118 lines
2.7 KiB
Go
118 lines
2.7 KiB
Go
package rnd
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import (
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"crypto/rand"
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"fmt"
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"hash/crc32"
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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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AppPasswordLength = 27
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AppPasswordSeparator = '-'
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)
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// AuthToken generates a random hexadecimal character token for authenticating client applications.
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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 might be a valid auth token.
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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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// AppPassword generates a random, human-friendly authentication token that can also be used as
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// password replacement for client applications. It is separated by 3 dashes for better readability
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// and has a total length of 27 characters.
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//
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// Example: OXiV72-wTtiL9-d04jO7-X7XP4p
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func AppPassword() string {
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m := big.NewInt(int64(len(CharsetBase62)))
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b := make([]byte, 0, AppPasswordLength)
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for i := 0; i < AppPasswordLength; i++ {
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if (i+1)%7 == 0 {
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b = append(b, AppPasswordSeparator)
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} else if i == AppPasswordLength-1 {
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b = append(b, CharsetBase62[crc32.ChecksumIEEE(b)%62])
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return string(b)
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} else if r, err := rand.Int(rand.Reader, m); err == nil {
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b = append(b, CharsetBase62[r.Int64()])
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}
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}
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return string(b)
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}
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// IsAppPassword checks if the string might be a valid app password.
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func IsAppPassword(s string, verifyChecksum bool) bool {
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// Verify token length.
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if len(s) != AppPasswordLength {
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return false
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}
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// Check characters.
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sep := 0
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for _, r := range s {
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if r == AppPasswordSeparator {
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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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// Check number of separators.
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if sep != AppPasswordLength/7 {
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return false
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} else if !verifyChecksum {
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return true
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}
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// Verify token checksum.
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return s[AppPasswordLength-1] == CharsetBase62[crc32.ChecksumIEEE([]byte(s[:AppPasswordLength-1]))%62]
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}
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// IsAuthAny checks if the string might be a valid auth token or app password.
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func IsAuthAny(s string) bool {
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// Check if string might be a regular auth token.
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if IsAuthToken(s) {
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return true
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}
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// Check if string might be a human-friendly app password.
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if IsAppPassword(s, false) {
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return true
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}
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return false
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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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