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template.go
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template.go
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package main
import (
"crypto/sha1"
"errors"
"fmt"
"html/template"
"io"
"io/ioutil"
"os"
"path"
"strings"
"github.com/Masterminds/sprig"
"go.uber.org/zap"
)
// Template holds information about processing
type Template struct {
Source string `toml:"src"`
Target string `toml:"dst"`
Context map[string]string `toml:"data, omitempty"`
}
func secret(name string) string {
src := path.Join("/etc/secrets", name)
if _, err := os.Stat(src); os.IsNotExist(err) {
log.Fatal("unable to locate", zap.String("secret", src), zap.Error(err))
}
data, err := ioutil.ReadFile(src)
if err != nil {
log.Fatal("unable to read", zap.String("secret", src), zap.Error(err))
}
return string(data)
}
func sha(value string) string {
h := sha1.New()
if _, err := io.WriteString(h, value); err != nil {
log.Fatal("Hashing failed", zap.Error(err))
}
return fmt.Sprintf("%x", h.Sum(nil))
}
func pathExists(path string) bool {
if _, err := os.Stat(path); !os.IsNotExist(err) {
return true
}
return false
}
func pathInclude(path string) string {
if data, err := os.ReadFile(path); err == nil {
return string(data)
}
return ""
}
// Enabled returns true if templates are enabled
func (t *Template) Enabled() bool {
return t.Source != "" && t.Target != ""
}
// Process creates out file from src template
func (t *Template) Process() error {
if t.Source != "" {
if _, err := os.Stat(t.Source); os.IsNotExist(err) {
log.Fatal("unable to open", zap.String("src", t.Source), zap.Error(err))
}
} else {
return nil
}
data, err := ioutil.ReadFile(t.Source)
if err != nil {
return err
}
tmpl, err := template.New(t.Source).Funcs(template.FuncMap{
"replace": strings.Replace,
"lower": strings.ToLower,
"upper": strings.ToUpper,
"pathExists": pathExists,
"include": pathInclude,
"env": os.Getenv,
"k8s": secret,
"sha1": sha,
}).Funcs(sprig.FuncMap()).Parse(string(data))
if err != nil {
return err
}
if t.Target != "" {
dest, err := os.Create(t.Target)
if err != nil {
log.Fatal("unable to create", zap.String("dest", t.Target), zap.Error(err))
}
defer dest.Close()
if err := tmpl.Execute(dest, &t.Context); err != nil {
log.Fatal("template error", zap.Error(err))
}
} else {
return errors.New("`dst` is empty")
}
return nil
}