Top-level setup package (#1605)

* Move config, setup, mscs into "setup" top-level folder

* oops, forgot the EDU server

* Add setup

* goimports

setup/config/config_signingkeyserver.go

@@ -0,0 +1,52 @@
+package config
+
+import "github.com/matrix-org/gomatrixserverlib"
+
+type SigningKeyServer struct {
+	Matrix *Global `yaml:"-"`
+
+	InternalAPI InternalAPIOptions `yaml:"internal_api"`
+
+	// The SigningKeyServer database caches the public keys of remote servers.
+	// It may be accessed by the FederationAPI, the ClientAPI, and the MediaAPI.
+	Database DatabaseOptions `yaml:"database"`
+
+	// Perspective keyservers, to use as a backup when direct key fetch
+	// requests don't succeed
+	KeyPerspectives KeyPerspectives `yaml:"key_perspectives"`
+
+	// Should we prefer direct key fetches over perspective ones?
+	PreferDirectFetch bool `yaml:"prefer_direct_fetch"`
+}
+
+func (c *SigningKeyServer) Defaults() {
+	c.InternalAPI.Listen = "http://localhost:7780"
+	c.InternalAPI.Connect = "http://localhost:7780"
+	c.Database.Defaults()
+	c.Database.ConnectionString = "file:signingkeyserver.db"
+}
+
+func (c *SigningKeyServer) Verify(configErrs *ConfigErrors, isMonolith bool) {
+	checkURL(configErrs, "signing_key_server.internal_api.listen", string(c.InternalAPI.Listen))
+	checkURL(configErrs, "signing_key_server.internal_api.bind", string(c.InternalAPI.Connect))
+	checkNotEmpty(configErrs, "signing_key_server.database.connection_string", string(c.Database.ConnectionString))
+}
+
+// KeyPerspectives are used to configure perspective key servers for
+// retrieving server keys.
+type KeyPerspectives []KeyPerspective
+
+type KeyPerspective struct {
+	// The server name of the perspective key server
+	ServerName gomatrixserverlib.ServerName `yaml:"server_name"`
+	// Server keys for the perspective user, used to verify the
+	// keys have been signed by the perspective server
+	Keys []KeyPerspectiveTrustKey `yaml:"keys"`
+}
+
+type KeyPerspectiveTrustKey struct {
+	// The key ID, e.g. ed25519:auto
+	KeyID gomatrixserverlib.KeyID `yaml:"key_id"`
+	// The public key in base64 unpadded format
+	PublicKey string `yaml:"public_key"`
+}