feat: initial api support

shared/src/commonMain/kotlin/moe/lava/banksia/Constants.kt

@@ -1,3 +0,0 @@
-package moe.lava.banksia
-
-const val SERVER_PORT = 8080

shared/src/commonMain/kotlin/moe/lava/banksia/Constants.kt.skeleton

@@ -0,0 +1,6 @@
+package moe.lava.banksia
+
+object Constants {
+    const val devid: String = ""
+    const val key: String = ""
+}

shared/src/commonMain/kotlin/moe/lava/banksia/Greeting.kt

@@ -1,9 +0,0 @@
-package moe.lava.banksia
-
-class Greeting {
-    private val platform = getPlatform()
-
-    fun greet(): String {
-        return "Hello, ${platform.name}!"
-    }
-}

shared/src/commonMain/kotlin/moe/lava/banksia/Logging.kt

@@ -0,0 +1,3 @@
+package moe.lava.banksia
+
+expect fun log(tag: String, msg: String)

shared/src/commonMain/kotlin/moe/lava/banksia/Platform.kt

@@ -1,7 +0,0 @@
-package moe.lava.banksia
-
-interface Platform {
-    val name: String
-}
-
-expect fun getPlatform(): Platform

shared/src/commonMain/kotlin/moe/lava/banksia/api/ptv/PtvService.kt

@@ -0,0 +1,58 @@
+package moe.lava.banksia.api.ptv
+
+import io.ktor.client.HttpClient
+import io.ktor.client.call.body
+import io.ktor.client.plugins.HttpSend
+import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.client.plugins.defaultRequest
+import io.ktor.client.plugins.plugin
+import io.ktor.client.request.get
+import io.ktor.client.request.parameter
+import io.ktor.http.encodedPath
+import io.ktor.serialization.kotlinx.json.json
+import kotlinx.io.bytestring.encodeToByteString
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import moe.lava.banksia.Constants
+import moe.lava.banksia.log
+import okio.ByteString.Companion.encodeUtf8
+
+@Serializable
+data class Route(
+    @SerialName("route_id") val routeId: Int,
+    @SerialName("route_number") val routeNumber: String,
+    @SerialName("route_name") val routeName: String,
+)
+
+@Serializable
+data class RouteResponse(val routes: List<Route>)
+
+class PtvService {
+    private val client = HttpClient() {
+        install(ContentNegotiation) {
+            json(Json {
+                ignoreUnknownKeys = true
+            })
+        }
+        defaultRequest {
+            url("https://timetableapi.ptv.vic.gov.au/v3/")
+        }
+    }
+
+    constructor() {
+        client.plugin(HttpSend).intercept { req ->
+            req.parameter("devid", Constants.devid)
+            val fullPath = req.url.build().encodedPathAndQuery
+            val hash = fullPath.encodeUtf8().hmacSha1(Constants.key.encodeUtf8()).hex()
+            req.parameter("signature", hash)
+            log("ktor.intercept", req.url.build().encodedPathAndQuery)
+            execute(req)
+        }
+    }
+
+    suspend fun routes(): List<Route> {
+        val response: RouteResponse = client.get("routes").body()
+        return response.routes
+    }
+}