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149 lines
4.8 KiB
Python
149 lines
4.8 KiB
Python
from urllib.parse import quote
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from django.http import (
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HttpResponseBadRequest, HttpResponseForbidden, HttpResponseNotFound,
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HttpResponseServerError,
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)
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from django.template import Context, Engine, TemplateDoesNotExist, loader
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from django.views.decorators.csrf import requires_csrf_token
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ERROR_404_TEMPLATE_NAME = '404.html'
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ERROR_403_TEMPLATE_NAME = '403.html'
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ERROR_400_TEMPLATE_NAME = '400.html'
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ERROR_500_TEMPLATE_NAME = '500.html'
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ERROR_PAGE_TEMPLATE = """
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<!doctype html>
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<html lang="en">
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<head>
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<title>%(title)s</title>
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</head>
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<body>
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<h1>%(title)s</h1><p>%(details)s</p>
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</body>
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</html>
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"""
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# This can be called when CsrfViewMiddleware.process_view has not run,
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# therefore need @requires_csrf_token in case the template needs
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# {% csrf_token %}.
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@requires_csrf_token
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def page_not_found(request, exception, template_name=ERROR_404_TEMPLATE_NAME):
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"""
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Default 404 handler.
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Templates: :template:`404.html`
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Context:
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request_path
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The path of the requested URL (e.g., '/app/pages/bad_page/'). It's
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quoted to prevent a content injection attack.
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exception
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The message from the exception which triggered the 404 (if one was
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supplied), or the exception class name
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"""
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exception_repr = exception.__class__.__name__
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# Try to get an "interesting" exception message, if any (and not the ugly
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# Resolver404 dictionary)
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try:
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message = exception.args[0]
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except (AttributeError, IndexError):
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pass
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else:
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if isinstance(message, str):
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exception_repr = message
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context = {
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'request_path': quote(request.path),
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'exception': exception_repr,
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}
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try:
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template = loader.get_template(template_name)
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body = template.render(context, request)
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content_type = None # Django will use 'text/html'.
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except TemplateDoesNotExist:
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if template_name != ERROR_404_TEMPLATE_NAME:
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# Reraise if it's a missing custom template.
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raise
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# Render template (even though there are no substitutions) to allow
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# inspecting the context in tests.
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template = Engine().from_string(
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ERROR_PAGE_TEMPLATE % {
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'title': 'Not Found',
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'details': 'The requested resource was not found on this server.',
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},
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)
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body = template.render(Context(context))
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content_type = 'text/html'
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return HttpResponseNotFound(body, content_type=content_type)
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@requires_csrf_token
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def server_error(request, template_name=ERROR_500_TEMPLATE_NAME):
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"""
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500 error handler.
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Templates: :template:`500.html`
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Context: None
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"""
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try:
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template = loader.get_template(template_name)
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except TemplateDoesNotExist:
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if template_name != ERROR_500_TEMPLATE_NAME:
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# Reraise if it's a missing custom template.
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raise
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return HttpResponseServerError(
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ERROR_PAGE_TEMPLATE % {'title': 'Server Error (500)', 'details': ''},
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content_type='text/html',
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)
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return HttpResponseServerError(template.render())
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@requires_csrf_token
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def bad_request(request, exception, template_name=ERROR_400_TEMPLATE_NAME):
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"""
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400 error handler.
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Templates: :template:`400.html`
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Context: None
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"""
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try:
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template = loader.get_template(template_name)
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except TemplateDoesNotExist:
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if template_name != ERROR_400_TEMPLATE_NAME:
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# Reraise if it's a missing custom template.
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raise
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return HttpResponseBadRequest(
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ERROR_PAGE_TEMPLATE % {'title': 'Bad Request (400)', 'details': ''},
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content_type='text/html',
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)
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# No exception content is passed to the template, to not disclose any sensitive information.
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return HttpResponseBadRequest(template.render())
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# This can be called when CsrfViewMiddleware.process_view has not run,
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# therefore need @requires_csrf_token in case the template needs
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# {% csrf_token %}.
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@requires_csrf_token
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def permission_denied(request, exception, template_name=ERROR_403_TEMPLATE_NAME):
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"""
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Permission denied (403) handler.
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Templates: :template:`403.html`
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Context: None
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If the template does not exist, an Http403 response containing the text
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"403 Forbidden" (as per RFC 7231) will be returned.
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"""
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try:
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template = loader.get_template(template_name)
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except TemplateDoesNotExist:
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if template_name != ERROR_403_TEMPLATE_NAME:
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# Reraise if it's a missing custom template.
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raise
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return HttpResponseForbidden(
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ERROR_PAGE_TEMPLATE % {'title': '403 Forbidden', 'details': ''},
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content_type='text/html',
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)
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return HttpResponseForbidden(
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template.render(request=request, context={'exception': str(exception)})
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)
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