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validate.go
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validate.go
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package sso
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"github.com/golang-jwt/jwt/v5"
"github.com/lestrrat-go/jwx/v2/jwk"
)
const cacheTimeoutJWKSet = 6 * 3600
// Validate JWT token and return claims
func validateToken(tokenString string) (jwt.MapClaims, error) {
// parse token and validate signature
token, err := jwt.Parse(tokenString, getKey)
if err != nil {
return nil, err
}
// validate issuer claim
claims := token.Claims.(jwt.MapClaims)
iss := claims["iss"].(string)
if iss != ssoIssuer1 && iss != ssoIssuer2 {
return nil, fmt.Errorf("invalid issuer claim")
}
// validate audience claim
aud := claims["aud"].([]any)
if aud[0].(string) != ssoClientId {
return nil, fmt.Errorf("invalid first audience claim")
}
if aud[1].(string) != "EVE Online" {
return nil, fmt.Errorf("invalid 2nd audience claim")
}
return claims, nil
}
// getKey returns the public key for a JWT token.
func getKey(token *jwt.Token) (any, error) {
set, err := fetchJWKSet()
if err != nil {
return nil, err
}
keyID, ok := token.Header["kid"].(string)
if !ok {
return nil, errors.New("expecting JWT header to have string kid")
}
key, ok := set.LookupKeyID(keyID)
if !ok {
return nil, fmt.Errorf("unable to find key %q", keyID)
}
var rawKey any
if err := key.Raw(&rawKey); err != nil {
return nil, fmt.Errorf("failed to create public key: %s", err)
}
return rawKey, nil
}
// fetchJWKSet returns the current JWK set from the web. It is cached.
func fetchJWKSet() (jwk.Set, error) {
key := "jwk-set"
v, found := cache.Get(key)
if found {
return v.(jwk.Set), nil
}
jwksURL, err := determineJwksURL()
if err != nil {
return nil, err
}
set, err := jwk.Fetch(context.Background(), jwksURL)
if err != nil {
return nil, err
}
cache.Set(key, set, cacheTimeoutJWKSet)
return set, nil
}
// Determine URL for JWK sets dynamically from web site and return it
func determineJwksURL() (string, error) {
resp, err := http.Get(oauthURL)
if err != nil {
return "", err
}
if resp.Body != nil {
defer resp.Body.Close()
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
var data map[string]any
if err := json.Unmarshal(body, &data); err != nil {
return "", err
}
jwksURL := data["jwks_uri"].(string)
return jwksURL, nil
}