fix: normalize generic oauth bearer token type

oauth/generic.go

@@ -208,10 +208,7 @@ func (p *GenericOAuthProvider) GetUserInfo(ctx context.Context, token *OAuthToke
 	}
 
 	// Set authorization header
-	tokenType := token.TokenType
-	if tokenType == "" {
-		tokenType = "Bearer"
-	}
+	tokenType := normalizeAuthorizationTokenType(token.TokenType)
 	req.Header.Set("Authorization", fmt.Sprintf("%s %s", tokenType, token.AccessToken))
 	req.Header.Set("Accept", "application/json")
 
@@ -320,6 +317,14 @@ func (p *GenericOAuthProvider) GetProviderId() int {
 	return p.config.Id
 }
 
+func normalizeAuthorizationTokenType(tokenType string) string {
+	tokenType = strings.TrimSpace(tokenType)
+	if tokenType == "" || strings.EqualFold(tokenType, "Bearer") {
+		return "Bearer"
+	}
+	return tokenType
+}
+
 // IsGenericProvider returns true for generic providers
 func (p *GenericOAuthProvider) IsGenericProvider() bool {
 	return true