91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
package rnd
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import (
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"crypto/rand"
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"fmt"
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"log"
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"math/big"
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)
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const (
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SessionIdLength = 64
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AuthTokenLength = 48
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AuthSecretLength = 23
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AuthSecretSeparator = '-'
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)
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// AuthToken returns a random hex encoded string that can be used for authentication.
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//
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// Examples: 9fa8e562564dac91b96881040e98f6719212a1a364e0bb25
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func AuthToken() string {
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b := make([]byte, 24)
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if _, err := rand.Read(b); err != nil {
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log.Fatal(err)
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}
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return fmt.Sprintf("%x", b)
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}
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// IsAuthToken checks if the string is a session id.
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func IsAuthToken(s string) bool {
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if l := len(s); l == AuthTokenLength {
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return IsHex(s)
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}
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return false
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}
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// AuthSecret returns a random, human-friendly token that can be used for authentication.
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// It is separated by 3 dashes for better readability and has a total length of 23 characters.
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//
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// Example: iXrDz-aY16n-4IUWM-otkM3
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func AuthSecret() string {
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m := big.NewInt(int64(len(CharsetBase62)))
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b := make([]byte, AuthSecretLength)
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for i := range b {
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if r, err := rand.Int(rand.Reader, m); err == nil {
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if (i+1)%6 == 0 {
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b[i] = AuthSecretSeparator
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} else {
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b[i] = CharsetBase62[r.Int64()]
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}
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}
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}
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return string(b)
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}
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// IsAuthSecret returns true if the string only contains alphanumeric ascii chars without whitespace.
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func IsAuthSecret(s string) bool {
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if len(s) != AuthSecretLength {
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return false
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}
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sep := 0
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for _, r := range s {
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if r == AuthSecretSeparator {
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sep++
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} else if (r < '0' || r > '9') && (r < 'A' || r > 'Z') && (r < 'a' || r > 'z') {
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return false
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}
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}
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return sep == AuthSecretLength/6
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}
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// SessionID returns the hashed session id string.
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func SessionID(token string) string {
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return Sha256([]byte(token))
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}
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// IsSessionID checks if the string is a session id string.
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func IsSessionID(id string) bool {
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if len(id) != SessionIdLength {
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return false
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}
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return IsHex(id)
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}
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