/
main.go
448 lines (382 loc) · 9.45 KB
/
main.go
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// Package plist provides an API for reading Apple property lists.
package plist
import (
"bytes"
"encoding/base64"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"strconv"
"time"
)
// Plist represents a property list.
type Plist struct {
Version string
Root interface{}
}
// Dict represents a property list "dict" element.
type Dict map[string]interface{}
// Array represents a property list "array" element.
type Array []interface{}
// A Decoder represents a plist parser reading from a stream.
type Decoder struct {
xd *xml.Decoder
}
// NewDecoder creates a Decoder for a given Reader.
func NewDecoder(r io.Reader) *Decoder {
d := new(Decoder)
d.xd = xml.NewDecoder(r)
return d
}
// Unmarshal parses a Plist out of a given array of bytes.
func Unmarshal(data []byte, v *Plist) error {
dec := NewDecoder(bytes.NewBuffer(data))
return dec.Decode(v)
}
// UnmarshalFile loads a file and parses a Plist from the loaded data.
// If the file is a binary plist, the plutil system command is used to convert
// it to XML text.
func UnmarshalFile(filename string) (*Plist, error) {
xmlFile, err := os.Open(filename)
if err != nil {
return nil, fmt.Errorf("plist: error opening plist: %s", err)
}
defer xmlFile.Close()
xmlData, err := ioutil.ReadAll(xmlFile)
if err != nil {
return nil, fmt.Errorf("plist: error reading plist file: %s", err)
}
if !bytes.HasPrefix(xmlData, []byte("<?xml ")) {
debug("non-text XML -- assuming binary")
xmlData, err = exec.Command("plutil", "-convert", "xml1", "-o", "-",
filename).Output()
if err != nil || !bytes.HasPrefix(xmlData, []byte("<?xml ")) {
return nil, fmt.Errorf("plist: invalid plist file " + filename)
}
}
var plist Plist
err = Unmarshal(xmlData, &plist)
if err != nil {
return nil, err
}
return &plist, err
}
// Decode executes the Decoder to fill in a Plist structure.
func (d *Decoder) Decode(v *Plist) error {
start, err := d.decodeStartElement("plist")
if err != nil {
return err
}
if len(start.Attr) != 1 || start.Attr[0].Name.Local != "version" {
return fmt.Errorf("plist: missing version")
}
v.Version = start.Attr[0].Value
// Start element of plist content
se, ee, err := d.decodeStartOrEndElement("", *start)
if err != nil {
return err
}
if ee != nil {
// empty plist
debug("empty plist")
return nil
}
switch se.Name.Local {
case "dict":
d, err := d.decodeDict(*se)
if err != nil {
return err
}
debug("read dict: %s", d)
v.Root = d
case "array":
a, err := d.decodeArray(*se)
if err != nil {
return err
}
debug("read array: %s", a)
v.Root = a
default:
return fmt.Errorf("plist: bad root element: must be dict or array")
}
return err
}
func (d *Decoder) nextElement() (xml.Token, error) {
for {
t, err := d.xd.Token()
if err != nil {
return nil, err
}
switch t.(type) {
case xml.StartElement, xml.EndElement:
return t, nil
}
}
return nil, nil
}
func (d *Decoder) decodeValue(se *xml.StartElement) (val interface{}, err error) {
switch se.Name.Local {
case "dict":
val, err = d.decodeDict(*se)
case "array":
val, err = d.decodeArray(*se)
case "true":
val = true
_, err = d.nextElement()
case "false":
val = false
_, err = d.nextElement()
case "date":
val, err = d.decodeDate(*se)
case "data":
val, err = d.decodeData(*se)
case "string":
val, err = d.decodeString(*se)
case "real":
val, err = d.decodeReal(*se)
case "integer":
val, err = d.decodeInteger(*se)
}
return val, err
}
func (d *Decoder) decodeDict(start xml.StartElement) (Dict, error) {
trace("reading dict")
dictMap := map[string]interface{}{}
// <key>
se, end, err := d.decodeStartOrEndElement("key", start)
if err != nil {
return nil, err
}
if end != nil {
// empty dict
return nil, nil
}
for {
// read key name
keyName, err := d.decodeString(*se)
if err != nil {
return nil, err
}
// read start element
se, err := d.decodeStartElement("")
if err != nil {
return nil, err
}
// decode the element value
val, err := d.decodeValue(se)
if err != nil {
return nil, err
}
dictMap[keyName] = val
// get the next key
se, end, err = d.decodeStartOrEndElement("key", start)
if err != nil {
return nil, err
}
if end != nil {
// end of list
break
}
}
trace("filled in dictMap: %s", dictMap)
return dictMap, nil
}
func (d *Decoder) decodeArray(start xml.StartElement) (Array, error) {
trace("reading array")
var slice []interface{}
se, ee, err := d.decodeStartOrEndElement("", start)
if err != nil {
return nil, err
}
if ee != nil {
// empty array
return nil, nil
}
for {
// decode the current value
val, err := d.decodeValue(se)
if err != nil {
return nil, err
}
slice = append(slice, val)
// get the next value
