debug.py

from __future__ import unicode_literals

import re
import sys
import types

from django.conf import settings
from django.core.urlresolvers import Resolver404, resolve
from django.http import HttpResponse, HttpResponseNotFound
from django.template import Context, Engine, TemplateDoesNotExist
from django.template.defaultfilters import force_escape, pprint
from django.utils import lru_cache, six, timezone
from django.utils.datastructures import MultiValueDict
from django.utils.encoding import force_bytes, smart_text
from django.utils.module_loading import import_string
from django.utils.translation import ugettext as _

# Minimal Django templates engine to render the error templates
# regardless of the project's TEMPLATES setting.
DEBUG_ENGINE = Engine(debug=True)

HIDDEN_SETTINGS = re.compile('API|TOKEN|KEY|SECRET|PASS|SIGNATURE')

CLEANSED_SUBSTITUTE = '********************'


def linebreak_iter(template_source):
    yield 0
    p = template_source.find('\n')
    while p >= 0:
        yield p + 1
        p = template_source.find('\n', p + 1)
    yield len(template_source) + 1


class CallableSettingWrapper(object):
    """ Object to wrap callable appearing in settings

    * Not to call in the debug page (#21345).
    * Not to break the debug page if the callable forbidding to set attributes (#23070).
    """
    def __init__(self, callable_setting):
        self._wrapped = callable_setting

    def __repr__(self):
        return repr(self._wrapped)


def cleanse_setting(key, value):
    """Cleanse an individual setting key/value of sensitive content.

    If the value is a dictionary, recursively cleanse the keys in
    that dictionary.
    """
    try:
        if HIDDEN_SETTINGS.search(key):
            cleansed = CLEANSED_SUBSTITUTE
        else:
            if isinstance(value, dict):
                cleansed = {k: cleanse_setting(k, v) for k, v in value.items()}
            else:
                cleansed = value
    except TypeError:
        # If the key isn't regex-able, just return as-is.
        cleansed = value

    if callable(cleansed):
        # For fixing #21345 and #23070
        cleansed = CallableSettingWrapper(cleansed)

    return cleansed


def get_safe_settings():
    "Returns a dictionary of the settings module, with sensitive settings blurred out."
    settings_dict = {}
    for k in dir(settings):
        if k.isupper():
            settings_dict[k] = cleanse_setting(k, getattr(settings, k))
    return settings_dict


def technical_500_response(request, exc_type, exc_value, tb, status_code=500):
    """
    Create a technical server error response. The last three arguments are
    the values returned from sys.exc_info() and friends.
    """
    reporter = ExceptionReporter(request, exc_type, exc_value, tb)
    if request.is_ajax():
        text = reporter.get_traceback_text()
        return HttpResponse(text, status=status_code, content_type='text/plain')
    else:
        html = reporter.get_traceback_html()
        return HttpResponse(html, status=status_code, content_type='text/html')


@lru_cache.lru_cache()
def get_default_exception_reporter_filter():
    # Instantiate the default filter for the first time and cache it.
    return import_string(settings.DEFAULT_EXCEPTION_REPORTER_FILTER)()


def get_exception_reporter_filter(request):
    default_filter = get_default_exception_reporter_filter()
    return getattr(request, 'exception_reporter_filter', default_filter)


class ExceptionReporterFilter(object):
    """
    Base for all exception reporter filter classes. All overridable hooks
    contain lenient default behaviors.
    """

    def get_post_parameters(self, request):
        if request is None:
            return {}
        else:
            return request.POST

    def get_traceback_frame_variables(self, request, tb_frame):
        return list(tb_frame.f_locals.items())


class SafeExceptionReporterFilter(ExceptionReporterFilter):
    """
    Use annotations made by the sensitive_post_parameters and
    sensitive_variables decorators to filter out sensitive information.
    """

    def is_active(self, request):
        """
        This filter is to add safety in production environments (i.e. DEBUG
        is False). If DEBUG is True then your site is not safe anyway.
        This hook is provided as a convenience to easily activate or
        deactivate the filter on a per request basis.
        """
        return settings.DEBUG is False

    def get_cleansed_multivaluedict(self, request, multivaluedict):
        """
        Replaces the keys in a MultiValueDict marked as sensitive with stars.
        This mitigates leaking sensitive POST parameters if something like
        request.POST['nonexistent_key'] throws an exception (#21098).
        """
        sensitive_post_parameters = getattr(request, 'sensitive_post_parameters', [])
        if self.is_active(request) and sensitive_post_parameters:
            multivaluedict = multivaluedict.copy()
            for param in sensitive_post_parameters:
                if param in multivaluedict:
                    multivaluedict[param] = CLEANSED_SUBSTITUTE
        return multivaluedict

    def get_post_parameters(self, request):
        """
        Replaces the values of POST parameters marked as sensitive with
        stars (*********).
        """
        if request is None:
            return {}
        else:
            sensitive_post_parameters = getattr(request, 'sensitive_post_parameters', [])
            if self.is_active(request) and sensitive_post_parameters:
                cleansed = request.POST.copy()
                if sensitive_post_parameters == '__ALL__':
                    # Cleanse all parameters.
                    for k, v in cleansed.items():
                        cleansed[k] = CLEANSED_SUBSTITUTE
                    return cleansed
                else:
                    # Cleanse only the specified parameters.
                    for param in sensitive_post_parameters:
                        if param in cleansed:
                            cleansed[param] = CLEANSED_SUBSTITUTE
                    return cleansed
            else:
                return request.POST

    def cleanse_special_types(self, request, value):
        try:
            # If value is lazy or a complex object of another kind, this check
            # might raise an exception. isinstance checks that lazy
            # MultiValueDicts will have a return value.
            is_multivalue_dict = isinstance(value, MultiValueDict)
        except Exception as e:
            return '{!r} while evaluating {!r}'.format(e, value)

