1 files changed, 37 insertions, 0 deletions
diff --git a/src/xattr.c b/src/xattr.c
new file mode 100644
index 000000000..fbc09c207
--- /dev/null
+++ b/src/xattr.c
@@ -0,0 +1,37 @@
+#include <sys/types.h>
+#include <sys/xattr.h> /* include header from libc, not from libattr */
+#include <string.h>
+#include <curl/curl.h>
+#include "xattr.h"
+
+/* mapping table of curl metadata to extended attribute names */
+static struct xattr_mapping {
+  char *attr; /* name of the xattr */
+  CURLINFO info;
+} mappings[] = {
+  /* mappings proposed by
+   * http://freedesktop.org/wiki/CommonExtendedAttributes
+   */
+  { "user.xdg.origin.url", CURLINFO_EFFECTIVE_URL },
+  { "user.mime_type", CURLINFO_CONTENT_TYPE },
+  { NULL, 0 } /* last element, abort loop here */
+};
+
+/* store metadata from the curl request alongside the downloaded
+ * file using extended attributes
+ */
+int write_xattr( CURL *curl, const char *filename )
+{
+  int i = 0;
+  int err = 0;
+  /* loop through all xattr-curlinfo pairs and abort on error */
+  while ( err == 0 && mappings[i].attr != NULL ) {
+    char *value = NULL;
+    curl_easy_getinfo(curl, mappings[i].info, &value);
+    if (value) {
+      err = setxattr( filename, mappings[i].attr, value, strlen(value), 0 );
+    }
+    i++;
+  }
+  return err;
+}