feat(ntfy): add the HTTP client, stream manager, and account discovery

Speak the ntfy JSON API directly: subscribe, publish, group topics that share a server and credentials, reconnect with backoff and a since cursor, and list account subscriptions, reservations, and ACL grants.

internal/ntfy/event_test.go

@@ -0,0 +1,37 @@
+package ntfy
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestParseLine(t *testing.T) {
+	ev, ok, err := ParseLine([]byte(`{"id":"abc","time":10,"event":"message","topic":"alerts","message":"hi","priority":5}`))
+	if err != nil || !ok {
+		t.Fatal(err, ok)
+	}
+	if ev.ID != "abc" || ev.Priority != 5 || ev.Message != "hi" {
+		t.Fatalf("%+v", ev)
+	}
+	if _, ok, err := ParseLine([]byte("  ")); err != nil || ok {
+		t.Fatalf("blank: %v %v", err, ok)
+	}
+	if _, _, err := ParseLine([]byte("{")); err == nil {
+		t.Fatal("expected json error")
+	}
+}
+
+func TestReadLinesSkipsGarbage(t *testing.T) {
+	var got []string
+	var bad int
+	err := ReadLines(strings.NewReader("nope\n{\"id\":\"a\",\"time\":1,\"event\":\"open\",\"topic\":\"t\"}\n"), func(ev Event) error {
+		got = append(got, ev.Event)
+		return nil
+	}, func(error) { bad++ })
+	if err != nil {
+		t.Fatal(err)
+	}
+	if bad != 1 || len(got) != 1 || got[0] != "open" {
+		t.Fatalf("bad=%d got=%v", bad, got)
+	}
+}