Add METS download link to AIP page. (#46) (#207)

Adds a METS download link to the AIP detail page.

AIPscan/Reporter/templates/aip.html

@@ -22,6 +22,8 @@
   Originals: {{ original_file_count }}
   <br>
   Preservation copies: {{ preservation_file_count }}
+  <br>
+  <a href="{{ url_for('reporter.download_mets', aip_id=aip.id) }}">Download METS</a>
 </div>
 
 <h3>Original files</h3>

AIPscan/Reporter/tests/test_views.py

@@ -0,0 +1,34 @@
+from flask import current_app
+from werkzeug.datastructures import Headers
+
+
+def test_download_mets(app_with_populated_files, mocker):
+    # Mock storage server API request response
+    request = mocker.patch("requests.get")
+
+    class MockResponse(object):
+        pass
+
+    return_response = MockResponse()
+    return_response.content = bytes("METS content", "utf-8")
+    return_response.status_code = 200
+
+    request.return_value = return_response
+
+    # Test view logic
+    with current_app.test_client() as test_client:
+        response = test_client.get("/reporter/download_mets/1")
+
+        assert response.headers == Headers(
+            [
+                (
+                    "Content-Disposition",
+                    'attachment; filename="METS-111111111111-1111-1111-11111111.xml"',
+                ),
+                ("Content-Length", "12"),
+                ("Content-Type", "text/html; charset=utf-8"),
+            ]
+        )
+
+        assert response.data == return_response.content
+        assert response.status_code == return_response.status_code

AIPscan/Reporter/views.py

@@ -7,8 +7,10 @@
 
 from datetime import datetime
 
-from flask import jsonify, make_response, render_template, request, session
+import requests
+from flask import Response, jsonify, make_response, render_template, request, session
 
+from AIPscan.Aggregator.task_helpers import get_mets_url
 from AIPscan.models import (
     AIP,
     Event,
@@ -272,3 +274,29 @@ def update_dates():
         req = request.get_json()
         session["end_date"] = request.json.get("end_date")
         return make_response(jsonify(req), 200)
+
+
+@reporter.route("/download_mets/<aip_id>", methods=["GET"])
+def download_mets(aip_id):
+    aip = AIP.query.get(aip_id)
+    storage_service = StorageService.query.get(aip.storage_service_id)
+
+    api_url = {
+        "baseUrl": storage_service.url,
+        "userName": storage_service.user_name,
+        "apiKey": storage_service.api_key,
+    }
+
+    mets_response = requests.get(
+        get_mets_url(
+            api_url,
+            aip.uuid,
+            f"{aip.transfer_name}-{aip.uuid}/data/METS.{aip.uuid}.xml",
+        )
+    )
+
+    headers = {
+        "Content-Disposition": f'attachment; filename="METS-{aip.uuid}.xml"',
+        "Content-length": len(mets_response.content),
+    }
+    return Response(mets_response.content, mets_response.status_code, headers)