From: Radek Czajka Date: Tue, 26 Aug 2014 22:58:52 +0000 (+0200) Subject: Initial commit. X-Git-Tag: 0.1~5 X-Git-Url: https://git.mdrn.pl/django-ssify.git/commitdiff_plain/3d2c8ba4dfb4774daff367dae1656099eb2b562c?ds=inline Initial commit. --- 3d2c8ba4dfb4774daff367dae1656099eb2b562c diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea2e8e1 --- /dev/null +++ b/.gitignore @@ -0,0 +1,28 @@ +*~ +*.orig +*.log + +# Python garbage +*.pyc +.coverage +pip-log.txt +nosetests.xml +build +dist +*.egg-info + +# Mac OS X garbage +.DS_Store + +# Windows garbage +thumbs.db + +# Eclipse +.project +.settings +.pydevproject +.tmp_* + +# Tags file +TAGS + diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..2def0e8 --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. \ No newline at end of file diff --git a/MANIFEST.in b/MANIFEST.in new file mode 100644 index 0000000..84d37d1 --- /dev/null +++ b/MANIFEST.in @@ -0,0 +1,4 @@ +include LICENSE +include README.md +recursive-include ssify/templates *.html +recursive-include tests/templates *.html diff --git a/README.md b/README.md new file mode 100644 index 0000000..04be2cc --- /dev/null +++ b/README.md @@ -0,0 +1,57 @@ +License +------- + + ![AGPL Logo](http://www.gnu.org/graphics/agplv3-155x51.png) + + Copyright © 2014 Fundacja Nowoczesna Polska + + For full list of contributors see AUTHORS section at the end. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . + + +Dependencies +============ + + * Python >= 2.7 + * Django >= 1.6 + + +Installation +============ + +1. Add 'ssify' to INSTALLES_APPS. +2. Add middleware classes: + * ssify.middleware.SsifyMiddleware on top, + * if using UpdateCacheMiddleware, add + ssify.middleware.PrepareForCacheMiddleware after it, + * ssify.middleware.LocaleMiddleware instead of stock LocaleMiddleware. +3. Make sure you have 'django.core.context_processors.request' in your + TEMPLATE_CONTEXT_PROCESSORS. +3. Define your caches in CACHES and SSIFY_INCLUDES_CACHES + for storing ssi includes. +4. Configure your webserver to use SSI ('ssi=on' with Nginx). + +Usage +===== + +1. Define your included urls using the @ssi_included decorator. +2. Define your ssi variables using the @ssi_variable decorator. + + +Authors +======= + +* Radek Czajka + diff --git a/runtests.py b/runtests.py new file mode 100644 index 0000000..8d27ecf --- /dev/null +++ b/runtests.py @@ -0,0 +1,79 @@ +#!/usr/bin/env python +import sys +import os +from os.path import dirname, abspath +from optparse import OptionParser + +from django.conf import settings, global_settings + +# For convenience configure settings if they are not pre-configured or if we +# haven't been provided settings to use by environment variable. +if not settings.configured and not os.environ.get('DJANGO_SETTINGS_MODULE'): + settings.configure( + CACHES={ + 'default': {'BACKEND': + 'django.core.cache.backends.locmem.LocMemCache'}, + 'ssify': {'BACKEND': + 'django.core.cache.backends.locmem.LocMemCache'}, + }, + DATABASES={ + 'default': { + 'ENGINE': 'django.db.backends.sqlite3', + } + }, + INSTALLED_APPS=[ + 'django.contrib.auth', + 'django.contrib.contenttypes', + 'django.contrib.sessions', + 'django.contrib.sites', + + 'ssify', + 'tests', + ], + MEDIA_URL='/media/', + MIDDLEWARE_CLASSES=[ + 'ssify.middleware.SsiMiddleware', + 'django.middleware.cache.UpdateCacheMiddleware', + 'ssify.middleware.PrepareForCacheMiddleware', + 'django.middleware.common.CommonMiddleware', + 'django.middleware.cache.FetchFromCacheMiddleware', + ], + STATIC_URL='/static/', + ROOT_URLCONF='tests.urls', + SITE_ID=1, + SSIFY_DEBUG_VERBOSE=False, + TEMPLATE_CONTEXT_PROCESSORS=( + "django.core.context_processors.debug", + "django.core.context_processors.i18n", + "django.core.context_processors.tz", + "django.core.context_processors.request", + ), + ) + +from django.test.simple import DjangoTestSuiteRunner + + +def runtests(*test_args, **kwargs): + if 'south' in settings.INSTALLED_APPS: + from south.management.commands import patch_for_test_db_setup + patch_for_test_db_setup() + + if not test_args: + test_args = ['tests'] + parent = dirname(abspath(__file__)) + sys.path.insert(0, parent) + test_runner = DjangoTestSuiteRunner( + verbosity=kwargs.get('verbosity', 1), + interactive=kwargs.get('interactive', False), + failfast=kwargs.get('failfast')) + failures = test_runner.run_tests(test_args) + sys.exit(failures) + +if __name__ == '__main__': + parser = OptionParser() + parser.add_option('--failfast', action='store_true', + default=False, dest='failfast') + + (options, args) = parser.parse_args() + + runtests(failfast=options.failfast, *args) diff --git a/setup.py b/setup.py new file mode 100755 index 0000000..d549279 --- /dev/null +++ b/setup.py @@ -0,0 +1,28 @@ +#!