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cookies.go
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/
cookies.go
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package explore
import (
"encoding/base64"
"encoding/json"
"log"
"net/http"
"time"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/google/go-containerregistry/pkg/v1/remote/transport"
)
type CookieValue struct {
Reg string
PingResp *transport.PingResp
Repo string
TokenResponse *transport.TokenResponse
}
type RedirectCookie struct {
Digest string
Url string
}
func (h *handler) transportFromCookie(w http.ResponseWriter, r *http.Request, repo string, auth authn.Authenticator) (http.RoundTripper, error) {
parsed, err := name.NewRepository(repo)
if err != nil {
return nil, err
}
scopes := []string{parsed.Scope(transport.PullScope)}
reg := parsed.Registry
var (
pr *transport.PingResp
tok *transport.TokenResponse
)
if regCookie, err := r.Cookie("registry_token"); err == nil {
b, err := base64.URLEncoding.DecodeString(regCookie.Value)
if err != nil {
return nil, err
}
var v CookieValue
if err := json.Unmarshal(b, &v); err != nil {
return nil, err
}
if v.Reg == reg.String() {
pr = v.PingResp
if v.Repo == repo {
tok = v.TokenResponse
}
}
}
t := remote.DefaultTransport
t = transport.NewRetry(t)
if r.URL.Query().Get("trace") != "" {
t = transport.NewTracer(t)
}
if pr == nil {
if cpr, ok := h.pings[reg.String()]; ok {
if debug {
log.Printf("cached ping: %v", cpr)
}
pr = cpr
} else {
if debug {
log.Printf("pinging %s", reg.String())
}
pr, err = transport.Ping(r.Context(), reg, t)
if err != nil {
return nil, err
}
h.pings[reg.String()] = pr
}
}
if tok == nil {
if debug {
log.Printf("getting token %s", reg.String())
}
t, tok, err = transport.NewBearer(r.Context(), pr, reg, auth, t, scopes)
if err != nil {
return nil, err
}
// Probably no auth needed.
if tok == nil {
return t, nil
}
// Clear this to make cookies smaller.
tok.AccessToken = ""
v := &CookieValue{
Reg: reg.String(),
PingResp: pr,
Repo: repo,
TokenResponse: tok,
}
b, err := json.Marshal(v)
if err != nil {
return nil, err
}
cv := base64.URLEncoding.EncodeToString(b)
cookie := &http.Cookie{
Name: "registry_token",
Value: cv,
Secure: true,
HttpOnly: true,
SameSite: http.SameSiteLaxMode,
}
if tok.ExpiresIn == 0 {
tok.ExpiresIn = 60
}
exp := time.Now().Add(time.Second * time.Duration(tok.ExpiresIn))
cookie.Expires = exp
http.SetCookie(w, cookie)
} else {
if debug {
log.Printf("restoring bearer %s", reg.String())
}
t, err = transport.OldBearer(pr, tok, reg, auth, t, scopes)
if err != nil {
return nil, err
}
}
return t, nil
}