feat(dav,obsidian): grupo dav completo (CardDAV/CalDAV client + split vcf/ics + import pipelines) + build_obsidian_graph + dav_list_calendars

Funciones reutilizables creadas esta sesion para el sistema self-hosted de contactos/calendario (Xandikos) y la app osint_web:
- grupo dav (infra): split_vcards, split_vevents_to_vcalendars, extract_or_make_uid, carddav_put_vcard, caldav_put_event, dav_list_resources, dav_get_resource, dav_list_calendars
- pipelines: import_vcf_to_carddav, import_ics_to_caldav
- obsidian: build_obsidian_graph (grafo agregado del vault)

python/functions/infra/dav_get_resource_test.py

@@ -0,0 +1,88 @@
+"""Tests para dav_get_resource.
+
+Smoke deterministas: monkeypatchean urllib.request.urlopen para capturar el
+Request (method GET, auth, URL) y devolver un cuerpo simulado.
+"""
+
+import base64
+import sys
+
+import infra.dav_get_resource  # noqa: F401
+
+mod = sys.modules["infra.dav_get_resource"]
+dav_get_resource = mod.dav_get_resource
+
+_BODY = "BEGIN:VCARD\r\nVERSION:3.0\r\nFN:Ada Lovelace\r\nEND:VCARD\r\n"
+
+
+class _FakeResp:
+    status = 200
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *a):
+        return False
+
+    def read(self):
+        return _BODY.encode("utf-8")
+
+
+def _capture(monkeypatch):
+    captured = {}
+
+    def fake_urlopen(req, timeout=None, context=None):
+        captured["url"] = req.full_url
+        captured["method"] = req.get_method()
+        captured["headers"] = {k.lower(): v for k, v in req.header_items()}
+        return _FakeResp()
+
+    monkeypatch.setattr(mod.urllib.request, "urlopen", fake_urlopen)
+    return captured
+
+
+def test_construye_request_get_con_auth(monkeypatch):
+    cap = _capture(monkeypatch)
+    res = dav_get_resource(
+        "https://dav.example.com", "enmanuel", "secret-pw",
+        "/enmanuel/contacts/addressbook/ada.vcf",
+    )
+    assert res["status"] == "ok"
+    assert cap["method"] == "GET"
+    expected = "Basic " + base64.b64encode(b"enmanuel:secret-pw").decode("ascii")
+    assert cap["headers"]["authorization"] == expected
+
+
+def test_resource_path_relativo_se_resuelve_con_base_url(monkeypatch):
+    cap = _capture(monkeypatch)
+    dav_get_resource(
+        "https://dav.example.com", "u", "p",
+        "/enmanuel/contacts/addressbook/ada.vcf",
+    )
+    assert cap["url"] == "https://dav.example.com/enmanuel/contacts/addressbook/ada.vcf"
+
+
+def test_resource_path_absoluto_se_respeta(monkeypatch):
+    cap = _capture(monkeypatch)
+    abs_url = "https://otra.example.com/path/x.vcf"
+    dav_get_resource("https://dav.example.com", "u", "p", abs_url)
+    assert cap["url"] == abs_url
+
+
+def test_devuelve_texto_del_recurso(monkeypatch):
+    _capture(monkeypatch)
+    res = dav_get_resource(
+        "https://dav.example.com", "u", "p", "/x.vcf",
+    )
+    assert res["text"] == _BODY
+    assert res["http_status"] == 200
+
+
+def test_httperror_devuelve_status_error(monkeypatch):
+    def fake_urlopen(req, timeout=None, context=None):
+        raise mod.urllib.error.HTTPError(req.full_url, 404, "Not Found", {}, None)
+
+    monkeypatch.setattr(mod.urllib.request, "urlopen", fake_urlopen)
+    res = dav_get_resource("https://dav.example.com", "u", "p", "/x.vcf")
+    assert res["status"] == "error"
+    assert res["http_status"] == 404