This is a simple wrapper to the json and xml Marshallers with some filter capabilities. Unlike 'render' package it doesn't write anything, just returns marshalled byte array.
E.g.:
type Some struct {
Login string `json:"login"`
Password string `json:"password,omitempty"`
Avatar string `json:"avatar"`
}
// Adding Filter method
func (this Some) Filter() interface{} {
this.Password = "" // will be omitted in Marshaller
this.Avatar = "http://some-origin/" + this.Login
return this
}Filter method will be invoked automatically. If a slice or an array passed, for each Some structure in slice.
package main
import (
"github.com/go-martini/martini"
"github.com/martini-contrib/encoder"
"log"
"net/http"
"strconv"
)
type Some struct {
Login string `json:"login"`
Password string `json:"password,omitempty" xml:",omitempty"`
Url string `json:"url"`
}
func (this Some) Filter() interface{} {
this.Password = ""
this.Url = "http://some-origin/" + this.Login
return this
}
func init() {
log.SetFlags(log.Lshortfile)
}
func main() {
m := martini.New()
route := martini.NewRouter()
m.Use(func(c martini.Context, w http.ResponseWriter, r *http.Request) {
// Use indentations. &pretty=1
pretty, _ := strconv.ParseBool(r.FormValue("pretty"))
// Use null instead of empty object for json &null=1
null, _ := strconv.ParseBool(r.FormValue("null"))
// Some content negotiation
switch r.Header.Get("Content-Type") {
case "application/xml":
c.MapTo(encoder.XmlEncoder{PrettyPrint: pretty}, (*encoder.Encoder)(nil))
w.Header().Set("Content-Type", "application/xml; charset=utf-8")
default:
c.MapTo(encoder.JsonEncoder{PrettyPrint: pretty, PrintNull: null}, (*encoder.Encoder)(nil))
w.Header().Set("Content-Type", "application/json; charset=utf-8")
}
})
route.Get("/user", func(enc encoder.Encoder) (int, []byte) {
result := Some{"user1", "passwordhash", "/user1"}
return http.StatusOK, encoder.Must(enc.Encode(result))
})
route.Get("/users", func(enc encoder.Encoder) (int, []byte) {
result := []Some{
Some{"user1", "somehash", "/user1"},
Some{"user2", "somehash", "/user2"},
}
return http.StatusOK, encoder.Must(enc.Encode(result))
})
m.Action(route.Handle)
log.Println("Waiting for connections...")
if err := http.ListenAndServe(":8000", m); err != nil {
log.Fatal(err)
}
}So, the result will be as follows:
~ curl -XGET http://localhost:8000/users\?pretty\=1\&null\=1
[
{
"login": "user1",
"url": "http://some-origin/user1"
},
{
"login": "user2",
"url": "http://some-origin/user2"
}
]
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