src/plugins/libravatar/libravatar.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2014 Hiroyuki Yamamoto and the Claws Mail Team
   4  * Copyright (C) 2014 Ricardo Mones
   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 3 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #include <glib.h>
  26 #include <glib/gi18n.h>
  27
  28 #include <curl/curl.h>
  29
  30 #include "version.h"
  31 #include "libravatar.h"
  32 #include "libravatar_prefs.h"
  33 #include "libravatar_missing.h"
  34 #include "prefs_common.h"
  35 #include "procheader.h"
  36 #include "procmsg.h"
  37 #include "utils.h"
  38 #include "md5.h"
  39
  40 /* indexes of keys are default_mode - 10 if applicable */
  41 static const char *def_mode[] = {
  42         "404",  /* not used, only useful in web pages */
  43         "mm",
  44         "identicon",
  45         "monsterid",
  46         "wavatar",
  47         "retro"
  48 };
  49
  50 static guint update_hook_id;
  51 static guint render_hook_id;
  52 static gchar *cache_dir = NULL; /* dir-separator terminated */
  53
  54 static gboolean libravatar_header_update_hook(gpointer source, gpointer data)
  55 {
  56         AvatarCaptureData *acd = (AvatarCaptureData *)source;
  57
  58         debug_print("libravatar avatar_header_update invoked\n");
  59
  60         if (!strcmp(acd->header, "From:")) {
  61                 gchar *a, *lower;
  62
  63                 a = g_strdup(acd->content);
  64                 extract_address(a);
  65
  66                 /* string to lower */
  67                 for (lower = a; *lower; lower++)
  68                         *lower = g_ascii_tolower(*lower);
  69
  70                 debug_print("libravatar added '%s'\n", a);
  71                 procmsg_msginfo_add_avatar(acd->msginfo, AVATAR_LIBRAVATAR, a);
  72         }
  73
  74         return FALSE; /* keep getting */
  75 }
  76
  77 static gchar *federated_base_url_from_address(const gchar *address)
  78 {
  79         /*
  80            TODO: no federation supported right now
  81            Details on http://wiki.libravatar.org/running_your_own/
  82          */
  83         return g_strdup(libravatarprefs.base_url);
  84 }
  85
  86 static GtkWidget *image_widget_from_filename(const gchar *filename)
  87 {
  88         GtkWidget *image = NULL;
  89         GdkPixbuf *picture = NULL;
  90         GError *error = NULL;
  91         gint w, h;
  92
  93         gdk_pixbuf_get_file_info(filename, &w, &h);
  94
  95         if (w != AVATAR_SIZE || h != AVATAR_SIZE)
  96                 /* server can provide a different size from the requested in URL */
  97                 picture = gdk_pixbuf_new_from_file_at_scale(
  98                                 filename, AVATAR_SIZE, AVATAR_SIZE, TRUE, &error);
  99         else    /* exact size */
 100                 picture = gdk_pixbuf_new_from_file(filename, &error);
 101
 102         if (error != NULL) {
 103                 g_warning("Failed to load image '%s': %s\n", filename, error->message);
 104                 g_error_free(error);
 105         } else {
 106                 if (picture) {
 107                         image = gtk_image_new_from_pixbuf(picture);
 108                         g_object_unref(picture);
 109                 } else
 110                         g_warning("Failed to load image '%s': no error returned!\n", filename);
 111         }
 112
 113         return image;
 114 }
 115
 116 static gchar *cache_name_for_md5(const gchar *md5)
 117 {
 118         if (libravatarprefs.default_mode >= DEF_MODE_MM
 119                         && libravatarprefs.default_mode <= DEF_MODE_RETRO) {
 120                 /* cache dir for generated avatars */
 121                 return g_strconcat(cache_dir, def_mode[libravatarprefs.default_mode - 10],
 122                                    G_DIR_SEPARATOR_S, md5, NULL);
 123         }
 124         /* default cache dir */
 125         return g_strconcat(cache_dir, md5, NULL);
 126 }
 127
 128 static size_t write_image_data_cb(void *ptr, size_t size, size_t nmemb, void *stream)
 129 {
 130         size_t written = fwrite(ptr, size, nmemb, (FILE *)stream);
 131         debug_print("received %zu bytes from avatar server\n", written);
 132
 133         return written;
 134 }
 135
 136 static GtkWidget *image_widget_from_url(const gchar *url, const gchar *md5)
