root = (typeof(exports) === "undefined") ? window : exports root.utils = { getCurrentVersion: function() { // Chromium #15242 will make this XHR request to access the manifest unnecessary. var manifestRequest = new XMLHttpRequest(); manifestRequest.open("GET", chrome.extension.getURL("manifest.json"), false); manifestRequest.send(null); return JSON.parse(manifestRequest.responseText).version; }, /* * Takes a dot-notation object string and call the function * that it points to with the correct value for 'this'. */ invokeCommandString: function(str, argArray) { var components = str.split('.'); var obj = window; for (var i = 0; i < components.length - 1; i++) obj = obj[components[i]]; var func = obj[components.pop()]; return func.apply(obj, argArray); }, /* * Takes an array of XPath selectors, adds the necessary namespaces (currently only XHTML), and applies them * to the document root. The namespaceResolver in evaluateXPath should be kept in sync with the namespaces * here. */ makeXPath: function(elementArray) { var xpath = []; for (var i in elementArray) xpath.push("//" + elementArray[i], "//xhtml:" + elementArray[i]); return xpath.join(" | "); }, evaluateXPath: function(xpath, resultType) { function namespaceResolver(namespace) { return namespace == "xhtml" ? "http://www.w3.org/1999/xhtml" : null; } return document.evaluate(xpath, document.documentElement, namespaceResolver, resultType, null); }, /** Sets up prototype inheritance */ extend: function(base, sub) { function surrogateCtor() { } surrogateCtor.prototype = base.prototype; sub.prototype = new surrogateCtor(); sub.prototype.constructor = sub; }, /** Creates a single DOM element from :html */ createElementFromHtml: function(html) { var tmp = document.createElement("div"); tmp.innerHTML = html; return tmp.firstChild; }, escapeHtml: function(string) { return string.replace(//g, ">"); }, /** * Generates a unique ID */ createUniqueId: (function() { id = 0; return function() { return ++id; }; })(), /** * Completes a partial URL (without scheme) */ createFullUrl: function(partialUrl) { if (!/^[a-z]{3,}:\/\//.test(partialUrl)) partialUrl = 'http://' + partialUrl; return partialUrl }, /** * Tries to detect, whether :str is a valid URL. */ isUrl: function(str) { // more or less RFC compliant URL host part parsing. This should be sufficient // for our needs var urlRegex = new RegExp( '^(?:([^:]+)(?::([^:]+))?@)?' + // user:password (optional) => \1, \2 '([^:]+|\\[[^\\]]+\\])' + // host name (IPv6 addresses in square brackets allowed) => \3 '(?::(\\d+))?$' // port number (optional) => \4 ); // these are all official ASCII TLDs that are longer than 3 characters // (including the inofficial .onion TLD used by TOR) var longTlds = [ 'arpa', 'asia', 'coop', 'info', 'jobs', 'local', 'mobi', 'museum', 'name', 'onion' ]; // are there more? var specialHostNames = [ 'localhost' ]; // it starts with a scheme, so it's definitely an URL if (/^[a-z]{3,}:\/\//.test(str)) return true; // spaces => definitely not a valid URL if (str.indexOf(' ') >= 0) return false; // assuming that this is an URL, try to parse it into its meaningful parts. If matching fails, we're // pretty sure that we don't have some kind of URL here. var match = urlRegex.exec(str.split('/')[0]); if (!match) return false; var hostname = match[3]; // allow known special host names if (specialHostNames.indexOf(hostname) >= 0) return true; // allow IPv6 addresses (need to be wrapped in brackets, as required by RFC). It is sufficient to check // for a colon here, as the regex wouldn't match colons in the host name unless it's an v6 address if (hostname.indexOf(':') >= 0) return true; // at this point we have to make a decision. As a heuristic, we check if the input has dots in it. If // yes, and if the last part could be a TLD, treat it as an URL. var dottedParts = hostname.split('.'); var lastPart = dottedParts[dottedParts.length-1]; if (dottedParts.length > 1 && ((lastPart.length >= 2 && lastPart.length <= 3) || longTlds.indexOf(lastPart) >= 0)) return true; // also allow IPv4 addresses if (/^(\d{1,3}\.){3}\d{1,3}$/.test(hostname)) return true; // fallback: no URL return false }, /** * Creates a search URL from the given :query. */ createSearchUrl: function(query) { // we need to escape explictely to encode characters like "+" correctly return "http://www.google.com/search?q=" + encodeURIComponent(query); }, /** * Converts :string into a google search if it's not already a URL. * We don't bother with escaping characters as Chrome will do that for us. */ convertToUrl: function(string) { string = string.trim(); if (utils.isUrl(string)) return utils.createFullUrl(string); else return utils.createSearchUrl(string); } }; /* Execute a function with the given value for "this". Equivalent to jQuery.proxy(). */ Function.prototype.proxy = function(self) { var fn = this; return function() { return fn.apply(self, arguments); }; }; /* * This creates a new function out of an existing function, where the new function takes fewer arguments. * This allows us to pass around functions instead of functions + a partial list of arguments. */ Function.prototype.curry = function() { var fixedArguments = Array.copy(arguments); var fn = this; return function() { return fn.apply(this, fixedArguments.concat(Array.copy(arguments))); }; }; Array.copy = function(array) { return Array.prototype.slice.call(array, 0); }; /* * A very simple method for defining a new class (constructor and methods) using a single hash. * No support for inheritance is included because we really shouldn't need it. */ Class = { extend: function(properties) { var newClass = function() { if (this.init) this.init.apply(this, arguments); }; newClass.prototype = properties; newClass.constructor = newClass; return newClass; } };93'>93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 
from __future__ import unicode_literals

