github.com/99designs/gqlgen@v0.17.45/graphql/handler/transport/options.go (about)

     1  package transport
     2  
     3  import (
     4  	"net/http"
     5  	"strings"
     6  
     7  	"github.com/99designs/gqlgen/graphql"
     8  )
     9  
    10  // Options responds to http OPTIONS and HEAD requests
    11  type Options struct {
    12  	// AllowedMethods is a list of allowed HTTP methods.
    13  	AllowedMethods []string
    14  }
    15  
    16  var _ graphql.Transport = Options{}
    17  
    18  func (o Options) Supports(r *http.Request) bool {
    19  	return r.Method == "HEAD" || r.Method == "OPTIONS"
    20  }
    21  
    22  func (o Options) Do(w http.ResponseWriter, r *http.Request, exec graphql.GraphExecutor) {
    23  	switch r.Method {
    24  	case http.MethodOptions:
    25  		w.Header().Set("Allow", o.allowedMethods())
    26  		w.WriteHeader(http.StatusOK)
    27  	case http.MethodHead:
    28  		w.WriteHeader(http.StatusMethodNotAllowed)
    29  	}
    30  }
    31  
    32  func (o Options) allowedMethods() string {
    33  	if len(o.AllowedMethods) == 0 {
    34  		return "OPTIONS, GET, POST"
    35  	}
    36  	return strings.Join(o.AllowedMethods, ", ")
    37  }