[Madara] Decrypt image list for Amuy and Cerise Scans (#14876)

* madata: add chapter image list decryption

* add final newline

* Exit early if there's no chapter protection

Co-authored-by: AntsyLich <59261191+AntsyLich@users.noreply.github.com>

* Change approach to individual sources

multisrc doesn't like external dependencies

* unbump baseversioncode

Co-authored-by: AntsyLich <59261191+AntsyLich@users.noreply.github.com>

multisrc/overrides/madara/amuy/additional.gradle

@@ -0,0 +1,3 @@
+dependencies {
+    implementation(project(':lib-cryptoaes'))
+}

multisrc/overrides/madara/amuy/src/Amuy.kt

@@ -1,8 +1,15 @@
 package eu.kanade.tachiyomi.extension.pt.amuy
 
+import android.util.Base64
+import eu.kanade.tachiyomi.lib.cryptoaes.CryptoAES
 import eu.kanade.tachiyomi.multisrc.madara.Madara
 import eu.kanade.tachiyomi.network.interceptor.rateLimit
+import eu.kanade.tachiyomi.source.model.Page
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.OkHttpClient
+import org.jsoup.nodes.Document
 import java.text.SimpleDateFormat
 import java.util.Locale
 import java.util.concurrent.TimeUnit
@@ -19,4 +26,44 @@ class Amuy : Madara(
         .build()
 
     override val useNewChapterEndpoint = true
+
+    override fun pageListParse(document: Document): List<Page> {
+        val chapterProtector = document.getElementById("chapter-protector-data")?.html()
+            ?: return super.pageListParse(document)
+
+        val password = chapterProtector
+            .substringAfter("wpmangaprotectornonce='")
+            .substringBefore("';")
+        val chapterData = json.parseToJsonElement(
+            chapterProtector
+                .substringAfter("chapter_data='")
+                .substringBefore("';")
+                .replace("\\/", "/")
+        ).jsonObject
+
+        val unsaltedCiphertext = Base64.decode(chapterData["ct"]!!.jsonPrimitive.content, Base64.DEFAULT)
+        val salt = chapterData["s"]!!.jsonPrimitive.content.decodeHex()
+        val ciphertext = SALTED + salt + unsaltedCiphertext
+
+        val rawImgArray = CryptoAES.decrypt(Base64.encodeToString(ciphertext, Base64.DEFAULT), password)
+        val imgArrayString = json.parseToJsonElement(rawImgArray).jsonPrimitive.content
+        val imgArray = json.parseToJsonElement(imgArrayString).jsonArray
+
+        return imgArray.mapIndexed { idx, it ->
+            Page(idx, document.location(), it.jsonPrimitive.content)
+        }
+    }
+
+    // https://stackoverflow.com/a/66614516
+    private fun String.decodeHex(): ByteArray {
+        check(length % 2 == 0) { "Must have an even length" }
+
+        return chunked(2)
+            .map { it.toInt(16).toByte() }
+            .toByteArray()
+    }
+
+    companion object {
+        val SALTED = "Salted__".toByteArray(Charsets.UTF_8)
+    }
 }

multisrc/overrides/madara/cerisescans/additional.gradle

@@ -0,0 +1,3 @@
+dependencies {
+    implementation(project(':lib-cryptoaes'))
+}

multisrc/overrides/madara/cerisescans/src/CeriseScans.kt

@@ -1,8 +1,15 @@
 package eu.kanade.tachiyomi.extension.pt.cerisescans
 
+import android.util.Base64
+import eu.kanade.tachiyomi.lib.cryptoaes.CryptoAES
 import eu.kanade.tachiyomi.multisrc.madara.Madara
 import eu.kanade.tachiyomi.network.interceptor.rateLimit
+import eu.kanade.tachiyomi.source.model.Page
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import okhttp3.OkHttpClient
+import org.jsoup.nodes.Document
 import java.text.SimpleDateFormat
 import java.util.Locale
 import java.util.concurrent.TimeUnit
@@ -19,4 +26,44 @@ class CeriseScans : Madara(
         .build()
 