import copy
import datetime
import inspect
import re
import warnings

from django.core import validators
from django.core.exceptions import ValidationError
from django.conf import settings
from django import forms
from django.forms import widgets
from django.utils.encoding import is_protected_type
from django.utils.translation import ugettext_lazy as _

from rest_framework import ISO_8601
from rest_framework.compat import timezone, parse_date, parse_datetime, parse_time
from rest_framework.compat import BytesIO
from rest_framework.compat import six
from rest_framework.compat import smart_text
from rest_framework.settings import api_settings


def is_simple_callable(obj):
    """
    True if the object is a callable that takes no arguments.
    """
    function = inspect.isfunction(obj)
    method = inspect.ismethod(obj)

    if not (function or method):
        return False

    args, _, _, defaults = inspect.getargspec(obj)
    len_args = len(args) if function else len(args) - 1
    len_defaults = len(defaults) if defaults else 0
    return len_args <= len_defaults


def get_component(obj, attr_name):
    """
    Given an object, and an attribute name,
    return that attribute on the object.
    """
    if isinstance(obj, dict):
        val = obj[attr_name]
    else:
        val = getattr(obj, attr_name)

    if is_simple_callable(val):
        return val()
    return val


def readable_datetime_formats(formats):
    format = ', '.join(formats).replace(ISO_8601, 'YYYY-MM-DDThh:mm[:ss[.uuuuuu]][+HHMM|-HHMM|Z]')
    return humanize_strptime(format)


def readable_date_formats(formats):
    format = ', '.join(formats).replace(ISO_8601, 'YYYY[-MM[-DD]]')
    return humanize_strptime(format)


def readable_time_formats(formats):
    format = ', '.join(formats).replace(ISO_8601, 'hh:mm[:ss[.uuuuuu]]')
    return humanize_strptime(format)


def humanize_strptime(format_string):
    # Note that we're missing some of the locale specific mappings that
    # don't really make sense.
    mapping = {
        "%Y": "YYYY",
        "%y": "YY",
        "%m": "MM",
        "%b": "[Jan-Dec]",
        "%B": "[January-December]",
        "%d": "DD",
        "%H": "hh",
        "%I": "hh",  # Requires '%p' to differentiate from '%H'.
        "%M": "mm",
        "%S": "ss",
        "%f": "uuuuuu",
        "%a": "[Mon-Sun]",
        "%A": "[Monday-Sunday]",
        "%p": "[AM|PM]",
        "%z": "[+HHMM|-HHMM]"
    }
    for key, val in mapping.items():
        format_string = format_string.replace(key, val)
    return format_string


class Field(object):
    read_only = True
    creation_counter = 0
    empty = ''
    type_name = None
    partial = False
    use_files = False
    form_field_class = forms.CharField

    def __init__(self, source=None):
        self.parent = None

        self.creation_counter = Field.creation_counter
        Field.creation_counter += 1

        self.source = source

    def initialize(self, parent, field_name):
        """
        Called to set up a field prior to field_to_native or field_from_native.

