PluginBrowser now retrieves list of plugins from the server

CURA-3856

plugins/PluginBrowser/PluginBrowser.py

@@ -1,10 +1,13 @@
 # Copyright (c) 2017 Ultimaker B.V.
 # PluginBrowser is released under the terms of the AGPLv3 or higher.
-
-
 from UM.Extension import Extension
 from UM.i18n import i18nCatalog
+from UM.Logger import Logger
 
+from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkRequest
+from PyQt5.QtCore import QUrl
+
+import json
 
 i18n_catalog = i18nCatalog("cura")
 
@@ -13,6 +16,41 @@ class PluginBrowser(Extension):
     def __init__(self):
         super().__init__()
         self.addMenuItem(i18n_catalog.i18n("Browse plugins"), self.browsePlugins)
+        self._api_version = 1
+        self._api_url = "http://software.ultimaker.com/cura/v%s/" % self._api_version
+
+        self._plugin_list_request = None
+        self._network_manager = None
+
+        self._plugins_metadata = []
 
     def browsePlugins(self):
-        pass
+        self._createNetworkManager()
+        self.requestPluginList()
+        #TODO: Show popup with populated plugin data.
+
+    def requestPluginList(self):
+        url = QUrl(self._api_url + "plugins")
+        self._plugin_list_request = QNetworkRequest(url)
+        self._network_manager.get(self._plugin_list_request)
+
+    def _onRequestFinished(self, reply):
+        reply_url = reply.url().toString()
+        if reply.operation() == QNetworkAccessManager.GetOperation:
+            if reply_url == self._api_url + "plugins":
+                try:
+                    json_data = json.loads(bytes(reply.readAll()).decode("utf-8"))
+                    self._plugins_metadata = json_data
+                except json.decoder.JSONDecodeError:
+                    Logger.log("w", "Received an invalid print job state message: Not valid JSON.")
+                    return
+        else:
+            # Ignore any operation that is not a get operation
+            pass
+
+    def _createNetworkManager(self):
+        if self._network_manager:
+            self._network_manager.finished.disconnect(self._onRequestFinished)
+
+        self._network_manager = QNetworkAccessManager()
+        self._network_manager.finished.connect(self._onRequestFinished)