Merge pull request #17 from JustEnoughVCS/jvcs_dev

Jvcs dev

4 files changed, 958 insertions, 0 deletions

diff --git a/crates/vcs_data/src/data/vault/config.rs b/crates/vcs_data/src/data/vault/config.rs
new file mode 100644
index 0000000..6eea25a
--- /dev/null
+++ b/crates/vcs_data/src/data/vault/config.rs
@@ -0,0 +1,77 @@
+use std::net::{IpAddr, Ipv4Addr};
+
+use cfg_file::ConfigFile;
+use serde::{Deserialize, Serialize};
+
+use crate::constants::{PORT, SERVER_FILE_VAULT};
+use crate::data::member::{Member, MemberId};
+
+#[derive(Serialize, Deserialize, ConfigFile)]
+#[cfg_file(path = SERVER_FILE_VAULT)]
+pub struct VaultConfig {
+    /// Vault name, which can be used as the project name and generally serves as a hint
+    vault_name: String,
+
+    /// Vault admin id, a list of member id representing administrator identities
+    vault_admin_list: Vec<MemberId>,
+
+    /// Vault server configuration, which will be loaded when connecting to the server
+    server_config: VaultServerConfig,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct VaultServerConfig {
+    /// Local IP address to bind to when the server starts
+    local_bind: IpAddr,
+
+    /// TCP port to bind to when the server starts
+    port: u16,
+
+    /// Whether to enable LAN discovery, allowing members on the same LAN to more easily find the upstream server
+    lan_discovery: bool, // TODO
+
+    /// Authentication strength level
+    /// 0: Weakest - Anyone can claim any identity, fastest speed
+    /// 1: Basic - Any device can claim any registered identity, slightly faster
+    /// 2: Advanced - Uses asymmetric encryption, multiple devices can use key authentication to log in simultaneously, slightly slower
+    /// 3: Secure - Uses asymmetric encryption, only one device can use key for authentication at a time, much slower
+    /// Default is "Advanced", if using a lower security policy, ensure your server is only accessible by trusted devices
+    auth_strength: u8, // TODO
+}
+
+impl Default for VaultConfig {
+    fn default() -> Self {
+        Self {
+            vault_name: "JustEnoughVault".to_string(),
+            vault_admin_list: Vec::new(),
+            server_config: VaultServerConfig {
+                local_bind: IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
+                port: PORT,
+                lan_discovery: false,
+                auth_strength: 2,
+            },
+        }
+    }
+}
+
+/// Vault Management
+impl VaultConfig {
+    // Change name of the vault.
+    pub fn change_name(&mut self, name: impl Into<String>) {
+        self.vault_name = name.into()
+    }
+
+    // Add admin
+    pub fn add_admin(&mut self, member: &Member) {
+        let uuid = member.id();
+        if !self.vault_admin_list.contains(&uuid) {
+            self.vault_admin_list.push(uuid);
+        }
+    }
+
+    // Remove admin
+    pub fn remove_admin(&mut self, member: &Member) {
+        let id = member.id();
+        self.vault_admin_list.retain(|x| x != &id);
+    }
+}
diff --git a/crates/vcs_data/src/data/vault/member.rs b/crates/vcs_data/src/data/vault/member.rs
new file mode 100644
index 0000000..aebd92d
--- /dev/null
+++ b/crates/vcs_data/src/data/vault/member.rs
@@ -0,0 +1,140 @@
+use std::{
+    fs,
+    io::{Error, ErrorKind},
+    path::PathBuf,
+};
+
+use cfg_file::config::ConfigFile;
+
+use crate::{
+    constants::{SERVER_FILE_MEMBER_INFO, SERVER_FILE_MEMBER_PUB, SERVER_PATH_MEMBERS},
+    data::{
+        member::{Member, MemberId},
+        vault::Vault,
+    },
+};
+
+const ID_PARAM: &str = "{member_id}";
+
+/// Member Manage
+impl Vault {
+    /// Read member from configuration file
+    pub async fn member(&self, id: &MemberId) -> Result<Member, std::io::Error> {
+        if let Some(cfg_file) = self.member_cfg(id) {
+            let member = Member::read_from(cfg_file).await?;
+            return Ok(member);
+        }
+
+        Err(Error::new(ErrorKind::NotFound, "Member not found!"))
