1 files changed, 25 insertions, 5 deletions
diff --git a/gpgmeplug/gpgmeplug.c b/gpgmeplug/gpgmeplug.c
index 12cf2009..0132a67e 100644
--- a/gpgmeplug/gpgmeplug.c
+++ b/gpgmeplug/gpgmeplug.c
@@ -452,11 +452,31 @@ bool signatureCertificateExpiryNearWarning( void )
 
 int signatureCertificateDaysLeftToExpiry( const char* certificate )
 {
-    /* PENDING(g10)
-       Please return the number of days that are left until the
-       certificate specified in the parameter certificate expires.
-    */
-  return 10; /* dummy that triggers a warning in the MUA */
+  GpgmeCtx ctx;
+  GpgmeError err;
+  GpgmeKey rKey;
+  time_t daysLeft = 0;
+
+  gpgme_new( &ctx );
+  gpgme_set_protocol( ctx, GPGMEPLUG_PROTOCOL );
+
+  err = gpgme_op_keylist_start( ctx, certificate, 0 );
+  if ( GPGME_No_Error == err ) {
+    err = gpgme_op_keylist_next( ctx, &rKey );
+    gpgme_op_keylist_end( ctx );
+    if ( GPGME_No_Error == err ) {
+      time_t expire_time = gpgme_key_get_ulong_attr(
+                             rKey,GPGME_ATTR_EXPIRE, NULL, 0 );
+      time_t cur_time = time (NULL);
+      daysLeft = expire_time - cur_time;
+      // convert seconds into days
+      daysLeft /= 43200;
+      gpgme_key_release( rKey );
+    }
+  }
+  gpgme_release( ctx );
+
+  return daysLeft;
 }