From e41349dd93ffec2b1e383cb4c4dfdb59f6e7edac Mon Sep 17 00:00:00 2001
From: Po Lu
Date: Tue, 1 Aug 2023 21:06:06 +0800
Subject: Update Android port

* doc/emacs/android.texi (Android File System): Describe how to
access real files named /assets or /contents if so required.
* java/org/gnu/emacs/EmacsService.java (validAuthority):
* src/android.c (android_init_emacs_service):
* src/android.h: New function.
* src/androidvfs.c (android_saf_valid_authority_p): New
function.  Wrap the Java function.
(android_saf_root_stat, android_saf_root_access): Don't return
success if no authority by vp->authority's name exists.
(android_saf_tree_from_name): Check validity of string data
before giving it to JNI.
---
 java/org/gnu/emacs/EmacsService.java | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'java')

diff --git a/java/org/gnu/emacs/EmacsService.java b/java/org/gnu/emacs/EmacsService.java
index 3c1bb0855f4..8554dadd06e 100644
--- a/java/org/gnu/emacs/EmacsService.java
+++ b/java/org/gnu/emacs/EmacsService.java
@@ -1769,4 +1769,29 @@ public final class EmacsService extends Service
 	    ? DocumentsContract.getDocumentId (name)
 	    : null);
   }
+
+  /* Return if there is a content provider by the name of AUTHORITY
+     supplying at least one tree URI Emacs retains persistent rights
+     to access.  */
+
+  public boolean
+  validAuthority (String authority)
+  {
+    List<UriPermission> permissions;
+    Uri uri;
+
+    permissions = resolver.getPersistedUriPermissions ();
+
+    for (UriPermission permission : permissions)
+      {
+	uri = permission.getUri ();
+
+	if (DocumentsContract.isTreeUri (uri)
+	    && permission.isReadPermission ()
+	    && uri.getAuthority ().equals (authority))
+	  return true;
+      }
+
+    return false;
+  }
 };
-- 
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