computer-playbook/utils/cache/users/__init__.py

"""User-domain cache: defs, hydration, materialization, merged lookup.

Owns `_USERS_DEFAULTS_CACHE` and `_MERGED_USERS_CACHE`. Public API:
`get_user_defaults`, `get_merged_users`. The Ansible-facing `users`
lookup plugin consumes `get_merged_users` directly from this module
(`from utils.cache.users import get_merged_users`).
"""

from __future__ import annotations

import copy
import glob
import os
from collections import OrderedDict
from collections.abc import Mapping
from pathlib import Path
from typing import Any
from urllib.parse import urlparse

from utils.cache import base as _base
from utils.cache.base import (
    _RENDER_GUARD,
    _cache_key,
    _deep_merge,
    _render_with_templar,
    _resolve_override_mapping,
    _resolve_roles_dir,
    _stable_variables_signature,
    _tokens_file_signature,
)
from utils.cache.users.placeholders import (
    substitute_primary_domain_placeholder as _substitute_primary_domain_placeholder,
)
from utils.cache.users.placeholders import (
    substitute_scalar_placeholders as _substitute_scalar_placeholders,
)
from utils.cache.yaml import load_yaml as _load_yaml_cached
from utils.roles.mapping import ROLE_FILE_META_USERS

_USERS_DEFAULTS_CACHE: dict[str, dict[str, Any]] = {}
_MERGED_USERS_CACHE: dict[tuple, dict[str, Any]] = {}


def _merge_users(
    defaults: Mapping[str, Any],
    overrides: Mapping[str, Any] | None,
) -> dict[str, Any]:
    merged = {key: copy.deepcopy(value) for key, value in defaults.items()}
    for key, value in (overrides or {}).items():
        merged[key] = _deep_merge(merged.get(key, {}), value)
    return merged


def _derive_accounts(roles: Any) -> list[str]:
    roles = roles if isinstance(roles, (list, tuple)) else []
    return (
        ["mailbox", "identity"]
        if ("bot" in roles or "administrator" in roles)
        else ["identity"]
    )


def _apply_account_defaults(users: dict[str, Any]) -> dict[str, Any]:
    for key, user in users.items():
        if not isinstance(user, dict):
            continue
        if "email" not in user:
            user["email"] = f"{user.get('username', key)}@{{{{ DOMAIN_PRIMARY }}}}"
        if user.get("accounts") is None:
            user["accounts"] = _derive_accounts(user.get("roles", []))
        if "forward" not in user:
            user["forward"] = ""
    return users


def _compute_reserved_usernames(roles_dir: Path) -> list[str]:
    reserved: set[str] = set()
    for role_dir in roles_dir.iterdir():
        if not role_dir.is_dir():
            continue
        candidate = role_dir.name.rsplit("-", 1)[-1]
        if candidate.isalnum() and candidate.islower():
            reserved.add(candidate)
    return sorted(reserved)


def _load_user_defs(roles_dir: Path) -> OrderedDict[str, dict[str, Any]]:
    pattern = str(Path(str(roles_dir)) / f"*/{ROLE_FILE_META_USERS}")
    files = sorted(glob.glob(pattern))
    merged: OrderedDict[str, dict[str, Any]] = OrderedDict()

    for filepath in files:
        users = _load_yaml_cached(Path(filepath), default_if_missing={})
        if not isinstance(users, dict):
            continue

        for key, overrides in users.items():
            if not isinstance(overrides, dict):
                raise TypeError(f"Invalid definition for user '{key}' in {filepath}")

            if key not in merged:
                merged[key] = copy.deepcopy(overrides)
                continue

            existing = merged[key]
            for field, value in overrides.items():
                if field not in existing:
                    existing[field] = copy.deepcopy(value)
                    continue
                current = existing[field]
                if isinstance(current, dict) and isinstance(value, dict):
                    for sub_key, sub_value in value.items():
                        if sub_key in current and current[sub_key] != sub_value:
                            raise ValueError(
                                f"Conflict for user '{key}': field '{field}.{sub_key}' has "
                                f"existing value '{current[sub_key]}', tried to set "
                                f"'{sub_value}' in {filepath}"
                            )
                        current[sub_key] = copy.deepcopy(sub_value)
                    continue
                if current != value:
                    raise ValueError(
                        f"Conflict for user '{key}': field '{field}' has existing value "
                        f"'{current}', tried to set '{value}' in {filepath}"
                    )

    return merged


def _build_users(
    defs: OrderedDict[str, dict[str, Any]],
    primary_domain: str,
    start_id: int,
    become_pwd: str,
) -> OrderedDict[str, dict[str, Any]]:
    users: OrderedDict[str, dict[str, Any]] = OrderedDict()
    used_uids = set()

    for key, overrides in defs.items():
        if "uid" in overrides:
            uid = overrides["uid"]
            if uid in used_uids:
                raise ValueError(f"Duplicate uid {uid} for user '{key}'")
            used_uids.add(uid)

