watchdog-be: CORSをせっていできるように

watch-dog-be/build.gradle.kts

@@ -36,6 +36,7 @@ dependencies {
     implementation("io.ktor:ktor-server-content-negotiation-jvm")
     implementation("io.ktor:ktor-serialization-kotlinx-json-jvm")
     implementation("io.ktor:ktor-server-netty-jvm")
+    implementation("io.ktor:ktor-server-cors")
     implementation("ch.qos.logback:logback-classic:1.5.3")
 }
 

watch-dog-be/src/main/kotlin/dev/usbharu/unos/watchdog/be/Main.kt

@@ -6,19 +6,33 @@ import com.mongodb.kotlin.client.coroutine.MongoClient
 import com.mongodb.kotlin.client.coroutine.MongoDatabase
 import dev.usbharu.unos.watchdog.be.domain.MongoMetricsRepository
 import io.grpc.ServerBuilder
+import io.ktor.http.*
 import io.ktor.serialization.kotlinx.json.*
 import io.ktor.server.application.*
 import io.ktor.server.plugins.contentnegotiation.*
+import io.ktor.server.plugins.cors.routing.*
 import io.ktor.server.routing.*
+import java.net.URI
 
 fun main(args: Array<String>) {
     io.ktor.server.netty.EngineMain.main(args)
 }
 
 fun Application.module() {
+    val frontEndUrl = URI(environment.config.property("watchdog.front-url").getString())
     install(ContentNegotiation) {
         json()
     }
+    install(CORS){
+        allowMethod(HttpMethod.Get)
+        allowMethod(HttpMethod.Post)
+        allowMethod(HttpMethod.Put)
+        allowMethod(HttpMethod.Delete)
+        allowMethod(HttpMethod.Options)
+        allowHost(frontEndUrl.authority, schemes = listOf(frontEndUrl.scheme))
+        allowCredentials = true
+        allowNonSimpleContentTypes = true
+    }
 
     val url = environment.config.property("watchdog.db.url").getString()
     val databaseName = environment.config.property("watchdog.db.database").getString()