFileOptions file_options = {0, NULL, NULL};
+
+ /* Check file */
+ if ( g_file_test ( fn, G_FILE_TEST_EXISTS ) == TRUE )
+ {
+ if (options == NULL || (!options->check_file_server_time &&
+ !options->use_etag)) {
+ /* Nothing to do as file already exists and we don't want to check server */
+ return -3;
+ }
+
+ time_t tile_age = a_preferences_get(VIKING_PREFERENCES_NAMESPACE "download_tile_age")->u;
+ /* Get the modified time of this file */
+ struct stat buf;
+ g_stat ( fn, &buf );
+ time_t file_time = buf.st_mtime;
+ if ( (time(NULL) - file_time) < tile_age ) {
+ /* File cache is too recent, so return */
+ return -3;
+ }
+
+ if (options->check_file_server_time) {
+ file_options.time_condition = file_time;
+ }
+ if (options->use_etag) {
+ gchar *etag_filename = g_strdup_printf("%s.etag", fn);
+ gsize etag_length = 0;
+ g_file_get_contents (etag_filename, &(file_options.etag), &etag_length, NULL);
+ g_free (etag_filename);
+ etag_filename = NULL;
+
+ /* check if etag is short enough */
+ if (etag_length > 100) {
+ g_free(file_options.etag);
+ file_options.etag = NULL;
+ }
+
+ /* TODO: should check that etag is a valid string */
+ }
+
+ } else {
+ gchar *dir = g_path_get_dirname ( fn );
+ g_mkdir_with_parents ( dir , 0777 );
+ g_free ( dir );
+ }
+
+ tmpfilename = g_strdup_printf("%s.tmp", fn);
+ if (!lock_file ( tmpfilename ) )
+ {
+ g_debug("%s: Couldn't take lock on temporary file \"%s\"\n", __FUNCTION__, tmpfilename);
+ g_free ( tmpfilename );
+ if (options->use_etag)
+ g_free ( file_options.etag );
+ return -4;
+ }
+ f = g_fopen ( tmpfilename, "w+b" ); /* truncate file and open it */
+ if ( ! f ) {
+ g_warning("Couldn't open temporary file \"%s\": %s", tmpfilename, g_strerror(errno));
+ g_free ( tmpfilename );
+ if (options->use_etag)
+ g_free ( file_options.etag );
+ return -4;
+ }
+
+ /* Call the backend function */
+ ret = curl_download_get_url ( hostname, uri, f, options, ftp, &file_options, handle );
+
+ if (ret != DOWNLOAD_NO_ERROR && ret != DOWNLOAD_NO_NEWER_FILE) {
+ g_debug("%s: download failed: curl_download_get_url=%d", __FUNCTION__, ret);
+ failure = TRUE;
+ }
+
+ if (!failure && options != NULL && options->check_file != NULL && ! options->check_file(f)) {
+ g_debug("%s: file content checking failed", __FUNCTION__);
+ failure = TRUE;
+ }
+
+ fclose ( f );
+ f = NULL;
+
+ if (failure)
+ {
+ g_warning(_("Download error: %s"), fn);
+ g_remove ( tmpfilename );
+ unlock_file ( tmpfilename );
+ g_free ( tmpfilename );
+ if (options->use_etag) {
+ g_free ( file_options.etag );
+ g_free ( file_options.new_etag );
+ }
+ return -1;
+ }
+
+ if (options->use_etag) {
+ if (file_options.new_etag) {
+ /* server returned an etag value */
+ gchar *etag_filename = g_strdup_printf("%s.etag", fn);
+ g_file_set_contents (etag_filename, file_options.new_etag, -1, NULL);
+ g_free (etag_filename);
+ etag_filename = NULL;
+ }
+ }
+
+ if (ret == DOWNLOAD_NO_NEWER_FILE) {
+ g_remove ( tmpfilename );
+#if GLIB_CHECK_VERSION(2,18,0)
+ g_utime ( fn, NULL ); /* update mtime of local copy */
+#else
+ utimes ( fn, NULL ); /* update mtime of local copy */
+#endif
+ } else {
+ g_rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */
+ }
+ unlock_file ( tmpfilename );
+ g_free ( tmpfilename );
+
+ if (options->use_etag) {
+ g_free ( file_options.etag );
+ g_free ( file_options.new_etag );
+ }
+ return 0;
+}
projects / andy / viking.git / blobdiff