+    }
+
+    /// List all member IDs in the vault
+    pub fn member_ids(&self) -> Result<Vec<MemberId>, std::io::Error> {
+        let members_path = self.vault_path.join(SERVER_PATH_MEMBERS);
+
+        if !members_path.exists() {
+            return Ok(Vec::new());
+        }
+
+        let mut member_ids = Vec::new();
+
+        for entry in fs::read_dir(members_path)? {
+            let entry = entry?;
+            let path = entry.path();
+
+            if path.is_file()
+                && let Some(file_name) = path.file_stem().and_then(|s| s.to_str())
+                && path.extension().and_then(|s| s.to_str()) == Some("toml")
+            {
+                member_ids.push(file_name.to_string());
+            }
+        }
+
+        Ok(member_ids)
+    }
+
+    /// Get all members
+    /// This method will read and deserialize member information, please pay attention to performance issues
+    pub async fn members(&self) -> Result<Vec<Member>, std::io::Error> {
+        let mut members = Vec::new();
+
+        for member_id in self.member_ids()? {
+            if let Ok(member) = self.member(&member_id).await {
+                members.push(member);
+            }
+        }
+
+        Ok(members)
+    }
+
+    /// Update member info
+    pub async fn update_member(&self, member: Member) -> Result<(), std::io::Error> {
+        // Ensure member exist
+        if self.member_cfg(&member.id()).is_some() {
+            let member_cfg_path = self.member_cfg_path(&member.id());
+            Member::write_to(&member, member_cfg_path).await?;
+            return Ok(());
+        }
+
+        Err(Error::new(ErrorKind::NotFound, "Member not found!"))
+    }
+
+    /// Register a member to vault
+    pub async fn register_member_to_vault(&self, member: Member) -> Result<(), std::io::Error> {
+        // Ensure member not exist
+        if self.member_cfg(&member.id()).is_some() {
+            return Err(Error::new(
+                ErrorKind::DirectoryNotEmpty,
+                format!("Member `{}` already registered!", member.id()),
+            ));
+        }
+
+        // Wrtie config file to member dir
+        let member_cfg_path = self.member_cfg_path(&member.id());
+        Member::write_to(&member, member_cfg_path).await?;
+
+        Ok(())
+    }
+
+    /// Remove member from vault
+    pub fn remove_member_from_vault(&self, id: &MemberId) -> Result<(), std::io::Error> {
+        // Ensure member exist
+        if let Some(member_cfg_path) = self.member_cfg(id) {
+            fs::remove_file(member_cfg_path)?;
+        }
+
+        Ok(())
+    }
+
+    /// Try to get the member's configuration file to determine if the member exists
+    pub fn member_cfg(&self, id: &MemberId) -> Option<PathBuf> {
+        let cfg_file = self.member_cfg_path(id);
+        if cfg_file.exists() {
+            Some(cfg_file)
+        } else {
+            None
+        }
+    }
+
+    /// Try to get the member's public key file to determine if the member has login permission
+    pub fn member_key(&self, id: &MemberId) -> Option<PathBuf> {
+        let key_file = self.member_key_path(id);
+        if key_file.exists() {
+            Some(key_file)
+        } else {
+            None
+        }
+    }
+
+    /// Get the member's configuration file path, but do not check if the file exists
+    pub fn member_cfg_path(&self, id: &MemberId) -> PathBuf {
+        self.vault_path
+            .join(SERVER_FILE_MEMBER_INFO.replace(ID_PARAM, id.to_string().as_str()))
+    }
+
+    /// Get the member's public key file path, but do not check if the file exists
+    pub fn member_key_path(&self, id: &MemberId) -> PathBuf {
+        self.vault_path
+            .join(SERVER_FILE_MEMBER_PUB.replace(ID_PARAM, id.to_string().as_str()))
+    }
+}
diff --git a/crates/vcs_data/src/data/vault/sheets.rs b/crates/vcs_data/src/data/vault/sheets.rs
new file mode 100644
index 0000000..0bba4f5
--- /dev/null
+++ b/crates/vcs_data/src/data/vault/sheets.rs
@@ -0,0 +1,268 @@
+use std::{collections::HashMap, io::Error};
+
+use cfg_file::config::ConfigFile;
+use string_proc::snake_case;
+use tokio::fs;
+
+use crate::{
+    constants::SERVER_PATH_SHEETS,
+    data::{
+        member::MemberId,
+        sheet::{Sheet, SheetData, SheetName},
+        vault::Vault,
+    },
+};
+
+/// Vault Sheets Management
+impl Vault {
+    /// Load all sheets in the vault
+    ///
+    /// It is generally not recommended to call this function frequently.
