MangaWorld: Fix MWCookie requirement (#7319)

* Create ShittyRedirectionInterceptor.kt

* Add redirection interceptor

* Update version code

* Don't be lazy

* Avoid NullPointerExceptions when searching for MWCookie

* Update MangaWorld.kt with new name for interceptor

* Rename class and store regex somewhere else

* Check for content-type instead of header and return res correctly

* Use .contains to not fail on longer types

* Revert "vary" method to check for the JS challenge

The "text/html" method breaks way too easily, the response.headers["vary"] just works fine.

lib-multisrc/mangaworld/build.gradle.kts

@@ -2,4 +2,4 @@ plugins {
     id("lib-multisrc")
 }
 
-baseVersionCode = 2
+baseVersionCode = 3

lib-multisrc/mangaworld/src/eu/kanade/tachiyomi/multisrc/mangaworld/CookieRedirectInterceptor.kt

@@ -0,0 +1,35 @@
+package eu.kanade.tachiyomi.multisrc.mangaworld
+
+import eu.kanade.tachiyomi.network.GET
+import okhttp3.Cookie
+import okhttp3.Interceptor
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.Response
+import okhttp3.ResponseBody.Companion.toResponseBody
+
+class CookieRedirectInterceptor(private val client: OkHttpClient) : Interceptor {
+    private val cookieRegex = Regex("""document\.cookie="(MWCookie[^"]+)""")
+
+    override fun intercept(chain: Interceptor.Chain): Response {
+        val request = chain.request()
+        val response = chain.proceed(request)
+        // ignore requests that already have completed the JS challenge
+        if (response.headers["vary"] != null) return response
+
+        val content = response.body.string()
+        val results = cookieRegex.find(content)
+            ?: return response.newBuilder().body(content.toResponseBody(response.body.contentType())).build()
+        val (cookieString) = results.destructured
+        return chain.proceed(loadCookie(request, cookieString))
+    }
+
+    private fun loadCookie(request: Request, cookieString: String): Request {
+        val cookie = Cookie.parse(request.url, cookieString)!!
+        client.cookieJar.saveFromResponse(request.url, listOf(cookie))
+        val headers = request.headers.newBuilder()
+            .add("Cookie", cookie.toString())
+            .build()
+        return GET(request.url, headers)
+    }
+}

lib-multisrc/mangaworld/src/eu/kanade/tachiyomi/multisrc/mangaworld/MangaWorld.kt

@@ -28,7 +28,11 @@ abstract class MangaWorld(
 ) : ParsedHttpSource() {
 
     override val supportsLatest = true
-    override val client: OkHttpClient = network.cloudflareClient
+
+    // CookieRedirectInterceptor extracts MWCookie from the page's JS code, applies it and then redirects to the page
+    override val client: OkHttpClient = network.cloudflareClient.newBuilder()
+        .addInterceptor(CookieRedirectInterceptor(network.cloudflareClient))
+        .build()
 
     companion object {
         protected val CHAPTER_NUMBER_REGEX by lazy { Regex("""(?i)capitolo\s([0-9]+)""") }