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middleware.go
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middleware.go
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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"reflect"
)
func commonHeaders(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
next.ServeHTTP(w, r)
})
}
type errorHandlingMarshalFunc func(w http.ResponseWriter, r *http.Request) (interface{}, error)
func errorHandler(next errorHandlingMarshalFunc) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
result, err := next(w, r)
if err != nil {
log.Println(err)
w.WriteHeader(http.StatusInternalServerError)
return
}
if r.Method != http.MethodOptions && (result == nil || (reflect.TypeOf(result).Kind() == reflect.Slice && reflect.ValueOf(result).Len() == 0)) {
w.WriteHeader(http.StatusNotFound)
fmt.Fprint(w, []interface{}{})
return
}
response, err := json.Marshal(result)
if err != nil {
log.Println(err)
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Write(response)
})
}