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package relay
import (
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
graphql "github.com/graph-gophers/graphql-go"
)
func MarshalID(kind string, spec interface{}) graphql.ID {
d, err := json.Marshal(spec)
if err != nil {
panic(fmt.Errorf("relay.MarshalID: %s", err))
}
return graphql.ID(base64.URLEncoding.EncodeToString(append([]byte(kind+":"), d...)))
}
func UnmarshalKind(id graphql.ID) string {
s, err := base64.URLEncoding.DecodeString(string(id))
if err != nil {
return ""
}
i := strings.IndexByte(string(s), ':')
if i == -1 {
return ""
}
return string(s[:i])
}
func UnmarshalSpec(id graphql.ID, v interface{}) error {
s, err := base64.URLEncoding.DecodeString(string(id))
if err != nil {
return err
}
i := strings.IndexByte(string(s), ':')
if i == -1 {
return errors.New("invalid graphql.ID")
}
return json.Unmarshal([]byte(s[i+1:]), v)
}
type Handler struct {
Schema *graphql.Schema
}
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var params struct {
Query string `json:"query"`
OperationName string `json:"operationName"`
Variables map[string]interface{} `json:"variables"`
}
if err := json.NewDecoder(r.Body).Decode(¶ms); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
response := h.Schema.Exec(r.Context(), params.Query, params.OperationName, params.Variables)
responseJSON, err := json.Marshal(response)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(responseJSON)
}