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# -*- coding: utf-8 -*-
# python-json-patch - An implementation of the JSON Patch format
# https://github.com/stefankoegl/python-json-patch
# Copyright (c) 2011 Stefan Kögl <stefan@skoegl.net>
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
""" Apply JSON-Patches (RFC 6902) """
from __future__ import unicode_literals
import collections
import copy
import functools
import json
from jsonpointer import JsonPointer, JsonPointerException
_ST_ADD = 0
_ST_REMOVE = 1
    from collections.abc import MutableMapping, MutableSequence
except ImportError:
    from collections import MutableMapping, MutableSequence
    str = unicode
# Will be parsed by setup.py to determine package metadata
__author__ = 'Stefan Kögl <stefan@skoegl.net>'
__version__ = '1.24'
__website__ = 'https://github.com/stefankoegl/python-json-patch'
__license__ = 'Modified BSD License'
# pylint: disable=E0611,W0404
if sys.version_info >= (3, 0):
    basestring = (bytes, str)  # pylint: disable=C0103,W0622
class JsonPatchException(Exception):
    """Base Json Patch exception"""
class InvalidJsonPatch(JsonPatchException):
    """ Raised if an invalid JSON Patch is created """
class JsonPatchConflict(JsonPatchException):
    """Raised if patch could not be applied due to conflict situation such as:
    - attempt to add object key when it already exists;
    - attempt to operate with nonexistence object key;
    - attempt to insert value to array at position beyond its size;
class JsonPatchTestFailed(JsonPatchException, AssertionError):
    """ A Test operation failed """
def multidict(ordered_pairs):
    """Convert duplicate keys values to lists."""
    # read all values into lists
    mdict = collections.defaultdict(list)
    for key, value in ordered_pairs:
        mdict[key].append(value)
    return dict(
        # unpack lists that have only 1 item
        (key, values[0] if len(values) == 1 else values)
        for key, values in mdict.items()
# The "object_pairs_hook" parameter is used to handle duplicate keys when
# loading a JSON object.
_jsonloads = functools.partial(json.loads, object_pairs_hook=multidict)
def apply_patch(doc, patch, in_place=False, pointer_cls=JsonPointer):
    """Apply list of patches to specified json document.
    :param doc: Document object.
    :type doc: dict
    :param patch: JSON patch as list of dicts or raw JSON-encoded string.
    :type patch: list or str
    :param in_place: While :const:`True` patch will modify target document.
                     By default patch will be applied to document copy.
    :type in_place: bool
    :param pointer_cls: JSON pointer class to use.
    :type pointer_cls: Type[JsonPointer]
    :return: Patched document object.
    :rtype: dict
    >>> doc = {'foo': 'bar'}
    >>> patch = [{'op': 'add', 'path': '/baz', 'value': 'qux'}]
    >>> other = apply_patch(doc, patch)
    >>> doc is not other
    >>> other == {'foo': 'bar', 'baz': 'qux'}
    >>> patch = [{'op': 'add', 'path': '/baz', 'value': 'qux'}]
    >>> apply_patch(doc, patch, in_place=True) == {'foo': 'bar', 'baz': 'qux'}
    >>> doc == other
    if isinstance(patch, basestring):
        patch = JsonPatch.from_string(patch, pointer_cls=pointer_cls)
        patch = JsonPatch(patch, pointer_cls=pointer_cls)
    return patch.apply(doc, in_place)
def make_patch(src, dst, pointer_cls=JsonPointer):
    """Generates patch by comparing two document objects. Actually is
    a proxy to :meth:`JsonPatch.from_diff` method.
    :param src: Data source document object.
    :type src: dict
    :param dst: Data source document object.
    :type dst: dict
    :param pointer_cls: JSON pointer class to use.