 137 {
 138         GtkWidget *image = NULL;
 139         gchar *filename;
 140         FILE *file;
 141         CURL *curl;
 142
 143         curl = curl_easy_init();
 144         if (curl == NULL) {
 145                 g_warning("could not initialize curl to get image from url\n");
 146                 return NULL;
 147         }
 148         curl_easy_setopt(curl, CURLOPT_URL, url);
 149         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_image_data_cb);
 150
 151         filename = cache_name_for_md5(md5);
 152         file = fopen(filename, "wb");
 153         if (file != NULL) {
 154                 long filesize;
 155
 156                 if (libravatarprefs.allow_redirects) {
 157                         long maxredirs = (libravatarprefs.default_mode == DEF_MODE_MM)? 2L: 1L;
 158
 159                         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
 160                         curl_easy_setopt(curl, CURLOPT_MAXREDIRS, maxredirs);
 161                 }
 162                 curl_easy_setopt(curl, CURLOPT_FILE, file);
 163                 debug_print("retrieving URL to file: %s -> %s\n", url, filename);
 164                 curl_easy_perform(curl);
 165                 filesize = ftell(file);
 166                 fclose(file);
 167
 168                 if (filesize < MIN_PNG_SIZE)
 169                         debug_print("not enough data for an avatar image: %ld bytes\n", filesize);
 170                 else
 171                         image = image_widget_from_filename(filename);
 172
 173                 if (!libravatarprefs.cache_icons) {
 174                         if (g_unlink(filename) < 0)
 175                                 g_warning("failed to delete cache file %s\n", filename);
 176                 }
 177
 178                 if (filesize == 0)
 179                         missing_add_md5(libravatarmisses, md5);
 180         } else {
 181                 g_warning("could not open '%s' for writting\n", filename);
 182         }
 183         curl_easy_cleanup(curl);
 184         g_free(filename);
 185
 186         return image;
 187 }
 188
 189 static gboolean is_recent_enough(const gchar *filename)
 190 {
 191         struct stat s;
 192         time_t t;
 193
 194         if (libravatarprefs.cache_icons) {
 195                 t = time(NULL);
 196                 if (t != (time_t)-1 && !g_stat(filename, &s)) {
 197                         if (t - s.st_ctime <= libravatarprefs.cache_interval * 3600)
 198                                 return TRUE;
 199                 }
 200         }
 201
 202         return FALSE; /* re-download */
 203 }
 204
 205 static GtkWidget *image_widget_from_cached_md5(const gchar *md5)
 206 {
 207         GtkWidget *image = NULL;
 208         gchar *filename;
 209
 210         filename = cache_name_for_md5(md5);
 211         if (is_file_exist(filename) && is_recent_enough(filename)) {
 212                 debug_print("found cached image for %s\n", md5);
 213                 image = image_widget_from_filename(filename);
 214         }
 215         g_free(filename);
 216
 217         return image;
 218 }
 219
 220 static gchar *libravatar_url_for_md5(const gchar *base, const gchar *md5)
 221 {
 222         if (libravatarprefs.default_mode >= DEF_MODE_404) {
 223                 return g_strdup_printf("%s/%s?s=%u&d=%s",
 224                                 base, md5, AVATAR_SIZE,
 225                                 def_mode[libravatarprefs.default_mode - 10]);
 226         } else if (libravatarprefs.default_mode == DEF_MODE_URL) {
 227                 return g_strdup_printf("%s/%s?s=%u&d=%s",
 228                                 base, md5, AVATAR_SIZE,
 229                                 libravatarprefs.default_mode_url);
 230         } else if (libravatarprefs.default_mode == DEF_MODE_NONE) {
 231                 return g_strdup_printf("%s/%s?s=%u",
 232                                 base, md5, AVATAR_SIZE);
 233         }
 234
 235         g_warning("invalid libravatar default mode: %d\n", libravatarprefs.default_mode);
 236         return NULL;
 237 }
 238
 239 static gboolean libravatar_image_render_hook(gpointer source, gpointer data)
 240 {
 241         AvatarRender *ar = (AvatarRender *)source;
 242         GtkWidget *image = NULL;