        if is_multivalue_dict:
            # Cleanse MultiValueDicts (request.POST is the one we usually care about)
            value = self.get_cleansed_multivaluedict(request, value)
        return value

    def get_traceback_frame_variables(self, request, tb_frame):
        """
        Replaces the values of variables marked as sensitive with
        stars (*********).
        """
        # Loop through the frame's callers to see if the sensitive_variables
        # decorator was used.
        current_frame = tb_frame.f_back
        sensitive_variables = None
        while current_frame is not None:
            if (current_frame.f_code.co_name == 'sensitive_variables_wrapper'
                    and 'sensitive_variables_wrapper' in current_frame.f_locals):
                # The sensitive_variables decorator was used, so we take note
                # of the sensitive variables' names.
                wrapper = current_frame.f_locals['sensitive_variables_wrapper']
                sensitive_variables = getattr(wrapper, 'sensitive_variables', None)
                break
            current_frame = current_frame.f_back

        cleansed = {}
        if self.is_active(request) and sensitive_variables:
            if sensitive_variables == '__ALL__':
                # Cleanse all variables
                for name, value in tb_frame.f_locals.items():
                    cleansed[name] = CLEANSED_SUBSTITUTE
            else:
                # Cleanse specified variables
                for name, value in tb_frame.f_locals.items():
                    if name in sensitive_variables:
                        value = CLEANSED_SUBSTITUTE
                    else:
                        value = self.cleanse_special_types(request, value)
                    cleansed[name] = value
        else:
            # Potentially cleanse the request and any MultiValueDicts if they
            # are one of the frame variables.
            for name, value in tb_frame.f_locals.items():
                cleansed[name] = self.cleanse_special_types(request, value)

        if (tb_frame.f_code.co_name == 'sensitive_variables_wrapper'
                and 'sensitive_variables_wrapper' in tb_frame.f_locals):
            # For good measure, obfuscate the decorated function's arguments in
            # the sensitive_variables decorator's frame, in case the variables
            # associated with those arguments were meant to be obfuscated from
            # the decorated function's frame.
            cleansed['func_args'] = CLEANSED_SUBSTITUTE
            cleansed['func_kwargs'] = CLEANSED_SUBSTITUTE

        return cleansed.items()


class ExceptionReporter(object):
    """
    A class to organize and coordinate reporting on exceptions.
    """
    def __init__(self, request, exc_type, exc_value, tb, is_email=False):
        self.request = request
        self.filter = get_exception_reporter_filter(self.request)
        self.exc_type = exc_type
        self.exc_value = exc_value
        self.tb = tb
        self.is_email = is_email

        self.template_info = getattr(self.exc_value, 'template_debug', None)
        self.template_does_not_exist = False
        self.postmortem = None

        # Handle deprecated string exceptions
        if isinstance(self.exc_type, six.string_types):
            self.exc_value = Exception('Deprecated String Exception: %r' % self.exc_type)
            self.exc_type = type(self.exc_value)

    def get_traceback_data(self):
        """Return a dictionary containing traceback information."""
        if self.exc_type and issubclass(self.exc_type, TemplateDoesNotExist):
            self.template_does_not_exist = True
            self.postmortem = self.exc_value.chain or [self.exc_value]

        frames = self.get_traceback_frames()
        for i, frame in enumerate(frames):
            if 'vars' in frame:
                frame_vars = []
                for k, v in frame['vars']:
                    v = pprint(v)
                    # The force_escape filter assume unicode, make sure that works
                    if isinstance(v, six.binary_type):
                        v = v.decode('utf-8', 'replace')  # don't choke on non-utf-8 input
                    # Trim large blobs of data
                    if len(v) > 4096:
                        v = '%s... <trimmed %d bytes string>' % (v[0:4096], len(v))
                    frame_vars.append((k, force_escape(v)))
                frame['vars'] = frame_vars
            frames[i] = frame

        unicode_hint = ''
        if self.exc_type and issubclass(self.exc_type, UnicodeError):
            start = getattr(self.exc_value, 'start', None)
            end = getattr(self.exc_value, 'end', None)
            if start is not None and end is not None:
                unicode_str = self.exc_value.args[1]
                unicode_hint = smart_text(
                    unicode_str[max(start - 5, 0):min(end + 5, len(unicode_str))],
                    'ascii', errors='replace'
                )
        from django import get_version
        c = {
            'is_email': self.is_email,
            'unicode_hint': unicode_hint,
            'frames': frames,
            'request': self.request,
            'filtered_POST': self.filter.get_post_parameters(self.request),
            'settings': get_safe_settings(),
            'sys_executable': sys.executable,
            'sys_version_info': '%d.%d.%d' % sys.version_info[0:3],
            'server_time': timezone.now(),
            'django_version_info': get_version(),
            'sys_path': sys.path,
            'template_info': self.template_info,
            'template_does_not_exist': self.template_does_not_exist,
            'postmortem': self.postmortem,
        }
        # Check whether exception info is available
        if self.exc_type:
            c['exception_type'] = self.exc_type.__name__
        if self.exc_value:
            c['exception_value'] = smart_text(self.exc_value, errors='replace')
        if frames:
            c['lastframe'] = frames[-1]
        return c

    def get_traceback_html(self):
        "Return HTML version of debug 500 HTTP error page."
        t = DEBUG_ENGINE.from_string(TECHNICAL_500_TEMPLATE)
        c = Context(self.get_traceback_data(), use_l10n=False)
        return t.render(c)

    def get_traceback_text(self):
        "Return plain text version of debug 500 HTTP error page."
        t = DEBUG_ENGINE.from_string(TECHNICAL_500_TEXT_TEMPLATE)
        c = Context(self.get_traceback_data(), autoescape=False, use_l10n=False)
        return t.render(c)

    def _get_lines_from_file(self, filename, lineno, context_lines, loader=None, module_name=None):
        """
        Returns context_lines before and after lineno from file.
        Returns (pre_context_lineno, pre_context, context_line, post_context).
        """
        source = None
        if loader is not None and hasattr(loader, "get_source"):
            try:
                source = loader.get_source(module_name)
            except ImportError:
                pass
            if source is not None:
                source = source.splitlines()
        if source is None:
            try:
                with open(filename, 'rb') as fp:
                    source = fp.read().splitlines()
            except (OSError, IOError):
                pass
        if source is None:
            return None, [], None, []

