Add ability to customize webhook body

types/config.ts

@@ -58,11 +58,19 @@ export type Notification = {
   webhook?: Webhook
 }
 
-export type Webhook = {
+export type Webhook<TEnv = Env> = {
   url: string
   method?: 'POST' | 'GET'
   headers?: { [key: string]: string | number }
   timeout?: number
+  body?: (
+    env: TEnv,
+    monitor: MonitorTarget,
+    isUp: boolean,
+    timeIncidentStart: number,
+    timeNow: number,
+    reason: string
+  ) => { [key: string]: any } | string
 }
 
 export type Callbacks<TEnv = Env> = {

uptime.config.ts

@@ -102,6 +102,19 @@ const workerConfig: WorkerConfig = {
         // [Optional] header defaults to Content-Type: application/json, additional properties will be merged, example of authorization header below
         'Authorization': 'Bearer YOUR_TOKEN_HERE',
       },
+      // [Optional] body to be sent, could be an object or a string
+      // if it's an object, it will be sent as JSON
+      // if it's a string, it will be sent as-is
+      body: (env, monitor, isUp, timeIncidentStart, timeNow, reason) => {
+        return {
+          event: 'status_change',
+          monitor,
+          isUp,
+          timeIncidentStart,
+          timeNow,
+          reason,
+        }
+      },
       // [Optional] timeout in millisecond, defaults to 30000
       timeout: 30000,
     },

worker/src/index.ts

@@ -50,6 +50,25 @@ const Worker = {
         const controller = new AbortController()
         const timeoutId = setTimeout(() => controller.abort(), workerConfig.notification.webhook.timeout ?? 30000) // 30 second default timeout
         const headers = { 'Content-Type': 'application/json' }
+        let body: { [key: string]: any } | string
+        if(workerConfig.notification.webhook.body) {
+          body = workerConfig.notification.webhook.body(
+            env,
+            monitor,
+            isUp,
+            timeIncidentStart,
+            timeNow,
+            reason
+          )
+        } else {
+          body = {
+            monitor,
+            isUp,
+            timeIncidentStart,
+            timeNow,
+            reason,
+          }
+        }
         if(workerConfig.notification.webhook.headers) {
           Object.assign(headers, workerConfig.notification.webhook.headers)
         }
@@ -57,14 +76,7 @@ const Worker = {
           await fetch(workerConfig.notification.webhook.url, {
             method: workerConfig.notification.webhook.method ?? 'POST',
             headers,
-            body: JSON.stringify({
-              event: 'status_change',
-              monitor,
-              isUp,
-              timeIncidentStart,
-              timeNow,
-              reason,
-            }),
+            body: typeof body === 'object' ? JSON.stringify(body) : body,
             signal: controller.signal,
           })
         } finally {