1 files changed, 95 insertions, 0 deletions
diff --git a/src/xattr.c b/src/xattr.c
new file mode 100644
index 0000000..98a002a
--- /dev/null
+++ b/src/xattr.c
@@ -0,0 +1,95 @@
+/* xattr.h -- POSIX Extended Attribute support.
+
+   Copyright (C) 2016, 2018-2022 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
+
+#include "wget.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include "log.h"
+#include "utils.h"
+#include "xattr.h"
+
+#ifdef USE_XATTR
+
+static int
+write_xattr_metadata (const char *name, const char *value, FILE *fp)
+{
+  int retval = -1;
+
+  if (name && value && fp)
+    {
+      retval = fsetxattr (fileno (fp), name, value, strlen (value), 0);
+      /* FreeBSD's extattr_set_fd returns the length of the extended attribute. */
+      retval = (retval < 0) ? retval : 0;
+      if (retval)
+        DEBUGP (("Failed to set xattr %s.\n", quote(name)));
+    }
+
+  return retval;
+}
+
+#else /* USE_XATTR */
+
+static int
+write_xattr_metadata (const char *name, const char *value, FILE *fp)
+{
+  (void)name;
+  (void)value;
+  (void)fp;
+
+  return 0;
+}
+
+#endif /* USE_XATTR */
+
+int
+set_file_metadata (const struct url *origin_url, const struct url *referrer_url, FILE *fp)
+{
+  /* Save metadata about where the file came from (requested, final URLs) to
+   * user POSIX Extended Attributes of retrieved file.
+   *
+   * For more details about the user namespace see
+   * [http://freedesktop.org/wiki/CommonExtendedAttributes] and
+   * [http://0pointer.de/lennart/projects/mod_mime_xattr/].
+   */
+  int retval = -1;
+  char *value;
+
+  if (!origin_url || !fp)
+    return retval;
+
+  value = url_string (origin_url, URL_AUTH_HIDE);
+  retval = write_xattr_metadata ("user.xdg.origin.url", escnonprint_uri (value), fp);
+  xfree (value);
+
+  if (!retval && referrer_url)
+    {
+	  struct url u;
+
+	  memset(&u, 0, sizeof(u));
+      u.scheme = referrer_url->scheme;
+      u.host = referrer_url->host;
+      u.port = referrer_url->port;
+
+      value = url_string (&u, 0);
+      retval = write_xattr_metadata ("user.xdg.referrer.url", escnonprint_uri (value), fp);
+      xfree (value);
+    }
+
+  return retval;
+}