roundup/configuration.py

   1 # Roundup Issue Tracker configuration support
   2 #
   3 # $Id: configuration.py,v 1.51 2008-09-01 02:30:06 richard Exp $
   4 #
   5 __docformat__ = "restructuredtext"
   6
   7 import ConfigParser
   8 import getopt
   9 import imp
  10 import logging, logging.config
  11 import os
  12 import re
  13 import sys
  14 import time
  15 import smtplib
  16
  17 import roundup.date
  18
  19 # XXX i don't think this module needs string translation, does it?
  20
  21 ### Exceptions
  22
  23 class ConfigurationError(Exception):
  24     pass
  25
  26 class NoConfigError(ConfigurationError):
  27
  28     """Raised when configuration loading fails
  29
  30     Constructor parameters: path to the directory that was used as HOME
  31
  32     """
  33
  34     def __str__(self):
  35         return "No valid configuration files found in directory %s" \
  36             % self.args[0]
  37
  38 class InvalidOptionError(ConfigurationError, KeyError, AttributeError):
  39
  40     """Attempted access to non-existing configuration option
  41
  42     Configuration options may be accessed as configuration object
  43     attributes or items.  So this exception instances also are
  44     instances of KeyError (invalid item access) and AttributeError
  45     (invalid attribute access).
  46
  47     Constructor parameter: option name
  48
  49     """
  50
  51     def __str__(self):
  52         return "Unsupported configuration option: %s" % self.args[0]
  53
  54 class OptionValueError(ConfigurationError, ValueError):
  55
  56     """Raised upon attempt to assign an invalid value to config option
  57
  58     Constructor parameters: Option instance, offending value
  59     and optional info string.
  60
  61     """
  62
  63     def __str__(self):
  64         _args = self.args
  65         _rv = "Invalid value for %(option)s: %(value)r" % {
  66             "option": _args[0].name, "value": _args[1]}
  67         if len(_args) > 2:
  68             _rv += "\n".join(("",) + _args[2:])
  69         return _rv
  70
  71 class OptionUnsetError(ConfigurationError):
  72
  73     """Raised when no Option value is available - neither set, nor default
  74
  75     Constructor parameters: Option instance.
  76
  77     """
  78
  79     def __str__(self):
  80         return "%s is not set and has no default" % self.args[0].name
  81
  82 class UnsetDefaultValue:
  83
  84     """Special object meaning that default value for Option is not specified"""
  85
  86     def __str__(self):
  87         return "NO DEFAULT"
  88
  89 NODEFAULT = UnsetDefaultValue()
  90
  91 ### Option classes
  92
  93 class Option:
  94
  95     """Single configuration option.
  96
  97     Options have following attributes:
  98
  99         config
 100             reference to the containing Config object
 101         section
 102             name of the section in the tracker .ini file
 103         setting
 104             option name in the tracker .ini file
 105         default
 106             default option value
 107         description
 108             option description.  Makes a comment in the tracker .ini file
 109         name
 110             "canonical name" of the configuration option.
 111             For items in the 'main' section this is uppercased
 112             'setting' name.  For other sections, the name is
 113             composed of the section name and the setting name,
 114             joined with underscore.
 115         aliases
 116             list of "also known as" names.  Used to access the settings
 117             by old names used in previous Roundup versions.
 118             "Canonical name" is also included.
 119
 120     The name and aliases are forced to be uppercase.
 121     The setting name is forced to lowercase.
 122
 123     """
 124
 125     class_description = None
 126
 127     def __init__(self, config, section, setting,
 128         default=NODEFAULT, description=None, aliases=None
 129     ):
 130         self.config = config
 131         self.section = section
 132         self.setting = setting.lower()
 133         self.default = default
 134         self.description = description
 135         self.name = setting.upper()
 136         if section != "main":
 137             self.name = "_".join((section.upper(), self.name))
 138         if aliases:
 139             self.aliases = [alias.upper() for alias in list(aliases)]
 140         else:
 141             self.aliases = []
 142         self.aliases.insert(0, self.name)
 143         # convert default to internal representation
 144         if default is NODEFAULT:
 145             _value = default
 146         else:
 147             _value = self.str2value(default)
 148         # value is private.  use get() and set() to access
 149         self._value = self._default_value = _value
 150
 151     def str2value(self, value):
 152         """Return 'value' argument converted to internal representation"""
 153         return value
 154
 155     def _value2str(self, value):
 156         """Return 'value' argument converted to external representation
 157
 158         This is actual conversion method called only when value
 159         is not NODEFAULT.  Heirs with different conversion rules
 160         override this method, not the public .value2str().
 161
 162         """
 163         return str(value)
 164
 165     def value2str(self, value=NODEFAULT, current=0):
