#!/usr/bin/env python3

# ***********************IMPORTANT NMAP LICENSE TERMS************************
# *
# * The Nmap Security Scanner is (C) 1996-2026 Nmap Software LLC ("The Nmap
# * Project"). Nmap is also a registered trademark of the Nmap Project.
# *
# * This program is distributed under the terms of the Nmap Public Source
# * License (NPSL). The exact license text applying to a particular Nmap
# * release or source code control revision is contained in the LICENSE
# * file distributed with that version of Nmap or source code control
# * revision. More Nmap copyright/legal information is available from
# * https://nmap.org/book/man-legal.html, and further information on the
# * NPSL license itself can be found at https://nmap.org/npsl/ . This
# * header summarizes some key points from the Nmap license, but is no
# * substitute for the actual license text.
# *
# * Nmap is generally free for end users to download and use themselves,
# * including commercial use. It is available from https://nmap.org.
# *
# * The Nmap license generally prohibits companies from using and
# * redistributing Nmap in commercial products, but we sell a special Nmap
# * OEM Edition with a more permissive license and special features for
# * this purpose. See https://nmap.org/oem/
# *
# * If you have received a written Nmap license agreement or contract
# * stating terms other than these (such as an Nmap OEM license), you may
# * choose to use and redistribute Nmap under those terms instead.
# *
# * The official Nmap Windows builds include the Npcap software
# * (https://npcap.com) for packet capture and transmission. It is under
# * separate license terms which forbid redistribution without special
# * permission. So the official Nmap Windows builds may not be redistributed
# * without special permission (such as an Nmap OEM license).
# *
# * Source is provided to this software because we believe users have a
# * right to know exactly what a program is going to do before they run it.
# * This also allows you to audit the software for security holes.
# *
# * Source code also allows you to port Nmap to new platforms, fix bugs, and
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# * is understood that you are offering us very broad rights to use your
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# * with various terms, and also because the inability to relicense code has
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# * Npcap OEM program--see https://nmap.org/oem/
# *
# ***************************************************************************/

from configparser import ConfigParser, DEFAULTSECT, NoOptionError, \
        NoSectionError
from contextlib import contextmanager
from zenmapCore.UmitLogging import log


class UmitConfigParser(ConfigParser):

    def __init__(self, *args):
        self.filenames = None
        self.failed = False
        ConfigParser.__init__(self, *args)

    @contextmanager
    def section_transaction(self, section):
        section_existed = self.has_section(section)
        if section_existed:
            section_copy = dict(self.items(section, raw=True))
        try:
            yield self
        except Exception:
            if self.has_section(section):
                try:
                    self.remove_section(section)
                except Exception:
                    pass
            if section_existed:
                try:
                    self.add_section(section)
                    self[section].update(section_copy)
                except Exception:
                    pass
            raise

    def set(self, section, option, value):
        if not self.has_section(section):
            self.add_section(section)

        ConfigParser.set(self, section, option, str(value))
        self.save_changes()

    def read(self, filename):
        log.debug(">>> Trying to parse: %s" % filename)

        for enc in ('utf-8', None):
            try:
                if ConfigParser.read(self, filename, encoding=enc):
                    self.filenames = filename
            except UnicodeDecodeError:
                continue
            break

        return self.filenames

    def save_changes(self):
        if self.filenames:
            log.debug("saving to %s" % self.filenames)
            try:
                with open(self.filenames, 'w', encoding="utf-8") as fp:
                    self.write(fp)
            except Exception as e:
                self.failed = e
                log.error(">>> Can't save to %s: %s" % (self.filenames, e))
                return
            self.failed = False
        else:
            log.debug(">>> UmitConfigParser can't save changes: no filename")

    def write(self, fp):
        '''Write alphabetically sorted config files'''
        if self._defaults:
            fp.write("[%s]\n" % DEFAULTSECT)

            items = sorted(self._defaults.items())

            for (key, value) in items:
                fp.write("%s = %s\n" % (key, str(value).replace('\n', '\n\t')))
            fp.write("\n")

        sects = sorted(self._sections.keys())

        for section in sects:
            fp.write("[%s]\n" % section)
            for (key, value) in self._sections[section].items():
                if key != "__name__":
                    fp.write("%s = %s\n" %
                             (key, str(value).replace('\n', '\n\t')))
            fp.write("\n")


def test_umit_conf_content(filename):
    parser = ConfigParser()
    parser.read(filename)

    # Paths section
    section = "paths"
    assert get_or_false(parser, section, "nmap_command_path")


def get_or_false(parser, section, option):
    try:
        result = parser.get(section, option)
        return result
    except NoOptionError:
        return False
    except NoSectionError:
        return False
