This file is indexed.

/usr/share/pyshared/paste/deploy/loadwsgi.py is in python-pastedeploy 1.5.0-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 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
# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
from __future__ import with_statement
import os
import sys
import re

import pkg_resources

from paste.deploy.compat import ConfigParser, unquote, iteritems
from paste.deploy.util import fix_call, lookup_object

__all__ = ['loadapp', 'loadserver', 'loadfilter', 'appconfig']


############################################################
## Utility functions
############################################################


def import_string(s):
    return pkg_resources.EntryPoint.parse("x=" + s).load(False)


def _aslist(obj):
    """
    Turn object into a list; lists and tuples are left as-is, None
    becomes [], and everything else turns into a one-element list.
    """
    if obj is None:
        return []
    elif isinstance(obj, (list, tuple)):
        return obj
    else:
        return [obj]


def _flatten(lst):
    """
    Flatten a nested list.
    """
    if not isinstance(lst, (list, tuple)):
        return [lst]
    result = []
    for item in lst:
        result.extend(_flatten(item))
    return result


class NicerConfigParser(ConfigParser):

    def __init__(self, filename, *args, **kw):
        ConfigParser.__init__(self, *args, **kw)
        self.filename = filename
        if hasattr(self, '_interpolation'):
            self._interpolation = self.InterpolateWrapper(self._interpolation)

    read_file = getattr(ConfigParser, 'read_file', ConfigParser.readfp)

    def defaults(self):
        """Return the defaults, with their values interpolated (with the
        defaults dict itself)

        Mainly to support defaults using values such as %(here)s
        """
        defaults = ConfigParser.defaults(self).copy()
        for key, val in iteritems(defaults):
            defaults[key] = self.get('DEFAULT', key) or val
        return defaults

    def _interpolate(self, section, option, rawval, vars):
        # Python < 3.2
        try:
            return ConfigParser._interpolate(
                self, section, option, rawval, vars)
        except Exception:
            e = sys.exc_info()[1]
            args = list(e.args)
            args[0] = 'Error in file %s: %s' % (self.filename, e)
            e.args = tuple(args)
            e.message = args[0]
            raise

    class InterpolateWrapper(object):
        # Python >= 3.2
        def __init__(self, original):
            self._original = original

        def __getattr__(self, name):
            return getattr(self._original, name)

        def before_get(self, parser, section, option, value, defaults):
            try:
                return self._original.before_get(parser, section, option,
                                                 value, defaults)
            except Exception:
                e = sys.exc_info()[1]
                args = list(e.args)
                args[0] = 'Error in file %s: %s' % (parser.filename, e)
                e.args = tuple(args)
                e.message = args[0]
                raise


############################################################
## Object types
############################################################


class _ObjectType(object):

    name = None
    egg_protocols = None
    config_prefixes = None

    def __init__(self):
        # Normalize these variables:
        self.egg_protocols = [_aslist(p) for p in _aslist(self.egg_protocols)]
        self.config_prefixes = [_aslist(p) for p in _aslist(self.config_prefixes)]

    def __repr__(self):
        return '<%s protocols=%r prefixes=%r>' % (
            self.name, self.egg_protocols, self.config_prefixes)

    def invoke(self, context):
        assert context.protocol in _flatten(self.egg_protocols)
        return fix_call(context.object,
                        context.global_conf, **context.local_conf)


class _App(_ObjectType):

    name = 'application'
    egg_protocols = ['paste.app_factory', 'paste.composite_factory',
                     'paste.composit_factory']
    config_prefixes = [['app', 'application'], ['composite', 'composit'],
                       'pipeline', 'filter-app']

    def invoke(self, context):
        if context.protocol in ('paste.composit_factory',
                                'paste.composite_factory'):
            return fix_call(context.object,
                            context.loader, context.global_conf,
                            **context.local_conf)
        elif context.protocol == 'paste.app_factory':
            return fix_call(context.object, context.global_conf, **context.local_conf)
        else:
            assert 0, "Protocol %r unknown" % context.protocol

