Fix registering

client.go

@@ -301,7 +301,9 @@ func (cli *Client) MakeRequest(method string, httpURL string, reqBody interface{
 		req.Header.Set("Content-Type", "application/json")
 	}
 	req.Header.Set("User-Agent", cli.UserAgent)
-	req.Header.Set("Authorization", "Bearer "+cli.AccessToken)
+	if len(cli.AccessToken) > 0 {
+		req.Header.Set("Authorization", "Bearer "+cli.AccessToken)
+	}
 	cli.LogRequest(req, logBody)
 	res, err := cli.Client.Do(req)
 	if res != nil {
@@ -448,19 +450,15 @@ func (cli *Client) RegisterDummy(req *ReqRegister) (*RespRegister, error) {
 	res, uia, err := cli.Register(req)
 	if err != nil && uia == nil {
 		return nil, err
+	} else if uia == nil {
+		return nil, errors.New("server did not return user-interactive auth flows")
+	} else if !uia.HasSingleStageFlow(AuthTypeDummy) {
+		return nil, errors.New("server does not support m.login.dummy")
 	}
-	if uia != nil && uia.HasSingleStageFlow("m.login.dummy") {
-		req.Auth = struct {
-			Type    string `json:"type"`
-			Session string `json:"session,omitempty"`
-		}{"m.login.dummy", uia.Session}
-		res, _, err = cli.Register(req)
-		if err != nil {
-			return nil, err
-		}
-	}
-	if res == nil {
-		return nil, fmt.Errorf("registration failed: does this server support m.login.dummy? ")
+	req.Auth = BaseAuthData{Type: AuthTypeDummy, Session: uia.Session}
+	res, _, err = cli.Register(req)
+	if err != nil {
+		return nil, err
 	}
 	return res, nil
 }

requests.go

@@ -8,6 +8,27 @@ import (
 	"maunium.net/go/mautrix/pushrules"
 )
 
+type AuthType string
+
+const (
+	AuthTypePassword  = "m.login.password"
+	AuthTypeReCAPTCHA = "m.login.recaptcha"
+	AuthTypeOAuth2    = "m.login.oauth2"
+	AuthTypeSSO       = "m.login.sso"
+	AuthTypeEmail     = "m.login.email.identity"
+	AuthTypeMSISDN    = "m.login.msisdn"
+	AuthTypeToken     = "m.login.token"
+	AuthTypeDummy     = "m.login.dummy"
+)
+
+type IdentifierType string
+
+const (
+	IdentifierTypeUser       = "m.id.user"
+	IdentifierTypeThirdParty = "m.id.thirdparty"
+	IdentifierTypePhone      = "m.id.phone"
+)
+
 // ReqRegister is the JSON request for http://matrix.org/docs/spec/client_server/r0.2.0.html#post-matrix-client-r0-register
 type ReqRegister struct {
 	Username                 string      `json:"username,omitempty"`
@@ -18,8 +39,13 @@ type ReqRegister struct {
 	Auth                     interface{} `json:"auth,omitempty"`
 }
 
+type BaseAuthData struct {
+	Type    AuthType `json:"type"`
+	Session string   `json:"session"`
+}
+
 type UserIdentifier struct {
-	Type string `json:"type"`
+	Type IdentifierType `json:"type"`
 
 	User string `json:"user,omitempty"`
 
@@ -32,7 +58,7 @@ type UserIdentifier struct {
 
 // ReqLogin is the JSON request for http://matrix.org/docs/spec/client_server/r0.2.0.html#post-matrix-client-r0-login
 type ReqLogin struct {
-	Type                     string         `json:"type"`
+	Type                     AuthType       `json:"type"`
 	Identifier               UserIdentifier `json:"identifier"`
 	Password                 string         `json:"password,omitempty"`
 	Token                    string         `json:"token,omitempty"`

responses.go

@@ -91,17 +91,18 @@ type RespMediaUpload struct {
 // RespUserInteractive is the JSON response for https://matrix.org/docs/spec/client_server/r0.2.0.html#user-interactive-authentication-api
 type RespUserInteractive struct {
 	Flows []struct {
-		Stages []string `json:"stages"`
+		Stages []AuthType `json:"stages"`
 	} `json:"flows"`
-	Params    map[string]interface{} `json:"params"`
-	Session   string                 `json:"string"`
-	Completed []string               `json:"completed"`
-	ErrCode   string                 `json:"errcode"`
-	Error     string                 `json:"error"`
+	Params    map[AuthType]interface{} `json:"params"`
+	Session   string                   `json:"string"`
+	Completed []string                 `json:"completed"`
+
+	ErrCode string `json:"errcode"`
+	Error   string `json:"error"`
 }
 
 // HasSingleStageFlow returns true if there exists at least 1 Flow with a single stage of stageName.
-func (r RespUserInteractive) HasSingleStageFlow(stageName string) bool {
+func (r RespUserInteractive) HasSingleStageFlow(stageName AuthType) bool {
 	for _, f := range r.Flows {
 		if len(f.Stages) == 1 && f.Stages[0] == stageName {
 			return true