add functions to support new deployments

cmd/dkl-local-server/render-context.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"crypto/sha1"
 	"crypto/sha256"
+	"encoding/base64"
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
@@ -184,6 +185,10 @@ func (ctx *renderContext) TemplateFuncs() map[string]any {
 	}
 
 	for name, method := range map[string]any{
+		"base64": func(input string) string {
+			enc := base64.StdEncoding.WithPadding(base64.NoPadding)
+			return enc.EncodeToString([]byte(input))
+		},
 		"host_ip": func() (s string) {
 			return ctx.Host.IPs[0]
 		},
@@ -236,6 +241,10 @@ func (ctx *renderContext) TemplateFuncs() map[string]any {
 				Content: string(userCA),
 			}})
 		},
+		"ssh_user_ca_pub": func(cluster string) (s string, err error) {
+			userCA, err := sshCAPubKey(cluster)
+			return string(userCA), err
+		},
 		"ssh_host_keys": func(dir, cluster, host string) (s string, err error) {
 			if host == "" {
 				host = ctx.Host.Name
@@ -270,6 +279,20 @@ func (ctx *renderContext) TemplateFuncs() map[string]any {
 
 			return asYaml(files)
 		},
+		"ssh_host_key": func(type_ string) (s string, err error) {
+			pair, err := ctx.sshHostKeyPair(type_)
+			if err != nil {
+				return
+			}
+			return pair.Private, nil
+		},
+		"ssh_host_pubkey": func(type_ string) (s string, err error) {
+			pair, err := ctx.sshHostKeyPair(type_)
+			if err != nil {
+				return
+			}
+			return pair.Public, nil
+		},
 		"host_download_token": func() (token string, err error) {
 			key := ctx.Host.Name
 			token, found, err := hostDownloadTokens.Get(key)
@@ -337,3 +360,19 @@ func (ctx *renderContext) TemplateFuncs() map[string]any {
 
 	return funcs
 }
+
+func (ctx *renderContext) sshHostKeyPair(type_ string) (kp SSHKeyPair, err error) {
+	pairs, err := getSSHKeyPairs(ctx.Host.Name)
+	if err != nil {
+		return
+	}
+
+	for _, pair := range pairs {
+		if pair.Type == type_ {
+			return pair, nil
+		}
+	}
+
+	err = fmt.Errorf("no key pair with type %q", type_)
+	return
+}