Import upstream v0.16.22, stripped

Upstream commit: 474dd0229cb20cf513036619781ed97bd8073c3f
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 117 in 50 files
Dangling module declarations removed: 5
Cargo edits turning enterprise off: 14
Verification: clean
Enterprise feature gates left for rebuilt features: 19 in 18 files

Produced by tools/fork/strip.py. The full report is in docs/fork/strip-reports/ on main.

crates/dav/src/principal/mod.rs

@@ -0,0 +1,29 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ */
+
+use common::auth::AccountCache;
+use dav_proto::schema::response::Href;
+use groupware::RFC_3986;
+
+use crate::DavResourceName;
+
+pub mod matching;
+pub mod propfind;
+pub mod propsearch;
+
+pub trait CurrentUserPrincipal {
+    fn current_user_principal(&self) -> Href;
+}
+
+impl CurrentUserPrincipal for AccountCache {
+    fn current_user_principal(&self) -> Href {
+        Href(format!(
+            "{}/{}/",
+            DavResourceName::Principal.base_path(),
+            percent_encoding::utf8_percent_encode(self.name(), RFC_3986)
+        ))
+    }
+}