SERVER-58076 Exclude new 5.0 language features from stable API

1 files changed, 91 insertions, 0 deletions

diff --git a/src/mongo/db/query/allowed_contexts.cpp b/src/mongo/db/query/allowed_contexts.cpp
new file mode 100644
index 00000000000..1a2eebadc7f
--- /dev/null
+++ b/src/mongo/db/query/allowed_contexts.cpp
@@ -0,0 +1,91 @@
+/**
+ *    Copyright (C) 2021-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/query/allowed_contexts.h"
+
+#include "mongo/transport/session.h"
+
+namespace mongo {
+
+void assertLanguageFeatureIsAllowed(
+    const OperationContext* opCtx,
+    std::string operatorName,
+    AllowedWithApiStrict allowedWithApiStrict,
+    AllowedWithClientType allowedWithClientType,
+    boost::optional<std::function<void(const APIParameters&)>> callbackForSometimesAllowed) {
+    // An internal client could be one of the following :
+    //     - Does not have any transport session
+    //     - The transport session tag is internal
+    auto client = opCtx->getClient();
+    const auto isInternalClient = client &&
+        (!client->session() ||
+         (client->session()->getTags() & transport::Session::kInternalClient));
+
+    const auto apiParameters = APIParameters::get(opCtx);
+
+    uassert(5491300,
+            str::stream() << operatorName << "' is not allowed in user requests",
+            !(allowedWithClientType == AllowedWithClientType::kInternal && !isInternalClient));
+
+    const auto apiVersion = apiParameters.getAPIVersion().value_or("");
+    const auto apiStrict = apiParameters.getAPIStrict().value_or(false);
+    if (!apiStrict) {
+        return;
+    }
+    switch (allowedWithApiStrict) {
+        case AllowedWithApiStrict::kNeverInVersion1: {
+            uassert(ErrorCodes::APIStrictError,
+                    str::stream() << operatorName
+                                  << " is not allowed with 'apiStrict: true' in API Version "
+                                  << apiVersion,
+                    apiVersion != "1");
+            break;
+        }
+        case AllowedWithApiStrict::kInternal: {
+            uassert(ErrorCodes::APIStrictError,
+                    str::stream() << operatorName
+                                  << " cannot be specified with 'apiStrict: true' in API Version "
+                                  << apiVersion,
+                    isInternalClient);
+            break;
+        }
+        case AllowedWithApiStrict::kSometimes: {
+            if (auto callback = callbackForSometimesAllowed) {
+                (*callback)(apiParameters);
+            }
+            break;
+        }
+        case AllowedWithApiStrict::kAlways: {
+            break;
+        }
+    }
+}
+}  // namespace mongo