    next_uid = start_id

    def allocate_uid() -> int:
        nonlocal next_uid
        while next_uid in used_uids:
            next_uid += 1
        free_uid = next_uid
        used_uids.add(free_uid)
        next_uid += 1
        return free_uid

    for key, overrides in defs.items():
        username = overrides.get("username", key)
        firstname = overrides.get("firstname", f"{username}")
        lastname = overrides.get("lastname", f"{primary_domain}")
        email = overrides.get("email", f"{username}@{primary_domain}")
        description = overrides.get(
            "description", f"Created by Infinito.Nexus Ansible for {primary_domain}"
        )
        roles = overrides.get("roles", [])
        application_roles = overrides.get("application_roles", {})
        declared_password = overrides.get("password", become_pwd)
        password = (
            become_pwd if isinstance(declared_password, dict) else declared_password
        )
        accounts = overrides.get("accounts")
        if accounts is None:
            accounts = _derive_accounts(roles)
        forward = overrides.get("forward", "")
        tokens = overrides.get("tokens", {})
        authorized_keys = overrides.get("authorized_keys", [])

        uid = overrides["uid"] if "uid" in overrides else allocate_uid()
        gid = overrides.get("gid", uid)

        users[key] = {
            "username": username,
            "firstname": firstname,
            "lastname": lastname,
            "email": email,
            "password": password,
            "uid": uid,
            "gid": gid,
            "roles": roles,
            "application_roles": application_roles,
            "tokens": tokens,
            "authorized_keys": authorized_keys,
            "accounts": accounts,
            "forward": forward,
            "description": description,
        }

    seen_usernames: set[str] = set()
    seen_emails: set[str] = set()
    for entry in users.values():
        username = entry["username"]
        email = entry["email"]
        if username in seen_usernames:
            raise ValueError(f"Duplicate username '{username}' in merged users")
        if email in seen_emails:
            raise ValueError(f"Duplicate email '{email}' in merged users")
        seen_usernames.add(username)
        seen_emails.add(email)

    return users


def _load_store_users(file_tokens: str | os.PathLike[str] | None) -> dict[str, Any]:
    if not file_tokens:
        return {}

    path = Path(file_tokens)
    if not path.exists():
        return {}

    data = _load_yaml_cached(path, default_if_missing={})
    users = data.get("users", {}) if isinstance(data, dict) else {}
    return users if isinstance(users, dict) else {}


def _resolve_tokens_file(variables: Mapping[str, Any] | None) -> Path:
    candidates: list[Path] = []

    def _add_candidate(value: Any) -> None:
        if value is None:
            return
        text = str(value).strip()
        if text:
            candidates.append(Path(text))

    variables = variables or {}
    _add_candidate(variables.get("FILE_TOKENS"))

    tokens_name = _base.DEFAULT_TOKENS_FILE.name
    secrets_name = _base.DEFAULT_TOKENS_FILE.parent.name

    dir_secrets = variables.get("DIR_SECRETS")
    if dir_secrets:
        _add_candidate(Path(str(dir_secrets)) / tokens_name)

    dir_var_lib = variables.get("DIR_VAR_LIB")
    if dir_var_lib:
        _add_candidate(Path(str(dir_var_lib)) / secrets_name / tokens_name)

    _add_candidate(os.environ.get("FILE_TOKENS"))

    env_dir_secrets = os.environ.get("DIR_SECRETS")
    if env_dir_secrets:
        _add_candidate(Path(env_dir_secrets) / tokens_name)

    env_dir_var_lib = os.environ.get("DIR_VAR_LIB")
    if env_dir_var_lib:
        _add_candidate(Path(env_dir_var_lib) / secrets_name / tokens_name)

    candidates.append(_base.DEFAULT_TOKENS_FILE)

    seen: set[Path] = set()
    for candidate in candidates:
        if candidate in seen:
            continue
        seen.add(candidate)
        if candidate.exists():
            return candidate

    return candidates[0]


def _hydrate_users_tokens(
    users: Mapping[str, Any] | None,
    store_users: Mapping[str, Any] | None,
) -> dict[str, Any]:
    def _as_stripped(value: Any) -> str | None:
        if value is None:
            return None
        return str(value).strip()

    def _is_effectively_empty(value: Any) -> bool:
        stripped = _as_stripped(value)
        return stripped is None or stripped == ""

    out: dict[str, Any] = copy.deepcopy(dict(users or {}))
    if not store_users:
        return out

    for user_key, user_data in store_users.items():
        if not isinstance(user_data, Mapping):
            continue
        store_tokens = user_data.get("tokens", {})
        if not isinstance(store_tokens, Mapping):
            continue

        out_user = copy.deepcopy(dict(out.get(user_key, {}) or {}))
        out_tokens = copy.deepcopy(dict(out_user.get("tokens", {}) or {}))

        for app_id, store_token in store_tokens.items():
            token = _as_stripped(store_token)
            if token is None or token == "":
                continue
            if _is_effectively_empty(out_tokens.get(app_id)):
                out_tokens[app_id] = token

        out_user["tokens"] = out_tokens
        out[user_key] = out_user

    return out


def _materialize_domain_label_reservations(
    users: Mapping[str, Any] | None,
    variables: Mapping[str, Any] | None,
    templar: Any = None,
) -> dict[str, Any]:
    """Reserve one username per label of the deployment's primary domain.

