/
retencoder.go
52 lines (47 loc) · 1.47 KB
/
retencoder.go
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package retencoder
import (
"encoding/json"
"encoding/xml"
"fmt"
"net/http"
"reflect"
"strings"
"github.com/codegangsta/inject"
"github.com/codegangsta/martini"
)
// ReturnHandler is a service that is called when a route handler returns
// something. The ReturnHandler is responsible for writing to the
// ResponseWriter based on the values that are passed into this function.
func ReturnHandler() martini.ReturnHandler {
return func(ctx martini.Context, vals []reflect.Value) {
rv := ctx.Get(reflect.TypeOf((*http.Request)(nil)))
req := rv.Interface().(*http.Request)
acceptType := req.Header.Get("Accept")
rv = ctx.Get(inject.InterfaceOf((*http.ResponseWriter)(nil)))
res := rv.Interface().(http.ResponseWriter)
var responseVal reflect.Value
if len(vals) > 1 && vals[0].Kind() == reflect.Int {
res.WriteHeader(int(vals[0].Int()))
responseVal = vals[1]
} else if len(vals) > 0 {
responseVal = vals[0]
}
if strings.Contains(acceptType, "json") {
res.Header().Set("Content-Type", "application/json; charset=utf-8")
data, err := json.Marshal(responseVal.Interface())
if err == nil {
res.Write(data)
}
} else if strings.Contains(acceptType, "xml") {
res.Header().Set("Content-Type", "application/xml; charset=utf-8")
data, err := xml.Marshal(responseVal.Interface())
if err == nil {
res.Write(data)
}
} else {
if stringer, ok := responseVal.Interface().(fmt.Stringer); ok {
res.Write([]byte(stringer.String()))
}
}
}
}