     override val useNewChapterEndpoint = true
+
+    override fun pageListParse(document: Document): List<Page> {
+        val chapterProtector = document.getElementById("chapter-protector-data")?.html()
+            ?: return super.pageListParse(document)
+
+        val password = chapterProtector
+            .substringAfter("wpmangaprotectornonce='")
+            .substringBefore("';")
+        val chapterData = json.parseToJsonElement(
+            chapterProtector
+                .substringAfter("chapter_data='")
+                .substringBefore("';")
+                .replace("\\/", "/")
+        ).jsonObject
+
+        val unsaltedCiphertext = Base64.decode(chapterData["ct"]!!.jsonPrimitive.content, Base64.DEFAULT)
+        val salt = chapterData["s"]!!.jsonPrimitive.content.decodeHex()
+        val ciphertext = SALTED + salt + unsaltedCiphertext
+
+        val rawImgArray = CryptoAES.decrypt(Base64.encodeToString(ciphertext, Base64.DEFAULT), password)
+        val imgArrayString = json.parseToJsonElement(rawImgArray).jsonPrimitive.content
+        val imgArray = json.parseToJsonElement(imgArrayString).jsonArray
+
+        return imgArray.mapIndexed { idx, it ->
+            Page(idx, document.location(), it.jsonPrimitive.content)
+        }
+    }
+
+    // https://stackoverflow.com/a/66614516
+    private fun String.decodeHex(): ByteArray {
+        check(length % 2 == 0) { "Must have an even length" }
+
+        return chunked(2)
+            .map { it.toInt(16).toByte() }
+            .toByteArray()
+    }
+
+    companion object {
+        val SALTED = "Salted__".toByteArray(Charsets.UTF_8)
+    }
 }

multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/madara/Madara.kt

@@ -358,6 +358,7 @@ abstract class Madara(
                             if (list.isNotEmpty()) { list.forEach { genre -> url.addQueryParameter("genre[]", genre.id) } }
                         }
                 }
+                else -> {}
             }
         }
         return GET(url.toString(), headers)
@@ -488,6 +489,7 @@ abstract class Madara(
                             taxQueryIdx++
                         }
                     }
+                    else -> {}
                 }
             }
         }
@@ -816,7 +818,7 @@ abstract class Madara(
     }
     open val updatingRegex = "Updating|Atualizando".toRegex(RegexOption.IGNORE_CASE)
 
-    public fun String.notUpdating(): Boolean {
+    fun String.notUpdating(): Boolean {
         return this.contains(updatingRegex).not()
     }
 

multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/madara/MadaraGenerator.kt

@@ -35,7 +35,7 @@ class MadaraGenerator : ThemeSourceGenerator {
         SingleLang("Aleatória Scan", "https://aleatoriascan.xyz", "pt-BR", className = "AleatoriaScan"),
         SingleLang("AllPornComic", "https://allporncomic.com", "en", isNsfw = true),
         SingleLang("Aln Scans", "https://alnscans.com", "en"),
-        SingleLang("Amuy", "https://amuyscans.com", "pt-BR", isNsfw = true),
+        SingleLang("Amuy", "https://amuyscans.com", "pt-BR", isNsfw = true, overrideVersionCode = 1),
         SingleLang("Anikiga", "https://anikiga.com", "tr"),
         SingleLang("Anisa Manga", "https://anisamanga.com", "tr"),
         SingleLang("Ansh Scans", "https://anshscans.org", "en"),
@@ -64,7 +64,7 @@ class MadaraGenerator : ThemeSourceGenerator {
         SingleLang("CAT-translator", "https://cats-translator.com/manga", "th", className = "CatTranslator", overrideVersionCode = 2),
         SingleLang("Cat300", "https://cat300.com", "th", isNsfw = true, className = "Cat300", overrideVersionCode = 1),
         SingleLang("CatOnHeadTranslations", "https://catonhead.com", "en", overrideVersionCode = 2),
-        SingleLang("Cerise Scans", "https://cerisescan.com", "pt-BR", overrideVersionCode = 3),
+        SingleLang("Cerise Scans", "https://cerisescan.com", "pt-BR", overrideVersionCode = 4),
         SingleLang("Chibi Manga", "https://www.cmreader.info", "en", overrideVersionCode = 1),
         SingleLang("Clover Manga", "https://clover-manga.com", "tr", overrideVersionCode = 2),
         SingleLang("Coffee Manga", "https://coffeemanga.io", "en", overrideVersionCode = 1),