+    /// Although a vault typically won't contain too many sheets,
+    /// if individual sheet contents are large, this operation may cause
+    /// significant performance bottlenecks.
+    pub async fn sheets<'a>(&'a self) -> Result<Vec<Sheet<'a>>, std::io::Error> {
+        let sheet_names = self.sheet_names()?;
+        let mut sheets = Vec::new();
+
+        for sheet_name in sheet_names {
+            let sheet = self.sheet(&sheet_name).await?;
+            sheets.push(sheet);
+        }
+
+        Ok(sheets)
+    }
+
+    /// Search for all sheet names in the vault
+    ///
+    /// The complexity of this operation is proportional to the number of sheets,
+    /// but generally there won't be too many sheets in a Vault
+    pub fn sheet_names(&self) -> Result<Vec<SheetName>, std::io::Error> {
+        // Get the sheets directory path
+        let sheets_dir = self.vault_path.join(SERVER_PATH_SHEETS);
+
+        // If the directory doesn't exist, return an empty list
+        if !sheets_dir.exists() {
+            return Ok(vec![]);
+        }
+
+        let mut sheet_names = Vec::new();
+
+        // Iterate through all files in the sheets directory
+        for entry in std::fs::read_dir(sheets_dir)? {
+            let entry = entry?;
+            let path = entry.path();
+
+            // Check if it's a YAML file
+            if path.is_file()
+                && path.extension().is_some_and(|ext| ext == "yaml")
+                && let Some(file_stem) = path.file_stem().and_then(|s| s.to_str())
+            {
+                // Create a new SheetName and add it to the result list
+                sheet_names.push(file_stem.to_string());
+            }
+        }
+
+        Ok(sheet_names)
+    }
+
+    /// Read a sheet from its name
+    ///
+    /// If the sheet information is successfully found in the vault,
+    /// it will be deserialized and read as a sheet.
+    /// This is the only correct way to obtain a sheet instance.
+    pub async fn sheet<'a>(&'a self, sheet_name: &SheetName) -> Result<Sheet<'a>, std::io::Error> {
+        let sheet_name = snake_case!(sheet_name.clone());
+
+        // Get the path to the sheet file
+        let sheet_path = Sheet::sheet_path_with_name(self, &sheet_name);
+
+        // Ensure the sheet file exists
+        if !sheet_path.exists() {
+            // If the sheet does not exist, try to restore it from the trash
+            if self.restore_sheet(&sheet_name).await.is_err() {
+                // If restoration fails, return an error
+                return Err(Error::new(
+                    std::io::ErrorKind::NotFound,
+                    format!("Sheet `{}` not found!", sheet_name),
+                ));
+            }
+        }
+
+        // Read the sheet data from the file
+        let data = SheetData::read_from(sheet_path).await?;
+
+        Ok(Sheet {
+            name: sheet_name.clone(),
+            data,
+            vault_reference: self,
+        })
+    }
+
+    /// Create a sheet locally and return the sheet instance
+    ///
+    /// This method creates a new sheet in the vault with the given name and holder.
+    /// It will verify that the member exists and that the sheet doesn't already exist
+    /// before creating the sheet file with default empty data.
+    pub async fn create_sheet<'a>(
+        &'a self,
+        sheet_name: &SheetName,
+        holder: &MemberId,
+    ) -> Result<Sheet<'a>, std::io::Error> {
+        let sheet_name = snake_case!(sheet_name.clone());
+
+        // Ensure member exists
+        if !self.member_cfg_path(holder).exists() {
+            return Err(Error::new(
+                std::io::ErrorKind::NotFound,
+                format!("Member `{}` not found!", &holder),
+            ));
+        }
+
+        // Ensure sheet does not already exist
+        let sheet_file_path = Sheet::sheet_path_with_name(self, &sheet_name);
+        if sheet_file_path.exists() {
+            return Err(Error::new(
+                std::io::ErrorKind::AlreadyExists,
+                format!("Sheet `{}` already exists!", &sheet_name),
+            ));
+        }
+
+        // Create the sheet file
+        let sheet_data = SheetData {
+            holder: holder.clone(),
+            inputs: Vec::new(),
+            mapping: HashMap::new(),
+        };
+        SheetData::write_to(&sheet_data, sheet_file_path).await?;
+
+        Ok(Sheet {
+            name: sheet_name,
+            data: sheet_data,
+            vault_reference: self,
+        })
+    }
+
+    /// Delete the sheet file from local disk by name
+    ///
+    /// This method will remove the sheet file with the given name from the vault.
