1 files changed, 31 insertions, 5 deletions
diff --git a/lib/Net/IMAP/InterIMAP.pm b/lib/Net/IMAP/InterIMAP.pm
index 67b3ce5..7b0a2be 100644
--- a/lib/Net/IMAP/InterIMAP.pm
+++ b/lib/Net/IMAP/InterIMAP.pm
@@ -22,7 +22,7 @@ use strict;
 
 use Compress::Raw::Zlib qw/Z_OK Z_FULL_FLUSH Z_SYNC_FLUSH MAX_WBITS/;
 use Config::Tiny ();
-use Errno 'EINTR';
+use Errno qw/EEXIST EINTR/;
 use Fcntl qw/F_GETFD F_SETFD FD_CLOEXEC/;
 use Net::SSLeay ();
 use List::Util qw/all first/;
@@ -35,7 +35,7 @@ BEGIN {
     Net::SSLeay::SSLeay_add_ssl_algorithms();
     Net::SSLeay::randomize();
 
-    our @EXPORT_OK = qw/read_config compact_set $IMAP_text $IMAP_cond
+    our @EXPORT_OK = qw/xdg_basedir read_config compact_set $IMAP_text $IMAP_cond
                         slurp is_dirty has_new_mails/;
 }
 
@@ -76,6 +76,35 @@ my $CRLF = "\x0D\x0A";
 #############################################################################
 # Utilities
 
+# xdg_basedir($xdg_variable, $default, $subdir, $path)
+#   Return $path if $path is absolute.  Otherwise, return
+#   "$ENV{$xdg_variable}/$subdir/$path" (resp. "~/$default/$subdir/path"
+#   if the "$xdg_variable" environment variable is not set).
+#   An error is raised if "$ENV{$xdg_variable}" (resp. "~/$default") is
+#   not an existing absolute directory.
+#   If "$ENV{$xdg_variable}/$subdir" doesn't exist, it is created with
+#   mode 0700.
+sub xdg_basedir($$$$) {
+    my ($xdg_variable, $default, $subdir, $path) = @_;
+    $path =~ /\A(\p{Print}+)\z/ or die "Insecure $path";
+    $path = $1;
+    return $path if $path =~ /\A\//;
+
+    my $basedir = $ENV{$xdg_variable};
+    unless (defined $basedir) {
+        my @getent = getpwuid($>);
+        $basedir = $getent[7] ."/". $default;
+    }
+    die "No such directory: ", $basedir unless -d $basedir;
+    $basedir .= "/".$subdir;
+    $basedir =~ /\A(\/\p{Print}+)\z/ or die "Insecure $basedir";
+    $basedir = $1;
+    unless (mkdir ($basedir, 0700)) {
+        die "Couldn't create $basedir: $!\n" unless $! == EEXIST;
+    }
+    return $basedir ."/". $path;
+}
+
 # read_config($conffile, $sections, %opts)
 #   Read $conffile's default section, then each section in the array
 #   reference $section (which takes precedence).  %opts extends %OPTIONS
@@ -85,9 +114,6 @@ sub read_config($$%) {
     my $sections = shift;
     my %opts = (%OPTIONS, @_);
 
-    $conffile = ($ENV{XDG_CONFIG_HOME} // "$ENV{HOME}/.config") .'/'. $conffile
-        unless $conffile =~ /\A\//; # relative path
-
     die "No such config file $conffile\n"
         unless defined $conffile and -f $conffile and -r $conffile;