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handlers.py
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handlers.py
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"""
request handlers:
these are instantiated for every request, then called
"""
import cgi
import os
from datetime import datetime
from pkg_resources import resource_filename
from urllib import quote as _quote
from urlparse import urlparse
from util import strsplit
from util import JSONEncoder
from webob import Response, exc
from tempita import HTMLTemplate
from time import time
def quote(s, safe='/'):
if isinstance(s, unicode):
s = s.encode('utf-8', 'ignore') # hope we're using utf-8!
return _quote(s, safe)
try:
import json
except ImportError:
import simplejson as json
class HandlerMatchException(Exception):
"""the handler doesn't match the request"""
class Handler(object):
"""general purpose request handler (view)"""
methods = set(['GET']) # methods to listen to
handler_path = [] # path elements to match
@classmethod
def match(cls, app, request):
# check the method
if request.method not in cls.methods:
return None
# check the path
if request.environ['path'] != cls.handler_path:
return None
# check the constructor
try:
return cls(app, request)
except HandlerMatchException:
return None
def __init__(self, app, request):
self.app = app
self.request = request
self.check_json() # is this a JSON request?
def __call__(self):
return getattr(self, self.request.method.title())()
def link(self, path=None):
"""
link relative to the site root
"""
path_info = self.request.path_info
segments = path_info.split('/')
if segments[0]:
segments.insert(0, '')
if len(segments) <3:
if not path or path == '/':
return './'
return path
nlayers = len(segments[2:])
string = '../' * nlayers
if not path or path == '/':
return string
return string + path
def redirect(self, location, query=None):
return exc.HTTPSeeOther(location=quote(location) + (query and self.query_string(query) or ''))
def query_string(self, query):
"""
generate a query string; query is a list of 2-tuples
"""
return '?' + '&'.join(['%s=%s' % (i,j)
for i, j in query])
# methods for JSON
def check_json(self):
"""check to see if the request is for JSON"""
self.json = self.request.GET.pop('format', '') == 'json'
def post_data(self):
"""python dict from POST request"""
if self.json:
return json.loads(self.request.body)
else:
return self.request.POST.mixed()
def get_json(self):
"""JSON to serialize if requested for GET"""
raise NotImplementedError # abstract base class
class TempitaHandler(Handler):
"""handler for tempita templates"""
template_dirs = [ resource_filename(__name__, 'templates') ]
template_cache = {}
css = ['css/html5boilerplate.css']
less = ['css/style.less']
js = ['js/jquery-1.6.min.js',
'js/less-1.0.41.min.js',
'js/jquery.timeago.js',
'js/main.js']
def __init__(self, app, request):
Handler.__init__(self, app, request)
# add application template_dir if specified
if app.template_dir:
self.template_dirs = self.template_dirs[:] + [app.template_dir]
self.data = { 'request': request,
'css': self.css,
'item_name': self.app.item_name,
'item_plural': self.app.item_plural,
'less': self.less,
'js': self.js,
'site_name': app.site_name,
'title': self.__class__.__name__,
'hasAbout': bool(app.about),
'urlescape': quote,
'link': self.link}
def find_template(self, name):
"""find a template of a given name"""
# the application caches a dict of the templates if app.reload is False
if name in self.template_cache:
return self.template_cache[name]
for d in self.template_dirs:
path = os.path.join(d, name)
if os.path.exists(path):
template = HTMLTemplate.from_filename(path)
if not self.app.reload:
self.template_cache[name] = template
return template
def render(self, template, **data):
template = self.find_template(template)
if template is None:
raise Exception("I can't find your template")
return template.substitute(**data)
def Get(self):
# needs to have self.template set
if self.json:
return Response(content_type='application/json',
body=json.dumps(self.get_json(), cls=JSONEncoder))
self.data['content'] = self.render(self.template, **self.data)
return Response(content_type='text/html',
body=self.render('main.html', **self.data))
class ProjectsView(TempitaHandler):
"""abstract base class for views of projects"""
js = TempitaHandler.js[:]
js.extend(['js/jquery.tokeninput.js',
'js/jquery.jeditable.js',
'js/jquery.autolink.js',
'js/project.js'])
less = TempitaHandler.less[:]
less.extend(['css/project.less'])
css = TempitaHandler.css[:]
css.extend(['css/token-input.css',
'css/token-input-facebook.css'])
def __init__(self, app, request):
"""project views specific init"""
TempitaHandler.__init__(self, app, request)
self.data['fields'] = self.app.model.fields()
self.data['error'] = None
if not self.json:
self.data['format_date'] = self.format_date
def get_json(self):
"""JSON to serialize if requested"""
return self.data['projects']
def sort(self, field):
reverse = False
if field.startswith('-'):
field = field[1:]
reverse = True
if field == 'name':
