From d7e2bf651b62a2a9174e2a766557052c17439047 Mon Sep 17 00:00:00 2001
From: Manuel Hude <e1502712@student.tuwien.ac.at>
Date: Mon, 30 Nov 2020 14:23:32 +0100
Subject: [PATCH] delete functionality for metadata

---
 iotclient/iot_client.py             | 28 ++++++++++++++++++++++++++++
 middleware/app_be/urls.py           |  1 +
 middleware/app_be/views/rest_api.py | 18 ++++++++++++++++++
 3 files changed, 47 insertions(+)

diff --git a/iotclient/iot_client.py b/iotclient/iot_client.py
index eba5fce..d33050d 100644
--- a/iotclient/iot_client.py
+++ b/iotclient/iot_client.py
@@ -69,6 +69,21 @@ def get_image(identifier):
     return True
 
 
+def delete_image(identifier):
+    print("Deleting image with identifier "+identifier)
+
+    baseurl = "http://127.0.0.1:8000"
+    get_url = "/image/delete/"+identifier
+
+    try:
+        response = requests.delete(baseurl + get_url)
+        payload = response.json()
+        print(payload)
+    except os.error:
+        print("Error deleting request")
+    return True
+
+
 
 def get_all():
     print("Getting all images")
@@ -132,6 +147,7 @@ while (command.lower() not in ["exit", "quit", "end"]):
         print("trigger - next image in line is sent to backend")
         print("fetch - gets the next image from database if exists")
         print("fetchall - get all images")
+        print("delete - delets the next image from db if exists")
         print("rapid <#amount> - next <amound> images in line are sent to backend in 2 second intervals")
         print("skip [<#amount>] - skips the next <amount> number of images in line or 1 if no <amount> is given")
         print("set <#index> - sets image on given <index> as next in line")
@@ -227,6 +243,18 @@ while (command.lower() not in ["exit", "quit", "end"]):
         get_all()
         index = index + 1
 
+    if command.lower() == "delete":
+        if metadata is None:
+            print("No metadata loaded")
+            continue
+        if image_folder is None:
+            print("No image folder selected")
+            continue
+        meta_payload = metadata[index]
+        filename = meta_payload['filename']
+        delete_image(filename[:-4])
+        index = index + 1
+
     if command.lower() == "rapid":
         if metadata is None:
             print("No metadata loaded")
diff --git a/middleware/app_be/urls.py b/middleware/app_be/urls.py
index b727930..1896baa 100644
--- a/middleware/app_be/urls.py
+++ b/middleware/app_be/urls.py
@@ -25,6 +25,7 @@ urlpatterns = [
     url(r'^test/', TestApiClass.test_api),
     url(r'^image/get/all$', ImageEndpoint.image_api_get_all),
     url(r'^image/get/(?P<identifier>[\w-]+)$', ImageEndpoint.image_api_get_single),
+    url(r'^image/delete/(?P<identifier>[\w-]+)$', ImageEndpoint.image_api_delete),
     url(r'^image/post$', ImageEndpoint.image_api_post)
 ]
 
diff --git a/middleware/app_be/views/rest_api.py b/middleware/app_be/views/rest_api.py
index 41616f0..b65a0b0 100644
--- a/middleware/app_be/views/rest_api.py
+++ b/middleware/app_be/views/rest_api.py
@@ -107,3 +107,21 @@ class ImageEndpoint:
 
         return JsonResponse({'id': identifier, 'filename': filename},
                             safe=False)  # 'metadata': metadata response beinhaltet ObjectId welche nicht serializable is?
+
+    @staticmethod
+    @api_view(['DELETE'])
+    def image_api_delete(request: HttpRequest, identifier):
+
+        logger.debug('Image DELETE single call: {}'.format(request))
+
+        instance = MongoManager.getInstance()
+
+        db = instance.AIC
+        col = db.metadata
+
+        try:
+            col.delete_one({"identifier": identifier})
+        except:
+            print("Could not delete Metadata")
+
+        return JsonResponse({'Result': 'success1'}, safe=False)
\ No newline at end of file