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75 lines
2.2 KiB
Python
75 lines
2.2 KiB
Python
# Allows a mentor to ssh into a DigitalOcean 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 re
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import socket
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import sys
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from argparse import ArgumentParser
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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.", action="store_true")
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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 = f"https://api.github.com/users/{username}/keys"
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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(f'Mentor "{username}" has no public key.')
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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(
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rf"#<{args.username}>{{{{.+}}}}<{args.username}>(\n)?", re.DOTALL | re.MULTILINE
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)
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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(f"Successfully removed {args.username}' SSH key!")
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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(f"Successfully added {args.username}'s SSH key!")
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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(f" $ ssh zulipdev@{socket.gethostname()}\n")
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