Add authentication dialog

Introduce start_auth_flow, a function invoked by typing `/auth username`
in OOC. It sends an public-key authentication request to the server,
starting the entire flow.

The flow invoves two dialogs: to select the key, and to enter the
passphrase to unlock the key. For convenience, each successful unlock
also remembers the key for that username on the server, storing this
in `saved_auth.json` (I chose JSON because I wanted it to stay
human-editable; INI would be better, but it suffers from bad platform
quirks in Qt).

1 files changed, 17 insertions, 0 deletions

diff --git a/src/saved_auth.h b/src/saved_auth.h
new file mode 100644
index 0000000..d37a8fd
--- /dev/null
+++ b/src/saved_auth.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <QHash>
+
+class SavedAuth
+{
+public:
+  bool load();
+  QByteArray lookup(QByteArrayView host, QByteArrayView user) const;
+  void insert(QByteArrayView host, QByteArrayView user, QByteArrayView key);
+  void remove(QByteArrayView host, QByteArrayView user);
+
+private:
+  QHash<QByteArray, QByteArray> m_table;
+  bool save() const;
+  QByteArray flatten_key(QByteArrayView host, QByteArrayView user) const;
+};