cpp: Handle smart card op failure status messages

* lang/cpp/src/editinteractor.cpp (parse_sc_op_failure): New.
(CallbackHelper::edit_interactor_callback_impl): Parse failure code on
GPGME_STATUS_SC_OP_FAILURE status.
(sc_op_failure_to_error): New.
--

This converts a SC_OP_FAILURE status message logged by gpg to a
corresponding error. Unfortunately, GPG_ERR_BAD_PIN and
GPG_ERR_BAD_RESET_CODE are mapped to the same SC_OP_FAILURE code, so
that we had to choose one.

GnuPG-bug-id: 6971

1 files changed, 36 insertions, 0 deletions

diff --git a/lang/cpp/src/editinteractor.cpp b/lang/cpp/src/editinteractor.cpp
index 373a4464..72ed92f7 100644
--- a/lang/cpp/src/editinteractor.cpp
+++ b/lang/cpp/src/editinteractor.cpp
@@ -52,6 +52,7 @@ using namespace GpgME;
 
 static const char *status_to_string(unsigned int status);
 static Error status_to_error(unsigned int status);
+static Error parse_sc_op_failure(const char *args);
 
 class EditInteractor::Private
 {
@@ -102,6 +103,9 @@ public:
             } else if (status == GPGME_STATUS_ERROR) {
                 err = ei->q->parseStatusError(args);
                 ei->state = EditInteractor::ErrorState;
+            } else if (status == GPGME_STATUS_SC_OP_FAILURE) {
+                err = parse_sc_op_failure(args);
+                ei->state = EditInteractor::ErrorState;
             } else {
                 ei->state = ei->q->nextState(status, args, err);
             }
@@ -280,6 +284,38 @@ GpgME::Error EditInteractor::parseStatusError(const char *args)
     return err;
 }
 
+static Error sc_op_failure_to_error(unsigned int status)
+{
+    switch (status) {
+    case 1:
+        // GPG_ERR_CANCELED or GPG_ERR_FULLY_CANCELED
+        return Error::fromCode(GPG_ERR_CANCELED);
+    case 2:
+        // GPG_ERR_BAD_PIN or GPG_ERR_BAD_RESET_CODE [sic]
+        return Error::fromCode(GPG_ERR_BAD_PIN);
+    case 3:
+        return Error::fromCode(GPG_ERR_PIN_BLOCKED);
+    case 4:
+        return Error::fromCode(GPG_ERR_NO_RESET_CODE);
+    }
+    return Error::fromCode(GPG_ERR_CARD);
+}
+
+// static
+Error parse_sc_op_failure(const char *args)
+{
+    Error err;
+
+    const auto fields = split(args, ' ');
+    if (fields.size() >= 1) {
+        err = sc_op_failure_to_error(static_cast<unsigned int>(std::stoul(fields[0])));
+    } else {
+        err = Error::fromCode(GPG_ERR_CARD);
+    }
+
+    return err;
+}
+
 static const char *const status_strings[] = {
     "EOF",
     /* mkstatus processing starts here */