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/*
* Maildir folder access
*
* Copyright (C) 2004--2008 Enrico Zini <enrico@debian.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <buffy/mailfolder/maildir.h>
#include <wibble/exception.h>
#include <buffy/utils/system.h>
#include <sys/types.h> // stat, opendir, readdir, utimes
#include <sys/stat.h> // stat
#include <dirent.h> // opendir, readdir
#include <sys/time.h> // utimes
#include <cerrno>
#include <cstring>
using namespace std;
using namespace wibble;
namespace buffy {
namespace mailfolder {
static string concat(const std::string& str1, char sep, const std::string& str2)
{
// Avoid adding a separator if str1 or str are empty, if str1 ends with the
// separator or if str2 starts with the separator
if (!str1.empty() && str1[str1.size() - 1] != sep && ! str2.empty() && str2[0] != sep)
return str1 + sep + str2;
else
return str1 + str2;
}
Maildir::Maildir(const std::string& path) throw ()
: _path(path), _stat_total(-1), _stat_unread(-1), _stat_new(-1), _stat_flagged(-1),
_deleted(false), _new_mtime(0), _cur_mtime(0)
{
_name = _path;
/// Normalize the folder name
// Remove trailing '/'
while (_name[_name.size() - 1] == '/')
_name.resize(_name.size() - 1);
// Remove leading path
size_t lastslash = _name.find_last_of('/');
if (lastslash != string::npos)
_name = _name.substr(lastslash + 1);
// Remove leading dot
if (_name[0] == '.')
_name = _name.substr(1);
}
Maildir::Maildir(const std::string& name, const std::string& path) throw ()
: _name(name), _path(path), _stat_total(-1), _stat_unread(-1), _stat_new(-1), _stat_flagged(-1),
_deleted(false), _new_mtime(0), _cur_mtime(0) {}
bool Maildir::changed()
{
// Compute 'new' and 'cur' directory names
string path_new = _path + "/new";
string path_cur = _path + "/cur";
struct stat st_new;
if (!statIfFound(path_new, &st_new))
if (! _deleted)
{
_deleted = true;
return true;
}
struct stat st_cur;
if (!statIfFound(path_cur, &st_cur))
if (! _deleted)
{
_deleted = true;
return true;
}
if (_deleted)
{
_deleted = false;
return true;
}
return st_new.st_mtime > _new_mtime || st_cur.st_mtime > _cur_mtime;
}
void Maildir::updateStatistics()
{
int res_total = 0;
int res_unread = 0;
int res_new = 0;
int res_flagged = 0;
// Compute 'new' and 'cur' directory names
string path_new = _path + "/new";
string path_cur = _path + "/cur";
// Perform consistency checks on the 'new' directory
struct stat st_new;
if (!statIfFound(path_new, &st_new))
{
_stat_total = 0;
_stat_unread = 0;
_stat_new = 0;
_stat_flagged = 0;
_deleted = true;
return;
}
if (S_ISDIR(st_new.st_mode) == 0)
throw wibble::exception::Consistency(path_new + " is not a directory");
// Perform consistency checks on the 'cur' directory
struct stat st_cur;
if (!statIfFound(path_cur, &st_cur))
{
_stat_total = 0;
_stat_unread = 0;
_stat_new = 0;
_stat_flagged = 0;
_deleted = true;
return;
}
if (S_ISDIR(st_cur.st_mode) == 0)
throw wibble::exception::Consistency(path_cur + " is not a directory");
if (_deleted)
_deleted = false;
_new_mtime = st_new.st_mtime;
_cur_mtime = st_cur.st_mtime;
/// Count messages in the 'new' directory
// Count the files in the 'new' directory
{
Directory dir(path_new);
while (struct dirent* d = dir.read())
{
if (d->d_name[0] == '.')
continue;
res_total++;
res_new++;
}
}
// Restore the access time of the mailbox for other checking programs
struct timeval t[2];
t[0].tv_sec = st_new.st_atime;
t[0].tv_usec = 0;
t[1].tv_sec = st_new.st_mtime;
t[1].tv_usec = 0;
utimes(path_new.c_str(), t);
/// Count messages in the 'cur' directory
// Count the files in the 'cur' directory
{
Directory dir(path_cur);
while (struct dirent *d = dir.read())
{
if (d->d_name[0] == '.')
