/
resourceDirectory.go
217 lines (184 loc) · 6.44 KB
/
resourceDirectory.go
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package service
import (
"errors"
"fmt"
"net/url"
"regexp"
"strconv"
"strings"
pbGRPC "github.com/plgd-dev/cloud/grpc-gateway/pb"
pbRA "github.com/plgd-dev/cloud/resource-aggregate/pb"
"github.com/plgd-dev/go-coap/v2/message"
coapCodes "github.com/plgd-dev/go-coap/v2/message/codes"
"github.com/plgd-dev/go-coap/v2/mux"
"github.com/plgd-dev/kit/codec/cbor"
"github.com/plgd-dev/kit/log"
"github.com/plgd-dev/kit/net/coap"
"github.com/plgd-dev/sdk/schema"
uuid "github.com/satori/go.uuid"
)
const observable = 2
type wkRd struct {
DeviceID string `json:"di"`
Links schema.ResourceLinks `json:"links"`
TimeToLive int `json:"ttl"`
TimeToLiveLegacy int `json:"lt"`
}
func fixTTL(w wkRd) wkRd {
// set time to live properly
if w.TimeToLive <= 0 {
w.TimeToLive = w.TimeToLiveLegacy
} else {
w.TimeToLiveLegacy = w.TimeToLive
}
return w
}
func isObservable(res *pbRA.Resource) bool {
return res.Policies != nil && res.Policies.BitFlags&observable == observable
}
// fixHref always lead by "/"
func fixHref(href string) string {
backslash := regexp.MustCompile(`\/+`)
p := backslash.ReplaceAllString(href, "/")
p = strings.TrimLeft(p, "/")
p = strings.TrimRight(p, "/")
return "/" + p
}
func resource2UUID(deviceID, href string) string {
return uuid.NewV5(uuid.NamespaceURL, deviceID+href).String()
}
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 resourceDirectoryPublishHandler(s mux.ResponseWriter, req *mux.Message, client *Client) {
authCtx := client.loadAuthorizationContext()
var w wkRd
err := cbor.ReadFrom(req.Body, &w)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("DeviceId: %v: cannot publish resource: %w", authCtx.DeviceId, err), coapCodes.BadRequest, req.Token)
return
}
if err := validatePublish(w); err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("DeviceId: %v: cannot publish resource: %w", authCtx.DeviceId, err), coapCodes.BadRequest, req.Token)
return
}
// set time to live properly
w = fixTTL(w)
links := make(schema.ResourceLinks, 0, len(w.Links))
for _, resource := range w.Links {
if resource.DeviceID == "" {
resource.DeviceID = w.DeviceID
}
resource, err := client.publishResource(req.Context, resource, int32(w.TimeToLive), client.remoteAddrString(), req.SequenceNumber, authCtx.AuthorizationContext)
if err != nil {
// publish resource is not critical, it cause unaccessible resource
log.Errorf("DeviceId %v: cannot handle coap req to publish resource: %v", authCtx.DeviceId, err)
} else {
links = append(links, resource)
}
}
if len(links) == 0 {
client.logAndWriteErrorResponse(fmt.Errorf("DeviceId: %v: cannot publish resource: empty links", authCtx.DeviceId), coapCodes.BadRequest, req.Token)
return
}
w.Links = links
for _, link := range links {
raLink := pbGRPC.SchemaResourceLinkToProto(link).ToRAProto()
err := client.observeResource(req.Context, &raLink, true)
if err != nil {
log.Errorf("DeviceId: %v: ResourceId: %v cannot observe published resource", link.DeviceID, link.ID)
}
}
accept := coap.GetAccept(req.Options)
encode, err := coap.GetEncoder(accept)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("DeviceId: %v: cannot publish resource: %w", authCtx.DeviceId, err), coapCodes.InternalServerError, req.Token)
return
}
out, err := encode(w)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("DeviceId: %v: cannot publish resource: %w", authCtx.DeviceId, err), coapCodes.InternalServerError, req.Token)
return
}
client.sendResponse(coapCodes.Changed, req.Token, accept, out)
}
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(s mux.ResponseWriter, req *mux.Message, client *Client) {
queries, err := req.Options.Queries()
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("cannot get queries: %w", err), coapCodes.BadRequest, req.Token)
return
}
deviceID, inss, err := parseUnpublishQueryString(queries)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("cannot parse queries: %w", err), coapCodes.BadRequest, req.Token)
return
}
rscs := client.getObservedResources(deviceID, inss)
if len(rscs) == 0 {
client.logAndWriteErrorResponse(fmt.Errorf("cannot found resources for the DELETE request parameters - with device ID and instance IDs %v, ", queries), coapCodes.BadRequest, req.Token)
return
}
client.unpublishResources(req.Context, rscs)
client.sendResponse(coapCodes.Deleted, req.Token, message.TextPlain, nil)
}
type resourceDirectorySelector struct {
SelectionCriteria int `json:"sel"`
}
func resourceDirectoryGetSelector(s mux.ResponseWriter, req *mux.Message, client *Client) {
var rds resourceDirectorySelector //we want to use sel:0 to prefer cloud RD
accept := coap.GetAccept(req.Options)
encode, err := coap.GetEncoder(accept)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("cannot get selector: %w", err), coapCodes.InternalServerError, req.Token)
return
}
out, err := encode(rds)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("cannot get selector: %w", err), coapCodes.InternalServerError, req.Token)
return
}
client.sendResponse(coapCodes.Content, req.Token, accept, out)
}
func resourceDirectoryHandler(s mux.ResponseWriter, req *mux.Message, client *Client) {
switch req.Code {
case coapCodes.POST:
resourceDirectoryPublishHandler(s, req, client)
case coapCodes.DELETE:
resourceDirectoryUnpublishHandler(s, req, client)
case coapCodes.GET:
resourceDirectoryGetSelector(s, req, client)
default:
client.logAndWriteErrorResponse(fmt.Errorf("Forbidden request from %v", client.remoteAddrString()), coapCodes.Forbidden, req.Token)
}
}