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Viewing File: parser.py

# -*- coding: utf-8 -*-
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2025 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#
"""Parsing and serialization functions for crontab entries."""

from .constants import (
    CRON_SCHEDULE_PATTERN,
    WEBSITE_CRON_BEGIN_PATTERN,
    WEBSITE_CRON_END_PATTERN,
)
from .structure import (
    BeginWebsite,
    CommentLine,
    CrontabEntry,
    CrontabStructure,
    EndWebsite,
    ParsedCrontabLine,
)


def parse_crontab_line(line: bytes) -> CrontabEntry:
    """
    Parse a crontab line into a cron entry, comment, or website marker.

    Args:
        line: A single line from crontab output (bytes)

    """
    stripped = line.strip()

    # Check for website cron begin marker
    begin_match = WEBSITE_CRON_BEGIN_PATTERN.match(stripped)
    if begin_match:
        docroot_bytes = begin_match.group(1).strip()
        docroot = docroot_bytes.decode("utf-8", errors="replace")
        return BeginWebsite(docroot=docroot)

    # Check for website cron end marker
    if WEBSITE_CRON_END_PATTERN.match(stripped):
        return EndWebsite()

    # Handle empty lines and comments
    if not stripped:
        return CommentLine(content=line)
    if stripped.startswith(b"#"):
        return CommentLine(content=line)

    # Try to match cron schedule + command
    schedule_match = CRON_SCHEDULE_PATTERN.match(stripped)
    if not schedule_match:
        return CommentLine(content=line)

    schedule = schedule_match.group(1)
    command = schedule_match.group(2)

    if line.endswith(b"\n"):
        command += b"\n"

    return ParsedCrontabLine(
        schedule=schedule,
        command=command,
    )


def parse_crontab_structure(input_data: bytes) -> CrontabStructure:
    """
    Parse crontab file into structured format with user records and docroot sections.

    Supports both old format (with isolation wrapper prefixes) and new format
    (with section markers).

    Args:
        input_data: bytes containing crontab entries

    Returns:
        CrontabStructure: Structure containing global_records and docroot_sections
    """

    lines = input_data.splitlines(keepends=True)

    crontab_records: dict[
        str | None,
        list[CrontabEntry],
    ] = {}
    current_docroot: str | None = None

    for line in lines:
        parsed = parse_crontab_line(line)

        if isinstance(parsed, BeginWebsite):
            current_docroot = parsed.docroot
            continue

        if isinstance(parsed, EndWebsite):
            current_docroot = None
            continue

        crontab_records.setdefault(current_docroot, []).append(parsed)

    global_records = crontab_records.pop(None, [])
    return CrontabStructure(
        global_records=global_records,
        docroot_sections=crontab_records,
    )


def write_crontab_structure(structure: CrontabStructure) -> bytes:
    """
    Write crontab structure to bytes in new format.

    Format:
    - User records at the top
    - Then docroot sections with markers:
      ## WEBSITE CRON BEGIN /path/to/docroot
      ... entries ...
      ## WEBSITE CRON END

    Args:
        structure: CrontabStructure with user_records and docroot_sections

    Returns:
        bytes: Crontab content in new format
    """
    result_parts = entries_to_str_list(structure.global_records)

    # Add docroot sections (preserve insertion order)
    for docroot in structure.docroot_sections.keys():
        entries = structure.docroot_sections[docroot]
        if not entries:
            continue
        result_parts.append(f"## WEBSITE CRON BEGIN {docroot}\n".encode("utf-8"))
        result_parts.extend(entries_to_str_list(entries))
        result_parts.append(b"## WEBSITE CRON END\n")

    return b"".join(result_parts)


def entries_to_str_list(entries: list[CrontabEntry], without_wrapper: bool = False) -> list[bytes]:
    """
    Converts parsed crontab entries into a string list.
    """
    lines = []
    for entry in entries:
        if isinstance(entry, ParsedCrontabLine):
            line = (
                entry.schedule
                + b" "
                + (entry.get_clean_command() if without_wrapper else entry.command)
            )
            if not line.endswith(b"\n"):
                line += b"\n"
            lines.append(line)
        elif isinstance(entry, CommentLine):
            lines.append(entry.content)
    return lines
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