My personal PyconSEI Talk.

1. DAVVY
DJANGO,WEBDAV E
(PESSIMO) STATO DELL'ARTE
Adriano Di Luzio
Sabato 18 Aprile 2015 - Firenze - PYCONSEI

2. ABOUT ME
Software Developer - Unbit, Roma
Studente - Informatica Magistrale @ Sapienza
www.github.com/aldur
www.twitter.com/AdrianoDiLuzio
2

3. DAVVY: IL SOGNO
3
WebDAV

4. WEBDAV:WHAT?
• Web Distributed Authoring and Versioning [1]
• Estensione di HTTP
• Il web - medium per lettura e scrittura
4
[1] rfc4918

5. WEBDAV:WHO?
Apple (OS X & iOS clients)
Google (Android Calendars, Contacts)
E molte altre implementazioni.
5

6. WEBDAV: HOW?
6
HTTP / WebDAV Request
PROPFIND (XML)
HTTP / WebDAV Response
PROPFIND (XML)
HTTP / WebDAV Request
MKCOL
…

7. HAI DETTO XML?
<D:prop
xmlns:D='DAV:'><author
xml:lang='en'
xmlns:x='http://example.com/ns'
xmlns='http://example.com/ns'
xmlns:h='http://www.w3.org/1999/xhtml'>
<x:name>Jane
Doe</x:name>
<x:uri
added="2005-­‐11-­‐26"
type="email"
>mailto:jane.doe@example.com</x:uri>
<x:uri
added="2005-­‐11-­‐27"
type="web"
>http://www.example.com</x:uri>
<x:notes>
Jane
has
been
working
way
<h:em>too</h:em>
long
on
the
long-­‐awaited
revision
of
&lt;RFC2518&gt;.
</x:notes>
</author>
</D:prop>
7

8. XML & HTTP: RICHIESTA
PROPFIND
/container/
HTTP/1.1
Host:
www.example.com
Content-­‐Type:
application/xml;
charset="utf-­‐8"
Content-­‐Length:
xxxx
<?xml
version="1.0"
encoding="utf-­‐8"
?>
<propfind
xmlns="DAV:">
<propname/>
</propfind>
8

9. XML & HTTP: RISPOSTA
HTTP/1.1
207
Multi-­‐Status
Content-­‐Type:
application/xml;
charset="utf-­‐8"
Content-­‐Length:
xxxx
<?xml
version="1.0"
encoding="utf-­‐8"
?>
<multistatus
xmlns="DAV:">
<response>
<href>http://www.example.com/container/</href>
<propstat>
<prop
xmlns:R="http://ns.example.com/boxschema/">
<R:author/>
<creationdate/>
<displayname/>
<resourcetype/>
</prop>
<status>HTTP/1.1
200
OK</status>
</propstat>
</response>
<!-­‐-­‐
...
-­‐-­‐>
</multistatus>
9

10. Template
DJANGO & DAVVY
Architettura e paradigmi
10
Model
View

11. DJANGO & DAVVY
Architettura e paradigmi
10
Model
View

12. Storage
DJANGO & DAVVY
Architettura e paradigmi
10
Model
View

13. Storage
DJANGO & DAVVY
Architettura e paradigmi
10
Model
View
Properties
XML → WebDAV
Model → XML
Resources
Collections

14. DAVVY: DETTAGLI
• Python 2 / Python 3.
• Estendibile a piacimento (Class-View based)
• Condivisione / protezione delle risorse.
11

15. DAVVY: SET-UP
#
settings.py
DAVVY_STORAGE_PATH
=
'/var/www/davvy'
12
#
urls.py
from
davvy.base
import
WebDAV
from
davvy.addressbook
import
CardDAV
from
davvy.calendar
import
CalDAV
urlpatterns
=
patterns('',
url(r'^principals/(w+)/(.*)',
WebDAV.as_view(root='storage')),
url(r'^storage/(w+)/(.*)',
WebDAV.as_view(root='storage')),
url(r'^addressbook/(w+)/(.*)',
CardDAV.as_view(root='addressbook001')),
url(r'^calendars/(w+)/(.*)',
CalDAV.as_view(root='calendars')),
url(r'^admin/',
include(admin.site.urls)),
)

16. DAVVY: CUSTOMDAV
13
class
CustomDAV(WebDAV):
def
__init__(self,
**kwargs):
self.http_method_names
=
WebDAV.http_method_names
+
['custom']
super(CalDAV,
self).__init__(**kwargs)
def
propfind(self,
request,
user,
resource_name):
return
super(CalDAV,
self).propfind(
request,
user,
resource_name,
shared=True)
def
put(self,
request,
user,
resource_name):
return
super(CalDAV,
self).put(request,
user,
resource_name)
#
[…]
def
custom(self,
request,
user,
resource_name):
#
A
custom
HTTP/WebDAV
method!
pass

17. LO STATO DELL’ARTE
L’INCUBO: I CLIENT
14
OS X Calendar MozillaThunderbird

18. OS X CALENDAR
• Homesets Autodiscovery
• Richieste volanti (PROPFIND /)
• .well-known/{caldav, carddav}
15

19. MOZILLATHUNDERBIRD
1. Nessun supporto out-of-the-box.
2. Lightning Calendar Extension.
3. Nessun supporto i’ll-build-the-box.
16

20. I CLIENT: ROUND II
17
OS X Contacts
MozillaThunderbird
+
SOGo

21. I CLIENT: ROUND III
18
OS X Finder Transmit

22. SENZA FINE!
19

23. E NON SIAMO GLI UNICI!
sabre/dav
20
owncloudradicale
milton

24. L’ALTERNATIVA
https://github.com/unbit/spockfs
21

25. CONCLUSIONI
• Abbiamo imparato molto…
• …soprattutto a stare lontani da WebDAV!
• Nonostante questo, Davvy funziona!
• Almeno fino al prossimo giro di client.
22

26. GRAZIE PER L’ATTENZIONE.
DOMANDE?
23
https://github.com/unbit/davvy/

27. CREDITI RISORSE GRAFICHE
• http://www.kameleon.pics/
• http://icons8.com/
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