Purevpn support (#208)

Fixes #192

internal/settings/openvpn.go

@@ -66,6 +66,8 @@ func GetOpenVPNSettings(paramsReader params.Reader, vpnProvider models.VPNProvid
 		settings.Provider, err = GetVyprvpnSettings(paramsReader)
 	case constants.Nordvpn:
 		settings.Provider, err = GetNordvpnSettings(paramsReader)
+	case constants.Purevpn:
+		settings.Provider, err = GetPurevpnSettings(paramsReader)
 	default:
 		err = fmt.Errorf("VPN service provider %q is not valid", vpnProvider)
 	}

internal/settings/providers.go

@@ -175,3 +175,29 @@ func GetNordvpnSettings(paramsReader params.Reader) (settings models.ProviderSet
 	}
 	return settings, nil
 }
+
+// GetPurevpnSettings obtains Purevpn settings from environment variables using the params package.
+func GetPurevpnSettings(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.Region, err = paramsReader.GetPurevpnRegion()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.Country, err = paramsReader.GetPurevpnCountry()
+	if err != nil {
+		return settings, err
+	}
+	settings.ServerSelection.City, err = paramsReader.GetPurevpnCity()
+	if err != nil {
+		return settings, err
+	}
+	return settings, nil
+}