/usr/bin/env python +# -*- coding: utf-8 -*- +# +from setuptools import setup, find_packages + +setup( + name='django-ssify', + version='0.1', + author='Radek Czajka', + author_email='radekczajka@nowoczesnapolska.org.pl', + url='', + packages=find_packages(exclude=['tests*']), + license='LICENSE', + description='Two-phased rendering using SSI.', + long_description=open('README.md').read(), + test_suite="runtests.runtests", + classifiers=[ + "Development Status :: 3 - Alpha", + "Environment :: Web Environment", + "Framework :: Django", + "Intended Audience :: Developers", + "Intended Audience :: System Administrators", + "License :: OSI Approved :: GNU Affero General Public License v3", + "Programming Language :: Python", + "Topic :: Internet :: WWW/HTTP", + "Topic :: Software Development :: Code Generators", + ] +) diff --git a/ssify/__init__.py b/ssify/__init__.py new file mode 100644 index 0000000..591c70a --- /dev/null +++ b/ssify/__init__.py @@ -0,0 +1,29 @@ +""" +Implements two-phase rendering using SSI statements. + +Define reqest-dependent SSI variables to use as template tags +with `ssi_variable` decorator. + +Define views to be cached and included as SSI include +with `ssi_included` decorator. + +""" + +__version__ = '1.0' +__date__ = '2014-08-26' +__all__ = ('ssi_expect', 'SsiVariable', 'ssi_included', 'ssi_variable') + +from django.conf import settings +from django.utils.functional import lazy + +SETTING = lazy( + lambda name, default: getattr(settings, name, default), + bool, int, list, tuple, unicode) + +INCLUDES_CACHES = SETTING('SSIFY_INCLUDES_CACHES', ('ssify',)) +DEBUG = SETTING('SSIFY_DEBUG', False) +DEBUG_VERBOSE = SETTING('SSIFY_DEBUG_VERBOSE', True) + + +from .variables import ssi_expect, SsiVariable +from .decorators import ssi_included, ssi_variable diff --git a/ssify/cache.py b/ssify/cache.py new file mode 100644 index 0000000..7f42145 --- /dev/null +++ b/ssify/cache.py @@ -0,0 +1,46 @@ +import os +from django.core.cache.backends.filebased import FileBasedCache + + +class StaticFileBasedCache(FileBasedCache): + def __init__(self, *args, **kwargs): + super(StaticFileBasedCache, self).__init__(*args, **kwargs) + self._dir = os.path.abspath(self._dir) + + def make_key(self, key, version=None): + assert version is None, \ + 'StaticFileBasedCache does not support versioning.' + return key + + def _key_to_file(self, key): + key = os.path.abspath(os.path.join(self._dir, key.lstrip('/'))) + assert key.startswith(self._dir), 'Trying to save path outside root.' + if key.endswith('/'): + key += 'index.html' + return key + + def get(self, key, default=None, version=None): + key = self.make_key(key, version=version) + self.validate_key(key) + fname = self._key_to_file(key) + try: + with open(fname, 'rb') as inf: + return inf.read() + except (IOError, OSError): + pass + return default + + def set(self, key, value, timeout=None, version=None): + assert timeout is None, \ + 'StaticFileBasedCache does not support timeouts.' + key = self.make_key(key, version=version) + self.validate_key(key) + fname = self._key_to_file(key) + dirname = os.path.dirname(fname) + try: + if not os.path.exists(dirname): + os.makedirs(dirname) + with open(fname, 'wb') as outf: + outf.write(value) + except (IOError, OSError): + pass diff --git a/ssify/decorators.py b/ssify/decorators.py new file mode 100644 index 0000000..9b67c25 --- /dev/null +++ b/ssify/decorators.py @@ -0,0 +1,132 @@ +import functools +from inspect import getargspec +import warnings +from django.template.base import parse_bits +from django.utils.translation import get_language, activate +from .store import cache_include +from . import exceptions +from .variables import SsiVariable + + +def ssi_included(view=None, use_lang=True, get_ssi_vars=None): + """ + Marks a view to be used as a snippet to be included with SSI. + + If use_lang is True (which is default), the URL pattern for such + a view must provide a keyword argument named 'lang' for language. + SSI included views don't use language or content negotiation, so + everything they need to know has to be included in the URL. + + get_ssi_vars should be a callable which takes the view's arguments + and returns the names of SSI variables it uses. + + """ + def dec(view): + @functools.wraps(view) + def new_view(request, *args, **kwargs): + if use_lang: + try: + lang = kwargs.pop('lang') + except KeyError: + raise exceptions.NoLangFieldError(request) + current_lang = get_language() + activate(lang) + response = view(request, *args, **kwargs) + if use_lang: + activate(current_lang) + if response.status_code == 200: + request._cache_update_cache = False + + def _check_included_vars(response): + used_vars = request.ssi_vars_needed + if get_ssi_vars: + # Remove the ssi vars that should be provided + # by the including view. + pass_vars = set(get_ssi_vars(*args, **kwargs)) + + for var in pass_vars: + if not isinstance(var, SsiVariable): + var = SsiVariable(*var) + try: + del used_vars[var.name] + except KeyError: + warnings.warn( + exceptions.UnusedSsiVarsWarning( + request, var)) + if used_vars: + raise exceptions.UndeclaredSsiVarsError( + request, used_vars) + request.ssi_vars_needed = {} + + # Don't use default django response caching for this view, + # just save the contents instead. + cache_include(request.path, response.content) + + if hasattr(response, 'render') and callable(response.render): + response.add_post_render_callback(_check_included_vars) + else: + _check_included_vars(response) + + return response + + # Remember get_ssi_vars so that in can be computed from args/kwargs + # by including view. + new_view.get_ssi_vars = get_ssi_vars + return new_view + return dec(view) if view else dec + + +def ssi_variable(register, vary=None, name=None): + # Cache control? + def dec(func): + # Find own path. + function_name = (name or + getattr(func, '_decorated_function', func).__name__) + lib_name = func.__module__.rsplit('.', 1)[-1] + tagpath = "%s.%s" % (lib_name, function_name) + # Make sure the function takes request parameter. + params, varargs, varkw, defaults = getargspec(func) + assert params and params[0] == 'request', '%s is decorated with '\ + 'request_info_tag, so it must take `request` for '\ + 'its first argument.' % (tagpath) + + @register.tag(name=function_name) + def _ssi_var_tag(parser, token): + """ + Creates a SSI variable reference for a request-dependent info. + + Use as: + {% ri_tag args... %} + or: + {% ri_tag args... as variable %} + {{ variable.if }} + {{ variable }}, or + {% ssi_include 'some-snippet' variable %} + {{ variable.else }} + Default text + {{ variable.endif }} + + """ + bits = token.split_contents()[1:] + + # Is it the 'as' form? + if len(bits) >= 2 and bits[-2] == 'as': + asvar = bits[-1] + bits = bits[:-2] + else: + asvar = None + + # Parse the arguments like Django's generic tags do. + args, kwargs = parse_bits(parser, bits, + ['context'] + params[1:], varargs, varkw, + defaults, takes_context=True, + name=function_name) + return SsiVariableNode(tagpath, args, kwargs, vary, asvar) + _ssi_var_tag.get_value = func + #return _ssi_var_tag + return func + + return dec + + +from .variables import SsiVariableNode diff --git a/ssify/exceptions.py b/ssify/exceptions.py new file mode 100644 index 0000000..8acc55c --- /dev/null +++ b/ssify/exceptions.py @@ -0,0 +1,68 @@ +class SsifyError(BaseException): + pass + + +class SsifyWarning(Warning): + pass + + +class UndeclaredSsiVarsError(SsifyError): + def __init__(self, request, ssi_vars): + super(UndeclaredSsiVarsError, self).__init__(request, ssi_vars) + + def __str__(self): + request = self.args[0] + view = request.resolver_match.func + return "The view '%s.%s' at '%s' is marked as `ssi_included`, "\ + "but it uses ssi variables not declared in `get_ssi_vars` "\ + "argument: %s. " % ( + view.__module__, view.