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passthrough.go
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passthrough.go
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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strings"
log "github.com/Sirupsen/logrus"
"github.com/labstack/echo"
"github.com/labstack/echo/engine"
"github.com/labstack/echo/engine/standard"
"github.com/SUSE/stratos-ui/repository/interfaces"
)
// API Host Prefix to replace if the custom header is supplied
const apiPrefix = "api."
func getEchoURL(c echo.Context) url.URL {
log.Debug("getEchoURL")
u := c.Request().URL().(*standard.URL).URL
// dereference so we get a copy
return *u
}
func getEchoHeaders(c echo.Context) http.Header {
log.Debug("getEchoHeaders")
h := make(http.Header)
originalHeader := c.Request().Header().(*standard.Header).Header
for k, v := range originalHeader {
if k == "Cookie" {
continue
}
vCopy := make([]string, len(v))
copy(vCopy, v)
h[k] = vCopy
}
return h
}
func makeRequestURI(c echo.Context) *url.URL {
log.Debug("makeRequestURI")
uri := getEchoURL(c)
prefix := strings.TrimSuffix(c.Path(), "*")
uri.Path = strings.TrimPrefix(uri.Path, prefix)
return &uri
}
func getPortalUserGUID(c echo.Context) (string, error) {
log.Debug("getPortalUserGUID")
portalUserGUIDIntf := c.Get("user_id")
if portalUserGUIDIntf == nil {
return "", errors.New("Corrupted session")
}
return portalUserGUIDIntf.(string), nil
}
func getRequestParts(c echo.Context) (engine.Request, []byte, error) {
log.Debug("getRequestParts")
var body []byte
var err error
req := c.Request()
if bodyReader := req.Body(); bodyReader != nil {
if body, err = ioutil.ReadAll(bodyReader); err != nil {
return nil, nil, errors.New("Failed to read request body")
}
}
return req, body, nil
}
func buildJSONResponse(cnsiList []string, responses map[string]*interfaces.CNSIRequest) map[string]*json.RawMessage {
log.Debug("buildJSONResponse")
jsonResponse := make(map[string]*json.RawMessage)
for _, guid := range cnsiList {
var response []byte
cnsiResponse, ok := responses[guid]
switch {
case !ok:
response = []byte(`{"error": {"statusCode": 500, "status": "Request timed out"}}`)
case cnsiResponse.Error != nil:
response = []byte(fmt.Sprintf(`{"error": {"statusCode": 500, "status": %q}}`, cnsiResponse.Error.Error()))
case cnsiResponse.Response != nil:
response = cnsiResponse.Response
}
// Check the HTTP Status code to make sure that it is actually a valid response
if cnsiResponse.StatusCode >= 400 {
errorJson, err := json.Marshal(cnsiResponse)
if err != nil {
errorJson = []byte(fmt.Sprintf(`{"statusCode": 500, "status": "Failed to proxy request"}`))
}
response = []byte(fmt.Sprintf(`{"error": "%s", "errorResponse": %q}`, errorJson, string(cnsiResponse.Response)))
}
if len(response) > 0 {
jsonResponse[guid] = (*json.RawMessage)(&response)
} else {
jsonResponse[guid] = nil
}
}
return jsonResponse
}
func (p *portalProxy) buildCNSIRequest(cnsiGUID string, userGUID string, method string, uri *url.URL, body []byte, header http.Header) (interfaces.CNSIRequest, error) {
log.Debug("buildCNSIRequest")
cnsiRequest := interfaces.CNSIRequest{
GUID: cnsiGUID,
UserGUID: userGUID,
Method: method,
Body: body,
Header: header,
}
cnsiRec, err := p.GetCNSIRecord(cnsiGUID)
if err != nil {
return cnsiRequest, err
}
cnsiRequest.URL = new(url.URL)
*cnsiRequest.URL = *cnsiRec.APIEndpoint
cnsiRequest.URL.Path = uri.Path
cnsiRequest.URL.RawQuery = uri.RawQuery
return cnsiRequest, nil
}
func (p *portalProxy) validateCNSIList(cnsiList []string) error {
log.Debug("validateCNSIList")
for _, cnsiGUID := range cnsiList {
if _, err := p.GetCNSIRecord(cnsiGUID); err != nil {
return err
}
}
return nil
}
func fwdCNSIStandardHeaders(cnsiRequest *interfaces.CNSIRequest, req *http.Request) {
log.Debug("fwdCNSIStandardHeaders")
for k, v := range cnsiRequest.Header {
switch {
// Skip these
// - "Referer" causes CF to fail with a 403
// - "Connection", "X-Cap-*" and "Cookie" are consumed by us
// - "Accept-Encoding" must be excluded otherwise the transport will expect us to handle the encoding/compression
case k == "Connection", k == "Cookie", k == "Referer", k == "Accept-Encoding", strings.HasPrefix(strings.ToLower(k), "x-cap-"):
// Forwarding everything else
default:
req.Header[k] = v
}
}
}
func (p *portalProxy) proxy(c echo.Context) error {
log.Debug("proxy")
responses, err := p.ProxyRequest(c, makeRequestURI(c))
if err != nil {
return err
}
return p.SendProxiedResponse(c, responses)
}
func (p *portalProxy) ProxyRequest(c echo.Context, uri *url.URL) (map[string]*interfaces.CNSIRequest, error) {
log.Debug("proxy")
cnsiList := strings.Split(c.Request().Header().Get("x-cap-cnsi-list"), ",")
shouldPassthrough := "true" == c.Request().Header().Get("x-cap-passthrough")
if err := p.validateCNSIList(cnsiList); err != nil {
return nil, echo.NewHTTPError(http.StatusBadRequest, err.Error())
}
header := getEchoHeaders(c)
header.Del("Cookie")
portalUserGUID, err := getPortalUserGUID(c)
if err != nil {
return nil, echo.NewHTTPError(http.StatusInternalServerError, err.Error())
}
req, body, err := getRequestParts(c)
if err != nil {
return nil, echo.NewHTTPError(http.StatusInternalServerError, err.Error())
}
if shouldPassthrough {
if len(cnsiList) > 1 {
err := errors.New("Requested passthrough to multiple CNSIs. Only single CNSI passthroughs are supported.")