        parent - The parent serializer.
        model_field - The model field this field corresponds to, if one exists.
        """
        self.parent = parent
        self.root = parent.root or parent
        self.context = self.root.context
        self.partial = self.root.partial
        if self.partial:
            self.required = False

    def field_from_native(self, data, files, field_name, into):
        """
        Given a dictionary and a field name, updates the dictionary `into`,
        with the field and it's deserialized value.
        """
        return

    def field_to_native(self, obj, field_name):
        """
        Given and object and a field name, returns the value that should be
        serialized for that field.
        """
        if obj is None:
            return self.empty

        if self.source == '*':
            return self.to_native(obj)

        source = self.source or field_name
        value = obj

        for component in source.split('.'):
            value = get_component(value, component)
            if value is None:
                break

        return self.to_native(value)

    def to_native(self, value):
        """
        Converts the field's value into it's simple representation.
        """
        if is_simple_callable(value):
            value = value()

        if is_protected_type(value):
            return value
        elif hasattr(value, '__iter__') and not isinstance(value, (dict, six.string_types)):
            return [self.to_native(item) for item in value]
        elif isinstance(value, dict):
            return dict(map(self.to_native, (k, v)) for k, v in value.items())
        return smart_text(value)

    def attributes(self):
        """
        Returns a dictionary of attributes to be used when serializing to xml.
        """
        if self.type_name:
            return {'type': self.type_name}
        return {}


class WritableField(Field):
    """
    Base for read/write fields.
    """
    default_validators = []
    default_error_messages = {
        'required': _('This field is required.'),
        'invalid': _('Invalid value.'),
    }
    widget = widgets.TextInput
    default = None

    def __init__(self, source=None, read_only=False, required=None,
                 validators=[], error_messages=None, widget=None,
                 default=None, blank=None):

        # 'blank' is to be deprecated in favor of 'required'
        if blank is not None:
            warnings.warn('The `blank` keyword argument is due to deprecated. '
                          'Use the `required` keyword argument instead.',
                          PendingDeprecationWarning, stacklevel=2)
            required = not(blank)

        super(WritableField, self).__init__(source=source)

        self.read_only = read_only
        if required is None:
            self.required = not(read_only)
        else:
            assert not (read_only and required), "Cannot set required=True and read_only=True"
            self.required = required

        messages = {}
        for c in reversed(self.__class__.__mro__):
            messages.update(getattr(c, 'default_error_messages', {}))
        messages.update(error_messages or {})
        self.error_messages = messages

        self.validators = self.default_validators + validators
        self.default = default if default is not None else self.default

        # Widgets are ony used for HTML forms.
        widget = widget or self.widget
        if isinstance(widget, type):
            widget = widget()
        self.widget = widget

    def validate(self, value):
        if value in validators.EMPTY_VALUES and self.required:
            raise ValidationError(self.error_messages['required'])

    def run_validators(self, value):
        if value in validators.EMPTY_VALUES:
            return
        errors = []
        for v in self.validators:
            try:
                v(value)
            except ValidationError as e:
                if hasattr(e, 'code') and e.code in self.error_messages:
                    message = self.error_messages[e.code]
                    if e.params:
                        message = message % e.params
                    errors.append(message)
                else:
                    errors.extend(e.messages)
        if errors:
            raise ValidationError(errors)

    def field_from_native(self, data, files, field_name, into):
        """
        Given a dictionary and a field name, updates the dictionary `into`,
        with the field and it's deserialized value.
        """
        if self.read_only:
            return

