fix(en/fmovies): Update vrf & vidsrc extractor (aniyomiorg#2789)

src/en/fmovies/build.gradle

@@ -1,7 +1,7 @@
 ext {
     extName = 'FMovies'
     extClass = '.FMovies'
-    extVersionCode = 15
+    extVersionCode = 16
 }
 
 apply from: "$rootDir/common.gradle"

src/en/fmovies/src/eu/kanade/tachiyomi/animeextension/en/fmovies/FMovies.kt

@@ -49,7 +49,7 @@ class FMovies : ConfigurableAnimeSource, ParsedAnimeHttpSource() {
         Injekt.get<Application>().getSharedPreferences("source_$id", 0x0000)
     }
 
-    private val vrfHelper by lazy { FMoviesHelper(client, headers) }
+    private val utils by lazy { FmoviesUtils() }
 
     // ============================== Popular ===============================
 
@@ -126,8 +126,7 @@ class FMovies : ConfigurableAnimeSource, ParsedAnimeHttpSource() {
         val id = client.newCall(GET(baseUrl + anime.url)).execute().asJsoup()
             .selectFirst("div[data-id]")!!.attr("data-id")
 
-        val vrf = vrfHelper.getVrf(id)
-
+        val vrf = utils.vrfEncrypt(id)
         val vrfHeaders = headers.newBuilder().apply {
             add("Accept", "application/json, text/javascript, */*; q=0.01")
             add("Host", baseUrl.toHttpUrl().host)
@@ -189,7 +188,7 @@ class FMovies : ConfigurableAnimeSource, ParsedAnimeHttpSource() {
 
     override fun videoListRequest(episode: SEpisode): Request {
         val data = json.decodeFromString<EpisodeInfo>(episode.url)
-        val vrf = vrfHelper.getVrf(data.id)
+        val vrf = utils.vrfEncrypt(data.id)
 
         val vrfHeaders = headers.newBuilder()
             .add("Accept", "application/json, text/javascript, */*; q=0.01")
@@ -217,7 +216,7 @@ class FMovies : ConfigurableAnimeSource, ParsedAnimeHttpSource() {
             if (!hosterSelection.contains(name)) return@parallelCatchingFlatMap emptyList()
 
             // Get decrypted url
-            val vrf = vrfHelper.getVrf(server.attr("data-link-id"))
+            val vrf = utils.vrfEncrypt(server.attr("data-link-id"))
 
             val vrfHeaders = headers.newBuilder()
                 .add("Accept", "application/json, text/javascript, */*; q=0.01")
@@ -229,8 +228,7 @@ class FMovies : ConfigurableAnimeSource, ParsedAnimeHttpSource() {
                 GET("$baseUrl/ajax/server/${server.attr("data-link-id")}?vrf=$vrf", headers = vrfHeaders),
             ).await().parseAs<AjaxServerResponse>().result.url
 
-            val decrypted = vrfHelper.decrypt(encrypted)
-
+            val decrypted = utils.vrfDecrypt(encrypted)
             when (name) {
                 "Vidplay", "MyCloud" -> vidsrcExtractor.videosFromUrl(decrypted, name)
                 "Filemoon" -> filemoonExtractor.videosFromUrl(decrypted, headers = headers)

src/en/fmovies/src/eu/kanade/tachiyomi/animeextension/en/fmovies/FMoviesDto.kt

@@ -2,12 +2,6 @@ package eu.kanade.tachiyomi.animeextension.en.fmovies
 
 import kotlinx.serialization.Serializable
 
-@Serializable
-data class VrfResponse(
-    val url: String,
-    val vrfQuery: String? = null,
-)
-
 @Serializable
 data class AjaxResponse(
     val result: String,
@@ -36,21 +30,25 @@ data class FMoviesSubs(
 )
 
 @Serializable
-data class RawResponse(
-    val rawURL: String,
-)
-
-@Serializable
-data class VidsrcResponse(
-    val result: ResultObject,
+data class MediaResponseBody(
+    val status: Int,
+    val result: Result,
 ) {
     @Serializable
-    data class ResultObject(
-        val sources: List<SourceObject>,
+    data class Result(
+        val sources: ArrayList<Source>,
+        val tracks: ArrayList<SubTrack> = ArrayList(),
     ) {
         @Serializable
-        data class SourceObject(
+        data class Source(
+            val file: String,
+        )
+
+        @Serializable
+        data class SubTrack(
             val file: String,
+            val label: String = "",
+            val kind: String,
         )
     }
 }

src/en/fmovies/src/eu/kanade/tachiyomi/animeextension/en/fmovies/FmoviesUtils.kt

@@ -0,0 +1,55 @@
+package eu.kanade.tachiyomi.animeextension.en.fmovies
+
+import android.util.Base64
+import java.net.URLDecoder
+import javax.crypto.Cipher
+import javax.crypto.spec.SecretKeySpec
+
+class FmoviesUtils {
+
+    fun vrfEncrypt(input: String): String {
+        val rc4Key = SecretKeySpec("FWsfu0KQd9vxYGNB".toByteArray(), "RC4")
+        val cipher = Cipher.getInstance("RC4")
+        cipher.init(Cipher.DECRYPT_MODE, rc4Key, cipher.parameters)
+
+        var vrf = cipher.doFinal(input.toByteArray())
+        vrf = Base64.encode(vrf, Base64.URL_SAFE or Base64.NO_WRAP)
+        vrf = rot13(vrf)
+        vrf = Base64.encode(vrf, Base64.URL_SAFE or Base64.NO_WRAP)
+        vrf = vrfShift(vrf)
+        val stringVrf = vrf.toString(Charsets.UTF_8)
+        return java.net.URLEncoder.encode(stringVrf, "utf-8")
+    }
+
+    fun vrfDecrypt(input: String): String {
+        var vrf = input.toByteArray()
+        vrf = Base64.decode(vrf, Base64.URL_SAFE)
+
+        val rc4Key = SecretKeySpec("8z5Ag5wgagfsOuhz".toByteArray(), "RC4")
+        val cipher = Cipher.getInstance("RC4")
+        cipher.init(Cipher.DECRYPT_MODE, rc4Key, cipher.parameters)
+        vrf = cipher.doFinal(vrf)
+
+        return URLDecoder.decode(vrf.toString(Charsets.UTF_8), "utf-8")
+    }
+
+    private fun rot13(vrf: ByteArray): ByteArray {
+        for (i in vrf.indices) {
+            val byte = vrf[i]
+            if (byte in 'A'.code..'Z'.code) {
+                vrf[i] = ((byte - 'A'.code + 13) % 26 + 'A'.code).toByte()
+            } else if (byte in 'a'.code..'z'.code) {
+                vrf[i] = ((byte - 'a'.code + 13) % 26 + 'a'.code).toByte()
+            }
+        }
+        return vrf
+    }
+
+    private fun vrfShift(vrf: ByteArray): ByteArray {
+        for (i in vrf.indices) {
+            val shift = arrayOf(-4, -2, -6, 5, -2)[i % 5]
+            vrf[i] = vrf[i].plus(shift).toByte()
+        }
+        return vrf
+    }
+}