Restrict third-party shell plugin capabilities

Reported-by: Roger Piñol <rogerpicar@gmail.com>

test/shell.d/fixtures/plugin-auth-boundary/AuthStoreOwner.qml

@@ -0,0 +1,12 @@
+import QtQuick
+import "services/AuthServiceStore.js" as AuthServiceStore
+
+QtObject {
+  function retain(id, service) {
+    AuthServiceStore.put(id, service)
+  }
+
+  function has(id) {
+    return AuthServiceStore.has(id)
+  }
+}

test/shell.d/fixtures/plugin-auth-boundary/AuthStoreReader.qml

@@ -0,0 +1,8 @@
+import QtQuick
+import "services/AuthServiceStore.js" as AuthServiceStore
+
+QtObject {
+  function has(id) {
+    return AuthServiceStore.has(id)
+  }
+}

test/shell.d/fixtures/plugin-auth-boundary/shell.qml

@@ -0,0 +1,82 @@
+import QtQuick
+import Quickshell
+import Quickshell.Io
+import "services"
+
+ShellRoot {
+  id: root
+
+  property var calls: []
+  property QtObject ownService: QtObject { property string marker: "own" }
+
+  AuthStoreOwner { id: authStoreOwner }
+  AuthStoreReader { id: authStoreReader }
+
+  Component {
+    id: apiComponent
+    PluginShellApi { }
+  }
+
+  FileView {
+    id: resultFile
+    path: Quickshell.env("OMARCHY_QML_TEST_RESULT")
+    atomicWrites: true
+  }
+
+  Component.onCompleted: {
+    var caller = "example.safe"
+    authStoreOwner.retain("omarchy.lock", root.ownService)
+    var api = apiComponent.createObject(null, {
+      pluginId: caller,
+      _serviceLookup: function(requestedId) {
+        return requestedId === caller ? root.ownService : null
+      },
+      _summon: function(requestedId) {
+        if (requestedId !== caller) return false
+        root.calls = root.calls.concat(["summon"])
+        return true
+      },
+      _hide: function(requestedId) {
+        if (requestedId !== caller) return false
+        root.calls = root.calls.concat(["hide"])
+        return true
+      },
+      _toggle: function(requestedId) {
+        if (requestedId !== caller) return false
+        root.calls = root.calls.concat(["toggle"])
+        return true
+      },
+      _isOpen: function(requestedId) { return requestedId === caller },
+      _updateSettings: function(requestedId) {
+        if (requestedId !== caller) return false
+        root.calls = root.calls.concat(["settings"])
+        return true
+      }
+    })
+
+    var own = api.serviceFor(caller)
+    var result = {
+      detached: api.parent === undefined || api.parent === null,
+      ownService: own && own.marker === "own",
+      foreignService: api.serviceFor("omarchy.lock") === null,
+      firstPartyService: api.firstPartyServiceFor("omarchy.polkit") === null,
+      ownSummon: api.summon(caller, "{}") === true,
+      foreignSummon: api.summon("omarchy.lock", "{}") === false,
+      ownHide: api.hide(caller) === true,
+      foreignHide: api.hide("omarchy.lock") === false,
+      ownToggle: api.toggle(caller, "{}") === true,
+      foreignToggle: api.toggle("omarchy.lock", "{}") === false,
+      ownOpen: api.isPluginOpen(caller) === true,
+      foreignOpen: api.isPluginOpen("omarchy.lock") === false,
+      ownSettings: api.updateEntryInline(caller, {}) === true,
+      foreignSettings: api.updateEntryInline("omarchy.lock", {}) === false,
+      authStoreOwnerRetains: authStoreOwner.has("omarchy.lock") === true,
+      authStoreImportIsolated: authStoreReader.has("omarchy.lock") === false,
+      calls: root.calls
+    }
+    result.ok = Object.keys(result).every(function(key) {
+      return key === "ok" || key === "calls" || result[key] === true
+    }) && JSON.stringify(result.calls) === JSON.stringify(["summon", "hide", "toggle", "settings"])
+    resultFile.setText(JSON.stringify(result))
+  }
+}