From 4f8dee77ed45d97191c12a0102e2591cefed8d5b Mon Sep 17 00:00:00 2001
From: Gauthier Roebroeck <gauthier.roebroeck@gmail.com>
Date: Mon, 26 Jun 2023 17:41:58 +0800
Subject: [PATCH] feat: use XXH128 for hashing

---
 komga/build.gradle.kts                              |  2 ++
 .../migration/sqlite/V20230626150454__xxhash128.sql |  4 ++++
 .../org/gotson/komga/infrastructure/hash/Hasher.kt  | 13 +++++++++----
 3 files changed, 15 insertions(+), 4 deletions(-)
 create mode 100644 komga/src/flyway/resources/db/migration/sqlite/V20230626150454__xxhash128.sql

diff --git a/komga/build.gradle.kts b/komga/build.gradle.kts
index 0d783fc0b..930ace87f 100644
--- a/komga/build.gradle.kts
+++ b/komga/build.gradle.kts
@@ -84,6 +84,8 @@ dependencies {
 
   implementation("com.ibm.icu:icu4j:73.1")
 
+  implementation("com.appmattus.crypto:cryptohash:0.10.1")
+
   implementation("org.apache.tika:tika-core:2.8.0")
   implementation("org.apache.commons:commons-compress:1.23.0")
   implementation("com.github.junrar:junrar:7.5.4")
diff --git a/komga/src/flyway/resources/db/migration/sqlite/V20230626150454__xxhash128.sql b/komga/src/flyway/resources/db/migration/sqlite/V20230626150454__xxhash128.sql
new file mode 100644
index 000000000..6c6c76fde
--- /dev/null
+++ b/komga/src/flyway/resources/db/migration/sqlite/V20230626150454__xxhash128.sql
@@ -0,0 +1,4 @@
+delete from PAGE_HASH;
+delete from PAGE_HASH_THUMBNAIL;
+update BOOK set FILE_HASH = '';
+update MEDIA_PAGE set FILE_HASH = '';
diff --git a/komga/src/main/kotlin/org/gotson/komga/infrastructure/hash/Hasher.kt b/komga/src/main/kotlin/org/gotson/komga/infrastructure/hash/Hasher.kt
index e8bcca94d..7f441c5a5 100644
--- a/komga/src/main/kotlin/org/gotson/komga/infrastructure/hash/Hasher.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/infrastructure/hash/Hasher.kt
@@ -1,7 +1,7 @@
 package org.gotson.komga.infrastructure.hash
 
+import com.appmattus.crypto.Algorithm
 import mu.KotlinLogging
-import org.apache.commons.codec.digest.XXHash32
 import org.springframework.stereotype.Component
 import java.io.InputStream
 import java.nio.file.Path
@@ -9,7 +9,7 @@ import kotlin.io.path.inputStream
 
 private val logger = KotlinLogging.logger {}
 
-private const val DEFAULT_BUFFER_SIZE = 4096
+private const val DEFAULT_BUFFER_SIZE = 8192
 private const val SEED = 0
 
 @Component
@@ -22,7 +22,7 @@ class Hasher {
   }
 
   fun computeHash(stream: InputStream): String {
-    val hash = XXHash32(SEED)
+    val hash = Algorithm.XXH3_128.Seeded(SEED.toLong()).createDigest()
 
     stream.use {
       val buffer = ByteArray(DEFAULT_BUFFER_SIZE)
@@ -34,6 +34,11 @@ class Hasher {
       } while (len >= 0)
     }
 
-    return hash.value.toString(36)
+    return hash.digest().toHexString()
+  }
+
+  @OptIn(ExperimentalUnsignedTypes::class)
+  private fun ByteArray.toHexString(): String = asUByteArray().joinToString("") {
+    it.toString(16).padStart(2, '0')
   }
 }