        # If we just read the source from a file, or if the loader did not
        # apply tokenize.detect_encoding to decode the source into a Unicode
        # string, then we should do that ourselves.
        if isinstance(source[0], six.binary_type):
            encoding = 'ascii'
            for line in source[:2]:
                # File coding may be specified. Match pattern from PEP-263
                # (http://www.python.org/dev/peps/pep-0263/)
                match = re.search(br'coding[:=]\s*([-\w.]+)', line)
                if match:
                    encoding = match.group(1).decode('ascii')
                    break
            source = [six.text_type(sline, encoding, 'replace') for sline in source]

        lower_bound = max(0, lineno - context_lines)
        upper_bound = lineno + context_lines

        pre_context = source[lower_bound:lineno]
        context_line = source[lineno]
        post_context = source[lineno + 1:upper_bound]

        return lower_bound, pre_context, context_line, post_context

    def get_traceback_frames(self):
        def explicit_or_implicit_cause(exc_value):
            explicit = getattr(exc_value, '__cause__', None)
            implicit = getattr(exc_value, '__context__', None)
            return explicit or implicit

        # Get the exception and all its causes
        exceptions = []
        exc_value = self.exc_value
        while exc_value:
            exceptions.append(exc_value)
            exc_value = explicit_or_implicit_cause(exc_value)

        frames = []
        # No exceptions were supplied to ExceptionReporter
        if not exceptions:
            return frames

        # In case there's just one exception (always in Python 2,
        # sometimes in Python 3), take the traceback from self.tb (Python 2
        # doesn't have a __traceback__ attribute on Exception)
        exc_value = exceptions.pop()
        tb = self.tb if six.PY2 or not exceptions else exc_value.__traceback__

        while tb is not None:
            # Support for __traceback_hide__ which is used by a few libraries
            # to hide internal frames.
            if tb.tb_frame.f_locals.get('__traceback_hide__'):
                tb = tb.tb_next
                continue
            filename = tb.tb_frame.f_code.co_filename
            function = tb.tb_frame.f_code.co_name
            lineno = tb.tb_lineno - 1
            loader = tb.tb_frame.f_globals.get('__loader__')
            module_name = tb.tb_frame.f_globals.get('__name__') or ''
            pre_context_lineno, pre_context, context_line, post_context = self._get_lines_from_file(
                filename, lineno, 7, loader, module_name,
            )
            if pre_context_lineno is not None:
                frames.append({
                    'exc_cause': explicit_or_implicit_cause(exc_value),
                    'exc_cause_explicit': getattr(exc_value, '__cause__', True),
                    'tb': tb,
                    'type': 'django' if module_name.startswith('django.') else 'user',
                    'filename': filename,
                    'function': function,
                    'lineno': lineno + 1,
                    'vars': self.filter.get_traceback_frame_variables(self.request, tb.tb_frame),
                    'id': id(tb),
                    'pre_context': pre_context,
                    'context_line': context_line,
                    'post_context': post_context,
                    'pre_context_lineno': pre_context_lineno + 1,
                })

            # If the traceback for current exception is consumed, try the
            # other exception.
            if six.PY2:
                tb = tb.tb_next
            elif not tb.tb_next and exceptions:
                exc_value = exceptions.pop()
                tb = exc_value.__traceback__
            else:
                tb = tb.tb_next

        return frames

    def format_exception(self):
        """
        Return the same data as from traceback.format_exception.
        """
        import traceback
        frames = self.get_traceback_frames()
        tb = [(f['filename'], f['lineno'], f['function'], f['context_line']) for f in frames]
        list = ['Traceback (most recent call last):\n']
        list += traceback.format_list(tb)
        list += traceback.format_exception_only(self.exc_type, self.exc_value)
        return list


def technical_404_response(request, exception):
    "Create a technical 404 error response. The exception should be the Http404."
    try:
        error_url = exception.args[0]['path']
    except (IndexError, TypeError, KeyError):
        error_url = request.path_info[1:]  # Trim leading slash

    try:
        tried = exception.args[0]['tried']
    except (IndexError, TypeError, KeyError):
        tried = []
    else:
        if (not tried                           # empty URLconf
            or (request.path == '/'
                and len(tried) == 1             # default URLconf
                and len(tried[0]) == 1
                and getattr(tried[0][0], 'app_name', '') == getattr(tried[0][0], 'namespace', '') == 'admin')):
            return default_urlconf(request)

    urlconf = getattr(request, 'urlconf', settings.ROOT_URLCONF)
    if isinstance(urlconf, types.ModuleType):
        urlconf = urlconf.__name__

    caller = ''
    try:
        resolver_match = resolve(request.path)
    except Resolver404:
        pass
    else:
        obj = resolver_match.func

        if hasattr(obj, '__name__'):
            caller = obj.__name__
        elif hasattr(obj, '__class__') and hasattr(obj.__class__, '__name__'):
            caller = obj.__class__.__name__