+    /// It will verify that the sheet exists before attempting to delete it.
+    /// If the sheet is successfully deleted, it will return Ok(()).
+    ///
+    /// Warning: This operation is dangerous. Deleting a sheet will cause local workspaces
+    /// using this sheet to become invalid. Please ensure the sheet is not currently in use
+    /// and will not be used in the future.
+    ///
+    /// For a safer deletion method, consider using `delete_sheet_safety`.
+    ///
+    /// Note: This function is intended for server-side use only and should not be
+    /// arbitrarily called by other members to prevent unauthorized data deletion.
+    pub async fn delete_sheet(&self, sheet_name: &SheetName) -> Result<(), std::io::Error> {
+        let sheet_name = snake_case!(sheet_name.clone());
+
+        // Ensure sheet exists
+        let sheet_file_path = Sheet::sheet_path_with_name(self, &sheet_name);
+        if !sheet_file_path.exists() {
+            return Err(Error::new(
+                std::io::ErrorKind::NotFound,
+                format!("Sheet `{}` not found!", &sheet_name),
+            ));
+        }
+
+        // Delete the sheet file
+        fs::remove_file(sheet_file_path).await?;
+
+        Ok(())
+    }
+
+    /// Safely delete the sheet
+    ///
+    /// The sheet will be moved to the trash directory, ensuring it does not appear in the
+    /// results of `sheets` and `sheet_names` methods.
+    /// However, if the sheet's holder attempts to access the sheet through the `sheet` method,
+    /// the system will automatically restore it from the trash directory.
+    /// This means: the sheet will only permanently remain in the trash directory,
+    /// waiting for manual cleanup by an administrator, when it is truly no longer in use.
+    ///
+    /// This is a safer deletion method because it provides the possibility of recovery,
+    /// avoiding irreversible data loss caused by accidental deletion.
+    ///
+    /// Note: This function is intended for server-side use only and should not be
+    /// arbitrarily called by other members to prevent unauthorized data deletion.
+    pub async fn delete_sheet_safely(&self, sheet_name: &SheetName) -> Result<(), std::io::Error> {
+        let sheet_name = snake_case!(sheet_name.clone());
+
+        // Ensure the sheet exists
+        let sheet_file_path = Sheet::sheet_path_with_name(self, &sheet_name);
+        if !sheet_file_path.exists() {
+            return Err(Error::new(
+                std::io::ErrorKind::NotFound,
+                format!("Sheet `{}` not found!", &sheet_name),
+            ));
+        }
+
+        // Create the trash directory
+        let trash_dir = self.vault_path.join(".trash");
+        if !trash_dir.exists() {
+            fs::create_dir_all(&trash_dir).await?;
+        }
+
+        // Generate a unique filename in the trash
+        let timestamp = std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .unwrap()
+            .as_millis();
+        let trash_file_name = format!("{}_{}.yaml", sheet_name, timestamp);
+        let trash_path = trash_dir.join(trash_file_name);
+
+        // Move the sheet file to the trash
+        fs::rename(&sheet_file_path, &trash_path).await?;
+
+        Ok(())
+    }
+
+    /// Restore the sheet from the trash
+    ///
+    /// Restore the specified sheet from the trash to its original location, making it accessible normally.
