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package exhttp
import "net/http"
type ErrorBodyGenerators struct {
NotFound func() []byte
MethodNotAllowed func() []byte
}
func HandleErrors(next http.Handler, gen ErrorBodyGenerators) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
next.ServeHTTP(&bodyOverrider{
ResponseWriter: w,
statusNotFoundBodyGenerator: gen.NotFound,
statusMethodNotAllowedBodyGenerator: gen.MethodNotAllowed,
}, r)
})
}
type bodyOverrider struct {
http.ResponseWriter
code int
override bool
statusNotFoundBodyGenerator func() []byte
statusMethodNotAllowedBodyGenerator func() []byte
}
var _ http.ResponseWriter = (*bodyOverrider)(nil)
func (b *bodyOverrider) WriteHeader(code int) {
if b.Header().Get("Content-Type") == "text/plain; charset=utf-8" {
b.Header().Set("Content-Type", "application/json")
b.override = true
}
b.code = code
b.ResponseWriter.WriteHeader(code)
}
func (b *bodyOverrider) Write(body []byte) (int, error) {
if b.override {
switch b.code {
case http.StatusNotFound:
if b.statusNotFoundBodyGenerator != nil {
body = b.statusNotFoundBodyGenerator()
}
case http.StatusMethodNotAllowed:
if b.statusMethodNotAllowedBodyGenerator != nil {
body = b.statusMethodNotAllowedBodyGenerator()
}
}
}
return b.ResponseWriter.Write(body)
}
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