 166         """Return 'value' argument converted to external representation
 167
 168         If 'current' is True, use current option value.
 169
 170         """
 171         if current:
 172             value = self._value
 173         if value is NODEFAULT:
 174             return str(value)
 175         else:
 176             return self._value2str(value)
 177
 178     def get(self):
 179         """Return current option value"""
 180         if self._value is NODEFAULT:
 181             raise OptionUnsetError(self)
 182         return self._value
 183
 184     def set(self, value):
 185         """Update the value"""
 186         self._value = self.str2value(value)
 187
 188     def reset(self):
 189         """Reset the value to default"""
 190         self._value = self._default_value
 191
 192     def isdefault(self):
 193         """Return True if current value is the default one"""
 194         return self._value == self._default_value
 195
 196     def isset(self):
 197         """Return True if the value is available (either set or default)"""
 198         return self._value != NODEFAULT
 199
 200     def __str__(self):
 201         return self.value2str(self._value)
 202
 203     def __repr__(self):
 204         if self.isdefault():
 205             _format = "<%(class)s %(name)s (default): %(value)s>"
 206         else:
 207             _format = "<%(class)s %(name)s (default: %(default)s): %(value)s>"
 208         return _format % {
 209             "class": self.__class__.__name__,
 210             "name": self.name,
 211             "default": self.value2str(self._default_value),
 212             "value": self.value2str(self._value),
 213         }
 214
 215     def format(self):
 216         """Return .ini file fragment for this option"""
 217         _desc_lines = []
 218         for _description in (self.description, self.class_description):
 219             if _description:
 220                 _desc_lines.extend(_description.split("\n"))
 221         # comment out the setting line if there is no value
 222         if self.isset():
 223             _is_set = ""
 224         else:
 225             _is_set = "#"
 226         _rv = "# %(description)s\n# Default: %(default)s\n" \
 227             "%(is_set)s%(name)s = %(value)s\n" % {
 228                 "description": "\n# ".join(_desc_lines),
 229                 "default": self.value2str(self._default_value),
 230                 "name": self.setting,
 231                 "value": self.value2str(self._value),
 232                 "is_set": _is_set
 233             }
 234         return _rv
 235
 236     def load_ini(self, config):
 237         """Load value from ConfigParser object"""
 238         if config.has_option(self.section, self.setting):
 239             self.set(config.get(self.section, self.setting))
 240
 241     def load_pyconfig(self, config):
 242         """Load value from old-style config (python module)"""
 243         for _name in self.aliases:
 244             if hasattr(config, _name):
 245                 self.set(getattr(config, _name))
 246                 break
 247
 248 class BooleanOption(Option):
 249
 250     """Boolean option: yes or no"""
 251
 252     class_description = "Allowed values: yes, no"
 253
 254     def _value2str(self, value):
 255         if value:
 256             return "yes"
 257         else:
 258             return "no"
 259
 260     def str2value(self, value):
 261         if type(value) == type(""):
 262             _val = value.lower()
 263             if _val in ("yes", "true", "on", "1"):
 264                 _val = 1
 265             elif _val in ("no", "false", "off", "0"):
 266                 _val = 0
 267             else:
 268                 raise OptionValueError(self, value, self.class_description)
 269         else:
 270             _val = value and 1 or 0
 271         return _val
 272
 273 class WordListOption(Option):
 274
 275     """List of strings"""
 276
 277     class_description = "Allowed values: comma-separated list of words"
 278
 279     def _value2str(self, value):
 280         return ','.join(value)
 281
 282     def str2value(self, value):
 283         return value.split(',')
 284
 285 class RunDetectorOption(Option):
 286
 287     """When a detector is run: always, never or for new items only"""
 288
 289     class_description = "Allowed values: yes, no, new"
 290
 291     def str2value(self, value):
 292         _val = value.lower()
 293         if _val in ("yes", "no", "new"):
 294             return _val
 295         else:
 296             raise OptionValueError(self, value, self.class_description)
 297
 298 class MailAddressOption(Option):
 299
 300     """Email address
 301
 302     Email addresses may be either fully qualified or local.
 303     In the latter case MAIL_DOMAIN is automatically added.
 304
 305     """
 306
 307     def get(self):
 308         _val = Option.get(self)
 309         if "@" not in _val:
 310             _val = "@".join((_val, self.config["MAIL_DOMAIN"]))
 311         return _val
 312
 313 class FilePathOption(Option):
 314
 315     """File or directory path name
 316
 317     Paths may be either absolute or relative to the HOME.
 318
 319     """
 320
 321     class_description = "The path may be either absolute or relative\n" \
 322         "to the directory containig this config file."
 323
 324     def get(self):
 325         _val = Option.get(self)
 326         if _val and not os.path.isabs(_val):
 327             _val = os.path.join(self.config["HOME"], _val)
 328         return _val
 329
 330 class FloatNumberOption(Option):
 331
 332     """Floating point numbers"""
 333
 334     def str2value(self, value):
 335         try:
 336             return float(value)
 337         except ValueError:
 338             raise OptionValueError(self, value,
 339                 "Floating point number required")
 340
 341     def _value2str(self, value):
 342         _val = str(value)
 343         # strip fraction part from integer numbers
 344         if _val.endswith(".0"):
 345             _val = _val[:-2]
 346         return _val
 347
 348 class IntegerNumberOption(Option):
 349
 350     """Integer numbers"""
 351
 352     def str2value(self, value):
 353         try:
 354             return int(value)
 355         except ValueError:
 356             raise OptionValueError(self, value, "Integer number required")
 357
 358 class OctalNumberOption(Option):
 359
 360     """Octal Integer numbers"""
 361
 362     def str2value(self, value):
 363         try:
 364             return int(value, 8)
 365         except ValueError:
 366             raise OptionValueError(self, value, "Octal Integer number required")
 367
 368     def _value2str(self, value):
 369         return oct(value)
 370
 371 class NullableOption(Option):
 372
 373     """Option that is set to None if its string value is one of NULL strings
 374
 375     Default nullable strings list contains empty string only.
 376     There is constructor parameter allowing to specify different nullables.
 377
 378     Conversion to external representation returns the first of the NULL
 379     strings list when the value is None.
 380
 381     """
 382
 383     NULL_STRINGS = ("",)
 384
 385     def __init__(self, config, section, setting,
 386         default=NODEFAULT, description=None, aliases=None,
 387         null_strings=NULL_STRINGS
 388     ):
 389         self.null_strings = list(null_strings)
 390         Option.__init__(self, config, section, setting, default,
 391             description, aliases)
 392
 393     def str2value(self, value):
 394         if value in self.null_strings:
 395             return None
 396         else:
 397             return value
 398
 399     def _value2str(self, value):
 400         if value is None:
 401             return self.null_strings[0]
 402         else:
 403             return value
 404
 405 class NullableFilePathOption(NullableOption, FilePathOption):
 406
 407     # .get() and class_description are from FilePathOption,
 408     get = FilePathOption.get
 409     class_description = FilePathOption.class_description
 410     # everything else taken from NullableOption (inheritance order)
 411
 412 class TimezoneOption(Option):
 413
 414     class_description = \
 415         "If pytz module is installed, value may be any valid\n" \
 416         "timezone specification (e.g. EET or Europe/Warsaw).\n" \
 417         "If pytz is not installed, value must be integer number\n" \
 418         "giving local timezone offset from UTC in hours."
 419
 420     def str2value(self, value):
 421         try:
 422             roundup.date.get_timezone(value)
 423         except KeyError:
 424             raise OptionValueError(self, value,
 425                     "Timezone name or numeric hour offset required")
 426         return value
 427
 428 class RegExpOption(Option):
 429
 430     """Regular Expression option (value is Regular Expression Object)"""
 431
 432     class_description = "Value is Python Regular Expression (UTF8-encoded)."
