TF-761 Implement compress inside download and transformer

core/lib/data/network/download/download_client.dart

@@ -1,15 +1,22 @@
 
 import 'dart:convert';
 import 'dart:io';
+import 'dart:typed_data';
 
-import 'package:core/core.dart';
+import 'package:core/data/network/dio_client.dart';
+import 'package:core/data/utils/compress_file_utils.dart';
+import 'package:core/presentation/extensions/html_extension.dart';
+import 'package:core/utils/app_logger.dart';
+import 'package:core/utils/build_utils.dart';
 import 'package:dio/dio.dart';
+import 'package:flutter/foundation.dart';
 
 class DownloadClient {
 
   final DioClient _dioClient;
+  final CompressFileUtils _compressFileUtils;
 
-  DownloadClient(this._dioClient);
+  DownloadClient(this._dioClient, this._compressFileUtils);
 
   Future<ResponseBody> downloadFile(
       String url,
@@ -28,14 +35,84 @@ class DownloadClient {
     return (responseBody as ResponseBody);
   }
 
-  Future<String?> downloadImageAsBase64(String url) async {
+  Future<String?> downloadImageAsBase64(
+      String url,
+      String cid,
+      String fileExtension,
+      String fileName,
+      {
+        Uint8List? bytesData,
+        double? maxWidth,
+        bool? compress,
+      }
+  ) async {
     try {
-      final response = await _dioClient.get(
-          url,
-          options: Options(responseType: ResponseType.bytes));
-      return base64Encode(response);
+      if (bytesData == null) {
+        log('DownloadClient::downloadImageAsBase64(): bytesData is NULL');
+        bytesData = await _dioClient.get(url, options: Options(responseType: ResponseType.bytes));
+      }
+
+      if (bytesData == null) {
+        return null;
+      }
+
+      if (BuildUtils.isWeb) {
+        final base64Uri = encodeToBase64Uri({
+          'bytesData': bytesData,
+          'mimeType': 'image/$fileExtension',
+          'cid': cid,
+          'fileName': fileName
+        });
+
+        return base64Uri;
+      } else {
+        if (compress == true) {
+          final bytesDataCompressed = await _compressFileUtils.compressBytesDataImage(
+              bytesData,
+              maxWidth: maxWidth?.toInt());
+
+          final base64Uri = await compute(encodeToBase64Uri, {
+            'bytesData': bytesDataCompressed,
+            'mimeType': 'image/$fileExtension',
+            'cid': cid,
+            'fileName': fileName
+          });
+
+          return base64Uri;
+        }  else {
+          final base64Uri = await compute(encodeToBase64Uri, {
+            'bytesData': bytesData,
+            'mimeType': 'image/$fileExtension',
+            'cid': cid,
+            'fileName': fileName
+          });
+
+          return base64Uri;
+        }
+      }
     } catch (e) {
-      return url;
+      log('DownloadClient::downloadImageAsBase64(): ERROR: $e');
+      return null;
     }
   }
+
+  static String encodeToBase64Uri(Map<String, dynamic> entryParam) {
+    var bytesData = entryParam['bytesData'];
+    var mimeType = entryParam['mimeType'];
+    final cid = entryParam['cid'];
+    var fileName = entryParam['fileName'];
+
+    final base64Data = base64Encode(bytesData);
+    if (mimeType.endsWith('svg')) {
+      mimeType = 'image/svg+xml';
+    }
+    if (!base64Data.endsWith('==')) {
+      base64Data.append('==');
+    }
+    if (fileName.contains('.')) {
+      fileName = fileName.split('.').first;
+    }
+    final base64Uri = '<img src="data:$mimeType;base64,$base64Data" alt="$fileName" id="$cid" style="max-width: 100%" />';
+    return base64Uri;
+  }
 }

core/lib/presentation/utils/html_transformer/dom/image_transformers.dart

@@ -4,6 +4,7 @@ import 'dart:convert';
 import 'package:core/core.dart';
 import 'package:core/presentation/utils/html_transformer/base/dom_transformer.dart';
 import 'package:dio/dio.dart';
+import 'package:flutter/foundation.dart';
 import 'package:html/dom.dart';
 
 class ImageTransformer extends DomTransformer {
@@ -19,6 +20,7 @@ class ImageTransformer extends DomTransformer {
         DioClient? dioClient
       }
   ) async {
+    final compressFileUtils = CompressFileUtils();
     final imageElements = document.getElementsByTagName('img');
 
     await Future.wait(imageElements.map((imageElement) async {
@@ -32,24 +34,50 @@ class ImageTransformer extends DomTransformer {
         final cid = src.replaceFirst('cid:', '').trim();
         final cidUrlDownload = mapUrlDownloadCID[cid];
         if (cidUrlDownload != null && cidUrlDownload.isNotEmpty && dioClient != null) {
-          final imgBase64 = await loadAsyncNetworkImageToBase64(dioClient, cidUrlDownload);
-          if (imgBase64 != null && imgBase64.isNotEmpty) {
-            imageElement.attributes['src'] = 'data:image/jpeg;base64,$imgBase64';
+          final imgBase64Uri = await loadAsyncNetworkImageToBase64(
+              dioClient,
+              compressFileUtils,
+              cidUrlDownload);
+          if (imgBase64Uri.isNotEmpty) {
+            imageElement.attributes['src'] = imgBase64Uri;
           }
         }
       }
     }));
   }
 
-
-  Future<String?> loadAsyncNetworkImageToBase64(DioClient dioClient, String imageUrl) async {
+  Future<String> loadAsyncNetworkImageToBase64(
+      DioClient dioClient,
+      CompressFileUtils compressFileUtils,
+      String imageUrl
+  ) async {
     try {
-      final response = await dioClient.get(
-        imageUrl,
-        options: Options(responseType: ResponseType.bytes));
-      return base64Encode(response);
+      var responseData = await dioClient.get(
+          imageUrl,
+          options: Options(responseType: ResponseType.bytes));
+
+      if (responseData != null) {
+        if (BuildUtils.isWeb) {
+          return encodeToBase64Uri(responseData);
+        } else {
+          final bytesCompressed = await compressFileUtils.compressBytesDataImage(responseData);
+          final base64Uri = await compute(encodeToBase64Uri, bytesCompressed);
+          return base64Uri;
+        }
+      } else {
+        return '';
+      }
     } catch (e) {
-      return imageUrl;
+      return '';
     }
   }
+
+  static String encodeToBase64Uri(dynamic bytesData) {
+    final base64Data = base64Encode(bytesData);
+    if (!base64Data.endsWith('==')) {
+      base64Data.append('==');
+    }
+    final base64Uri = 'data:image/jpeg;base64,$base64Data';
+    return base64Uri;
+  }
 }