user_context.go

import (
	"context"
	"net/http"
)

type key int

var contextKey = key(22)

func SetUser(usr *User, r *http.Request) {
	ctx := r.Context()
	ctx = context.WithValue(ctx, contextKey, usr)
	*r = *(r.WithContext(ctx))
}

func FromContext(r *http.Request) (*User, bool) {
	usr, ok := r.Context().Value(contextKey).(*User)
	return usr, ok
}