Url handler for telnet and ssh schemas
Eric Moret
eric.moret at gmail.com
Sat Sep 18 02:22:55 UTC 2010
Hi fedora-devel,
I would like to contribute a piece of bash code that handles url in
gnome for ssh and telnet schemas. The idea being that whenever a user
clicks a link the proper client opens up in the default terminal
window configured in the user's "Preferred Applications" dialog.
examples of links:
telnet://my.telnet.server/
ssh://root@my.home.server:2222/
I am not quite sure what upstream should look like for such a script.
I took some of my code from launchmail which is a somewhat similar
script for email but has no upstream (that I can tell). The xdg-open
script from the portland/xdg-utils package is a wrapper that only
calls the corresponding Desktop startup tool. In the case of gnome it
calls gnome-open with the url passed to xdg-open. Only issue is that
gnome-open does not support telnet or ssh.
I appreciate any direct feedback on the below script and suggestions
for upstream location.
__
Eric
$ cat terminal-url-handler
#!/bin/bash
# to enable URL handling in FF, open the about:config page and add a new string:
# network.protocol-handler.app.telnet with value:
/path/to/handler/terminal-url-handler
# then add 2 new boolean:
# network.protocol-handler.external.telnet and set to true
# network.protocol-handler.external.ssh and set to true
# last, select "always ask" for content type telnet in Firefox
Preferences | Applications dialog
# the first time you use the handler manually select the script file
and check the remember option
#
# to enable this handler in gnome make sure you create the following
values in gconf:
# gconftool-2 -s /desktop/gnome/url-handlers/ssh/command
'/path/to/terminal-url-handler %s' --type String
# gconftool-2 -s /desktop/gnome/url-handlers/ssh/enabled --type Boolean true
# gconftool-2 -s /desktop/gnome/url-handlers/ssh/needs_terminal --type
Boolean false
# gconftool-2 -s /desktop/gnome/url-handlers/telnet/command
'/path/to/terminal-url-handler %s' --type String
# gconftool-2 -s /desktop/gnome/url-handlers/telnet/enabled --type Boolean true
# gconftool-2 -s /desktop/gnome/url-handlers/telnet/needs_terminal
--type Boolean false
#
# URI parsing function
# taken from http://valeriu.palos.ro/537/uri-parsing-using-bash-built-in-features/
#
# The function creates global variables with the parsed results.
# It returns 0 if parsing was successful or non-zero otherwise.
#
# [schema://][user[:password]@]host[:port][/path][?[param=value]...][#fragment]
#
uri_parser () {
# uri capture
uri="$@"
# safe escaping
uri="${uri//\`/%60}"
uri="${uri//\"/%22}"
# top level parsing
pattern='^(([a-z]{3,6})://)?((([^:\/]+)(:([^@\/]*))?@)?([^:\/?]+)(:([0-9]+))?)(\/[^?]*)?(\?[^#]*)?(#.*)?$'
[[ "$uri" =~ $pattern ]] || return 1;
# component extraction
uri=${BASH_REMATCH[0]}
uri_schema=${BASH_REMATCH[2]}
uri_address=${BASH_REMATCH[3]}
uri_user=${BASH_REMATCH[5]}
uri_password=${BASH_REMATCH[7]}
uri_host=${BASH_REMATCH[8]}
uri_port=${BASH_REMATCH[10]}
uri_path=${BASH_REMATCH[11]}
uri_query=${BASH_REMATCH[12]}
uri_fragment=${BASH_REMATCH[13]}
# path parsing
count=0
path="$uri_path"
pattern='^/+([^/]+)'
while [[ $path =~ $pattern ]]; do
eval "uri_parts[$count]=\"${BASH_REMATCH[1]}\""
path="${path:${#BASH_REMATCH[0]}}"
let count++
done
# query parsing
count=0
query="$uri_query"
pattern='^[?&]+([^= ]+)(=([^&]*))?'
while [[ $query =~ $pattern ]]; do
eval "uri_args[$count]=\"${BASH_REMATCH[1]}\""
eval "uri_arg_${BASH_REMATCH[1]}=\"${BASH_REMATCH[3]}\""
query="${query:${#BASH_REMATCH[0]}}"
let count++
done
# return success
return 0
}
error_dialog () {
echo "$1"
if [ -x /usr/bin/zenity ]; then
/usr/bin/zenity --error --text="$1"
else
xmessage "$1"
fi
}
sanity_check () {
unset INVALID
echo "$1" | grep -q "terminal-url-handler" && INVALID="yes"
echo "$1" | grep -q "gnome-open" && INVALID="yes"
if [ "$INVALID" == "yes" ]; then
error_dialog "Error: $1 is an invalid terminal. Please reconfigure."
[ -x /usr/bin/gnome-default-applications-properties ] && exec
/usr/bin/gnome-default-applications-properties
exit 1
fi
}
exists () {
which "${1%% *}" 2> /dev/null > /dev/null
return $?
}
if [ $# != 1 ]; then
error_dialog "Usage: $0 <url>"
exit 1
fi
uri_parser $1
if [ "$?" != 0 ]; then
error_dialog "Error: Invalid URL"
exit 1
fi
if [ "$uri_schema" == 'telnet' ]; then
CLI="$uri_schema $uri_host $uri_port"
elif [ "$uri_schema" == 'ssh' ]; then
CLI="$uri_schema -p ${uri_port:-22} ${uri_user:-$USER}@$uri_host"
else
error_dialog "Error: telnet and ssh are the only supported url schemas"
exit 1
fi
# Attempt to use GNOME Preferred Terminal
if [ -x /usr/bin/gconftool-2 -a -x
/usr/bin/gnome-default-applications-properties ]; then
# Pull key from gconf, trim leading & trailing spaces
PREFTERM=$(gconftool-2 -g /desktop/gnome/applications/terminal/exec
2>/dev/null | sed -e 's/^\ *//; s/\ *$//')
TERMARGS=$(gconftool-2 -g
/desktop/gnome/applications/terminal/exec_arg 2>/dev/null | sed -e
's/^\ *//; s/\ *$//')
# Remove arguments
PREFTERM="`echo $PREFTERM | cut -f1 -d" "`"
# sanity check (prevent infinite loops)
sanity_check "$PREFTERM"
if [ ! -z $DISPLAY ] && [ -x /usr/bin/gnome-open ]; then
if ! exists "$PREFTERM"; then
error_dialog "Error: The terminal $PREFTERM does not exist.
Please reconfigure."
[ -x /usr/bin/gnome-default-applications-properties ] && exec
/usr/bin/gnome-default-applications-properties
exit 1
fi
fi
else
TERMINALS="gnome-terminal konsole urxvt rxvt aterm xterm"
for PREFTERM in $TERMINALS; do
exists "$terminal" && break
done
fi
exec $PREFTERM $TERMARGS $CLI
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