Add SSE for Razorpay QR events

src/main/kotlin/com/android/trisolarisserver/controller/RazorpayQrPayments.kt

@@ -1,6 +1,7 @@
 package com.android.trisolarisserver.controller
 
 import com.android.trisolarisserver.component.PropertyAccess
+import com.android.trisolarisserver.component.RazorpayQrEvents
 import com.android.trisolarisserver.controller.dto.RazorpayQrGenerateRequest
 import com.android.trisolarisserver.controller.dto.RazorpayQrEventResponse
 import com.android.trisolarisserver.controller.dto.RazorpayQrGenerateResponse
@@ -30,6 +31,7 @@ import org.springframework.web.client.RestTemplate
 import org.springframework.web.server.ResponseStatusException
 import org.springframework.http.HttpStatus
 import org.springframework.transaction.annotation.Transactional
+import org.springframework.web.servlet.mvc.method.annotation.SseEmitter
 import java.time.OffsetDateTime
 import java.util.Base64
 import java.util.UUID
@@ -42,6 +44,7 @@ class RazorpayQrPayments(
     private val settingsRepo: RazorpaySettingsRepo,
     private val qrRequestRepo: RazorpayQrRequestRepo,
     private val webhookLogRepo: RazorpayWebhookLogRepo,
+    private val qrEvents: RazorpayQrEvents,
     private val restTemplate: RestTemplate,
     private val objectMapper: ObjectMapper
 ) {
@@ -259,6 +262,17 @@ class RazorpayQrPayments(
         return out
     }
 
+    @GetMapping("/qr/{qrId}/events/stream", produces = [MediaType.TEXT_EVENT_STREAM_VALUE])
+    fun streamQrEvents(
+        @PathVariable propertyId: UUID,
+        @PathVariable bookingId: UUID,
+        @PathVariable qrId: String,
+        @AuthenticationPrincipal principal: MyPrincipal?
+    ): SseEmitter {
+        requireRole(propertyAccess, propertyId, principal, Role.ADMIN, Role.MANAGER, Role.STAFF)
+        return qrEvents.subscribe(propertyId, qrId)
+    }
+
     @GetMapping("/qr")
     fun listQr(
         @PathVariable propertyId: UUID,