Implemented file name shortening by d2dyno1 · Pull Request #129 · securefolderfs-community/SecureFolderFS

d2dyno1 · 2026-05-21T15:17:13Z

Tasklist

[Recycle Bin] Write sidecar files when recovering from the Recycle Bin
[Other] Implement shortening for NativePathHelpers
[Other] Detect correct shortening threshold when restoring vaults.
[FS] Implement shortening in Dokany
[FS] Implement shortening in WinFsp
[FS] Implement shortening in FUSE
[Health] Detect and delete orphan sidecar files
[Health] Re-adjust fixing broken names to use sidecars when applicable

Copilot

Pull request overview

This PR introduces filename-shortening support for encrypted on-disk names by adding a configurable threshold, persisting it in vault configuration, and integrating shortening logic into the path/name helpers and several filesystem backends. It also wires the threshold into the UI (wizard + properties) and updates vault config MAC calculation to include the new field.

Changes:

Add ShorteningThreshold to vault/VFS option models and surface it in the vault creation wizard and vault properties view.
Implement shortened ciphertext names using deterministic hashes plus .sffsn and sidecar files (.sffsi) to store the full ciphertext name; update core file operations to use “discovery” vs “materialized” name encryption.
Update vault config reading/writing helpers and include ShorteningThreshold in the V4 config MAC computation.

Reviewed changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/Shared/SecureFolderFS.Storage/VirtualFileSystem/VirtualFileSystemOptions.cs	Adds VFS-level `ShorteningThreshold` option and dictionary mapping.
src/Shared/SecureFolderFS.Shared/Models/VaultOptions.cs	Persists `ShorteningThreshold` in vault options model.
src/Sdk/SecureFolderFS.Sdk/ViewModels/Views/Wizard/CredentialsWizardViewModel.cs	Adds wizard field and clamps threshold into vault options.
src/Sdk/SecureFolderFS.Sdk/ViewModels/Views/Vault/VaultPropertiesViewModel.cs	Displays shortening threshold in properties when name encryption is enabled.
src/Platforms/SecureFolderFS.Uno/Views/VaultWizard/CredentialsWizardPage.xaml	Adds NumberBox UI for configuring shortening threshold.
src/Platforms/SecureFolderFS.Uno/Views/Vault/VaultPropertiesPage.xaml	Conditionally shows shortening threshold in vault properties UI.
src/Platforms/SecureFolderFS.UI/ServiceImplementation/VaultService.cs	Returns `ShorteningThreshold` from vault config in `GetVaultOptionsAsync`.
src/Platforms/SecureFolderFS.UI/ServiceImplementation/RecycleBinService.cs	Updates config write MAC path and config type usage while configuring recycle bin.
src/Core/SecureFolderFS.Core/VaultAccess/VaultWriter.cs	Makes `WriteConfigurationAsync` generic (additional config type support).
src/Core/SecureFolderFS.Core/VaultAccess/VaultReader.cs	Adds V4-typed convenience reads and a generic config read API.
src/Core/SecureFolderFS.Core/VaultAccess/VaultParser.cs	Extends V4 config MAC input with `ShorteningThreshold` and changes authenticated fields.
src/Core/SecureFolderFS.Core/Routines/Operational/UnlockRoutine.cs	Switches to new V4-typed VaultReader APIs.
src/Core/SecureFolderFS.Core/Routines/Operational/RestoreRoutine.cs	Attempts to infer a shortening threshold during restore and writes it to config.
src/Core/SecureFolderFS.Core/Routines/Operational/RecoverRoutine.cs	Switches to new V4-typed VaultReader config API.
src/Core/SecureFolderFS.Core/Routines/Operational/ModifyCredentialsRoutine.cs	Switches to new V4-typed VaultReader keystore API.
src/Core/SecureFolderFS.Core/Routines/Operational/ModifyComplementationRoutine.cs	Switches to new V4-typed VaultReader APIs for config/keystore.
src/Core/SecureFolderFS.Core/Models/SecurityWrapper.cs	Exposes `ShorteningThreshold` into the VFS options contract.
src/Core/SecureFolderFS.Core/DataModels/V4VaultConfigurationDataModel.cs	Adds persisted `ShorteningThreshold` with JSON association.
src/Core/SecureFolderFS.Core/Constants.cs	Adds JSON association key for filename shortening.
src/Core/SecureFolderFS.Core.WinFsp/AppModels/WinFspOptions.cs	Plumbs `ShorteningThreshold` into WinFsp options mapping.
src/Core/SecureFolderFS.Core.WebDav/AppModels/WebDavOptions.cs	Plumbs `ShorteningThreshold` into WebDav options mapping.
src/Core/SecureFolderFS.Core.FUSE/AppModels/FuseOptions.cs	Plumbs `ShorteningThreshold` into FUSE options mapping.
src/Core/SecureFolderFS.Core.Dokany/AppModels/DokanyOptions.cs	Plumbs `ShorteningThreshold` into Dokany options mapping.
src/Core/SecureFolderFS.Core.FileSystem/Storage/CryptoFolder.cs	Uses “discovery” vs “use” encryption paths; attempts sidecar cleanup on rename/delete/move.
src/Core/SecureFolderFS.Core.FileSystem/Helpers/RecycleBin/Abstract/AbstractRecycleBinHelpers.Operational.cs	Uses discovery encryption for restore name checks.
src/Core/SecureFolderFS.Core.FileSystem/Helpers/Paths/PathHelpers.cs	Treats `.sffsi` sidecars as internal/core names.
src/Core/SecureFolderFS.Core.FileSystem/Helpers/Paths/Abstract/AbstractPathHelpers.Shortening.cs	Introduces sidecar + shortened-name helper logic.
src/Core/SecureFolderFS.Core.FileSystem/Helpers/Paths/Abstract/AbstractPathHelpers.Paths.cs	Switches path traversal to discovery encryption.
src/Core/SecureFolderFS.Core.FileSystem/Helpers/Paths/Abstract/AbstractPathHelpers.Names.cs	Adds “EncryptNameForUse/Discovery” and resolves shortened names via sidecars during decryption.
src/Core/SecureFolderFS.Core.FileSystem/Constants.cs	Defines new `.sffsn` (shortened) and `.sffsi` (sidecar) extensions.

