1 files changed, 135 insertions, 0 deletions
diff --git a/jvm/src/main/scala/xyz/driver/core/file/GcsStorage.scala b/jvm/src/main/scala/xyz/driver/core/file/GcsStorage.scala
new file mode 100644
index 0000000..5c94645
--- /dev/null
+++ b/jvm/src/main/scala/xyz/driver/core/file/GcsStorage.scala
@@ -0,0 +1,135 @@
+package xyz.driver.core.file
+
+import akka.NotUsed
+import akka.stream.scaladsl.Source
+import akka.util.ByteString
+import com.google.cloud.ReadChannel
+import java.io.{BufferedOutputStream, File, FileInputStream, FileOutputStream}
+import java.net.URL
+import java.nio.ByteBuffer
+import java.nio.file.{Path, Paths}
+import java.util.concurrent.TimeUnit
+
+import com.google.cloud.storage.Storage.BlobListOption
+import com.google.cloud.storage.{Option => _, _}
+import xyz.driver.core.time.Time
+import xyz.driver.core.{Name, Revision, generators}
+
+import scala.collection.JavaConverters._
+import scala.concurrent.duration.Duration
+import scala.concurrent.{ExecutionContext, Future}
+import scalaz.{ListT, OptionT}
+
+@deprecated("Consider using xyz.driver.core.storage.GcsBlobStorage instead", "driver-core 1.8.14")
+class GcsStorage(
+    storageClient: Storage,
+    bucketName: Name[Bucket],
+    executionContext: ExecutionContext,
+    chunkSize: Int = 4096)
+    extends SignedFileStorage {
+  implicit private val execution: ExecutionContext = executionContext
+
+  override def upload(localSource: File, destination: Path): Future[Unit] = Future {
+    checkSafeFileName(destination) {
+      val blobId = BlobId.of(bucketName.value, destination.toString)
+      def acl    = Bucket.BlobWriteOption.predefinedAcl(Storage.PredefinedAcl.PUBLIC_READ)
+
+      storageClient.get(bucketName.value).create(blobId.getName, new FileInputStream(localSource), acl)
+    }
+  }
+
+  override def download(filePath: Path): OptionT[Future, File] = {
+    OptionT.optionT(Future {
+      Option(storageClient.get(bucketName.value, filePath.toString)).filterNot(_.getSize == 0).map {
+        blob =>
+          val tempDir             = System.getProperty("java.io.tmpdir")
+          val randomFolderName    = generators.nextUuid().toString
+          val tempDestinationFile = new File(Paths.get(tempDir, randomFolderName, filePath.toString).toString)
+
+          if (!tempDestinationFile.getParentFile.mkdirs()) {
+            throw new Exception(s"Failed to create temp directory to download file `$tempDestinationFile`")
+          } else {
+            val target = new BufferedOutputStream(new FileOutputStream(tempDestinationFile))
+            try target.write(blob.getContent())
+            finally target.close()
+            tempDestinationFile
+          }
+      }
+    })
+  }
+
+  override def stream(filePath: Path): OptionT[Future, Source[ByteString, NotUsed]] =
+    OptionT.optionT(Future {
+      def readChunk(rc: ReadChannel): Option[ByteString] = {
+        val buffer = ByteBuffer.allocate(chunkSize)
+        val length = rc.read(buffer)
+        if (length > 0) {
+          buffer.flip()
+          Some(ByteString.fromByteBuffer(buffer))
+        } else {
+          None
+        }
+      }
+
+      Option(storageClient.get(bucketName.value, filePath.toString)).map { blob =>
+        Source.unfoldResource[ByteString, ReadChannel](
+          create = () => blob.reader(),
+          read = channel => readChunk(channel),
+          close = channel => channel.close()
+        )
+      }
+    })
+
+  override def delete(filePath: Path): Future[Unit] = Future {
+    storageClient.delete(BlobId.of(bucketName.value, filePath.toString))
+  }
+
+  override def list(directoryPath: Path): ListT[Future, FileLink] =
+    ListT.listT(Future {
+      val directory = s"$directoryPath/"
+      val page = storageClient.list(
+        bucketName.value,
+        BlobListOption.currentDirectory(),
+        BlobListOption.prefix(directory)
+      )
+
+      page
+        .iterateAll()
+        .asScala
+        .filter(_.getName != directory)
+        .map(blobToFileLink(directoryPath, _))
+        .toList
+    })
+
+  protected def blobToFileLink(path: Path, blob: Blob): FileLink = {
+    def nullError(property: String) = throw new IllegalStateException(s"Blob $blob at $path does not have $property")
+    val name                        = Option(blob.getName).getOrElse(nullError("a name"))
+    val generation                  = Option(blob.getGeneration).getOrElse(nullError("a generation"))
+    val updateTime                  = Option(blob.getUpdateTime).getOrElse(nullError("an update time"))
+    val size                        = Option(blob.getSize).getOrElse(nullError("a size"))
+
+    FileLink(
+      Name(name.split('/').last),
+      Paths.get(name),
+      Revision(generation.toString),
+      Time(updateTime),
+      size
+    )
+  }
+
+  override def exists(path: Path): Future[Boolean] = Future {
+    val blob = Option(
+      storageClient.get(
+        bucketName.value,
+        path.toString
+      ))
+    blob.isDefined
+  }
+
+  override def signedFileUrl(filePath: Path, duration: Duration): OptionT[Future, URL] =
+    OptionT.optionT(Future {
+      Option(storageClient.get(bucketName.value, filePath.toString)).filterNot(_.getSize == 0).map { blob =>
+        blob.signUrl(duration.toSeconds, TimeUnit.SECONDS)
+      }
+    })
+}