self.data['projects'].sort(key=lambda value: value[field].lower(), reverse=reverse)
else:
self.data['projects'].sort(key=lambda value: value[field], reverse=reverse)
def format_date(self, timestamp):
"""return a string representation of a timestamp"""
format_string = '%Y-%m-%dT%H:%M:%SZ'
return datetime.utcfromtimestamp(timestamp).strftime(format_string)
class QueryView(ProjectsView):
"""general index view to query projects"""
template = 'index.html'
methods = set(['GET'])
def __init__(self, app, request):
ProjectsView.__init__(self, app, request)
# pop non-query parameters;
# sort is popped first so that it does go in the query
sort_type = self.request.GET.pop('sort', None)
query = self.request.GET.mixed()
self.data['query'] = query
search = query.pop('q', None)
self.data['search'] = search
# query for tools
self.data['projects']= self.app.model.get(search, **query)
# order the results
self.data['sort_types'] = [('name', 'name'), ('-modified', 'last updated')]
if search:
self.data['sort_types'].insert(0, ('search', 'search rank'))
if sort_type is None:
if search:
sort_type = 'search'
else:
# default
sort_type = '-modified'
self.data['sort_type'] = sort_type
if sort_type != 'search':
# preserve search order results
self.sort(sort_type)
self.data['fields'] = self.app.model.fields()
self.data['title'] = self.app.site_name
class ProjectView(ProjectsView):
"""view of a particular project"""
template = 'index.html'
methods=set(['GET', 'POST'])
@classmethod
def match(cls, app, request):
# check the method
if request.method not in cls.methods:
return None
# the path should match a project
if len(request.environ['path']) != 1:
return None
# get the project if it exists
projectname = request.environ['path'][0]
try:
# if its utf-8, we should try to keep it utf-8
projectname = projectname.decode('utf-8')
except UnicodeDecodeError:
pass
project = app.model.project(projectname)
if not project:
return None
# check the constructor
try:
return cls(app, request, project)
except HandlerMatchException:
return None
def __init__(self, app, request, project):
ProjectsView.__init__(self, app, request)
self.data['fields'] = self.app.model.fields()
self.data['projects'] = [project]
self.data['title'] = project['name']
def get_json(self):
return self.data['projects'][0]
def Post(self):
# data
post_data = self.post_data()
project = self.data['projects'][0]
# don't allow overiding other projects with your fancy rename
if 'name' in post_data and post_data['name'] != project['name']:
if self.app.model.project(post_data['name']):
self.data['title'] = '%s -> %s: Rename error' % (project['name'], post_data['name'])
self.data['error'] = 'Cannot rename over existing project: <a href="%s">%s</a>' % (post_data['name'], post_data['name'] )
self.data['content'] = self.render(self.template, **self.data)
return Response(content_type='text/html',
status=403,
body=self.render('main.html', **self.data))
# XXX for compatability with jeditable:
id = post_data.pop('id', None)
action = post_data.pop('action', None)
old_name = project['name']
if action == 'delete':
for field in self.app.model.fields():
if field in post_data and field in project:
values = post_data.pop(field)
if isinstance(values, basestring):
values = [values]
for value in values:
project[field].remove(value)
if not project[field]:
project.pop(field)
else:
for field in self.app.model.required:
if field in post_data:
project[field] = post_data[field]
for field in self.app.model.fields():
if field in post_data:
value = post_data[field]
if isinstance(value, basestring):
value = strsplit(value)
if action == 'replace':
# replace the field from the POST request
project[field] = value
else:
# append the items....the default action
project.setdefault(field, []).extend(value)
# rename handling
if 'name' in post_data and post_data['name'] != old_name:
self.app.model.delete(old_name)
self.app.model.update(project)
return self.redirect(project['name'])
self.app.model.update(project)
# XXX for compatability with jeditable:
if id is not None:
return Response(content_type='text/plain',
body=cgi.escape(project['description']))
# XXX should redirect instead
return self.Get()
class FieldView(ProjectsView):
"""view of projects sorted by a field"""
template = 'fields.html'
methods=set(['GET', 'POST'])
js = TempitaHandler.js[:] + ['js/field.js']
@classmethod
def match(cls, app, request):
# check the method
if request.method not in cls.methods:
return None
# the path should match a project
if len(request.environ['path']) != 1:
return None
# ensure the field exists
field = request.environ['path'][0]
if field not in app.model.fields():
return None
# check the constructor
try:
return cls(app, request, field)
except HandlerMatchException:
return None
def __init__(self, app, request, field):
ProjectsView.__init__(self, app, request)
projects = self.app.model.field_query(field)
if projects is None:
projects = {}
self.data['field'] = field
self.data['values'] = projects
self.data['title'] = app.item_plural + ' by %s' % field
if self.request.method == 'GET':
# get project descriptions for tooltips
descriptions = {}
project_set = set()
