mirror of
https://github.com/davidallendj/opaal.git
synced 2025-12-19 19:17:01 -07:00
102 lines
2.5 KiB
Go
102 lines
2.5 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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"os"
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"os/exec"
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"runtime"
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"strings"
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"github.com/golang-jwt/jwt"
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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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func DecodeJwt(encoded string) ([][]byte, error) {
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// split the string into 3 segments and decode
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segments := strings.Split(encoded, ".")
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decoded := [][]byte{}
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for _, segment := range segments {
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bytes, _ := jwt.DecodeSegment(segment)
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decoded = append(decoded, bytes)
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}
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return decoded, nil
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}
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func PathExists(path string) (bool, error) {
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_, err := os.Stat(path)
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if err == nil {
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return true, nil
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}
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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// https://stackoverflow.com/questions/39320371/how-start-web-server-to-open-page-in-browser-in-golang
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// open opens the specified URL in the default browser of the user.
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func OpenUrl(url string) error {
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var cmd string
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var args []string
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switch runtime.GOOS {
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case "windows":
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cmd = "cmd"
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args = []string{"/c", "start"}
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case "darwin":
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cmd = "open"
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default: // "linux", "freebsd", "openbsd", "netbsd"
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cmd = "xdg-open"
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}
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args = append(args, url)
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return exec.Command(cmd, args...).Start()
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}
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func GetCommit() string {
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bytes, err := exec.Command("git", "rev --parse HEAD").Output()
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if err != nil {
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return ""
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}
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return string(bytes)
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}
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