        if hasattr(obj, '__module__'):
            module = obj.__module__
            caller = '%s.%s' % (module, caller)

    t = DEBUG_ENGINE.from_string(TECHNICAL_404_TEMPLATE)
    c = Context({
        'urlconf': urlconf,
        'root_urlconf': settings.ROOT_URLCONF,
        'request_path': error_url,
        'urlpatterns': tried,
        'reason': force_bytes(exception, errors='replace'),
        'request': request,
        'settings': get_safe_settings(),
        'raising_view_name': caller,
    })
    return HttpResponseNotFound(t.render(c), content_type='text/html')


def default_urlconf(request):
    "Create an empty URLconf 404 error response."
    t = DEBUG_ENGINE.from_string(DEFAULT_URLCONF_TEMPLATE)
    c = Context({
        "title": _("Welcome to Django"),
        "heading": _("It worked!"),
        "subheading": _("Congratulations on your first Django-powered page."),
        "instructions": _("Of course, you haven't actually done any work yet. "
            "Next, start your first app by running <code>python manage.py startapp [app_label]</code>."),
        "explanation": _("You're seeing this message because you have <code>DEBUG = True</code> in your "
            "Django settings file and you haven't configured any URLs. Get to work!"),
    })

    return HttpResponse(t.render(c), content_type='text/html')

#
# Templates are embedded in the file so that we know the error handler will
# always work even if the template loader is broken.
#

