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subscription.go
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subscription.go
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package mercure
import (
"encoding/json"
"net/http"
"net/url"
"github.com/gorilla/mux"
"go.uber.org/zap"
)
const jsonldContext = "https://mercure.rocks/"
type subscription struct {
Context string `json:"@context,omitempty"`
ID string `json:"id"`
Type string `json:"type"`
Subscriber string `json:"subscriber"`
Topic string `json:"topic"`
Active bool `json:"active"`
LastEventID string `json:"lastEventID,omitempty"`
Payload interface{} `json:"payload,omitempty"`
}
type subscriptionCollection struct {
Context string `json:"@context"`
ID string `json:"id"`
Type string `json:"type"`
LastEventID string `json:"lastEventID"`
Subscriptions []subscription `json:"subscriptions"`
}
const (
subscriptionsPath = "/subscriptions"
subscriptionURL = defaultHubURL + subscriptionsPath + "/{topic}/{subscriber}"
subscriptionsForTopicURL = defaultHubURL + subscriptionsPath + "/{topic}"
subscriptionsURL = defaultHubURL + subscriptionsPath
)
func (h *Hub) SubscriptionsHandler(w http.ResponseWriter, r *http.Request) {
currentURL := r.URL.RequestURI()
lastEventID, subscribers, ok := h.initSubscription(currentURL, w, r)
if !ok {
return
}
w.WriteHeader(http.StatusOK)
subscriptionCollection := subscriptionCollection{
Context: jsonldContext,
ID: currentURL,
Type: "Subscriptions",
LastEventID: lastEventID,
Subscriptions: make([]subscription, 0),
}
vars := mux.Vars(r)
t, _ := url.QueryUnescape(vars["topic"])
for _, subscriber := range subscribers {
subscriptionCollection.Subscriptions = append(subscriptionCollection.Subscriptions, subscriber.getSubscriptions(t, "", true)...)
}
json, err := json.MarshalIndent(subscriptionCollection, "", " ")
if err != nil {
panic(err)
}
w.Write(json)
}
func (h *Hub) SubscriptionHandler(w http.ResponseWriter, r *http.Request) {
currentURL := r.URL.RequestURI()
lastEventID, subscribers, ok := h.initSubscription(currentURL, w, r)
if !ok {
return
}
vars := mux.Vars(r)
s, _ := url.QueryUnescape(vars["subscriber"])
t, _ := url.QueryUnescape(vars["topic"])
for _, subscriber := range subscribers {
if subscriber.ID != s {
continue
}
for _, subscription := range subscriber.getSubscriptions(t, jsonldContext, true) {
if subscription.Topic != t {
continue
}
subscription.LastEventID = lastEventID
json, err := json.MarshalIndent(subscription, "", " ")
if err != nil {
panic(err)
}
w.Write(json)
return
}
}
w.WriteHeader(http.StatusNotFound)
}
func (h *Hub) initSubscription(currentURL string, w http.ResponseWriter, r *http.Request) (lastEventID string, subscribers []*Subscriber, ok bool) {
if h.subscriberJWTKeyFunc != nil {
claims, err := authorize(r, h.subscriberJWTKeyFunc, nil, h.cookieName)
if err != nil || claims == nil || claims.Mercure.Subscribe == nil || !canReceive(h.topicSelectorStore, []string{currentURL}, claims.Mercure.Subscribe) {
h.httpAuthorizationError(w, r, err)
return "", nil, false
}
}
transport, ok := h.transport.(TransportSubscribers)
if !ok {
panic("The transport isn't an instance of hub.TransportSubscribers")
}
var err error
lastEventID, subscribers, err = transport.GetSubscribers()
if err != nil {
if c := h.logger.Check(zap.ErrorLevel, "Error retrieving subscribers"); c != nil {
c.Write(zap.Error(err))
}
w.WriteHeader(http.StatusInternalServerError)
return lastEventID, subscribers, ok
}
if r.Header.Get("If-None-Match") == lastEventID {
w.WriteHeader(http.StatusNotModified)
return "", nil, false
}
w.Header().Add("Content-Type", "application/ld+json")
w.Header().Add("ETag", lastEventID)
return lastEventID, subscribers, true
}