mirror of
https://github.com/abhinavxd/libredesk.git
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128 lines
2.8 KiB
Go
128 lines
2.8 KiB
Go
package utils
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import (
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"crypto/rand"
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"fmt"
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"net/textproto"
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"path/filepath"
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"regexp"
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"strings"
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"time"
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"golang.org/x/crypto/bcrypt"
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)
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var (
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reSpaces = regexp.MustCompile(`[\s]+`)
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)
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// RandomAlNumString generates a random alphanumeric string of length n.
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func RandomAlNumString(n int) (string, error) {
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const (
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dictionary = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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)
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var bytes = make([]byte, n)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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for k, v := range bytes {
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bytes[k] = dictionary[v%byte(len(dictionary))]
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}
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return string(bytes), nil
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}
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// GenerateRandomNumericString generates a random digit string of length n.
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func GenerateRandomNumericString(n int) (string, error) {
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const (
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dictionary = "0123456789"
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)
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var bytes = make([]byte, n)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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for k, v := range bytes {
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bytes[k] = dictionary[v%byte(len(dictionary))]
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}
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return string(bytes), nil
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}
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// GeneratePassword generates a secure password of specified length.
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func GeneratePassword(len int) ([]byte, error) {
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randomString, err := RandomAlNumString(len)
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if err != nil {
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return nil, err
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}
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hashedPassword, err := bcrypt.GenerateFromPassword([]byte(randomString), bcrypt.DefaultCost)
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if err != nil {
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return nil, err
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}
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return hashedPassword, nil
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}
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// InArray checks if an element of type T is present in a slice of type T.
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func InArray[T comparable](val T, vals []T) bool {
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for _, v := range vals {
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if v == val {
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return true
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}
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}
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return false
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}
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// MakeFilename makes a filename from the given string.
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func MakeFilename(fName string) string {
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name := strings.TrimSpace(fName)
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if name == "" {
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name, _ = RandomAlNumString(10)
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}
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// replace whitespace with "-"
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name = reSpaces.ReplaceAllString(name, "-")
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return filepath.Base(name)
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}
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// MakeAttachmentHeader
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func MakeAttachmentHeader(filename, encoding, contentType string) textproto.MIMEHeader {
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if encoding == "" {
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encoding = "base64"
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}
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if contentType == "" {
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contentType = "application/octet-stream"
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}
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h := textproto.MIMEHeader{}
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h.Set("Content-Disposition", "attachment; filename="+filename)
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h.Set("Content-Type", fmt.Sprintf("%s; name=\""+filename+"\"", contentType))
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h.Set("Content-Transfer-Encoding", encoding)
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return h
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}
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// SplitName splits a full name into first name and last name.
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func SplitName(fullName string) (firstName string, lastName string) {
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parts := strings.Fields(fullName)
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if len(parts) > 1 {
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lastName = parts[len(parts)-1]
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firstName = strings.Join(parts[:len(parts)-1], " ")
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} else if len(parts) == 1 {
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firstName = parts[0]
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}
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return firstName, lastName
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}
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// BackoffDelay introduces a delay between actions with backoff behavior.
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func BackoffDelay(try int, dur time.Duration) {
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if try > 0 {
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<-time.After(time.Duration(try) * time.Duration(dur))
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}
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}
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