bazarr/libs/flask_debugtoolbar/__init__.py

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2019-12-16 13:58:10 +00:00
import os
import warnings
from flask import Blueprint, current_app, request, g, send_from_directory
from flask.globals import _request_ctx_stack
from jinja2 import Environment, PackageLoader
from werkzeug.urls import url_quote_plus
from flask_debugtoolbar.compat import iteritems
from flask_debugtoolbar.toolbar import DebugToolbar
from flask_debugtoolbar.utils import decode_text
module = Blueprint('debugtoolbar', __name__)
def replace_insensitive(string, target, replacement):
"""Similar to string.replace() but is case insensitive
Code borrowed from:
http://forums.devshed.com/python-programming-11/case-insensitive-string-replace-490921.html
"""
no_case = string.lower()
index = no_case.rfind(target.lower())
if index >= 0:
return string[:index] + replacement + string[index + len(target):]
else: # no results so return the original string
return string
def _printable(value):
try:
return decode_text(repr(value))
except Exception as e:
return '<repr(%s) raised %s: %s>' % (
object.__repr__(value), type(e).__name__, e)
class DebugToolbarExtension(object):
_static_dir = os.path.realpath(
os.path.join(os.path.dirname(__file__), 'static'))
_redirect_codes = [301, 302, 303, 304]
def __init__(self, app=None):
self.app = app
self.debug_toolbars = {}
# Configure jinja for the internal templates and add url rules
# for static data
self.jinja_env = Environment(
autoescape=True,
extensions=['jinja2.ext.i18n', 'jinja2.ext.with_'],
loader=PackageLoader(__name__, 'templates'))
self.jinja_env.filters['urlencode'] = url_quote_plus
self.jinja_env.filters['printable'] = _printable
if app is not None:
self.init_app(app)
def init_app(self, app):
for k, v in iteritems(self._default_config(app)):
app.config.setdefault(k, v)
if not app.config['DEBUG_TB_ENABLED']:
return
if not app.config.get('SECRET_KEY'):
raise RuntimeError(
"The Flask-DebugToolbar requires the 'SECRET_KEY' config "
"var to be set")
DebugToolbar.load_panels(app)
app.before_request(self.process_request)
app.after_request(self.process_response)
app.teardown_request(self.teardown_request)
# Monkey-patch the Flask.dispatch_request method
app.dispatch_request = self.dispatch_request
app.add_url_rule('/_debug_toolbar/static/<path:filename>',
'_debug_toolbar.static', self.send_static_file)
app.register_blueprint(module, url_prefix='/_debug_toolbar/views')
def _default_config(self, app):
return {
'DEBUG_TB_ENABLED': app.debug,
'DEBUG_TB_HOSTS': (),
'DEBUG_TB_INTERCEPT_REDIRECTS': True,
'DEBUG_TB_PANELS': (
'flask_debugtoolbar.panels.versions.VersionDebugPanel',
'flask_debugtoolbar.panels.timer.TimerDebugPanel',
'flask_debugtoolbar.panels.headers.HeaderDebugPanel',
'flask_debugtoolbar.panels.request_vars.RequestVarsDebugPanel',
'flask_debugtoolbar.panels.config_vars.ConfigVarsDebugPanel',
'flask_debugtoolbar.panels.template.TemplateDebugPanel',
'flask_debugtoolbar.panels.sqlalchemy.SQLAlchemyDebugPanel',
'flask_debugtoolbar.panels.logger.LoggingPanel',
'flask_debugtoolbar.panels.route_list.RouteListDebugPanel',
'flask_debugtoolbar.panels.profiler.ProfilerDebugPanel',
),
}
def dispatch_request(self):
"""Modified version of Flask.dispatch_request to call process_view."""
req = _request_ctx_stack.top.request
app = current_app
if req.routing_exception is not None:
app.raise_routing_exception(req)
rule = req.url_rule
# if we provide automatic options for this URL and the
# request came with the OPTIONS method, reply automatically
if getattr(rule, 'provide_automatic_options', False) \
and req.method == 'OPTIONS':
return app.make_default_options_response()
# otherwise dispatch to the handler for that endpoint
view_func = app.view_functions[rule.endpoint]
view_func = self.process_view(app, view_func, req.view_args)
return view_func(**req.view_args)
def _show_toolbar(self):
"""Return a boolean to indicate if we need to show the toolbar."""
if request.blueprint == 'debugtoolbar':
return False
hosts = current_app.config['DEBUG_TB_HOSTS']
if hosts and request.remote_addr not in hosts:
return False
return True
def send_static_file(self, filename):
"""Send a static file from the flask-debugtoolbar static directory."""
return send_from_directory(self._static_dir, filename)
def process_request(self):
g.debug_toolbar = self
if not self._show_toolbar():
return
real_request = request._get_current_object()
self.debug_toolbars[real_request] = (
DebugToolbar(real_request, self.jinja_env))
for panel in self.debug_toolbars[real_request].panels:
panel.process_request(real_request)
def process_view(self, app, view_func, view_kwargs):
""" This method is called just before the flask view is called.
This is done by the dispatch_request method.
"""
real_request = request._get_current_object()
try:
toolbar = self.debug_toolbars[real_request]
except KeyError:
return view_func
for panel in toolbar.panels:
new_view = panel.process_view(real_request, view_func, view_kwargs)
if new_view:
view_func = new_view
return view_func
def process_response(self, response):
real_request = request._get_current_object()
if real_request not in self.debug_toolbars:
return response
# Intercept http redirect codes and display an html page with a
# link to the target.
if current_app.config['DEBUG_TB_INTERCEPT_REDIRECTS']:
if (response.status_code in self._redirect_codes and
not real_request.is_xhr):
redirect_to = response.location
redirect_code = response.status_code
if redirect_to:
content = self.render('redirect.html', {
'redirect_to': redirect_to,
'redirect_code': redirect_code
})
response.content_length = len(content)
response.location = None
response.response = [content]
response.status_code = 200
# If the http response code is 200 then we process to add the
# toolbar to the returned html response.
if not (response.status_code == 200 and
response.is_sequence and
response.headers['content-type'].startswith('text/html')):
return response
response_html = response.data.decode(response.charset)
no_case = response_html.lower()
body_end = no_case.rfind('</body>')
if body_end >= 0:
before = response_html[:body_end]
after = response_html[body_end:]
elif no_case.startswith('<!doctype html>'):
before = response_html
after = ''
else:
warnings.warn('Could not insert debug toolbar.'
' </body> tag not found in response.')
return response
toolbar = self.debug_toolbars[real_request]
for panel in toolbar.panels:
panel.process_response(real_request, response)
toolbar_html = toolbar.render_toolbar()
content = ''.join((before, toolbar_html, after))
content = content.encode(response.charset)
response.response = [content]
response.content_length = len(content)
return response
def teardown_request(self, exc):
self.debug_toolbars.pop(request._get_current_object(), None)
def render(self, template_name, context):
template = self.jinja_env.get_template(template_name)
return template.render(**context)