github.com/lastbackend/toolkit@v0.0.0-20241020043710-cafa37b95aad/pkg/server/http/handler.go (about)

     1  /*
     2  Copyright [2014] - [2023] The Last.Backend authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package http
    18  
    19  import (
    20  	"context"
    21  	"encoding/json"
    22  	"net/http"
    23  	"strings"
    24  
    25  	"github.com/lastbackend/toolkit/pkg/context/metadata"
    26  	"github.com/lastbackend/toolkit/pkg/server"
    27  	grpc_md "google.golang.org/grpc/metadata"
    28  )
    29  
    30  type HandleOption func(*HandleOptions)
    31  
    32  type HandleOptions struct {
    33  	Middlewares server.HttpServerMiddleware
    34  }
    35  
    36  type Handler func(w http.ResponseWriter, r *http.Request) error
    37  
    38  func corsHandlerFunc(w http.ResponseWriter, r *http.Request) {
    39  	w.Header().Add("Access-Control-Allow-Origin", r.Header.Get("Origin"))
    40  	w.Header().Add("Access-Control-Allow-Credentials", "true")
    41  	w.Header().Add("Access-Control-Allow-Methods", "OPTIONS,GET,POST,PUT,DELETE")
    42  	w.Header().Add("Access-Control-Expose-Headers", "Content-Disposition")
    43  	w.Header().Add("Access-Control-Allow-Headers", "Authorization,Content-Type,Origin,X-Tools-Name,X-Requested-With,Content-Name,Accept,Accept-Range,Range")
    44  	w.Header().Add("Content-Type", "application/json")
    45  }
    46  
    47  func (s *httpServer) methodNotAllowedHandler() http.Handler {
    48  	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    49  		if s.opts.EnableCORS {
    50  			corsHandlerFunc(w, r)
    51  		}
    52  		w.WriteHeader(http.StatusMethodNotAllowed)
    53  		w.Write(makeResponse(http.StatusMethodNotAllowed, "Method Not Allowed"))
    54  	})
    55  }
    56  
    57  func (s *httpServer) methodNotFoundHandler() http.Handler {
    58  	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    59  		if s.opts.EnableCORS {
    60  			corsHandlerFunc(w, r)
    61  		}
    62  		w.WriteHeader(http.StatusNotFound)
    63  		w.Write(makeResponse(http.StatusNotFound, "Not Found"))
    64  	})
    65  }
    66  
    67  type response struct {
    68  	Code    int    `json:"code"`
    69  	Status  string `json:"status"`
    70  	Message string `json:"message"`
    71  }
    72  
    73  func makeResponse(code int, message string) []byte {
    74  	r, _ := json.Marshal(response{
    75  		Code:    code,
    76  		Status:  http.StatusText(code),
    77  		Message: message,
    78  	})
    79  	return r
    80  }
    81  
    82  func NewIncomingContext(ctx context.Context, headers map[string]string) context.Context {
    83  	if headers == nil {
    84  		headers = make(map[string]string)
    85  	}
    86  	if md, ok := metadata.LoadFromContext(ctx); ok {
    87  		for k, v := range md {
    88  			headers[strings.ToLower(k)] = v
    89  		}
    90  		return grpc_md.NewIncomingContext(ctx, grpc_md.New(md))
    91  	}
    92  	return grpc_md.NewIncomingContext(ctx, grpc_md.New(headers))
    93  }