Refactor (#174)

- Goal was to simplify main.go complexity
- Use common structures and interfaces for all vpn providers
- Moved files around
- Removed some alias models

internal/settings/providers.go

@@ -0,0 +1,137 @@
+package settings
+
+import (
+	"github.com/qdm12/private-internet-access-docker/internal/constants"
+	"github.com/qdm12/private-internet-access-docker/internal/models"
+	"github.com/qdm12/private-internet-access-docker/internal/params"
+)
+
+// GetPIASettings obtains PIA settings from environment variables using the params package.
+func GetPIASettings(paramsReader params.Reader) (settings models.ProviderSettings, err error) {
+	settings.Name = constants.PrivateInternetAccess
+	settings.ServerSelection.Protocol, err = paramsReader.GetNetworkProtocol()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.TargetIP, err = paramsReader.GetTargetIP()
+	if err != nil {
+		return settings, err
+	}
+	encryptionPreset, err := paramsReader.GetPIAEncryptionPreset()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.EncryptionPreset = encryptionPreset
+	settings.ExtraConfigOptions.EncryptionPreset = encryptionPreset
+	settings.ServerSelection.Region, err = paramsReader.GetPIARegion()
+	if err != nil {
+		return settings, err
+	}
+	settings.PortForwarding.Enabled, err = paramsReader.GetPortForwarding()
+	if err != nil {
+		return settings, err
+	}
+	if settings.PortForwarding.Enabled {
+		settings.PortForwarding.Filepath, err = paramsReader.GetPortForwardingStatusFilepath()
+		if err != nil {
+			return settings, err
+		}
+	}
+	return settings, nil
+}
+
+// GetMullvadSettings obtains Mullvad settings from environment variables using the params package.
+func GetMullvadSettings(paramsReader params.Reader) (settings models.ProviderSettings, err error) {
+	settings.Name = constants.Mullvad
+	settings.ServerSelection.Protocol, err = paramsReader.GetNetworkProtocol()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.TargetIP, err = paramsReader.GetTargetIP()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.Country, err = paramsReader.GetMullvadCountry()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.City, err = paramsReader.GetMullvadCity()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.ISP, err = paramsReader.GetMullvadISP()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.CustomPort, err = paramsReader.GetMullvadPort()
+	if err != nil {
+		return settings, err
+	}
+	return settings, nil
+}
+
+// GetWindscribeSettings obtains Windscribe settings from environment variables using the params package.
+func GetWindscribeSettings(paramsReader params.Reader) (settings models.ProviderSettings, err error) {
+	settings.Name = constants.Windscribe
+	settings.ServerSelection.Protocol, err = paramsReader.GetNetworkProtocol()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.TargetIP, err = paramsReader.GetTargetIP()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.Region, err = paramsReader.GetWindscribeRegion()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.CustomPort, err = paramsReader.GetWindscribePort(settings.ServerSelection.Protocol)
+	if err != nil {
+		return settings, err
+	}
+	return settings, nil
+}
+
+// GetSurfsharkSettings obtains Surfshark settings from environment variables using the params package.
+func GetSurfsharkSettings(paramsReader params.Reader) (settings models.ProviderSettings, err error) {
+	settings.Name = constants.Surfshark
+	settings.ServerSelection.Protocol, err = paramsReader.GetNetworkProtocol()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.TargetIP, err = paramsReader.GetTargetIP()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.Region, err = paramsReader.GetSurfsharkRegion()
+	if err != nil {
+		return settings, err
+	}
+	return settings, nil
+}
+
+// GetCyberghostSettings obtains Cyberghost settings from environment variables using the params package.
+func GetCyberghostSettings(paramsReader params.Reader) (settings models.ProviderSettings, err error) {
+	settings.Name = constants.Cyberghost
+	settings.ServerSelection.Protocol, err = paramsReader.GetNetworkProtocol()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.TargetIP, err = paramsReader.GetTargetIP()
+	if err != nil {
+		return settings, err
+	}
+	settings.ExtraConfigOptions.ClientKey, err = paramsReader.GetCyberghostClientKey()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.Group, err = paramsReader.GetCyberghostGroup()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.Region, err = paramsReader.GetCyberghostRegion()
+	if err != nil {
+		return settings, err
+	}
+	return settings, nil
+}