APP = _App()


class _Filter(_ObjectType):
    name = 'filter'
    egg_protocols = [['paste.filter_factory', 'paste.filter_app_factory']]
    config_prefixes = ['filter']

    def invoke(self, context):
        if context.protocol == 'paste.filter_factory':
            return fix_call(context.object,
                            context.global_conf, **context.local_conf)
        elif context.protocol == 'paste.filter_app_factory':
            def filter_wrapper(wsgi_app):
                # This should be an object, so it has a nicer __repr__
                return fix_call(context.object,
                                wsgi_app, context.global_conf,
                                **context.local_conf)
            return filter_wrapper
        else:
            assert 0, "Protocol %r unknown" % context.protocol

FILTER = _Filter()


class _Server(_ObjectType):
    name = 'server'
    egg_protocols = [['paste.server_factory', 'paste.server_runner']]
    config_prefixes = ['server']

    def invoke(self, context):
        if context.protocol == 'paste.server_factory':
            return fix_call(context.object,
                            context.global_conf, **context.local_conf)
        elif context.protocol == 'paste.server_runner':
            def server_wrapper(wsgi_app):
                # This should be an object, so it has a nicer __repr__
                return fix_call(context.object,
                                wsgi_app, context.global_conf,
                                **context.local_conf)
            return server_wrapper
        else:
            assert 0, "Protocol %r unknown" % context.protocol

SERVER = _Server()


# Virtual type: (@@: There's clearly something crufty here;
# this probably could be more elegant)
class _PipeLine(_ObjectType):
    name = 'pipeline'

    def invoke(self, context):
        app = context.app_context.create()
        filters = [c.create() for c in context.filter_contexts]
        filters.reverse()
        for filter in filters:
            app = filter(app)
        return app

PIPELINE = _PipeLine()


class _FilterApp(_ObjectType):
    name = 'filter_app'

    def invoke(self, context):
        next_app = context.next_context.create()
        filter = context.filter_context.create()
        return filter(next_app)

FILTER_APP = _FilterApp()


class _FilterWith(_App):
    name = 'filtered_with'

    def invoke(self, context):
        filter = context.filter_context.create()
        filtered = context.next_context.create()
        if context.next_context.object_type is APP:
            return filter(filtered)
        else:
            # filtering a filter
            def composed(app):
                return filter(filtered(app))
            return composed

FILTER_WITH = _FilterWith()


############################################################
## Loaders
############################################################


def loadapp(uri, name=None, **kw):
    return loadobj(APP, uri, name=name, **kw)


def loadfilter(uri, name=None, **kw):
    return loadobj(FILTER, uri, name=name, **kw)


def loadserver(uri, name=None, **kw):
    return loadobj(SERVER, uri, name=name, **kw)


def appconfig(uri, name=None, relative_to=None, global_conf=None):
    context = loadcontext(APP, uri, name=name,
                          relative_to=relative_to,
                          global_conf=global_conf)
    return context.config()

_loaders = {}


def loadobj(object_type, uri, name=None, relative_to=None,
            global_conf=None):
    context = loadcontext(
        object_type, uri, name=name, relative_to=relative_to,
        global_conf=global_conf)
    return context.create()


def loadcontext(object_type, uri, name=None, relative_to=None,
                global_conf=None):
    if '#' in uri:
        if name is None:
            uri, name = uri.split('#', 1)
        else:
            # @@: Ignore fragment or error?
            uri = uri.split('#', 1)[0]
    if name is None:
        name = 'main'
    if ':' not in uri:
        raise LookupError("URI has no scheme: %r" % uri)
    scheme, path = uri.split(':', 1)
    scheme = scheme.lower()
    if scheme not in _loaders:
        raise LookupError(
            "URI scheme not known: %r (from %s)"
            % (scheme, ', '.join(_loaders.keys())))
    return _loaders[scheme](
        object_type,
        uri, path, name=name, relative_to=relative_to,
        global_conf=global_conf)


def _loadconfig(object_type, uri, path, name, relative_to,
                global_conf):
    isabs = os.path.isabs(path)
    # De-Windowsify the paths:
    path = path.replace('\\', '/')
    if not isabs:
        if not relative_to:
            raise ValueError(
                "Cannot resolve relative uri %r; no relative_to keyword "
                "argument given" % uri)
        relative_to = relative_to.replace('\\', '/')
        if relative_to.endswith('/'):
            path = relative_to + path
        else:
            path = relative_to + '/' + path
    if path.startswith('///'):
        path = path[2:]
    path = unquote(path)
    loader = ConfigLoader(path)
    if global_conf:
        loader.update_defaults(global_conf, overwrite=False)
    return loader.get_context(object_type, name, global_conf)

