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// A facebook graph api client in go.
// https://github.com/huandu/facebook/
//
// Copyright 2012 - 2015, Huan Du
// Licensed under the MIT license
// https://github.com/huandu/facebook/blob/master/LICENSE
package facebook
import (
"encoding/json"
"io"
"mime/multipart"
"net/url"
"os"
"reflect"
"runtime"
)
// Makes a new Params instance by given data.
// Data must be a struct or a map with string keys.
// MakeParams will change all struct field name to lower case name with underscore.
// e.g. "FooBar" will be changed to "foo_bar".
//
// Returns nil if data cannot be used to make a Params instance.
func MakeParams(data interface{}) (params Params) {
if p, ok := data.(Params); ok {
return p
}
defer func() {
if r := recover(); r != nil {
if _, ok := r.(runtime.Error); ok {
panic(r)
}
params = nil
}
}()
params = makeParams(reflect.ValueOf(data))
return
}
func makeParams(value reflect.Value) (params Params) {
for value.Kind() == reflect.Ptr || value.Kind() == reflect.Interface {
value = value.Elem()
}
// only map with string keys can be converted to Params
if value.Kind() == reflect.Map && value.Type().Key().Kind() == reflect.String {
params = Params{}
for _, key := range value.MapKeys() {
params[key.String()] = value.MapIndex(key).Interface()
}
return
}
if value.Kind() != reflect.Struct {
return
}
params = Params{}
num := value.NumField()
for i := 0; i < num; i++ {
name := camelCaseToUnderScore(value.Type().Field(i).Name)
field := value.Field(i)
for field.Kind() == reflect.Ptr {
field = field.Elem()
}
switch field.Kind() {
case reflect.Chan, reflect.Func, reflect.UnsafePointer, reflect.Invalid:
// these types won't be marshalled in json.
params = nil
return
default:
params[name] = field.Interface()
}
}
return
}
// Encodes params to query string.
// If map value is not a string, Encode uses json.Marshal() to convert value to string.
//
// Encode will panic if Params contains values that cannot be marshalled to json string.
func (params Params) Encode(writer io.Writer) (mime string, err error) {
if params == nil || len(params) == 0 {
mime = _MIME_FORM_URLENCODED
return
}
// check whether params contains any binary data.
hasBinary := false
for _, v := range params {
typ := reflect.TypeOf(v)
if typ == typeOfPointerToBinaryData || typ == typeOfPointerToBinaryFile {
hasBinary = true
break
}
}
if hasBinary {
return params.encodeMultipartForm(writer)
}
return params.encodeFormUrlEncoded(writer)
}
func (params Params) encodeFormUrlEncoded(writer io.Writer) (mime string, err error) {
var jsonStr []byte
written := false
for k, v := range params {
if written {
io.WriteString(writer, "&")
}
io.WriteString(writer, url.QueryEscape(k))
io.WriteString(writer, "=")
if reflect.TypeOf(v).Kind() == reflect.String {
io.WriteString(writer, url.QueryEscape(reflect.ValueOf(v).String()))
} else {
jsonStr, err = json.Marshal(v)
if err != nil {
return
}
io.WriteString(writer, url.QueryEscape(string(jsonStr)))
}
written = true
}
mime = _MIME_FORM_URLENCODED
return
}
func (params Params) encodeMultipartForm(writer io.Writer) (mime string, err error) {
w := multipart.NewWriter(writer)
defer func() {
w.Close()
mime = w.FormDataContentType()
}()
for k, v := range params {
switch value := v.(type) {
case *binaryData:
var dst io.Writer
dst, err = w.CreateFormFile(k, value.Filename)
if err != nil {
return
}
_, err = io.Copy(dst, value.Source)
if err != nil {
return
}
case *binaryFile:
var dst io.Writer
var file *os.File
var path string
dst, err = w.CreateFormFile(k, value.Filename)
if err != nil {
return
}
if value.Path == "" {
path = value.Filename
} else {
path = value.Path
}
file, err = os.Open(path)
if err != nil {
return
}
_, err = io.Copy(dst, file)
if err != nil {
return
}
default:
var dst io.Writer
var jsonStr []byte
dst, err = w.CreateFormField(k)
if reflect.TypeOf(v).Kind() == reflect.String {
io.WriteString(dst, reflect.ValueOf(v).String())
} else {
jsonStr, err = json.Marshal(v)
if err != nil {
return
}
_, err = dst.Write(jsonStr)
if err != nil {
return
}
}
}
}
return
}
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