'Set a reminder' API support

backend/handler.go

@@ -419,6 +419,9 @@ func patchUserNotifySettings(w http.ResponseWriter, r *http.Request) {
 		if v, ok := body["notify"].(bool); ok {
 			data.Enabled = v
 		}
+		if v, ok := body["iostart"].(bool); ok {
+			data.IOStart = v
+		}
 		if sub, ok := body["subscriber"].(string); ok {
 			url, ok := body["endpoint"].(string)
 			if !ok || url == "" {

backend/handler_test.go

@@ -701,6 +701,7 @@ func TestStoreUserPushConfig(t *testing.T) {
     "notify": true,
     "subscriber": "sub-id",
     "endpoint": "https://test",
+    "iostart": true,
     "ioext": {
       "name": "Amsterdam",
       "lat": 52.37607,
@@ -712,6 +713,7 @@ func TestStoreUserPushConfig(t *testing.T) {
 		Enabled:     true,
 		Subscribers: []string{"sub-id"},
 		Endpoints:   []string{"https://test"},
+		IOStart:     true,
 		Ext: ioExtPush{
 			Enabled: true,
 			Name:    "Amsterdam",

backend/push.go

@@ -50,6 +50,7 @@ type userPush struct {
 	userID string
 
 	Enabled     bool     `json:"notify" datastore:"on"`
+	IOStart     bool     `json:"iostart" datastore:"io"`
 	Subscribers []string `json:"subscribers,omitempty" datastore:"subs,noindex"`
 	Endpoints   []string `json:"-" datastore:"urls,noindex"`
 

docs/API.md

@@ -114,6 +114,7 @@ Current notification state. Response body sample:
 {
   "notify": true,
   "subscribers": ["123456789", "987654321"],
+  "iostart": true,
   "ioext": {
     "name": "Amsterdam",
     "lat": 52.37607,
@@ -131,13 +132,20 @@ Current notification state. Response body sample:
 
 * Toggle global notification state on/off: `notify`.
 * Add to the subscriber IDs list of a user: `subscriber` and `endpoint`.
+* Receive a notification about the start of I/O: `iostart`.
 * Subscribe/unsubscribe from "I/O Extended events near me": `ioext`.
 
+The start of I/O reminder is 1 day before the date.
+Session reminders are 10 min before the start time.
+Notifications about I/O Extended and any changes to the bookmarked sessions,
+including added videos, are sent immediately.
+
 ```json
 {
   "notify": true,
   "subscriber": "subscriber ID",
   "endpoint": "https://push/notifications/endpoint",
+  "iostart": true,
   "ioext": {
     "name": "Amsterdam",
     "lat": 52.37607,