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24 lines
897 B
Python
24 lines
897 B
Python
import re
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import traceback
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import dns.resolver
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def compute_mit_user_fullname(email: str) -> str:
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try:
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# Input is either e.g. username@mit.edu or user|CROSSREALM.INVALID@mit.edu
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match_user = re.match(r"^([a-zA-Z0-9_.-]+)(\|.+)?@mit\.edu$", email.lower())
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if match_user and match_user.group(2) is None:
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answer = dns.resolver.resolve(f"{match_user.group(1)}.passwd.ns.athena.mit.edu", "TXT")
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hesiod_name = answer[0].strings[0].decode().split(":")[4].split(",")[0].strip()
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if hesiod_name != "":
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return hesiod_name
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elif match_user:
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return match_user.group(1).lower() + "@" + match_user.group(2).upper().removeprefix("|")
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except dns.resolver.NXDOMAIN:
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pass
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except Exception:
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print(f"Error getting fullname for {email}:")
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traceback.print_exc()
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return email.lower()
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