 433
 434     RE_TYPE = type(re.compile(""))
 435
 436     def __init__(self, config, section, setting,
 437         default=NODEFAULT, description=None, aliases=None,
 438         flags=0,
 439     ):
 440         self.flags = flags
 441         Option.__init__(self, config, section, setting, default,
 442             description, aliases)
 443
 444     def _value2str(self, value):
 445         assert isinstance(value, self.RE_TYPE)
 446         return value.pattern
 447
 448     def str2value(self, value):
 449         if not isinstance(value, unicode):
 450             value = str(value)
 451             # if it is 7-bit ascii, use it as string,
 452             # otherwise convert to unicode.
 453             try:
 454                 value.decode("ascii")
 455             except UnicodeError:
 456                 value = value.decode("utf-8")
 457         return re.compile(value, self.flags)
 458
 459 ### Main configuration layout.
 460 # Config is described as a sequence of sections,
 461 # where each section name is followed by a sequence
 462 # of Option definitions.  Each Option definition
 463 # is a sequence containing class name and constructor
 464 # parameters, starting from the setting name:
 465 # setting, default, [description, [aliases]]
 466 # Note: aliases should only exist in historical options for backwards
 467 # compatibility - new options should *not* have aliases!
 468 SETTINGS = (
 469     ("main", (
 470         (FilePathOption, "database", "db", "Database directory path."),
 471         (FilePathOption, "templates", "html",
 472             "Path to the HTML templates directory."),
 473         (NullableFilePathOption, "static_files", "",
 474             "Path to directory holding additional static files\n"
 475             "available via Web UI.  This directory may contain\n"
 476             "sitewide images, CSS stylesheets etc. and is searched\n"
 477             "for these files prior to the TEMPLATES directory\n"
 478             "specified above.  If this option is not set, all static\n"
 479             "files are taken from the TEMPLATES directory"),
 480         (MailAddressOption, "admin_email", "roundup-admin",
 481             "Email address that roundup will complain to if it runs\n"
 482             "into trouble.\n"
 483             "If no domain is specified then the config item\n"
 484             "mail -> domain is added."),
 485         (MailAddressOption, "dispatcher_email", "roundup-admin",
 486             "The 'dispatcher' is a role that can get notified\n"
 487             "of new items to the database.\n"
 488             "It is used by the ERROR_MESSAGES_TO config setting.\n"
 489             "If no domain is specified then the config item\n"
 490             "mail -> domain is added."),
 491         (Option, "email_from_tag", "",
 492             "Additional text to include in the \"name\" part\n"
 493             "of the From: address used in nosy messages.\n"
 494             "If the sending user is \"Foo Bar\", the From: line\n"
 495             "is usually: \"Foo Bar\" <issue_tracker@tracker.example>\n"
 496             "the EMAIL_FROM_TAG goes inside the \"Foo Bar\" quotes like so:\n"
 497             "\"Foo Bar EMAIL_FROM_TAG\" <issue_tracker@tracker.example>"),
 498         (Option, "new_web_user_roles", "User",
 499             "Roles that a user gets when they register"
 500             " with Web User Interface.\n"
 501             "This is a comma-separated string of role names"
 502             " (e.g. 'Admin,User')."),
 503         (Option, "new_email_user_roles", "User",
 504             "Roles that a user gets when they register"
 505             " with Email Gateway.\n"
 506             "This is a comma-separated string of role names"
 507             " (e.g. 'Admin,User')."),
 508         (Option, "error_messages_to", "user",
 509             # XXX This description needs better wording,
 510             #   with explicit allowed values list.
 511             "Send error message emails to the dispatcher, user, or both?\n"
 512             "The dispatcher is configured using the DISPATCHER_EMAIL"
 513             " setting."),
 514         (Option, "html_version", "html4",
 515             "HTML version to generate. The templates are html4 by default.\n"
 516             "If you wish to make them xhtml, then you'll need to change this\n"
 517             "var to 'xhtml' too so all auto-generated HTML is compliant.\n"
 518             "Allowed values: html4, xhtml"),
 519         (TimezoneOption, "timezone", "UTC", "Default timezone offset,"
 520             " applied when user's timezone is not set.",
 521             ["DEFAULT_TIMEZONE"]),
 522         (BooleanOption, "instant_registration", "no",
 523             "Register new users instantly, or require confirmation via\n"
 524             "email?"),
 525         (BooleanOption, "email_registration_confirmation", "yes",
 526             "Offer registration confirmation by email or only through the web?"),
 527         (WordListOption, "indexer_stopwords", "",
 528             "Additional stop-words for the full-text indexer specific to\n"
 529             "your tracker. See the indexer source for the default list of\n"
 530             "stop-words (eg. A,AND,ARE,AS,AT,BE,BUT,BY, ...)"),
 531         (OctalNumberOption, "umask", "02",
 532             "Defines the file creation mode mask."),
 533         (IntegerNumberOption, 'csv_field_size', '131072',
 534             "Maximum size of a csv-field during import. Roundups export\n"
 535             "format is a csv (comma separated values) variant. The csv\n"
 536             "reader has a limit on the size of individual fields\n"
 537             "starting with python 2.5. Set this to a higher value if you\n"
 538             "get the error 'Error: field larger than field limit' during\n"
 539             "import."),
 540     )),
 541     ("tracker", (
 542         (Option, "name", "Roundup issue tracker",
 543             "A descriptive name for your roundup instance."),
 544         (Option, "web", NODEFAULT,
 545             "The web address that the tracker is viewable at.\n"
 546             "This will be included in information"
 547             " sent to users of the tracker.\n"
 548             "The URL MUST include the cgi-bin part or anything else\n"
 549             "that is required to get to the home page of the tracker.\n"
 550             "You MUST include a trailing '/' in the URL."),
 551         (MailAddressOption, "email", "issue_tracker",
 552             "Email address that mail to roundup should go to.\n"
 553             "If no domain is specified then mail_domain is added."),
 554         (NullableOption, "language", "",
 555             "Default locale name for this tracker.\n"
 556             "If this option is not set, the language is determined\n"
 557             "by OS environment variable LANGUAGE, LC_ALL, LC_MESSAGES,\n"
 558             "or LANG, in that order of preference."),
 559     )),
 560     ("web", (
 561         (BooleanOption, "allow_html_file", "no",
