little update.

libmxclient/mxapi/discover.go

@@ -0,0 +1,32 @@
+package mxapi
+
+import (
+	"context"
+	"encoding/json"
+
+	"maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/id"
+)
+
+func Discover(mxid string) (string, error) {
+
+	localpart, hs, err := id.UserID(mxid).ParseAndValidateRelaxed()
+	if err != nil {
+		return "", err
+	}
+
+	wk, err := mautrix.DiscoverClientAPI(context.Background(), hs)
+	if err != nil {
+		return "", err
+	}
+	if wk != nil {
+		hs = wk.Homeserver.BaseURL
+	}
+
+	out, err := json.Marshal(map[string]string{"mxid": mxid, "homeserver": hs, "loginname": localpart})
+	if err != nil {
+		return "", err
+	}
+
+	return string(out), nil
+}

libmxclient/mxapi/login.go

@@ -0,0 +1,56 @@
+package mxapi
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/id"
+)
+
+type login_data struct {
+	Homeserver string `json:"homeserver"`
+	Mxid       string `json:"mxid"`
+	Loginname  string `json:"loginname"`
+	Password   string `json:"password"`
+}
+
+func Login(data string) (string, error) {
+	var ld login_data
+	err := json.Unmarshal([]byte(data), &ld)
+	if err != nil {
+		return "", err
+	}
+
+	mauclient, err := mautrix.NewClient(ld.Homeserver, id.UserID(ld.Mxid), "")
+	if err != nil {
+		return "", err
+	}
+
+	deviceName := fmt.Sprintf("smalbot-%d", time.Now().Unix())
+
+	resp, err := mauclient.Login(context.Background(), &mautrix.ReqLogin{
+		Type: "m.login.password",
+		Identifier: mautrix.UserIdentifier{
+			Type: "m.id.user",
+			User: ld.Loginname,
+		},
+		Password:                 ld.Password,
+		DeviceID:                 id.DeviceID(deviceName),
+		InitialDeviceDisplayName: deviceName,
+		StoreCredentials:         false,
+		StoreHomeserverURL:       false,
+		RefreshToken:             false,
+	})
+	if err != nil {
+		return "", err
+	}
+
+	tpl := "%s | %s | %s | %s\nrecovery | | | %x\nmaster | | | %x\n"
+	res := fmt.Sprintf(tpl, ld.Homeserver, ld.Loginname, id.UserID(ld.Mxid).Homeserver(), resp.AccessToken, sha256.Sum256([]byte(ld.Password)), sha256.Sum256([]byte(deviceName)))
+
+	return res, nil
+}