+    pub async fn restore_sheet(&self, sheet_name: &SheetName) -> Result<(), std::io::Error> {
+        let sheet_name = snake_case!(sheet_name.clone());
+
+        // Search for matching files in the trash
+        let trash_dir = self.vault_path.join(".trash");
+        if !trash_dir.exists() {
+            return Err(Error::new(
+                std::io::ErrorKind::NotFound,
+                "Trash directory does not exist!".to_string(),
+            ));
+        }
+
+        let mut found_path = None;
+        for entry in std::fs::read_dir(&trash_dir)? {
+            let entry = entry?;
+            let path = entry.path();
+
+            if path.is_file()
+                && let Some(file_name) = path.file_stem().and_then(|s| s.to_str())
+            {
+                // Check if the filename starts with the sheet name
+                if file_name.starts_with(&sheet_name) {
+                    found_path = Some(path);
+                    break;
+                }
+            }
+        }
+
+        let trash_path = found_path.ok_or_else(|| {
+            Error::new(
+                std::io::ErrorKind::NotFound,
+                format!("Sheet `{}` not found in trash!", &sheet_name),
+            )
+        })?;
+
+        // Restore the sheet to its original location
+        let original_path = Sheet::sheet_path_with_name(self, &sheet_name);
+        fs::rename(&trash_path, &original_path).await?;
+
+        Ok(())
+    }
+}
diff --git a/crates/vcs_data/src/data/vault/virtual_file.rs b/crates/vcs_data/src/data/vault/virtual_file.rs
new file mode 100644
index 0000000..fe83594
--- /dev/null
+++ b/crates/vcs_data/src/data/vault/virtual_file.rs
@@ -0,0 +1,473 @@
+use std::{
+    collections::HashMap,
+    io::{Error, ErrorKind},
+    path::PathBuf,
+};
+
+use cfg_file::{ConfigFile, config::ConfigFile};
+use serde::{Deserialize, Serialize};
+use string_proc::snake_case;
+use tcp_connection::instance::ConnectionInstance;
+use tokio::fs;
+use uuid::Uuid;
+
+use crate::{
+    constants::{
+        SERVER_FILE_VF_META, SERVER_FILE_VF_VERSION_INSTANCE, SERVER_PATH_VF_ROOT,
+        SERVER_PATH_VF_STORAGE, SERVER_PATH_VF_TEMP,
+    },
+    data::{member::MemberId, vault::Vault},
+};
+
+pub type VirtualFileId = String;
+pub type VirtualFileVersion = String;
+
+const VF_PREFIX: &str = "vf_";
+const ID_PARAM: &str = "{vf_id}";
+const ID_INDEX: &str = "{vf_index}";
+const VERSION_PARAM: &str = "{vf_version}";
+const TEMP_NAME: &str = "{temp_name}";
+
+pub struct VirtualFile<'a> {
+    /// Unique identifier for the virtual file
+    id: VirtualFileId,
+
+    /// Reference of Vault
+    current_vault: &'a Vault,
+}
+
+#[derive(Default, Clone, Serialize, Deserialize, ConfigFile)]
+pub struct VirtualFileMeta {
+    /// Current version of the virtual file
+    current_version: VirtualFileVersion,
+
+    /// The member who holds the edit right of the file
+    hold_member: MemberId,
+
+    /// Description of each version
+    version_description: HashMap<VirtualFileVersion, VirtualFileVersionDescription>,
+
+    /// Histories
+    histories: Vec<VirtualFileVersion>,
+}
+
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub struct VirtualFileVersionDescription {
+    /// The member who created this version
+    pub creator: MemberId,
+
+    /// The description of this version
+    pub description: String,
+}
+
+impl VirtualFileVersionDescription {
+    /// Create a new version description
+    pub fn new(creator: MemberId, description: String) -> Self {
+        Self {
+            creator,
+            description,
+        }
+    }
+}
+
+/// Virtual File Operations
+impl Vault {
+    /// Generate a temporary path for receiving
+    pub fn virtual_file_temp_path(&self) -> PathBuf {
+        let random_receive_name = format!("{}", uuid::Uuid::new_v4());
+        self.vault_path
+            .join(SERVER_PATH_VF_TEMP.replace(TEMP_NAME, &random_receive_name))
+    }
+
+    /// Get the directory where virtual files are stored
+    pub fn virtual_file_storage_dir(&self) -> PathBuf {
+        self.vault_path().join(SERVER_PATH_VF_ROOT)
+    }
+