 562             "Setting this option enables Roundup to serve uploaded HTML\n"
 563             "file content *as HTML*. This is a potential security risk\n"
 564             "and is therefore disabled by default. Set to 'yes' if you\n"
 565             "trust *all* users uploading content to your tracker."),
 566         (BooleanOption, 'http_auth', "yes",
 567             "Whether to use HTTP Basic Authentication, if present.\n"
 568             "Roundup will use either the REMOTE_USER or HTTP_AUTHORIZATION\n"
 569             "variables supplied by your web server (in that order).\n"
 570             "Set this option to 'no' if you do not wish to use HTTP Basic\n"
 571             "Authentication in your web interface."),
 572         (BooleanOption, 'use_browser_language', "yes",
 573             "Whether to use HTTP Accept-Language, if present.\n"
 574             "Browsers send a language-region preference list.\n"
 575             "It's usually set in the client's browser or in their\n"
 576             "Operating System.\n"
 577             "Set this option to 'no' if you want to ignore it."),
 578         (BooleanOption, "debug", "no",
 579             "Setting this option makes Roundup display error tracebacks\n"
 580             "in the user's browser rather than emailing them to the\n"
 581             "tracker admin."),
 582     )),
 583     ("rdbms", (
 584         (Option, 'name', 'roundup',
 585             "Name of the database to use.",
 586             ['MYSQL_DBNAME']),
 587         (NullableOption, 'host', 'localhost',
 588             "Database server host.",
 589             ['MYSQL_DBHOST']),
 590         (NullableOption, 'port', '',
 591             "TCP port number of the database server.\n"
 592             "Postgresql usually resides on port 5432 (if any),\n"
 593             "for MySQL default port number is 3306.\n"
 594             "Leave this option empty to use backend default"),
 595         (NullableOption, 'user', 'roundup',
 596             "Database user name that Roundup should use.",
 597             ['MYSQL_DBUSER']),
 598         (NullableOption, 'password', 'roundup',
 599             "Database user password.",
 600             ['MYSQL_DBPASSWORD']),
 601         (NullableOption, 'read_default_file', '~/.my.cnf',
 602             "Name of the MySQL defaults file.\n"
 603             "Only used in MySQL connections."),
 604         (NullableOption, 'read_default_group', 'roundup',
 605             "Name of the group to use in the MySQL defaults file (.my.cnf).\n"
 606             "Only used in MySQL connections."),
 607         (IntegerNumberOption, 'cache_size', '100',
 608             "Size of the node cache (in elements)"),
 609     ), "Settings in this section are used"
 610         " by RDBMS backends only"
 611     ),
 612     ("logging", (
 613         (FilePathOption, "config", "",
 614             "Path to configuration file for standard Python logging module.\n"
 615             "If this option is set, logging configuration is loaded\n"
 616             "from specified file; options 'filename' and 'level'\n"
 617             "in this section are ignored."),
 618         (FilePathOption, "filename", "",
 619             "Log file name for minimal logging facility built into Roundup.\n"
 620             "If no file name specified, log messages are written on stderr.\n"
 621             "If above 'config' option is set, this option has no effect."),
 622         (Option, "level", "ERROR",
 623             "Minimal severity level of messages written to log file.\n"
 624             "If above 'config' option is set, this option has no effect.\n"
 625             "Allowed values: DEBUG, INFO, WARNING, ERROR"),
 626     )),
 627     ("mail", (
 628         (Option, "domain", NODEFAULT,
 629             "The email domain that admin_email, issue_tracker and\n"
 630             "dispatcher_email belong to.\n"
 631             "This domain is added to those config items if they don't\n"
 632             "explicitly include a domain.\n"
 633             "Do not include the '@' symbol."),
 634         (Option, "host", NODEFAULT,
 635             "SMTP mail host that roundup will use to send mail",
 636             ["MAILHOST"],),
 637         (Option, "username", "", "SMTP login name.\n"
 638             "Set this if your mail host requires authenticated access.\n"
 639             "If username is not empty, password (below) MUST be set!"),
 640         (Option, "password", NODEFAULT, "SMTP login password.\n"
 641             "Set this if your mail host requires authenticated access."),
 642         (IntegerNumberOption, "port", smtplib.SMTP_PORT,
 643             "Default port to send SMTP on.\n"
 644             "Set this if your mail server runs on a different port."),
 645         (NullableOption, "local_hostname", '',
 646             "The local hostname to use during SMTP transmission.\n"
 647             "Set this if your mail server requires something specific."),
 648         (BooleanOption, "tls", "no",
 649             "If your SMTP mail host provides or requires TLS\n"
 650             "(Transport Layer Security) then set this option to 'yes'."),
 651         (NullableFilePathOption, "tls_keyfile", "",
 652             "If TLS is used, you may set this option to the name\n"
 653             "of a PEM formatted file that contains your private key."),
 654         (NullableFilePathOption, "tls_certfile", "",
 655             "If TLS is used, you may set this option to the name\n"
 656             "of a PEM formatted certificate chain file."),
 657         (Option, "charset", "utf-8",
 658             "Character set to encode email headers with.\n"
 659             "We use utf-8 by default, as it's the most flexible.\n"
 660             "Some mail readers (eg. Eudora) can't cope with that,\n"
 661             "so you might need to specify a more limited character set\n"
 662             "(eg. iso-8859-1).",
 663             ["EMAIL_CHARSET"]),
 664         (FilePathOption, "debug", "",
 665             "Setting this option makes Roundup to write all outgoing email\n"
 666             "messages to this file *instead* of sending them.\n"
 667             "This option has the same effect as environment variable"
 668             " SENDMAILDEBUG.\nEnvironment variable takes precedence."),
 669         (BooleanOption, "add_authorinfo", "yes",
 670             "Add a line with author information at top of all messages\n"
 671             "sent by roundup"),
 672         (BooleanOption, "add_authoremail", "yes",
 673             "Add the mail address of the author to the author information at\n"
 674             "the top of all messages.\n"
 675             "If this is false but add_authorinfo is true, only the name\n"
 676             "of the actor is added which protects the mail address of the\n"
 677             "actor from being exposed at mail archives, etc."),
 678     ), "Outgoing email options.\nUsed for nozy messages and approval requests"),
 679     ("mailgw", (
 680         (BooleanOption, "keep_quoted_text", "yes",
 681             "Keep email citations when accepting messages.\n"