TECHNICAL_500_TEMPLATE = ("""
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  <meta name="robots" content="NONE,NOARCHIVE">
  <title>{% if exception_type %}{{ exception_type }}{% else %}Report{% endif %}"""
"""{% if request %} at {{ request.path_info|escape }}{% endif %}</title>
  <style type="text/css">
    html * { padding:0; margin:0; }
    body * { padding:10px 20px; }
    body * * { padding:0; }
    body { font:small sans-serif; }
    body>div { border-bottom:1px solid #ddd; }
    h1 { font-weight:normal; }
    h2 { margin-bottom:.8em; }
    h2 span { font-size:80%; color:#666; font-weight:normal; }
    h3 { margin:1em 0 .5em 0; }
    h4 { margin:0 0 .5em 0; font-weight: normal; }
    code, pre { font-size: 100%; white-space: pre-wrap; }
    table { border:1px solid #ccc; border-collapse: collapse; width:100%; background:white; }
    tbody td, tbody th { vertical-align:top; padding:2px 3px; }
    thead th {
      padding:1px 6px 1px 3px; background:#fefefe; text-align:left;
      font-weight:normal; font-size:11px; border:1px solid #ddd;
    }
    tbody th { width:12em; text-align:right; color:#666; padding-right:.5em; }
    table.vars { margin:5px 0 2px 40px; }
    table.vars td, table.req td { font-family:monospace; }
    table td.code { width:100%; }
    table td.code pre { overflow:hidden; }
    table.source th { color:#666; }
    table.source td { font-family:monospace; white-space:pre; border-bottom:1px solid #eee; }
    ul.traceback { list-style-type:none; color: #222; }
    ul.traceback li.frame { padding-bottom:1em; color:#666; }
    ul.traceback li.user { background-color:#e0e0e0; color:#000 }
    div.context { padding:10px 0; overflow:hidden; }
    div.context ol { padding-left:30px; margin:0 10px; list-style-position: inside; }
    div.context ol li { font-family:monospace; white-space:pre; color:#777; cursor:pointer; padding-left: 2px; }
    div.context ol li pre { display:inline; }
    div.context ol.context-line li { color:#505050; background-color:#dfdfdf; padding: 3px 2px; }
    div.context ol.context-line li span { position:absolute; right:32px; }
    .user div.context ol.context-line li { background-color:#bbb; color:#000; }
    .user div.context ol li { color:#666; }
    div.commands { margin-left: 40px; }
    div.commands a { color:#555; text-decoration:none; }
    .user div.commands a { color: black; }
    #summary { background: #ffc; }
    #summary h2 { font-weight: normal; color: #666; }
    #explanation { background:#eee; }
    #template, #template-not-exist { background:#f6f6f6; }
    #template-not-exist ul { margin: 0 0 10px 20px; }
    #template-not-exist .postmortem-section { margin-bottom: 3px; }
    #unicode-hint { background:#eee; }
    #traceback { background:#eee; }
    #requestinfo { background:#f6f6f6; padding-left:120px; }
    #summary table { border:none; background:transparent; }
    #requestinfo h2, #requestinfo h3 { position:relative; margin-left:-100px; }
    #requestinfo h3 { margin-bottom:-1em; }
    .error { background: #ffc; }
    .specific { color:#cc3300; font-weight:bold; }
    h2 span.commands { font-size:.7em;}
    span.commands a:link {color:#5E5694;}
    pre.exception_value { font-family: sans-serif; color: #666; font-size: 1.5em; margin: 10px 0 10px 0; }
    .append-bottom { margin-bottom: 10px; }
  </style>
  {% if not is_email %}
  <script type="text/javascript">
  //<!--
    function getElementsByClassName(oElm, strTagName, strClassName){
        // Written by Jonathan Snook, http://www.snook.ca/jon; Add-ons by Robert Nyman, http://www.robertnyman.com
        var arrElements = (strTagName == "*" && document.all)? document.all :
        oElm.getElementsByTagName(strTagName);
        var arrReturnElements = new Array();
        strClassName = strClassName.replace(/\-/g, "\\-");
        var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
        var oElement;
        for(var i=0; i<arrElements.length; i++){
            oElement = arrElements[i];
            if(oRegExp.test(oElement.className)){
                arrReturnElements.push(oElement);
            }
        }
        return (arrReturnElements)
    }
    function hideAll(elems) {
      for (var e = 0; e < elems.length; e++) {
        elems[e].style.display = 'none';
      }
    }
    window.onload = function() {
      hideAll(getElementsByClassName(document, 'table', 'vars'));
      hideAll(getElementsByClassName(document, 'ol', 'pre-context'));
      hideAll(getElementsByClassName(document, 'ol', 'post-context'));
      hideAll(getElementsByClassName(document, 'div', 'pastebin'));
    }
    function toggle() {
      for (var i = 0; i < arguments.length; i++) {
        var e = document.getElementById(arguments[i]);
        if (e) {
          e.style.display = e.style.display == 'none' ? 'block': 'none';
        }
      }
      return false;
    }
    function varToggle(link, id) {
      toggle('v' + id);
      var s = link.getElementsByTagName('span')[0];
      var uarr = String.fromCharCode(0x25b6);
      var darr = String.fromCharCode(0x25bc);
      s.innerHTML = s.innerHTML == uarr ? darr : uarr;
      return false;
    }
    function switchPastebinFriendly(link) {
      s1 = "Switch to copy-and-paste view";
      s2 = "Switch back to interactive view";
      link.innerHTML = link.innerHTML.trim() == s1 ? s2: s1;
      toggle('browserTraceback', 'pastebinTraceback');
      return false;
    }
    //-->
  </script>
  {% endif %}
</head>
<body>
<div id="summary">
  <h1>{% if exception_type %}{{ exception_type }}{% else %}Report{% endif %}"""
  """{% if request %} at {{ request.path_info|escape }}{% endif %}</h1>
  <pre class="exception_value">"""
 """{% if exception_value %}{{ exception_value|force_escape }}{% else %}No exception message supplied{% endif %}"""
"""</pre>
  <table class="meta">
{% if request %}
    <tr>
      <th>Request Method:</th>
      <td>{{ request.META.REQUEST_METHOD }}</td>
    </tr>
    <tr>
      <th>Request URL:</th>
      <td>{{ request.build_absolute_uri|escape }}</td>
    </tr>
{% endif %}
    <tr>
      <th>Django Version:</th>
      <td>{{ django_version_info }}</td>
    </tr>
{% if exception_type %}
    <tr>
      <th>Exception Type:</th>
      <td>{{ exception_type }}</td>
    </tr>
{% endif %}
{% if exception_type and exception_value %}
    <tr>
      <th>Exception Value:</th>
      <td><pre>{{ exception_value|force_escape }}</pre></td>
    </tr>
{% endif %}
{% if lastframe %}
    <tr>
      <th>Exception Location:</th>
      <td>{{ lastframe.filename|escape }} in {{ lastframe.function|escape }}, line {{ lastframe.lineno }}</td>
    </tr>
{% endif %}
    <tr>
      <th>Python Executable:</th>
      <td>{{ sys_executable|escape }}</td>
    </tr>
    <tr>
      <th>Python Version:</th>
      <td>{{ sys_version_info }}</td>
    </tr>
    <tr>
      <th>Python Path:</th>
      <td><pre>{{ sys_path|pprint }}</pre></td>
    </tr>
    <tr>
      <th>Server time:</th>
      <td>{{server_time|date:"r"}}</td>
    </tr>
  </table>
</div>
{% if unicode_hint %}
<div id="unicode-hint">
    <h2>Unicode error hint</h2>
    <p>The string that could not be encoded/decoded was: <strong>{{ unicode_hint|force_escape }}</strong></p>
</div>
{% endif %}
{% if template_does_not_exist %}
<div id="template-not-exist">
    <h2>Template-loader postmortem</h2>
    {% if postmortem %}
        <p class="append-bottom">Django tried loading these templates, in this order:</p>
        {% for entry in postmortem %}
            <p class="postmortem-section">Using engine <code>{{ entry.backend.name }}</code>:</p>
            <ul>
                {% if entry.tried %}
                    {% for attempt in entry.tried %}
                        <li><code>{{ attempt.0.loader_name }}</code>: {{ attempt.0.name }} ({{ attempt.1 }})</li>
                    {% endfor %}
                    </ul>
                {% else %}
                    <li>This engine did not provide a list of tried templates.</li>
                {% endif %}
            </ul>
        {% endfor %}
    {% else %}
        <p>No templates were found because your 'TEMPLATES' setting is not configured.</p>
    {% endif %}
</div>
{% endif %}
{% if template_info %}
<div id="template">
   <h2>Error during template rendering</h2>
   <p>In template <code>{{ template_info.name }}</code>, error at line <strong>{{ template_info.line }}</strong></p>
   <h3>{{ template_info.message }}</h3>
   <table class="source{% if template_info.top %} cut-top{% endif %}
      {% if template_info.bottom != template_info.total %} cut-bottom{% endif %}">
   {% for source_line in template_info.source_lines %}
   {% if source_line.0 == template_info.line %}
   <tr class="error"><th>{{ source_line.0 }}</th>
     <td>{{ template_info.before }}"""
      """<span class="specific">{{ template_info.during }}</span>"""
      """{{ template_info.after }}</td>
   </tr>
   {% else %}
      <tr><th>{{ source_line.0 }}</th>
      <td>{{ source_line.1 }}</td></tr>
   {% endif %}
   {% endfor %}
   </table>
</div>
{% endif %}
{% if frames %}
<div id="traceback">
  <h2>Traceback <span class="commands">{% if not is_email %}<a href="#" onclick="return switchPastebinFriendly(this);">
    Switch to copy-and-paste view</a></span>{% endif %}
  </h2>
  {% autoescape off %}
  <div id="browserTraceback">
    <ul class="traceback">
      {% for frame in frames %}
        {% ifchanged frame.exc_cause %}{% if frame.exc_cause %}
          <li><h3>
          {% if frame.exc_cause_explicit %}
            The above exception ({{ frame.exc_cause }}) was the direct cause of the following exception:
          {% else %}
            During handling of the above exception ({{ frame.exc_cause }}), another exception occurred:
          {% endif %}
        </h3></li>
        {% endif %}{% endifchanged %}
        <li class="frame {{ frame.type }}">
          <code>{{ frame.filename|escape }}</code> in <code>{{ frame.function|escape }}</code>

