Scott Percival created GUACAMOLE-1973:
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Summary: Add XTerm bracketed paste support to terminal emulator
Key: GUACAMOLE-1973
URL: https://issues.apache.org/jira/browse/GUACAMOLE-1973
Project: Guacamole
Issue Type: Improvement
Components: guacamole-server, Terminal
Reporter: Scott Percival
The clipboard feature in the terminal emulator sends the clipboard buffer
directly to the server, without any preprocessing. Current best practice for
terminal emulators appears to be to strip out the majority of control
characters, and for shells that support the feature, inject escape sequences at
the start and end of the data to indicate pasted input is incoming (aka. XTerm
bracketed paste mode - https://invisible-island.net/xterm/xterm-paste64.html ).
Newer versions of shells with bracketed paste support will buffer multi-line
inputs on screen for review, rather than immediately executing them. In
addition this provides a better experience in programs which treat pasted data
differently from typed data, e.g. IPython will perform automatic indentation on
typed text but not pasted text.
The approach I took is based on this patch adding filtering and bracketed paste
to Microsoft Terminal - https://github.com/microsoft/terminal/pull/9034/files .
The difference is that Microsoft Terminal uses wchar internally, making it
easier to separate out lone Unicode C1 control characters (0x80-0x9f) without
impacting UTF-8 codepoint continuation. I ended up writing a sieve to pass
valid UTF-8 codepoints.
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