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package server
import (
"context"
"errors"
"os"
"time"
"github.com/eduvpn/eduvpn-common/internal/api"
"github.com/eduvpn/eduvpn-common/internal/api/profiles"
v2 "github.com/eduvpn/eduvpn-common/internal/config/v2"
"github.com/eduvpn/eduvpn-common/types/protocol"
srvtypes "github.com/eduvpn/eduvpn-common/types/server"
)
type Server struct {
identifier string
t srvtypes.Type
apiw *api.API
storage *v2.V2
}
var ErrInvalidProfile = errors.New("invalid profile")
func (s *Servers) NewServer(identifier string, t srvtypes.Type, api *api.API) Server {
return Server{
identifier: identifier,
t: t,
apiw: api,
storage: s.config,
}
}
// Profiles gets the profiles for the server
// It only does a /info network request if the profiles have not been cached
// force indicates whether or not the profiles should be fetched fresh
func (s *Server) Profiles(ctx context.Context) (*profiles.Info, error) {
a, err := s.api()
if err != nil {
return nil, err
}
// Otherwise get fresh profiles and set the cache
prfs, err := a.Info(ctx)
if err != nil {
return nil, err
}
err = s.SetProfileList(prfs.Public())
if err != nil {
return nil, err
}
return prfs, nil
}
func (s *Server) api() (*api.API, error) {
if s.apiw == nil {
return nil, errors.New("no API object found")
}
return s.apiw, nil
}
func (s *Server) findProfile(ctx context.Context, wgSupport bool) (*profiles.Profile, error) {
// Get the profiles by ignoring the cache
prfs, err := s.Profiles(ctx)
if err != nil {
return nil, err
}
// No profiles available
if prfs.Len() == 0 {
return nil, errors.New("the server has no available profiles for your account")
}
// No WireGuard support, we have to filter the profiles that only have WireGuard
if !wgSupport {
prfs = prfs.FilterWireGuard()
}
var chosenP profiles.Profile
n := prfs.Len()
switch n {
// If we now get no profiles then that means a profile with only WireGuard was removed
case 0:
return nil, errors.New("the server has only WireGuard profiles but the client does not support WireGuard")
case 1:
// Only one profile, make sure it is set
chosenP = prfs.MustIndex(0)
default:
// Profile doesn't exist
prID, err := s.ProfileID()
if err != nil {
return nil, err
}
v := prfs.Get(prID)
if v == nil {
return nil, ErrInvalidProfile
}
chosenP = *v
}
return &chosenP, nil
}
func (s *Server) connect(ctx context.Context, wgSupport bool, pTCP bool) (*srvtypes.Configuration, error) {
a, err := s.api()
if err != nil {
return nil, err
}
// find a suitable profile to connect
chosenP, err := s.findProfile(ctx, wgSupport)
if err != nil {
return nil, err
}
err = s.SetProfileID(chosenP.ID)
if err != nil {
return nil, err
}
protos := []protocol.Protocol{protocol.OpenVPN}
if wgSupport {
protos = append(protos, protocol.WireGuard)
}
// If the client supports WireGuard and the profile supports both protocols we remove openvpn from client support if EDUVPN_PREFER_WG is set to "1"
// This also only happens if prefer TCP is set to false
// TODO: remove the prefer TCP check when we have implemented proxyguard
if wgSupport && os.Getenv("EDUVPN_PREFER_WG") == "1" {
if chosenP.HasWireGuard() && chosenP.HasOpenVPN() {
protos = []protocol.Protocol{protocol.WireGuard}
}
}
// SAFETY: chosenP is guaranteed to be non-nil
apicfg, err := a.Connect(ctx, *chosenP, protos, pTCP)
if err != nil {
return nil, err
}
err = s.SetExpireTime(apicfg.Expires)
if err != nil {
return nil, err
}
var proxy *srvtypes.Proxy
if apicfg.Proxy != nil {
proxy = &srvtypes.Proxy{
SourcePort: apicfg.Proxy.SourcePort,
Listen: apicfg.Proxy.Listen,
Peer: apicfg.Proxy.Peer,
}
}
return &srvtypes.Configuration{
VPNConfig: apicfg.Configuration,
Protocol: apicfg.Protocol,
DefaultGateway: chosenP.DefaultGateway,
DNSSearchDomains: chosenP.DNSSearchDomains,
Proxy: proxy,
}, nil
}
func (s *Server) Disconnect(ctx context.Context) error {
a, err := s.api()
if err != nil {
return err
}
return a.Disconnect(ctx)
}
func (s *Server) cfgServer() (*v2.Server, error) {
if s.storage == nil {
return nil, errors.New("cannot get server, no configuration passed")
}
return s.storage.GetServer(s.identifier, s.t)
}
func (s *Server) SetProfileID(id string) error {
cs, err := s.cfgServer()
if err != nil {
return err
}
cs.Profiles.Current = id
return nil
}
func (s *Server) SetProfileList(prfs srvtypes.Profiles) error {
cs, err := s.cfgServer()
if err != nil {
return err
}
cs.Profiles.Map = prfs.Map
return nil
}
func (s *Server) SetExpireTime(et time.Time) error {
cs, err := s.cfgServer()
if err != nil {
return err
}
cs.ExpireTime = et
return nil
}
func (s *Server) ProfileID() (string, error) {
cs, err := s.cfgServer()
if err != nil {
return "", err
}
return cs.Profiles.Current, nil
}
func (s *Server) SetLocation(loc string) error {
if s.t != srvtypes.TypeSecureInternet {
return errors.New("changing secure internet location is only possible when the server is a secure location")
}
cs, err := s.cfgServer()
if err != nil {
return err
}
cs.CountryCode = loc
return nil
}
func (s *Server) SetCurrent() error {
if s.storage == nil {
return errors.New("no storage available")
}
s.storage.LastChosen = &v2.ServerType{
ID: s.identifier,
T: s.t,
}
return nil
}
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