          {% if frame.context_line %}
            <div class="context" id="c{{ frame.id }}">
              {% if frame.pre_context and not is_email %}
                <ol start="{{ frame.pre_context_lineno }}" class="pre-context" id="pre{{ frame.id }}">
                {% for line in frame.pre_context %}
                  <li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')"><pre>{{ line|escape }}</pre></li>
                {% endfor %}
                </ol>
              {% endif %}
              <ol start="{{ frame.lineno }}" class="context-line">
                <li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')"><pre>
"""            """{{ frame.context_line|escape }}</pre>{% if not is_email %} <span>...</span>{% endif %}</li></ol>
              {% if frame.post_context and not is_email  %}
                <ol start='{{ frame.lineno|add:"1" }}' class="post-context" id="post{{ frame.id }}">
                  {% for line in frame.post_context %}
                  <li onclick="toggle('pre{{ frame.id }}', 'post{{ frame.id }}')"><pre>{{ line|escape }}</pre></li>
                  {% endfor %}
              </ol>
              {% endif %}
            </div>
          {% endif %}

          {% if frame.vars %}
            <div class="commands">
                {% if is_email %}
                    <h2>Local Vars</h2>
                {% else %}
                    <a href="#" onclick="return varToggle(this, '{{ frame.id }}')"><span>&#x25b6;</span> Local vars</a>
                {% endif %}
            </div>
            <table class="vars" id="v{{ frame.id }}">
              <thead>
                <tr>
                  <th>Variable</th>
                  <th>Value</th>
                </tr>
              </thead>
              <tbody>
                {% for var in frame.vars|dictsort:"0" %}
                  <tr>
                    <td>{{ var.0|force_escape }}</td>
                    <td class="code"><pre>{{ var.1 }}</pre></td>
                  </tr>
                {% endfor %}
              </tbody>
            </table>
          {% endif %}
        </li>
      {% endfor %}
    </ul>
  </div>
  {% endautoescape %}
  <form action="http://dpaste.com/" name="pasteform" id="pasteform" method="post">
{% if not is_email %}
  <div id="pastebinTraceback" class="pastebin">
    <input type="hidden" name="language" value="PythonConsole">
    <input type="hidden" name="title"
      value="{{ exception_type|escape }}{% if request %} at {{ request.path_info|escape }}{% endif %}">
    <input type="hidden" name="source" value="Django Dpaste Agent">
    <input type="hidden" name="poster" value="Django">
    <textarea name="content" id="traceback_area" cols="140" rows="25">
Environment:

{% if request %}
Request Method: {{ request.META.REQUEST_METHOD }}
Request URL: {{ request.build_absolute_uri|escape }}
{% endif %}
Django Version: {{ django_version_info }}
Python Version: {{ sys_version_info }}
Installed Applications:
{{ settings.INSTALLED_APPS|pprint }}
Installed Middleware:
{{ settings.MIDDLEWARE_CLASSES|pprint }}

{% if template_does_not_exist %}Template loader postmortem
{% if postmortem %}Django tried loading these templates, in this order:
{% for entry in postmortem %}
Using engine {{ entry.backend.name }}:
{% if entry.tried %}{% for attempt in entry.tried %}    * {{ attempt.0.loader_name }}: {{ attempt.0.name }} ({{ attempt.1 }})
{% endfor %}{% else %}    This engine did not provide a list of tried templates.
{% endif %}{% endfor %}
{% else %}No templates were found because your 'TEMPLATES' setting is not configured.
{% endif %}
{% endif %}{% if template_info %}
Template error:
In template {{ template_info.name }}, error at line {{ template_info.line }}
   {{ template_info.message }}"""
"{% for source_line in template_info.source_lines %}"
"{% if source_line.0 == template_info.line %}"
"   {{ source_line.0 }} : {{ template_info.before }} {{ template_info.during }} {{ template_info.after }}"
"{% else %}"
"   {{ source_line.0 }} : {{ source_line.1 }}"
"""{% endif %}{% endfor %}{% endif %}

Traceback:{% for frame in frames %}
{% ifchanged frame.exc_cause %}{% if frame.exc_cause %}{% if frame.exc_cause_explicit %}
The above exception ({{ frame.exc_cause }}) was the direct cause of the following exception:
{% else %}
During handling of the above exception ({{ frame.exc_cause }}), another exception occurred:
{% endif %}{% endif %}{% endifchanged %}
File "{{ frame.filename|escape }}" in {{ frame.function|escape }}
{% if frame.context_line %}  {{ frame.lineno }}. {{ frame.context_line|escape }}{% endif %}{% endfor %}

Exception Type: {{ exception_type|escape }}{% if request %} at {{ request.path_info|escape }}{% endif %}
Exception Value: {{ exception_value|force_escape }}
</textarea>
  <br><br>
  <input type="submit" value="Share this traceback on a public Web site">
  </div>
</form>
</div>
{% endif %}
{% endif %}

<div id="requestinfo">
  <h2>Request information</h2>

{% if request %}
  <h3 id="get-info">GET</h3>
  {% if request.GET %}
    <table class="req">
      <thead>
        <tr>
          <th>Variable</th>
          <th>Value</th>
        </tr>
      </thead>
      <tbody>
        {% for var in request.GET.items %}
          <tr>
            <td>{{ var.0 }}</td>
            <td class="code"><pre>{{ var.1|pprint }}</pre></td>
          </tr>
        {% endfor %}
      </tbody>
    </table>
  {% else %}
    <p>No GET data</p>
  {% endif %}

