timoth-y/kicksware-api

package rest

import (
    "net/http"
    "reflect"
    "strconv"
    "strings"
    "unsafe"

    "github.com/fatih/structs"

    "go.kicksware.com/api/services/cdn/core/meta"
)

func ParseOptions(r *http.Request) meta.ImageOptions {
    o := &meta.ImageOptions{}
    query := r.URL.Query()
    properties := structs.Names(o)
    for _, prop := range properties {
        value := query.Get(strings.ToLower(prop))
        if value == "" {
            continue
        }
        field := reflect.ValueOf(o).Elem().FieldByName(prop)
        switch field.Kind().String() {
        case "string":
            setPrivateField(field, value)
        case "int", "float":
            if num, err := strconv.ParseInt(value, 10, 32); err == nil {
                setPrivateField(field, int(num))
            }
        case "bool":
            if sign, err := strconv.ParseBool(value); err == nil {
                setPrivateField(field, sign)
            }
        default:
            setPrivateField(field, value)
        }
    }
    return *o
}

func setPrivateField(field reflect.Value, value interface{}) {
    reflect.NewAt(field.Type(), unsafe.Pointer(field.UnsafeAddr())).
        Elem().
        Set(reflect.ValueOf(value))
}