diff --git a/src/matrix/.client.go.swp b/src/matrix/.client.go.swp
new file mode 100644
index 0000000..2c04bfa
Binary files /dev/null and b/src/matrix/.client.go.swp differ
diff --git a/src/matrix/client.go b/src/matrix/client.go
index 60e38d0..3b72da2 100644
--- a/src/matrix/client.go
+++ b/src/matrix/client.go
@@ -1,7 +1,147 @@
 package matrix
 
+import (
+	"context"
+	"strings"
+	"sync"
+
+	"maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/crypto"
+	"maunium.net/go/mautrix/crypto/cryptohelper"
+)
+
 type Client struct {
-   client *mautrix.Client
+	client          *mautrix.Client
+	accessToken     string
+	deviceId        string
+	pickleKeyString string
 }
 
-func New // https://chrastecky.dev/post/11
+func NewClient(ctx context.Context, uid, password, recoveryKey string) (*Client, error) {
+	ctx, can := context.WithCancel(ctx)
+	defer can()
+
+	// uid like @username:homeserver.com
+	username := strings.Split(uid, ":")[0]
+	homeserver := strings.Split(uid, ":")[1]
+
+	c, err := mautrix.NewClient(homeserver, uid, "")
+	if err != nil {
+		return nil, err
+	}
+	syncer := mautrix.NewDefaultSyncer()
+	c.Syncer = syncer
+	cryptoHelper, err := setupCryptoHelper(ctx, client)
+	if err != nil {
+		panic(err)
+	}
+	c.Crypto = cryptoHelper
+
+	readyChan := make(chan bool)
+	var once sync.Once
+	syncer.OnSync(func(ctx context.Context, resp *mautrix.RespSync, since string) bool {
+		once.Do(func() {
+			close(readyChan)
+		})
+		return true
+	})
+	go func() {
+		if err := c.Sync(); err != nil {
+			can()
+			panic(err)
+		}
+	}()
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	case <-readyChan:
+	}
+
+	if err := verifyWithRecoveryKey(ctx, cryptoHelper.Machine()); err != nil {
+		return nil, err
+	}
+
+	client := &Client{
+		client: c,
+	}
+
+	return client, client.login(ctx, username, password)
+}
+
+func (c *Client) login(ctx context.Context, username, password string) error {
+	if c.accessToken != "" {
+		return nil
+	}
+
+	resp, err := c.client.Login(ctx, &mautrix.ReqLogin{
+		Type: mautrix.AuthTypePassword,
+		Identifier: mautrix.UserIdentifier{
+			User: username,
+			Type: mautrix.IdentifierTypeUser,
+		},
+		Password:         password,
+		StoreCredentials: true,
+	})
+	if err != nil {
+		return err
+	}
+
+	c.deviceId = resp.DeviceID
+	c.accessToken = resp.AccessToken
+	return nil
+}
+
+/*
+	content := event.MessageEventContent{
+		MsgType: event.MsgText,
+		Body:    "Hello world from Go!",
+	}
+
+	_, err = client.SendMessageEvent(context.Background(), roomID, event.EventMessage, content)
+	if err != nil {
+		panic(err)
+	}
+*/
+
+func setupCryptoHelper(ctx context.Context, cli *mautrix.Client) (*cryptohelper.CryptoHelper, error) {
+	// remember to use a secure key for the pickle key in production
+	pickleKey := []byte(pickleKeyString)
+
+	// this is a path to the SQLite database you will use to store various data about your bot
+	dbPath := "crypto.db"
+
+	helper, err := cryptohelper.NewCryptoHelper(cli, pickleKey, dbPath)
+	if err != nil {
+		return nil, err
+	}
+
+	// initialize the database and other stuff
+	err = helper.Init(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return helper, nil
+}
+
+func verifyWithRecoveryKey(ctx context.Context, machine *crypto.OlmMachine) (err error) {
+	keyId, keyData, err := machine.SSSS.GetDefaultKeyData(ctx)
+	if err != nil {
+		return
+	}
+	key, err := keyData.VerifyRecoveryKey(keyId, recoveryKey)
+	if err != nil {
+		return
+	}
+	err = machine.FetchCrossSigningKeysFromSSSS(ctx, key)
+	if err != nil {
+		return
+	}
+	err = machine.SignOwnDevice(ctx, machine.OwnIdentity())
+	if err != nil {
+		return
+	}
+	err = machine.SignOwnMasterKey(ctx)
+
+	return
+}