Application proxy changes for private blob storage (#67)

Author: yiliuTo

asset-manager/web/src/main/java/com/microsoft/migration/assets/service/AwsS3Service.java

@@ -146,11 +146,8 @@ private String extractFilename(String key) {
     }
 
     private String generateUrl(String key) {
-        GetUrlRequest request = GetUrlRequest.builder()
-                .bucket(bucketName)
-                .key(key)
-                .build();
-        return s3Client.utilities().getUrl(request).toString();
+        // Use application proxy URL for consistent behavior across storage types
+        return "/s3/view/" + key;
     }
 
     private String generateKey(String filename) {

asset-manager/web/src/main/resources/templates/list.html

@@ -7,7 +7,7 @@ <h2>Your Images</h2>
         <div class="row mt-4" id="imageContainer" th:if="${not #lists.isEmpty(objects)}">
             <div class="col-md-4 mb-4" th:each="object : ${objects}" th:attr="data-key=${object.key}">
                 <div class="card">
-                    <img th:src="${object.url}" class="card-img-top" alt="Image preview" style="height: 200px; object-fit: cover;">
+                    <img th:src="@{'/s3/view/' + ${object.key}}" class="card-img-top" alt="Image preview" style="height: 200px; object-fit: cover;">
                     <div class="card-body">
                         <h5 class="card-title text-truncate" th:text="${object.name}">Image name</h5>
                         <p class="card-text">

asset-manager/web/src/main/resources/templates/view.html

@@ -18,7 +18,7 @@
                 <div class="card-header d-flex justify-content-between align-items-center">
                     <h3 class="card-title mb-0" th:text="${object.name}">Image Name</h3>
                     <div>
-                        <a th:href="${object.url}" download class="btn btn-outline-primary btn-sm me-2">
+                        <a th:href="@{'/s3/view/' + ${object.key}}" download class="btn btn-outline-primary btn-sm me-2">
                             <i class="bi bi-download"></i> Download
                         </a>
                         <form th:action="@{'/s3/delete/' + ${object.key}}" method="post" class="d-inline" 
@@ -30,7 +30,7 @@ <h3 class="card-title mb-0" th:text="${object.name}">Image Name</h3>
                     </div>
                 </div>
                 <div class="card-body text-center">
-                    <img th:src="${object.url}" class="img-fluid" alt="Image preview" style="max-height: 70vh;">
+                    <img th:src="@{'/s3/view/' + ${object.key}}" class="img-fluid" alt="Image preview" style="max-height: 70vh;">
                 </div>
                 <div class="card-footer">
                     <div class="row">