    :type pointer_cls: Type[JsonPointer]
    >>> src = {'foo': 'bar', 'numbers': [1, 3, 4, 8]}
    >>> dst = {'baz': 'qux', 'numbers': [1, 4, 7]}
    >>> patch = make_patch(src, dst)
    >>> new = patch.apply(src)
    >>> new == dst
    return JsonPatch.from_diff(src, dst, pointer_cls=pointer_cls)
class JsonPatch(object):
    json_dumper = staticmethod(json.dumps)
    json_loader = staticmethod(_jsonloads)
    """A JSON Patch is a list of Patch Operations.
    >>> patch = JsonPatch([
    ...     {'op': 'add', 'path': '/foo', 'value': 'bar'},
    ...     {'op': 'add', 'path': '/baz', 'value': [1, 2, 3]},
    ...     {'op': 'remove', 'path': '/baz/1'},
    ...     {'op': 'test', 'path': '/baz', 'value': [1, 3]},
    ...     {'op': 'replace', 'path': '/baz/0', 'value': 42},
    ...     {'op': 'remove', 'path': '/baz/1'},
    >>> doc = {}
    >>> result = patch.apply(doc)
    >>> expected = {'foo': 'bar', 'baz': [42]}
    >>> result == expected
    JsonPatch object is iterable, so you can easily access each patch
    statement in a loop:
    >>> lpatch = list(patch)
    >>> expected = {'op': 'add', 'path': '/foo', 'value': 'bar'}
    >>> lpatch[0] == expected
    >>> lpatch == patch.patch
    Also JsonPatch could be converted directly to :class:`bool` if it contains
    any operation statements:
    >>> bool(patch)
    >>> bool(JsonPatch([]))
    This behavior is very handy with :func:`make_patch` to write more readable
    >>> old = {'foo': 'bar', 'numbers': [1, 3, 4, 8]}
    >>> new = {'baz': 'qux', 'numbers': [1, 4, 7]}
    >>> patch = make_patch(old, new)
    >>> if patch:
    ...     # document have changed, do something useful
    ...     patch.apply(old)    #doctest: +ELLIPSIS
    def __init__(self, patch, pointer_cls=JsonPointer):
        self.patch = patch
        self.pointer_cls = pointer_cls
        self.operations = {
            'remove': RemoveOperation,
            'add': AddOperation,
            'replace': ReplaceOperation,
            'move': MoveOperation,
            'test': TestOperation,
            'copy': CopyOperation,
        # Verify that the structure of the patch document
        # is correct by retrieving each patch element.
        # Much of the validation is done in the initializer
        # though some is delayed until the patch is applied.
        for op in self.patch:
            self._get_operation(op)
    def __str__(self):
        """str(self) -> self.to_string()"""
        return self.to_string()
    def __bool__(self):
        return bool(self.patch)
    __nonzero__ = __bool__
    def __iter__(self):
        return iter(self.patch)
    def __hash__(self):
        return hash(tuple(self._ops))
    def __eq__(self, other):
        if not isinstance(other, JsonPatch):
            return False
        return self._ops == other._ops
    def __ne__(self, other):
        return not(self == other)
    @classmethod
    def from_string(cls, patch_str, loads=None, pointer_cls=JsonPointer):
        """Creates JsonPatch instance from string source.
        :param patch_str: JSON patch as raw string.
        :type patch_str: str
        :param loads: A function of one argument that loads a serialized
                      JSON string.
        :type loads: function
        :param pointer_cls: JSON pointer class to use.
        :type pointer_cls: Type[JsonPointer]
        :return: :class:`JsonPatch` instance.
        """
        json_loader = loads or cls.json_loader
        patch = json_loader(patch_str)
        return cls(patch, pointer_cls=pointer_cls)
    @classmethod
    def from_diff(
            cls, src, dst, optimization=True, dumps=None,
            pointer_cls=JsonPointer,
        """Creates JsonPatch instance based on comparison of two document
        objects. Json patch would be created for `src` argument against `dst`
        one.
        :param src: Data source document object.
        :type src: dict
        :param dst: Data source document object.
        :type dst: dict
        :param dumps: A function of one argument that produces a serialized
                      JSON string.
        :type dumps: function
        :param pointer_cls: JSON pointer class to use.
