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76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
# Allows a mentor to ssh into a Digital Ocean droplet. This is designed to be
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# executed on the target machine.
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#
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# This script takes the username of the mentor as an argument:
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#
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# $ python3 add_mentor.py <mentor's username>
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#
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# Alternatively you can pass in --remove to remove their ssh key from the
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# machine:
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#
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# $ python3 add_mentor.py --remove <mentor's username>
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import os
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import sys
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from argparse import ArgumentParser
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from typing import List
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import socket
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import re
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import requests
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parser = ArgumentParser(description='Give a mentor ssh access to this machine.')
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parser.add_argument('username', help='Github username of the mentor.')
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parser.add_argument('--remove', help='Remove his/her key from the machine.',
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action='store_true', default=False)
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# Wrap keys with line comments for easier key removal.
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append_key = """\
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#<{username}>{{{{
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{key}
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#}}}}<{username}>
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"""
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def get_mentor_keys(username: str) -> List[str]:
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url = 'https://api.github.com/users/{}/keys'.format(username)
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r = requests.get(url)
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if r.status_code != 200:
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print('Cannot connect to Github...')
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sys.exit(1)
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keys = r.json()
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if not keys:
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print('Mentor "{}" has no public key.'.format(username))
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sys.exit(1)
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return [key['key'] for key in keys]
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if __name__ == '__main__':
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args = parser.parse_args()
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authorized_keys = os.path.expanduser('~/.ssh/authorized_keys')
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if args.remove:
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remove_re = re.compile('#<{0}>{{{{.+}}}}<{0}>(\n)?'.format(args.username),
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re.DOTALL | re.MULTILINE)
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with open(authorized_keys, 'r+') as f:
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old_content = f.read()
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new_content = re.sub(remove_re, '', old_content)
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f.seek(0)
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f.write(new_content)
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f.truncate()
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print('Successfully removed {}\' SSH key!'.format(args.username))
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else:
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keys = get_mentor_keys(args.username)
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with open(authorized_keys, 'a') as f:
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for key in keys:
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f.write(append_key.format(username=args.username, key=key))
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print('Successfully added {}\'s SSH key!'.format(args.username))
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print('Can you let your mentor know that they can connect to this machine with:\n')
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print(' $ ssh zulipdev@{}\n'.format(socket.gethostname()))
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