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Copilot

Pull request overview

Copilot reviewed 39 out of 39 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 55 out of 55 changed files in this pull request and generated 5 comments.

+ private void Shortening_TextChanged(object? sender, TextChangedEventArgs e)
+ {
+ if (sender is not Entry entry)
+ return;
+
+ if (!int.TryParse(entry.Text, out var value))
+ value = 0;
+
+ value = Math.Max(0, Math.Min(value, 250));
+ entry.Text = value.ToString();
+ ViewModel.ShorteningThreshold = value;
+ }


Agent-Logs-Url: https://github.com/securefolderfs-community/SecureFolderFS/sessions/968f5df5-d3c9-4439-952b-bc291b08ad03 Co-authored-by: d2dyno1 <53011783+d2dyno1@users.noreply.github.com>

Copilot · 2026-05-26T17:11:24Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

crl.godaddy.com
- Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/SecureFolderFS/SecureFolderFS/src/Platforms/SecureFolderFS.Uno/SecureFolderFS.Uno.csproj --packages /tmp/codeql-scratch-d52628fd4f0752cc/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/tmp/codeql-scratch-d52628fd4f0752cc/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/tmp/codeql-scratch-d52628fd4f0752cc/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true -s REDACTED (dns block)
ocsp.godaddy.com
- Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/SecureFolderFS/SecureFolderFS/src/Platforms/SecureFolderFS.Uno/SecureFolderFS.Uno.csproj --packages /tmp/codeql-scratch-d52628fd4f0752cc/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/tmp/codeql-scratch-d52628fd4f0752cc/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/tmp/codeql-scratch-d52628fd4f0752cc/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true -s REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Begin work on shortening
9c791a5

d2dyno1 changed the base branch from master to f_vault4May 21, 2026 15:18

d2dyno1 mentioned this pull request May 21, 2026
Implemented Vault V4 #106
Draft
8 tasks

d2dyno1 added 2 commits May 22, 2026 14:58

Added name shortening vault option
a25e59d

Implement shortening for CryptoFolder
dc85c4c

d2dyno1 requested a review from Copilot May 22, 2026 17:42

Copilotstarted reviewing on behalf of d2dyno1 May 22, 2026 17:42 View session

CopilotAI reviewed May 22, 2026
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d2dyno1 added 4 commits May 22, 2026 19:53

Apply partial code review
97c339a

Fix Recycle Bin restore with sidecar names
240e023

Fixed threshold detection in RestoreRoutine
071f0c6

Detect orphan sidecar files in vault health
94e810f

d2dyno1 requested a review from Copilot May 25, 2026 18:17

Copilotstarted reviewing on behalf of d2dyno1 May 25, 2026 18:17 View session

CopilotAI reviewed May 25, 2026
View reviewed changes

Comment threadsrc/Core/SecureFolderFS.Core/DataModels/V4VaultConfigurationDataModel.cs
Comment threadsrc/Core/SecureFolderFS.Core.FileSystem/Helpers/Health/HealthHelpers.Sidecar.cs Outdated

d2dyno1 added 5 commits May 26, 2026 00:42

Apply code review
f8a398e

Implemented sidecar logic for Dokany and WinFsp
c28b045

Added shortening and recycle bin support to FUSE
23a13d6

Added name shortening to MAUI
320818f

Update MockVaultHelpers.V4.cs
2d5b5b4

d2dyno1 marked this pull request as ready for review May 26, 2026 14:48

d2dyno1 requested a review from Copilot May 26, 2026 14:48

Copilotstarted reviewing on behalf of d2dyno1 May 26, 2026 14:49 View session

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View reviewed changes

Copilotstarted work on behalf of d2dyno1 May 26, 2026 17:05 View session

fix: detect shortened directories during restore finalization
4cf01a3
Agent-Logs-Url: https://github.com/securefolderfs-community/SecureFolderFS/sessions/968f5df5-d3c9-4439-952b-bc291b08ad03 Co-authored-by: d2dyno1 <53011783+d2dyno1@users.noreply.github.com>

Copilotfinished work on behalf of d2dyno1 May 26, 2026 17:11

Apply code review
e9be5a1

d2dyno1 added the approved The pull request has been reviewed and approved label May 26, 2026

d2dyno1 merged commit fdf95a4 into f_vault4May 26, 2026
13 checks passed

d2dyno1 deleted the f_shortening branch May 26, 2026 17:17

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Implemented file name shortening - #129

Implemented file name shortening#129
d2dyno1 merged 14 commits into
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d2dyno1 commented May 21, 2026•
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CopilotAI commented May 26, 2026

I tried to connect to the following addresses, but was blocked by firewall rules:

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CopilotAI commented May 26, 2026

I tried to connect to the following addresses, but was blocked by firewall rules:

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d2dyno1 commented May 21, 2026•
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