        try:
            if self.use_files:
                files = files or {}
                native = files[field_name]
            else:
                native = data[field_name]
        except KeyError:
            if self.default is not None and not self.partial:
                # Note: partial updates shouldn't set defaults
                native = self.default
            else:
                if self.required:
                    raise ValidationError(self.error_messages['required'])
                return

        value = self.from_native(native)
        if self.source == '*':
            if value:
                into.update(value)
        else:
            self.validate(value)
            self.run_validators(value)
            into[self.source or field_name] = value

    def from_native(self, value):
        """
        Reverts a simple representation back to the field's value.
        """
        return value


class ModelField(WritableField):
    """
    A generic field that can be used against an arbitrary model field.
    """
    def __init__(self, *args, **kwargs):
        try:
            self.model_field = kwargs.pop('model_field')
        except KeyError:
            raise ValueError("ModelField requires 'model_field' kwarg")

        self.min_length = kwargs.pop('min_length',
                            getattr(self.model_field, 'min_length', None))
        self.max_length = kwargs.pop('max_length',
                            getattr(self.model_field, 'max_length', None))

        super(ModelField, self).__init__(*args, **kwargs)

        if self.min_length is not None:
            self.validators.append(validators.MinLengthValidator(self.min_length))
        if self.max_length is not None:
            self.validators.append(validators.MaxLengthValidator(self.max_length))

    def from_native(self, value):
        rel = getattr(self.model_field, "rel", None)
        if rel is not None:
            return rel.to._meta.get_field(rel.field_name).to_python(value)
        else:
            return self.model_field.to_python(value)

    def field_to_native(self, obj, field_name):
        value = self.model_field._get_val_from_obj(obj)
        if is_protected_type(value):
            return value
        return self.model_field.value_to_string(obj)

    def attributes(self):
        return {
            "type": self.model_field.get_internal_type()
        }


##### Typed Fields #####

class BooleanField(WritableField):
    type_name = 'BooleanField'
    form_field_class = forms.BooleanField
    widget = widgets.CheckboxInput
    default_error_messages = {
        'invalid': _("'%s' value must be either True or False."),
    }
    empty = False

    # Note: we set default to `False` in order to fill in missing value not
    # supplied by html form.  TODO: Fix so that only html form input gets
    # this behavior.
    default = False

    def from_native(self, value):
        if value in ('true', 't', 'True', '1'):
            return True
        if value in ('false', 'f', 'False', '0'):
            return False
        return bool(value)


class CharField(WritableField):
    type_name = 'CharField'
    form_field_class = forms.CharField

    def __init__(self, max_length=None, min_length=None, *args, **kwargs):
        self.max_length, self.min_length = max_length, min_length
        super(CharField, self).__init__(*args, **kwargs)
        if min_length is not None:
            self.validators.append(validators.MinLengthValidator(min_length))
        if max_length is not None:
            self.validators.append(validators.MaxLengthValidator(max_length))

    def from_native(self, value):
        if isinstance(value, six.string_types) or value is None:
            return value
        return smart_text(value)


class URLField(CharField):
    type_name = 'URLField'

    def __init__(self, **kwargs):
        kwargs['max_length'] = kwargs.get('max_length', 200)
        kwargs['validators'] = [validators.URLValidator()]
        super(URLField, self).__init__(**kwargs)


class SlugField(CharField):
    type_name = 'SlugField'

    def __init__(self, *args, **kwargs):
        kwargs['max_length'] = kwargs.get('max_length', 50)
        super(SlugField, self).__init__(*args, **kwargs)


class ChoiceField(WritableField):
    type_name = 'ChoiceField'
    form_field_class = forms.ChoiceField
    widget = widgets.Select
    default_error_messages = {
        'invalid_choice': _('Select a valid choice. %(value)s is not one of '
                            'the available choices.'),
    }

    def __init__(self, choices=(), *args, **kwargs):
        super(ChoiceField, self).__init__(*args, **kwargs)
        self.choices = choices

    def _get_choices(self):
        return self._choices

    def _set_choices(self, value):
        # Setting choices also sets the choices on the widget.
        # choices can be any iterable, but we call list() on it because
        # it will be consumed more than once.
        self._choices = self.widget.choices = list(value)

