Refactor code structure for improved readability and maintainability

shell/matrix/profile.go

@@ -0,0 +1,55 @@
+package matrix
+
+import (
+	"context"
+	"fmt"
+	"mime"
+	"os"
+	"path/filepath"
+
+	"maunium.net/go/mautrix"
+)
+
+// SetAvatar uploads the image at filePath to the Matrix media repository
+// and sets it as the bot's avatar. Returns the mxc:// URI of the upload.
+func (c *Client) SetAvatar(ctx context.Context, filePath string) (string, error) {
+	f, err := os.Open(filePath)
+	if err != nil {
+		return "", fmt.Errorf("open %s: %w", filePath, err)
+	}
+	defer f.Close()
+
+	info, err := f.Stat()
+	if err != nil {
+		return "", fmt.Errorf("stat %s: %w", filePath, err)
+	}
+
+	mimeType := mime.TypeByExtension(filepath.Ext(filePath))
+	if mimeType == "" {
+		mimeType = "application/octet-stream"
+	}
+
+	resp, err := c.raw.UploadMedia(ctx, mautrix.ReqUploadMedia{
+		Content:       f,
+		ContentLength: info.Size(),
+		ContentType:   mimeType,
+		FileName:      filepath.Base(filePath),
+	})
+	if err != nil {
+		return "", fmt.Errorf("upload media: %w", err)
+	}
+
+	if err := c.raw.SetAvatarURL(ctx, resp.ContentURI); err != nil {
+		return "", fmt.Errorf("set avatar URL: %w", err)
+	}
+
+	return resp.ContentURI.String(), nil
+}
+
+// SetDisplayName sets the bot's display name on the Matrix homeserver.
+func (c *Client) SetDisplayName(ctx context.Context, name string) error {
+	if err := c.raw.SetDisplayName(ctx, name); err != nil {
+		return fmt.Errorf("set display name: %w", err)
+	}
+	return nil
+}