Follow-up to the salvaged #59076 commit:
- Replace the bare get_secret import with a module-level Slack-pattern
helper (_get_esecret): try get_secret, on UnscopedSecretError fall back
to os.getenv. The DEFAULT profile's email adapter constructs UNSCOPED
under multiplexing, where a bare get_secret raises and would crash the
email path on startup — the exact WhatsApp defect fixed in 5438e9c629
(whatsapp_common._get_wsecret).
- Extend scope coverage to the remaining scope-blind reads:
EMAIL_IMAP_PORT / EMAIL_SMTP_PORT / EMAIL_POLL_INTERVAL (_esecret_int
replacing utils.env_int) and EMAIL_TRUST_FROM_HEADER (_esecret_bool
replacing utils.env_bool).
- Add tests: default-profile unscoped-under-multiplex construction, and
scoped ports/trust-flag no-environ-inheritance.
The email adapter (plugins/platforms/email/adapter.py) read
EMAIL_ADDRESS, EMAIL_PASSWORD, EMAIL_IMAP_HOST, EMAIL_SMTP_HOST,
EMAIL_ALLOWED_USERS, and EMAIL_ALLOW_ALL_USERS via os.getenv()
directly. In a multiplexed gateway, os.environ holds the default
profile's .env values, so every secondary profile inherited the
default profile's email credentials instead of its own.
This was a sibling of the api_server env-leak bug (#52307/#50051):
the same os.getenv→get_secret migration that PR #50094 applies to
gateway/config.py, but for the email adapter itself, which neither
PR #50094 nor #51374 covers.
Changes:
- plugins/platforms/email/adapter.py: replace os.getenv with
agent.secret_scope.get_secret for all EMAIL_* credential reads
(adapter __init__, check_email_requirements, _allowlist_in_effect,
_dispatch_message allowlist gate, _send_email SMTP helper).
- gateway/config.py: add _getenv/_getenv_str/_getenv_int helpers
(from PR #50094) and replace os.getenv with _getenv for the email
block in _apply_env_overrides, so config.platforms[EMAIL].extra
is populated from the scoped value.
- tests/gateway/test_email_secret_scope.py: 5 new tests covering
scoped credential reads, environ fallback without scope, missing-
key-no-leak, allowlist scoping, and check_email_requirements scoping.
Related: #50051, #52307, PR #50094, PR #51374
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