initial commit: certmanager

migrate from python to golang

internal/pki/pki.go

@@ -0,0 +1,60 @@
+package pki
+
+import (
+	"fmt"
+	"strings"
+
+	"git.unkin.net/unkin/certmanager/internal/vault"
+)
+
+// CertificateResponse is the JSON-serialisable output returned to callers.
+type CertificateResponse struct {
+	Certificate    string `json:"certificate"`
+	PrivateKey     string `json:"private_key"`
+	FullChain      string `json:"full_chain"`
+	CACertificate  string `json:"ca_certificate"`
+}
+
+type issueRequest struct {
+	CommonName string `json:"common_name"`
+	AltNames   string `json:"alt_names,omitempty"`
+	IPSans     string `json:"ip_sans,omitempty"`
+	TTL        string `json:"ttl"`
+}
+
+type issueResponse struct {
+	Data struct {
+		Certificate string `json:"certificate"`
+		PrivateKey  string `json:"private_key"`
+		IssuingCA   string `json:"issuing_ca"`
+	} `json:"data"`
+}
+
+// IssueCert requests a PKI certificate from Vault.
+func IssueCert(client *vault.Client, mountPoint, roleName, commonName string, altNames, ipSans []string, expiryDays int) (*CertificateResponse, error) {
+	req := issueRequest{
+		CommonName: commonName,
+		TTL:        fmt.Sprintf("%dd", expiryDays),
+	}
+	if len(altNames) > 0 {
+		req.AltNames = strings.Join(altNames, ",")
+	}
+	if len(ipSans) > 0 {
+		req.IPSans = strings.Join(ipSans, ",")
+	}
+
+	var resp issueResponse
+	path := fmt.Sprintf("%s/issue/%s", mountPoint, roleName)
+	if err := client.Post(path, req, &resp); err != nil {
+		return nil, err
+	}
+
+	fullChain := resp.Data.IssuingCA + "\n" + resp.Data.Certificate
+
+	return &CertificateResponse{
+		Certificate:   resp.Data.Certificate,
+		PrivateKey:    resp.Data.PrivateKey,
+		FullChain:     fullChain,
+		CACertificate: resp.Data.IssuingCA,
+	}, nil
+}