_loaders['config'] = _loadconfig


def _loadegg(object_type, uri, spec, name, relative_to,
             global_conf):
    loader = EggLoader(spec)
    return loader.get_context(object_type, name, global_conf)

_loaders['egg'] = _loadegg


def _loadfunc(object_type, uri, spec, name, relative_to,
             global_conf):

    loader = FuncLoader(spec)
    return loader.get_context(object_type, name, global_conf)

_loaders['call'] = _loadfunc

############################################################
## Loaders
############################################################


class _Loader(object):

    def get_app(self, name=None, global_conf=None):
        return self.app_context(
            name=name, global_conf=global_conf).create()

    def get_filter(self, name=None, global_conf=None):
        return self.filter_context(
            name=name, global_conf=global_conf).create()

    def get_server(self, name=None, global_conf=None):
        return self.server_context(
            name=name, global_conf=global_conf).create()

    def app_context(self, name=None, global_conf=None):
        return self.get_context(
            APP, name=name, global_conf=global_conf)

    def filter_context(self, name=None, global_conf=None):
        return self.get_context(
            FILTER, name=name, global_conf=global_conf)

    def server_context(self, name=None, global_conf=None):
        return self.get_context(
            SERVER, name=name, global_conf=global_conf)

    _absolute_re = re.compile(r'^[a-zA-Z]+:')

    def absolute_name(self, name):
        """
        Returns true if the name includes a scheme
        """
        if name is None:
            return False
        return self._absolute_re.search(name)


class ConfigLoader(_Loader):

    def __init__(self, filename):
        self.filename = filename = filename.strip()
        defaults = {
            'here': os.path.dirname(os.path.abspath(filename)),
            '__file__': os.path.abspath(filename)
            }
        self.parser = NicerConfigParser(filename, defaults=defaults)
        self.parser.optionxform = str  # Don't lower-case keys
        with open(filename) as f:
            self.parser.read_file(f)

    def update_defaults(self, new_defaults, overwrite=True):
        for key, value in iteritems(new_defaults):
            if not overwrite and key in self.parser._defaults:
                continue
            self.parser._defaults[key] = value

    def get_context(self, object_type, name=None, global_conf=None):
        if self.absolute_name(name):
            return loadcontext(object_type, name,
                               relative_to=os.path.dirname(self.filename),
                               global_conf=global_conf)
        section = self.find_config_section(
            object_type, name=name)
        if global_conf is None:
            global_conf = {}
        else:
            global_conf = global_conf.copy()
        defaults = self.parser.defaults()
        global_conf.update(defaults)
        local_conf = {}
        global_additions = {}
        get_from_globals = {}
        for option in self.parser.options(section):
            if option.startswith('set '):
                name = option[4:].strip()
                global_additions[name] = global_conf[name] = (
                    self.parser.get(section, option))
            elif option.startswith('get '):
                name = option[4:].strip()
                get_from_globals[name] = self.parser.get(section, option)
            else:
                if option in defaults:
                    # @@: It's a global option (?), so skip it
                    continue
                local_conf[option] = self.parser.get(section, option)
        for local_var, glob_var in get_from_globals.items():
            local_conf[local_var] = global_conf[glob_var]
        if object_type in (APP, FILTER) and 'filter-with' in local_conf:
            filter_with = local_conf.pop('filter-with')
        else:
            filter_with = None
        if 'require' in local_conf:
            for spec in local_conf['require'].split():
                pkg_resources.require(spec)
            del local_conf['require']
        if section.startswith('filter-app:'):
            context = self._filter_app_context(
                object_type, section, name=name,
                global_conf=global_conf, local_conf=local_conf,
                global_additions=global_additions)
        elif section.startswith('pipeline:'):
            context = self._pipeline_app_context(
                object_type, section, name=name,
                global_conf=global_conf, local_conf=local_conf,
                global_additions=global_additions)
        elif 'use' in local_conf:
            context = self._context_from_use(
                object_type, local_conf, global_conf, global_additions,
                section)
        else:
            context = self._context_from_explicit(
                object_type, local_conf, global_conf, global_additions,
                section)
        if filter_with is not None:
            filter_with_context = LoaderContext(
                obj=None,
                object_type=FILTER_WITH,
                protocol=None,
                global_conf=global_conf, local_conf=local_conf,
                loader=self)
            filter_with_context.filter_context = self.filter_context(
                name=filter_with, global_conf=global_conf)
            filter_with_context.next_context = context
            return filter_with_context
        return context

