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/*
* Copyright 2018-2022 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 (
"io"
"net/http"
"net/url"
"time"
)
// 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"`
// 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"`
Type ExportType `json:"type,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
}
// 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.Account == "" {
vr.AddError("account to import from is not specified")
}
i.Subject.Validate(vr)
if i.IsService() && i.Subject.HasWildCards() {
vr.AddError("services cannot have wildcard subject: %q", i.Subject)
}
if i.IsStream() && i.To.HasWildCards() {
vr.AddError("streams cannot have wildcard to subject: %q", i.Subject)
}
var act *ActivationClaims
if i.Token != "" {
// Check to see if its an embedded JWT or a URL.
if u, err := url.Parse(i.Token); err == nil && u.Scheme != "" {
c := &http.Client{Timeout: 5 * time.Second}
resp, err := c.Get(u.String())
if err != nil {
vr.AddError("import %s contains an unreachable token URL %q", i.Subject, i.Token)
}
if resp != nil {
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
vr.AddError("import %s contains an unreadable token URL %q", i.Subject, i.Token)
} else {
act, err = DecodeActivationClaims(string(body))
if err != nil {
vr.AddError("import %s contains a URL %q with an invalid activation token", i.Subject, i.Token)
}
}
}
} else {
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]bool, len(*i))
for _, v := range *i {
if v == nil {
vr.AddError("null import is not allowed")
continue
}
if v.Type == Service {
if _, ok := toSet[v.To]; ok {
vr.AddError("Duplicate To subjects for %q", v.To)
}
toSet[v.To] = true
}
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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