github.com/ethereum/go-ethereum@v1.14.3/graphql/graphiql.go (about)

     1  // The MIT License (MIT)
     2  //
     3  // Copyright (c) 2016 Muhammed Thanish
     4  //
     5  // Permission is hereby granted, free of charge, to any person obtaining a copy
     6  // of this software and associated documentation files (the "Software"), to deal
     7  // in the Software without restriction, including without limitation the rights
     8  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     9  // copies of the Software, and to permit persons to whom the Software is
    10  // furnished to do so, subject to the following conditions:
    11  //
    12  // The above copyright notice and this permission notice shall be included in all
    13  // copies or substantial portions of the Software.
    14  //
    15  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    16  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    17  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    18  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    19  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    20  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    21  // SOFTWARE.
    22  
    23  package graphql
    24  
    25  import (
    26  	"encoding/json"
    27  	"net/http"
    28  	"path/filepath"
    29  
    30  	"github.com/ethereum/go-ethereum/graphql/internal/graphiql"
    31  	"github.com/ethereum/go-ethereum/log"
    32  )
    33  
    34  // GraphiQL is an in-browser IDE for exploring GraphiQL APIs.
    35  // This handler returns GraphiQL when requested.
    36  //
    37  // For more information, see https://github.com/graphql/graphiql.
    38  type GraphiQL struct{}
    39  
    40  func respOk(w http.ResponseWriter, body []byte, ctype string) {
    41  	w.Header().Set("Content-Type", ctype)
    42  	w.Header().Set("X-Content-Type-Options", "nosniff")
    43  	w.Write(body)
    44  }
    45  
    46  func respErr(w http.ResponseWriter, msg string, code int) {
    47  	w.Header().Set("Content-Type", "application/json")
    48  	w.WriteHeader(code)
    49  	errMsg, _ := json.Marshal(struct {
    50  		Error string
    51  	}{Error: msg})
    52  	w.Write(errMsg)
    53  }
    54  
    55  func (h GraphiQL) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    56  	if r.Method != http.MethodGet {
    57  		respErr(w, "only GET allowed", http.StatusMethodNotAllowed)
    58  		return
    59  	}
    60  	switch r.URL.Path {
    61  	case "/graphql/ui/graphiql.min.css":
    62  		data, err := graphiql.Assets.ReadFile(filepath.Base(r.URL.Path))
    63  		if err != nil {
    64  			log.Warn("Error loading graphiql asset", "err", err)
    65  			respErr(w, "internal error", http.StatusInternalServerError)
    66  			return
    67  		}
    68  		respOk(w, data, "text/css")
    69  	case "/graphql/ui/graphiql.min.js",
    70  		"/graphql/ui/react.production.min.js",
    71  		"/graphql/ui/react-dom.production.min.js":
    72  		data, err := graphiql.Assets.ReadFile(filepath.Base(r.URL.Path))
    73  		if err != nil {
    74  			log.Warn("Error loading graphiql asset", "err", err)
    75  			respErr(w, "internal error", http.StatusInternalServerError)
    76  			return
    77  		}
    78  		respOk(w, data, "application/javascript; charset=utf-8")
    79  	default:
    80  		data, err := graphiql.Assets.ReadFile("index.html")
    81  		if err != nil {
    82  			log.Warn("Error loading graphiql asset", "err", err)
    83  			respErr(w, "internal error", http.StatusInternalServerError)
    84  			return
    85  		}
    86  		respOk(w, data, "text/html")
    87  	}
    88  }