Checklist

• There are no similar issues or pull requests for this yet.
• I discussed this idea on the community chat and feedback is positive.

Is your feature related to a problem? Please describe.

I would like to pass an existing SSL Context to uvicorn.run(). For example, I have a certificate that needs a password to load. Typically I would do that by setting up a context like so:

ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
# ... customize context even more
ssl_context.load_cert_chain(ssl_crt_path, keyfile=ssl_key_path, password=ssl_key_password)

The current options are limited to these kinds of advance scenarios and I'd like to avoid keep adding/requesting --ssl-xyz options for each of those scenarios. I know I can decrypt the key before loading it into python, but I'm limited on the environment I need to deploy on since I'm given the encrypted key and the password via a secret.

Describe the solution you would like.

Adding the ability to pass a ssl_context to uvicorn.run in python code that supersedes any of the ssl_* settings if provided.

Example changes in uvicorn/config.py:

@property
def is_ssl(self) -> bool:
    return bool(self.ssl_keyfile or self.ssl_certfile)

@property
def is_ssl_context(self) -> bool:
    return isinstance(self.ssl_context, ssl.SSLContext)

# ...

if self.is_ssl and not self.is_ssl_context:
    self.ssl = create_ssl_context(
        keyfile=self.ssl_keyfile,
        certfile=self.ssl_certfile,
        ssl_version=self.ssl_version,
        cert_reqs=self.ssl_cert_reqs,
        ca_certs=self.ssl_ca_certs,
        ciphers=self.ssl_ciphers,
    )
elif self.is_ssl_context:
    self.ssl = self.ssl_context
else:
    self.ssl = None

# ...

Describe alternatives you considered

Searched source code to see if there was a way to pass a custom context to no avail.

Additional context

Since ssl context is createe via python, it would not quite be supported via command line. Unless we want to get fancy. I can attempt to do a PR if permitted. Thanks!