continue;
res_total++;
// Look for an `info' block in the name
char* info = strrchr(d->d_name, ':');
if (info == 0)
continue;
// Ensure that the info block is in the right format
if (strncmp(info, ":2,", 3) != 0)
continue;
// Look for the 'S' flag (it should not be there)
info += 3;
if (strchr(info, 'S') == 0)
res_unread++;
if (strchr(info, 'F') != 0)
res_flagged++;
}
}
// Restore the access time of the mailbox for other checking programs
t[0].tv_sec = st_cur.st_atime;
t[0].tv_usec = 0;
t[1].tv_sec = st_cur.st_mtime;
t[1].tv_usec = 0;
utimes(path_cur.c_str(), t);
// Return the values
_stat_total = res_total;
_stat_unread = res_unread + res_new;
_stat_new = res_new;
_stat_flagged = res_flagged;
}
static bool isMaildir(const std::string& pathname)
{
try {
// It must be a directory
struct stat st;
stat(pathname, &st);
if (S_ISDIR(st.st_mode) == 0)
return false;
// It must contain cur, new and tmp subdirectories
const char* subdirs[3] = { "cur", "new", "tmp" };
for (int i = 0; i < 3; i++)
{
string subdir = concat(pathname, '/', subdirs[i]);
struct stat st;
if (stat(subdir.c_str(), &st) != 0)
return false;
if (S_ISDIR(st.st_mode) == 0)
return false;
}
// It appears to be a maildir directory
return true;
} catch (wibble::exception::File& e) {
// If we can't even stat() it, then it's not a maildir
return false;
}
}
MailFolder Maildir::accessFolder(const std::string& path)
{
try {
if (isMaildir(path))
return MailFolder(new Maildir(path));
} catch (wibble::exception::System& e) {
// FIXME: cerr << e.type() << ": " << e.fullInfo() << endl;
}
return MailFolder();
}
static void enumerateSubfolders(
const std::string& parent,
const std::string& name,
MailFolderConsumer& cons,
InodeSet seen = InodeSet())
{
try {
struct stat st;
try {
stat(parent, &st);
} catch (wibble::exception::File& e) {
// If we can't even stat() it, then we don't try to enumerate its subfolders
// FIXME: cerr << e.type() << ": " << e.fullInfo() << endl;
return;
}
// It must be a directory
if (S_ISDIR(st.st_mode) == 0)
return;
// Check that we aren't looping
if (seen.has(st.st_ino))
return;
if (isMaildir(parent))
{
MailFolder f(new Maildir(name, parent));
cons.consume(f);
}
// Recursively enumerate the Maildirs in the directory
Directory dir(parent);
while (struct dirent *d = dir.read())
{
if (strcmp(d->d_name, ".") == 0)
continue;
if (strcmp(d->d_name, "..") == 0)
continue;
if (strcmp(d->d_name, "tmp") == 0)
continue;
if (strcmp(d->d_name, "cur") == 0)
continue;
if (strcmp(d->d_name, "new") == 0)
continue;
enumerateSubfolders(
concat(parent, '/', d->d_name),
concat(name, '.', d->d_name),
cons, seen + st.st_ino);
}
} catch (wibble::exception::Generic& e) {
// FIXME: cerr << e.type() << ": " << e.fullInfo() << endl;
}
}
void Maildir::enumerateFolders(const std::string& parent, MailFolderConsumer& cons)
{
// Remove trailing slash from the parent directory
// The root name is empty if parent is not a maildir
// else, it is the last component of parent's path
string root;
string rootName;
size_t pos = parent.rfind('/');
if (pos == string::npos)
root = rootName = parent;
else if (pos == parent.size() - 1)
{
pos = parent.rfind('/', pos - 1);
root = parent.substr(0, parent.size() - 1);
rootName = parent.substr(pos+1, parent.size() - pos - 2);
}
else
{
root = parent;
rootName = parent.substr(pos + 1);
}
if (!isMaildir(parent))
rootName = string();
enumerateSubfolders(root, rootName, cons);
}
}
}
// vim:set ts=4 sw=4:
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