    choices = property(_get_choices, _set_choices)

    def validate(self, value):
        """
        Validates that the input is in self.choices.
        """
        super(ChoiceField, self).validate(value)
        if value and not self.valid_value(value):
            raise ValidationError(self.error_messages['invalid_choice'] % {'value': value})

    def valid_value(self, value):
        """
        Check to see if the provided value is a valid choice.
        """
        for k, v in self.choices:
            if isinstance(v, (list, tuple)):
                # This is an optgroup, so look inside the group for options
                for k2, v2 in v:
                    if value == smart_text(k2):
                        return True
            else:
                if value == smart_text(k) or value == k:
                    return True
        return False


class EmailField(CharField):
    type_name = 'EmailField'
    form_field_class = forms.EmailField

    default_error_messages = {
        'invalid': _('Enter a valid e-mail address.'),
    }
    default_validators = [validators.validate_email]

    def from_native(self, value):
        ret = super(EmailField, self).from_native(value)
        if ret is None:
            return None
        return ret.strip()

    def __deepcopy__(self, memo):
        result = copy.copy(self)
        memo[id(self)] = result
        #result.widget = copy.deepcopy(self.widget, memo)
        result.validators = self.validators[:]
        return result


class RegexField(CharField):
    type_name = 'RegexField'
    form_field_class = forms.RegexField

    def __init__(self, regex, max_length=None, min_length=None, *args, **kwargs):
        super(RegexField, self).__init__(max_length, min_length, *args, **kwargs)
        self.regex = regex

    def _get_regex(self):
        return self._regex

    def _set_regex(self, regex):
        if isinstance(regex, six.string_types):
            regex = re.compile(regex)
        self._regex = regex
        if hasattr(self, '_regex_validator') and self._regex_validator in self.validators:
            self.validators.remove(self._regex_validator)
        self._regex_validator = validators.RegexValidator(regex=regex)
        self.validators.append(self._regex_validator)

    regex = property(_get_regex, _set_regex)

    def __deepcopy__(self, memo):
        result = copy.copy(self)
        memo[id(self)] = result
        result.validators = self.validators[:]
        return result


class DateField(WritableField):
    type_name = 'DateField'
    widget = widgets.DateInput
    form_field_class = forms.DateField

    default_error_messages = {
        'invalid': _("Date has wrong format. Use one of these formats instead: %s"),
    }
    empty = None
    input_formats = api_settings.DATE_INPUT_FORMATS
    format = None

    def __init__(self, input_formats=None, format=None, *args, **kwargs):
        self.input_formats = input_formats if input_formats is not None else self.input_formats
        self.format = format if format is not None else self.format
        super(DateField, self).__init__(*args, **kwargs)

    def from_native(self, value):
        if value in validators.EMPTY_VALUES:
            return None

        if isinstance(value, datetime.datetime):
            if timezone and settings.USE_TZ and timezone.is_aware(value):
                # Convert aware datetimes to the default time zone
                # before casting them to dates (#17742).
                default_timezone = timezone.get_default_timezone()
                value = timezone.make_naive(value, default_timezone)
            return value.date()
        if isinstance(value, datetime.date):
            return value

        for format in self.input_formats:
            if format.lower() == ISO_8601:
                try:
                    parsed = parse_date(value)
                except (ValueError, TypeError):
                    pass
                else:
                    if parsed is not None:
                        return parsed
            else:
                try:
                    parsed = datetime.datetime.strptime(value, format)
                except (ValueError, TypeError):
                    pass
                else:
                    return parsed.date()

        msg = self.error_messages['invalid'] % readable_date_formats(self.input_formats)
        raise ValidationError(msg)

    def to_native(self, value):
        if value is None or self.format is None:
            return value

        if isinstance(value, datetime.datetime):
            value = value.date()

        if self.format.lower() == ISO_8601:
            return value.isoformat()
        return value.strftime(self.format)


