feat: add ListObjects method & relevant e2e tests

testing/testdata/storage/variable.tf

@@ -16,7 +16,47 @@ locals {
   hashicorp_email = split(":", data.aws_caller_identity.current.user_id)[1]
   tags = {
     User        = split(":", data.aws_caller_identity.current.user_id)[1]
-    Repo        = "boundary-plugin-aws" 
+    Repo        = "boundary-plugin-aws"
     Environment = "Demo"
   }
+
+  # total number of objects of each type to create
+  s3_pagination_test_object_count = 350
+  # Dynamically build a flat map of S3 objects:
+  # - root-level text files
+  # - nested JSON files
+  # - placeholder "empty directories"
+  # - some static files in list-objects directory
+  # This map is consumed directly by an aws_s3_object resource
+  s3_files = merge(
+    # Root-level text files
+    {
+      for i in range(local.s3_pagination_test_object_count) :
+      "list-objects-paginated/root-file-${i}.txt" => "This is a root-level file #${i}."
+    },
+
+    # Nested JSON files inside sub-directories
+    {
+      for i in range(local.s3_pagination_test_object_count) :
+      "list-objects-paginated/nested-dir-${i}/data-file-${i}.json" =>
+      jsonencode({
+        id      = i,
+        message = "This is a nested JSON file #${i}."
+      })
+    },
+
+    # "Empty" directories (in S3 these are just placeholder objects ending with `/`)
+    {
+      for i in range(local.s3_pagination_test_object_count) :
+      "list-objects-paginated/empty-dir-${i}/dir-${i}/" => "" # zero-length object to mimic directory
+    },
+
+    # Static example files in list-objects directory
+    {
+      "list-objects/file1.txt"            = "This is the content for file 1."
+      "list-objects/data.json"            = jsonencode({ key = "value", items = [1, 2, 3] })
+      "list-objects/nested-dir/file2.txt" = "This is a nested file."
+      "list-objects/empty-nested-dir/"    = ""
+    }
+  )
 }