for values in projects.values():
project_set.update(values)
self.data['projects'] = dict([(name, self.app.model.project(name))
for name in project_set])
def Post(self):
field = self.data['field']
for key in self.request.POST.iterkeys():
value = self.request.POST[key]
self.app.model.rename_field_value(field, key, value)
return self.redirect('/' + field + '#' + value)
def get_json(self):
return self.data['values']
class CreateProjectView(TempitaHandler):
"""view to create a new project"""
template = 'new.html'
methods = set(['GET', 'POST'])
handler_path = ['new']
js = TempitaHandler.js[:]
js.extend(['js/jquery.tokeninput.js',
'js/queryString.js',
'js/new.js'])
less = TempitaHandler.less[:]
less.extend(['css/new.less'])
css = TempitaHandler.css[:]
css.extend(['css/token-input.css',
'css/token-input-facebook.css'])
def __init__(self, app, request):
TempitaHandler.__init__(self, app, request)
self.data['title'] = 'Add a ' + app.item_name
self.data['fields'] = self.app.model.fields()
def check_name(self, name):
"""
checks a project name for validity
returns None on success or an error message if invalid
"""
reserved = self.app.reserved.copy()
if name in reserved or name in self.app.model.fields(): # check application-level reserved URLS
return 'reserved'
if self.app.model.project(name): # check projects for conflict
return 'conflict'
def Post(self):
# get some data
required = self.app.model.required
post_data = self.post_data()
# ensure the form isn't over 24 hours old
day = 24*3600
form_date = post_data.pop('form-render-date', -day)
try:
form_date = float(form_date)
except ValueError:
form_date = -day
if abs(form_date - time()) > day:
# if more than a day old, don't honor the request
return Response(content_type='text/plain',
status=400,
body="Your form is over a day old or you don't have Javascript enabled")
# build up a project dict
project = dict([(i, post_data.get(i, '').strip())
for i in required])
# check for errors
errors = {}
missing = set([i for i in required if not project[i]])
if missing: # missing required fields
errors['missing'] = missing
# TODO check for duplicate project name
# and other url namespace collisions
name_conflict = self.check_name(project['name'])
if name_conflict:
errors[name_conflict] = [project['name']]
if errors:
error_list = []
for key in errors:
# flatten the error dict into a list
error_list.extend([(key, i) for i in errors[key]])
return self.redirect(self.request.path_info.strip('/'), error_list)
# add fields to the project
for field in self.app.model.fields():
value = post_data.get(field, '').strip()
values = strsplit(value)
if not value:
continue
project[field] = values or value
self.app.model.update(project)
return self.redirect('/' + project['name'])
class DeleteProjectHandler(Handler):
methods = set(['POST'])
handler_path = ['delete']
def Post(self):
post_data = self.post_data()
project = post_data.get('project')
if project:
try:
self.app.model.delete(project)
except:
pass # XXX better than internal server error
# redirect to query view
return self.redirect(location='/')
class TagsView(TempitaHandler):
"""view most popular tags"""
methods = set(['GET'])
handler_path = ['tags']
template = 'tags.html'
def __init__(self, app, request):
TempitaHandler.__init__(self, app, request)
self.data['fields'] = self.app.model.fields()
fields = self.request.GET.getall('field') or self.data['fields']
query = self.request.GET.get('q', '')
self.data['title'] = 'Tags'
field_tags = dict((i, {}) for i in fields)
omit = self.request.GET.getall('omit')
ommitted = dict([(field, set()) for field in fields])
for name in omit:
project = self.app.model.project(name)
if not project:
continue
for field in fields:
ommitted[field].update(project.get(field, []))
for project in self.app.model.get():
if project in omit:
continue
# TODO: cache this for speed somehow
# possibly at the model level
for field in fields:
for value in project.get(field, []):
if value in ommitted[field] or query not in value:
continue
count = field_tags[field].get(value, 0) + 1
field_tags[field][value] = count
tags = []
for field in field_tags:
for value, count in field_tags[field].items():
tags.append({'field': field, 'value': value, 'count': count, 'id': value, 'name': value})
tags.sort(key=lambda x: x['count'], reverse=True)
self.data['tags'] = tags
def get_json(self):
return self.data['tags']
class AboutView(TempitaHandler):
"""the obligatory about page"""
methods = set(['GET'])
handler_path = ['about']
template = 'about.html'
less = TempitaHandler.less[:] + ['css/about.less']
def __init__(self, app, request):
TempitaHandler.__init__(self, app, request)
self.data['fields'] = self.app.model.fields()
self.data['title'] = 'about:' + self.app.site_name
self.data['about'] = self.app.about
class NotFound(TempitaHandler):
def __init__(self, app, request):
TempitaHandler.__init__(self, app, request)
self.data['fields'] = self.app.model.fields()
def __call__(self):
self.data['content'] = '<h1 id="title">Not Found</h1>'
return Response(content_type='text/html',
status=404,
body=self.render('main.html', **self.data))