package tunnelstore import ( "bytes" "encoding/json" "fmt" "io" "net/http" "net/url" "path" "strings" "time" "github.com/google/uuid" "github.com/pkg/errors" "github.com/cloudflare/cloudflared/logger" ) const ( defaultTimeout = 15 * time.Second jsonContentType = "application/json" ) var ( ErrTunnelNameConflict = errors.New("tunnel with name already exists") ErrUnauthorized = errors.New("unauthorized") ErrBadRequest = errors.New("incorrect request parameters") ErrNotFound = errors.New("not found") ErrAPINoSuccess = errors.New("API call failed") ) type Tunnel struct { ID uuid.UUID `json:"id"` Name string `json:"name"` CreatedAt time.Time `json:"created_at"` DeletedAt time.Time `json:"deleted_at"` Connections []Connection `json:"connections"` } type Connection struct { ColoName string `json:"colo_name"` ID uuid.UUID `json:"id"` IsPendingReconnect bool `json:"is_pending_reconnect"` } type Change = string const ( ChangeNew = "new" ChangeUpdated = "updated" ChangeUnchanged = "unchanged" ) // Route represents a record type that can route to a tunnel type Route interface { json.Marshaler RecordType() string UnmarshalResult(body io.Reader) (RouteResult, error) } type RouteResult interface { // SuccessSummary explains what will route to this tunnel when it's provisioned successfully SuccessSummary() string } type DNSRoute struct { userHostname string } type DNSRouteResult struct { route *DNSRoute CName Change `json:"cname"` } func NewDNSRoute(userHostname string) Route { return &DNSRoute{ userHostname: userHostname, } } func (dr *DNSRoute) MarshalJSON() ([]byte, error) { s := struct { Type string `json:"type"` UserHostname string `json:"user_hostname"` }{ Type: dr.RecordType(), UserHostname: dr.userHostname, } return json.Marshal(&s) } func (dr *DNSRoute) UnmarshalResult(body io.Reader) (RouteResult, error) { var result DNSRouteResult err := parseResponse(body, &result) result.route = dr return &result, err } func (dr *DNSRoute) RecordType() string { return "dns" } func (res *DNSRouteResult) SuccessSummary() string { var msgFmt string switch res.CName { case ChangeNew: msgFmt = "Added CNAME %s which will route to this tunnel" case ChangeUpdated: // this is not currently returned by tunnelsore msgFmt = "%s updated to route to your tunnel" case ChangeUnchanged: msgFmt = "%s is already configured to route to your tunnel" } return fmt.Sprintf(msgFmt, res.route.userHostname) } type LBRoute struct { lbName string lbPool string } type LBRouteResult struct { route *LBRoute LoadBalancer Change `json:"load_balancer"` Pool Change `json:"pool"` } func NewLBRoute(lbName, lbPool string) Route { return &LBRoute{ lbName: lbName, lbPool: lbPool, } } func (lr *LBRoute) MarshalJSON() ([]byte, error) { s := struct { Type string `json:"type"` LBName string `json:"lb_name"` LBPool string `json:"lb_pool"` }{ Type: lr.RecordType(), LBName: lr.lbName, LBPool: lr.lbPool, } return json.Marshal(&s) } func (lr *LBRoute) RecordType() string { return "lb" } func (lr *LBRoute) UnmarshalResult(body io.Reader) (RouteResult, error) { var result LBRouteResult err := parseResponse(body, &result) result.route = lr return &result, err } func (res *LBRouteResult) SuccessSummary() string { var msg string switch res.LoadBalancer + "," + res.Pool { case "new,new": msg = "Created load balancer %s and added a new pool %s with this tunnel as an origin" case "new,updated": msg = "Created load balancer %s with an existing pool %s which was updated to use this tunnel as an origin" case "new,unchanged": msg = "Created load balancer %s with an existing pool %s which already has this tunnel as an origin" case "updated,new": msg = "Added new pool %[2]s with this tunnel as an origin to load balancer %[1]s" case "updated,updated": msg = "Updated pool %[2]s to use this tunnel as an origin and added it to load balancer %[1]s" case "updated,unchanged": msg = "Added pool %[2]s, which already has this tunnel as an origin, to load balancer %[1]s" case "unchanged,updated": msg = "Added this tunnel as an origin in pool %[2]s which is already used by load balancer %[1]s" case "unchanged,unchanged": msg = "Load balancer %s already uses pool %s which has this tunnel as an origin" case "unchanged,new": // this state is not possible fallthrough default: msg = "Something went wrong: failed to modify load balancer %s with pool %s; please check traffic manager configuration in the dashboard" } return fmt.Sprintf(msg, res.route.lbName, res.route.lbPool) } type Client interface { CreateTunnel(name string, tunnelSecret []byte) (*Tunnel, error) GetTunnel(tunnelID uuid.UUID) (*Tunnel, error) DeleteTunnel(tunnelID uuid.UUID) error ListTunnels(filter *Filter) ([]*Tunnel, error) CleanupConnections(tunnelID uuid.UUID) error RouteTunnel(tunnelID uuid.UUID, route Route) (RouteResult, error) } type RESTClient struct { baseEndpoints *baseEndpoints authToken string userAgent string client http.Client logger logger.Service } type baseEndpoints struct { accountLevel url.URL zoneLevel url.URL } var _ Client = (*RESTClient)(nil) func NewRESTClient(baseURL, accountTag, zoneTag, authToken, userAgent string, logger logger.Service) (*RESTClient, error) { if strings.HasSuffix(baseURL, "/") { baseURL = baseURL[:len(baseURL)-1] } accountLevelEndpoint, err := url.Parse(fmt.Sprintf("%s/accounts/%s/tunnels", baseURL, accountTag)) if err != nil { return nil, errors.Wrap(err, "failed to create account level endpoint") } zoneLevelEndpoint, err := url.Parse(fmt.Sprintf("%s/zones/%s/tunnels", baseURL, zoneTag)) if err != nil { return nil, errors.Wrap(err, "failed to create account level endpoint") } return &RESTClient{ baseEndpoints: &baseEndpoints{ accountLevel: *accountLevelEndpoint, zoneLevel: *zoneLevelEndpoint, }, authToken: authToken, userAgent: userAgent, client: http.Client{ Transport: &http.Transport{ TLSHandshakeTimeout: defaultTimeout, ResponseHeaderTimeout: defaultTimeout, }, Timeout: defaultTimeout, }, logger: logger, }, nil } type newTunnel struct { Name string `json:"name"` TunnelSecret []byte `json:"tunnel_secret"` } func (r *RESTClient) CreateTunnel(name string, tunnelSecret []byte) (*Tunnel, error) { if name == "" { return nil, errors.New("tunnel name required") } if _, err := uuid.Parse(name); err == nil { return nil, errors.New("you cannot use UUIDs as tunnel names") } body := &newTunnel{ Name: name, TunnelSecret: tunnelSecret, } resp, err := r.sendRequest("POST", r.baseEndpoints.accountLevel, body) if err != nil { return nil, errors.Wrap(err, "REST request failed") } defer resp.Body.Close() switch resp.StatusCode { case http.StatusOK: return unmarshalTunnel(resp.Body) case http.StatusConflict: return nil, ErrTunnelNameConflict } return nil, r.statusCodeToError("create tunnel", resp) } func (r *RESTClient) GetTunnel(tunnelID uuid.UUID) (*Tunnel, error) { endpoint := r.baseEndpoints.accountLevel endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v", tunnelID)) resp, err := r.sendRequest("GET", endpoint, nil) if err != nil { return nil, errors.Wrap(err, "REST request failed") } defer resp.Body.Close() if resp.StatusCode == http.StatusOK { return unmarshalTunnel(resp.Body) } return nil, r.statusCodeToError("get tunnel", resp) } func (r *RESTClient) DeleteTunnel(tunnelID uuid.UUID) error { endpoint := r.baseEndpoints.accountLevel endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v", tunnelID)) resp, err := r.sendRequest("DELETE", endpoint, nil) if err != nil { return errors.Wrap(err, "REST request failed") } defer resp.Body.Close() return r.statusCodeToError("delete tunnel", resp) } func (r *RESTClient) ListTunnels(filter *Filter) ([]*Tunnel, error) { endpoint := r.baseEndpoints.accountLevel endpoint.RawQuery = filter.encode() resp, err := r.sendRequest("GET", endpoint, nil) if err != nil { return nil, errors.Wrap(err, "REST request failed") } defer resp.Body.Close() if resp.StatusCode == http.StatusOK { return parseListTunnels(resp.Body) } return nil, r.statusCodeToError("list tunnels", resp) } func parseListTunnels(body io.ReadCloser) ([]*Tunnel, error) { var tunnels []*Tunnel err := parseResponse(body, &tunnels) return tunnels, err } func (r *RESTClient) CleanupConnections(tunnelID uuid.UUID) error { endpoint := r.baseEndpoints.accountLevel endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v/connections", tunnelID)) resp, err := r.sendRequest("DELETE", endpoint, nil) if err != nil { return errors.Wrap(err, "REST request failed") } defer resp.Body.Close() return r.statusCodeToError("cleanup connections", resp) } func (r *RESTClient) RouteTunnel(tunnelID uuid.UUID, route Route) (RouteResult, error) { endpoint := r.baseEndpoints.zoneLevel endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v/routes", tunnelID)) resp, err := r.sendRequest("PUT", endpoint, route) if err != nil { return nil, errors.Wrap(err, "REST request failed") } defer resp.Body.Close() if resp.StatusCode == http.StatusOK { return route.UnmarshalResult(resp.Body) } return nil, r.statusCodeToError("add route", resp) } func (r *RESTClient) sendRequest(method string, url url.URL, body interface{}) (*http.Response, error) { var bodyReader io.Reader if body != nil { if bodyBytes, err := json.Marshal(body); err != nil { return nil, errors.Wrap(err, "failed to serialize json body") } else { bodyReader = bytes.NewBuffer(bodyBytes) } } req, err := http.NewRequest(method, url.String(), bodyReader) if err != nil { return nil, errors.Wrapf(err, "can't create %s request", method) } req.Header.Set("User-Agent", r.userAgent) if bodyReader != nil { req.Header.Set("Content-Type", jsonContentType) } req.Header.Add("X-Auth-User-Service-Key", r.authToken) req.Header.Add("Accept", "application/json;version=1") return r.client.Do(req) } func parseResponse(reader io.Reader, data interface{}) error { // Schema for Tunnelstore responses in the v1 API. // Roughly, it's a wrapper around a particular result that adds failures/errors/etc var result struct { Result json.RawMessage `json:"result"` Success bool `json:"success"` Errors []string `json:"errors"` } // First, parse the wrapper and check the API call succeeded if err := json.NewDecoder(reader).Decode(&result); err != nil { return errors.Wrap(err, "failed to decode response") } if err := checkErrors(result.Errors); err != nil { return err } if !result.Success { return ErrAPINoSuccess } // At this point we know the API call succeeded, so, parse out the inner // result into the datatype provided as a parameter. return json.Unmarshal(result.Result, &data) } func unmarshalTunnel(reader io.Reader) (*Tunnel, error) { var tunnel Tunnel err := parseResponse(reader, &tunnel) return &tunnel, err } func checkErrors(errs []string) error { if len(errs) == 0 { return nil } if len(errs) == 1 { return fmt.Errorf("API error: %s", errs[0]) } allErrs := strings.Join(errs, "; ") return fmt.Errorf("API errors: %s", allErrs) } func (r *RESTClient) statusCodeToError(op string, resp *http.Response) error { if resp.Header.Get("Content-Type") == "application/json" { var errorsResp struct { Error string `json:"error"` } if json.NewDecoder(resp.Body).Decode(&errorsResp) == nil && errorsResp.Error != "" { return errors.Errorf("Failed to %s: %s", op, errorsResp.Error) } } switch resp.StatusCode { case http.StatusOK: return nil case http.StatusBadRequest: return ErrBadRequest case http.StatusUnauthorized, http.StatusForbidden: return ErrUnauthorized case http.StatusNotFound: return ErrNotFound } return errors.Errorf("API call to %s failed with status %d: %s", op, resp.StatusCode, http.StatusText(resp.StatusCode)) }