        :type pointer_cls: Type[JsonPointer]
        :return: :class:`JsonPatch` instance.
        >>> src = {'foo': 'bar', 'numbers': [1, 3, 4, 8]}
        >>> dst = {'baz': 'qux', 'numbers': [1, 4, 7]}
        >>> patch = JsonPatch.from_diff(src, dst)
        >>> new = patch.apply(src)
        >>> new == dst
        True
        """
        json_dumper = dumps or cls.json_dumper
        builder = DiffBuilder(json_dumper, pointer_cls=pointer_cls)
        builder._compare_values('', None, src, dst)
        ops = list(builder.execute())
        return cls(ops, pointer_cls=pointer_cls)
    def to_string(self, dumps=None):
        """Returns patch set as JSON string."""
        json_dumper = dumps or self.json_dumper
        return json_dumper(self.patch)
    @property
    def _ops(self):
        return tuple(map(self._get_operation, self.patch))
    def apply(self, obj, in_place=False):
        """Applies the patch to a given object.
        :param obj: Document object.
        :type obj: dict
        :param in_place: Tweaks the way how patch would be applied - directly to
                         specified `obj` or to its copy.
        :type in_place: bool
        :return: Modified `obj`.
        """
        if not in_place:
            obj = copy.deepcopy(obj)
        for operation in self._ops:
            obj = operation.apply(obj)
        return obj
    def _get_operation(self, operation):
        if 'op' not in operation:
            raise InvalidJsonPatch("Operation does not contain 'op' member")
        op = operation['op']
        if not isinstance(op, basestring):
            raise InvalidJsonPatch("Operation must be a string")
        if op not in self.operations:
            raise InvalidJsonPatch("Unknown operation {0!r}".format(op))
        cls = self.operations[op]
        return cls(operation, pointer_cls=self.pointer_cls)
class PatchOperation(object):
    """A single operation inside a JSON Patch."""
    def __init__(self, operation, pointer_cls=JsonPointer):
        self.pointer_cls = pointer_cls
        if not operation.__contains__('path'):
            raise InvalidJsonPatch("Operation must have a 'path' member")
        if isinstance(operation['path'], self.pointer_cls):
            self.location = operation['path'].path
            self.pointer = operation['path']
        else:
            self.location = operation['path']
            try:
                self.pointer = self.pointer_cls(self.location)
            except TypeError as ex:
                raise InvalidJsonPatch("Invalid 'path'")
        self.operation = operation
    def apply(self, obj):
        """Abstract method that applies a patch operation to the specified object."""
        raise NotImplementedError('should implement the patch operation.')
    def __hash__(self):
        return hash(frozenset(self.operation.items()))
    def __eq__(self, other):
        if not isinstance(other, PatchOperation):
            return False
        return self.operation == other.operation
    def __ne__(self, other):
        return not(self == other)
    @property
    def path(self):
        return '/'.join(self.pointer.parts[:-1])
    @property
    def key(self):
        try:
            return int(self.pointer.parts[-1])
        except ValueError:
            return self.pointer.parts[-1]
    @key.setter
    def key(self, value):
        self.pointer.parts[-1] = str(value)
        self.location = self.pointer.path
        self.operation['path'] = self.location
class RemoveOperation(PatchOperation):
    """Removes an object property or an array element."""
    def apply(self, obj):
        subobj, part = self.pointer.to_last(obj)
        try:
            del subobj[part]
        except (KeyError, IndexError) as ex:
            msg = "can't remove a non-existent object '{0}'".format(part)
            raise JsonPatchConflict(msg)
        return obj
    def _on_undo_remove(self, path, key):
        if self.path == path:
            if self.key >= key:
                self.key += 1
            else:
                key -= 1
        return key
    def _on_undo_add(self, path, key):
        if self.path == path:
            if self.key > key:
                self.key -= 1
            else:
                key -= 1
        return key
class AddOperation(PatchOperation):
    """Adds an object property or an array element."""
