github.com/mendersoftware/go-lib-micro@v0.0.0-20240304135804-e8e39c59b148/customheader/middleware.go (about)

     1  // Copyright 2023 Northern.tech AS
     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  package customheader
    16  
    17  import "github.com/ant0ine/go-json-rest/rest"
    18  
    19  // Add custom HTTP header to all server responses
    20  type CustomHeaderMiddleware struct {
    21  	HeaderName  string
    22  	HeaderValue string
    23  }
    24  
    25  // MiddlewareFunc makes CustomHeaderMiddleware implement the Middleware interface.
    26  func (c *CustomHeaderMiddleware) MiddlewareFunc(h rest.HandlerFunc) rest.HandlerFunc {
    27  	return func(w rest.ResponseWriter, r *rest.Request) {
    28  
    29  		if len(c.HeaderName) > 0 {
    30  			w.Header().Add(c.HeaderName, c.HeaderValue)
    31  		}
    32  
    33  		// call the handler
    34  		h(w, r)
    35  	}
    36  }