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110 lines
3.0 KiB
Go
110 lines
3.0 KiB
Go
package middleware
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import (
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"context"
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"net/http"
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"strings"
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"time"
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"github.com/zitadel/logging"
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"github.com/zitadel/zitadel/internal/api/authz"
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http_utils "github.com/zitadel/zitadel/internal/api/http"
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"github.com/zitadel/zitadel/internal/errors"
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"github.com/zitadel/zitadel/internal/id"
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)
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type cookieKey int
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var (
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userAgentKey cookieKey = 0
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)
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func UserAgentIDFromCtx(ctx context.Context) (string, bool) {
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userAgentID, ok := ctx.Value(userAgentKey).(string)
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return userAgentID, ok
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}
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type UserAgent struct {
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ID string
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}
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type userAgentHandler struct {
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cookieHandler *http_utils.CookieHandler
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cookieName string
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idGenerator id.Generator
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nextHandler http.Handler
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ignoredPrefixes []string
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}
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type UserAgentCookieConfig struct {
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Name string
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MaxAge time.Duration
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}
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func NewUserAgentHandler(config *UserAgentCookieConfig, cookieKey []byte, idGenerator id.Generator, externalSecure bool, ignoredPrefixes ...string) (func(http.Handler) http.Handler, error) {
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opts := []http_utils.CookieHandlerOpt{
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http_utils.WithEncryption(cookieKey, cookieKey),
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http_utils.WithMaxAge(int(config.MaxAge.Seconds())),
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}
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if !externalSecure {
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opts = append(opts, http_utils.WithUnsecure())
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}
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return func(handler http.Handler) http.Handler {
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return &userAgentHandler{
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nextHandler: handler,
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cookieName: config.Name,
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cookieHandler: http_utils.NewCookieHandler(opts...),
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idGenerator: idGenerator,
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ignoredPrefixes: ignoredPrefixes,
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}
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}, nil
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}
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func (ua *userAgentHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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for _, prefix := range ua.ignoredPrefixes {
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if strings.HasPrefix(r.URL.Path, prefix) {
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ua.nextHandler.ServeHTTP(w, r)
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return
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}
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}
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agent, err := ua.getUserAgent(r)
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if err != nil {
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agent, err = ua.newUserAgent()
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}
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if err == nil {
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ctx := context.WithValue(r.Context(), userAgentKey, agent.ID)
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instance := authz.GetInstance(r.Context())
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allowedHosts := instance.SecurityPolicyAllowedOrigins()
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r = r.WithContext(ctx)
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err = ua.setUserAgent(w, r.Host, agent, len(allowedHosts) > 0)
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logging.WithFields("instanceID", instance.InstanceID()).OnError(err).Error("unable to set user agent cookie")
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}
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ua.nextHandler.ServeHTTP(w, r)
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}
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func (ua *userAgentHandler) newUserAgent() (*UserAgent, error) {
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agentID, err := ua.idGenerator.Next()
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if err != nil {
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return nil, err
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}
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return &UserAgent{ID: agentID}, nil
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}
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func (ua *userAgentHandler) getUserAgent(r *http.Request) (*UserAgent, error) {
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userAgent := new(UserAgent)
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err := ua.cookieHandler.GetEncryptedCookieValue(r, ua.cookieName, userAgent)
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if err != nil {
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return nil, errors.ThrowPermissionDenied(err, "HTTP-YULqH4", "cannot read user agent cookie")
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}
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return userAgent, nil
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}
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func (ua *userAgentHandler) setUserAgent(w http.ResponseWriter, host string, agent *UserAgent, iframe bool) error {
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err := ua.cookieHandler.SetEncryptedCookie(w, ua.cookieName, host, agent, iframe)
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if err != nil {
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return errors.ThrowPermissionDenied(err, "HTTP-AqgqdA", "cannot set user agent cookie")
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}
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return nil
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}
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