agola/cmd/toolbox/cmd/template.go

129 lines
2.9 KiB
Go

// Copyright 2019 Sorint.lab
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"crypto/md5"
"crypto/sha256"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"runtime"
"strconv"
"text/template"
"time"
"github.com/spf13/cobra"
)
var cmdTemplate = &cobra.Command{
Use: "template",
Run: templateRun,
Short: "executes the provided template from stdin and returns the output in stdout",
}
func init() {
CmdToolbox.AddCommand(cmdTemplate)
}
func md5sum(filename string) (string, error) {
if filename == "" {
return "", errors.New("empty filename")
}
if info, err := os.Stat(filename); err == nil {
if info.Size() > 1024*1024 {
return "", fmt.Errorf("file %q is too big", filename)
}
} else {
return "", err
}
f, err := os.Open(filename)
if err != nil {
return "", err
}
h := md5.New()
if _, err := io.Copy(h, f); err != nil {
return "", err
}
return fmt.Sprintf("%x", h.Sum(nil)), nil
}
func sha256sum(filename string) (string, error) {
if filename == "" {
return "", errors.New("empty filename")
}
if info, err := os.Stat(filename); err == nil {
if info.Size() > 1024*1024 {
return "", fmt.Errorf("file %q is too big", filename)
}
} else {
return "", err
}
f, err := os.Open(filename)
if err != nil {
return "", err
}
h := sha256.New()
if _, err := io.Copy(h, f); err != nil {
return "", err
}
return fmt.Sprintf("%x", h.Sum(nil)), nil
}
type tmplData struct {
Environment map[string]string
}
func templateRun(cmd *cobra.Command, args []string) {
funcMap := map[string]interface{}{
"md5sum": md5sum,
"sha256sum": sha256sum,
"env": func(s string) string { return os.Getenv(s) },
"os": func() string { return runtime.GOOS },
"arch": func() string { return runtime.GOARCH },
"unixtime": func() string { return strconv.FormatInt(time.Now().UnixNano(), 10) },
"year": func() string { return time.Now().Format("2006") },
"month": func() string { return time.Now().Format("01") },
"day": func() string { return time.Now().Format("02") },
}
tmplStr, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Fatalf("failed to read template: %v", err)
}
tmpl, err := template.New("base").Funcs(funcMap).Parse(string(tmplStr))
if err != nil {
log.Fatalf("failed to parse template: %v", err)
}
data := &tmplData{}
if err := tmpl.Execute(os.Stdout, data); err != nil {
log.Fatalf("failed to execute template: %v", err)
}
}