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package server
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
"path"
"time"
httpw "github.com/eduvpn/eduvpn-common/internal/http"
"github.com/go-errors/errors"
)
func APIGetEndpoints(baseURL string) (*Endpoints, error) {
u, err := url.Parse(baseURL)
if err != nil {
return nil, errors.WrapPrefix(err, "failed getting server endpoints", 0)
}
u.Path = path.Join(u.Path, "/.well-known/vpn-user-portal")
c := httpw.NewClient()
_, body, err := c.Get(u.String())
if err != nil {
return nil, errors.WrapPrefix(err, "failed getting server endpoints", 0)
}
ep := &Endpoints{}
if err = json.Unmarshal(body, ep); err != nil {
return nil, errors.WrapPrefix(err, "failed getting server endpoints", 0)
}
return ep, nil
}
func apiAuthorized(
srv Server,
method string,
endpoint string,
opts *httpw.OptionalParams,
) (http.Header, []byte, error) {
// Ensure optional is not nil as we will fill it with headers
if opts == nil {
opts = &httpw.OptionalParams{}
}
errorMessage := "failed API authorized"
b, err := srv.Base()
if err != nil {
return nil, nil, errors.WrapPrefix(err, errorMessage, 0)
}
// Join the paths
u, err := url.Parse(b.Endpoints.API.V3.API)
if err != nil {
return nil, nil, errors.WrapPrefix(err, errorMessage, 0)
}
u.Path = path.Join(u.Path, endpoint)
// Make sure the tokens are valid, this will return an error if re-login is needed
t, err := HeaderToken(srv)
if err != nil {
return nil, nil, errors.WrapPrefix(err, errorMessage, 0)
}
key := "Authorization"
val := fmt.Sprintf("Bearer %s", t)
if opts.Headers != nil {
opts.Headers.Add(key, val)
} else {
opts.Headers = http.Header{key: {val}}
}
// Create a client if it doesn't exist
if b.httpClient == nil {
b.httpClient = httpw.NewClient()
}
return b.httpClient.Do(method, u.String(), opts)
}
func apiAuthorizedRetry(
srv Server,
method string,
endpoint string,
opts *httpw.OptionalParams,
) (http.Header, []byte, error) {
h, body, err := apiAuthorized(srv, method, endpoint, opts)
if err == nil {
return h, body, nil
}
statErr := &httpw.StatusError{}
// Only retry authorized if we get an HTTP 401
if errors.As(err, &statErr) && statErr.Status == 401 {
// Mark the token as expired and retry, so we trigger the refresh flow
MarkTokenExpired(srv)
h, body, err = apiAuthorized(srv, method, endpoint, opts)
}
return h, body, err
}
func APIInfo(srv Server) error {
_, body, err := apiAuthorizedRetry(srv, http.MethodGet, "/info", nil)
if err != nil {
return err
}
profiles := ProfileInfo{}
if err = json.Unmarshal(body, &profiles); err != nil {
return errors.WrapPrefix(err, "failed API /info", 0)
}
b, err := srv.Base()
if err != nil {
return err
}
// Store the profiles and make sure that the current profile is not overwritten
prev := b.Profiles.Current
b.Profiles = profiles
b.Profiles.Current = prev
return nil
}
// see https://github.com/eduvpn/documentation/blob/v3/API.md#request-1
func boolToYesNo(preferTCP bool) string {
if preferTCP {
return "yes"
}
return "no"
}
func APIConnectWireguard(
srv Server,
profileID string,
pubkey string,
preferTCP bool,
openVPNSupport bool,
) (string, string, time.Time, error) {
hdrs := http.Header{
"content-type": {"application/x-www-form-urlencoded"},
"accept": {"application/x-wireguard-profile"},
}
// This profile also supports OpenVPN
// Indicate that we also accept OpenVPN profiles
if openVPNSupport {
hdrs.Add("accept", "application/x-openvpn-profile")
}
vals := url.Values{
"profile_id": {profileID},
"public_key": {pubkey},
"prefer_tcp": {boolToYesNo(preferTCP)},
}
h, body, err := apiAuthorizedRetry(srv, http.MethodPost, "/connect",
&httpw.OptionalParams{Headers: hdrs, Body: vals})
if err != nil {
return "", "", time.Time{}, err
}
exp := h.Get("expires")
expTime, err := http.ParseTime(exp)
if err != nil {
return "", "", time.Time{}, errors.WrapPrefix(err, "failed obtaining a WireGuard configuration", 0)
}
contentH := h.Get("content-type")
content := "openvpn"
if contentH == "application/x-wireguard-profile" {
content = "wireguard"
}
return string(body), content, expTime, nil
}
func APIConnectOpenVPN(srv Server, profileID string, preferTCP bool) (string, time.Time, error) {
hdrs := http.Header{
"content-type": {"application/x-www-form-urlencoded"},
"accept": {"application/x-openvpn-profile"},
}
vals := url.Values{
"profile_id": {profileID},
"prefer_tcp": {boolToYesNo(preferTCP)},
}
h, body, err := apiAuthorizedRetry(srv, http.MethodPost, "/connect",
&httpw.OptionalParams{Headers: hdrs, Body: vals})
if err != nil {
return "", time.Time{}, err
}
expH := h.Get("expires")
expT, err := http.ParseTime(expH)
if err != nil {
return "", time.Time{}, errors.WrapPrefix(err, "failed obtaining an OpenVPN configuration", 0)
}
return string(body), expT, nil
}
// APIDisconnect disconnects from the API.
func APIDisconnect(server Server) error {
// The timeout is a bit lower here such that this does not take a too long time for disconnecting
// Clients may wish to retry this
_, _, err := apiAuthorized(server, http.MethodPost, "/disconnect", &httpw.OptionalParams{Timeout: 5 * time.Second})
return err
}
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