105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
package utils
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import (
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"crypto/rand"
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"encoding/hex"
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"log"
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mathrand "math/rand"
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"strconv"
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"strings"
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)
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// GenerateUrl generate random string for plak url
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func GenerateUrl(length uint8) string {
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listChars := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
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b := make([]rune, length)
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for i := range b {
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b[i] = listChars[mathrand.Intn(len(listChars))]
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}
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return string(b)
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}
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// GenerateSecret generate random secret (32 bytes hexadecimal)
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func GenerateSecret() string {
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key := make([]byte, 32)
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_, err := rand.Read(key)
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if err != nil {
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log.Printf("Failed to generate secret")
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}
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return hex.EncodeToString(key)
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}
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// CheckCharRedundant verify is a character is redundant in a string
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func CheckCharRedundant(source string, char string) bool { // Verify if a char is redundant
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if strings.Count(source, char) > 1 {
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return true
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}
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return false
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}
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func parseIntBeforeSeparator(source *string, sep string) (int, error) { // return 0 & error if error, only accept positive number
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if CheckCharRedundant(*source, sep) {
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return 0, &ParseIntBeforeSeparatorError{Message: *source + ": cannot parse value as int"}
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}
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var value int
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var err error
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if strings.Contains(*source, sep) {
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value, err = strconv.Atoi(strings.Split(*source, sep)[0])
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if err != nil {
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log.Println(err)
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return 0, &ParseIntBeforeSeparatorError{Message: *source + ": cannot parse value as int"}
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}
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if value < 0 { // Only positive value is correct
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return 0, &ParseIntBeforeSeparatorError{Message: *source + ": format only take positive value"}
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}
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if value > 99 {
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return 0, &ParseIntBeforeSeparatorError{Message: *source + ": Format only take two number"}
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}
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*source = strings.Join(strings.Split(*source, sep)[1:], "")
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}
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return value, nil
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}
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// ParseExpiration Parse "1d1h1m1s" duration format. Return 0 & error if error
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func ParseExpiration(source string) (int, error) {
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var expiration int
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var tempOutput int
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var err error
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if source == "0" {
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return 0, nil
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}
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source = strings.ToLower(source)
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tempOutput, err = parseIntBeforeSeparator(&source, "d")
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expiration = tempOutput * 86400
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if err != nil {
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log.Println(err)
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return 0, &ParseExpirationError{Message: "Invalid syntax"}
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}
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tempOutput, err = parseIntBeforeSeparator(&source, "h")
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expiration += tempOutput * 3600
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if err != nil {
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log.Println(err)
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return 0, &ParseExpirationError{Message: "Invalid syntax"}
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}
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tempOutput, err = parseIntBeforeSeparator(&source, "m")
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expiration += tempOutput * 60
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if err != nil {
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log.Println(err)
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return 0, &ParseExpirationError{Message: "Invalid syntax"}
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}
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tempOutput, err = parseIntBeforeSeparator(&source, "s")
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expiration += tempOutput * 1
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if err != nil {
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log.Println(err)
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return 0, &ParseExpirationError{Message: "Invalid syntax"}
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}
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return expiration, nil
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}
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