 243         gchar *a = NULL, *url = NULL;
 244         gchar md5sum[33];
 245
 246         debug_print("libravatar avatar_image_render invoked\n");
 247
 248         a = procmsg_msginfo_get_avatar(ar->full_msginfo, AVATAR_LIBRAVATAR);
 249         if (a != NULL) {
 250                 gchar *base;
 251
 252                 md5_hex_digest(md5sum, a);
 253                 /* try missing cache */
 254                 if (is_missing_md5(libravatarmisses, md5sum)) {
 255                         return FALSE;
 256                 }
 257                 /* try disk cache */
 258                 image = image_widget_from_cached_md5(md5sum);
 259                 if (image != NULL) {
 260                         if (ar->image) /* previous plugin set one */
 261                                 gtk_widget_destroy(ar->image);
 262                         ar->image = image;
 263                         return FALSE;
 264                 }
 265                 /* not cached copy: try network */
 266                 if (prefs_common.work_offline) {
 267                         debug_print("working off-line: libravatar network retrieval skipped\n");
 268                         return FALSE;
 269                 }
 270                 base = federated_base_url_from_address(a);
 271                 url = libravatar_url_for_md5(base, md5sum);
 272                 if (url != NULL) {
 273                         image = image_widget_from_url(url, md5sum);
 274                         g_free(url);
 275                         if (image != NULL) {
 276                                 if (ar->image) /* previous plugin set one */
 277                                         gtk_widget_destroy(ar->image);
 278                                 ar->image = image;
 279                         }
 280                 }
 281                 g_free(base);
 282
 283                 return TRUE;
 284         }
 285
 286         return FALSE; /* keep rendering */
 287 }
 288
 289 static gint cache_dir_init()
 290 {
 291         gchar *subdir;
 292         int i;
 293
 294         cache_dir = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 295                                 LIBRAVATAR_CACHE_DIR, G_DIR_SEPARATOR_S,
 296                                 NULL);
 297         if (!is_dir_exist(cache_dir)) {
 298                 if (make_dir(cache_dir) < 0) {
 299                         g_free(cache_dir);
 300                         return -1;
 301                 }
 302         }
 303         for (i = DEF_MODE_MM; i <= DEF_MODE_RETRO; ++i) {
 304                 subdir = g_strconcat(cache_dir, def_mode[i - 10], NULL);
 305                 if (!is_dir_exist(subdir)) {
 306                         if (make_dir(subdir) < 0) {
 307                                 g_warning("cannot create directory %s\n", subdir);
 308                                 g_free(subdir);
 309                                 return -1;
 310                         }
 311                 }
 312                 g_free(subdir);
 313         }
 314
 315         return 0;
 316 }
 317
 318 static gint missing_cache_init()
 319 {
 320         gchar *cache_file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 321                                         LIBRAVATAR_CACHE_DIR, G_DIR_SEPARATOR_S,
 322                                         LIBRAVATAR_MISSING_FILE, NULL);
 323
 324         libravatarmisses = missing_load_from_file(cache_file);
 325         g_free(cache_file);
 326
 327         if (libravatarmisses == NULL)
 328                 return -1;
 329
 330         return 0;
 331 }
 332
 333 static void missing_cache_done()
 334 {
 335         gchar *cache_file;
 336
 337         if (libravatarmisses != NULL) {
 338                 cache_file = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 339                                         LIBRAVATAR_CACHE_DIR, G_DIR_SEPARATOR_S,
 340                                         LIBRAVATAR_MISSING_FILE, NULL);
 341                 missing_save_to_file(libravatarmisses, cache_file);
 342                 g_free(cache_file);
 343                 g_hash_table_destroy(libravatarmisses);
 344         }
 345 }
 346
 347 /**
 348  * Initialize plugin.
 349  *
 350  * @param error  For storing the returned error message.
 351  *
 352  * @return 0 if initialization succeeds, -1 on failure.
