Add RoomDialogPresenter.kt

app/src/main/java/chat/rocket/android/fragment/chatroom/dialog/RoomDialogPresenter.kt

+package chat.rocket.android.fragment.chatroom.dialog
+
+import android.content.Context
+import android.util.Log
+import chat.rocket.android.R
+import chat.rocket.android.helper.OkHttpHelper
+import chat.rocket.core.models.Room
+import okhttp3.*
+import java.io.IOException
+
+class RoomDialogPresenter(val context: Context, val view: RoomDialogContract.View): RoomDialogContract.Presenter {
+    override fun getDataSet(roomId: String,
+                            roomName: String,
+                            roomType: String,
+                            hostname: String,
+                            token: String,
+                            userId: String,
+                            action: Int) {
+        when (action) {
+            R.id.action_pinned_messages -> getPinnedMessages(roomType, hostname, token, userId)
+            R.id.action_favorite_messages -> getFavoriteMessages(roomType, hostname, token, userId)
+            R.id.action_file_list -> {
+                getFileList(roomId,
+                        roomType,
+                        hostname,
+                        token,
+                        userId)
+            }
+            R.id.action_member_list -> getMemberList(roomType, hostname, token, userId)
+        }
+    }
+
+    private fun getPinnedMessages(roomType: String, hostname: String, token: String, userId: String) {
+        view.showPinnedMessages()
+    }
+
+    private fun getFavoriteMessages(roomType: String, hostname: String, token: String, userId: String) {
+        view.showFavoriteMessages()
+    }
+
+    private fun getFileList(roomId: String,
+                            roomType: String,
+                            hostname: String,
+                            token: String,
+                            userId: String) {
+
+        OkHttpHelper.getClient()
+                .newCall(getRequest(roomId,
+                        roomType,
+                        hostname,
+                        token,
+                        userId))
+                .enqueue(object : Callback {
+                    override fun onFailure(call: Call, e: IOException) {
+                        Log.i("REST", "FAIL = " + e.message)
+                    }
+
+                    @Throws(IOException::class)
+                    override fun onResponse(call: Call, response: Response) {
+                        Log.i("REST", "SUCCESS = " + response.body()?.string())
+                        val res = response.body()
+                    }
+                })
+        view.showFileList()
+    }
+
+    private fun getMemberList(roomType: String, hostname: String, token: String, userId: String) {
+        view.showMemberList()
+    }
+
+    /**
+     * Returns an OkHttp3 request corresponding to the Rest API call.
+     *
+     * @param roomId The ID of the room.
+     * @param roomType The type of the room.
+     * @param hostname The server hostname.
+     * @param token The token.
+     * @param userId The user Id.
+     * @return A OkHttp3 request.
+     */
+    private fun getRequest(roomId: String,
+                           roomType: String,
+                           hostname: String,
+                           token: String,
+                           userId: String): Request {
+
+        val httpUrl = HttpUrl.Builder()
+                .scheme("http")
+                .host(getEndpointUrl(roomType, hostname))
+                .addQueryParameter("roomId", roomId)
+                .build()
+
+        return Request.Builder()
+                .url(httpUrl)
+                .get()
+                .addHeader("X-Auth-Token", token)
+                .addHeader("X-User-Id", userId)
+                .build()
+    }
+
+    /**
+     * Returns an endpoint URL (without the https or http schemas) corresponding to the Rest API call.
+     *
+     * @param roomType The type of the room.
+     * @param hostname The server hostname.
+     * @return A Rest API URL endpoint starting with www.
+     */
+    private fun getEndpointUrl(roomType: String, hostname: String): String  = "www." +
+            hostname.replace("http://", "")
+                    .replace("https://", "")
+                    .replace("www", "") +
+            getRestApiUrlForMemberList(roomType)
+
+    /**
+     * Returns the correspondent Rest API URL accordingly with the room type to get its members list.
+     *
+     * REMARK: To see all the REST API calls take a look at https://rocket.chat/docs/developer-guides/rest-api/.
+     *
+     * @param roomType The type of the room.
+     * @return A Rest API URL or null if the room type does not match.
+     */
+    private fun getRestApiUrlForMemberList(roomType: String): String? {
+        var restApiUrl: String? = null
+        when (roomType) {
+            Room.TYPE_CHANNEL -> restApiUrl = "/api/v1/channels.members"
+            Room.TYPE_PRIVATE -> restApiUrl=  "/api/v1/groups.members"
+            Room.TYPE_DIRECT_MESSAGE -> restApiUrl = "/api/v1/dm.members"
+        }
+        return restApiUrl
+    }
+
+    /**
+     * Returns the correspondent Rest API URL accordingly with the room type to get its file list.
+     *
+     * REMARK: To see all the REST API calls take a look at https://rocket.chat/docs/developer-guides/rest-api/.
+     *
+     * @param roomType The type of the room.
+     * @return A Rest API URL or null if the room type does not match.
+     */
+    private fun getRestApiUrlForFileList(roomType: String): String? {
+        var restApiUrl: String? = null
+        when (roomType) {
+            Room.TYPE_CHANNEL -> restApiUrl = "/api/v1/channels.files"
+            Room.TYPE_PRIVATE -> restApiUrl=  "/api/v1/groups.files"
+            Room.TYPE_DIRECT_MESSAGE -> restApiUrl = "/api/v1/dm.files"
+        }
+        return restApiUrl
+    }
+}
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