mirror of
https://github.com/davidallendj/opaal.git
synced 2025-12-20 03:27:02 -07:00
48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
package util
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import (
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"encoding/base64"
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"math/rand"
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"net/url"
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"strings"
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)
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func RandomString(n int) string {
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const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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const (
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letterIdxBits = 6 // 6 bits to represent a letter index
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letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
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letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
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)
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b := make([]byte, n)
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// A rand.Int63() generates 63 random bits, enough for letterIdxMax letters!
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for i, cache, remain := n-1, rand.Int63(), letterIdxMax; i >= 0; {
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if remain == 0 {
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cache, remain = rand.Int63(), letterIdxMax
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}
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if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
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b[i] = letterBytes[idx]
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i--
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}
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cache >>= letterIdxBits
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remain--
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}
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return string(b)
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}
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func BuildAuthorizationUrl(authEndpoint string, clientId string, redirectUri []string, state string, responseType string, scope []string) string {
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return authEndpoint + "?" + "client_id=" + clientId +
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"&redirect_uri=" + EncodeURL(strings.Join(redirectUri, ",")) +
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"&response_type=" + responseType +
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"&state=" + state +
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"&scope=" + strings.Join(scope, "+")
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}
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func EncodeURL(s string) string {
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return url.QueryEscape(s)
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}
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func EncodeBase64(s string) string {
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return base64.StdEncoding.EncodeToString([]byte(s))
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}
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