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resourceDirectory.go
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resourceDirectory.go
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package service
import (
"errors"
"fmt"
"net/url"
"regexp"
"strconv"
"strings"
"github.com/plgd-dev/device/v2/schema"
"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/mux"
"github.com/plgd-dev/hub/v2/coap-gateway/coapconv"
"github.com/plgd-dev/kit/v2/codec/cbor"
)
type PublishRequest struct {
DeviceID string `json:"di"`
Links schema.ResourceLinks `json:"links"`
TimeToLive int `json:"ttl"`
SequenceNumber uint64 `json:"-"`
}
type UnpublishRequest struct {
DeviceID string
InstanceIDs []int64
}
func makePublishRequest() PublishRequest {
return PublishRequest{
TimeToLive: -1,
}
}
// 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 resourceDirectoryPublishHandler(req *mux.Message, client *Client) {
p := makePublishRequest()
err := cbor.ReadFrom(req.Body(), &p)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("cannot read publish request body received: %w", err), coapCodes.BadRequest, req.Token())
return
}
for i, link := range p.Links {
p.Links[i].DeviceID = p.DeviceID
p.Links[i].Href = fixHref(link.Href)
}
p.SequenceNumber = req.Sequence()
if err = client.handler.PublishResources(p); err != nil {
client.logAndWriteErrorResponse(err, coapCodes.InternalServerError, req.Token())
return
}
accept := coapconv.GetAccept(req.Options())
encode, err := coapconv.GetEncoder(accept)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("unable to get encoder for accepted type %v: %w", accept, err), coapCodes.InternalServerError, req.Token())
return
}
out, err := encode(p)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("unable to encode publish response: %w", err), coapCodes.InternalServerError, req.Token())
return
}
client.sendResponse(coapCodes.Changed, req.Token(), accept, out)
}
func parseUnpublishRequestFromQuery(queries []string) (UnpublishRequest, error) {
req := UnpublishRequest{}
for _, q := range queries {
values, err := url.ParseQuery(q)
if err != nil {
return UnpublishRequest{}, fmt.Errorf("cannot parse unpublish query: %w", err)
}
if di := values.Get("di"); di != "" {
req.DeviceID = di
}
if ins := values.Get("ins"); ins != "" {
i, err := strconv.Atoi(ins)
if err != nil {
return UnpublishRequest{}, fmt.Errorf("cannot convert %v to number", ins)
}
req.InstanceIDs = append(req.InstanceIDs, int64(i))
}
}
if req.DeviceID == "" {
return UnpublishRequest{}, errors.New("deviceID not found")
}
return req, nil
}
func resourceDirectoryUnpublishHandler(req *mux.Message, client *Client) {
queries, err := req.Options().Queries()
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("cannot query string from unpublish request from device %v: %w", client.GetDeviceID(), err), coapCodes.BadRequest, req.Token())
return
}
r, err := parseUnpublishRequestFromQuery(queries)
if err != nil {
client.logAndWriteErrorResponse(fmt.Errorf("unable to parse unpublish request query string from device %v: %w", client.GetDeviceID(), err), coapCodes.BadRequest, req.Token())
return
}
err = client.handler.UnpublishResources(r)
if err != nil {
client.logAndWriteErrorResponse(err, coapCodes.InternalServerError, req.Token())
return
}
client.sendResponse(coapCodes.Deleted, req.Token(), message.TextPlain, nil)
}
func resourceDirectoryHandler(req *mux.Message, client *Client) {
switch req.Code() {
case coapCodes.POST:
resourceDirectoryPublishHandler(req, client)
case coapCodes.DELETE:
resourceDirectoryUnpublishHandler(req, client)
default:
client.logAndWriteErrorResponse(fmt.Errorf("forbidden request from %v", client.RemoteAddrString()), coapCodes.Forbidden, req.Token())
}
}