 682             "Setting this to \"no\" strips out \"quoted\" text"
 683             " from the message.\n"
 684             "Signatures are also stripped.",
 685             ["EMAIL_KEEP_QUOTED_TEXT"]),
 686         (BooleanOption, "leave_body_unchanged", "no",
 687             "Preserve the email body as is - that is,\n"
 688             "keep the citations _and_ signatures.",
 689             ["EMAIL_LEAVE_BODY_UNCHANGED"]),
 690         (Option, "default_class", "issue",
 691             "Default class to use in the mailgw\n"
 692             "if one isn't supplied in email subjects.\n"
 693             "To disable, leave the value blank.",
 694             ["MAIL_DEFAULT_CLASS"]),
 695         (NullableOption, "language", "",
 696             "Default locale name for the tracker mail gateway.\n"
 697             "If this option is not set, mail gateway will use\n"
 698             "the language of the tracker instance."),
 699         (Option, "subject_prefix_parsing", "strict",
 700             "Controls the parsing of the [prefix] on subject\n"
 701             "lines in incoming emails. \"strict\" will return an\n"
 702             "error to the sender if the [prefix] is not recognised.\n"
 703             "\"loose\" will attempt to parse the [prefix] but just\n"
 704             "pass it through as part of the issue title if not\n"
 705             "recognised. \"none\" will always pass any [prefix]\n"
 706             "through as part of the issue title."),
 707         (Option, "subject_suffix_parsing", "strict",
 708             "Controls the parsing of the [suffix] on subject\n"
 709             "lines in incoming emails. \"strict\" will return an\n"
 710             "error to the sender if the [suffix] is not recognised.\n"
 711             "\"loose\" will attempt to parse the [suffix] but just\n"
 712             "pass it through as part of the issue title if not\n"
 713             "recognised. \"none\" will always pass any [suffix]\n"
 714             "through as part of the issue title."),
 715         (Option, "subject_suffix_delimiters", "[]",
 716             "Defines the brackets used for delimiting the prefix and \n"
 717             'suffix in a subject line. The presence of "suffix" in\n'
 718             "the config option name is a historical artifact and may\n"
 719             "be ignored."),
 720         (Option, "subject_content_match", "always",
 721             "Controls matching of the incoming email subject line\n"
 722             "against issue titles in the case where there is no\n"
 723             "designator [prefix]. \"never\" turns off matching.\n"
 724             "\"creation + interval\" or \"activity + interval\"\n"
 725             "will match an issue for the interval after the issue's\n"
 726             "creation or last activity. The interval is a standard\n"
 727             "Roundup interval."),
 728         (RegExpOption, "refwd_re", "(\s*\W?\s*(fw|fwd|re|aw|sv|ang)\W)+",
 729             "Regular expression matching a single reply or forward\n"
 730             "prefix prepended by the mailer. This is explicitly\n"
 731             "stripped from the subject during parsing."),
 732         (RegExpOption, "origmsg_re",
 733             "^[>|\s]*-----\s?Original Message\s?-----$",
 734             "Regular expression matching start of an original message\n"
 735             "if quoted the in body."),
 736         (RegExpOption, "sign_re", "^[>|\s]*-- ?$",
 737             "Regular expression matching the start of a signature\n"
 738             "in the message body."),
 739         (RegExpOption, "eol_re", r"[\r\n]+",
 740             "Regular expression matching end of line."),
 741         (RegExpOption, "blankline_re", r"[\r\n]+\s*[\r\n]+",
 742             "Regular expression matching a blank line."),
 743         (BooleanOption, "ignore_alternatives", "no",
 744             "When parsing incoming mails, roundup uses the first\n"
 745             "text/plain part it finds. If this part is inside a\n"
 746             "multipart/alternative, and this option is set, all other\n"
 747             "parts of the multipart/alternative are ignored. The default\n"
 748             "is to keep all parts and attach them to the issue."),
 749     ), "Roundup Mail Gateway options"),
 750     ("pgp", (
 751         (BooleanOption, "enable", "no",
 752             "Enable PGP processing. Requires pyme."),
 753         (NullableOption, "roles", "",
 754             "If specified, a comma-separated list of roles to perform\n"
 755             "PGP processing on. If not specified, it happens for all\n"
 756             "users."),
 757         (NullableOption, "homedir", "",
 758             "Location of PGP directory. Defaults to $HOME/.gnupg if\n"
 759             "not specified."),
 760     ), "OpenPGP mail processing options"),
 761     ("nosy", (
 762         (RunDetectorOption, "messages_to_author", "no",
 763             "Send nosy messages to the author of the message.",
 764             ["MESSAGES_TO_AUTHOR"]),
 765         (Option, "signature_position", "bottom",
 766             "Where to place the email signature.\n"
 767             "Allowed values: top, bottom, none",
 768             ["EMAIL_SIGNATURE_POSITION"]),
 769         (RunDetectorOption, "add_author", "new",
 770             "Does the author of a message get placed on the nosy list\n"
 771             "automatically?  If 'new' is used, then the author will\n"
 772             "only be added when a message creates a new issue.\n"
 773             "If 'yes', then the author will be added on followups too.\n"
 774             "If 'no', they're never added to the nosy.\n",
 775             ["ADD_AUTHOR_TO_NOSY"]),
 776         (RunDetectorOption, "add_recipients", "new",
 777             "Do the recipients (To:, Cc:) of a message get placed on the\n"
 778             "nosy list?  If 'new' is used, then the recipients will\n"
 779             "only be added when a message creates a new issue.\n"
 780             "If 'yes', then the recipients will be added on followups too.\n"
 781             "If 'no', they're never added to the nosy.\n",
 782             ["ADD_RECIPIENTS_TO_NOSY"]),
 783         (Option, "email_sending", "single",
 784             "Controls the email sending from the nosy reactor. If\n"
 785             "\"multiple\" then a separate email is sent to each\n"
 786             "recipient. If \"single\" then a single email is sent with\n"
 787             "each recipient as a CC address."),
 788         (IntegerNumberOption, "max_attachment_size", sys.maxint,
 789             "Attachments larger than the given number of bytes\n"
 790             "won't be attached to nosy mails. They will be replaced by\n"
 791             "a link to the tracker's download page for the file.")
 792     ), "Nosy messages sending"),
 793 )
 794
 795 ### Configuration classes
 796
 797 class Config:
 798
 799     """Base class for configuration objects.
 800
 801     Configuration options may be accessed as attributes or items
 802     of instances of this class.  All option names are uppercased.
