feat(binary i3d): add a button to fetch binary converter from GDN

Add a button to fetch the binary i3d converter directly from GDN if provided a valid login.
For security reasons the login will not be remembered neither in the session nor between sessions.

addon/i3dio/.gitignore

@@ -1,2 +1,2 @@
 exporter_old.py
-
+**/i3dConverter.exe

addon/i3dio/ui/addon_preferences.py

@@ -3,7 +3,7 @@
 
 import bpy
 from bpy.types import AddonPreferences
-from bpy.props import (StringProperty, EnumProperty)
+from bpy.props import (StringProperty, EnumProperty, BoolProperty)
 
 from .. import xml_i3d
 
@@ -78,6 +78,7 @@ def draw(self, context):
                 row.prop(self, 'i3d_converter_path')
                 if(next((True for addon in addon_utils.modules() if addon.bl_info.get("name") == "GIANTS I3D Exporter Tools"), False)):
                     row.operator('i3dio.i3d_converter_path_from_giants_addon', text="", icon="EVENT_G")
+                row.operator("i3dio.download_i3d_converter", text="", icon='WORLD_DATA')
             case 'AUTOMATIC':
                 #row = c_box.row()
                 #row.operator("i3dio.download_i3d_converter", text="Manage Automatic Download")
@@ -101,11 +102,79 @@ def execute(self, context):
 class I3D_IO_OT_download_i3d_converter(bpy.types.Operator):
     bl_idname = "i3dio.download_i3d_converter"
     bl_label = "Download I3D Converter"
-    bl_description = "Download I3D Converter"
+    bl_description = "Download from Giants Developer Network (Requires valid login)"
     bl_options = {'INTERNAL'}
 
+    email: StringProperty(name="Email", default="")
+    password: StringProperty(name="Password", default="", subtype="PASSWORD")
+
     def execute(self, context):
-        return {"FINISHED"}
+        import re
+        from io import BytesIO
+        from requests import Session
+        from zipfile import (ZipFile, BadZipfile)
+        from shutil import copyfileobj
+
+        # Attempt to login using provided credentials
+        session = Session()
+        request = session.post('https://gdn.giants-software.com/index.php', data={'greenstoneX':'1', 'redstoneX':self.email, 'bluestoneX':self.password})
+
+        ## Clear email and password after usage
+        self.email = ""
+        self.password = ""
+
+        # Check if login was successful
+        if '<li id="topmenu1"><a href="index.php?logout=true" accesskey="1" title="">Logout</a></li>' not in request.text:
+            self.report({'WARNING'}, f"Could not login to https://gdn.giants-software.com/index.php with provided credentials!")
+            return {'CANCELLED'}
+
+        # Get download page
+        request = session.get('https://gdn.giants-software.com/downloads.php')
+
+        # Find the download IDs for the all Giants Blender Exporters (As long as Giants names them the same way)
+        result = re.findall(r'href="download.php\?downloadId=([0-9]+)">Blender Exporter Plugins v([0-9]+.[0-9]+.[0-9]+)', request.text)
+
+        # Assume the first found is the newest
+        download_id, exporter_version = result[0]
+
+        # Request download of Giants I3D Exporter
+        download_url = f'https://gdn.giants-software.com/download.php?downloadId={download_id}'
+        request = session.get(download_url)
+
+        try:
+            # Create in-memory zipfile from downloaded content
+            zipfile = ZipFile(BytesIO(request.content), 'r')
+            # Find path to this exporter addon
+            binary_path = 'i3dConverter.exe'
+            for addon in addon_utils.modules():
+                if addon.bl_info.get("name") == "Unofficial GIANTS I3D Exporter Tools":
+                    binary_path = pathlib.PurePath(addon.__file__).parent.joinpath(binary_path)
+            # Extract I3D Converter Binary from zipfile and save to disk
+            with zipfile.open('io_export_i3d/util/i3dConverter.exe') as zipped_binary, open(binary_path, 'wb') as saved_binary:
+                copyfileobj(zipped_binary, saved_binary)
+            # Set I3D Converter Binary path to newly downloaded converter
+            bpy.context.preferences.addons['i3dio'].preferences.i3d_converter_path = str(binary_path)
+        except (BadZipfile, KeyError, OSError) as e:
+            self.report({'WARNING'}, f"The Community I3D Exporter did not succesfully fetch and install the Giants I3D Converter binary! ({e})")
+            return {'CANCELLED'}
+
+        self.report({'INFO'}, f"Fetched i3dConverter.exe from version {exporter_version} of the Giants Exporter downloaded from {download_url}")
+        return {'FINISHED'}
+
+    def invoke(self, context, event):
+        wm = bpy.context.window_manager
+        # Width increased to fit the warning about the download freezing the UI
+        return wm.invoke_props_dialog(self, width=350)
+
+    def draw(self, context):
+        layout = self.layout
+        row = layout.row()
+        row.prop(self, "email")
+        row = layout.row()
+        row.prop(self, "password")
+        row = layout.row()
+        row.alignment = "CENTER"
+        row.label(text="Blender UI will appear frozen during file download (~15MB) ", icon="ERROR")
 
 
 def register():