return nil, echo.NewHTTPError(http.StatusBadRequest, err.Error())
}
}
// send the request to each CNSI
done := make(chan *interfaces.CNSIRequest)
for _, cnsi := range cnsiList {
cnsiRequest, buildErr := p.buildCNSIRequest(cnsi, portalUserGUID, req.Method(), uri, body, header)
if buildErr != nil {
return nil, echo.NewHTTPError(http.StatusBadRequest, buildErr.Error())
}
// Allow the host part of the API URL to be overridden
apiHost := c.Request().Header().Get("x-cap-api-host")
// Don't allow any '.' chars in the api name
if apiHost != "" && !strings.ContainsAny(apiHost, ".") {
// Add trailing . for when we replace
apiHost = apiHost + "."
// Override the API URL if needed
if strings.HasPrefix(cnsiRequest.URL.Host, apiPrefix) {
// Replace 'api.' prefix with supplied prefix
cnsiRequest.URL.Host = strings.Replace(cnsiRequest.URL.Host, apiPrefix, apiHost, 1)
} else {
// Add supplied prefix to the domain
cnsiRequest.URL.Host = apiHost + cnsiRequest.URL.Host
}
}
go p.doRequest(&cnsiRequest, done)
}
responses := make(map[string]*interfaces.CNSIRequest)
for range cnsiList {
res := <-done
responses[res.GUID] = res
}
return responses, nil
}
func (p *portalProxy) DoProxyRequest(requests []interfaces.ProxyRequestInfo) (map[string]*interfaces.CNSIRequest, error) {
log.Debug("DoProxyRequest")
// send the request to each endpoint
done := make(chan *interfaces.CNSIRequest)
for _, requestInfo := range requests {
cnsiRequest, buildErr := p.buildCNSIRequest(requestInfo.EndpointGUID, requestInfo.UserGUID, requestInfo.Method, requestInfo.URI, requestInfo.Body, requestInfo.Headers)
cnsiRequest.ResponseGUID = requestInfo.ResultGUID
if buildErr != nil {
return nil, echo.NewHTTPError(http.StatusBadRequest, buildErr.Error())
}
go p.doRequest(&cnsiRequest, done)
}
responses := make(map[string]*interfaces.CNSIRequest)
for range requests {
res := <-done
responses[res.ResponseGUID] = res
}
return responses, nil
}
func (p *portalProxy) SendProxiedResponse(c echo.Context, responses map[string]*interfaces.CNSIRequest) error {
shouldPassthrough := "true" == c.Request().Header().Get("x-cap-passthrough")
var cnsiList []string
for k := range responses {
cnsiList = append(cnsiList, k)
}
if shouldPassthrough {
cnsiGUID := cnsiList[0]
res, ok := responses[cnsiGUID]
if !ok {
return echo.NewHTTPError(http.StatusRequestTimeout, "Request timed out")
}
// in passthrough mode, set the status code to that of the single response
c.Response().WriteHeader(res.StatusCode)
// we don't care if this fails
_, _ = c.Response().Write(res.Response)
return nil
}
jsonResponse := buildJSONResponse(cnsiList, responses)
e := json.NewEncoder(c.Response())
err := e.Encode(jsonResponse)
if err != nil {
log.Errorf("Failed to encode JSON: %v\n%#v\n", err, jsonResponse)
}
return err
}
func (p *portalProxy) doRequest(cnsiRequest *interfaces.CNSIRequest, done chan<- *interfaces.CNSIRequest) {
log.Debug("doRequest")
var body io.Reader
var res *http.Response
var req *http.Request
var err error
if len(cnsiRequest.Body) > 0 {
body = bytes.NewReader(cnsiRequest.Body)
}
req, err = http.NewRequest(cnsiRequest.Method, cnsiRequest.URL.String(), body)
if err != nil {
cnsiRequest.Error = err
if done != nil {
done <- cnsiRequest
}
return
}
// get a cnsi token record and a cnsi record
tokenRec, _, err := p.getCNSIRequestRecords(cnsiRequest)
if err != nil {
cnsiRequest.Error = err
if done != nil {
done <- cnsiRequest
}
return
}
// Copy original headers through, except custom portal-proxy Headers
fwdCNSIStandardHeaders(cnsiRequest, req)
// Mkae the request using the appropriate auth helper
switch tokenRec.AuthType {
case interfaces.AuthTypeHttpBasic:
res, err = p.doHttpBasicFlowRequest(cnsiRequest, req)
case interfaces.AuthTypeOIDC:
res, err = p.doOidcFlowRequest(cnsiRequest, req)
default:
res, err = p.doOauthFlowRequest(cnsiRequest, req)
}
if err != nil {
cnsiRequest.StatusCode = 500
cnsiRequest.Response = []byte(err.Error())
cnsiRequest.Error = err
} else if res.Body != nil {
cnsiRequest.StatusCode = res.StatusCode
cnsiRequest.Status = res.Status
cnsiRequest.Response, cnsiRequest.Error = ioutil.ReadAll(res.Body)
defer res.Body.Close()
}
if done != nil {
done <- cnsiRequest
}
}