 803
 804     """
 805
 806     # Config file name
 807     INI_FILE = "config.ini"
 808
 809     # Object attributes that should not be taken as common configuration
 810     # options in __setattr__ (most of them are initialized in constructor):
 811     # builtin pseudo-option - package home directory
 812     HOME = "."
 813     # names of .ini file sections, in order
 814     sections = None
 815     # section comments
 816     section_descriptions = None
 817     # lists of option names for each section, in order
 818     section_options = None
 819     # mapping from option names and aliases to Option instances
 820     options = None
 821     # actual name of the config file.  set on load.
 822     filepath = os.path.join(HOME, INI_FILE)
 823
 824     def __init__(self, config_path=None, layout=None, settings={}):
 825         """Initialize confing instance
 826
 827         Parameters:
 828             config_path:
 829                 optional directory or file name of the config file.
 830                 If passed, load the config after processing layout (if any).
 831                 If config_path is a directory name, use default base name
 832                 of the config file.
 833             layout:
 834                 optional configuration layout, a sequence of
 835                 section definitions suitable for .add_section()
 836             settings:
 837                 optional setting overrides (dictionary).
 838                 The overrides are applied after loading config file.
 839
 840         """
 841         # initialize option containers:
 842         self.sections = []
 843         self.section_descriptions = {}
 844         self.section_options = {}
 845         self.options = {}
 846         # add options from the layout structure
 847         if layout:
 848             for section in layout:
 849                 self.add_section(*section)
 850         if config_path is not None:
 851             self.load(config_path)
 852         for (name, value) in settings.items():
 853             self[name.upper()] = value
 854
 855     def add_section(self, section, options, description=None):
 856         """Define new config section
 857
 858         Parameters:
 859             section - name of the config.ini section
 860             options - a sequence of Option definitions.
 861                 Each Option definition is a sequence
 862                 containing class object and constructor
 863                 parameters, starting from the setting name:
 864                 setting, default, [description, [aliases]]
 865             description - optional section comment
 866
 867         Note: aliases should only exist in historical options
 868         for backwards compatibility - new options should
 869         *not* have aliases!
 870
 871         """
 872         if description or not self.section_descriptions.has_key(section):
 873             self.section_descriptions[section] = description
 874         for option_def in options:
 875             klass = option_def[0]
 876             args = option_def[1:]
 877             option = klass(self, section, *args)
 878             self.add_option(option)
 879
 880     def add_option(self, option):
 881         """Adopt a new Option object"""
 882         _section = option.section
 883         _name = option.setting
 884         if _section not in self.sections:
 885             self.sections.append(_section)
 886         _options = self._get_section_options(_section)
 887         if _name not in _options:
 888             _options.append(_name)
 889         # (section, name) key is used for writing .ini file
 890         self.options[(_section, _name)] = option
 891         # make the option known under all of its A.K.A.s
 892         for _name in option.aliases:
 893             self.options[_name] = option
 894
 895     def update_option(self, name, klass,
 896         default=NODEFAULT, description=None
 897     ):
 898         """Override behaviour of early created option.
 899
 900         Parameters:
 901             name:
 902                 option name
 903             klass:
 904                 one of the Option classes
 905             default:
 906                 optional default value for the option
 907             description:
 908                 optional new description for the option
 909
 910         Conversion from current option value to new class value
 911         is done via string representation.
 912
 913         This method may be used to attach some brains
 914         to options autocreated by UserConfig.
 915
 916         """
 917         # fetch current option
 918         option = self._get_option(name)
 919         # compute constructor parameters
 920         if default is NODEFAULT:
 921             default = option.default
 922         if description is None:
 923             description = option.description
 924         value = option.value2str(current=1)
 925         # resurrect the option
 926         option = klass(self, option.section, option.setting,
 927             default=default, description=description)
 928         # apply the value
 929         option.set(value)
 930         # incorporate new option
 931         del self[name]
 932         self.add_option(option)
 933
 934     def reset(self):
 935         """Set all options to their default values"""
 936         for _option in self.items():
 937             _option.reset()
 938
 939     # Meant for commandline tools.
 940     # Allows automatic creation of configuration files like this:
 941     #  roundup-server -p 8017 -u roundup --save-config
 942     def getopt(self, args, short_options="", long_options=(),
 943         config_load_options=("C", "config"), **options
 944     ):
 945         """Apply options specified in command line arguments.
 946
 947         Parameters:
 948             args:
 949                 command line to parse (sys.argv[1:])
 950             short_options:
 951                 optional string of letters for command line options
 952                 that are not config options
 953             long_options:
 954                 optional list of names for long options
 955                 that are not config options
 956             config_load_options:
 957                 two-element sequence (letter, long_option) defining
 958                 the options for config file.  If unset, don't load
 959                 config file; otherwise config file is read prior
 960                 to applying other options.  Short option letter
 961                 must not have a colon and long_option name must
 962                 not have an equal sign or '--' prefix.
 963             options:
 964                 mapping from option names to command line option specs.
 965                 e.g. server_port="p:", server_user="u:"
 966                 Names are forced to lower case for commandline parsing
 967                 (long options) and to upper case to find config options.
 968                 Command line options accepting no value are assumed
 969                 to be binary and receive value 'yes'.
 970
 971         Return value: same as for python standard getopt(), except that
 972         processed options are removed from returned option list.