    def _context_from_use(self, object_type, local_conf, global_conf,
                          global_additions, section):
        use = local_conf.pop('use')
        context = self.get_context(
            object_type, name=use, global_conf=global_conf)
        context.global_conf.update(global_additions)
        context.local_conf.update(local_conf)
        if '__file__' in global_conf:
            # use sections shouldn't overwrite the original __file__
            context.global_conf['__file__'] = global_conf['__file__']
        # @@: Should loader be overwritten?
        context.loader = self

        if context.protocol is None:
            # Determine protocol from section type
            section_protocol = section.split(':', 1)[0]
            if section_protocol in ('application', 'app'):
                context.protocol = 'paste.app_factory'
            elif section_protocol in ('composit', 'composite'):
                context.protocol = 'paste.composit_factory'
            else:
                # This will work with 'server' and 'filter', otherwise it
                # could fail but there is an error message already for
                # bad protocols
                context.protocol = 'paste.%s_factory' % context_protocol

        return context

    def _context_from_explicit(self, object_type, local_conf, global_conf,
                               global_addition, section):
        possible = []
        for protocol_options in object_type.egg_protocols:
            for protocol in protocol_options:
                if protocol in local_conf:
                    possible.append((protocol, local_conf[protocol]))
                    break
        if len(possible) > 1:
            raise LookupError(
                "Multiple protocols given in section %r: %s"
                % (section, possible))
        if not possible:
            raise LookupError(
                "No loader given in section %r" % section)
        found_protocol, found_expr = possible[0]
        del local_conf[found_protocol]
        value = import_string(found_expr)
        context = LoaderContext(
            value, object_type, found_protocol,
            global_conf, local_conf, self)
        return context

    def _filter_app_context(self, object_type, section, name,
                            global_conf, local_conf, global_additions):
        if 'next' not in local_conf:
            raise LookupError(
                "The [%s] section in %s is missing a 'next' setting"
                % (section, self.filename))
        next_name = local_conf.pop('next')
        context = LoaderContext(None, FILTER_APP, None, global_conf,
                                local_conf, self)
        context.next_context = self.get_context(
            APP, next_name, global_conf)
        if 'use' in local_conf:
            context.filter_context = self._context_from_use(
                FILTER, local_conf, global_conf, global_additions,
                section)
        else:
            context.filter_context = self._context_from_explicit(
                FILTER, local_conf, global_conf, global_additions,
                section)
        return context

    def _pipeline_app_context(self, object_type, section, name,
                              global_conf, local_conf, global_additions):
        if 'pipeline' not in local_conf:
            raise LookupError(
                "The [%s] section in %s is missing a 'pipeline' setting"
                % (section, self.filename))
        pipeline = local_conf.pop('pipeline').split()
        if local_conf:
            raise LookupError(
                "The [%s] pipeline section in %s has extra "
                "(disallowed) settings: %s"
                % (', '.join(local_conf.keys())))
        context = LoaderContext(None, PIPELINE, None, global_conf,
                                local_conf, self)
        context.app_context = self.get_context(
            APP, pipeline[-1], global_conf)
        context.filter_contexts = [
            self.get_context(FILTER, name, global_conf)
            for name in pipeline[:-1]]
        return context

    def find_config_section(self, object_type, name=None):
        """
        Return the section name with the given name prefix (following the
        same pattern as ``protocol_desc`` in ``config``.  It must have the
        given name, or for ``'main'`` an empty name is allowed.  The
        prefix must be followed by a ``:``.

