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|
package gitlab
import (
"context"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/golang-jwt/jwt/v5"
"github.com/hashicorp/go-retryablehttp"
"gitlab.com/gitlab-org/cluster-integration/gitlab-agent/v16/internal/tool/httpz"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
)
const (
// This header carries the JWT token for gitlab-rails
jwtRequestHeader = "Gitlab-Kas-Api-Request"
jwtValidFor = 30 * time.Second
jwtNotBefore = 5 * time.Second
jwtIssuer = "gitlab-kas"
jwtGitLabAudience = "gitlab"
)
type HTTPClient interface {
Do(*retryablehttp.Request) (*http.Response, error)
}
type Client struct {
Backend *url.URL
HTTPClient HTTPClient
HTTPClientNoRetry HTTPClient
AuthSecret []byte
UserAgent string
}
func NewClient(backend *url.URL, authSecret []byte, opts ...ClientOption) *Client {
o := applyClientOptions(opts)
var transport http.RoundTripper = &http.Transport{
Proxy: o.transportConfig.Proxy,
DialContext: o.transportConfig.DialContext,
TLSClientConfig: o.transportConfig.TLSClientConfig,
TLSHandshakeTimeout: o.transportConfig.TLSHandshakeTimeout,
MaxIdleConns: o.transportConfig.MaxIdleConns,
MaxIdleConnsPerHost: o.transportConfig.MaxIdleConnsPerHost,
MaxConnsPerHost: o.transportConfig.MaxConnsPerHost,
IdleConnTimeout: o.transportConfig.IdleConnTimeout,
ResponseHeaderTimeout: o.transportConfig.ResponseHeaderTimeout,
ForceAttemptHTTP2: o.transportConfig.ForceAttemptHTTP2,
}
if o.limiter != nil {
transport = &httpz.RateLimitingRoundTripper{
Delegate: transport,
Limiter: o.limiter,
}
}
httpClient := &http.Client{
Transport: otelhttp.NewTransport(
transport,
otelhttp.WithPropagators(o.tracePropagator),
),
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
}
return &Client{
Backend: backend,
HTTPClient: &retryablehttp.Client{
HTTPClient: httpClient,
Logger: o.retryConfig.Logger,
RetryWaitMin: o.retryConfig.RetryWaitMin,
RetryWaitMax: o.retryConfig.RetryWaitMax,
RetryMax: o.retryConfig.RetryMax,
RequestLogHook: o.retryConfig.RequestLogHook,
ResponseLogHook: o.retryConfig.ResponseLogHook,
CheckRetry: o.retryConfig.CheckRetry,
Backoff: o.retryConfig.Backoff,
ErrorHandler: errorHandler,
},
HTTPClientNoRetry: &retryablehttp.Client{
HTTPClient: httpClient,
Logger: o.retryConfig.Logger,
RetryMax: 0,
RequestLogHook: o.retryConfig.RequestLogHook,
ResponseLogHook: o.retryConfig.ResponseLogHook,
CheckRetry: o.retryConfig.CheckRetry,
ErrorHandler: errorHandler,
},
AuthSecret: authSecret,
UserAgent: o.userAgent,
}
}
func (c *Client) Do(ctx context.Context, opts ...DoOption) error {
o, err := applyDoOptions(opts)
if err != nil {
return err
}
r, err := retryablehttp.NewRequestWithContext(ctx, o.method, c.targetUrl(o.path, o.query), o.body)
if err != nil {
return fmt.Errorf("NewRequest: %w", err)
}
if len(o.header) > 0 {
r.Header = o.header
}
if o.withJWT {
signedClaims, signErr := c.jwtSignature()
if signErr != nil {
return signErr
}
r.Header[jwtRequestHeader] = []string{signedClaims}
}
if c.UserAgent != "" {
r.Header[httpz.UserAgentHeader] = []string{c.UserAgent}
}
client := c.HTTPClient
if o.noRetry {
client = c.HTTPClientNoRetry
}
resp, err := client.Do(r) // nolint: bodyclose
if err != nil {
ctxErr := ctx.Err()
if ctxErr != nil {
err = ctxErr // assume request errored out because of context
}
}
return o.responseHandler.Handle(resp, err)
}
func (c *Client) jwtSignature() (string, error) {
now := time.Now()
claims := jwt.RegisteredClaims{
Issuer: jwtIssuer,
Audience: jwt.ClaimStrings{jwtGitLabAudience},
ExpiresAt: jwt.NewNumericDate(now.Add(jwtValidFor)),
NotBefore: jwt.NewNumericDate(now.Add(-jwtNotBefore)),
IssuedAt: jwt.NewNumericDate(now),
}
signedClaims, claimsErr := jwt.NewWithClaims(jwt.SigningMethodHS256, claims).
SignedString(c.AuthSecret)
if claimsErr != nil {
return "", fmt.Errorf("sign JWT: %w", claimsErr)
}
return signedClaims, nil
}
func (c *Client) targetUrl(path string, query url.Values) string {
u := *c.Backend
u.Path = joinUrlPaths(u.Path, path)
q := query // may be nil
if u.RawQuery != "" {
if len(q) == 0 {
// Nothing to do
} else {
// Merge queries
uq := u.Query()
for k, v := range q {
uq[k] = v
}
q = uq
}
}
u.RawQuery = q.Encode() // handles query == nil
return u.String()
}
// errorHandler returns the last response and error when ran out of retry attempts.
// It masks values of URL query parameters.
func errorHandler(resp *http.Response, err error, numTries int) (*http.Response, error) {
ue, ok := err.(*url.Error) // nolint: errorlint
if !ok {
return resp, err
}
u, parseErr := url.Parse(ue.URL)
if parseErr != nil {
return resp, err
}
if u.RawQuery != "" {
maskURLQueryParams(u)
ue.URL = u.String()
}
return resp, ue
}
func maskURLQueryParams(u *url.URL) {
newVal := []string{"x"}
q := u.Query()
for k := range q {
q[k] = newVal
}
u.RawQuery = q.Encode()
}
func joinUrlPaths(head, tail string) string {
if head == "" {
return tail
}
if tail == "" {
return head
}
head = strings.TrimSuffix(head, "/")
tail = strings.TrimPrefix(tail, "/")
return head + "/" + tail
}
|
