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"]),
            ],
        ),
    ],
)

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!