chore: add mobile app

frontend-admin/node_modules/expo-asset/android/build.gradle

@@ -0,0 +1,22 @@
+plugins {
+  id 'com.android.library'
+  id 'expo-module-gradle-plugin'
+}
+
+group = 'expo.modules.asset'
+version = '12.0.12'
+
+android {
+  namespace "expo.modules.asset"
+  defaultConfig {
+    versionCode 1
+    versionName "12.0.12"
+  }
+}
+
+dependencies {
+  testImplementation 'androidx.test:core:1.6.1'
+  testImplementation 'io.mockk:mockk:1.13.11'
+  testImplementation 'junit:junit:4.13.2'
+  testImplementation 'org.robolectric:robolectric:4.14.1'
+}

frontend-admin/node_modules/expo-asset/android/src/main/AndroidManifest.xml

@@ -0,0 +1,2 @@
+<manifest>
+</manifest>

frontend-admin/node_modules/expo-asset/android/src/main/java/expo/modules/asset/AssetModule.kt

@@ -0,0 +1,103 @@
+package expo.modules.asset
+
+import android.content.Context
+import android.net.Uri
+import android.util.Log
+import expo.modules.interfaces.filesystem.Permission
+import expo.modules.kotlin.AppContext
+import expo.modules.kotlin.exception.CodedException
+import expo.modules.kotlin.exception.Exceptions
+import expo.modules.kotlin.functions.Coroutine
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.io.FileInputStream
+import java.net.URI
+import java.security.DigestInputStream
+import java.security.MessageDigest
+
+internal class UnableToDownloadAssetException(url: String) :
+  CodedException("Unable to download asset from url: $url")
+
+class AssetModule : Module() {
+  private val context: Context
+    get() = appContext.reactContext ?: throw Exceptions.AppContextLost()
+
+  private fun getMD5HashOfFilePath(uri: URI): String {
+    val md = MessageDigest.getInstance("MD5")
+    return md.digest(uri.toString().toByteArray()).joinToString("") { "%02x".format(it) }
+  }
+
+  private fun getMD5HashOfFileContent(file: File): String? {
+    return try {
+      FileInputStream(file).use { inputStream ->
+        DigestInputStream(
+          inputStream,
+          MessageDigest.getInstance("MD5")
+        ).use { digestInputStream ->
+          digestInputStream.messageDigest.digest().joinToString(separator = "") { "%02x".format(it) }
+        }
+      }
+    } catch (e: Exception) {
+      e.printStackTrace()
+      null
+    }
+  }
+
+  private suspend fun downloadAsset(appContext: AppContext, uri: URI, localUrl: File): Uri {
+    if (localUrl.parentFile?.exists() != true) {
+      localUrl.mkdirs()
+    }
+
+    if (appContext.filePermission?.getPathPermissions(appContext.reactContext, localUrl.parent)?.contains(Permission.WRITE) != true) {
+      throw UnableToDownloadAssetException(uri.toString())
+    }
+
+    return withContext(appContext.backgroundCoroutineScope.coroutineContext) {
+      try {
+        val inputStream = when {
+          uri.toString().contains(":").not() -> openAssetResourceStream(context, uri.toString())
+          uri.toString().startsWith(ANDROID_EMBEDDED_URL_BASE_RESOURCE) -> openAndroidResStream(context, uri.toString())
+          else -> uri.toURL().openStream()
+        }
+        inputStream.use { input ->
+          localUrl.outputStream().use { output ->
+            val bytesCopied = input.copyTo(output)
+            if (bytesCopied == 0L) {
+              Log.w("ExpoAsset", "Asset downloaded to $localUrl is empty. It might be conflicting with another asset, or corrupted.")
+            }
+          }
+        }
+        Uri.fromFile(localUrl)
+      } catch (e: Exception) {
+        throw UnableToDownloadAssetException(uri.toString())
+      }
+    }
+  }
+
+  override fun definition() = ModuleDefinition {
+    Name("ExpoAsset")
+
+    AsyncFunction("downloadAsync") Coroutine { uri: URI, md5Hash: String?, type: String ->
+      if (uri.scheme == "file" && !uri.toString().startsWith(ANDROID_EMBEDDED_URL_BASE_RESOURCE)) {
+        return@Coroutine uri
+      }
+
+      val cacheFileId = md5Hash ?: getMD5HashOfFilePath(uri)
+      val cacheDirectory = appContext.cacheDirectory
+
+      val localUrl = File("$cacheDirectory/ExponentAsset-$cacheFileId.$type")
+
+      if (!localUrl.exists()) {
+        return@Coroutine downloadAsset(appContext, uri, localUrl)
+      }
+
+      if (md5Hash == null || md5Hash == getMD5HashOfFileContent(localUrl)) {
+        return@Coroutine Uri.fromFile(localUrl)
+      }
+
+      return@Coroutine downloadAsset(appContext, uri, localUrl)
+    }
+  }
+}

frontend-admin/node_modules/expo-asset/android/src/main/java/expo/modules/asset/ResourceAsset.kt

@@ -0,0 +1,61 @@
+package expo.modules.asset
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.content.res.Resources
+import androidx.core.net.toUri
+import expo.modules.core.errors.InvalidArgumentException
+import java.io.InputStream
+
+internal const val ANDROID_EMBEDDED_URL_BASE_RESOURCE = "file:///android_res/"
+
+/**
+ * Opens an Android resource as stream.
+ */
+internal fun openAssetResourceStream(context: Context, assetName: String): InputStream {
+  val resId = findResourceId(context, assetName) ?: throw Resources.NotFoundException(assetName)
+  return context.resources.openRawResource(resId)
+}
+
+/**
+ * Opens an Android resource as stream for `file:///android_res/` format
+ */
+internal fun openAndroidResStream(context: Context, resourceFilePath: String): InputStream {
+  val resId = findResourceIdForAndroidResPath(context, resourceFilePath)
+    ?: throw Resources.NotFoundException(resourceFilePath)
+  return context.resources.openRawResource(resId)
+}
+
+@SuppressLint("DiscouragedApi")
+private fun findResourceId(context: Context, assetName: String): Int? {
+  val resources = context.resources
+  val packageName = context.packageName
+  // react-native core and expo-assets plugin will put resource in `res/raw` or `res/drawable`
+  return resources.getIdentifier(assetName, "raw", packageName).takeIf { it != 0 }
+    ?: resources.getIdentifier(assetName, "drawable", packageName).takeIf { it != 0 }
+}
+
+@SuppressLint("DiscouragedApi")
+private fun findResourceIdForAndroidResPath(context: Context, resourceFilePath: String): Int? {
+  if (!resourceFilePath.startsWith(ANDROID_EMBEDDED_URL_BASE_RESOURCE)) {
+    throw InvalidArgumentException("Invalid resource file path: $resourceFilePath")
+  }
+  val uri = resourceFilePath.toUri()
+  val pathSegments = uri.pathSegments
+  if (pathSegments.size < 3) {
+    throw InvalidArgumentException("Invalid resource file path: $resourceFilePath")
+  }
+
+  // Strip any qualifiers after a dash, for example "drawable-xhdpi" becomes "drawable"
+  val resourceDirectory = pathSegments[1].substringBefore('-')
+
+  // Strip file extension for resource name
+  val resourceFilename = pathSegments[2]
+  val resourceName = resourceFilename.substringBeforeLast('.', resourceFilename)
+
+  return context.resources.getIdentifier(
+    resourceName,
+    resourceDirectory,
+    context.packageName
+  ).takeIf { it != 0 }
+}