OwnCloud/NextCloud emulator

pyproject.toml

[tool.poetry]
name = "owncloudemulator"
version = "0.1.0"
description = ""
authors = ["Florian Apolloner <florian@apolloner.eu>"]

[tool.poetry.dependencies]
python = "^3.7"
starlette = "^0.13.0"
uvicorn = "^0.10.8"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

server.py

# This simple server emulates a owncloud server for gnome-online-accounts.
# It just redirects the DAV discovery to fastmail :D

from starlette.applications import Starlette
from starlette.routing import Route, Mount
from starlette.requests import Request
from starlette.responses import Response, RedirectResponse


async def homepage(request: Request):
    return Response()


async def dav(request: Request):
    mapping = {
        "caldav": "https://caldav.fastmail.com/dav/calendars",
        "carddav": "https://carddav.fastmail.com/dav/addressbooks",
    }
    return RedirectResponse(mapping[request.path_params["type"]])


app = Starlette(
    debug=False,
    routes=[
        Route("/.well-known/{type}", dav, methods=["PROPFIND"]),
        Mount(
            "/remote.php",
            routes=[
                Route("/webdav/", homepage),
                Route("/{type}/", dav, methods=["PROPFIND"]),
            ],
        ),
    ],
)

Thanks a lot for this snippet!
Just for future reference, this snipped helps in addressing this feature request: https://bugzilla.gnome.org/show_bug.cgi?id=720519

What does this do?

This script makes it easy to use fastmail calendars in gnome-accounts.
It emulates a simple Owncloud instance that redirects caldav urls to fastmail.

Running the script locally

poetry install
poetry run uvicorn --reload server:app

Now use localhost:8000 as the server address in the Owncloud plugin in gnome-accounts. The username and password are your fastmail username and an app-password with CalDav access.

This is brilliant and so simple. Worked perfectly for me - thank you!

I used it for zimbra - which has the following URL:

        "caldav": "https://$SERVER/dav/$USER/Calendar",

Hey! This works great; I'm curious about adding webdav (files) support as well. I'm guessing it's in the dav() function mapping .. would something like this work:

"webdav": "https://myfiles.fastmail.com"

? Thanks again for the great little tool!

@duckwork I don't think that works since you cannot generate app passwords in fastmail (I just tried) which provide access to CardDav/CalDav & Files :( But if you are just using your normal password you might try adding the mapping and remove the Route in line 29.

FWIW I have asked the fastmail CEO if this could be added https://twitter.com/fapolloner/status/1254138648238448640

And even then it won't work because gvfs cannot follow redirects: https://gitlab.gnome.org/GNOME/gvfs/-/issues/177 :(

hmm.. thanks for the reply! I realized that for now, I can just add fastmail's files in Nautilus with davfs://
so that works well enough.
Thanks for the reply! AND for the message to Fastmail -- it should be an option, I think.

Yes, file integration from goa doesn't much more than that by itself anyways I think.

Thanks a lot !!!!!

This is so much better than using bloaty evolution for adding/removing contacts and calendar but using preinstalled gnome applications for viewing it.

(BTW, I rewrote it in Go because its leaner and installing it is easier (single systemd service and no venv) but whatever )

There is an upstream MR to get official support for CalDAV in gnome-online-accounts.
https://gitlab.gnome.org/GNOME/gnome-online-accounts/-/merge_requests/54

Hopefully it gets reviewed and merged so workarounds aren't necessary.

I added a merge request for fastmail support a year ago with no response yet. If you look at the master https://gitlab.gnome.org/GNOME/gnome-online-accounts/-/commits/master aside from translations there isn't happening anything since a while; I do not have any hopes and sadly have to assume that goa is abandonware.

The same, as dependency-less python3. Feel free to use (MIT).

#!/usr/bin/env python3

# Copyright (c) 2023 Philip Smith
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all 
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
# SOFTWARE.

import os
from http.server import ThreadingHTTPServer, BaseHTTPRequestHandler

HOST = os.getenv('HOST', 'localhost')
PORT = int(os.getenv('PORT', '8080'))
CALDAV = os.getenv('CALDAV', 'https://caldav.fastmail.com/dav/calendars')
CARDDAV = os.getenv('CARDDAV', 'https://carddav.fastmail.com/dav/addressbooks')

REDIRECTS = {
        '/.well-known/caldav': CALDAV,
        '/.well-known/carddav': CARDDAV,
        '/remote.php/caldav/': CALDAV,
        '/remote.php/carddav/': CARDDAV,
        }

class Redirect(BaseHTTPRequestHandler):
    def do_GET(self):
        if self.path == '/remote.php/webdav/':
            self.send_response(200)
            self.end_headers()

    def do_PROPFIND(self):
        location = REDIRECTS.get(self.path)
        if location:
            self.send_response(302)
            self.send_header('Location', location)
            self.end_headers()

ThreadingHTTPServer((HOST, PORT), Redirect).serve_forever()

The same, as dependency-less python3. Feel free to use (MIT).

#!/usr/bin/env python3

# Copyright (c) 2023 Philip Smith
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all 
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
# SOFTWARE.

import os
from http.server import ThreadingHTTPServer, BaseHTTPRequestHandler

HOST = os.getenv('HOST', 'localhost')
PORT = int(os.getenv('PORT', '8080'))
CALDAV = os.getenv('CALDAV', 'https://caldav.fastmail.com/dav/calendars')
CARDDAV = os.getenv('CARDDAV', 'https://carddav.fastmail.com/dav/addressbooks')

REDIRECTS = {
        '/.well-known/caldav': CALDAV,
        '/.well-known/carddav': CARDDAV,
        '/remote.php/caldav/': CALDAV,
        '/remote.php/carddav/': CARDDAV,
        }

class Redirect(BaseHTTPRequestHandler):
    def do_GET(self):
        if self.path == '/remote.php/webdav/':
            self.send_response(200)
            self.end_headers()

    def do_PROPFIND(self):
        location = REDIRECTS.get(self.path)
        if location:
            self.send_response(302)
            self.send_header('Location', location)
            self.end_headers()

ThreadingHTTPServer((HOST, PORT), Redirect).serve_forever()

@phs I have created a tool of my own based on this script. Basically I just added a config_file argument, to accept a config file that is used to set the CalDAV and CardDAV URLs. I have credited you for the script: https://gitlab.com/julianfairfax/gnome-dav-proxy#related-projects-and-alternatives, and my tool is licensed as MIT, as yours is: https://gitlab.com/julianfairfax/gnome-dav-proxy#license. Please let me know if any of this is a (licensing) issue for you, and I will do my best to rectify it.

Please let me know if any of this is a (licensing) issue for you, and I will do my best to rectify it.

Nope, go for it. And thanks for putting that together!