src/internal/config/config.go

@@ -30,6 +30,7 @@ import (
 
 type Config struct {
 	App           AppConfig           `mapstructure:"app"`
+	Screenshot    ScreenshotConfig    `mapstructure:"screenshot"`
 	Communication CommunicationConfig `mapstructure:"communication"`
 	Telemetry     TelemetryConfig     `mapstructure:"telemetry"`
 	Logging       LoggingConfig       `mapstructure:"logging"`
@@ -44,6 +45,13 @@ type AppConfig struct {
 	EnableCheckingUpdates   bool   `mapstructure:"enable_checking_updates"`
 }
 
+type ScreenshotConfig struct {
+	ScreenIndex int `mapstructure:"screen_index"`
+	Interval    int `mapstructure:"interval"`
+	Directory   string `mapstructure:"directory"`
+	BufferCount int `mapstructure:"buffer_count"`
+}
+
 type CommunicationConfig struct {
 	QrUrl                string `mapstructure:"self_approve_url"`
 	QrQueryToken         string `mapstructure:"qr_query_token"`
@@ -60,6 +68,10 @@ type LoggingConfig struct {
 	Output string `mapstructure:"output"`
 }
 
+func getTempDirectoryPath() string {
+	return os.TempDir()
+}
+
 func getDefaultConfig() Config {
 	return Config{
 		App: AppConfig{
@@ -70,6 +82,12 @@ func getDefaultConfig() Config {
 			Browser:                 "firefox",
 			EnableCheckingUpdates:   true,
 		},
+		Screenshot: ScreenshotConfig{
+			ScreenIndex: 0,
+			Interval: 5,
+			Directory: getTempDirectoryPath(),
+			BufferCount: 5,
+		},
 		Logging: LoggingConfig{
 			Level:  "info",
 			Output: "stdout",
@@ -117,6 +135,11 @@ func initializeViper(appName string) (*viper.Viper, string, error) {
 	v.SetDefault("app.browser", defaults.App.Browser)
 	v.SetDefault("app.enable_checking_updates", defaults.App.EnableCheckingUpdates)
 
+	v.SetDefault("screenshot.screen_index", defaults.Screenshot.ScreenIndex)
+	v.SetDefault("screenshot.interval", defaults.Screenshot.Interval)
+	v.SetDefault("screenshot.directory", defaults.Screenshot.Directory)
+	v.SetDefault("screenshot.buffer_count", defaults.Screenshot.BufferCount)
+
 	v.SetDefault("logging.level", defaults.Logging.Level)
 	v.SetDefault("logging.output", defaults.Logging.Output)
 
@@ -139,6 +162,11 @@ func (c *Config) Save() error {
 	v.Set("app.browser", c.App.Browser)
 	v.Set("app.enable_checking_updates", c.App.EnableCheckingUpdates)
 
+	v.Set("screenshot.screen_index", c.Screenshot.ScreenIndex)
+	v.Set("screenshot.interval", c.Screenshot.Interval)
+	v.Set("screenshot.directory", c.Screenshot.Directory)
+	v.Set("screenshot.buffer_count", c.Screenshot.BufferCount)
+
 	v.Set("logging.level", c.Logging.Level)
 	v.Set("logging.output", c.Logging.Output)
 

src/internal/screencapturer/interface.go

@@ -0,0 +1,26 @@
+// Copyright (c) 2025 Nikolai Papin
+//
+// This file is part of the Auto Attendance app that looks for
+// self-attend QR-codes during lectures and opens their URLs in your 
+// browser.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+// the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package screencapturer
+
+type ScreenCapturer interface {
+	Start() error
+	Stop() error
+	Screenshot() (filepath string)
+}