From 47d85b7bab7c551c129ce387661a799d59b0f5ea Mon Sep 17 00:00:00 2001
From: Theodore Dubois <tblodt@icloud.com>
Date: Fri, 4 Sep 2020 16:29:01 -0700
Subject: [PATCH] Fix file providers (#346)

* Make file providers work at all

NSExtensionFileProviderDocumentGroup must be a valid app group. This
updates it to use the new name of the app group including the team ID.

* Update AltStore/Operations/ResignAppOperation.swift
---
 AltStore/Operations/ResignAppOperation.swift | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/AltStore/Operations/ResignAppOperation.swift b/AltStore/Operations/ResignAppOperation.swift
index f95b26d6..e2555737 100644
--- a/AltStore/Operations/ResignAppOperation.swift
+++ b/AltStore/Operations/ResignAppOperation.swift
@@ -113,15 +113,24 @@ private extension ResignAppOperation
             
             infoDictionary[kCFBundleIdentifierKey as String] = profile.bundleIdentifier
             infoDictionary[Bundle.Info.altBundleID] = identifier
-            
+
             for (key, value) in additionalInfoDictionaryValues
             {
                 infoDictionary[key] = value
             }
-            
+
             if let appGroups = profile.entitlements[.appGroups] as? [String]
             {
                 infoDictionary[Bundle.Info.appGroups] = appGroups
+
+                // To keep file providers working, remap the NSExtensionFileProviderDocumentGroup, if there is one.
+                if var extensionInfo = infoDictionary["NSExtension"] as? [String: Any],
+                    let appGroup = extensionInfo["NSExtensionFileProviderDocumentGroup"] as? String,
+                    let localAppGroup = appGroups.filter({ $0.contains(appGroup) }).min(by: { $0.count < $1.count })
+                {
+                    extensionInfo["NSExtensionFileProviderDocumentGroup"] = localAppGroup
+                    infoDictionary["NSExtension"] = extensionInfo
+                }
             }
             
             // Add app-specific exported UTI so we can check later if this app (extension) is installed or not.