Add Escape Sequences to Shell Sessions #96
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Add a struct for tracking the state of a possible escape sequence. We're using the same escape sequence as SSH, which is a newline followed by tilde (~). See https://linux.die.net/man/1/ssh. To do this we need to track keypresses over multiple iterations of the Unix and Windows handleKeyboardInput function loops. In particular we need to half trigger on newline, and then fully trigger on tilde (~).
Implement a function to process key presses looking for the escape sequence, and storing the state in the Shell Session Escape Sequence tracking struct. We do not want to send the tilde (~), or the command to the target. To do this we need to indicate to the Unix and Windows handleKeyboardInput functions whether to send the keypress to the target of this session, or skip the loop iteration. As a start, the following commands have been implemented: - ~? help - ~~ send ~ to the connected session - ~- disable escape sequences for the rest of this session - ~. disconnect and terminate the session
Add the handleEscapeSequence function to both the Unix and Windows handleKeyboardInput functions.
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Issue
Description of changes:
Add a SSH-like escape sequence to shell sessions.
As a start, the only functionality is terminating the session.
This allows an operator to terminate their session if the remote target becomes unresponsive.
Warning
Please note that session termination does not current work for AWS SSO / Identity Center authentication credentials.
This is due to a bug in session-manager-plugin, which interferes with refreshing SSO tokens.
(I'll raise a separate PR for that issue).
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