233 lines
6.1 KiB
Go
233 lines
6.1 KiB
Go
package apiclient
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/http/httputil"
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"net/url"
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"sync"
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"time"
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"github.com/go-openapi/strfmt"
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log "github.com/sirupsen/logrus"
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"github.com/crowdsecurity/crowdsec/pkg/models"
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)
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type JWTTransport struct {
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MachineID *string
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Password *strfmt.Password
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Token string
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Expiration time.Time
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Scenarios []string
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URL *url.URL
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VersionPrefix string
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UserAgent string
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// Transport is the underlying HTTP transport to use when making requests.
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// It will default to http.DefaultTransport if nil.
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Transport http.RoundTripper
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UpdateScenario func() ([]string, error)
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refreshTokenMutex sync.Mutex
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}
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func (t *JWTTransport) refreshJwtToken() error {
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var err error
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if t.UpdateScenario != nil {
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t.Scenarios, err = t.UpdateScenario()
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if err != nil {
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return fmt.Errorf("can't update scenario list: %w", err)
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}
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log.Debugf("scenarios list updated for '%s'", *t.MachineID)
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}
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auth := models.WatcherAuthRequest{
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MachineID: t.MachineID,
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Password: t.Password,
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Scenarios: t.Scenarios,
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}
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/*
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we don't use the main client, so let's build the body
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*/
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var buf io.ReadWriter = &bytes.Buffer{}
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enc := json.NewEncoder(buf)
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enc.SetEscapeHTML(false)
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err = enc.Encode(auth)
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if err != nil {
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return fmt.Errorf("could not encode jwt auth body: %w", err)
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}
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req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s%s/watchers/login", t.URL, t.VersionPrefix), buf)
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if err != nil {
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return fmt.Errorf("could not create request: %w", err)
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}
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req.Header.Add("Content-Type", "application/json")
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client := &http.Client{
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Transport: &retryRoundTripper{
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next: http.DefaultTransport,
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maxAttempts: 5,
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withBackOff: true,
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retryStatusCodes: []int{http.StatusTooManyRequests, http.StatusServiceUnavailable, http.StatusGatewayTimeout, http.StatusInternalServerError},
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},
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}
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if t.UserAgent != "" {
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req.Header.Add("User-Agent", t.UserAgent)
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}
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if log.GetLevel() >= log.TraceLevel {
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dump, _ := httputil.DumpRequest(req, true)
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log.Tracef("auth-jwt request: %s", string(dump))
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}
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log.Debugf("auth-jwt(auth): %s %s", req.Method, req.URL.String())
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resp, err := client.Do(req)
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if err != nil {
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return fmt.Errorf("could not get jwt token: %w", err)
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}
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log.Debugf("auth-jwt : http %d", resp.StatusCode)
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if log.GetLevel() >= log.TraceLevel {
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dump, _ := httputil.DumpResponse(resp, true)
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log.Tracef("auth-jwt response: %s", string(dump))
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}
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defer resp.Body.Close()
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if resp.StatusCode < 200 || resp.StatusCode >= 300 {
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log.Debugf("received response status %q when fetching %v", resp.Status, req.URL)
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err = CheckResponse(resp)
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if err != nil {
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return err
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}
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}
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var response models.WatcherAuthResponse
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if err := json.NewDecoder(resp.Body).Decode(&response); err != nil {
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return fmt.Errorf("unable to decode response: %w", err)
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}
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if err := t.Expiration.UnmarshalText([]byte(response.Expire)); err != nil {
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return fmt.Errorf("unable to parse jwt expiration: %w", err)
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}
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t.Token = response.Token
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log.Debugf("token %s will expire on %s", t.Token, t.Expiration.String())
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return nil
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}
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func (t *JWTTransport) needsTokenRefresh() bool {
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return t.Token == "" || t.Expiration.Add(-time.Minute).Before(time.Now().UTC())
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}
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// prepareRequest returns a copy of the request with the necessary authentication headers.
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func (t *JWTTransport) prepareRequest(req *http.Request) (*http.Request, error) {
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// In a few occasions several goroutines will execute refreshJwtToken concurrently which is useless
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// and will cause overload on CAPI. We use a mutex to avoid this.
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t.refreshTokenMutex.Lock()
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defer t.refreshTokenMutex.Unlock()
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// We bypass the refresh if we are requesting the login endpoint, as it does not require a token,
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// and it leads to do 2 requests instead of one (refresh + actual login request).
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if req.URL.Path != "/"+t.VersionPrefix+"/watchers/login" && t.needsTokenRefresh() {
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if err := t.refreshJwtToken(); err != nil {
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return nil, err
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}
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}
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if t.UserAgent != "" {
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req.Header.Add("User-Agent", t.UserAgent)
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}
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req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", t.Token))
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return req, nil
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}
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// RoundTrip implements the RoundTripper interface.
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func (t *JWTTransport) RoundTrip(req *http.Request) (*http.Response, error) {
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req, err := t.prepareRequest(req)
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if err != nil {
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return nil, err
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}
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if log.GetLevel() >= log.TraceLevel {
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//requestToDump := cloneRequest(req)
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dump, _ := httputil.DumpRequest(req, true)
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log.Tracef("req-jwt: %s", string(dump))
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}
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// Make the HTTP request.
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resp, err := t.transport().RoundTrip(req)
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if log.GetLevel() >= log.TraceLevel {
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dump, _ := httputil.DumpResponse(resp, true)
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log.Tracef("resp-jwt: %s (err:%v)", string(dump), err)
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}
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if err != nil {
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// we had an error (network error for example, or 401 because token is refused), reset the token?
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t.ResetToken()
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return resp, fmt.Errorf("performing jwt auth: %w", err)
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}
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if resp != nil {
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log.Debugf("resp-jwt: %d", resp.StatusCode)
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}
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return resp, nil
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}
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func (t *JWTTransport) Client() *http.Client {
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return &http.Client{Transport: t}
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}
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func (t *JWTTransport) ResetToken() {
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log.Debug("resetting jwt token")
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t.refreshTokenMutex.Lock()
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t.Token = ""
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t.refreshTokenMutex.Unlock()
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}
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// transport() returns a round tripper that retries once when the status is unauthorized,
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// and 5 times when the infrastructure is overloaded.
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func (t *JWTTransport) transport() http.RoundTripper {
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transport := t.Transport
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if transport == nil {
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transport = http.DefaultTransport
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}
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return &retryRoundTripper{
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next: &retryRoundTripper{
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next: transport,
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maxAttempts: 5,
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withBackOff: true,
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retryStatusCodes: []int{http.StatusTooManyRequests, http.StatusServiceUnavailable, http.StatusGatewayTimeout},
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},
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maxAttempts: 2,
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withBackOff: false,
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retryStatusCodes: []int{http.StatusUnauthorized, http.StatusForbidden},
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onBeforeRequest: func(attempt int) {
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// reset the token only in the second attempt as this is when we know we had a 401 or 403
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// the second attempt is supposed to refresh the token
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if attempt > 0 {
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t.ResetToken()
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}
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},
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}
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}
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