refactor: allow for empty AuthURL and TokenURL if IssueURL is provide…

…d, allow Mapper to be empty

since Kratos will use default Mapper if its value is empty
and will try to use OIDC discovery when IssuerURL is provided

pkg/idp/third_party.go

@@ -55,14 +55,14 @@ type Configuration struct {
 	// AuthURL is the authorize url, typically something like: https://example.org/oauth2/auth
 	// Should only be used when the OAuth2 / OpenID Connect server is not supporting OpenID Connect Discovery and when
 	// `provider` is set to `generic`.
-	// validate that this field is required only when Provider field == "generic"
-	AuthURL string `json:"auth_url" yaml:"auth_url" validate:"required_if=Provider generic"`
+	// validate that this field is required only when Provider field == "generic" and IssuerURL is empty
+	AuthURL string `json:"auth_url" yaml:"auth_url"`
 
 	// TokenURL is the token url, typically something like: https://example.org/oauth2/token
 	// Should only be used when the OAuth2 / OpenID Connect server is not supporting OpenID Connect Discovery and when
 	// `provider` is set to `generic`.
-	// validate that this field is required only when Provider field == "generic"
-	TokenURL string `json:"token_url" yaml:"token_url" validate:"required_if=Provider generic"`
+	// validate that this field is required only when Provider field == "generic" and IssuerURL is empty
+	TokenURL string `json:"token_url" yaml:"token_url"`
 
 	// Tenant is the Azure AD Tenant to use for authentication, and must be set when `provider` is set to `microsoft`.
 	// Can be either `common`, `organizations`, `consumers` for a multitenant application or a specific tenant like
@@ -103,7 +103,7 @@ type Configuration struct {
 	// profile information) to hydrate the identity's data.
 	//
 	// It can be either a URL (file://, http(s)://, base64://) or an inline JSONNet code snippet.
-	Mapper string `json:"mapper_url" yaml:"mapper_url" validate:"required"`
+	Mapper string `json:"mapper_url" yaml:"mapper_url"`
 
 	// RequestedClaims string encoded json object that specifies claims and optionally their properties which should be
 	// included in the id_token or returned from the UserInfo Endpoint.

pkg/idp/validation.go

@@ -23,9 +23,22 @@ type PayloadValidator struct {
 	logger logging.LoggerInterface
 }
 
+func genericIssuerOAuth2URLsValidation(sl validator.StructLevel) {
+	configuration := sl.Current().Interface().(Configuration)
+
+	if configuration.Provider == "generic" {
+		// Kratos will try OIDC discovery, so if IssuerURL is not empty, AuthURL and TokenURL could be empty
+		// if IssuerURL is empty, then we need both AuthURL and TokenURL
+		if configuration.IssuerURL == "" && (configuration.AuthURL == "" || configuration.TokenURL == "") {
+			sl.ReportError(configuration.IssuerURL, "issuer_url", "IssuerURL", "issuer_urls", "")
+		}
+	}
+}
+
 func (p *PayloadValidator) setupValidator() {
 	// validate Provider to be one of the supported ones
 	p.validator.RegisterAlias("supported_provider", fmt.Sprintf("oneof=%s", SUPPORTED_PROVIDERS))
+	p.validator.RegisterStructValidation(genericIssuerOAuth2URLsValidation, Configuration{})
 }
 
 func (p *PayloadValidator) NeedsValidation(r *http.Request) bool {