src: add POST cache/delete method

Add API REST method to delete cache contents.

Resquest payload structure:
{
    'images': ['windows.img', 'linux.img']
}

The client will try to delete as many images in cache as available
with names matching the list of filenames in the 'images' field.

Resquest response structure:
{
    'cache': [
        {'name': 'windows.img', 'size': 2432370213, checksum: '5d4dcc677bc19f40a647d0002f4ade90'},
        {'name': 'linux.img', 'size': 243234534213, checksum: '3eb22f888f88a55ad954f55644e1192e'}
    ]
}

src/linux/ogOperations.py

@@ -55,6 +55,9 @@ class OgLinuxOperations:
     def image_create(self, path, request, ogRest):
         raise NotImplementedError
 
+    def cache_delete(self, request, ogRest):
+        raise NotImplementedError
+
     def refresh(self, ogRest):
         return {"status": "LINUX"}
 

src/live/ogOperations.py

@@ -576,6 +576,46 @@ class OgLiveOperations:
         logging.info('Image creation command OK')
         return image_info
 
+    def cache_delete(self, request, ogRest):
+        images = request.getImages()
+        deleted_images = []
+
+        if not mount_cache():
+            return
+
+        img_dir = OG_CACHE_IMAGE_PATH
+
+        if not os.path.isdir(img_dir):
+            return cache_contents
+
+        for file_name in os.listdir(img_dir):
+            file_path = os.path.join(img_dir, file_name)
+
+            if not os.path.isfile(file_path):
+                continue
+            if not file_name.endswith('.img'):
+                continue
+            if os.sep in file_name:
+                logging.info(f'Detected cache deletion request of filename with a path, ignoring {file_name}')
+                continue
+
+            if file_name in images:
+                os.remove(file_path)
+
+                csum_path = file_path + '.full.sum'
+                if not os.path.isfile(csum_path):
+                    logging.info(f'Missing checksum file for {file_path}')
+                    continue
+
+                os.remove(csum_path)
+
+        result = {'cache': self._get_cache_contents()}
+
+        self._restartBrowser(self._url)
+
+        logging.info('Sending response to cache/delete request')
+        return result
+
     def refresh(self, ogRest):
         self._restartBrowser(self._url_log)
 

src/ogRest.py

@@ -215,6 +215,19 @@ class ogThread():
 		client.send(response.get())
 		ogRest.state = ThreadState.IDLE
 
+	def cache_delete(client, request, ogRest):
+		try:
+			out = ogRest.operations.cache_delete(request, ogRest)
+		except Exception as e:
+			ogRest.send_internal_server_error(client, exc=e)
+			return
+
+		json_body = jsonBody(out)
+
+		response = restResponse(ogResponses.OK, json_body, seq=client.seq)
+		client.send(response.get())
+		ogRest.state = ThreadState.IDLE
+
 	def refresh(client, ogRest):
 		try:
 			out = ogRest.operations.refresh(ogRest)
@@ -328,6 +341,8 @@ class ogRest():
 				self.process_stop(client)
 			elif ("image/create" in URI):
 				self.process_imagecreate(client, request)
+			elif ("cache/delete" in URI):
+				self.process_cache_delete(client, request)
 			else:
 				logging.warn('Unsupported request: %s',
 					    URI[:ogRest.LOG_LENGTH])
@@ -430,5 +445,8 @@ class ogRest():
 	def process_imagecreate(self, client, request):
 		threading.Thread(target=ogThread.image_create, args=(client, request, self,)).start()
 
+	def process_cache_delete(self, client, request):
+		threading.Thread(target=ogThread.cache_delete, args=(client, request, self,)).start()
+
 	def process_refresh(self, client):
 		threading.Thread(target=ogThread.refresh, args=(client, self,)).start()

src/restRequest.py

@@ -37,6 +37,7 @@ class restRequest:
 		self.code = None
 		self.seq = None
 		self.backup = None
+		self.images = None
 
 	def parser(self,data):
 		self.request_line, self.headers_alone = data.split('\n', 1)
@@ -75,6 +76,9 @@ class restRequest:
 				except:
 					pass
 
+			if "images" in json_param:
+				self.images = json_param["images"]
+
 			if "disk" in json_param:
 				self.disk = json_param["disk"]
 
@@ -114,6 +118,9 @@ class restRequest:
 	def get_method(self):
 		return self.method
 
+	def getImages(self):
+		return self.images
+
 	def get_uri(self):
 		return self.URI
 

src/virtual/ogOperations.py

@@ -458,6 +458,9 @@ class OgVirtualOperations:
 
         return True
 
+    def cache_delete(self, request, ogRest):
+        raise NotImplementedError
+
     def software(self, request, path, ogRest):
         DPKG_PATH = '/var/lib/dpkg/status'
 

src/windows/ogOperations.py

@@ -110,6 +110,9 @@ class OgWindowsOperations:
     def image_create(self, path, request, ogRest):
         raise NotImplementedError
 
+    def cache_delete(self, request, ogRest):
+        raise NotImplementedError
+
     def refresh(self, ogRest):
         return {"status": "WIN"}