✨ a working SoundCloudThumbnailFinder

songfinder-app/src/main/kotlin/mikufan/cx/songfinder/backend/component/thumbnailfinder/SoundCloudThumbnailFinder.kt

@@ -0,0 +1,59 @@
+package mikufan.cx.songfinder.backend.component.thumbnailfinder
+
+import com.fasterxml.jackson.databind.JsonNode
+import io.ktor.client.*
+import io.ktor.client.call.*
+import io.ktor.client.request.*
+import io.ktor.http.*
+import kotlinx.coroutines.withContext
+import mikufan.cx.songfinder.backend.db.entity.PvService
+import mikufan.cx.songfinder.backend.model.PVInfo
+import mikufan.cx.songfinder.backend.model.ThumbnailInfo
+import mikufan.cx.songfinder.backend.util.MyDispatchers
+import org.springframework.stereotype.Component
+
+@Component
+class SoundCloudThumbnailFinder(
+  private val client: HttpClient,
+) : ThumbnailFinder {
+  override val matchedPvService = PvService.SoundCloud
+
+  companion object {
+    // https://stackoverflow.com/questions/65352609/how-can-i-get-a-client-id
+    private val CLIENT_IDS = listOf(
+      "a3e059563d7fd3372b49b37f00a00bcf",
+      "RMDyLXBETEYF6qcE4jmndm0VF1QZt2T4"
+    )
+    private val RANDOM_CLIENT_ID: String
+      get() = CLIENT_IDS.random()
+  }
+
+  override suspend fun findThumbnail(pv: PVInfo): ThumbnailInfo {
+    val id = pv.id.split(" ").first()
+    val rsp = withContext(MyDispatchers.ioDispatcher) {
+      client.get("https://api-v2.soundcloud.com/tracks/") {
+        url {
+          appendEncodedPathSegments(id)
+          parameters["client_id"] = RANDOM_CLIENT_ID
+        }
+      }
+    }
+    val status = rsp.status.value
+    when (status) {
+      in (200..<300) -> {
+        val json = rsp.body<JsonNode>()
+        val thumbnailUrlJson = json["artwork_url"]
+        if (thumbnailUrlJson.isNull) {
+          throw ThumbnailNotAvailableException("The $matchedPvService video $id does not have an artwork")
+        } else {
+          val thumbnailUrl = thumbnailUrlJson.asText()
+          return ThumbnailInfo(thumbnailUrl)
+        }
+      }
+
+      else -> {
+        throw ThumbnailNotAvailableException("The $matchedPvService video $id is not available, status code: $status")
+      }
+    }
+  }
+}