class DateTimeField(WritableField):
    type_name = 'DateTimeField'
    widget = widgets.DateTimeInput
    form_field_class = forms.DateTimeField

    default_error_messages = {
        'invalid': _("Datetime has wrong format. Use one of these formats instead: %s"),
    }
    empty = None
    input_formats = api_settings.DATETIME_INPUT_FORMATS
    format = None

    def __init__(self, input_formats=None, format=None, *args, **kwargs):
        self.input_formats = input_formats if input_formats is not None else self.input_formats
        self.format = format if format is not None else self.format
        super(DateTimeField, self).__init__(*args, **kwargs)

    def from_native(self, value):
        if value in validators.EMPTY_VALUES:
            return None

        if isinstance(value, datetime.datetime):
            return value
        if isinstance(value, datetime.date):
            value = datetime.datetime(value.year, value.month, value.day)
            if settings.USE_TZ:
                # For backwards compatibility, interpret naive datetimes in
                # local time. This won't work during DST change, but we can't
                # do much about it, so we let the exceptions percolate up the
                # call stack.
                warnings.warn("DateTimeField received a naive datetime (%s)"
                              " while time zone support is active." % value,
                              RuntimeWarning)
                default_timezone = timezone.get_default_timezone()
                value = timezone.make_aware(value, default_timezone)
            return value

        for format in self.input_formats:
            if format.lower() == ISO_8601:
                try:
                    parsed = parse_datetime(value)
                except (ValueError, TypeError):
                    pass
                else:
                    if parsed is not None:
                        return parsed
            else:
                try:
                    parsed = datetime.datetime.strptime(value, format)
                except (ValueError, TypeError):
                    pass
                else:
                    return parsed

        msg = self.error_messages['invalid'] % readable_datetime_formats(self.input_formats)
        raise ValidationError(msg)

    def to_native(self, value):
        if value is None or self.format is None:
            return value

        if self.format.lower() == ISO_8601:
            ret = value.isoformat()
            if ret.endswith('+00:00'):
                ret = ret[:-6] + 'Z'
            return ret
        return value.strftime(self.format)


class TimeField(WritableField):
    type_name = 'TimeField'
    widget = widgets.TimeInput
    form_field_class = forms.TimeField

    default_error_messages = {
        'invalid': _("Time has wrong format. Use one of these formats instead: %s"),
    }
    empty = None
    input_formats = api_settings.TIME_INPUT_FORMATS
    format = None

    def __init__(self, input_formats=None, format=None, *args, **kwargs):
        self.input_formats = input_formats if input_formats is not None else self.input_formats
        self.format = format if format is not None else self.format
        super(TimeField, self).__init__(*args, **kwargs)

    def from_native(self, value):
        if value in validators.EMPTY_VALUES:
            return None

        if isinstance(value, datetime.time):
            return value

        for format in self.input_formats:
            if format.lower() == ISO_8601:
                try:
                    parsed = parse_time(value)
                except (ValueError, TypeError):
                    pass
                else:
                    if parsed is not None:
                        return parsed
            else:
                try:
                    parsed = datetime.datetime.strptime(value, format)
                except (ValueError, TypeError):
                    pass
                else:
                    return parsed.time()

        msg = self.error_messages['invalid'] % readable_time_formats(self.input_formats)
        raise ValidationError(msg)

    def to_native(self, value):
        if value is None or self.format is None:
            return value

        if isinstance(value, datetime.datetime):
            value = value.time()

        if self.format.lower() == ISO_8601:
            return value.isoformat()
        return value.strftime(self.format)


class IntegerField(WritableField):
    type_name = 'IntegerField'
    form_field_class = forms.IntegerField

    default_error_messages = {
        'invalid': _('Enter a whole number.'),
        'max_value': _('Ensure this value is less than or equal to %(limit_value)s.'),
        'min_value': _('Ensure this value is greater than or equal to %(limit_value)s.'),
    }

    def __init__(self, max_value=None, min_value=None, *args, **kwargs):
        self.max_value, self.min_value = max_value, min_value
        super(IntegerField, self).__init__(*args, **kwargs)

