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resourceDirectory.go
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resourceDirectory.go
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package service
import (
"context"
"errors"
"fmt"
"io"
"net/url"
"regexp"
"strconv"
"strings"
"time"
"github.com/plgd-dev/device/v2/schema"
coapMessage "github.com/plgd-dev/go-coap/v3/message"
coapCodes "github.com/plgd-dev/go-coap/v3/message/codes"
"github.com/plgd-dev/go-coap/v3/message/pool"
"github.com/plgd-dev/go-coap/v3/mux"
"github.com/plgd-dev/hub/v2/coap-gateway/coapconv"
"github.com/plgd-dev/hub/v2/coap-gateway/resource"
"github.com/plgd-dev/hub/v2/resource-aggregate/commands"
raService "github.com/plgd-dev/hub/v2/resource-aggregate/service"
"github.com/plgd-dev/kit/v2/codec/cbor"
)
type wkRd struct {
DeviceID string `json:"di"`
Links schema.ResourceLinks `json:"links"`
TimeToLive int `json:"ttl"`
TimeToLiveLegacy int `json:"lt"`
}
func makeWkRd() wkRd {
return wkRd{
TimeToLive: -1,
TimeToLiveLegacy: -1,
}
}
func fixTimeToLive(w wkRd) wkRd {
// set time to live properly
if w.TimeToLive < 0 {
w.TimeToLive = w.TimeToLiveLegacy
} else {
w.TimeToLiveLegacy = w.TimeToLive
}
return w
}
// fixHref always lead by "/"
func fixHref(href string) string {
backslash := regexp.MustCompile(`\/+`)
p := backslash.ReplaceAllString(href, "/")
p = strings.TrimRight(p, "/")
if len(p) > 0 && p[0] == '/' {
return p
}
return "/" + p
}
func validatePublish(w wkRd) error {
if w.DeviceID == "" {
return errors.New("invalid DeviceId")
}
if len(w.Links) == 0 {
return errors.New("empty links")
}
if w.TimeToLive < 0 && w.TimeToLiveLegacy < 0 {
return errors.New("invalid TimeToLive")
}
return nil
}
func parsePublishedResources(data io.ReadSeeker, deviceID string) (wkRd, error) {
if data == nil {
return wkRd{}, fmt.Errorf("cannot read publish request body received from device %v: empty body", deviceID)
}
w := makeWkRd()
err := cbor.ReadFrom(data, &w)
if err != nil {
return wkRd{}, fmt.Errorf("cannot read publish request body received from device %v: %w", deviceID, err)
}
if err := validatePublish(w); err != nil {
return wkRd{}, fmt.Errorf("invalid publish request received from device %v: %w", deviceID, err)
}
w = fixTimeToLive(w)
for i, link := range w.Links {
w.Links[i].DeviceID = w.DeviceID
w.Links[i].Href = fixHref(link.Href)
w.Links[i].InstanceID = resource.GetInstanceID(link.Href)
}
return w, nil
}
func PublishResourceLinks(ctx context.Context, raClient raService.ResourceAggregateClient, links schema.ResourceLinks, deviceID string, ttl int32, connectionID string, sequence uint64) ([]*commands.Resource, error) {
var validUntil time.Time
if ttl > 0 {
validUntil = time.Now().Add(time.Second * time.Duration(ttl))
}
resources := commands.SchemaResourceLinksToResources(links, validUntil)
request := commands.PublishResourceLinksRequest{
Resources: resources,
DeviceId: deviceID,
CommandMetadata: &commands.CommandMetadata{
Sequence: sequence,
ConnectionId: connectionID,
},
}
resp, err := raClient.PublishResourceLinks(ctx, &request)
if err != nil {
return nil, fmt.Errorf("error occurred during resource links publish %w", err)
}
return resp.GetPublishedResources(), nil
}
func observeResources(ctx context.Context, client *session, w wkRd, sequenceNumber uint64) (coapCodes.Code, error) {
publishedResources, err := PublishResourceLinks(ctx, client.server.raClient, w.Links, w.DeviceID, int32(w.TimeToLive), client.RemoteAddr().String(), sequenceNumber)
if err != nil {
return coapCodes.BadRequest, fmt.Errorf("unable to publish resources for device %v: %w", w.DeviceID, err)
}
observeError := func(deviceID string, err error) error {
return fmt.Errorf("unable to observe published resources for device %v: %w", deviceID, err)
}
if err := client.server.taskQueue.Submit(func() {
obs, errObs := client.getDeviceObserver(ctx)
if errObs != nil {
client.Errorf("%w", observeError(w.DeviceID, errObs))
return
}
if errObs := obs.AddPublishedResources(ctx, publishedResources); errObs != nil {
client.Errorf("%w", observeError(w.DeviceID, errObs))
