wip modernize code base

envconfig.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+	"net/url"
+	"strings"
+)
+
+func (cp *CertPool) Decode(value string) error {
+	*cp = CertPool{x509.NewCertPool()}
+	caPEM, err := ioutil.ReadFile(value)
+	if err != nil {
+		return fmt.Errorf("unable to open CA file: %w", err)
+	}
+	ok := cp.AppendCertsFromPEM(caPEM)
+	if !ok {
+		return fmt.Errorf("unable to parse CA")
+	}
+	return nil
+}
+
+func (cl *CertList) Decode(value string) error {
+	crlData, err := ioutil.ReadFile(value)
+	if err != nil {
+		return fmt.Errorf("unable to open CRL file: %w", err)
+	}
+	crl, err := x509.ParseCRL(crlData)
+	if err != nil {
+		return fmt.Errorf("unable to parse CRL file: %w", err)
+	}
+	*cl = CertList{crl}
+	return nil
+}
+
+func (t *Targets) Decode(value string) error {
+	splitted := strings.Split(value, ",")
+	*t = Targets{
+		targets: make([]*url.URL, len(splitted)),
+	}
+	for i, urlString := range splitted {
+		u, err := url.Parse(urlString)
+		if err != nil {
+			return err
+		}
+		t.targets[i] = u
+	}
+	return nil
+}