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|
package main
import (
"crypto/x509"
"encoding/pem"
"fmt"
"html/template"
"io/ioutil"
"os"
"./util"
)
func handleErr(err error, str string, a ...interface{}) {
a = append([]interface{}{err}, a...)
if err != nil {
fmt.Fprintf(os.Stderr, str, a...)
os.Exit(1)
}
}
func handleBool(ok bool, str string, a ...interface{}) {
if !ok {
fmt.Fprintf(os.Stderr, str, a...)
os.Exit(1)
}
}
var tmpl = template.Must(template.New("pem2html").
Funcs(template.FuncMap{
"htmlcell": util.HTMLCellEscapeString,
}).Parse(`<table class=diff>
<tr class="diff-del"><td colspan=4>--- tls.pem</td></tr>
<tr class="diff-add"><td colspan=4>+++ crtsh.pem</td></tr>
<tr class="diff-dat"><td colspan=4>@@ -1,{{.nTLS}} +1,{{.nCrtSh}} @@</td></tr>
{{range $cert := .certs}}
<tr class={{$cert.Class}}>
<td><a href="{{$cert.Url}}">{{$cert.Pfix | htmlcell}}</a></td>
<td><a href="{{$cert.Url}}">{{$cert.X509.Subject.CommonName | htmlcell}}</a></td>
<td><a href="{{$cert.Url}}">{{$cert.X509.NotBefore.Local.Format "2006-01-02 15:04:05"}}</a></td>
<td><a href="{{$cert.Url}}">{{$cert.X509.NotAfter.Local.Format "2006-01-02 15:04:05"}}</a></td>
</tr>
{{end}}
</table>
`))
type Cert struct {
Url string
action string
X509 *x509.Certificate
}
func (cert Cert) Pfix() string {
return map[string]string{
"add": "+",
"del": "-",
"ctx": " ",
}[cert.action]
}
func (cert Cert) Class() string {
return "diff-" + cert.action
}
func main() {
data, err := ioutil.ReadAll(os.Stdin)
handleErr(err, "Error reading stdin: %v\n")
var certs []Cert
a := 0
b := 0
for len(data) > 0 {
var certPem *pem.Block
certPem, data = pem.Decode(data)
var ok bool
var cert Cert
cert.Url, ok = certPem.Headers["X-Crt-Sh-Url"]
handleBool(ok, "Did not get X-Crt-Sh-Url\n")
cert.action, ok = certPem.Headers["X-Diff-Action"]
handleBool(ok, "Did not get X-Diff-Action\n")
switch cert.action {
case "add":
b++
case "del":
a++
case "ctx":
a++
b++
default:
handleBool(false, "Unknown X-Diff-Action: %q\n", cert.action)
}
cert.X509, err = x509.ParseCertificate(certPem.Bytes)
if err != nil {
cert.X509 = new(x509.Certificate)
}
certs = append(certs, cert)
}
handleErr(tmpl.Execute(os.Stdout, map[string]interface{}{
"certs": certs,
"nTLS": a,
"nCrtSh": b,
}), "Could not execute template: %v\n")
}
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