 353  */
 354 gint plugin_init(gchar **error)
 355 {
 356         if (!check_plugin_version(MAKE_NUMERIC_VERSION(3,9,3,29),
 357                                   VERSION_NUMERIC, _("Libravatar"), error))
 358                 return -1;
 359         /* get info from headers */
 360         update_hook_id = hooks_register_hook(AVATAR_HEADER_UPDATE_HOOKLIST,
 361                                              libravatar_header_update_hook,
 362                                              NULL);
 363         if (update_hook_id == -1) {
 364                 *error = g_strdup(_("Failed to register avatar header update hook"));
 365                 return -1;
 366         }
 367         /* get image for displaying */
 368         render_hook_id = hooks_register_hook(AVATAR_IMAGE_RENDER_HOOKLIST,
 369                                              libravatar_image_render_hook,
 370                                              NULL);
 371         if (render_hook_id == -1) {
 372                 *error = g_strdup(_("Failed to register avatar image render hook"));
 373                 return -1;
 374         }
 375         /* cache dir */
 376         if (cache_dir_init() == -1) {
 377                 *error = g_strdup(_("Failed to create avatar image cache directory"));
 378                 return -1;
 379         }
 380         /* preferences page */
 381         libravatar_prefs_init();
 382         /* curl library */
 383         curl_global_init(CURL_GLOBAL_DEFAULT);
 384         /* missing cache */
 385         if (missing_cache_init() == -1) {
 386                 *error = g_strdup(_("Failed to load missing items cache"));
 387                 return -1;
 388         }
 389         debug_print("Libravatar plugin loaded\n");
 390
 391         return 0;
 392 }
 393
 394 /**
 395  * Destructor for the plugin.
 396  * Unregister the callback function and frees matcher.
 397  *
 398  * @return Always TRUE.
 399  */
 400 gboolean plugin_done(void)
 401 {
 402         if (render_hook_id != -1) {
 403                 hooks_unregister_hook(AVATAR_IMAGE_RENDER_HOOKLIST,
 404                                       render_hook_id);
 405                 render_hook_id = -1;
 406         }
 407         if (update_hook_id != -1) {
 408                 hooks_unregister_hook(AVATAR_HEADER_UPDATE_HOOKLIST,
 409                                       update_hook_id);
 410                 update_hook_id = -1;
 411         }
 412         libravatar_prefs_done();
 413         missing_cache_done();
 414         if (cache_dir != NULL)
 415                 g_free(cache_dir);
 416         debug_print("Libravatar plugin unloaded\n");
 417
 418         return TRUE;
 419 }
 420
 421 /**
 422  * Get the name of the plugin.
 423  *
 424  * @return The plugin's name, maybe translated.
 425  */
 426 const gchar *plugin_name(void)
 427 {
 428         return _("Libravatar");
 429 }
 430
 431 /**
 432  * Get the description of the plugin.
 433  *
 434  * @return The plugin's description, maybe translated.
 435  */
 436 const gchar *plugin_desc(void)
 437 {
 438         return _("Display libravatar profiles' images for mail messages. More\n"
 439                  "info about libravatar at http://www.libravatar.org/. If you have\n"
 440                  "a gravatar.com profile but not a libravatar one, those will also\n"
 441                  "be retrieved (when redirections are allowed in plugin config).\n"
 442                  "Plugin config page it's available from main window at:\n"
 443                  "/Configuration/Preferences/Plugins/Libravatar.\n\n"
 444                  "This plugin uses libcurl to retrieve images, so if you're behind a\n"
 445                  "proxy please refer to curl(1) manpage for details on 'http_proxy'\n"
 446                  "configuration. More details about this and others on README file.\n\n"
 447                  "Feedback to <ricardo@mones.org> is welcome.\n");
 448 }
 449
 450 /**
 451  * Get the kind of plugin.
 452  *
 453  * @return The "GTK2" constant.
 454  */
 455 const gchar *plugin_type(void)
 456 {
 457         return "GTK2";
 458 }
 459
 460 /**
 461  * Get the license acronym the plugin is released under.
 462  *
 463  * @return The "GPL3+" constant.
 464  */
 465 const gchar *plugin_licence(void)
 466 {
 467         return "GPL3+";
 468 }
 469
 470 /**
 471  * Get the version of the plugin.
 472  *
 473  * @return The current version string.
 474  */
 475 const gchar *plugin_version(void)
 476 {
 477         return VERSION;
 478 }
 479
 480 /**
 481  * Get the features implemented by the plugin.
 482  *
 483  * @return A constant PluginFeature structure with the features.
 484  */
 485 struct PluginFeature *plugin_provides(void)
 486 {
 487         static struct PluginFeature features[] =
 488                 { {PLUGIN_OTHER, N_("Libravatar")},
 489                   {PLUGIN_NOTHING, NULL}};
 490
 491         return features;
 492 }
 493