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auto.go
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auto.go
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package codec
import (
"bytes"
"encoding/binary"
"html"
"net/url"
"regexp"
"strconv"
"strings"
"unicode/utf8"
"github.com/asaskevich/govalidator"
)
type AutoDecodeResult struct {
Type string
TypeVerbose string
Origin string
Result string
}
var jsonUnicodeRegexp = regexp.MustCompile(`(?i)\\u[\dabcdef]{4}`)
var base64Regexp = regexp.MustCompile(`(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})`)
var urlRegexp = regexp.MustCompile(`%[\da-fA-F]{2}`)
var htmlEntityRegexp = regexp.MustCompile(`^((&[a-zA-Z]+;)|(&#[a-fA-F0-9]+;))+$`)
var hexRegexp = regexp.MustCompile(`^\b([0-9A-Fa-f]{2}\s?)+[0-9A-Fa-f]{2}\b$`)
var base32Regexp = regexp.MustCompile(`^([A-Z2-7]{8})*([A-Z2-7]{8}|[A-Z2-7]{2}([A-Z2-7]{6})*|[A-Z2-7]{4}([A-Z2-7]{4})*|[A-Z2-7]{5}([A-Z2-7]{3})*|[A-Z2-7]{7})(=){0,6}$`)
func AutoDecode(i interface{}) []*AutoDecodeResult {
rawBytes := interfaceToBytes(i)
rawStr := string(rawBytes)
var results []*AutoDecodeResult
var origin = rawStr
for i := 0; i < 100; i++ {
// urlencode
if r := urlRegexp.MatchString(rawStr); r {
rawStr, _ = url.QueryUnescape(rawStr)
if rawStr != "" {
results = append(results, &AutoDecodeResult{
Type: "UrlDecode",
TypeVerbose: "URL解码",
Origin: origin,
Result: rawStr,
})
origin = rawStr
continue
}
}
// html entity encode
if r := htmlEntityRegexp.MatchString(rawStr); r {
rawStr = html.UnescapeString(rawStr)
if rawStr != "" {
results = append(results, &AutoDecodeResult{
Type: "Html Entity Decode",
TypeVerbose: "Html Entity 解码",
Origin: origin,
Result: rawStr,
})
origin = rawStr
continue
}
}
// hex
if hexRegexp.MatchString(rawStr) {
rawStr = hexRegexp.ReplaceAllStringFunc(rawStr, func(s string) string {
result, err := DecodeHex(strings.ReplaceAll(s, " ", ""))
if err != nil {
return s
}
for _, ch := range []rune(string(result)) {
if !strconv.IsPrint(ch) {
return s
}
}
return EscapeInvalidUTF8Byte(result)
})
if rawStr != "" && rawStr != origin {
results = append(results, &AutoDecodeResult{
Type: "Hex Decode",
TypeVerbose: "Hex 解码",
Origin: origin,
Result: rawStr,
})
origin = rawStr
continue
}
}
// json-unicode
if r := jsonUnicodeRegexp.MatchString(rawStr); r {
rawStr = jsonUnicodeRegexp.ReplaceAllStringFunc(rawStr, func(s string) string {
number, err := DecodeHex(strings.TrimLeft(s, "\\u"))
if err != nil {
return s
}
return string(rune(binary.BigEndian.Uint16(number)))
})
if rawStr != "" {
results = append(results, &AutoDecodeResult{
Type: "Json Unicode Decode",
TypeVerbose: "Json Unicode 解码",
Origin: origin,
Result: rawStr,
})
origin = rawStr
continue
}
}
// base64
if govalidator.IsBase64(rawStr) {
rawStr = base64Regexp.ReplaceAllStringFunc(rawStr, func(s string) string {
result, err := DecodeBase64(s)
if err != nil {
return s
}
for _, ch := range []rune(string(result)) {
if !strconv.IsPrint(ch) {
return s
}
}
return EscapeInvalidUTF8Byte(result)
})
if rawStr != "" && rawStr != origin {
results = append(results, &AutoDecodeResult{
Type: "Base64 Decode",
TypeVerbose: "Base64 解码",
Origin: origin,
Result: rawStr,
})
origin = rawStr
continue
}
}
// base32
if base32Regexp.MatchString(rawStr) {
rawStr = base32Regexp.ReplaceAllStringFunc(rawStr, func(s string) string {
result, err := DecodeBase32(s)
if err != nil {
return s
}
for _, ch := range []rune(string(result)) {
if !strconv.IsPrint(ch) {
return s
}
}
return EscapeInvalidUTF8Byte(result)
})
if rawStr != "" && rawStr != origin {
results = append(results, &AutoDecodeResult{
Type: "Base32 Decode",
TypeVerbose: "Base32 解码",
Origin: origin,
Result: rawStr,
})
origin = rawStr
continue
}
}
// base64 with urlencode
decodedByBas64, err := DecodeBase64Url(rawStr)
if len(decodedByBas64) > 0 && err == nil {
if utf8.Valid(decodedByBas64) {
results = append(results, &AutoDecodeResult{
Type: "Base64 Decode",
TypeVerbose: "Base64 解码",
Origin: origin,
Result: string(decodedByBas64),
})
origin = rawStr
rawStr = string(decodedByBas64)
continue
}
decoded, err := GB18030ToUtf8(decodedByBas64)
if err == nil && len(decoded) > 0 {
results = append(results, &AutoDecodeResult{
Type: "Base64 Decode",
TypeVerbose: "Base64 解码(UTF8-Invalid)",
Origin: origin,
Result: EscapeInvalidUTF8Byte(decodedByBas64),
})
origin = rawStr
results = append(results, &AutoDecodeResult{
Type: "GB(K/18030) Decode",
TypeVerbose: "GB(K/18030) 解码",
Origin: origin,
Result: EscapeInvalidUTF8Byte(decoded),
})
origin = rawStr
rawStr = string(decoded)
continue
}
}
// jwt
if strings.Count(rawStr, ".") > 1 {
var blocks = strings.Split(rawStr, ".")
var buf bytes.Buffer
var failed = false
for index, i := range blocks {
base64Decoded, _ := DecodeBase64(i)
if len(base64Decoded) <= 0 {
failed = true
break
}
if govalidator.IsPrintableASCII(string(base64Decoded)) {
buf.WriteString(EscapeInvalidUTF8Byte(base64Decoded))
} else {
buf.WriteString(i)
}
if index != len(blocks)-1 {
buf.WriteByte('.')
}
}
if failed {
continue
}
rawStr = buf.String()
if rawStr != "" && rawStr != origin {
results = append(results, &AutoDecodeResult{
Type: "jwt",
TypeVerbose: "JWT",
Origin: origin,
Result: rawStr,
})
origin = rawStr
continue
}
}
if rawStr == origin {
break
}
}
if len(results) <= 0 {
return []*AutoDecodeResult{
{
Type: "No",
TypeVerbose: "无编码",
Origin: rawStr,
Result: rawStr,
},
}
}
return results
}