Initial QSfera import

Server/services/webfinger/pkg/relations/openid_discovery.go

@@ -0,0 +1,50 @@
+package relations
+
+import (
+	"context"
+
+	"github.com/qsfera/server/services/webfinger/pkg/config"
+	"github.com/qsfera/server/services/webfinger/pkg/service/v0"
+	"github.com/qsfera/server/services/webfinger/pkg/webfinger"
+)
+
+const (
+	OpenIDConnectRel   = "http://openid.net/specs/connect/1.0/issuer"
+	clientIDProp       = "http://qsfera.eu/ns/oidc/client_id"
+	scopesProp         = "http://qsfera.eu/ns/oidc/scopes"
+	legacyClientIDProp = "http://opencloud.eu/ns/oidc/client_id"
+	legacyScopesProp   = "http://opencloud.eu/ns/oidc/scopes"
+)
+
+type openIDDiscovery struct {
+	Href        string
+	OIDCClients map[string]config.OIDCClientConfig
+}
+
+// OpenIDDiscovery adds the Openid Connect issuer relation
+func OpenIDDiscovery(href string, clients map[string]config.OIDCClientConfig) service.RelationProvider {
+	return &openIDDiscovery{
+		Href:        href,
+		OIDCClients: clients,
+	}
+}
+
+func (l *openIDDiscovery) Add(_ context.Context, platform string, jrd *webfinger.JSONResourceDescriptor) {
+	if jrd == nil {
+		jrd = &webfinger.JSONResourceDescriptor{}
+	}
+	jrd.Links = append(jrd.Links, webfinger.Link{
+		Rel:  OpenIDConnectRel,
+		Href: l.Href,
+	})
+
+	if platform != "" {
+		if clientConfig, ok := l.OIDCClients[platform]; ok {
+			jrd.Properties = make(map[string]any)
+			jrd.Properties[clientIDProp] = clientConfig.ClientID
+			jrd.Properties[scopesProp] = clientConfig.Scopes
+			jrd.Properties[legacyClientIDProp] = clientConfig.ClientID
+			jrd.Properties[legacyScopesProp] = clientConfig.Scopes
+		}
+	}
+}