Add filesEndpoint to Uploader interface

src/main/kotlin/de/cyface/uploader/DefaultUploader.kt

@@ -66,7 +66,7 @@ import javax.net.ssl.SSLException
  * To use this interface just call [DefaultUploader.upload] with an authentication token.
  *
  * @author Armin Schnabel
- * @version 1.0.0
+ * @version 1.1.0
  * @since 1.0.0
  * @property apiEndpoint An API endpoint running a Cyface data collector service, like `https://some.url/api/v3`
  */
@@ -201,6 +201,10 @@ class DefaultUploader(private val apiEndpoint: String) : Uploader {
         return URL(returnUrlWithTrailingSlash(apiEndpoint) + "measurements")
     }
 
+    override fun filesEndpoint(measurementId: Long): URL {
+        return URL(returnUrlWithTrailingSlash(apiEndpoint) + "measurements/$measurementId/files")
+    }
+
     @Throws(
         BadRequestException::class,
         UnauthorizedException::class,

src/main/kotlin/de/cyface/uploader/Uploader.kt

@@ -28,7 +28,7 @@ import java.net.URL
  * Interface for uploading files to a Cyface Data Collector.
  *
  * @author Armin Schnabel
- * @version 1.0.0
+ * @version 1.1.0
  * @since 1.0.0
  */
 interface Uploader {
@@ -54,9 +54,17 @@ interface Uploader {
     ): Result
 
     /**
-     * @return the endpoint which will be used for the upload.
+     * @return the endpoint which will be used to upload the core measurement file.
      * @throws MalformedURLException if the endpoint address provided is malformed.
      */
     @Throws(MalformedURLException::class)
     fun endpoint(): URL
+
+    /**
+     * @param measurementId The id of the measurement the files are captured for.
+     * @return the endpoint which will be used to upload the attached files of a measurement.
+     * @throws MalformedURLException if the endpoint address provided is malformed.
+     */
+    @Throws(MalformedURLException::class)
+    fun filesEndpoint(measurementId: Long): URL
 }