restructure the API and update the admin script

api/util/util.go

@@ -0,0 +1,67 @@
+package util
+
+import (
+	"bytes"
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"text/template"
+	"time"
+)
+
+func Render(file string, data interface{}) ([]byte, error) {
+	var (
+		rendered *bytes.Buffer
+		tmpl     *template.Template
+		content  []byte
+		err      error
+	)
+
+	if content, err = os.ReadFile(file); err != nil {
+		return nil, err
+	}
+
+	if tmpl, err = template.New("template").Parse(string(content)); err != nil {
+		return nil, err
+	}
+
+	rendered = bytes.NewBuffer(nil)
+	err = tmpl.Execute(rendered, data)
+
+	return rendered.Bytes(), err
+}
+
+func GetDuration(d string) (time.Duration, error) {
+	var (
+		d_num uint64
+		err   error
+	)
+
+	d_num_end := d[len(d)-1]
+	d_num_str := strings.TrimSuffix(d, string(d_num_end))
+
+	if d_num, err = strconv.ParseUint(d_num_str, 10, 64); err != nil {
+		return 0, err
+	}
+
+	switch d_num_end {
+	case 's':
+		return time.Duration(d_num) * (time.Second), nil
+
+	case 'm':
+		return time.Duration(d_num) * (time.Second * 60), nil
+
+	case 'h':
+		return time.Duration(d_num) * ((time.Second * 60) * 60), nil
+	}
+
+	return 0, fmt.Errorf("invalid time duration format")
+}
+
+func GetSHA1(s string) string {
+	hasher := sha1.New()
+	return hex.EncodeToString(hasher.Sum([]byte(s)))
+}