Fix #4877 to follow the OpenID Connect Audiences spec (#4878)

Signed-off-by: Gabriel Robertson <overminddl1@gmail.com>

Gopkg.lock

@@ -547,7 +547,7 @@
   revision = "e3534c89ef969912856dfa39e56b09e58c5f5daf"
 
 [[projects]]
-  digest = "1:fb22af9d8c1a6166ad299705648db460ba2c28a830f7f6cdd830019d7c3fd96f"
+  digest = "1:23f75ae90fcc38dac6fad6881006ea7d0f2c78db5f9f81f3df558dc91460e61f"
   name = "github.com/markbates/goth"
   packages = [
     ".",
@@ -562,8 +562,8 @@
     "providers/twitter",
   ]
   pruneopts = "NUT"
-  revision = "4933f155d89c3c52ab4ca545c6602cf4a1e87913"
-  version = "1.45.5"
+  revision = "f9c6649ab984d6ea71ef1e13b7b1cdffcf4592d3"
+  version = "v1.46.1"
 
 [[projects]]
   digest = "1:3ef954101983406a71171c4dc816a73e01bb3de608b3dd063627aa67a459f3e3"

vendor/github.com/markbates/goth/providers/openidConnect/openidConnect.go

@@ -200,8 +200,18 @@ func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
 func (p *Provider) validateClaims(claims map[string]interface{}) (time.Time, error) {
 	audience := getClaimValue(claims, []string{audienceClaim})
 	if audience != p.ClientKey {
+		found := false
+		audiences := getClaimValues(claims, []string{audienceClaim})
+		for _, aud := range audiences {
+			if aud == p.ClientKey {
+				found = true
+				break
+			}
+		}
+		if !found {
 			return time.Time{}, errors.New("audience in token does not match client key")
 		}
+	}
 
 	issuer := getClaimValue(claims, []string{issuerClaim})
 	if issuer != p.openIDConfig.Issuer {
@@ -355,6 +365,24 @@ func getClaimValue(data map[string]interface{}, claims []string) string {
 	return ""
 }
 
+func getClaimValues(data map[string]interface{}, claims []string) []string {
+	var result []string
+
+	for _, claim := range claims {
+		if value, ok := data[claim]; ok {
+			if stringValues, ok := value.([]interface{}); ok {
+				for _, stringValue := range stringValues {
+					if s, ok := stringValue.(string); ok && len(s) > 0 {
+						result = append(result, s)
+					}
+				}
+			}
+		}
+	}
+
+	return result
+}
+
 // decodeJWT decodes a JSON Web Token into a simple map
 // http://openid.net/specs/draft-jones-json-web-token-07.html
 func decodeJWT(jwt string) (map[string]interface{}, error) {