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adapter.go
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adapter.go
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// Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0
// Package coap contains the domain concept definitions needed to support
// Magistrala CoAP adapter service functionality. All constant values are taken
// from RFC, and could be adjusted based on specific use case.
package coap
import (
"context"
"fmt"
"github.com/absmach/magistrala"
"github.com/absmach/magistrala/auth"
"github.com/absmach/magistrala/pkg/errors"
"github.com/absmach/magistrala/pkg/messaging"
)
const chansPrefix = "channels"
// ErrUnsubscribe indicates an error to unsubscribe.
var ErrUnsubscribe = errors.New("unable to unsubscribe")
// Service specifies CoAP service API.
type Service interface {
// Publish publishes message to specified channel.
// Key is used to authorize publisher.
Publish(ctx context.Context, key string, msg *messaging.Message) error
// Subscribes to channel with specified id, subtopic and adds subscription to
// service map of subscriptions under given ID.
Subscribe(ctx context.Context, key, chanID, subtopic string, c Client) error
// Unsubscribe method is used to stop observing resource.
Unsubscribe(ctx context.Context, key, chanID, subptopic, token string) error
}
var _ Service = (*adapterService)(nil)
// Observers is a map of maps,.
type adapterService struct {
auth magistrala.AuthzServiceClient
pubsub messaging.PubSub
}
// New instantiates the CoAP adapter implementation.
func New(authClient magistrala.AuthzServiceClient, pubsub messaging.PubSub) Service {
as := &adapterService{
auth: authClient,
pubsub: pubsub,
}
return as
}
func (svc *adapterService) Publish(ctx context.Context, key string, msg *messaging.Message) error {
ar := &magistrala.AuthorizeReq{
SubjectType: auth.ThingType,
Permission: auth.PublishPermission,
Subject: key,
Object: msg.GetChannel(),
ObjectType: auth.GroupType,
}
res, err := svc.auth.Authorize(ctx, ar)
if err != nil {
return errors.Wrap(errors.ErrAuthorization, err)
}
if !res.GetAuthorized() {
return errors.ErrAuthorization
}
msg.Publisher = res.GetId()
return svc.pubsub.Publish(ctx, msg.GetChannel(), msg)
}
func (svc *adapterService) Subscribe(ctx context.Context, key, chanID, subtopic string, c Client) error {
ar := &magistrala.AuthorizeReq{
SubjectType: auth.ThingType,
Permission: auth.SubscribePermission,
Subject: key,
Object: chanID,
ObjectType: auth.GroupType,
}
res, err := svc.auth.Authorize(ctx, ar)
if err != nil {
return errors.Wrap(errors.ErrAuthorization, err)
}
if !res.GetAuthorized() {
return errors.ErrAuthorization
}
subject := fmt.Sprintf("%s.%s", chansPrefix, chanID)
if subtopic != "" {
subject = fmt.Sprintf("%s.%s", subject, subtopic)
}
subCfg := messaging.SubscriberConfig{
ID: c.Token(),
Topic: subject,
Handler: c,
}
return svc.pubsub.Subscribe(ctx, subCfg)
}
func (svc *adapterService) Unsubscribe(ctx context.Context, key, chanID, subtopic, token string) error {
ar := &magistrala.AuthorizeReq{
Domain: "",
SubjectType: auth.ThingType,
Permission: auth.SubscribePermission,
Subject: key,
Object: chanID,
ObjectType: auth.GroupType,
}
res, err := svc.auth.Authorize(ctx, ar)
if err != nil {
return errors.Wrap(errors.ErrAuthorization, err)
}
if !res.GetAuthorized() {
return errors.ErrAuthorization
}
subject := fmt.Sprintf("%s.%s", chansPrefix, chanID)
if subtopic != "" {
subject = fmt.Sprintf("%s.%s", subject, subtopic)
}
return svc.pubsub.Unsubscribe(ctx, token, subject)
}