src/plugins/libravatar/libravatar_image.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 2016 Ricardo Mones and the Claws Mail Team
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #include <glib.h>
  25 #include <curl/curl.h>
  26 #include <pthread.h>
  27
  28 #include <common/claws.h>
  29 #include <prefs_common.h>
  30 #include <file-utils.h>
  31
  32 #include "libravatar.h"
  33 #include "libravatar_prefs.h"
  34 #include "libravatar_missing.h"
  35 #include "libravatar_image.h"
  36
  37 static size_t write_image_data_cb(void *ptr, size_t size, size_t nmemb, void *stream)
  38 {
  39         size_t written = claws_fwrite(ptr, size, nmemb, (FILE *)stream);
  40         debug_print("received %"G_GSIZE_FORMAT" bytes from avatar server\n", written);
  41
  42         return written;
  43 }
  44
  45 static GdkPixbuf *image_pixbuf_from_filename(const gchar *filename)
  46 {
  47         GdkPixbuf *picture = NULL;
  48         GError *error = NULL;
  49         gint w, h;
  50
  51         gdk_pixbuf_get_file_info(filename, &w, &h);
  52
  53         if (w != AVATAR_SIZE || h != AVATAR_SIZE)
  54                 /* server can provide a different size from the requested in URL */
  55                 picture = gdk_pixbuf_new_from_file_at_scale(
  56                                 filename, AVATAR_SIZE, AVATAR_SIZE, TRUE, &error);
  57         else    /* exact size */
  58                 picture = gdk_pixbuf_new_from_file(filename, &error);
  59
  60         if (error != NULL) {
  61                 g_warning("failed to load image '%s': %s", filename, error->message);
  62                 g_error_free(error);
  63         } else {
  64                 if (!picture)
  65                         g_warning("failed to load image '%s': no error returned!", filename);
  66         }
  67
  68         return picture;
  69 }
  70
  71 static GdkPixbuf *pixbuf_from_url(const gchar *url, const gchar *md5, const gchar *filename) {
  72         GdkPixbuf *image = NULL;
  73         FILE *file;
  74         CURL *curl;
  75         CURLcode res;
  76         long filesize;
  77
  78         file = claws_fopen(filename, "wb");
  79         if (file == NULL) {
  80                 g_warning("could not open '%s' for writing", filename);
  81                 return NULL;
  82         }
  83         curl = curl_easy_init();
  84         if (curl == NULL) {
  85                 g_warning("could not initialize curl to get image from URL");
  86                 claws_fclose(file);
  87                 return NULL;
  88         }
  89
  90         curl_easy_setopt(curl, CURLOPT_URL, url);
  91         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_image_data_cb);
  92         /* make sure timeout is less than general IO timeout */
  93         curl_easy_setopt(curl, CURLOPT_TIMEOUT,
  94                         (libravatarprefs.timeout == 0
  95                                 || libravatarprefs.timeout
  96                                         > prefs_common_get_prefs()->io_timeout_secs)
  97                         ? prefs_common_get_prefs()->io_timeout_secs
  98                         : libravatarprefs.timeout);
  99         curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
 100
 101         if (libravatarprefs.allow_redirects) {
 102                 long maxredirs = (libravatarprefs.default_mode == DEF_MODE_URL)
 103                         ? libravatarprefs.max_redirects_url
 104                         : ((libravatarprefs.default_mode == DEF_MODE_MM)
 105                                 ? libravatarprefs.max_redirects_mm
 106                                 : libravatarprefs.max_redirects_url);
 107                 debug_print("setting max redirects to %ld\n", maxredirs);
 108                 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
 109                 curl_easy_setopt(curl, CURLOPT_MAXREDIRS, maxredirs);
 110         }
 111         curl_easy_setopt(curl, CURLOPT_FILE, file);
 112         debug_print("retrieving URL to file: %s -> %s\n", url, filename);
 113         res = curl_easy_perform(curl);
 114         if (res != CURLE_OK) {
 115                 debug_print("curl_easy_perfom failed: %s", curl_easy_strerror(res));
 116                 claws_safe_fclose(file);
 117         } else {
 118                 filesize = ftell(file);
 119                 claws_safe_fclose(file);
 120                 if (filesize < MIN_PNG_SIZE)
 121                         debug_print("not enough data for an avatar image: %ld bytes\n", filesize);
 122                 else
 123                         image = image_pixbuf_from_filename(filename);
 124
 125                 if (!libravatarprefs.cache_icons || filesize == 0) {
 126                         if (g_unlink(filename) < 0)
 127                                 g_warning("failed to delete cache file '%s'", filename);
 128                 }
 129
 130                 if (filesize == 0)
 131                         missing_add_md5(libravatarmisses, md5);
 132         }
 133
 134         curl_easy_cleanup(curl);
 135
 136         return image;
 137 }
 138
 139 static void *get_image_thread(void *arg) {
 140         AvatarImageFetch *ctx = (AvatarImageFetch *)arg;
 141
 142         /* get image */
 143         ctx->pixbuf = pixbuf_from_url(ctx->url, ctx->md5, ctx->filename);
 144         /* done here */
 145         ctx->ready = TRUE;
 146
 147         return arg;
 148 }
 149
 150 GdkPixbuf *libravatar_image_fetch(AvatarImageFetch *ctx)
 151 {
 152 #ifdef USE_PTHREAD
 153         pthread_t pt;
 154 #endif
 155
 156         g_return_val_if_fail(ctx != NULL, NULL);
 157
 158 #ifdef USE_PTHREAD
 159         if (pthread_create(&pt, NULL, get_image_thread, (void *)ctx) != 0) {
 160                 debug_print("synchronous image fetching (couldn't create thread)\n");
 161                 get_image_thread(ctx);
 162         } else {
 163                 debug_print("waiting for thread completion\n");
 164                 /*
 165                 while (!ctx->ready ) {
 166                         claws_do_idle();
 167                 }
 168                 */
 169                 pthread_join(pt, NULL);
 170                 debug_print("thread completed\n");
 171         }
 172 #else
 173         debug_print("synchronous image fetching (pthreads unavailable)\n");
 174         get_image_thread(ctx);
 175 #endif
 176         if (ctx->pixbuf == NULL) {
 177                 g_warning("could not get image");
 178         }
 179         return ctx->pixbuf;
 180 }