__name__, request.path, + repr(self.args[1])) + + +class UnusedSsiVarsWarning(SsifyWarning): + def __init__(self, request, ssi_vars): + super(UnusedSsiVarsWarning, self).__init__(request, ssi_vars) + + def __str__(self): + request = self.args[0] + view = request.resolver_match.func + return "The `ssi_included` view '%s.%s' at '%s' declares "\ + "using SSI variables %s but it looks like they're not "\ + "really used. " % ( + view.__module__, view.__name__, request.path, self.args[1]) + + +class UndeclaredSsiRefError(SsifyError): + def __init__(self, request, var, ref_name): + super(UndeclaredSsiRefError, self).__init__(request, var, ref_name) + + def __str__(self): + request = self.args[0] + view = request.resolver_match.func + return "Error while rendering ssi_included view '%s.%s' at '%s': "\ + "SSI variable %s references variable %s, which doesn't match "\ + "any variable declared in `get_ssi_vars`. " % ( + view.__module__, view.__name__, request.path, + repr(self.args[1]), self.args[2]) + + +class NoLangFieldError(SsifyError): + def __init__(self, request): + super(NoLangFieldError, self).__init__(request) + + def __str__(self): + request = self.args[0] + view = request.resolver_match.func + return "The view '%s.%s' at '%s' is marked as `ssi_included` "\ + "with use_lang=True, but its URL match doesn't provide "\ + "a 'lang' keyword argument for language. " % ( + view.__module__, view.__name__, request.path) + + +class SsiVarsDependencyCycleError(SsifyError): + def __init__(self, ssi_vars): + super(SsiVarsDependencyCycleError, self).__init__(ssi_vars) + + def __str__(self): + return "Dependency cycle in SSI variables: %s." % self.args[0] diff --git a/ssify/management/__init__.py b/ssify/management/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/ssify/management/commands/__init__.py b/ssify/management/commands/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/ssify/management/commands/ssify_nginx_conf.py b/ssify/management/commands/ssify_nginx_conf.py new file mode 100644 index 0000000..48f53dc --- /dev/null +++ b/ssify/management/commands/ssify_nginx_conf.py @@ -0,0 +1,15 @@ +# -*- coding: utf-8 -*- +# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later. +# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information. +# +from optparse import make_option +from django.core.management.base import BaseCommand + + +class Command(BaseCommand): + option_list = BaseCommand.option_list + ( + ) + help = 'Dumps configuration for NGINX.' + + def handle(self, **options): + pass diff --git a/ssify/middleware.py b/ssify/middleware.py new file mode 100644 index 0000000..4351083 --- /dev/null +++ b/ssify/middleware.py @@ -0,0 +1,106 @@ +from django.conf import settings +from django.utils.cache import patch_vary_headers +from django.middleware import locale +from .serializers import json_decode, json_encode +from .variables import SsiVariable, provide_vars +from . import DEBUG + + +class PrepareForCacheMiddleware(object): + @staticmethod + def process_response(request, response): + if getattr(request, 'ssi_vars_needed', None): + vars_needed = {k: v.definition + for (k, v) in request.ssi_vars_needed.items()} + response['X-Ssi-Vars-Needed'] = json_encode( + vars_needed, sort_keys=True) + return response + + +class SsiMiddleware(object): + def process_request(self, request): + request.ssi_vary = set() + #request.ssi_cache_control_after = set() + + def process_view(self, request, view_func, view_args, view_kwargs): + request.ssi_vars_needed = {} + + def _process_rendered_response(self, request, response): + # Prepend the SSI variables. + if hasattr(request, 'ssi_vars_needed'): + vars_needed = request.ssi_vars_needed + else: + vars_needed = json_decode(response.get('X-Ssi-Vars-Needed', '{}')) + vars_needed = {k: SsiVariable(*v) + for (k, v) in vars_needed.items()} + + if vars_needed: + response.content = provide_vars(request, vars_needed) + \ + response.content + + # Add the Vary headers declared by all the SSI vars. + patch_vary_headers(response, sorted(request.ssi_vary)) + # TODO: cache control? + + # With a cached response, CsrfViewMiddleware.process_response + # was never called, so if we used the csrf token, we must do + # its job of setting the csrf