 973
 974         """
 975         # take a copy of long_options
 976         long_options = list(long_options)
 977         # build option lists
 978         cfg_names = {}
 979         booleans = []
 980         for (name, letter) in options.items():
 981             cfg_name = name.upper()
 982             short_opt = "-" + letter[0]
 983             name = name.lower().replace("_", "-")
 984             cfg_names.update({short_opt: cfg_name, "--" + name: cfg_name})
 985
 986             short_options += letter
 987             if letter[-1] == ":":
 988                 long_options.append(name + "=")
 989             else:
 990                 booleans.append(short_opt)
 991                 long_options.append(name)
 992
 993         if config_load_options:
 994             short_options += config_load_options[0] + ":"
 995             long_options.append(config_load_options[1] + "=")
 996             # compute names that will be searched in getopt return value
 997             config_load_options = (
 998                 "-" + config_load_options[0],
 999                 "--" + config_load_options[1],
1000             )
1001         # parse command line arguments
1002         optlist, args = getopt.getopt(args, short_options, long_options)
1003         # load config file if requested
1004         if config_load_options:
1005             for option in optlist:
1006                 if option[0] in config_load_options:
1007                     self.load_ini(option[1])
1008                     optlist.remove(option)
1009                     break
1010         # apply options
1011         extra_options = []
1012         for (opt, arg) in optlist:
1013             if (opt in booleans): # and not arg
1014                 arg = "yes"
1015             try:
1016                 name = cfg_names[opt]
1017             except KeyError:
1018                 extra_options.append((opt, arg))
1019             else:
1020                 self[name] = arg
1021         return (extra_options, args)
1022
1023     # option and section locators (used in option access methods)
1024
1025     def _get_option(self, name):
1026         try:
1027             return self.options[name]
1028         except KeyError:
1029             raise InvalidOptionError(name)
1030
1031     def _get_section_options(self, name):
1032         return self.section_options.setdefault(name, [])
1033
1034     def _get_unset_options(self):
1035         """Return options that need manual adjustments
1036
1037         Return value is a dictionary where keys are section
1038         names and values are lists of option names as they
1039         appear in the config file.
1040
1041         """
1042         need_set = {}
1043         for option in self.items():
1044             if not option.isset():
1045                 need_set.setdefault(option.section, []).append(option.setting)
1046         return need_set
1047
1048     def _adjust_options(self, config):
1049         """Load ad-hoc option definitions from ConfigParser instance."""
1050         pass
1051
1052     def _get_name(self):
1053         """Return the service name for config file heading"""
1054         return ""
1055
1056     # file operations
1057
1058     def load_ini(self, config_path, defaults=None):
1059         """Set options from config.ini file in given home_dir
1060
1061         Parameters:
1062             config_path:
1063                 directory or file name of the config file.
1064                 If config_path is a directory name, use default
1065                 base name of the config file
1066             defaults:
1067                 optional dictionary of defaults for ConfigParser
1068
1069         Note: if home_dir does not contain config.ini file,
1070         no error is raised.  Config will be reset to defaults.
1071
1072         """
1073         if os.path.isdir(config_path):
1074             home_dir = config_path
1075             config_path = os.path.join(config_path, self.INI_FILE)
1076         else:
1077             home_dir = os.path.dirname(config_path)
1078         # parse the file
1079         config_defaults = {"HOME": home_dir}
1080         if defaults:
1081             config_defaults.update(defaults)
1082         config = ConfigParser.ConfigParser(config_defaults)
1083         config.read([config_path])
1084         # .ini file loaded ok.
1085         self.HOME = home_dir
1086         self.filepath = config_path
1087         self._adjust_options(config)
1088         # set the options, starting from HOME
1089         self.reset()
1090         for option in self.items():
1091             option.load_ini(config)
1092
1093     def load(self, home_dir):
1094         """Load configuration settings from home_dir"""
1095         self.load_ini(home_dir)
1096
1097     def save(self, ini_file=None):
1098         """Write current configuration to .ini file
1099
1100         'ini_file' argument, if passed, must be valid full path
1101         to the file to write.  If omitted, default file in current
1102         HOME is created.
1103
1104         If the file to write already exists, it is saved with '.bak'
1105         extension.
1106
1107         """
1108         if ini_file is None:
1109             ini_file = self.filepath
1110         _tmp_file = os.path.splitext(ini_file)[0]
1111         _bak_file = _tmp_file + ".bak"
1112         _tmp_file = _tmp_file + ".tmp"
1113         _fp = file(_tmp_file, "wt")
1114         _fp.write("# %s configuration file\n" % self._get_name())
1115         _fp.write("# Autogenerated at %s\n" % time.asctime())
1116         need_set = self._get_unset_options()
1117         if need_set:
1118             _fp.write("\n# WARNING! Following options need adjustments:\n")
1119             for section, options in need_set.items():
1120                 _fp.write("#  [%s]: %s\n" % (section, ", ".join(options)))
1121         for section in self.sections:
1122             comment = self.section_descriptions.get(section, None)
1123             if comment:
1124                 _fp.write("\n# ".join([""] + comment.split("\n")) +"\n")
1125             else:
1126                 # no section comment - just leave a blank line between sections
1127                 _fp.write("\n")
1128             _fp.write("[%s]\n" % section)
1129             for option in self._get_section_options(section):
1130                 _fp.write("\n" + self.options[(section, option)].format())
1131         _fp.close()
1132         if os.access(ini_file, os.F_OK):
1133             if os.access(_bak_file, os.F_OK):
1134                 os.remove(_bak_file)
1135             os.rename(ini_file, _bak_file)
1136         os.rename(_tmp_file, ini_file)
1137
1138     # container emulation
1139
1140     def __len__(self):
1141         return len(self.items())
1142
1143     def __getitem__(self, name):
1144         if name == "HOME":
1145             return self.HOME
1146         else:
1147             return self._get_option(name).get()
1148
1149     def __setitem__(self, name, value):
1150         if name == "HOME":
1151             self.HOME = value
1152         else:
1153             self._get_option(name).set(value)
1154
1155     def __delitem__(self, name):
1156         _option = self._get_option(name)
1157         _section = _option.section
1158         _name = _option.setting
1159         self._get_section_options(_section).remove(_name)
1160         del self.options[(_section, _name)]
1161         for _alias in _option.aliases:
1162             del self.options[_alias]
1163
1164     def items(self):
1165         """Return the list of Option objects, in .ini file order
1166
1167         Note that HOME is not included in this list
1168         because it is builtin pseudo-option, not a real Option
1169         object loaded from or saved to .ini file.
1170
1171         """
1172         return [self.options[(_section, _name)]
1173             for _section in self.sections
1174             for _name in self._get_section_options(_section)
1175         ]
1176
1177     def keys(self):
1178         """Return the list of "canonical" names of the options
1179
1180         Unlike .items(), this list also includes HOME
1181
1182         """
1183         return ["HOME"] + [_option.name for _option in self.items()]
1184
1185     # .values() is not implemented because i am not sure what should be
1186     # the values returned from this method: Option instances or config values?