  <h3 id="post-info">POST</h3>
  {% if filtered_POST %}
    <table class="req">
      <thead>
        <tr>
          <th>Variable</th>
          <th>Value</th>
        </tr>
      </thead>
      <tbody>
        {% for var in filtered_POST.items %}
          <tr>
            <td>{{ var.0 }}</td>
            <td class="code"><pre>{{ var.1|pprint }}</pre></td>
          </tr>
        {% endfor %}
      </tbody>
    </table>
  {% else %}
    <p>No POST data</p>
  {% endif %}
  <h3 id="files-info">FILES</h3>
  {% if request.FILES %}
    <table class="req">
        <thead>
            <tr>
                <th>Variable</th>
                <th>Value</th>
            </tr>
        </thead>
        <tbody>
            {% for var in request.FILES.items %}
                <tr>
                    <td>{{ var.0 }}</td>
                    <td class="code"><pre>{{ var.1|pprint }}</pre></td>
                </tr>
            {% endfor %}
        </tbody>
    </table>
  {% else %}
    <p>No FILES data</p>
  {% endif %}


  <h3 id="cookie-info">COOKIES</h3>
  {% if request.COOKIES %}
    <table class="req">
      <thead>
        <tr>
          <th>Variable</th>
          <th>Value</th>
        </tr>
      </thead>
      <tbody>
        {% for var in request.COOKIES.items %}
          <tr>
            <td>{{ var.0 }}</td>
            <td class="code"><pre>{{ var.1|pprint }}</pre></td>
          </tr>
        {% endfor %}
      </tbody>
    </table>
  {% else %}
    <p>No cookie data</p>
  {% endif %}

  <h3 id="meta-info">META</h3>
  <table class="req">
    <thead>
      <tr>
        <th>Variable</th>
        <th>Value</th>
      </tr>
    </thead>
    <tbody>
      {% for var in request.META.items|dictsort:"0" %}
        <tr>
          <td>{{ var.0 }}</td>
          <td class="code"><pre>{{ var.1|pprint }}</pre></td>
        </tr>
      {% endfor %}
    </tbody>
  </table>
{% else %}
  <p>Request data not supplied</p>
{% endif %}

  <h3 id="settings-info">Settings</h3>
  <h4>Using settings module <code>{{ settings.SETTINGS_MODULE }}</code></h4>
  <table class="req">
    <thead>
      <tr>
        <th>Setting</th>
        <th>Value</th>
      </tr>
    </thead>
    <tbody>
      {% for var in settings.items|dictsort:"0" %}
        <tr>
          <td>{{ var.0 }}</td>
          <td class="code"><pre>{{ var.1|pprint }}</pre></td>
        </tr>
      {% endfor %}
    </tbody>
  </table>

</div>
{% if not is_email %}
  <div id="explanation">
    <p>
      You're seeing this error because you have <code>DEBUG = True</code> in your
      Django settings file. Change that to <code>False</code>, and Django will
      display a standard page generated by the handler for this status code.
    </p>
  </div>
{% endif %}
</body>
</html>
""")

TECHNICAL_500_TEXT_TEMPLATE = ("""{% firstof exception_type 'Report' %}{% if request %} at {{ request.path_info }}{% endif %}
{% firstof exception_value 'No exception message supplied' %}
{% if request %}
Request Method: {{ request.META.REQUEST_METHOD }}
Request URL: {{ request.build_absolute_uri }}{% endif %}
Django Version: {{ django_version_info }}
Python Executable: {{ sys_executable }}
Python Version: {{ sys_version_info }}
Python Path: {{ sys_path }}
Server time: {{server_time|date:"r"}}
Installed Applications:
{{ settings.INSTALLED_APPS|pprint }}
Installed Middleware:
{{ settings.MIDDLEWARE_CLASSES|pprint }}
{% if template_does_not_exist %}Template loader postmortem
{% if postmortem %}Django tried loading these templates, in this order:
{% for entry in postmortem %}
Using engine {{ entry.backend.name }}:
{% if entry.tried %}{% for attempt in entry.tried %}    * {{ attempt.0.loader_name }}: {{ attempt.0.name }} ({{ attempt.1 }})
{% endfor %}{% else %}    This engine did not provide a list of tried templates.
{% endif %}{% endfor %}
{% else %}No templates were found because your 'TEMPLATES' setting is not configured.
{% endif %}
{% endif %}{% if template_info %}
Template error:
In template {{ template_info.name }}, error at line {{ template_info.line }}
   {{ template_info.message }}
{% for source_line in template_info.source_lines %}"""
"{% if source_line.0 == template_info.line %}"
"   {{ source_line.0 }} : {{ template_info.before }} {{ template_info.during }} {{ template_info.after }}"
"{% else %}"
"   {{ source_line.0 }} : {{ source_line.1 }}"
"""{% endif %}{% endfor %}{% endif %}{% if frames %}

Traceback:"""
"{% for frame in frames %}"
"{% ifchanged frame.exc_cause %}"
"  {% if frame.exc_cause %}" """
    {% if frame.exc_cause_explicit %}
      The above exception ({{ frame.exc_cause }}) was the direct cause of the following exception:
    {% else %}
      During handling of the above exception ({{ frame.exc_cause }}), another exception occurred:
    {% endif %}
  {% endif %}
{% endifchanged %}
File "{{ frame.filename }}" in {{ frame.function }}
{% if frame.context_line %}  {{ frame.lineno }}. {{ frame.context_line }}{% endif %}
{% endfor %}
{% if exception_type %}Exception Type: {{ exception_type }}{% if request %} at {{ request.path_info }}{% endif %}
{% if exception_value %}Exception Value: {{ exception_value }}{% endif %}{% endif %}{% endif %}
{% if request %}Request information:
GET:{% for k, v in request.GET.items %}
{{ k }} = {{ v|stringformat:"r" }}{% empty %} No GET data{% endfor %}

