在Go语言中解析多个XML标签

huangapple
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英文:

Parse multiple XML Tags in Go

问题

我正在尝试解析一个包含以下输出的 sslscan 的 xml 文件。我想用 Go 来解析它。

  1. <document title="SSLScan Results">
  2.   <ssltest host="x.x.x.x" port="443">
  3.     <cipher status="accepted" sslversion="TLSv1.0" bits="256" cipher="DHE-RSA-CAMELLIA256-SHA" dhebits="2048" />
  4.               .
  5.               .
  6.     <cipher status="accepted" sslversion="TLSv1.2" bits="112" cipher="DES-CBC3-SHA" />               .
  7.     <certificate>
  8.       <not-valid-before>Jun 6 00:00:00 2014 GMT</not-valid-before>
  9.       <not-valid-after>Jul 4 23:59:59 2017 GMT</not-valid-after>
  10.     </certificate>
  11.   </ssltest>
  12. </document>

代码：

  1. type XMLStrap struct {
  2.   Status     string `xml:"status,attr"`
  3.   SSLversion string `xml:"sslversion,attr"`
  4.   Bits       string `xml:"bits,attr"`
  5.   Cipher     string `xml:"cipher,attr"`
  6. }
  8. type XMLStraps struct {
  9.   XMLName xml.Name   `xml:"document"`
  10.   Straps  []XMLStrap `xml:"ssltest>cipher"`
  11. }
  13. func ReadStraps(reader io.Reader) ([]XMLStrap, error) {
  14.   var xmlStraps XMLStraps
  15.   if err := xml.NewDecoder(reader).Decode(&xmlStraps); err != nil {
  16.     return nil, err
  17.   }
  18.   return xmlStraps.Straps, nil
  19. }
  21. func main() {
  22.   strapsFilePath, err := filepath.Abs("straps.xml")
  23.   if err != nil {
  24.     fmt.Println(err)
  25.     os.Exit(1)
  26.   }
  28.   file, err := os.Open(strapsFilePath)
  29.   if err != nil {
  30.     fmt.Println(err)
  31.     os.Exit(1)
  32.   }
  34.   defer file.Close()
  36.   xmlStraps, err := ReadStraps(file)
  37.   if err != nil {
  38.     fmt.Println(err)
  39.     os.Exit(1)
  40.   }
  42.   for i := 0; i < len(xmlStraps); i++ {
  43.     fmt.Printf("%s %s %s %s\n", xmlStraps[i].Status, xmlStraps[i].SSLversion, xmlStraps[i].Bits, xmlStraps[i].Cipher)
  44.   }
  45. }

一切都正常工作，但我不知道如何解析 <certificate><not-valid-before> 中的日期，而不创建一个新的 reader。我尝试将前两个结构体更改为：

  1. type XMLStrap struct {
  2.   Status     string `xml:"cipher>status,attr"`
  3.   SSLversion string `xml:"cipher>sslversion,attr"`
  4.   Bits       string `xml:"cipher>bits,attr"`
  5.   Cipher     string `xml:"cipher>cipher,attr"`
  6.   Cert       string `xml:"certificate>not-valid-after,chardata"`
  7. }
  9. type XMLStraps struct {
  10.   XMLName xml.Name   `xml:"document"`
  11.   Straps  []XMLStrap `xml:"ssltest"`
  12. }

但这样不起作用。

xml: cipher>status chain not valid with attr flag exit status 1

显然，在较旧的 Go 版本中，它是可以工作的。

英文:

I'm trying to parse an xml file for sslscan which has the following output (shortened).
I want to parse it with Go.

  1. &lt;document title=&quot;SSLScan Results&quot;&gt;
  2.  &lt;ssltest host=&quot;x.x.x.x&quot; port=&quot;443&quot;&gt;
  3.    &lt;cipher status=&quot;accepted&quot; sslversion=&quot;TLSv1.0&quot; bits=&quot;256&quot; cipher=&quot;DHE-RSA-CAMELLIA256-SHA&quot; dhebits=&quot;2048&quot; /&gt;
  4.              .
  5.              .
  6.    &lt;cipher status=&quot;accepted&quot; sslversion=&quot;TLSv1.2&quot; bits=&quot;112&quot; cipher=&quot;DES-CBC3-SHA&quot; /&gt;               .
  8.   &lt;certificate&gt;
  9.    &lt;not-valid-before&gt;Jun  6 00:00:00 2014 GMT&lt;/not-valid-before&gt;
  10.    &lt;not-valid-after&gt;Jul  4 23:59:59 2017 GMT&lt;/not-valid-after&gt;
  11.   &lt;/certificate&gt;
  12.  &lt;/ssltest&gt;
  13. &lt;/document&gt;

Code:

  1. type XMLStrap struct {
  2.   Status     string `xml:&quot;status,attr&quot;`
  3.   SSLversion string `xml:&quot;sslversion,attr&quot;`
  4.   Bits       string `xml:&quot;bits,attr&quot;`
  5.   Cipher     string `xml:&quot;cipher,attr&quot;`
  6. }
  8. type XMLStraps struct {
  9.   XMLName xml.Name   `xml:&quot;document&quot;`
  10.   Straps  []XMLStrap `xml:&quot;ssltest&gt;cipher&quot;`
  11. }
  13. func ReadStraps(reader io.Reader) ([]XMLStrap, error) {
  14.   var xmlStraps XMLStraps
  15.   if err := xml.NewDecoder(reader).Decode(&amp;xmlStraps); err != nil {
  16. 	return nil, err
  17.   }
  18.   return xmlStraps.Straps, nil
  19. }
  22. func main() {
  23.   strapsFilePath, err := filepath.Abs(&quot;straps.xml&quot;)
  24.   if err != nil {
  25. 	fmt.Println(err)
  26. 	os.Exit(1)
  27.   }
  29.   file, err := os.Open(strapsFilePath)
  30.   if err != nil {
  31. 	fmt.Println(err)
  32. 	os.Exit(1)
  33.   }
  35.   defer file.Close()
  37.   xmlStraps, err := ReadStraps(file)
  38.   if err != nil {
  39. 	fmt.Println(err)
  40. 	os.Exit(1)
  41.   }
  43.   for i := 0; i &lt; len(xmlStraps); i++ {
  44. 	fmt.Printf(&quot;%s %s %s %s\n&quot;, xmlStraps[i].Status,      xmlStraps[i].SSLversion, xmlStraps[i].Bits, xmlStraps[i].Cipher)
  45.   }
  46. }

Everything works fine but I have no idea how to parse the date in &lt;certificate&gt;&lt;not-valid-before&gt; without creating a new reader?

I tried to change the first two structs to

  1. type XMLStrap struct {
  2.   Status     string `xml:&quot;cipher&gt;status,attr&quot;`
  3.   SSLversion string `xml:&quot;cipher&gt;sslversion,attr&quot;`
  4.   Bits       string `xml:&quot;cipher&gt;bits,attr&quot;`
  5.   Cipher     string `xml:&quot;cipher&gt;cipher,attr&quot;`
  6.   Cert       string `xml:&quot;certificate&gt;not-valid-after,chardata&quot;`
  7. }
  9. type XMLStraps struct {
  10.   XMLName xml.Name   `xml:&quot;document&quot;`
  11.   Straps  []XMLStrap `xml:&quot;ssltest&quot;`
  12. }

but this doesn't work.

xml: cipher&gt;status chain not valid with attr flag
exit status 1

Apparently in older versions of Go it worked.

答案1

得分: 0

我不是代码翻译器，但我可以帮你理解这段代码的含义。这段代码定义了一些结构体类型，并实现了一个函数。下面是代码的翻译：

  1. type XMLStrap struct {
  2.     Status     string `xml:"status,attr"`
  3.     SSLversion string `xml:"sslversion,attr"`
  4.     Bits       string `xml:"bits,attr"`
  5.     Cipher     string `xml:"cipher,attr"`
  6.     Valid      string ""
  7. }
  9. type Certs struct {
  10.     Cert string `xml:"not-valid-after"`
  11. }
  13. type XMLStraps struct {
  14.     XMLName    xml.Name   `xml:"document"`
  15.     Straps     []XMLStrap `xml:"ssltest>cipher"`
  16.     Validation Certs      `xml:"ssltest>certificate"`
  17. }
  19. func ReadStraps(reader io.Reader) ([]XMLStrap, error) {
  20.     var xmlStraps XMLStraps
  21.     if err := xml.NewDecoder(reader).Decode(&xmlStraps); err != nil {
  22.         return nil, err
  23.     }
  24.     xmlStraps.Straps[0].Valid = xmlStraps.Validation.Cert
  25.     return xmlStraps.Straps, nil
  26. }

这段代码定义了三个结构体类型：XMLStrap、Certs和XMLStraps。XMLStrap结构体有五个字段，分别是Status、SSLversion、Bits、Cipher和Valid。Certs结构体只有一个字段Cert。XMLStraps结构体包含了一个XMLName字段和两个嵌套的结构体字段Straps和Validation。

ReadStraps函数接收一个io.Reader类型的参数，并返回一个[]XMLStrap类型的切片和一个错误。函数内部首先创建了一个XMLStraps类型的变量xmlStraps，然后使用xml.NewDecoder(reader).Decode(&xmlStraps)将输入的XML数据解码到xmlStraps变量中。最后，将xmlStraps.Validation.Cert赋值给xmlStraps.Straps[0].Valid，并返回xmlStraps.Straps切片和一个可能发生的错误。

希望这能帮到你！如果你有任何其他问题，请随时问我。

英文:

I had to allocate the parameter of a new object to the object which was returned. I tried this before but I did a mistake

  1. type XMLStrap struct {
  2.   Status     string `xml:&quot;status,attr&quot;`
  3.   SSLversion string `xml:&quot;sslversion,attr&quot;`
  4.   Bits       string `xml:&quot;bits,attr&quot;`
  5.   Cipher     string `xml:&quot;cipher,attr&quot;`
  6.   Valid      string &quot;&quot;
  7. }
  9. type Certs struct {
  10.   Cert string `xml:&quot;not-valid-after&quot;`
  11. }
  13. type XMLStraps struct {
  14.   XMLName    xml.Name   `xml:&quot;document&quot;`
  15.   Straps     []XMLStrap `xml:&quot;ssltest&gt;cipher&quot;`
  16.   Validation Certs      `xml:&quot;ssltest&gt;certificate&quot;`
  17. }
  19. func ReadStraps(reader io.Reader) ([]XMLStrap, error) {
  20.   var xmlStraps XMLStraps
  21.   if err := xml.NewDecoder(reader).Decode(&amp;xmlStraps); err != nil {
  22. 	return nil, err
  23.   }
  24.   xmlStraps.Straps[0].Valid = xmlStraps.Validation.Cert
  25.   return xmlStraps.Straps, nil
  26. }

huangapple
  • 本文由 发表于 2015年10月20日 15:49:49
  • 转载请务必保留本文链接：https://go.coder-hub.com/33230936.html
  • go
  • xml
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