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-rw-r--r--diff-pem2html.go144
1 files changed, 144 insertions, 0 deletions
diff --git a/diff-pem2html.go b/diff-pem2html.go
new file mode 100644
index 0000000..8f3b1e9
--- /dev/null
+++ b/diff-pem2html.go
@@ -0,0 +1,144 @@
+package main
+
+import (
+ "crypto/x509"
+ "encoding/pem"
+ "fmt"
+ "html/template"
+ "io/ioutil"
+ "os"
+)
+
+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("2html").Parse(`<!DOCTYPE html>
+<html lang="en">
+<head>
+ <meta charset="utf-8">
+ <title>CT log accuracy</title>
+ <style>
+ html {
+ height: 100%;
+ }
+ body {
+ font-size: 10px;
+ font-family: monospace;
+ height: 100%;
+ margin: 0;
+ display: flex;
+ align-items: center;
+ }
+ body > * {
+ margin: auto;
+ }
+ .diff-del, .diff-del a { color: red; }
+ .diff-add, .diff-add a { color: green; }
+ .diff-dat, .diff-dat a { color: blue; }
+ .diff-ctx, .diff-ctx a { color: black; }
+ tr:hover a {
+ background-color: #AAAAF3;
+ }
+ td a {
+ text-decoration: none;
+ padding: 0.1em 0.25em;
+ display: block;
+ width: 100%;
+ height: 100%;
+ color: black;
+ }
+ </style>
+ <script src="sorttable.js"></script>
+ <base target="_parent" />
+</head>
+<body>
+<table>
+ <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}}">{{if eq $cert.Pfix " "}}&nbsp;{{else}}{{$cert.Pfix}}{{end}}</a></td>
+ <td><a href="{{$cert.Url}}">{{$cert.X509.Subject.CommonName}}</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>
+</body>
+</html>
+`))
+
+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)
+ handleErr(err, "Error parsing cert: %v\n")
+
+ certs = append(certs, cert)
+ }
+
+ handleErr(tmpl.Execute(os.Stdout, map[string]interface{}{
+ "certs":certs,
+ "nTLS": a,
+ "nCrtSh": b,
+ }), "Could not execute template: %v\n")
+}