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session.go
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session.go
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package frontend
import (
"encoding/base64"
"net/http"
"net/url"
"strings"
"sync"
"github.com/gorilla/securecookie"
"github.com/gorilla/sessions"
"go.uber.org/zap"
"github.com/pydio/cells/common"
"github.com/pydio/cells/common/auth"
"github.com/pydio/cells/common/config"
"github.com/pydio/cells/common/log"
"github.com/pydio/cells/common/utils/net"
)
var (
sessionStores map[string]*sessions.CookieStore
sessionStoresLock *sync.Mutex
knownKey []byte
)
func init() {
sessionStores = make(map[string]*sessions.CookieStore)
sessionStoresLock = &sync.Mutex{}
}
func loadKey() []byte {
if knownKey != nil {
return knownKey
}
val := config.Get("frontend", "session", "secureKey").String()
var key []byte
if val == "" {
knownKey = securecookie.GenerateRandomKey(64)
val = base64.StdEncoding.EncodeToString(key)
config.Get("frontend", "session", "secureKey").Set(val)
config.Save(common.PYDIO_SYSTEM_USERNAME, "Generating session random key")
} else {
knownKey, _ = base64.StdEncoding.DecodeString(val)
}
return knownKey
}
func storeForUrl(u *url.URL) sessions.Store {
key := u.Scheme + "://" + u.Hostname()
sessionStoresLock.Lock()
defer sessionStoresLock.Unlock()
if ss, o := sessionStores[key]; o {
return ss
}
pKey := loadKey()
ss := sessions.NewCookieStore(pKey)
timeout := config.Get("frontend", "plugin", "gui.ajax", "SESSION_TIMEOUT").Default(60).Int()
ss.Options = &sessions.Options{
Path: "/a/frontend",
MaxAge: 60 * timeout,
HttpOnly: true,
}
if u.Scheme == "https" {
ss.Options.Secure = true
}
ss.Options.Domain = u.Hostname()
sessionStores[key] = ss
return ss
}
func GetSessionStore(req *http.Request) sessions.Store {
u := net.ExternalDomainFromRequest(req)
return storeForUrl(u)
}
// NewSessionWrapper creates a Http middleware checking if a cookie is passed
// along and if this cookie contains a proper JWT.
// The excludes parameter may be used to namely ignore specific "METHOD:/URI“ for this check.
func NewSessionWrapper(h http.Handler, excludes ...string) http.Handler {
jwtVerifier := auth.DefaultJWTVerifier()
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
for _, excluded := range excludes {
split := strings.Split(excluded, ":")
method := split[0]
uri := split[1]
if strings.ToLower(method) == strings.ToLower(r.Method) && strings.HasPrefix(r.RequestURI, uri) {
log.Logger(r.Context()).Debug("Skipping session wrapper by exclusion:" + excluded)
h.ServeHTTP(w, r)
return
}
}
sessionName := "pydio"
if h, ok := r.Header["X-Pydio-Minisite"]; ok {
sessionName = sessionName + "-" + strings.Join(h, "")
}
if h, ok := r.Header[common.XPydioFrontendSessionUuid]; ok {
sessionName = sessionName + "-" + strings.Join(h, "")
}
session, err := GetSessionStore(r).Get(r, sessionName)
if err != nil && !strings.Contains(err.Error(), "securecookie: the value is not valid") {
log.Logger(r.Context()).Error("Cannot retrieve session", zap.Error(err))
}
if value, ok := session.Values["access_token"]; ok {
ctx := r.Context()
if ctx, _, err = jwtVerifier.Verify(ctx, value.(string)); err == nil {
// Update context
log.Logger(ctx).Debug("Found token in session " + sessionName)
r = r.WithContext(ctx)
}
}
h.ServeHTTP(w, r)
})
}