    Args:
        users: the users resolved so far.
        variables: play variables; ``DOMAIN_PRIMARY`` wins over
            ``SYSTEM_EMAIL_DOMAIN``.
        templar: optional templar used to render a templated candidate.

    Returns:
        A copy of ``users`` with one ``domain_label_<n>`` entry per label.
    """
    from utils.templating.ansible import _templar_render_best_effort

    def _normalize_domain_candidate(value: Any) -> str:
        text = str(value or "").strip()
        if not text:
            return ""
        if ("{{" in text or "{%" in text) and variables:
            text = str(
                _templar_render_best_effort(templar, text, dict(variables))
            ).strip()
        if "://" in text:
            parsed = urlparse(text)
            text = parsed.hostname or text
        return text.split("/", 1)[0].split(":", 1)[0].strip()

    out: dict[str, Any] = copy.deepcopy(dict(users or {}))
    variables = variables or {}

    primary_domain = ""
    for candidate_key in ("DOMAIN_PRIMARY", "SYSTEM_EMAIL_DOMAIN"):
        primary_domain = _normalize_domain_candidate(variables.get(candidate_key))
        if primary_domain:
            break

    for index, label in enumerate(
        label for label in primary_domain.split(".") if label
    ):
        out[f"domain_label_{index}"] = {
            "description": (
                f"Auto generated account reserving the domain label '{label}'"
            ),
            "username": label,
            "accounts": [],
        }

    return out


def get_user_defaults(
    *, roles_dir: str | os.PathLike[str] | None = None
) -> dict[str, Any]:
    resolved_roles_dir = _resolve_roles_dir(roles_dir=roles_dir)
    key = _cache_key(resolved_roles_dir)
    cached = _USERS_DEFAULTS_CACHE.get(key)
    if cached is None:
        definitions = _load_user_defs(resolved_roles_dir)
        for reserved_username in _compute_reserved_usernames(resolved_roles_dir):
            if reserved_username not in definitions:
                definitions[reserved_username] = {"accounts": []}
        built = _build_users(
            definitions,
            primary_domain="{{ DOMAIN_PRIMARY }}",
            start_id=1001,
            become_pwd="{{ 42 | strong_password }}",  # noqa: S106  Jinja expression rendered to a password at runtime, not a literal credential
        )
        cached = {key: built[key] for key in sorted(built)}
        _USERS_DEFAULTS_CACHE[key] = cached
    return copy.deepcopy(cached)


def get_merged_users(
    *,
    variables: dict[str, Any] | None = None,
    roles_dir: str | os.PathLike[str] | None = None,
    templar: Any = None,
) -> dict[str, Any]:
    source_variables = variables
    variables = dict(variables or {})
    if templar is not None:
        templar_avail = getattr(templar, "available_variables", None) or {}
        for key in ("DOMAIN_PRIMARY", "SYSTEM_EMAIL_DOMAIN"):
            if not variables.get(key) and templar_avail.get(key):
                variables[key] = templar_avail[key]
    if not variables.get("DOMAIN_PRIMARY") and variables.get("SYSTEM_EMAIL_DOMAIN"):
        variables["DOMAIN_PRIMARY"] = variables["SYSTEM_EMAIL_DOMAIN"]

    resolved_roles_dir = _resolve_roles_dir(roles_dir=roles_dir)
    tokens_file = _resolve_tokens_file(variables)
    cache_key = (
        _cache_key(resolved_roles_dir),
        _stable_variables_signature(source_variables),
        _tokens_file_signature(tokens_file),
        templar is not None,
    )
    cached = _MERGED_USERS_CACHE.get(cache_key)
    if cached is not None:
        return cached

    defaults = get_user_defaults(roles_dir=roles_dir)
    overrides = _resolve_override_mapping(variables, "users", templar=templar)

    merged = _apply_account_defaults(_merge_users(defaults, overrides))
    hydrated = _hydrate_users_tokens(
        merged,
        _load_store_users(tokens_file),
    )

    if getattr(_RENDER_GUARD, "users", False):
        return hydrated

    _RENDER_GUARD.users = True
    try:
        materialized = _materialize_domain_label_reservations(
            hydrated,
            variables,
            templar=templar,
        )
        materialized = _substitute_primary_domain_placeholder(
            materialized, variables, templar=templar
        )
        materialized = _substitute_scalar_placeholders(
            materialized, variables, templar=templar
        )
        rendered = _render_with_templar(
            materialized,
            templar=templar,
            variables=variables,
            raw_users=materialized,
        )
    finally:
        _RENDER_GUARD.users = False

    _MERGED_USERS_CACHE[cache_key] = rendered
    return rendered


def _reset() -> None:
    _USERS_DEFAULTS_CACHE.clear()
    _MERGED_USERS_CACHE.clear()