app-MAIL-temp/app/pgp_utils.py

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import os
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from io import BytesIO
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import gnupg
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from memory_profiler import memory_usage
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from app.config import GNUPGHOME
from app.log import LOG
from app.models import Mailbox
from app.utils import random_string
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gpg = gnupg.GPG(gnupghome=GNUPGHOME)
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gpg.encoding = "utf-8"
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class PGPException(Exception):
pass
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def load_public_key(public_key: str) -> str:
"""Load a public key into keyring and return the fingerprint. If error, raise Exception"""
import_result = gpg.import_keys(public_key)
try:
return import_result.fingerprints[0]
except Exception as e:
raise PGPException("Cannot load key") from e
def hard_exit():
pid = os.getpid()
LOG.warning("kill pid %s", pid)
os.kill(pid, 9)
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def encrypt_file(data: BytesIO, fingerprint: str) -> str:
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LOG.d("encrypt for %s", fingerprint)
mem_usage = memory_usage(-1, interval=1, timeout=1)[0]
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LOG.d("mem_usage %s", mem_usage)
# todo
if mem_usage > 300:
LOG.error("Force exit")
hard_exit()
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r = gpg.encrypt_file(data, fingerprint, always_trust=True)
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if not r.ok:
# maybe the fingerprint is not loaded on this host, try to load it
mailbox = Mailbox.get_by(pgp_finger_print=fingerprint)
if mailbox:
LOG.d("(re-)load public key for %s", mailbox)
load_public_key(mailbox.pgp_public_key)
LOG.d("retry to encrypt")
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data.seek(0)
r = gpg.encrypt_file(data, fingerprint, always_trust=True)
if not r.ok:
raise PGPException(f"Cannot encrypt, status: {r.status}")
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return str(r)