Added a Data Provider to manage images

spra-play-server/src/main/resources/application.conf

@@ -30,6 +30,16 @@ dataExplorer {
       }
       referenceDisplayField = "email"
     }
+
+    images {
+      tableName = "images"
+      primaryKeyField = "image_id"
+      nonEditableColumns = ["image_id", "created_at"]
+      canBeDeleted = false
+      createFilter {
+        requiredColumns = ["name", "data"]
+      }
+    }
   }
 }
 

spra-web/src/main/scala/net/wiringbits/spra/ui/web/AdminView.scala

@@ -3,13 +3,12 @@ package net.wiringbits.spra.ui.web
 import net.wiringbits.spra.api.models.AdminGetTables
 import net.wiringbits.spra.ui.web.components.{CreateGuesser, EditGuesser, ListGuesser}
 import net.wiringbits.spra.ui.web.facades.reactadmin.{Admin, Resource}
-import net.wiringbits.spra.ui.web.facades.simpleRestProvider
+import net.wiringbits.spra.ui.web.facades.createDataProvider
 import net.wiringbits.spra.ui.web.models.DataExplorerSettings
 import org.scalajs.macrotaskexecutor.MacrotaskExecutor.Implicits.global
 import slinky.core.facade.{Hooks, ReactElement}
 import slinky.core.{FunctionalComponent, KeyAddingStage}
 import slinky.web.html.{div, h1}
-
 import scala.util.{Failure, Success}
 
 object AdminView {
@@ -52,7 +51,7 @@ object AdminView {
     }
 
     div()(
-      Admin(simpleRestProvider(tablesUrl))(buildResources),
+      Admin(createDataProvider(tablesUrl))(buildResources),
       error.map(h1(_))
     )
   }

spra-web/src/main/scala/net/wiringbits/spra/ui/web/facades/DataProvider.scala

@@ -1,6 +1,19 @@
 package net.wiringbits.spra.ui.web.facades
 
 import scala.scalajs.js
+import scala.scalajs.js.annotation.JSImport
 
 @js.native
 trait DataProvider extends js.Object
+
+@js.native
+@JSImport("ra-data-simple-rest", JSImport.Default)
+// https://www.npmjs.com/package/ra-data-simple-rest
+def simpleRestProvider(url: String): DataProvider = js.native
+
+@js.native
+@JSImport("react-admin", "withLifecycleCallbacks")
+// https://marmelab.com/react-admin/withLifecycleCallbacks.html
+object WithLifecycleCallbacks extends js.Object {
+  def apply(dataProvider: DataProvider, callbacks: js.Array[js.Object]): DataProvider = js.native
+}

spra-web/src/main/scala/net/wiringbits/spra/ui/web/facades/package.scala

@@ -1,10 +1,32 @@
 package net.wiringbits.spra.ui.web
 
 import scala.scalajs.js
-import scala.scalajs.js.annotation.JSImport
+import net.wiringbits.spra.ui.web.utils.Images.*
+import org.scalajs.dom.File
 
 package object facades {
-  @js.native
-  @JSImport("ra-data-simple-rest", JSImport.Default)
-  def simpleRestProvider(url: String): DataProvider = js.native
+  def createDataProvider(url: String): DataProvider = {
+    val baseDataProvider = simpleRestProvider(url)
+    WithLifecycleCallbacks(
+      baseDataProvider,
+      js.Array(
+        js.Dynamic.literal(
+          resource = "images",
+          afterRead = (record: js.Dynamic, dataProvider: js.Any) => {
+            val hexImage = record.data.asInstanceOf[String]
+            val urlImage = convertHexToImage(hexImage)
+            record.updateDynamic("data")(urlImage)
+            record
+          },
+          beforeSave = (data: js.Dynamic, dataProvider: js.Any) => {
+            val rawFile = data.data.rawFile.asInstanceOf[File]
+            convertImageToByteArray(rawFile).`then` { value =>
+              data.updateDynamic("data")(value.asInstanceOf[js.Any])
+              data
+            }
+          }
+        )
+      )
+    )
+  }
 }

spra-web/src/main/scala/net/wiringbits/spra/ui/web/utils/Images.scala

@@ -0,0 +1,41 @@
+package net.wiringbits.spra.ui.web.utils
+
+import org.scalajs.dom
+import org.scalajs.dom.{Blob, File}
+import scala.util.{Failure, Success, Try}
+import scala.scalajs.js.Promise
+import scala.scalajs.js.typedarray.{ArrayBuffer, Int8Array, Uint8Array}
+import scala.scalajs.js
+
+object Images {
+  def convertImageToByteArray(image: dom.File): js.Promise[String] = {
+    new js.Promise[String]((resolve, reject) => {
+      val reader = new dom.FileReader()
+      reader.onload = { (e: dom.Event) =>
+        val arrayBuffer = reader.result.asInstanceOf[ArrayBuffer]
+        val byteArray = new Int8Array(arrayBuffer).toArray
+        resolve(byteArray.mkString("[", ", ", "]"))
+      }
+      reader.onerror = { (e: dom.Event) =>
+        reject(new js.Error("Failed to read file"))
+      }
+      reader.readAsArrayBuffer(image)
+    })
+  }
+
+  def convertHexToImage(imageHex: String): String = {
+    // Check if the argument is a hexadecimal string"
+    if (!imageHex.startsWith("\\x") || (imageHex.length % 2) == 1) {
+      throw new IllegalArgumentException(s"Error: Expected a hexadecimal string but found: $imageHex")
+    }
+    // Remove the "\x" prefix from the hex string, as it's not part of the actual image data
+    val hex = imageHex.tail.tail
+    val imageBinary: Array[Byte] =
+      Try(hex.grouped(2).map { hex => Integer.parseInt(hex, 16).toByte }.toArray) match {
+        case Success(value) => value
+        case Failure(_) => Array.empty
+      }
+    val byteArray = Uint8Array(js.Array(imageBinary.map(_.toShort): _*))
+    dom.URL.createObjectURL(dom.Blob(js.Array(byteArray.buffer)))
+  }
+}