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