feature: Use cache for images from network

Author: retyui

android/src/main/java/com/reactnativecommunity/imageeditor/ImageEditorModuleImpl.kt

@@ -333,13 +333,7 @@ class ImageEditorModuleImpl(private val reactContext: ReactApplicationContext) {
         } else if (isLocalUri(uri)) {
             reactContext.contentResolver.openInputStream(Uri.parse(uri))
         } else {
-            val connection = URL(uri).openConnection()
-            headers?.forEach { (key, value) ->
-                if (value is String) {
-                    connection.setRequestProperty(key, value)
-                }
-            }
-            connection.getInputStream()
+            fetchOrUseCache(uri, headers, reactContext)
         }
     }
 
@@ -450,6 +444,34 @@ class ImageEditorModuleImpl(private val reactContext: ReactApplicationContext) {
             )
 
         // Utils
+        private fun fetchOrUseCache(
+            uri: String,
+            headers: HashMap<String, Any?>?,
+            context: Context
+        ): InputStream? {
+            val filename = getFileNameFromUrl(uri, headers)
+            val cacheDir = getCacheDir(context)
+            val cachedFile = File(cacheDir, filename)
+            if (!cachedFile.exists()) {
+                val connection = URL(uri).openConnection()
+                headers?.forEach { (key, value) ->
+                    if (value is String) {
+                        connection.setRequestProperty(key, value)
+                    }
+                }
+                val inputStream = connection.getInputStream()
+                FileOutputStream(cachedFile).use { outputStream ->
+                    inputStream.copyTo(outputStream)
+                }
+            }
+
+            return FileInputStream(cachedFile)
+        }
+
+        private fun getFileNameFromUrl(uri: String, headers: HashMap<String, Any?>?): String {
+            return "$uri${headers?.hashCode() ?: 0}".hashCode().toString()
+        }
+
         private fun getResultMap(
             resizedImage: File,
             image: Bitmap,
@@ -593,14 +615,8 @@ class ImageEditorModuleImpl(private val reactContext: ReactApplicationContext) {
             }
         }
 
-        /**
-         * Create a temporary file in the cache directory on either internal or external storage,
-         * whichever is available and has more free space.
-         *
-         * @param mimeType the MIME type of the file to create (image/ *)
-         */
         @Throws(IOException::class)
-        private fun createTempFile(context: Context, mimeType: String?): File {
+        private fun getCacheDir(context: Context): File? {
             val externalCacheDir = context.externalCacheDir
             val internalCacheDir = context.cacheDir
             if (externalCacheDir == null && internalCacheDir == null) {
@@ -615,10 +631,21 @@ class ImageEditorModuleImpl(private val reactContext: ReactApplicationContext) {
                     if (externalCacheDir.freeSpace > internalCacheDir.freeSpace) externalCacheDir
                     else internalCacheDir
                 }
+            return cacheDir
+        }
+
+        /**
+         * Create a temporary file in the cache directory on either internal or external storage,
+         * whichever is available and has more free space.
+         *
+         * @param mimeType the MIME type of the file to create (image/ *)
+         */
+        @Throws(IOException::class)
+        private fun createTempFile(context: Context, mimeType: String?): File {
             return File.createTempFile(
                 TEMP_FILE_PREFIX,
                 getFileExtensionForType(mimeType),
-                cacheDir
+                getCacheDir(context)
             )
         }