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/*
* Copyright (C) 2012-2014 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Jussi Pakkanen <jussi.pakkanen@canonical.com>
*/
#include<internal/mediaartcache.h>
#include<dirent.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<errno.h>
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<assert.h>
#include<utime.h>
#include<glib.h>
#include<vector>
#include<algorithm>
#include<stdexcept>
using namespace std;
static string md5(const string &str) {
const unsigned char *buf = (const unsigned char *)str.c_str();
char *normalized = g_utf8_normalize((const gchar*)buf, str.size(), G_NORMALIZE_ALL);
string final;
gchar *result;
if(normalized) {
buf = (const unsigned char*)normalized;
}
result = g_compute_checksum_for_data(G_CHECKSUM_MD5, buf, strlen((const char*)buf));
final = result;
g_free((gpointer)normalized);
g_free(result);
return final;
}
MediaArtCache::MediaArtCache() {
string xdg_base = g_get_user_cache_dir();
if (xdg_base == "") {
string s("Could not determine cache dir.");
throw runtime_error(s);
}
int ec = mkdir(xdg_base.c_str(), S_IRUSR | S_IWUSR | S_IXUSR);
if (ec < 0 && errno != EEXIST) {
string s("Could not create base dir.");
throw runtime_error(s);
}
root_dir = xdg_base + "/media-art";
ec = mkdir(root_dir.c_str(), S_IRUSR | S_IWUSR | S_IXUSR);
if (ec < 0 && errno != EEXIST) {
string s("Could not create cache dir.");
throw runtime_error(s);
}
}
bool MediaArtCache::has_art(const std::string &artist, const std::string &album) const {
string fname = get_art_file(artist, album);
return access(fname.c_str(), R_OK) == 0;
}
void MediaArtCache::add_art(const std::string &artist, const std::string &album,
const char *data, unsigned int datalen) {
string abs_fname = get_full_filename(artist, album);
GError *err = nullptr;
if(!g_file_set_contents(abs_fname.c_str(), data, datalen, &err)) {
string e("Could not write file ");
e += abs_fname;
e += ": ";
e += err->message;
g_error_free(err);
throw runtime_error(e);
}
}
string MediaArtCache::get_art_file(const std::string &artist, const std::string &album) const {
string abs_fname = get_full_filename(artist, album);
if (access(abs_fname.c_str(), R_OK) == 0) {
utime(abs_fname.c_str(), nullptr); // update access times to current time
return abs_fname;
}
return "";
}
string MediaArtCache::get_art_uri(const string &artist, const string &album) const
{
std::string filename = get_art_file(artist, album);
if (filename == "") {
return "";
}
GError *err = nullptr;
char *c_uri = g_filename_to_uri(filename.c_str(), "", &err);
if (!c_uri) {
string e("Could not convert file name ");
e += filename;
e += " to URI: ";
e += err->message;
g_error_free(err);
throw runtime_error(e);
}
std::string uri = c_uri;
g_free(c_uri);
return uri;
}
std::string MediaArtCache::get_full_filename(const std::string &artist, const std::string & album) const {
return root_dir + "/" + compute_base_name(artist, album);
}
std::string MediaArtCache::compute_base_name(const std::string &artist, const std::string &album) const {
string type = "album";
string h1 = md5(artist);
string h2 = md5(album);
return type + "-" + h1 + "-" + h2 + ".jpg";
}
void MediaArtCache::clear() const {
DIR *d = opendir(root_dir.c_str());
if(!d) {
string s = "Something went wrong.";
throw runtime_error(s);
}
struct dirent *entry, *de;
entry = (dirent*)malloc(sizeof(dirent) + NAME_MAX + 1);
while(readdir_r(d, entry, &de) == 0 && de) {
string basename = entry->d_name;
if (basename == "." || basename == "..")
continue;
string fname = root_dir + "/" + basename;
if(remove(fname.c_str()) < 0) {
// This is not really an error worth
// halting everything for.
fprintf(stderr, "Could not delete file %s: %s.\n", fname.c_str(),
strerror(errno));
}
}
free(entry);
closedir(d);
}
void MediaArtCache::prune() {
vector<pair<double, string>> mtimes;
DIR *d = opendir(root_dir.c_str());
if(!d) {
string s = "Something went wrong.";
throw runtime_error(s);
}
struct dirent *entry, *de;
entry = (dirent*)malloc(sizeof(dirent) + NAME_MAX + 1);
while(readdir_r(d, entry, &de) == 0 && de) {
string basename = entry->d_name;
if (basename == "." || basename == "..")
continue;
string fname = root_dir + "/" + basename;
struct stat sbuf;
if(stat(fname.c_str(), &sbuf) != 0) {
continue;
}
// Use mtime because atime is not guaranteed to work if, for example
// the filesystem is mounted with noatime or relatime.
mtimes.push_back(make_pair(sbuf.st_mtim.tv_sec + sbuf.st_mtim.tv_nsec/1000000000.0, fname));
}
free(entry);
closedir(d);
if (mtimes.size() <= MAX_SIZE)
return;
sort(mtimes.begin(), mtimes.end());
for(size_t i=0; i < mtimes.size()-MAX_SIZE; i++) {
if(remove(mtimes[i].second.c_str()) < 0) {
fprintf(stderr, "Could not remove file %s: %s.\n",
mtimes[i].second.c_str(), strerror(errno));
}
}
}
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