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auth.go
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auth.go
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package ghapi
import (
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"time"
"github.com/dgrijalva/jwt-go"
)
// generateJWT generates a new JSON Web Token out of the App's private pem
func generateJWT(appID string, pemFile string) (string, error) {
pemReader, err := os.Open(pemFile)
if err != nil {
return "", err
}
defer pemReader.Close()
pemBytes, err := ioutil.ReadAll(pemReader)
if err != nil {
return "", err
}
pemReader.Close()
block, _ := pem.Decode(pemBytes)
key, _ := x509.ParsePKCS1PrivateKey(block.Bytes)
claims := jwt.StandardClaims{
IssuedAt: time.Now().Unix(),
ExpiresAt: time.Now().Add(1 * time.Minute).Unix(), // using the maximum expiration time of 10 minutes
Issuer: appID,
}
token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
signedToken, err := token.SignedString(key)
if err != nil {
return "", err
}
return signedToken, nil
}
// getAppInstallationToken requests an app installation token from GitHub
func getAppInstallationToken(appToken, installationID string) (string, time.Time, error) {
ghURL, err := url.Parse(fmt.Sprintf("%s/app/installations/%s/access_tokens", GitHubAPIBaseURL, installationID))
if err != nil {
return "", time.Time{}, err
}
var req = &http.Request{
Method: http.MethodPost,
URL: ghURL,
Header: http.Header{
"Authorization": []string{fmt.Sprintf("Bearer %s", appToken)},
"Accept": []string{"application/vnd.github.v3+json"},
},
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return "", time.Time{}, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusCreated {
return "", time.Time{}, fmt.Errorf("ERROR: Failed to create GitHub App installation token (Response code '%d')", resp.StatusCode)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", time.Time{}, err
}
var response GHAPIResponseInstallationTokenSimplified
if err := json.Unmarshal(body, &response); err != nil {
return "", time.Time{}, err
}
return response.Token, response.ExpiresAt, nil
}