mirror of https://gitlab.com/octtspacc/staticoso
93 lines
4.0 KiB
Python
93 lines
4.0 KiB
Python
"""
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Copyright (c) 2013, Dave Mankoff
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Dave Mankoff nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL DAVE MANKOFF BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""
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from .main import Minifier
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class HTMLMinMiddleware(object):
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"""WSGI Middleware that minifies html on the way out.
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:param by_default: Specifies if minification should be turned on or off by
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default. Defaults to ``True``.
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:param keep_header: The middleware recognizes one custom HTTP header that
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can be used to turn minification on or off on a per-request basis:
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``X-HTML-Min-Enable``. Setting the header to ``true`` will turn minfication
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on; anything else will turn minification off. If ``by_default`` is set to
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``False``, this header is how you would turn minification back on. The
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middleware, by default, removes the header from the output. Setting this
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to ``True`` leaves the header in tact.
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:param debug: A quick setting to turn all minification off. The middleware
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is effectively bypassed.
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This simple middleware minifies any HTML content that passes through it. Any
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additional keyword arguments beyond the three settings the middleware has are
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passed on to the internal minifier. The documentation for the options can
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be found under :class:`htmlmin.minify`.
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"""
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def __init__(self, app, by_default=True, keep_header=False,
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debug=False, **kwargs):
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self.app = app
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self.by_default = by_default
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self.debug = debug
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self.keep_header = keep_header
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self.minifier = Minifier(**kwargs)
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def __call__(self, environ, start_response):
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if self.debug:
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return self.app(environ, start_response)
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should_minify = [] # need to use a mutable object so we can change it
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# in a different scope.
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def minified_start_response(status, headers, exc_info=None):
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should_minify.append(self.should_minify(headers))
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if not self.keep_header:
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headers = [(header, value) for header, value in
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headers if header != 'X-HTML-Min-Enable']
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start_response(status, headers, exc_info)
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html = [i for i in self.app(environ, minified_start_response)]
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if should_minify[0]:
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return [self.minifier.minify(*html)]
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return html
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def should_minify(self, headers):
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is_html = False
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flag_header = None
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for header, value in headers:
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if not is_html and header == 'Content-Type' and value == 'text/html':
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is_html = True
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if flag_header is not None:
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break
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if flag_header is None and header == 'X-HTML-Min-Enable':
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flag_header = (value.lower() == 'true')
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if is_html:
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break
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return is_html and (
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(self.by_default and flag_header != False) or
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(not self.by_default and flag_header))
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