Mangakimi: Fix images (#8316)

fix descramble image

src/th/mangakimi/build.gradle

@@ -3,8 +3,12 @@ ext {
     extClass = '.MangaKimi'
     themePkg = 'mangathemesia'
     baseUrl = 'https://www.mangakimi.com'
-    overrideVersionCode = 0
+    overrideVersionCode = 1
     isNsfw = true
 }
 
 apply from: "$rootDir/common.gradle"
+
+dependencies {
+    implementation(project(':lib:unpacker'))
+}

src/th/mangakimi/src/eu/kanade/tachiyomi/extension/th/mangakimi/MangaKimi.kt

@@ -1,6 +1,21 @@
 package eu.kanade.tachiyomi.extension.th.mangakimi
 
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.graphics.Canvas
+import android.graphics.Rect
+import eu.kanade.tachiyomi.lib.unpacker.Unpacker
 import eu.kanade.tachiyomi.multisrc.mangathemesia.MangaThemesia
+import eu.kanade.tachiyomi.source.model.Page
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import okhttp3.Interceptor
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.Response
+import okhttp3.ResponseBody.Companion.toResponseBody
+import org.jsoup.nodes.Document
+import java.io.ByteArrayOutputStream
 import java.text.SimpleDateFormat
 import java.util.Locale
 import java.util.TimeZone
@@ -12,4 +27,91 @@ class MangaKimi : MangaThemesia(
     dateFormat = SimpleDateFormat("MMMM d, yyyy", Locale("th")).apply {
         timeZone = TimeZone.getTimeZone("Asia/Bangkok")
     },
-)
+) {
+
+    override val client = super.client.newBuilder()
+        .addNetworkInterceptor(::imageDescrambler)
+        .build()
+
+    // Pages
+    override val pageSelector = "div#readerarea img, #readerarea div.displayImage + script:containsData(p,a,c,k,e,d)"
+
+    override fun pageListParse(document: Document): List<Page> {
+        countViews(document)
+
+        val location = document.location()
+        return document.select(pageSelector).mapIndexed { i, img ->
+            if (img.tagName() == "img") {
+                Page(i, location, img.imgAttr())
+            } else {
+                val unpackedScript = Unpacker.unpack(img.data())
+                val blockWidth = blockWidthRegex.find(unpackedScript)!!.groupValues[1].toInt()
+                val blockHeight = blockHeightRegex.find(unpackedScript)!!.groupValues[1].toInt()
+                val matrix = unpackedScript.substringAfter("[")
+                    .substringBefore("];")
+                    .let { "[$it]" }
+                val scrambledImageUrl = unpackedScript.substringAfter("url(")
+                    .substringBefore(");")
+
+                val data = ScramblingData(
+                    blockWidth = blockWidth,
+                    blockHeight = blockHeight,
+                    matrix = json.decodeFromString(matrix),
+                )
+
+                Page(i, location, "$scrambledImageUrl#${json.encodeToString(data)}")
+            }
+        }
+    }
+
+    private val blockWidthRegex = Regex("""width:\s*"?\s*\+?\s*(\d+)\s*\+?\s*"?px;""")
+    private val blockHeightRegex = Regex("""height:\s*"?\s*\+?\s*(\d+)\s*\+?\s*"?px;""")
+
+    @Serializable
+    class ScramblingData(
+        val blockWidth: Int,
+        val blockHeight: Int,
+        val matrix: List<List<Double>>,
+    )
+
+    private fun imageDescrambler(chain: Interceptor.Chain): Response {
+        val request = chain.request()
+        val response = chain.proceed(request)
+
+        if (request.url.fragment.isNullOrEmpty()) {
+            return response
+        }
+
+        val scramblingData = json.decodeFromString<ScramblingData>(request.url.fragment!!)
+
+        val scrambledImg = BitmapFactory.decodeStream(response.body.byteStream())
+        val descrambledImg = Bitmap.createBitmap(scrambledImg.width, scrambledImg.height, Bitmap.Config.ARGB_8888)
+        val canvas = Canvas(descrambledImg)
+
+        for (pos in scramblingData.matrix) {
+            val srcRect = Rect(
+                pos[2].toInt(),
+                pos[3].toInt(),
+                pos[2].toInt() + scramblingData.blockWidth,
+                pos[3].toInt() + scramblingData.blockHeight,
+            )
+            val destRect = Rect(
+                pos[0].toInt(),
+                pos[1].toInt(),
+                pos[0].toInt() + scramblingData.blockWidth,
+                pos[1].toInt() + scramblingData.blockHeight,
+            )
+            canvas.drawBitmap(scrambledImg, srcRect, destRect, null)
+        }
+
+        val output = ByteArrayOutputStream()
+        descrambledImg.compress(Bitmap.CompressFormat.JPEG, 90, output)
+
+        val image = output.toByteArray()
+        val body = image.toResponseBody("image/jpeg".toMediaType())
+
+        return response.newBuilder()
+            .body(body)
+            .build()
+    }
+}