auth-manager: add helper function nm_auth_call_result_eval()

This makes NMAuthCallResult not only usable from within a NMAuthChain.
It makes sense to just call nm-auth-manager directly, but then we need
a way to convert the more detailed result into an NMAuthCallResult
value.

src/nm-auth-manager.h

@@ -23,6 +23,31 @@
 
 #include "nm-auth-subject.h"
 
+/*****************************************************************************/
+
+typedef enum {
+	NM_AUTH_CALL_RESULT_UNKNOWN,
+	NM_AUTH_CALL_RESULT_YES,
+	NM_AUTH_CALL_RESULT_AUTH,
+	NM_AUTH_CALL_RESULT_NO,
+} NMAuthCallResult;
+
+static inline NMAuthCallResult
+nm_auth_call_result_eval (gboolean is_authorized,
+                          gboolean is_challenge,
+                          GError *error)
+{
+	if (error)
+		return NM_AUTH_CALL_RESULT_UNKNOWN;
+	if (is_authorized)
+		return NM_AUTH_CALL_RESULT_YES;
+	if (is_challenge)
+		return NM_AUTH_CALL_RESULT_AUTH;
+	return NM_AUTH_CALL_RESULT_NO;
+}
+
+/*****************************************************************************/
+
 #define NM_TYPE_AUTH_MANAGER            (nm_auth_manager_get_type ())
 #define NM_AUTH_MANAGER(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), NM_TYPE_AUTH_MANAGER, NMAuthManager))
 #define NM_AUTH_MANAGER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  NM_TYPE_AUTH_MANAGER, NMAuthManagerClass))

src/nm-auth-utils.c

@@ -247,7 +247,7 @@ pk_call_cb (NMAuthManager *auth_manager,
             gpointer user_data)
 {
 	AuthCall *call;
-	NMAuthCallResult call_result = NM_AUTH_CALL_RESULT_UNKNOWN;
+	NMAuthCallResult call_result;
 
 	if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
 		return;
@@ -262,17 +262,10 @@ pk_call_cb (NMAuthManager *auth_manager,
 		/* Don't ruin the chain. Just leave the result unknown. */
 		nm_log_warn (LOGD_CORE, "error requesting auth for %s: %s",
 		             call->permission, error->message);
-	} else {
-		if (is_authorized) {
-			/* Caller has the permission */
-			call_result = NM_AUTH_CALL_RESULT_YES;
-		} else if (is_challenge) {
-			/* Caller could authenticate to get the permission */
-			call_result = NM_AUTH_CALL_RESULT_AUTH;
-		} else
-			call_result = NM_AUTH_CALL_RESULT_NO;
 	}
 
+	call_result = nm_auth_call_result_eval (is_authorized, is_challenge, error);
+
 	nm_auth_chain_set_data (call->chain, call->permission, GUINT_TO_POINTER (call_result), NULL);
 
 	auth_call_complete (call);

src/nm-auth-utils.h

@@ -23,14 +23,9 @@
 
 #include "nm-connection.h"
 
-typedef struct NMAuthChain NMAuthChain;
+#include "nm-auth-manager.h"
 
-typedef enum {
-	NM_AUTH_CALL_RESULT_UNKNOWN,
-	NM_AUTH_CALL_RESULT_YES,
-	NM_AUTH_CALL_RESULT_AUTH,
-	NM_AUTH_CALL_RESULT_NO,
-} NMAuthCallResult;
+typedef struct NMAuthChain NMAuthChain;
 
 typedef void (*NMAuthChainResultFunc) (NMAuthChain *chain,
                                        GError *error,