Sample for making GCS object public-read

Author: Jerjou Cheng

google-cloud-examples/src/main/java/com/google/cloud/examples/storage/snippets/StorageSnippets.java

@@ -908,6 +908,21 @@ public Acl updateBlobAcl(String bucketName, String blobName, long blobGeneration
     return acl;
   }
 
+  /**
+   * Example of updating a blob to be public-read.
+   */
+  // [TARGET createAcl(BlobId, Acl)]
+  // [VARIABLE "my_unique_bucket"]
+  // [VARIABLE "my_blob_name"]
+  // [VARIABLE 42]
+  public Acl blobToPublicRead(String bucketName, String blobName, long blobGeneration) {
+    // [START storageMakePublic]
+    BlobId blobId = BlobId.of(bucketName, blobName, blobGeneration);
+    Acl acl = storage.createAcl(blobId, Acl.of(User.ofAllUsers(), Role.READER));
+    // [END storageMakePublic]
+    return acl;
+  }
+
   /**
    * Example of listing the ACL entries for a blob.
    */

google-cloud-examples/src/test/java/com/google/cloud/examples/storage/snippets/ITStorageSnippets.java

@@ -27,6 +27,7 @@
 
 import com.google.cloud.Page;
 import com.google.cloud.storage.Acl;
+import com.google.cloud.storage.Acl.User;
 import com.google.cloud.storage.Blob;
 import com.google.cloud.storage.BlobId;
 import com.google.cloud.storage.BlobInfo;
@@ -319,6 +320,14 @@ public void testBlobAcl() {
     Set<Acl> acls = Sets.newHashSet(
         storageSnippets.listBlobAcls(BUCKET, blobName, createdBlob.getGeneration()));
     assertTrue(acls.contains(updatedAcl));
+
+    updatedAcl = storageSnippets.blobToPublicRead(BUCKET, blobName, createdBlob.getGeneration());
+    assertEquals(Acl.Role.READER, updatedAcl.getRole());
+    assertEquals(User.ofAllUsers(), updatedAcl.getEntity());
+    acls = Sets.newHashSet(
+        storageSnippets.listBlobAcls(BUCKET, blobName, createdBlob.getGeneration()));
+    assertTrue(acls.contains(updatedAcl));
+
     assertTrue(storageSnippets.deleteBlobAcl(BUCKET, blobName, createdBlob.getGeneration()));
     assertNull(storageSnippets.getBlobAcl(BUCKET, blobName, createdBlob.getGeneration()));
     // test non-existing blob

google-cloud-storage/src/main/java/com/google/cloud/storage/Storage.java

@@ -2456,6 +2456,15 @@ public static Builder newBuilder() {
    * Acl acl = storage.createAcl(blobId, Acl.of(User.ofAllAuthenticatedUsers(), Role.READER));
    * }</pre>
    *
+   * <p>Example of updating a blob to be public-read.
+   * <pre> {@code
+   * String bucketName = "my_unique_bucket";
+   * String blobName = "my_blob_name";
+   * long blobGeneration = 42;
+   * BlobId blobId = BlobId.of(bucketName, blobName, blobGeneration);
+   * Acl acl = storage.createAcl(blobId, Acl.of(User.ofAllUsers(), Role.READER));
+   * }</pre>
+   *
    * @throws StorageException upon failure
    */
   Acl createAcl(BlobId blob, Acl acl);