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## Amazon S3 manager
## Author: Michal Ludvig <michal@logix.cz>
##         http://www.logix.cz/michal
## License: GPL Version 2

import logging
from logging import debug, info, warning, error
import re

class Config(object):
      _instance = None
      _parsed_files = []
      _doc = {}
      access_key = ""
      secret_key = ""
      host_base = "s3.amazonaws.com"
      host_bucket = "%(bucket)s.s3.amazonaws.com"
      verbosity = logging.WARNING
      send_chunk = 4096
      recv_chunk = 4096
      human_readable_sizes = False
      force = False
      acl_public = False
      proxy_host = ""
      proxy_port = 3128
      encrypt = False
      dry_run = False
      preserve_attrs = True
      preserve_attrs_list = [ 
            'uname',    # Verbose owner Name (e.g. 'root')
            #'uid',           # Numeric user ID (e.g. 0)
            'gname',    # Group name (e.g. 'users')
            #'gid',           # Numeric group ID (e.g. 100)
            'mtime',    # Modification timestamp
            'ctime',    # Creation timestamp
            'mode',           # File mode (e.g. rwxr-xr-x = 755)
            #'acl',           # Full ACL (not yet supported)
      delete_removed = False
      _doc['delete_removed'] = "[sync] Remove remote S3 objects when local file has been deleted"
      gpg_passphrase = ""
      gpg_command = ""
      gpg_encrypt = "%(gpg_command)s -c --verbose --no-use-agent --batch --yes --passphrase-fd %(passphrase_fd)s -o %(output_file)s %(input_file)s"
      gpg_decrypt = "%(gpg_command)s -d --verbose --no-use-agent --batch --yes --passphrase-fd %(passphrase_fd)s -o %(output_file)s %(input_file)s"
      use_https = False
      bucket_location = "US"

      ## Creating a singleton
      def __new__(self, configfile = None):
            if self._instance is None:
                  self._instance = object.__new__(self)
            return self._instance

      def __init__(self, configfile = None):
            if configfile:

      def option_list(self):
            retval = []
            for option in dir(self):
                  ## Skip attributes that start with underscore or are not string, int or bool
                  option_type = type(getattr(Config, option))
                  if option.startswith("_") or \
                     not (option_type in (
                              type("string"),   # str
                              type(42),   # int
                              type(True))):     # bool
            return retval

      def read_config_file(self, configfile):
            cp = ConfigParser(configfile)
            for option in self.option_list():
                  self.update_option(option, cp.get(option))

      def dump_config(self, stream):
            ConfigDumper(stream).dump("default", self)

      def update_option(self, option, value):
            if value is None:
            #### Special treatment of some options
            ## verbosity must be known to "logging" module
            if option == "verbosity":
                        setattr(Config, "verbosity", logging._levelNames[value])
                  except KeyError:
                        error("Config: verbosity level '%s' is not valid" % value)
            ## allow yes/no, true/false, on/off and 1/0 for boolean options
            elif type(getattr(Config, option)) is type(True):     # bool
                  if str(value).lower() in ("true", "yes", "on", "1"):
                        setattr(Config, option, True)
                  elif str(value).lower() in ("false", "no", "off", "0"):
                        setattr(Config, option, False)
                        error("Config: value of option '%s' must be Yes or No, not '%s'" % (option, value))
            elif type(getattr(Config, option)) is type(42):       # int
                        setattr(Config, option, int(value))
                  except ValueError, e:
                        error("Config: value of option '%s' must be an integer, not '%s'" % (option, value))
            else:                                     # string
                  setattr(Config, option, value)

class ConfigParser(object):
      def __init__(self, file, sections = []):
            self.cfg = {}
            self.parse_file(file, sections)
      def parse_file(self, file, sections = []):
            info("ConfigParser: Reading file '%s'" % file)
            if type(sections) != type([]):
                  sections = [sections]
            in_our_section = True
            f = open(file, "r")
            r_comment = re.compile("^\s*#.*")
            r_empty = re.compile("^\s*$")
            r_section = re.compile("^\[([^\]]+)\]")
            r_data = re.compile("^\s*(?P<key>\w+)\s*=\s*(?P<value>.*)")
            r_quotes = re.compile("^\"(.*)\"\s*$")
            for line in f:
                  if r_comment.match(line) or r_empty.match(line):
                  is_section = r_section.match(line)
                  if is_section:
                        section = is_section.groups()[0]
                        in_our_section = (section in sections) or (len(sections) == 0)
                  is_data = r_data.match(line)
                  if is_data and in_our_section:
                        data = is_data.groupdict()
                        if r_quotes.match(data["value"]):
                              data["value"] = data["value"][1:-1]
                        self.__setitem__(data["key"], data["value"])
                        if data["key"] in ("access_key", "secret_key", "gpg_passphrase"):
                              print_value = (data["value"][:2]+"...%d_chars..."+data["value"][-1:]) % (len(data["value"]) - 3)
                              print_value = data["value"]
                        debug("ConfigParser: %s->%s" % (data["key"], print_value))
                  warning("Ignoring invalid line in '%s': %s" % (file, line))

      def __getitem__(self, name):
            return self.cfg[name]
      def __setitem__(self, name, value):
            self.cfg[name] = value
      def get(self, name, default = None):
            if self.cfg.has_key(name):
                  return self.cfg[name]
            return default

class ConfigDumper(object):
      def __init__(self, stream):
            self.stream = stream

      def dump(self, section, config):
            self.stream.write("[%s]\n" % section)
            for option in config.option_list():
                  self.stream.write("%s = %s\n" % (option, getattr(config, option)))

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