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104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
package util
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import (
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"crypto/pbkdf2"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"io"
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"mime/quotedprintable"
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"strings"
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)
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const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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// GetRandomString generates a random alphanumeric string of the specified length,
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// optionally using only specified characters
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func GetRandomString(n int, alphabets ...byte) (string, error) {
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chars := alphanum
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if len(alphabets) > 0 {
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chars = string(alphabets)
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}
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cnt := len(chars)
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max := 255 / cnt * cnt
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bytes := make([]byte, n)
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randread := n * 5 / 4
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randbytes := make([]byte, randread)
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for i := 0; i < n; {
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if _, err := rand.Read(randbytes); err != nil {
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return "", err
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}
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for j := 0; i < n && j < randread; j++ {
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b := int(randbytes[j])
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if b >= max {
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continue
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}
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bytes[i] = chars[b%cnt]
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i++
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}
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}
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return string(bytes), nil
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}
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// EncodePassword encodes a password using PBKDF2.
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func EncodePassword(password string, salt string) (string, error) {
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newPasswd, err := pbkdf2.Key(sha256.New, password, []byte(salt), 10000, 50)
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if err != nil {
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return "", err
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}
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return hex.EncodeToString(newPasswd), nil
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}
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// GetBasicAuthHeader returns a base64 encoded string from user and password.
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func GetBasicAuthHeader(user string, password string) string {
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var userAndPass = user + ":" + password
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return "Basic " + base64.StdEncoding.EncodeToString([]byte(userAndPass))
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}
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// DecodeBasicAuthHeader decodes user and password from a basic auth header.
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func DecodeBasicAuthHeader(header string) (string, string, error) {
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var code string
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parts := strings.SplitN(header, " ", 2)
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if len(parts) == 2 && parts[0] == "Basic" {
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code = parts[1]
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}
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decoded, err := base64.StdEncoding.DecodeString(code)
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if err != nil {
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return "", "", err
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}
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userAndPass := strings.SplitN(string(decoded), ":", 2)
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if len(userAndPass) != 2 {
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return "", "", errors.New("invalid basic auth header")
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}
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return userAndPass[0], userAndPass[1], nil
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}
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// RandomHex returns a hex encoding of n random bytes.
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func RandomHex(n int) (string, error) {
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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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return hex.EncodeToString(bytes), nil
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}
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// decodeQuotedPrintable decodes quoted-printable UTF-8 string
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func DecodeQuotedPrintable(encodedValue string) string {
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decodedBytes, err := io.ReadAll(quotedprintable.NewReader(strings.NewReader(encodedValue)))
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if err != nil {
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return encodedValue
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}
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return string(decodedBytes)
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}
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