Account for custom delegated image requests, fixes Hitomi pages

app/src/main/java/exh/source/DelegatedHttpSource.kt

@@ -99,6 +99,12 @@ abstract class DelegatedHttpSource(val delegate: HttpSource) : HttpSource() {
      */
     override val baseUrl get() = delegate.baseUrl
 
+    /**
+     * Version id used to generate the source id. If the site completely changes and urls are
+     * incompatible, you may increase this value and it'll be considered as a new source.
+     */
+    override val versionId get() = delegate.versionId
+
     /**
      * Whether the source has support for latest updates.
      */
@@ -221,6 +227,16 @@ abstract class DelegatedHttpSource(val delegate: HttpSource) : HttpSource() {
         return delegate.fetchImageUrl(page)
     }
 
+    /**
+     * Returns an observable with the response of the source image.
+     *
+     * @param page the page whose source image has to be downloaded.
+     */
+    override fun fetchImage(page: Page): Observable<Response> {
+        ensureDelegateCompatible()
+        return delegate.fetchImage(page)
+    }
+
     /**
      * Called before inserting a new chapter into database. Use it if you need to override chapter
      * fields, like the title or the chapter number. Do not change anything to [manga].

app/src/main/java/exh/source/EnhancedHttpSource.kt

@@ -200,6 +200,13 @@ class EnhancedHttpSource(
      */
     override fun fetchImageUrl(page: Page) = source().fetchImageUrl(page)
 
+    /**
+     * Returns an observable with the response of the source image.
+     *
+     * @param page the page whose source image has to be downloaded.
+     */
+    override fun fetchImage(page: Page) = source().fetchImage(page)
+
     /**
      * Called before inserting a new chapter into database. Use it if you need to override chapter
      * fields, like the title or the chapter number. Do not change anything to [manga].