/
subscribeToResouce.go
174 lines (152 loc) · 5.51 KB
/
subscribeToResouce.go
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package service
import (
"context"
"fmt"
"io"
"net/http"
"net/url"
"github.com/go-ocf/cloud/cloud2cloud-connector/events"
oapiStore "github.com/go-ocf/cloud/cloud2cloud-connector/store"
"github.com/go-ocf/cloud/cloud2cloud-gateway/store"
"github.com/go-ocf/kit/codec/json"
kitNetGrpc "github.com/go-ocf/kit/net/grpc"
"github.com/gofrs/uuid"
pbAS "github.com/go-ocf/cloud/authorization/pb"
cqrsRA "github.com/go-ocf/cloud/resource-aggregate/cqrs"
pbRA "github.com/go-ocf/cloud/resource-aggregate/pb"
"github.com/gorilla/mux"
)
func (rh *RequestHandler) IsAuthorized(ctx context.Context, r *http.Request, deviceID string) error {
token, err := getAccessToken(r)
if err != nil {
return fmt.Errorf("cannot authorized: cannot get users devices: %w", err)
}
getUserDevicesClient, err := rh.asClient.GetUserDevices(kitNetGrpc.CtxWithToken(ctx, token), &pbAS.GetUserDevicesRequest{
DeviceIdsFilter: []string{deviceID},
})
if err != nil {
return fmt.Errorf("cannot authorized: cannot get users devices: %w", err)
}
defer getUserDevicesClient.CloseSend()
for {
userDevice, err := getUserDevicesClient.Recv()
if err == io.EOF {
break
}
if err != nil {
return fmt.Errorf("cannot authorized: cannot get users devices: %w", err)
}
if userDevice.DeviceId == deviceID {
return nil
}
}
return fmt.Errorf("cannot authorized: access denied")
}
type SubscriptionResponse struct {
SubscriptionID string `json:"subscriptionId"`
}
func (rh *RequestHandler) makeSubscription(w http.ResponseWriter, r *http.Request, typ oapiStore.Type, userID string, validEventTypes []events.EventType) (store.Subscription, int, error) {
var res store.Subscription
var req events.SubscriptionRequest
err := json.ReadFrom(r.Body, &req)
if err != nil {
return res, http.StatusBadRequest, fmt.Errorf("cannot decode request body: %w", err)
}
_, err = url.Parse(req.URL)
if err != nil {
return res, http.StatusBadRequest, fmt.Errorf("invalid eventsurl(%v)", err)
}
eventTypes := make([]events.EventType, 0, 10)
for _, r := range req.EventTypes {
ev := events.EventType(r)
for _, v := range validEventTypes {
if ev == v {
eventTypes = append(eventTypes, ev)
}
}
}
if len(eventTypes) == 0 {
return res, http.StatusBadRequest, fmt.Errorf("invalid eventtypes(%v)", err)
}
res.ID = uuid.Must(uuid.NewV4()).String()
res.EventTypes = eventTypes
res.URL = req.URL
res.CorrelationID = r.Header.Get(events.CorrelationIDKey)
res.ContentType = r.Header.Get(events.ContentTypeKey)
res.UserID = userID
res.SigningSecret = req.SigningSecret
res.Type = typ
return res, http.StatusOK, nil
}
func (rh *RequestHandler) subscribeToResource(w http.ResponseWriter, r *http.Request) (int, error) {
routeVars := mux.Vars(r)
deviceID := routeVars[deviceIDKey]
href := routeVars[resourceLinkHrefKey]
err := rh.IsAuthorized(r.Context(), r, deviceID)
if err != nil {
return http.StatusUnauthorized, err
}
_, userID, err := parseAuth(r.Header.Get("Authorization"))
if err != nil {
return http.StatusBadRequest, fmt.Errorf("cannot parse authorization header: %w", err)
}
s, code, err := rh.makeSubscription(w, r, oapiStore.Type_Resource, userID, []events.EventType{events.EventType_ResourceChanged})
if err != nil {
return code, err
}
_, err = rh.resourceProjection.Register(r.Context(), deviceID)
if err != nil {
return http.StatusBadRequest, fmt.Errorf("cannot register to resource projection: %w", err)
}
resourceID := cqrsRA.MakeResourceId(deviceID, href)
models := rh.resourceProjection.Models(deviceID, resourceID)
if len(models) == 0 {
err = rh.resourceProjection.ForceUpdate(r.Context(), deviceID, href)
if err != nil {
rh.resourceProjection.Unregister(deviceID)
return http.StatusBadRequest, fmt.Errorf("cannot load resource: %w", err)
}
}
s.DeviceID = deviceID
s.Href = href
err = rh.store.SaveSubscription(r.Context(), s)
if err != nil {
return http.StatusBadRequest, fmt.Errorf("cannot save subscription: %w", err)
}
models = rh.resourceProjection.Models(deviceID, resourceID)
for _, m := range models {
resourceCtx := m.(*resourceCtx).Clone()
if resourceCtx.content.GetStatus() != pbRA.Status_OK && resourceCtx.content.GetStatus() != pbRA.Status_UNKNOWN {
rh.store.PopSubscription(r.Context(), s.ID)
rh.resourceProjection.Unregister(deviceID)
return statusToHttpStatus(resourceCtx.content.GetStatus()), fmt.Errorf("cannot prepare content to emit first event: %w", err)
}
rep, err := unmarshalContent(resourceCtx.content.GetContent())
if err != nil {
rh.store.PopSubscription(r.Context(), s.ID)
rh.resourceProjection.Unregister(deviceID)
return http.StatusBadRequest, fmt.Errorf("cannot prepare content to emit first event: %w", err)
}
_, err = emitEvent(r.Context(), events.EventType_ResourceChanged, s, rh.store.IncrementSubscriptionSequenceNumber, rep)
if err != nil {
rh.store.PopSubscription(r.Context(), s.ID)
rh.resourceProjection.Unregister(deviceID)
return http.StatusBadRequest, fmt.Errorf("cannot emit event: %w", err)
}
}
err = jsonResponseWriterEncoder(w, SubscriptionResponse{
SubscriptionID: s.ID,
})
if err != nil {
rh.store.PopSubscription(r.Context(), s.ID)
rh.resourceProjection.Unregister(deviceID)
return http.StatusBadRequest, fmt.Errorf("cannot write response: %w", err)
}
return http.StatusOK, nil
}
func (rh *RequestHandler) SubscribeToResource(w http.ResponseWriter, r *http.Request) {
statusCode, err := rh.subscribeToResource(w, r)
if err != nil {
logAndWriteErrorResponse(fmt.Errorf("cannot subscribe to resource: %w", err), statusCode, w)
}
}