/
discoverDeviceCodec.go
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/
discoverDeviceCodec.go
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// ************************************************************************
// Copyright (C) 2022 plgd.dev, s.r.o.
//
// 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 core
import (
"errors"
"fmt"
"github.com/plgd-dev/device/v2/pkg/codec/ocf"
pkgError "github.com/plgd-dev/device/v2/pkg/error"
"github.com/plgd-dev/device/v2/schema"
"github.com/plgd-dev/go-coap/v3/message"
"github.com/plgd-dev/go-coap/v3/message/pool"
)
type DiscoverDeviceCodec struct{}
// ContentFormat propagates the CoAP media type.
func (c DiscoverDeviceCodec) ContentFormat() message.MediaType { return message.MediaType(0) }
// Encode propagates the payload without any conversions.
func (c DiscoverDeviceCodec) Encode(interface{}) ([]byte, error) {
return nil, MakeUnimplemented(pkgError.NotSupported())
}
type deviceLink struct {
DeviceID string `json:"di"`
Links schema.ResourceLinks `json:"links"`
}
func decodeDiscoverDevices(msg *pool.Message, resources *schema.ResourceLinks) error {
codec := ocf.VNDOCFCBORCodec{}
var devices []deviceLink
if err := codec.Decode(msg, &devices); err != nil {
return MakeInternal(fmt.Errorf("decoding %v failed: %w", ocf.DumpHeader(msg), err))
}
var resourceLinks schema.ResourceLinks
for _, device := range devices {
for _, link := range device.Links {
if link.Anchor == "" {
link.Anchor = "ocf://" + device.DeviceID
}
if link.DeviceID == "" {
link.DeviceID = device.DeviceID
}
resourceLinks = append(resourceLinks, link)
}
}
*resources = resourceLinks
return nil
}
// Decode validates the content format and
// propagates the payload to v as *schema.ResourceLinks
func (c DiscoverDeviceCodec) Decode(msg *pool.Message, v interface{}) error {
resources, ok := v.(*schema.ResourceLinks)
if !ok {
return MakeInvalidArgument(fmt.Errorf("invalid type %T", v))
}
mt, err := msg.Options().ContentFormat()
if err != nil {
return MakeUnimplemented(errors.New("content format not found"))
}
switch mt {
case message.AppOcfCbor:
codec := ocf.VNDOCFCBORCodec{}
if err := codec.Decode(msg, resources); err != nil {
return MakeInternal(fmt.Errorf("decoding %v failed: %w", ocf.DumpHeader(msg), err))
}
return nil
case message.AppCBOR:
return decodeDiscoverDevices(msg, resources)
}
return MakeInternal(fmt.Errorf("not a VNDOCFCBOR content format: %v", mt))
}