POST:{% for k, v in filtered_POST.items %}
{{ k }} = {{ v|stringformat:"r" }}{% empty %} No POST data{% endfor %}

FILES:{% for k, v in request.FILES.items %}
{{ k }} = {{ v|stringformat:"r" }}{% empty %} No FILES data{% endfor %}

COOKIES:{% for k, v in request.COOKIES.items %}
{{ k }} = {{ v|stringformat:"r" }}{% empty %} No cookie data{% endfor %}

META:{% for k, v in request.META.items|dictsort:"0" %}
{{ k }} = {{ v|stringformat:"r" }}{% endfor %}
{% else %}Request data not supplied
{% endif %}
Settings:
Using settings module {{ settings.SETTINGS_MODULE }}{% for k, v in settings.items|dictsort:"0" %}
{{ k }} = {{ v|stringformat:"r" }}{% endfor %}

{% if not is_email %}
You're seeing this error because you have DEBUG = True in your
Django settings file. Change that to False, and Django will
display a standard page generated by the handler for this status code.
{% endif %}
""")

TECHNICAL_404_TEMPLATE = """
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  <title>Page not found at {{ request.path_info|escape }}</title>
  <meta name="robots" content="NONE,NOARCHIVE">
  <style type="text/css">
    html * { padding:0; margin:0; }
    body * { padding:10px 20px; }
    body * * { padding:0; }
    body { font:small sans-serif; background:#eee; }
    body>div { border-bottom:1px solid #ddd; }
    h1 { font-weight:normal; margin-bottom:.4em; }
    h1 span { font-size:60%; color:#666; font-weight:normal; }
    table { border:none; border-collapse: collapse; width:100%; }
    td, th { vertical-align:top; padding:2px 3px; }
    th { width:12em; text-align:right; color:#666; padding-right:.5em; }
    #info { background:#f6f6f6; }
    #info ol { margin: 0.5em 4em; }
    #info ol li { font-family: monospace; }
    #summary { background: #ffc; }
    #explanation { background:#eee; border-bottom: 0px none; }
  </style>
</head>
<body>
  <div id="summary">
    <h1>Page not found <span>(404)</span></h1>
    <table class="meta">
      <tr>
        <th>Request Method:</th>
        <td>{{ request.META.REQUEST_METHOD }}</td>
      </tr>
      <tr>
        <th>Request URL:</th>
        <td>{{ request.build_absolute_uri|escape }}</td>
      </tr>
      {% if raising_view_name %}
      <tr>
        <th>Raised by:</th>
        <td>{{ raising_view_name }}</td>
      </tr>
      {% endif %}
    </table>
  </div>
  <div id="info">
    {% if urlpatterns %}
      <p>
      Using the URLconf defined in <code>{{ urlconf }}</code>,
      Django tried these URL patterns, in this order:
      </p>
      <ol>
        {% for pattern in urlpatterns %}
          <li>
            {% for pat in pattern %}
                {{ pat.regex.pattern }}
                {% if forloop.last and pat.name %}[name='{{ pat.name }}']{% endif %}
            {% endfor %}
          </li>
        {% endfor %}
      </ol>
      <p>The current URL, <code>{{ request_path|escape }}</code>, didn't match any of these.</p>
    {% else %}
      <p>{{ reason }}</p>
    {% endif %}
  </div>

  <div id="explanation">
    <p>
      You're seeing this error because you have <code>DEBUG = True</code> in
      your Django settings file. Change that to <code>False</code>, and Django
      will display a standard 404 page.
    </p>
  </div>
</body>
</html>
"""

DEFAULT_URLCONF_TEMPLATE = """
<!DOCTYPE html>
<html lang="en"><head>
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  <meta name="robots" content="NONE,NOARCHIVE"><title>{{ title }}</title>
  <style type="text/css">
    html * { padding:0; margin:0; }
    body * { padding:10px 20px; }
    body * * { padding:0; }
    body { font:small sans-serif; }
    body>div { border-bottom:1px solid #ddd; }
    h1 { font-weight:normal; }
    h2 { margin-bottom:.8em; }
    h2 span { font-size:80%; color:#666; font-weight:normal; }
    h3 { margin:1em 0 .5em 0; }
    h4 { margin:0 0 .5em 0; font-weight: normal; }
    table { border:1px solid #ccc; border-collapse: collapse; width:100%; background:white; }
    tbody td, tbody th { vertical-align:top; padding:2px 3px; }
    thead th {
      padding:1px 6px 1px 3px; background:#fefefe; text-align:left;
      font-weight:normal; font-size:11px; border:1px solid #ddd;
    }
    tbody th { width:12em; text-align:right; color:#666; padding-right:.5em; }
    #summary { background: #e0ebff; }
    #summary h2 { font-weight: normal; color: #666; }
    #explanation { background:#eee; }
    #instructions { background:#f6f6f6; }
    #summary table { border:none; background:transparent; }
  </style>
</head>

<body>
<div id="summary">
  <h1>{{ heading }}</h1>
  <h2>{{ subheading }}</h2>
</div>

<div id="instructions">
  <p>
    {{ instructions|safe }}
  </p>
</div>

<div id="explanation">
  <p>
    {{ explanation|safe }}
  </p>
</div>
</body></html>
"""