istio.io/istio@v0.0.0-20240520182934-d79c90f27776/samples/wasm_modules/header_injector/plugin.cc (about)

     1  // Copyright Istio Authors. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #include "plugin.h"
    16  
    17  #ifndef INJECTION_VERSION
    18  #error INJECTION_VERSION must be defined
    19  #endif // INJECTION_VERSION
    20  
    21  #define xstr(s) str(s)
    22  #define str(s) #s
    23  
    24  // Boilderplate code to register the extension implementation.
    25  static RegisterContextFactory register_HeaderInjector(CONTEXT_FACTORY(HeaderInjectorContext),
    26                                                 ROOT_FACTORY(HeaderInjectorRootContext));
    27  
    28  bool HeaderInjectorRootContext::onConfigure(size_t) { return true; }
    29  
    30  FilterHeadersStatus HeaderInjectorContext::onRequestHeaders(uint32_t, bool) {
    31    addRequestHeader("X-Req-Injection", xstr(INJECTION_VERSION));
    32    return FilterHeadersStatus::Continue;
    33  }
    34  
    35  FilterHeadersStatus HeaderInjectorContext::onResponseHeaders(uint32_t, bool) {
    36    addResponseHeader("X-Resp-Injection", xstr(INJECTION_VERSION));
    37    return FilterHeadersStatus::Continue;
    38  }