        Case is *not* ignored.
        """
        possible = []
        for name_options in object_type.config_prefixes:
            for name_prefix in name_options:
                found = self._find_sections(
                    self.parser.sections(), name_prefix, name)
                if found:
                    possible.extend(found)
                    break
        if not possible:
            raise LookupError(
                "No section %r (prefixed by %s) found in config %s"
                % (name,
                   ' or '.join(map(repr, _flatten(object_type.config_prefixes))),
                   self.filename))
        if len(possible) > 1:
            raise LookupError(
                "Ambiguous section names %r for section %r (prefixed by %s) "
                "found in config %s"
                % (possible, name,
                   ' or '.join(map(repr, _flatten(object_type.config_prefixes))),
                   self.filename))
        return possible[0]

    def _find_sections(self, sections, name_prefix, name):
        found = []
        if name is None:
            if name_prefix in sections:
                found.append(name_prefix)
            name = 'main'
        for section in sections:
            if section.startswith(name_prefix + ':'):
                if section[len(name_prefix) + 1:].strip() == name:
                    found.append(section)
        return found


class EggLoader(_Loader):

    def __init__(self, spec):
        self.spec = spec

    def get_context(self, object_type, name=None, global_conf=None):
        if self.absolute_name(name):
            return loadcontext(object_type, name,
                               global_conf=global_conf)
        entry_point, protocol, ep_name = self.find_egg_entry_point(
            object_type, name=name)
        return LoaderContext(
            entry_point,
            object_type,
            protocol,
            global_conf or {}, {},
            self,
            distribution=pkg_resources.get_distribution(self.spec),
            entry_point_name=ep_name)

    def find_egg_entry_point(self, object_type, name=None):
        """
        Returns the (entry_point, protocol) for the with the given
        ``name``.
        """
        if name is None:
            name = 'main'
        possible = []
        for protocol_options in object_type.egg_protocols:
            for protocol in protocol_options:
                pkg_resources.require(self.spec)
                entry = pkg_resources.get_entry_info(
                    self.spec,
                    protocol,
                    name)
                if entry is not None:
                    possible.append((entry.load(), protocol, entry.name))
                    break
        if not possible:
            # Better exception
            dist = pkg_resources.get_distribution(self.spec)
            raise LookupError(
                "Entry point %r not found in egg %r (dir: %s; protocols: %s; "
                "entry_points: %s)"
                % (name, self.spec,
                   dist.location,
                   ', '.join(_flatten(object_type.egg_protocols)),
                   ', '.join(_flatten([
                (pkg_resources.get_entry_info(self.spec, prot, name) or {}).keys()
                for prot in protocol_options] or '(no entry points)'))))
        if len(possible) > 1:
            raise LookupError(
                "Ambiguous entry points for %r in egg %r (protocols: %s)"
                % (name, self.spec, ', '.join(_flatten(protocol_options))))
        return possible[0]


class FuncLoader(_Loader):
    """ Loader that supports specifying functions inside modules, without
    using eggs at all. Configuration should be in the format:
        use = call:my.module.path:function_name
        
    Dot notation is supported in both the module and function name, e.g.:
        use = call:my.module.path:object.method
    """
    def __init__(self, spec):
        self.spec = spec
        if not ':' in spec:
            raise LookupError("Configuration not in format module:function")

    def get_context(self, object_type, name=None, global_conf=None):
        obj = lookup_object(self.spec)
        return LoaderContext(
            obj,
            object_type,
            None, # determine protocol from section type
            global_conf or {},
            {},
            self,
            )


class LoaderContext(object):

    def __init__(self, obj, object_type, protocol,
                 global_conf, local_conf, loader,
                 distribution=None, entry_point_name=None):
        self.object = obj
        self.object_type = object_type
        self.protocol = protocol
        #assert protocol in _flatten(object_type.egg_protocols), (
        #    "Bad protocol %r; should be one of %s"
        #    % (protocol, ', '.join(map(repr, _flatten(object_type.egg_protocols)))))
        self.global_conf = global_conf
        self.local_conf = local_conf
        self.loader = loader
        self.distribution = distribution
        self.entry_point_name = entry_point_name

    def create(self):
        return self.object_type.invoke(self)

    def config(self):
        conf = AttrDict(self.global_conf)
        conf.update(self.local_conf)
        conf.local_conf = self.local_conf
        conf.global_conf = self.global_conf
        conf.context = self
        return conf


class AttrDict(dict):
    """
    A dictionary that can be assigned to.
    """
    pass