Maintenance: split each provider in a package

- Fix VyprVPN port
- Fix missing Auth overrides

internal/provider/privateinternetaccess/connection.go

@@ -0,0 +1,65 @@
+package privateinternetaccess
+
+import (
+	"github.com/qdm12/gluetun/internal/configuration"
+	"github.com/qdm12/gluetun/internal/constants"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/provider/utils"
+)
+
+func (p *PIA) GetOpenVPNConnection(selection configuration.ServerSelection) (
+	connection models.OpenVPNConnection, err error) {
+	protocol := constants.UDP
+	if selection.TCP {
+		protocol = constants.TCP
+	}
+
+	port, err := getPort(selection.TCP, selection.EncryptionPreset, selection.CustomPort)
+	if err != nil {
+		return connection, err
+	}
+
+	servers, err := p.filterServers(selection)
+	if err != nil {
+		return connection, err
+	}
+
+	var connections []models.OpenVPNConnection
+	for _, server := range servers {
+		for _, IP := range server.IPs {
+			connection := models.OpenVPNConnection{
+				IP:       IP,
+				Port:     port,
+				Protocol: protocol,
+			}
+			connections = append(connections, connection)
+		}
+	}
+
+	if selection.TargetIP != nil {
+		connection, err = utils.GetTargetIPConnection(connections, selection.TargetIP)
+	} else {
+		connection, err = utils.PickRandomConnection(connections, p.randSource), nil
+	}
+
+	if err != nil {
+		return connection, err
+	}
+
+	p.activeServer = findActiveServer(servers, connection)
+
+	return connection, nil
+}
+
+func findActiveServer(servers []models.PIAServer,
+	connection models.OpenVPNConnection) (activeServer models.PIAServer) {
+	// Reverse lookup server using the randomly picked connection
+	for _, server := range servers {
+		for _, ip := range server.IPs {
+			if connection.IP.Equal(ip) {
+				return server
+			}
+		}
+	}
+	return activeServer
+}