        if max_value is not None:
            self.validators.append(validators.MaxValueValidator(max_value))
        if min_value is not None:
            self.validators.append(validators.MinValueValidator(min_value))

    def from_native(self, value):
        if value in validators.EMPTY_VALUES:
            return None

        try:
            value = int(str(value))
        except (ValueError, TypeError):
            raise ValidationError(self.error_messages['invalid'])
        return value


class FloatField(WritableField):
    type_name = 'FloatField'
    form_field_class = forms.FloatField

    default_error_messages = {
        'invalid': _("'%s' value must be a float."),
    }

    def from_native(self, value):
        if value in validators.EMPTY_VALUES:
            return None

        try:
            return float(value)
        except (TypeError, ValueError):
            msg = self.error_messages['invalid'] % value
            raise ValidationError(msg)


class FileField(WritableField):
    use_files = True
    type_name = 'FileField'
    form_field_class = forms.FileField
    widget = widgets.FileInput

    default_error_messages = {
        'invalid': _("No file was submitted. Check the encoding type on the form."),
        'missing': _("No file was submitted."),
        'empty': _("The submitted file is empty."),
        'max_length': _('Ensure this filename has at most %(max)d characters (it has %(length)d).'),
        'contradiction': _('Please either submit a file or check the clear checkbox, not both.')
    }

    def __init__(self, *args, **kwargs):
        self.max_length = kwargs.pop('max_length', None)
        self.allow_empty_file = kwargs.pop('allow_empty_file', False)
        super(FileField, self).__init__(*args, **kwargs)

    def from_native(self, data):
        if data in validators.EMPTY_VALUES:
            return None

        # UploadedFile objects should have name and size attributes.
        try:
            file_name = data.name
            file_size = data.size
        except AttributeError:
            raise ValidationError(self.error_messages['invalid'])

        if self.max_length is not None and len(file_name) > self.max_length:
            error_values = {'max': self.max_length, 'length': len(file_name)}
            raise ValidationError(self.error_messages['max_length'] % error_values)
        if not file_name:
            raise ValidationError(self.error_messages['invalid'])
        if not self.allow_empty_file and not file_size:
            raise ValidationError(self.error_messages['empty'])

        return data

    def to_native(self, value):
        return value.name


class ImageField(FileField):
    use_files = True
    form_field_class = forms.ImageField

    default_error_messages = {
        'invalid_image': _("Upload a valid image. The file you uploaded was "
                           "either not an image or a corrupted image."),
    }

    def from_native(self, data):
        """
        Checks that the file-upload field data contains a valid image (GIF, JPG,
        PNG, possibly others -- whatever the Python Imaging Library supports).
        """
        f = super(ImageField, self).from_native(data)
        if f is None:
            return None

        from compat import Image
        assert Image is not None, 'PIL must be installed for ImageField support'

        # We need to get a file object for PIL. We might have a path or we might
        # have to read the data into memory.
        if hasattr(data, 'temporary_file_path'):
            file = data.temporary_file_path()
        else:
            if hasattr(data, 'read'):
                file = BytesIO(data.read())
            else:
                file = BytesIO(data['content'])

        try:
            # load() could spot a truncated JPEG, but it loads the entire
            # image in memory, which is a DoS vector. See #3848 and #18520.
            # verify() must be called immediately after the constructor.
            Image.open(file).verify()
        except ImportError:
            # Under PyPy, it is possible to import PIL. However, the underlying
            # _imaging C module isn't available, so an ImportError will be
            # raised. Catch and re-raise.
            raise
        except Exception:  # Python Imaging Library doesn't recognize it as an image
            raise ValidationError(self.error_messages['invalid_image'])
        if hasattr(f, 'seek') and callable(f.seek):
            f.seek(0)
        return f


class SerializerMethodField(Field):
    """
    A field that gets its value by calling a method on the serializer it's attached to.
    """

    def __init__(self, method_name):
        self.method_name = method_name
        super(SerializerMethodField, self).__init__()

    def field_to_native(self, obj, field_name):
        value = getattr(self.parent, self.method_name)(obj)
        return self.to_native(value)
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 23:34:23 +0000