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github.go
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github.go
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package cmd
import (
"crypto/x509"
"encoding/pem"
"fmt"
"github.com/go-resty/resty/v2"
"github.com/golang-jwt/jwt/v4"
"strings"
"time"
)
var client = resty.New()
var privateKeyPrefix = "-----BEGIN RSA PRIVATE KEY-----"
var privateKeySuffix = "-----END RSA PRIVATE KEY-----"
type GitHubError struct {
Message string `json:"message"`
}
type GitHubInstallationToken struct {
Token string `json:"token"`
}
func CreateToken(id string, privateKey string) (string, error) {
if !strings.HasPrefix(privateKey, privateKeyPrefix) {
return "", fmt.Errorf("private-key should have prefix %s", privateKeyPrefix)
}
if !strings.HasSuffix(strings.TrimSuffix(privateKey, "\n"), privateKeySuffix) {
return "", fmt.Errorf("private-key should have suffix %s", privateKeySuffix)
}
dec, _ := pem.Decode([]byte(privateKey))
rsa, err := x509.ParsePKCS1PrivateKey(dec.Bytes)
if err != nil {
return "", err
}
token := jwt.NewWithClaims(jwt.SigningMethodRS256, jwt.MapClaims{
"iss": id,
"iat": time.Now().Add(-60 * time.Second).Unix(),
"exp": time.Now().Add(10 * 60 * time.Second).Unix(),
})
return token.SignedString(rsa)
}
func CreateInstallationToken(installId string, token string) (string, error) {
gitHubInstallationToken := &GitHubInstallationToken{}
gitHubError := &GitHubError{}
res, err := client.R().
EnableTrace().
SetHeader("Accept", "application/vnd.github+json").
SetHeader("Authorization", fmt.Sprintf("Bearer %s", token)).
SetResult(&gitHubInstallationToken).
SetError(&gitHubError).
SetPathParams(map[string]string{
"installId": installId,
}).
Post("https://api.github.com/app/installations/{installId}/access_tokens")
if err != nil {
return "", err
}
if res.IsError() {
return "", fmt.Errorf("GitHub API error: %s - %s", res.Status(), gitHubError.Message)
}
return gitHubInstallationToken.Token, nil
}