+    /// Get the directory where a specific virtual file is stored
+    pub fn virtual_file_dir(&self, id: &VirtualFileId) -> Result<PathBuf, std::io::Error> {
+        Ok(self.vault_path().join(
+            SERVER_PATH_VF_STORAGE
+                .replace(ID_PARAM, &id.to_string())
+                .replace(ID_INDEX, &Self::vf_index(id)?),
+        ))
+    }
+
+    // Generate index path of virtual file
+    fn vf_index(id: &VirtualFileId) -> Result<String, std::io::Error> {
+        // Remove VF_PREFIX if present
+        let id_str = if let Some(stripped) = id.strip_prefix(VF_PREFIX) {
+            stripped
+        } else {
+            id
+        };
+
+        // Extract the first part before the first hyphen
+        let first_part = id_str.split('-').next().ok_or_else(|| {
+            std::io::Error::new(
+                std::io::ErrorKind::InvalidInput,
+                "Invalid virtual file ID format: no hyphen found",
+            )
+        })?;
+
+        // Ensure the first part has exactly 8 characters
+        if first_part.len() != 8 {
+            return Err(std::io::Error::new(
+                std::io::ErrorKind::InvalidInput,
+                "Invalid virtual file ID format: first part must be 8 characters",
+            ))?;
+        }
+
+        // Split into 2-character chunks and join with path separator
+        let mut path = String::new();
+        for i in (0..first_part.len()).step_by(2) {
+            if i > 0 {
+                path.push('/');
+            }
+            path.push_str(&first_part[i..i + 2]);
+        }
+
+        Ok(path)
+    }
+
+    /// Get the directory where a specific virtual file's metadata is stored
+    pub fn virtual_file_real_path(
+        &self,
+        id: &VirtualFileId,
+        version: &VirtualFileVersion,
+    ) -> PathBuf {
+        self.vault_path().join(
+            SERVER_FILE_VF_VERSION_INSTANCE
+                .replace(ID_PARAM, &id.to_string())
+                .replace(ID_INDEX, &Self::vf_index(id).unwrap_or_default())
+                .replace(VERSION_PARAM, &version.to_string()),
+        )
+    }
+
+    /// Get the directory where a specific virtual file's metadata is stored
+    pub fn virtual_file_meta_path(&self, id: &VirtualFileId) -> PathBuf {
+        self.vault_path().join(
+            SERVER_FILE_VF_META
+                .replace(ID_PARAM, &id.to_string())
+                .replace(ID_INDEX, &Self::vf_index(id).unwrap_or_default()),
+        )
+    }
+
+    /// Get the virtual file with the given ID
+    pub fn virtual_file(&self, id: &VirtualFileId) -> Result<VirtualFile<'_>, std::io::Error> {
+        let dir = self.virtual_file_dir(id);
+        if dir?.exists() {
+            Ok(VirtualFile {
+                id: id.clone(),
+                current_vault: self,
+            })
+        } else {
+            Err(std::io::Error::new(
+                std::io::ErrorKind::NotFound,
+                "Cannot found virtual file!",
+            ))
+        }
+    }
+
+    /// Get the meta data of the virtual file with the given ID
+    pub async fn virtual_file_meta(
+        &self,
+        id: &VirtualFileId,
+    ) -> Result<VirtualFileMeta, std::io::Error> {
+        let dir = self.virtual_file_meta_path(id);
+        let metadata = VirtualFileMeta::read_from(dir).await?;
+        Ok(metadata)
+    }
+
+    /// Write the meta data of the virtual file with the given ID
+    pub async fn write_virtual_file_meta(
+        &self,
+        id: &VirtualFileId,
+        meta: &VirtualFileMeta,
+    ) -> Result<(), std::io::Error> {
+        let dir = self.virtual_file_meta_path(id);
+        VirtualFileMeta::write_to(meta, dir).await?;
+        Ok(())
+    }
+
+    /// Create a virtual file from a connection instance
+    ///
+    /// It's the only way to create virtual files!
+    ///
+    /// When the target machine executes `write_file`, use this function instead of `read_file`,
+    ///    and provide the member ID of the transmitting member.
+    ///
+    /// The system will automatically receive the file and
+    ///    create the virtual file.
