feat(storage): respect com.google.cloud.storage.Hasher.read system property in JSON read paths (#13526)

nidhiii-27 · web-flow · commit 36140bf4b14e · 2026-06-24T11:15:06.000+05:30
This PR changes the checksum verification on JSON read paths to use
`Hasher.readHasher()` instead of `Hasher.defaultHasher()`. This respects
the system property `com.google.cloud.storage.Hasher.read` to allow
disabling of client-side checksums on JSON read paths.

[Generated-by: AI]
diff --git a/java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/HttpDownloadSessionBuilder.java b/java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/HttpDownloadSessionBuilder.java
@@ -58,7 +58,7 @@ public static final class ReadableByteChannelSessionBuilder {
 
     private ReadableByteChannelSessionBuilder(BlobReadChannelContext blobReadChannelContext) {
       this.blobReadChannelContext = blobReadChannelContext;
-      this.hasher = Hasher.defaultHasher();
+      this.hasher = Hasher.readHasher();
       this.autoGzipDecompression = false;
     }
 
diff --git a/java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/HttpStorageRpcHasherHelper.java b/java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/HttpStorageRpcHasherHelper.java
@@ -40,7 +40,7 @@ public final class HttpStorageRpcHasherHelper {
   private final Hasher hasher;
 
   private HttpStorageRpcHasherHelper() {
-    hasher = Hasher.defaultHasher();
+    hasher = Hasher.readHasher();
   }
 
   /**

Original file line number	Diff line number	Diff line change
`@@ -58,7 +58,7 @@ public static final class ReadableByteChannelSessionBuilder {`
`58`	`58`
`59`	`59`	`private ReadableByteChannelSessionBuilder(BlobReadChannelContext blobReadChannelContext) {`
`60`	`60`	`this.blobReadChannelContext = blobReadChannelContext;`
`61`		`- this.hasher = Hasher.defaultHasher();`
	`61`	`+ this.hasher = Hasher.readHasher();`
`62`	`62`	`this.autoGzipDecompression = false;`
`63`	`63`	`}`
`64`	`64`
Original file line number	Diff line number	Diff line change
`@@ -40,7 +40,7 @@ public final class HttpStorageRpcHasherHelper {`
`40`	`40`	`private final Hasher hasher;`
`41`	`41`
`42`	`42`	`private HttpStorageRpcHasherHelper() {`
`43`		`- hasher = Hasher.defaultHasher();`
	`43`	`+ hasher = Hasher.readHasher();`
`44`	`44`	`}`
`45`	`45`
`46`	`46`	`/**`