Kodik internal ID support, URL decoding

src/main/java/com/backend/extractor/kodik/service/anyame_backend/api/KodikPlayerAPI.java

@@ -13,11 +13,15 @@ public interface KodikPlayerAPI {
     }
 
     default String kinopoiskURL(String id) {
-        return BASE_PLAYER_URL + "kinopoiskID%3D";
+        return BASE_PLAYER_URL + "kinopoiskID%3D" + id;
     }
 
     default String imdbURL(String id) {
-        return BASE_PLAYER_URL + "kinopoiskID%3D";
+        return BASE_PLAYER_URL + "imdbID%3D" + id;
+    }
+
+    default String kodikIDURL(String id) {
+        return BASE_PLAYER_URL + "ID%3D" + id;
     }
 
     @GET("get-player")
@@ -26,9 +30,9 @@ public interface KodikPlayerAPI {
             @Query("hasPlayer") Boolean hasPlayer,
             @Query("url") String url,
             @Query("token") String token,
+            @Query("ID") String kodikId,
             @Query("shikimoriID") String shikimoriID,
             @Query("kinopoiskID") String kinopoiskID,
-            @Query("imdbID") String imdbID
+            @Query("imdbID") String imdbID);
-    );
 
 }

src/main/java/com/backend/extractor/kodik/service/anyame_backend/service/KodikURLDecoderService.java

@@ -0,0 +1,88 @@
+package com.backend.extractor.kodik.service.anyame_backend.service;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+
+import org.springframework.stereotype.Service;
+
+/**
+ * KodikURLDecoder
+ */
+@Service
+// TODO: Test shikimori id: 1535 with KodikURLDecoder, only mp4:hls:manifest is
+// included
+// TODO: Paste some random anime urls to test decoder
+public class KodikURLDecoderService {
+    private static final String ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    private static final String MANIFEST_IDENTIFIER = "mp4:hls:manifest.m3u8";
+    private static final int BASE64_BLOCK_SIZE = 4;
+
+    /**
+     * Convert a character using ROT cipher with specified rotation
+     */
+    private String convertChar(char ch, int rotation) {
+        boolean isLower = Character.isLowerCase(ch);
+        char upperChar = Character.toUpperCase(ch);
+
+        if (ALPHABET.indexOf(upperChar) != -1) {
+            int index = (ALPHABET.indexOf(upperChar) + rotation) % ALPHABET.length();
+            char result = ALPHABET.charAt(index);
+            return isLower ? String.valueOf(Character.toLowerCase(result)) : String.valueOf(result);
+        }
+        return String.valueOf(ch);
+    }
+
+    /**
+     * Try to decrypt the input string by testing all possible ROT cipher rotations
+     */
+    private String tryToDecrypt(String input) {
+        for (int rotation = 0; rotation < 26; rotation++) {
+            StringBuilder rotatedString = new StringBuilder();
+            for (char ch : input.toCharArray()) {
+                rotatedString.append(convertChar(ch, rotation));
+            }
+
+            // Base64 strings must be multiples of 4 characters, add padding if needed
+            int missingPaddingLength = (BASE64_BLOCK_SIZE - (rotatedString.length() % BASE64_BLOCK_SIZE))
+                    % BASE64_BLOCK_SIZE;
+            rotatedString.append("=".repeat(missingPaddingLength));
+
+            try {
+                byte[] decodedBytes = Base64.getDecoder().decode(rotatedString.toString());
+                String decodedResult = new String(decodedBytes, StandardCharsets.UTF_8);
+
+                if (decodedResult.contains(MANIFEST_IDENTIFIER)) {
+                    return decodedResult;
+                }
+            } catch (IllegalArgumentException e) {
+                continue;
+            }
+        }
+
+        throw new KodikDecryptionException("Unable to decrypt the provided URL - no valid rotation found");
+    }
+
+    /**
+     * Public method to get link data from encoded video URL
+     * 
+     * @param videoUrl The encoded video URL
+     * @return The decoded video URL
+     * @throws KodikDecryptionException if decryption fails
+     */
+    public String getLinkData(String videoUrl) {
+        if (videoUrl == null || videoUrl.trim().isEmpty()) {
+            throw new IllegalArgumentException("Video URL cannot be null or empty");
+        }
+
+        return tryToDecrypt(videoUrl);
+    }
+
+    /**
+     * Custom exception for Kodik decryption failures
+     */
+    public static class KodikDecryptionException extends RuntimeException {
+        public KodikDecryptionException(String message) {
+            super(message);
+        }
+    }
+}