+    pub async fn create_virtual_file_from_connection(
+        &self,
+        instance: &mut ConnectionInstance,
+        member_id: &MemberId,
+    ) -> Result<VirtualFileId, std::io::Error> {
+        const FIRST_VERSION: &str = "0";
+        let receive_path = self.virtual_file_temp_path();
+        let new_id = format!("{}{}", VF_PREFIX, Uuid::new_v4());
+        let move_path = self.virtual_file_real_path(&new_id, &FIRST_VERSION.to_string());
+
+        match instance.read_file(receive_path.clone()).await {
+            Ok(_) => {
+                // Read successful, create virtual file
+                // Create default version description
+                let mut version_description =
+                    HashMap::<VirtualFileVersion, VirtualFileVersionDescription>::new();
+                version_description.insert(
+                    FIRST_VERSION.to_string(),
+                    VirtualFileVersionDescription {
+                        creator: member_id.clone(),
+                        description: "Track".to_string(),
+                    },
+                );
+                // Create metadata
+                let mut meta = VirtualFileMeta {
+                    current_version: FIRST_VERSION.to_string(),
+                    hold_member: member_id.clone(), // The holder of the newly created virtual file is the creator by default
+                    version_description,
+                    histories: Vec::default(),
+                };
+
+                // Add first version
+                meta.histories.push(FIRST_VERSION.to_string());
+
+                // Write metadata to file
+                VirtualFileMeta::write_to(&meta, self.virtual_file_meta_path(&new_id)).await?;
+
+                // Move temp file to virtual file directory
+                if let Some(parent) = move_path.parent()
+                    && !parent.exists()
+                {
+                    fs::create_dir_all(parent).await?;
+                }
+                fs::rename(receive_path, move_path).await?;
+
+                //
+
+                Ok(new_id)
+            }
+            Err(e) => {
+                // Read failed, remove temp file.
+                if receive_path.exists() {
+                    fs::remove_file(receive_path).await?;
+                }
+
+                Err(Error::other(e))
+            }
+        }
+    }
+
+    /// Update a virtual file from a connection instance
+    ///
+    /// It's the only way to update virtual files!
+    /// When the target machine executes `write_file`, use this function instead of `read_file`,
+    ///    and provide the member ID of the transmitting member.
+    ///
+    /// The system will automatically receive the file and
+    ///    update the virtual file.
+    ///
+    /// Note: The specified member must hold the edit right of the file,
+    ///    otherwise the file reception will not be allowed.
+    ///
+    /// Make sure to obtain the edit right of the file before calling this function.
+    pub async fn update_virtual_file_from_connection(
+        &self,
+        instance: &mut ConnectionInstance,
+        member: &MemberId,
+        virtual_file_id: &VirtualFileId,
+        new_version: &VirtualFileVersion,
+        description: VirtualFileVersionDescription,
+    ) -> Result<(), std::io::Error> {
+        let new_version = snake_case!(new_version.clone());
+        let mut meta = self.virtual_file_meta(virtual_file_id).await?;
+
+        // Check if the member has edit right
+        self.check_virtual_file_edit_right(member, virtual_file_id)
+            .await?;
+
+        // Check if the new version already exists
+        if meta.version_description.contains_key(&new_version) {
+            return Err(Error::new(
+                ErrorKind::AlreadyExists,
+                format!(
+                    "Version `{}` already exists for virtual file `{}`",
+                    new_version, virtual_file_id
+                ),
+            ));
+        }
+
+        // Verify success
+        let receive_path = self.virtual_file_temp_path();
+        let move_path = self.virtual_file_real_path(virtual_file_id, &new_version);
+
+        match instance.read_file(receive_path.clone()).await {
+            Ok(_) => {
+                // Read success, move temp file to real path.
+                fs::rename(receive_path, move_path).await?;
+
+                // Update metadata
+                meta.current_version = new_version.clone();
+                meta.version_description
+                    .insert(new_version.clone(), description);
+                meta.histories.push(new_version);
+                VirtualFileMeta::write_to(&meta, self.virtual_file_meta_path(virtual_file_id))
+                    .await?;
+
+                Ok(())
+            }
+            Err(e) => {
+                // Read failed, remove temp file.
+                if receive_path.exists() {
+                    fs::remove_file(receive_path).await?;
+                }
+
+                Err(Error::other(e))
+            }
+        }
+    }
+
+    /// Update virtual file from existing version
+    ///
+    /// This operation creates a new version based on the specified old version file instance.
+    /// The new version will retain the same version name as the old version, but use a different version number.
+    /// After the update, this version will be considered newer than the original version when comparing versions.