se, ee, err = d.decodeStartOrEndElement("", start)
if err != nil {
return nil, err
}
if ee != nil {
// end of array
break
}
}
return slice, nil
}
func (d *Decoder) decodeAny(start xml.StartElement) (xml.Token, error) {
t, err := d.xd.Token()
if err != nil {
return nil, fmt.Errorf("plist: error reading token: %s", err)
}
end, ok := t.(xml.EndElement)
if ok {
if end.Name.Local != start.Name.Local {
return nil, fmt.Errorf("plist: unexpected end tag: %s", end.Name.Local)
}
// empty
return nil, nil
}
tok := xml.CopyToken(t)
next, err := d.nextElement()
if err != nil {
return nil, fmt.Errorf("plist: error reading token: %s", err)
}
end, ok = next.(xml.EndElement)
if !ok || end.Name.Local != start.Name.Local {
// empty
return nil, fmt.Errorf("plist: unexpected end tag: %s", end.Name.Local)
}
return tok, nil
}
func (d *Decoder) decodeString(start xml.StartElement) (string, error) {
t, err := d.decodeAny(start)
if err != nil {
return "", err
}
if t == nil {
trace("read empty string")
return "", nil
}
cd, ok := t.(xml.CharData)
if !ok {
return "", fmt.Errorf("plist: expected character data")
}
trace("read string '%s'", string(cd))
return string(cd), nil
}
func (d *Decoder) decodeNonEmptyString(start xml.StartElement) (string, error) {
str, err := d.decodeString(start)
if err != nil {
return str, err
}
if len(str) == 0 {
return str, fmt.Errorf("plist: expected non-empty string")
}
return str, nil
}
func (d *Decoder) decodeInteger(start xml.StartElement) (int64, error) {
str, err := d.decodeNonEmptyString(start)
if err != nil {
return 0, err
}
trace("read integer: %s", str)
val, err := strconv.ParseInt(str, 10, 64)
if err != nil {
return 0, fmt.Errorf("plist: invalid integer value '%s'", str)
}
return val, nil
}
func (d *Decoder) decodeReal(start xml.StartElement) (float64, error) {
str, err := d.decodeNonEmptyString(start)
if err != nil {
return 0, err
}
trace("read real: %s", str)
val, err := strconv.ParseFloat(str, 64)
if err != nil {
return 0, fmt.Errorf("plist: invalid float value '%s'", str)
}
return val, nil
}
func (d *Decoder) decodeDate(start xml.StartElement) (time.Time, error) {
str, err := d.decodeNonEmptyString(start)
if err != nil {
return time.Time{}, err
}
trace("read date: %s", str)
t, err := time.Parse(time.RFC3339, str)
if err != nil {
return time.Time{}, fmt.Errorf("plist: invalid date value '%s'", str)
}
return t, nil
}
func (d *Decoder) decodeData(start xml.StartElement) ([]byte, error) {
trace("reading data")
str, err := d.decodeString(start)
if err != nil {
return nil, err
}
if str == "" {
return nil, nil
}
trace("read data: %s", str)
data, err := base64.StdEncoding.DecodeString(str)
if err != nil {
return nil, fmt.Errorf("plist: error decoding data '%s'", str)
}
return data, nil
}
func (d *Decoder) decodeStartElement(expected string) (*xml.StartElement, error) {
trace("reading start element '%s'", expected)
t, err := d.nextElement()
if err != nil {
return nil, err
}
se, ok := t.(xml.StartElement)
if !ok {
return nil, fmt.Errorf("plist: expected StartElement, saw %T", t)
}
if expected != "" && se.Name.Local != expected {
return nil, fmt.Errorf("plist: unexpected key name '%s'", se.Name.Local)
}
return &se, nil
}
func (d *Decoder) decodeEndElement(expected string) (*xml.EndElement, error) {
trace("reading end element '%s'", expected)
t, err := d.nextElement()
if err != nil {
return nil, err
}
ee, ok := t.(xml.EndElement)
if !ok {
return nil, fmt.Errorf("plist: expected EndElement")
}
if expected != "" && ee.Name.Local != expected {
return nil, fmt.Errorf("bad key name")
}
trace(" read element '%s'", ee)
return &ee, nil
}
func (d *Decoder) decodeStartOrEndElement(expected string, start xml.StartElement) (
*xml.StartElement, *xml.EndElement, error) {
trace("reading start element '%s' or end element", expected)
t, err := d.nextElement()
if err != nil {
return nil, nil, err
}
se, ok := t.(xml.StartElement)
if !ok {
ee, ok := t.(xml.EndElement)
if ok {
if ee.Name.Local == start.Name.Local {
trace(" read end element '%s'", ee)
return nil, &ee, nil
}
return nil, nil, fmt.Errorf("plist: unexpected end element '%s'", ee.Name.Local)
}
return nil, nil, fmt.Errorf("plist: expected StartElement, saw %T", se)
}
if expected != "" && se.Name.Local != expected {
return nil, nil, fmt.Errorf("plist: unexpected key name '%s'", se.Name.Local)
}
trace(" read start element '%s'", se)
return &se, nil, nil
}
// support /////////////////////////////////////////////////////////////
func debug(format string, args ...interface{}) {
// log.Printf(format, args...)
}
func trace(format string, args ...interface{}) {
// log.Printf(format, args...)
}