    def apply(self, obj):
        try:
            value = self.operation["value"]
        except KeyError as ex:
            raise InvalidJsonPatch(
                "The operation does not contain a 'value' member")
        subobj, part = self.pointer.to_last(obj)
        if isinstance(subobj, MutableSequence):
            if part == '-':
                subobj.append(value)  # pylint: disable=E1103
            elif part > len(subobj) or part < 0:
                raise JsonPatchConflict("can't insert outside of list")
            else:
                subobj.insert(part, value)  # pylint: disable=E1103
        elif isinstance(subobj, MutableMapping):
            if part is None:
                obj = value  # we're replacing the root
            else:
                subobj[part] = value
        else:
            if part is None:
                raise TypeError("invalid document type {0}".format(type(subobj)))
            else:
                raise JsonPatchConflict("unable to fully resolve json pointer {0}, part {1}".format(self.location, part))
        return obj
    def _on_undo_remove(self, path, key):
        if self.path == path:
            if self.key > key:
                self.key += 1
            else:
                key += 1
        return key
    def _on_undo_add(self, path, key):
        if self.path == path:
            if self.key > key:
                self.key -= 1
            else:
                key += 1
        return key
class ReplaceOperation(PatchOperation):
    """Replaces an object property or an array element by a new value."""
    def apply(self, obj):
        try:
            value = self.operation["value"]
        except KeyError as ex:
            raise InvalidJsonPatch(
                "The operation does not contain a 'value' member")
        subobj, part = self.pointer.to_last(obj)
        if part is None:
            return value
        if part == "-":
            raise InvalidJsonPatch("'path' with '-' can't be applied to 'replace' operation")
        if isinstance(subobj, MutableSequence):
            if part >= len(subobj) or part < 0:
                raise JsonPatchConflict("can't replace outside of list")
        elif isinstance(subobj, MutableMapping):
            if part not in subobj:
                msg = "can't replace a non-existent object '{0}'".format(part)
                raise JsonPatchConflict(msg)
        else:
            if part is None:
                raise TypeError("invalid document type {0}".format(type(subobj)))
            else:
                raise JsonPatchConflict("unable to fully resolve json pointer {0}, part {1}".format(self.location, part))
        subobj[part] = value
        return obj
    def _on_undo_remove(self, path, key):
        return key
    def _on_undo_add(self, path, key):
        return key
class MoveOperation(PatchOperation):
    """Moves an object property or an array element to a new location."""
    def apply(self, obj):
        try:
            if isinstance(self.operation['from'], self.pointer_cls):
                from_ptr = self.operation['from']
            else:
                from_ptr = self.pointer_cls(self.operation['from'])
        except KeyError as ex:
            raise InvalidJsonPatch(
                "The operation does not contain a 'from' member")
        subobj, part = from_ptr.to_last(obj)
        try:
            value = subobj[part]
        except (KeyError, IndexError) as ex:
            raise JsonPatchConflict(str(ex))
        # If source and target are equal, this is a no-op
        if self.pointer == from_ptr:
            return obj
        if isinstance(subobj, MutableMapping) and \
                self.pointer.contains(from_ptr):
            raise JsonPatchConflict('Cannot move values into their own children')
        obj = RemoveOperation({
            'op': 'remove',
            'path': self.operation['from']
        }, pointer_cls=self.pointer_cls).apply(obj)
        obj = AddOperation({
            'op': 'add',
            'path': self.location,
            'value': value
        }, pointer_cls=self.pointer_cls).apply(obj)
        return obj
    @property
    def from_path(self):
        from_ptr = self.pointer_cls(self.operation['from'])
        return '/'.join(from_ptr.parts[:-1])
    @property
    def from_key(self):
        from_ptr = self.pointer_cls(self.operation['from'])
        try:
            return int(from_ptr.parts[-1])
        except TypeError:
            return from_ptr.parts[-1]
    @from_key.setter
    def from_key(self, value):
        from_ptr = self.pointer_cls(self.operation['from'])
        from_ptr.parts[-1] = str(value)
        self.operation['from'] = from_ptr.path
    def _on_undo_remove(self, path, key):
        if self.from_path == path:
            if self.from_key >= key:
                self.from_key += 1
            else:
                key -= 1
        if self.path == path:
            if self.key > key:
                self.key += 1
            else:
                key += 1
        return key
    def _on_undo_add(self, path, key):
        if self.from_path == path:
            if self.from_key > key:
                self.from_key -= 1
            else:
                key -= 1
        if self.path == path:
            if self.key > key:
                self.key -= 1
            else:
                key += 1
        return key
class TestOperation(PatchOperation):
    """Test value by specified location."""
