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/*
* Copyright 2018-2020 The NATS Authors
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jwt
// Import describes a mapping from another account into this one
type Import struct {
Name string `json:"name,omitempty"`
// Subject field in an import is always from the perspective of the
// initial publisher - in the case of a stream it is the account owning
// the stream (the exporter), and in the case of a service it is the
// account making the request (the importer).
Subject Subject `json:"subject,omitempty"`
Account string `json:"account,omitempty"`
Token string `json:"token,omitempty"`
// Deprecated: use LocalSubject instead
// To field in an import is always from the perspective of the subscriber
// in the case of a stream it is the client of the stream (the importer),
// from the perspective of a service, it is the subscription waiting for
// requests (the exporter). If the field is empty, it will default to the
// value in the Subject field.
To Subject `json:"to,omitempty"`
// Local subject used to subscribe (for streams) and publish (for services) to.
// This value only needs setting if you want to change the value of Subject.
// If the value of Subject ends in > then LocalSubject needs to end in > as well.
// LocalSubject can contain $<number> wildcard references where number references the nth wildcard in Subject.
// The sum of wildcard reference and * tokens needs to match the number of * token in Subject.
LocalSubject RenamingSubject `json:"local_subject,omitempty"`
Type ExportType `json:"type,omitempty"`
Share bool `json:"share,omitempty"`
AllowTrace bool `json:"allow_trace,omitempty"`
}
// IsService returns true if the import is of type service
func (i *Import) IsService() bool {
return i.Type == Service
}
// IsStream returns true if the import is of type stream
func (i *Import) IsStream() bool {
return i.Type == Stream
}
// Returns the value of To without triggering the deprecation warning for a read
func (i *Import) GetTo() string {
return string(i.To)
}
// Validate checks if an import is valid for the wrapping account
func (i *Import) Validate(actPubKey string, vr *ValidationResults) {
if i == nil {
vr.AddError("null import is not allowed")
return
}
if !i.IsService() && !i.IsStream() {
vr.AddError("invalid import type: %q", i.Type)
}
if i.IsService() && i.AllowTrace {
vr.AddError("AllowTrace only valid for stream import")
}
if i.Account == "" {
vr.AddError("account to import from is not specified")
}
if i.GetTo() != "" {
vr.AddWarning("the field to has been deprecated (use LocalSubject instead)")
}
i.Subject.Validate(vr)
if i.LocalSubject != "" {
i.LocalSubject.Validate(i.Subject, vr)
if i.To != "" {
vr.AddError("Local Subject replaces To")
}
}
if i.Share && !i.IsService() {
vr.AddError("sharing information (for latency tracking) is only valid for services: %q", i.Subject)
}
var act *ActivationClaims
if i.Token != "" {
var err error
act, err = DecodeActivationClaims(i.Token)
if err != nil {
vr.AddError("import %q contains an invalid activation token", i.Subject)
}
}
if act != nil {
if !(act.Issuer == i.Account || act.IssuerAccount == i.Account) {
vr.AddError("activation token doesn't match account for import %q", i.Subject)
}
if act.ClaimsData.Subject != actPubKey {
vr.AddError("activation token doesn't match account it is being included in, %q", i.Subject)
}
if act.ImportType != i.Type {
vr.AddError("mismatch between token import type %s and type of import %s", act.ImportType, i.Type)
}
act.validateWithTimeChecks(vr, false)
subj := i.Subject
if i.IsService() && i.To != "" {
subj = i.To
}
if !subj.IsContainedIn(act.ImportSubject) {
vr.AddError("activation token import subject %q doesn't match import %q", act.ImportSubject, i.Subject)
}
}
}
// Imports is a list of import structs
type Imports []*Import
// Validate checks if an import is valid for the wrapping account
func (i *Imports) Validate(acctPubKey string, vr *ValidationResults) {
toSet := make(map[Subject]struct{}, len(*i))
for _, v := range *i {
if v == nil {
vr.AddError("null import is not allowed")
continue
}
if v.Type == Service {
sub := v.To
if sub == "" {
sub = v.LocalSubject.ToSubject()
}
if sub == "" {
sub = v.Subject
}
for k := range toSet {
if sub.IsContainedIn(k) || k.IsContainedIn(sub) {
vr.AddError("overlapping subject namespace for %q and %q", sub, k)
}
}
if _, ok := toSet[sub]; ok {
vr.AddError("overlapping subject namespace for %q", v.To)
}
toSet[sub] = struct{}{}
}
v.Validate(acctPubKey, vr)
}
}
// Add is a simple way to add imports
func (i *Imports) Add(a ...*Import) {
*i = append(*i, a...)
}
func (i Imports) Len() int {
return len(i)
}
func (i Imports) Swap(j, k int) {
i[j], i[k] = i[k], i[j]
}
func (i Imports) Less(j, k int) bool {
return i[j].Subject < i[k].Subject
}
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