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package muxtool
import (
"context"
"encoding/json"
"net/http"
)
// Wrap API handler and returns standard http.HandlerFunc function
func Wrap[RQ any, RS any](handler func(ctx context.Context, request *RQ) (RS, error)) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
req := new(RQ)
richifyRequest(req, r)
switch r.Method {
case http.MethodPost, http.MethodPatch, http.MethodDelete, http.MethodPut:
if err := json.NewDecoder(r.Body).Decode(req); err != nil {
w.WriteHeader(http.StatusBadRequest)
_, _ = w.Write([]byte(err.Error()))
return
}
}
resp, err := handler(r.Context(), req)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
_, _ = w.Write([]byte(err.Error()))
return
}
statusCode := http.StatusOK
contentType := "application/json"
var body []byte
if v, ok := (any)(resp).(WithContentType); ok {
contentType = v.ContentType()
}
if v, ok := (any)(resp).(WithHTTPStatus); ok {
statusCode = v.Status()
}
if v, ok := (any)(resp).(Renderer); ok {
body, err = v.Render()
} else {
body, err = json.Marshal(resp)
}
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
_, _ = w.Write([]byte(err.Error()))
return
}
w.WriteHeader(statusCode)
w.Header().Set("Content-Type", contentType)
w.Write(body)
}
}
func richifyRequest[RQ any](req *RQ, baseRequest *http.Request) {
if v, ok := (any)(req).(WithHeader); ok {
v.WithHeader(baseRequest.Header)
}
if v, ok := (any)(req).(WithMethod); ok {
v.WithMethod(baseRequest.Method)
}
}
type NilRequest struct{}
// Optional interfaces for request type
// WithHeader sets headers to request
type WithHeader interface {
WithHeader(header http.Header)
}
// WithMethod sets method to request
type WithMethod interface {
WithMethod(method string)
}
// Optional interfaces for response type
// Renderer renders response to byte slice
type Renderer interface {
Render() ([]byte, error)
}
// WithContentType returns custom content type for response
type WithContentType interface {
ContentType() string
}
// WithHTTPStatus returns custom status code
type WithHTTPStatus interface {
Status() int
}
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