return
}
}); err != nil {
return coapCodes.InternalServerError, observeError(w.DeviceID, err)
}
return 0, nil
}
func resourceDirectoryPublishHandler(req *mux.Message, client *session) (*pool.Message, error) {
authCtx, err := client.GetAuthorizationContext()
if err != nil {
return nil, statusErrorf(coapCodes.Unauthorized, "cannot load authorization context: %w", err)
}
w, err := parsePublishedResources(req.Body(), authCtx.GetDeviceID())
if err != nil {
return nil, statusErrorf(coapCodes.BadRequest, "%w", err)
}
if errCode, err := observeResources(req.Context(), client, w, req.Sequence()); err != nil {
return nil, statusErrorf(errCode, "%w", err)
}
accept := coapconv.GetAccept(req.Options())
encode, err := coapconv.GetEncoder(accept)
if err != nil {
return nil, statusErrorf(coapCodes.InternalServerError, "%w", fmt.Errorf("unable to get encoder for accepted type %v requested: %w", accept, err))
}
out, err := encode(w)
if err != nil {
return nil, statusErrorf(coapCodes.InternalServerError, "%w", fmt.Errorf("unable to encode publish response: %w", err))
}
return client.createResponse(coapCodes.Changed, req.Token(), accept, out), nil
}
func parseUnpublishQueryString(queries []string) (deviceID string, instanceIDs []int64, err error) {
for _, q := range queries {
values, err := url.ParseQuery(q)
if err != nil {
return "", nil, fmt.Errorf("cannot parse unpublish query: %w", err)
}
if di := values.Get("di"); di != "" {
deviceID = di
}
if ins := values.Get("ins"); ins != "" {
i, err := strconv.Atoi(ins)
if err != nil {
return "", nil, fmt.Errorf("cannot convert %v to number", ins)
}
instanceIDs = append(instanceIDs, int64(i))
}
}
if deviceID == "" {
return "", nil, fmt.Errorf("deviceID not found")
}
return
}
func resourceDirectoryUnpublishHandler(req *mux.Message, client *session) (*pool.Message, error) {
authCtx, err := client.GetAuthorizationContext()
if err != nil {
return nil, statusErrorf(coapCodes.BadRequest, "%w", fmt.Errorf("cannot load authorization context: %w", err))
}
queries, err := req.Options().Queries()
if err != nil {
return nil, statusErrorf(coapCodes.BadRequest, "%w", fmt.Errorf("cannot query string from unpublish request: %w", err))
}
deviceID, inss, err := parseUnpublishQueryString(queries)
if err != nil {
return nil, statusErrorf(coapCodes.BadRequest, "%w", fmt.Errorf("unable to parse unpublish request queries: %w", err))
}
if deviceID != authCtx.GetDeviceID() {
return nil, statusErrorf(coapCodes.BadRequest, "%w", fmt.Errorf("unable to parse unpublish request query deviceId '%v': invalid deviceID", deviceID))
}
resources := client.unpublishResourceLinks(req.Context(), nil, inss)
if len(resources) == 0 {
return nil, statusErrorf(coapCodes.BadRequest, "%w", fmt.Errorf("cannot find observed resources using query %v which shall be unpublished", queries))
}
return client.createResponse(coapCodes.Deleted, req.Token(), coapMessage.TextPlain, nil), nil
}
type resourceDirectorySelector struct {
SelectionCriteria int `json:"sel"`
}
func resourceDirectoryGetSelector(req *mux.Message, client *session) (*pool.Message, error) {
var rds resourceDirectorySelector // we want to use sel:0 to prefer cloud RD
accept := coapconv.GetAccept(req.Options())
encode, err := coapconv.GetEncoder(accept)
if err != nil {
return nil, statusErrorf(coapCodes.InternalServerError, "%w", fmt.Errorf("cannot get selector: %w", err))
}
out, err := encode(rds)
if err != nil {
return nil, statusErrorf(coapCodes.InternalServerError, "%w", fmt.Errorf("cannot encode body for get selector: %w", err))
}
return client.createResponse(coapCodes.Content, req.Token(), accept, out), nil
}
func resourceDirectoryHandler(req *mux.Message, client *session) (*pool.Message, error) {
switch req.Code() {
case coapCodes.POST:
return resourceDirectoryPublishHandler(req, client)
case coapCodes.DELETE:
return resourceDirectoryUnpublishHandler(req, client)
case coapCodes.GET:
return resourceDirectoryGetSelector(req, client)
default:
return nil, statusErrorf(coapCodes.NotFound, "unsupported method %v", req.Code())
}
}