Add search field to NostrFilter

rhodium-core/src/commonMain/kotlin/rhodium/nostr/NostrFilter.kt

@@ -13,6 +13,7 @@ class NostrFilter private constructor(
     @SerialName("#t") private val topicList: List<String>? = null,
     private val since: Long? = null,
     private val until: Long? = null,
+    private val search: String? = null,
     private val limit: Int = 1
 ) {
 
@@ -26,6 +27,7 @@ class NostrFilter private constructor(
           Topic:$topicList
         Since:$since
         Until:$until
+        Search:$search
         Limit:$limit  
     """.trimIndent()
 
@@ -42,6 +44,7 @@ class NostrFilter private constructor(
         private var topicList: List<String>? = null
         private var since: Long? = null
         private var until: Long? = null
+        private var search: String? = null
         private var limit: Int = 1
 
         fun idList(vararg iDList: String = emptyArray()) = apply {
@@ -76,6 +79,10 @@ class NostrFilter private constructor(
             until = timeStamp
         }
 
+        fun search(searchString: String? = null) = apply {
+            search = searchString
+        }
+
         fun limit(receivingEventLimit: Int) = apply {
             limit = receivingEventLimit
         }
@@ -89,6 +96,7 @@ class NostrFilter private constructor(
             topicList = topicList,
             since = since,
             until = until,
+            search = search,
             limit = limit
         )
     }

rhodium-core/src/commonTest/kotlin/rhodium/nostr/NostrFilterTest.kt

@@ -109,4 +109,21 @@ class NostrFilterTest {
         assertEquals(correctRequestJson, filterJson)
     }
 
+    @Test
+    fun `filter with search parameter serializes correctly`(){
+        val currentTimestamp = 1653822739L
+        val previousTimestamp = currentTimestamp - 24 * 60 * 60
+        val searchFilter = NostrFilter.newFilter()
+            .kinds(EventKind.TEXT_NOTE.kind)
+            .search("bitcoin")
+            .since(previousTimestamp)
+            .until(currentTimestamp)
+            .limit(10)
+            .build()
+        val filterJson = nostrFilterEventMapper.encodeToString(searchFilter)
+        val correctSearchJson = """{"kinds":[1],"since":1653736339,"until":1653822739,"search":"bitcoin","limit":10}"""
+        println("Search filter JSON: $filterJson")
+        assertEquals(correctSearchJson, filterJson)
+    }
+
 }