feat: add imageDecode Rule

app/src/main/java/io/legado/app/data/entities/rule/ContentRule.kt

@@ -11,5 +11,6 @@ data class ContentRule(
     var sourceRegex: String? = null,
     var replaceRegex: String? = null, //替换规则
     var imageStyle: String? = null,   //默认大小居中,FULL最大宽度
+    var imageDecode: String? = null, //图片bytes二次解密js, 返回解密后的bytes
     var payAction: String? = null,    //购买操作,js或者包含{{js}}的url
 ) : Parcelable

app/src/main/java/io/legado/app/help/BookHelp.kt

@@ -136,15 +136,28 @@ object BookHelp {
         downloadImages.add(src)
         val analyzeUrl = AnalyzeUrl(src, source = bookSource)
         try {
-            analyzeUrl.getByteArrayAwait().let {
-                FileUtils.createFileIfNotExist(
+            var bytes = analyzeUrl.getByteArrayAwait()
+            //某些图片被加密，需要进一步解密
+            bookSource?.getContentRule()?.imageDecode?.let {
+                kotlin.runCatching {
+                    bookSource?.evalJS(it) {
+                        put("book", book)
+                        put("result", bytes)
+                        put("src", src)
+                    } as ByteArray
+                }.onSuccess {
+                    bytes = it
+                }.onFailure {
+                    AppLog.putDebug("${src}解密bytes错误", it)
+                }
+            }
+            FileUtils.createFileIfNotExist(
                     downloadDir,
                     cacheFolderName,
                     book.getFolderName(),
                     cacheImageFolderName,
                     "${MD5Utils.md5Encode16(src)}.${getImageSuffix(src)}"
-                ).writeBytes(it)
-            }
+            ).writeBytes(bytes)
         } catch (e: Exception) {
             AppLog.putDebug("${src}下载错误", e)
         } finally {

app/src/main/java/io/legado/app/ui/book/source/edit/BookSourceEditActivity.kt

@@ -297,6 +297,7 @@ class BookSourceEditActivity :
             add(EditEntity("sourceRegex", cr?.sourceRegex, R.string.rule_source_regex))
             add(EditEntity("replaceRegex", cr?.replaceRegex, R.string.rule_replace_regex))
             add(EditEntity("imageStyle", cr?.imageStyle, R.string.rule_image_style))
+            add(EditEntity("imageDecode", cr?.imageDecode, R.string.rule_image_decode))
             add(EditEntity("payAction", cr?.payAction, R.string.rule_pay_action))
         }
         // 段评
@@ -451,6 +452,7 @@ class BookSourceEditActivity :
                 "sourceRegex" -> contentRule.sourceRegex = it.value
                 "replaceRegex" -> contentRule.replaceRegex = it.value
                 "imageStyle" -> contentRule.imageStyle = it.value
+                "imageDecode" -> contentRule.imageDecode = it.value
                 "payAction" -> contentRule.payAction = it.value
             }
         }