community.general/plugins/module_utils/_xml.py

# Copyright (c) 2014, Red Hat, Inc.
# Copyright (c) 2014, Tim Bielawa <tbielawa@redhat.com>
# Copyright (c) 2014, Magnus Hedemark <mhedemar@redhat.com>
# Copyright (c) 2017, Dag Wieers <dag@wieers.com>
# Copyright (c) 2026, Shreyash Bhosale <shreyashpb16@gmail.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

# Note that this module util is **PRIVATE** to the collection. It can have breaking changes at any time.
# Do not use this from other collections or standalone plugins/modules!

from __future__ import annotations

import json
import os
import typing as t
from io import BytesIO

from ansible.module_utils.common.text.converters import to_bytes

from ansible_collections.community.general.plugins.module_utils import _deps as deps
from ansible_collections.community.general.plugins.module_utils._version import LooseVersion

if t.TYPE_CHECKING:
    from ansible.module_utils.basic import AnsibleModule

etree: t.Any = None
with deps.declare("lxml"):
    from lxml import etree  # type: ignore[no-redef]


def check_lxml(module: AnsibleModule) -> None:
    deps.validate(module, "lxml")
    version_str = ".".join(str(f) for f in etree.LXML_VERSION)
    if LooseVersion(version_str) < LooseVersion("2.3.0"):
        module.fail_json(msg="The xml ansible module requires lxml 2.3.0 or newer installed on the managed machine")
    elif LooseVersion(version_str) < LooseVersion("3.0.0"):
        module.warn("Using lxml version lower than 3.0.0 does not guarantee predictable element attribute order.")


def validate_xpath(module: AnsibleModule, xpath: str) -> None:
    try:
        etree.XPath(xpath)
    except etree.XPathSyntaxError as e:
        module.fail_json(msg=f"Syntax error in xpath expression: {xpath} ({e})")
    except etree.XPathEvalError as e:
        module.fail_json(msg=f"Evaluation error in xpath expression: {xpath} ({e})")


def parse_xml_doc(
    module: AnsibleModule,
    xml_file: str | None = None,
    xml_string: str | None = None,
    strip_cdata_tags: bool = False,
    huge_tree: bool = False,
    remove_blank_text: bool = False,
    resolve_entities: bool = True,
) -> t.Any:
    infile: t.IO[bytes] | None = None
    try:
        if xml_string:
            infile = BytesIO(to_bytes(xml_string, errors="surrogate_or_strict"))
        elif xml_file and os.path.isfile(xml_file):
            infile = open(xml_file, "rb")  # noqa: SIM115
        else:
            module.fail_json(msg=f"The target XML source '{xml_file}' does not exist.")

        try:
            parser = etree.XMLParser(
                remove_blank_text=remove_blank_text,
                strip_cdata=strip_cdata_tags,
                huge_tree=huge_tree,
                resolve_entities=resolve_entities,
            )
            doc = etree.parse(infile, parser)
        except etree.XMLSyntaxError as e:
            module.fail_json(msg=f"Error while parsing document: {xml_file or 'xml_string'} ({e})")
    finally:
        if infile:
            infile.close()

    return doc


def xpath_matches(tree: t.Any, xpath: str, namespaces: dict) -> bool:
    """Test if a node exists."""
    return bool(tree.xpath(xpath, namespaces=namespaces))


def is_node(tree: t.Any, xpath: str, namespaces: dict) -> bool:
    """Test if a given xpath matches anything and if that match is a node."""
    if xpath_matches(tree, xpath, namespaces):
        match = tree.xpath(xpath, namespaces=namespaces)
        if isinstance(match[0], etree._Element):
            return True
    return False


def get_matches(tree: t.Any, xpath: str, namespaces: dict) -> dict:
    """Return matched XPath paths."""
    match = tree.xpath(xpath, namespaces=namespaces)
    match_xpaths = [tree.getpath(m) for m in match]
    match_str = json.dumps(match_xpaths)
    msg = f"selector '{xpath}' match: {match_str}"
    return {"msg": msg, "matches": match_xpaths}


def count_matches(tree: t.Any, xpath: str, namespaces: dict) -> dict:
    """Return the count of nodes matching the xpath."""
    hits = len(tree.xpath(xpath, namespaces=namespaces))
    msg = f"found {hits} nodes"
    return {"msg": msg, "count": hits}


def collect_element_text(tree: t.Any, xpath: str, namespaces: dict) -> list | None:
    """Get text content of matched elements. Returns None if xpath does not match a node."""
    if not is_node(tree, xpath, namespaces):
        return None
    return [{element.tag: element.text} for element in tree.xpath(xpath, namespaces=namespaces)]


def collect_element_attr(tree: t.Any, xpath: str, namespaces: dict) -> list | None:
    """Get attributes of matched elements. Returns None if xpath does not match a node."""
    if not is_node(tree, xpath, namespaces):
        return None
    elements = []
    for element in tree.xpath(xpath, namespaces=namespaces):
        elements.append({element.tag: dict(element.attrib)})
    return elements