token cookie on our own. + if (not getattr(request, 'csrf_processing_done', False) + and request.META.get("CSRF_COOKIE_USED", False)): + response.set_cookie(settings.CSRF_COOKIE_NAME, + request.META["CSRF_COOKIE"], + max_age=getattr(settings, 'CSRF_COOKIE_AGE', + 60 * 60 * 24 * 7 * 52), + domain=settings.CSRF_COOKIE_DOMAIN, + path=settings.CSRF_COOKIE_PATH, + secure=settings.CSRF_COOKIE_SECURE, + httponly=settings.CSRF_COOKIE_HTTPONLY + ) + request.csrf_processing_done = True + + def process_response(self, request, response): + if hasattr(response, 'render') and callable(response.render): + response.add_post_render_callback( + lambda r: self._process_rendered_response(request, r) + ) + else: + self._process_rendered_response(request, response) + + if DEBUG: + from .middleware_debug import DebugUnSsiMiddleware + response = DebugUnSsiMiddleware().process_response( + request, response) + + return response + + +class LocaleMiddleware(locale.LocaleMiddleware): + """ + Version of the LocaleMiddleware for use together with the + SsiMiddleware if USE_I18N or USE_L10N is set. + + Stock LocaleMiddleware looks for user language selection in + the session data and cookies, before it falls back to parsing + Accept-Language. The effect of accessing the session is adding + the `Vary: Cookie` header to the response. While this is correct + behaviour, it renders the cache system useless (see + https://code.djangoproject.com/ticket/13217). + + This version of LocaleMiddleware doesn't mark the session + as accessed on every request, so SessionMiddleware doesn't add the + Vary: Cookie header (unless something else actually uses the session + in a meaningful way, of course). Instead, it tells SsiMiddleware + to add the Vary: Cookie header to the final response. + + """ + def process_request(self, request): + if hasattr(request, 'session'): + session_accessed_before = request.session.accessed + else: + session_accessed_before = None + super(LocaleMiddleware, self).process_request(request) + if session_accessed_before is False: + if (request.session.accessed and + (settings.USE_I18N or settings.USE_L10N)): + request.session.accessed = False + request.ssi_vary.add('Cookie') diff --git a/ssify/middleware_debug.py b/ssify/middleware_debug.py new file mode 100644 index 0000000..2bd4fa0 --- /dev/null +++ b/ssify/middleware_debug.py @@ -0,0 +1,125 @@ +""" +This module should only be used for debugging SSI statements. + +Using DebugUnSsiMiddleware in production defeats the purpose of using SSI +in the first place, and is unsafe. You should use a proper webserver with SSI +support as a proxy (i.e. Nginx with ssi=on). + +""" +import re +import urlparse +from django.core.urlresolvers import resolve +from ssify import DEBUG_VERBOSE + + +SSI_SET = re.compile(r"", re.S) +SSI_ECHO = re.compile(r"") +SSI_INCLUDE = re.compile(r"") +SSI_IF = re.compile(r"(?P
)" + r"(?P.*?)(?:(?P.*?))?" + r"", re.S) + # TODO: escaped? +SSI_VAR = re.compile(r"\$\{(?P.+)\}") # TODO: escaped? + + +class DebugUnSsiMiddleware(object): + """ + Emulates a webserver with SSI support. + + This middleware should only be used for debugging purposes. + SsiMiddleware will enable it automatically, if SSIFY_DEBUG setting + is set to True, so you don't normally need to include it in + MIDDLEWARE_CLASSES. + + If SSIFY_DEBUG_VERBOSE setting is True, it will also leave some + information in HTML comments. + + """ + @staticmethod + def _process_rendered_response(request, response): + """Recursively process SSI statements in the response.""" + def ssi_include(match): + """Replaces SSI include with contents rendered by relevant view.""" + path = process_value(match.group('path')) + func, args, kwargs = resolve(path) + parsed = urlparse.urlparse(path) + request.META['PATH_INFO'] = request.path_info = \ + request.path = parsed.path + request.META['QUERY_STRING'] = parsed.query + content = func(request, *args, **kwargs).content + content = process_content(content) + if DEBUG_VERBOSE: + return "".join(( + match.group(0), + content, + match.group(0).replace('" % url + + +@ssi_variable(register, vary=('Cookie',)) +def get_csrf_token(request): + """ + As CsrfViewMiddleware.process_view is never for a cached