1187
1188     # attribute emulation
1189
1190     def __setattr__(self, name, value):
1191         if self.__dict__.has_key(name) or hasattr(self.__class__, name):
1192             self.__dict__[name] = value
1193         else:
1194             self._get_option(name).set(value)
1195
1196     # Note: __getattr__ is not symmetric to __setattr__:
1197     #   self.__dict__ lookup is done before calling this method
1198     def __getattr__(self, name):
1199         return self[name]
1200
1201 class UserConfig(Config):
1202
1203     """Configuration for user extensions.
1204
1205     Instances of this class have no predefined configuration layout.
1206     Options are created on the fly for each setting present in the
1207     config file.
1208
1209     """
1210
1211     def _adjust_options(self, config):
1212         # config defaults appear in all sections.
1213         # we'll need to filter them out.
1214         defaults = config.defaults().keys()
1215         # see what options are already defined and add missing ones
1216         preset = [(option.section, option.setting) for option in self.items()]
1217         for section in config.sections():
1218             for name in config.options(section):
1219                 if ((section, name) not in preset) \
1220                 and (name not in defaults):
1221                     self.add_option(Option(self, section, name))
1222
1223 class CoreConfig(Config):
1224
1225     """Roundup instance configuration.
1226
1227     Core config has a predefined layout (see the SETTINGS structure),
1228     supports loading of old-style pythonic configurations and holds
1229     three additional attributes:
1230         logging:
1231             instance logging engine, from standard python logging module
1232             or minimalistic logger implemented in Roundup
1233         detectors:
1234             user-defined configuration for detectors
1235         ext:
1236             user-defined configuration for extensions
1237
1238     """
1239
1240     # module name for old style configuration
1241     PYCONFIG = "config"
1242     # user configs
1243     ext = None
1244     detectors = None
1245
1246     def __init__(self, home_dir=None, settings={}):
1247         Config.__init__(self, home_dir, layout=SETTINGS, settings=settings)
1248         # load the config if home_dir given
1249         if home_dir is None:
1250             self.init_logging()
1251
1252     def copy(self):
1253         new = CoreConfig()
1254         new.sections = list(self.sections)
1255         new.section_descriptions = dict(self.section_descriptions)
1256         new.section_options = dict(self.section_options)
1257         new.options = dict(self.options)
1258         return new
1259
1260     def _get_unset_options(self):
1261         need_set = Config._get_unset_options(self)
1262         # remove MAIL_PASSWORD if MAIL_USER is empty
1263         if "password" in need_set.get("mail", []):
1264             if not self["MAIL_USERNAME"]:
1265                 settings = need_set["mail"]
1266                 settings.remove("password")
1267                 if not settings:
1268                     del need_set["mail"]
1269         return need_set
1270
1271     def _get_name(self):
1272         return self["TRACKER_NAME"]
1273
1274     def reset(self):
1275         Config.reset(self)
1276         if self.ext:
1277             self.ext.reset()
1278         if self.detectors:
1279             self.detectors.reset()
1280         self.init_logging()
1281
1282     def init_logging(self):
1283         _file = self["LOGGING_CONFIG"]
1284         if _file and os.path.isfile(_file):
1285             logging.config.fileConfig(_file)
1286             return
1287
1288         _file = self["LOGGING_FILENAME"]
1289         # set file & level on the root logger
1290         logger = logging.getLogger()
1291         if _file:
1292             hdlr = logging.FileHandler(_file)
1293         else:
1294             hdlr = logging.StreamHandler(sys.stdout)
1295         formatter = logging.Formatter(
1296             '%(asctime)s %(levelname)s %(message)s')
1297         hdlr.setFormatter(formatter)
1298         # no logging API to remove all existing handlers!?!
1299         for h in logger.handlers:
1300             h.close()
1301             logger.removeHandler(hdlr)
1302         logger.handlers = [hdlr]
1303         logger.setLevel(logging._levelNames[self["LOGGING_LEVEL"] or "ERROR"])
1304
1305     def load(self, home_dir):
1306         """Load configuration from path designated by home_dir argument"""
1307         if os.path.isfile(os.path.join(home_dir, self.INI_FILE)):
1308             self.load_ini(home_dir)
1309         else:
1310             self.load_pyconfig(home_dir)
1311         self.init_logging()
1312         self.ext = UserConfig(os.path.join(home_dir, "extensions"))
1313         self.detectors = UserConfig(os.path.join(home_dir, "detectors"))
1314
1315     def load_ini(self, home_dir, defaults=None):
1316         """Set options from config.ini file in given home_dir directory"""
1317         config_defaults = {"TRACKER_HOME": home_dir}
1318         if defaults:
1319             config_defaults.update(defaults)
1320         Config.load_ini(self, home_dir, config_defaults)
1321
1322     def load_pyconfig(self, home_dir):
1323         """Set options from config.py file in given home_dir directory"""
1324         # try to locate and import the module
1325         _mod_fp = None
1326         try:
1327             try:
1328                 _module = imp.find_module(self.PYCONFIG, [home_dir])
1329                 _mod_fp = _module[0]
1330                 _config = imp.load_module(self.PYCONFIG, *_module)
1331             except ImportError:
1332                 raise NoConfigError(home_dir)
1333         finally:
1334             if _mod_fp is not None:
1335                 _mod_fp.close()
1336         # module loaded ok.  set the options, starting from HOME
1337         self.reset()
1338         self.HOME = home_dir
1339         for _option in self.items():
1340             _option.load_pyconfig(_config)
1341         # backward compatibility:
1342         # SMTP login parameters were specified as a tuple in old style configs
1343         # convert them to new plain string options
1344         _mailuser = getattr(_config, "MAILUSER", ())
1345         if len(_mailuser) > 0:
1346             self.MAIL_USERNAME = _mailuser[0]
1347         if len(_mailuser) > 1:
1348             self.MAIL_PASSWORD = _mailuser[1]
1349
1350     # in this config, HOME is also known as TRACKER_HOME
1351     def __getitem__(self, name):
1352         if name == "TRACKER_HOME":
1353             return self.HOME
1354         else:
1355             return Config.__getitem__(self, name)
1356
1357     def __setitem__(self, name, value):
1358         if name == "TRACKER_HOME":
1359             self.HOME = value
1360         else:
1361             self._get_option(name).set(value)
1362
1363     def __setattr__(self, name, value):
1364         if name == "TRACKER_HOME":
1365             self.__dict__["HOME"] = value
1366         else:
1367             Config.__setattr__(self, name, value)
1368
1369 # vim: set et sts=4 sw=4 :