    def apply(self, obj):
        try:
            subobj, part = self.pointer.to_last(obj)
            if part is None:
                val = subobj
            else:
                val = self.pointer.walk(subobj, part)
        except JsonPointerException as ex:
            raise JsonPatchTestFailed(str(ex))
        try:
            value = self.operation['value']
        except KeyError as ex:
            raise InvalidJsonPatch(
                "The operation does not contain a 'value' member")
        if val != value:
            msg = '{0} ({1}) is not equal to tested value {2} ({3})'
            raise JsonPatchTestFailed(msg.format(val, type(val),
                                                 value, type(value)))
        return obj
class CopyOperation(PatchOperation):
    """ Copies an object property or an array element to a new location """
    def apply(self, obj):
        try:
            from_ptr = self.pointer_cls(self.operation['from'])
        except KeyError as ex:
            raise InvalidJsonPatch(
                "The operation does not contain a 'from' member")
        subobj, part = from_ptr.to_last(obj)
        try:
            value = copy.deepcopy(subobj[part])
        except (KeyError, IndexError) as ex:
            raise JsonPatchConflict(str(ex))
        obj = AddOperation({
            'op': 'add',
            'path': self.location,
            'value': value
        }, pointer_cls=self.pointer_cls).apply(obj)
        return obj
class DiffBuilder(object):
    def __init__(self, dumps=json.dumps, pointer_cls=JsonPointer):
        self.dumps = dumps
        self.pointer_cls = pointer_cls
        self.index_storage = [{}, {}]
        self.index_storage2 = [[], []]
        self.__root = root = []
        root[:] = [root, root, None]
    def store_index(self, value, index, st):
        try:
            storage = self.index_storage[st]
            stored = storage.get(value)
            if stored is None:
                storage[value] = [index]
            else:
                storage[value].append(index)
        except TypeError:
            self.index_storage2[st].append((value, index))
    def take_index(self, value, st):
        try:
            stored = self.index_storage[st].get(value)
            if stored:
                return stored.pop()
        except TypeError:
            storage = self.index_storage2[st]
            for i in range(len(storage)-1, -1, -1):
                if storage[i][0] == value:
                    return storage.pop(i)[1]
    def insert(self, op):
        root = self.__root
        last = root[0]
        last[1] = root[0] = [last, root, op]
        return root[0]
    def remove(self, index):
        link_prev, link_next, _ = index
        link_prev[1] = link_next
        link_next[0] = link_prev
        index[:] = []
    def iter_from(self, start):
        root = self.__root
        curr = start[1]
        while curr is not root:
            yield curr[2]
            curr = curr[1]
    def __iter__(self):
        root = self.__root
        curr = root[1]
        while curr is not root:
            yield curr[2]
            curr = curr[1]
    def execute(self):
        root = self.__root
        curr = root[1]
        while curr is not root:
            if curr[1] is not root:
                op_first, op_second = curr[2], curr[1][2]
                if op_first.location == op_second.location and \
                        type(op_first) == RemoveOperation and \
                        type(op_second) == AddOperation:
                    yield ReplaceOperation({
                        'op': 'replace',
                        'path': op_second.location,
                        'value': op_second.operation['value'],
                    }, pointer_cls=self.pointer_cls).operation
                    curr = curr[1][1]
                    continue
            yield curr[2].operation
            curr = curr[1]
    def _item_added(self, path, key, item):
        index = self.take_index(item, _ST_REMOVE)
        if index is not None:
            op = index[2]
            if type(op.key) == int and type(key) == int:
                for v in self.iter_from(index):
                    op.key = v._on_undo_remove(op.path, op.key)
            self.remove(index)
            if op.location != _path_join(path, key):
                new_op = MoveOperation({
