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137 lines
3.8 KiB
137 lines
3.8 KiB
import collections
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import json
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import sys
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import uuid
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from flask import (
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template_rendered, request, g,
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Response, current_app, abort, url_for
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)
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from flask_debugtoolbar import module
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from flask_debugtoolbar.panels import DebugPanel
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_ = lambda x: x
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class TemplateDebugPanel(DebugPanel):
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"""
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Panel that displays the time a response took in milliseconds.
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"""
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name = 'Template'
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has_content = True
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# save the context for the 5 most recent requests
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template_cache = collections.deque(maxlen=5)
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@classmethod
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def get_cache_for_key(self, key):
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for cache_key, value in self.template_cache:
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if key == cache_key:
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return value
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raise KeyError(key)
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def __init__(self, *args, **kwargs):
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super(self.__class__, self).__init__(*args, **kwargs)
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self.key = str(uuid.uuid4())
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self.templates = []
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template_rendered.connect(self._store_template_info)
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def _store_template_info(self, sender, **kwargs):
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# only record in the cache if the editor is enabled and there is
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# actually a template for this request
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if not self.templates and is_editor_enabled():
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self.template_cache.append((self.key, self.templates))
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self.templates.append(kwargs)
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def process_request(self, request):
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pass
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def process_response(self, request, response):
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pass
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def nav_title(self):
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return _('Templates')
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def nav_subtitle(self):
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return "%d rendered" % len(self.templates)
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def title(self):
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return _('Templates')
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def url(self):
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return ''
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def content(self):
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return self.render('panels/template.html', {
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'key': self.key,
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'templates': self.templates,
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'editable': is_editor_enabled(),
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})
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def is_editor_enabled():
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return current_app.config.get('DEBUG_TB_TEMPLATE_EDITOR_ENABLED')
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def require_enabled():
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if not is_editor_enabled():
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abort(403)
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def _get_source(template):
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with open(template.filename, 'rb') as fp:
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source = fp.read()
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return source.decode(_template_encoding())
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def _template_encoding():
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return getattr(current_app.jinja_loader, 'encoding', 'utf-8')
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@module.route('/template/<key>')
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def template_editor(key):
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require_enabled()
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# TODO set up special loader that caches templates it loads
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# and can override template contents
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templates = [t['template'] for t in
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TemplateDebugPanel.get_cache_for_key(key)]
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return g.debug_toolbar.render('panels/template_editor.html', {
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'static_path': url_for('_debug_toolbar.static', filename=''),
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'request': request,
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'templates': [
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{'name': t.name, 'source': _get_source(t)}
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for t in templates
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]
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})
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@module.route('/template/<key>/save', methods=['POST'])
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def save_template(key):
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require_enabled()
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template = TemplateDebugPanel.get_cache_for_key(key)[0]['template']
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content = request.form['content'].encode(_template_encoding())
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with open(template.filename, 'wb') as fp:
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fp.write(content)
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return 'ok'
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@module.route('/template/<key>', methods=['POST'])
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def template_preview(key):
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require_enabled()
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context = TemplateDebugPanel.get_cache_for_key(key)[0]['context']
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content = request.form['content']
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env = current_app.jinja_env.overlay(autoescape=True)
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try:
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template = env.from_string(content)
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return template.render(context)
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except Exception as e:
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tb = sys.exc_info()[2]
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try:
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while tb.tb_next:
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tb = tb.tb_next
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msg = {'lineno': tb.tb_lineno, 'error': str(e)}
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return Response(json.dumps(msg), status=400,
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mimetype='application/json')
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finally:
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del tb
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