response, + and we still need to provide a request-specific CSRF token as + request-info ssi variable, we must make sure here that the + CSRF token is in request.META['CSRF_COOKIE']. + + """ + token = get_token(request) + if token: + # CSRF token is already in place, just return it. + return token + + # Mimicking CsrfViewMiddleware.process_view. + try: + token = _sanitize_token(request.COOKIES[settings.CSRF_COOKIE_NAME]) + request.META['CSRF_COOKIE'] = token + except KeyError: + # Create new CSRF token. + rotate_token(request) + token = get_token(request) + + return token + + +@register.inclusion_tag('ssify/csrf_token.html', takes_context=True) +def csrf_token(context): + return {'request': context['request']} diff --git a/ssify/variables.py b/ssify/variables.py new file mode 100644 index 0000000..9ccc3f3 --- /dev/null +++ b/ssify/variables.py @@ -0,0 +1,214 @@ +""" +Utilities for defining SSI variables. + +SSI variables are a way of providing values that need to be computed +at request time to the prerendered templates. + +""" +from hashlib import md5 +from django import template +from django.utils.encoding import force_unicode +from django.utils.functional import Promise +from django.utils.safestring import mark_safe +from .exceptions import SsiVarsDependencyCycleError, UndeclaredSsiRefError + + +class SsiVariable(object): + """ + Represents a variable computed by a template tag with given arguments. + + Instance of this class is returned from any template tag created + with `decorators.ssi_variable` decorator. If renders as SSI echo + statement, but you can also use it as an argument to {% ssi_include %}, + to other ssi_variable, or create SSI if statements by using + its `if`, `else`, `endif` properties. + + Variable's name, as used in SSI statements, is a hash of its definition, + so the user never has to deal with it directly. + + """ + ret_types = 'bool', 'int', 'unicode' + + def __init__(self, tagpath=None, args=None, kwargs=None, name=None): + self.tagpath = tagpath + self.args = list(args or []) + self.kwargs = kwargs or {} + self._name = name + + @property + def name(self): + """Variable name is a hash of its definition.""" + if self._name is None: + self._name = 'v' + md5(json_encode(self.definition)).hexdigest() + return self._name + + def rehash(self): + """ + Sometimes there's a need to reset the variable name. + + Typically, this is the case after finding real values for + variables passed as arguments to {% ssi_include %}. + """ + self._name = None + return self.name + + @property + def definition(self): + """Variable is defined by path to template tag and its arguments.""" + if self.kwargs: + return self.tagpath, self.args, self.kwargs + elif self.args: + return self.tagpath, self.args + else: + return self.tagpath, + + def __repr__(self): + return "SsiVariable(%s: %s)" % (self.name, repr(self.definition)) + + def get_value(self, request): + """Computes the real value of the variable, using the request.""" + taglib, tagname = self.tagpath.rsplit('.', 1) + return template.get_library(taglib).tags[tagname].get_value( + request, *self.args, **self.kwargs) + + def __unicode__(self): + return mark_safe("" % self.name) + + def as_var(self): + """Returns the form that can be used in SSI include's URL.""" + return '${%s}' % self.name + +# If-else-endif properties for use in templates. +setattr(SsiVariable, 'if', + lambda self: mark_safe("" % self.name)) +setattr(SsiVariable, 'else', + staticmethod(lambda: mark_safe(""))) +setattr(SsiVariable, 'endif', + staticmethod(lambda: mark_safe(''))) + + +class SsiExpect(object): + """This class says: I want the real value of this variable here.""" + def __init__(self, name): + self.name = name + + +def ssi_expect(var, type_): + """ + Helper function for defining get_ssi_vars on ssi_included views. + + The view needs a way of calculating all the needed variables from + the view args. But the args are probably the wrong type + (typically, str instead of int) or even are SsiVariables, not + resolved until request time. + + This function provides a way to expect a real value of the needed type. + + """ + if isinstance(var, SsiVariable): + return SsiExpect(var.name) + else: + return type_(var) + + +class SsiVariableNode(template.Node): + """ Node for the SsiVariable tags. """ + def __init__(self, tagpath, args, kwargs, vary=None, asvar=None): + self.tagpath = tagpath + self.args = args + self.kwargs = kwargs + self.vary = vary + self.asvar = asvar + + def __repr__(self): + return "" + + def render(self, context): + """Renders the tag as SSI echo or sets the context variable.""" + resolved_args = [var.resolve(context) for var in self.args] + resolved_kwargs = dict((k, v.resolve(context)) + for k, v in self.kwargs.items()) + var = SsiVariable(self.tagpath, resolved_args, resolved_kwargs) + + request = context['request'] + request.ssi_vars_needed[var.name] = var + if self.vary: + request.ssi_vary.update(self.vary) + + if self.asvar: + context.dicts[0][self.asvar] = var + return '' + else: + return var + + +def ssi_set_statement(var, value): + """Generates an SSI set statement for a variable.""" + if isinstance(value, Promise): + # Yes, this is quite brutal. But we need to know + # the real value now, we don't know the type, + # and we only want to evaluate the lazy function once. + value = value._proxy____cast() + if value is False or value is None: + value = '' + return "" % ( + var, + force_unicode(value).replace(u'\\', u'\\\\').replace(u"'", u"\\'")) + + +def provide_vars(request, ssi_vars): + """ + Provides all the SSI set statements for ssi_vars variables. + + The main purpose of this function is to by called by SsifyMiddleware. + """ + resolved = {} + queue = ssi_vars.items() + unresolved_streak = 0 + while queue: + var_name, var = queue.pop(0) + hash_dirty = False + new_name = var_name + + try: + for i, arg in enumerate(var.args): + if isinstance(arg, SsiExpect): + var.args[i] = resolved[arg.name] + hash_dirty = True + for k, arg in var.kwargs.items(): + if isinstance(arg, SsiExpect): + var.args[k] = resolved[arg.name] + hash_dirty = True + + if hash_dirty: + # Rehash after calculating the SsiExpects with real + # values, because that's what the included views expect. + new_name = var.rehash() + + for i, arg in enumerate(var.args): + if isinstance(arg, SsiVariable): + var.args[i] = resolved[arg.name] + for k, arg in var.kwargs.items(): + if isinstance(arg, SsiVariable): + var.args[k] = resolved[arg.name] + + except KeyError: + queue.append((var_name, var)) + unresolved_streak += 1 + if unresolved_streak == len(queue): + if arg.name in ssi_vars: + raise SsiVarsDependencyCycleError(queue) + else: + raise UndeclaredSsiRefError(request, var, arg.name) + continue + + resolved[new_name] = var.get_value(request) + unresolved_streak = 0 + + output = u"".join(ssi_set_statement(var, value) + for (var, value) in resolved.items() + ).encode('utf-8') + return output + + +from .serializers import json_encode diff --git a/tests/__init__.py b/tests/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/tests/models.py b/tests/models.py new file mode 100644 index 0000000..e69de29 diff --git a/tests/templates/tests/main.html b/tests/templates/tests/main.html new file mode 100644 index 0000000..fb5eff3 --- /dev/null +++ b/tests/templates/tests/main.html @@ -0,0 +1,3 @@ +{% load ssify %} + +{% ssi_include 'random_quote' %} \ No newline at end of file diff --git a/tests/templates/tests/number_zero.html b/tests/templates/tests/number_zero.html new file mode 100644 index 0000000..a01b50f --- /dev/null +++ b/tests/templates/tests/number_zero.html @@ -0,0 +1 @@ +{% load test_tags %}{% random_number 1 %} \ No newline at end of file diff --git a/tests/templates/tests/quote.html b/tests/templates/tests/quote.html new file mode 100644 index 0000000..6ddabd3 --- /dev/null +++ b/tests/templates/tests/quote.html @@ -0,0 +1,7 @@ +{% load test_tags %} +{% quote_len_odd number as odd %} +{{ quote }} +Line {{ number }} of {% number_of_quotes %} +{{ odd.if }}Odd number of characters. +{{ odd.else }}Even number of characters. +{{ odd.endif }} diff --git a/tests/templates/tests/random_quote.html b/tests/templates/tests/random_quote.html new file mode 100644 index 0000000..66611aa --- /dev/null +++ b/tests/templates/tests/random_quote.html @@ -0,0 +1,4 @@ +{% load ssify test_tags %} +{% number_of_quotes as qlen %} +{% random_number