                    'op': 'move',
                    'from': op.location,
                    'path': _path_join(path, key),
                }, pointer_cls=self.pointer_cls)
                self.insert(new_op)
        else:
            new_op = AddOperation({
                'op': 'add',
                'path': _path_join(path, key),
                'value': item,
            }, pointer_cls=self.pointer_cls)
            new_index = self.insert(new_op)
            self.store_index(item, new_index, _ST_ADD)
    def _item_removed(self, path, key, item):
        new_op = RemoveOperation({
            'op': 'remove',
            'path': _path_join(path, key),
        }, pointer_cls=self.pointer_cls)
        index = self.take_index(item, _ST_ADD)
        new_index = self.insert(new_op)
        if index is not None:
            op = index[2]
            if type(op.key) == int:
                for v in self.iter_from(index):
                    op.key = v._on_undo_add(op.path, op.key)
            self.remove(index)
            if new_op.location != op.location:
                new_op = MoveOperation({
                    'op': 'move',
                    'from': new_op.location,
                    'path': op.location,
                }, pointer_cls=self.pointer_cls)
                new_index[2] = new_op
            else:
                self.remove(new_index)
        else:
            self.store_index(item, new_index, _ST_REMOVE)
    def _item_replaced(self, path, key, item):
        self.insert(ReplaceOperation({
            'op': 'replace',
            'path': _path_join(path, key),
            'value': item,
        }, pointer_cls=self.pointer_cls))
    def _compare_dicts(self, path, src, dst):
        src_keys = set(src.keys())
        dst_keys = set(dst.keys())
        added_keys = dst_keys - src_keys
        removed_keys = src_keys - dst_keys
        for key in removed_keys:
            self._item_removed(path, str(key), src[key])
        for key in added_keys:
            self._item_added(path, str(key), dst[key])
        for key in src_keys & dst_keys:
            self._compare_values(path, key, src[key], dst[key])
    def _compare_lists(self, path, src, dst):
        len_src, len_dst = len(src), len(dst)
        max_len = max(len_src, len_dst)
        min_len = min(len_src, len_dst)
        for key in range(max_len):
            if key < min_len:
                old, new = src[key], dst[key]
                if old == new:
                    continue
                elif isinstance(old, MutableMapping) and \
                    isinstance(new, MutableMapping):
                    self._compare_dicts(_path_join(path, key), old, new)
                elif isinstance(old, MutableSequence) and \
                        isinstance(new, MutableSequence):
                    self._compare_lists(_path_join(path, key), old, new)
                else:
                    self._item_removed(path, key, old)
                    self._item_added(path, key, new)
            elif len_src > len_dst:
                self._item_removed(path, len_dst, src[key])
            else:
                self._item_added(path, key, dst[key])
    def _compare_values(self, path, key, src, dst):
        if isinstance(src, MutableMapping) and \
                isinstance(dst, MutableMapping):
            self._compare_dicts(_path_join(path, key), src, dst)
        elif isinstance(src, MutableSequence) and \
                isinstance(dst, MutableSequence):
            self._compare_lists(_path_join(path, key), src, dst)
        # To ensure we catch changes to JSON, we can't rely on a simple
        # src == dst, because it would not recognize the difference between
        # 1 and True, among other things. Using json.dumps is the most
        # fool-proof way to ensure we catch type changes that matter to JSON
        # and ignore those that don't. The performance of this could be
        # improved by doing more direct type checks, but we'd need to be
        # careful to accept type changes that don't matter when JSONified.
        elif self.dumps(src) == self.dumps(dst):
            return
        else:
            self._item_replaced(path, key, dst)
def _path_join(path, key):
    if key is None:
        return path
    return path + '/' + str(key).replace('~', '~0').replace('/', '~1')
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