DemonSect: Fix downloads (#3634)

Fix downloads

src/pt/prismascans/build.gradle

@@ -3,7 +3,7 @@ ext {
     extClass = '.DemonSect'
     themePkg = 'madara'
     baseUrl = 'https://dsectcomics.org'
-    overrideVersionCode = 7
+    overrideVersionCode = 8
 }
 
 apply from: "$rootDir/common.gradle"

src/pt/prismascans/src/eu/kanade/tachiyomi/extension/pt/prismascans/DemonSect.kt

@@ -4,7 +4,9 @@ import eu.kanade.tachiyomi.multisrc.madara.Madara
 import eu.kanade.tachiyomi.network.asObservable
 import eu.kanade.tachiyomi.network.interceptor.rateLimit
 import eu.kanade.tachiyomi.source.model.MangasPage
+import okhttp3.MediaType.Companion.toMediaType
 import okhttp3.OkHttpClient
+import okhttp3.ResponseBody.Companion.toResponseBody
 import okio.IOException
 import rx.Observable
 import java.text.SimpleDateFormat
@@ -30,6 +32,20 @@ class DemonSect : Madara(
             }
             response
         }
+        .addInterceptor { chain ->
+            val response = chain.proceed(chain.request())
+            val mime = response.headers["Content-Type"]
+            if (response.isSuccessful) {
+                if (mime == "application/octet-stream" || mime == null) {
+                    // Fix image content type
+                    val type = "image/jpeg".toMediaType()
+                    val body = response.body.bytes().toResponseBody(type)
+                    return@addInterceptor response.newBuilder().body(body)
+                        .header("Content-Type", "image/jpeg").build()
+                }
+            }
+            response
+        }
         .rateLimit(1, 2, TimeUnit.SECONDS)
         .build()