qlen as number %} +{% ssi_include 'quote' number=number %} \ No newline at end of file diff --git a/tests/templatetags/__init__.py b/tests/templatetags/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/tests/templatetags/test_tags.py b/tests/templatetags/test_tags.py new file mode 100644 index 0000000..8c9dfea --- /dev/null +++ b/tests/templatetags/test_tags.py @@ -0,0 +1,21 @@ +from django import template +from ssify import ssi_variable +from tests.views import QUOTES + +register = template.Library() + + +@ssi_variable(register) +def random_number(request, limit): + # Guaranteed to be random as of XKCD#221 + return min(limit - 1, 4) + + +@ssi_variable(register) +def number_of_quotes(request): + return len(QUOTES) + + +@ssi_variable(register) +def quote_len_odd(request, which): + return bool(len(QUOTES[which]) % 1) diff --git a/tests/tests.py b/tests/tests.py new file mode 100644 index 0000000..82751c7 --- /dev/null +++ b/tests/tests.py @@ -0,0 +1,61 @@ +from django.test import Client, TestCase +from django.test.utils import override_settings + + +class SsifyTestCase(TestCase): + def setUp(self): + self.client = Client() + + def test_zero(self): + self.assertEqual( + self.client.get('/number_zero').content, + "" + "" + ) + + def test_single_quote(self): + self.assertEqual( + self.client.get('/quote/3').content.strip(), + """Explicit is better than implicit. +Line 3 of +Odd number of characters. +Even number of characters. +""" + ) + + def test_random_quote(self): + self.assertEqual( + self.client.get('/').content.strip(), + "" + "" + "" + "\n\n" + ) + + # Do it again, this time from cache. + self.assertEqual( + self.client.get('/').content.strip(), + "" + "" + "" + "\n\n" + ) + self.assertEqual( + self.client.get('/random_quote').content.strip(), + "" + ) + + @override_settings(SSIFY_DEBUG=True) + def test_debug_render_random_quote(self): + """Renders the complete view using the DebugSsiMiddleware.""" + response = self.client.get('/') + if hasattr(response, 'render') and callable(response.render): + response.render() + self.assertEqual( + response.content.strip(), + """Simple is better than complex. +Line 4 of 22 +Even number of characters.""" + ) diff --git a/tests/urls.py b/tests/urls.py new file mode 100644 index 0000000..53c0ef7 --- /dev/null +++ b/tests/urls.py @@ -0,0 +1,16 @@ +from django.conf.urls import patterns, url +from django.views.generic import TemplateView + + +urlpatterns = patterns( + 'tests.views', + + url(r'^$', + TemplateView.as_view(template_name='tests/main.html') + ), + url(r'^number_zero$', + TemplateView.as_view(template_name='tests/number_zero.html') + ), + url(r'^random_quote$', 'random_quote', name='random_quote'), + url(r'^quote/(?P.+)$', 'quote', name='quote'), +) diff --git a/tests/views.py b/tests/views.py new file mode 100644 index 0000000..4c6fa90 --- /dev/null +++ b/tests/views.py @@ -0,0 +1,46 @@ +from django.shortcuts import render +from ssify import ssi_included, ssi_expect, SsiVariable as V + + +@ssi_included(use_lang=False, get_ssi_vars=lambda number: [ + ('test_tags.number_of_quotes',), + ('test_tags.quote_len_odd', (ssi_expect(number, int),)) +]) +def quote(request, number): + number = int(number) + return render(request, 'tests/quote.html', { + 'number': number, + 'quote': QUOTES[number] + }) + + +@ssi_included(use_lang=False, get_ssi_vars=lambda: ( + lambda number: [number] + quote.get_ssi_vars(number))( + number=V('test_tags.random_number', [V('test_tags.number_of_quotes')]) + )) +def random_quote(request): + """ + This view is purposely overcomplicated to test interdependencies + between SSI variables and SSI includes. + + It finds number of quotes and sets that in an SSI variable, + then uses that to set a random quote number in a second variable, + then sets a third saying if the length of the selected quote is odd. + + """ + return render(request, 'tests/random_quote.html') + + +# Nothing interesting here. +def _quotes(): + import sys + import cStringIO + stdout_backup = sys.stdout + sys.stdout = cStringIO.StringIO() + import this + this_string = sys.stdout.getvalue() + sys.stdout.close() + sys.stdout = stdout_backup + return this_string.split('\n') + +QUOTES = _quotes()