fd2c15bef3
Fixes base_template.load and remove_template_definition which fail when the userdata is empty / None or when the userdata has only one line. Change-Id: I2ba0e16489049be390b2c9bc1fdf1e1059f54eb1
71 lines
2.3 KiB
Python
71 lines
2.3 KiB
Python
# Copyright 2019 Cloudbase Solutions Srl
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import abc
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import re
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import six
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@six.add_metaclass(abc.ABCMeta)
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class BaseTemplateEngine(object):
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def __init__(self):
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self._template_matcher = re.compile(r"##\s*template:(.*)", re.I)
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@abc.abstractmethod
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def get_template_type(self):
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"""Return the template type for the class loader"""
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pass
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@abc.abstractmethod
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def render(self, data, template):
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"""Renders the template according to the data dictionary
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The data variable is a dict which contains the key-values
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that will be used to render the template.
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The template is an encoded string which can contain special
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constructions that will be used by the template engine.
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The return value will be an encoded string.
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"""
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def load(self, data):
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"""Returns True if the template header matches, False otherwise"""
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if not data:
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return
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template_type_matcher = self._template_matcher.match(data.decode())
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if not template_type_matcher:
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return
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template_type = template_type_matcher.group(1).lower().strip()
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if self.get_template_type() == template_type:
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return True
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@staticmethod
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def remove_template_definition(raw_template):
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# return the raw template as is if it is None or empty array / dict
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if not raw_template:
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return raw_template
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# Remove the first line, as it contains the template definition
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template_split = raw_template.split(b"\n", 1)
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if len(template_split) == 2:
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# return the template without the header
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return template_split[1]
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# the template has just one line, return empty encoded string
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return b''
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