+    pub async fn update_virtual_file_from_exist_version(
+        &self,
+        member: &MemberId,
+        virtual_file_id: &VirtualFileId,
+        old_version: &VirtualFileVersion,
+    ) -> Result<(), std::io::Error> {
+        let old_version = snake_case!(old_version.clone());
+        let mut meta = self.virtual_file_meta(virtual_file_id).await?;
+
+        // Check if the member has edit right
+        self.check_virtual_file_edit_right(member, virtual_file_id)
+            .await?;
+
+        // Ensure virtual file exist
+        let Ok(_) = self.virtual_file(virtual_file_id) else {
+            return Err(Error::new(
+                ErrorKind::NotFound,
+                format!("Virtual file `{}` not found!", virtual_file_id),
+            ));
+        };
+
+        // Ensure version exist
+        if !meta.version_exists(&old_version) {
+            return Err(Error::new(
+                ErrorKind::NotFound,
+                format!("Version `{}` not found!", old_version),
+            ));
+        }
+
+        // Ok, Create new version
+        meta.current_version = old_version.clone();
+        meta.histories.push(old_version);
+        VirtualFileMeta::write_to(&meta, self.virtual_file_meta_path(virtual_file_id)).await?;
+
+        Ok(())
+    }
+
+    /// Grant a member the edit right for a virtual file
+    /// This operation takes effect immediately upon success
+    pub async fn grant_virtual_file_edit_right(
+        &self,
+        member_id: &MemberId,
+        virtual_file_id: &VirtualFileId,
+    ) -> Result<(), std::io::Error> {
+        let mut meta = self.virtual_file_meta(virtual_file_id).await?;
+        meta.hold_member = member_id.clone();
+        self.write_virtual_file_meta(virtual_file_id, &meta).await
+    }
+
+    /// Check if a member has the edit right for a virtual file
+    pub async fn has_virtual_file_edit_right(
+        &self,
+        member_id: &MemberId,
+        virtual_file_id: &VirtualFileId,
+    ) -> Result<bool, std::io::Error> {
+        let meta = self.virtual_file_meta(virtual_file_id).await?;
+        Ok(meta.hold_member.eq(member_id))
+    }
+
+    /// Check if a member has the edit right for a virtual file and return Result
+    /// Returns Ok(()) if the member has edit right, otherwise returns PermissionDenied error
+    pub async fn check_virtual_file_edit_right(
+        &self,
+        member_id: &MemberId,
+        virtual_file_id: &VirtualFileId,
+    ) -> Result<(), std::io::Error> {
+        if !self
+            .has_virtual_file_edit_right(member_id, virtual_file_id)
+            .await?
+        {
+            return Err(Error::new(
+                ErrorKind::PermissionDenied,
+                format!(
+                    "Member `{}` not allowed to update virtual file `{}`",
+                    member_id, virtual_file_id
+                ),
+            ));
+        }
+        Ok(())
+    }
+
+    /// Revoke the edit right for a virtual file from the current holder
+    /// This operation takes effect immediately upon success
+    pub async fn revoke_virtual_file_edit_right(
+        &self,
+        virtual_file_id: &VirtualFileId,
+    ) -> Result<(), std::io::Error> {
+        let mut meta = self.virtual_file_meta(virtual_file_id).await?;
+        meta.hold_member = String::default();
+        self.write_virtual_file_meta(virtual_file_id, &meta).await
+    }
+}
+
+impl<'a> VirtualFile<'a> {
+    /// Get id of VirtualFile
+    pub fn id(&self) -> VirtualFileId {
+        self.id.clone()
+    }
+
+    /// Read metadata of VirtualFile
+    pub async fn read_meta(&self) -> Result<VirtualFileMeta, std::io::Error> {
+        self.current_vault.virtual_file_meta(&self.id).await
+    }
+}
+
+impl VirtualFileMeta {
+    /// Get all versions of the virtual file
+    pub fn versions(&self) -> &Vec<VirtualFileVersion> {
+        &self.histories
+    }
+
+    /// Get the total number of versions for this virtual file
+    pub fn version_len(&self) -> i32 {
+        self.histories.len() as i32
+    }
+
+    /// Check if a specific version exists
+    /// Returns true if the version exists, false otherwise
+    pub fn version_exists(&self, version: &VirtualFileVersion) -> bool {
+        self.versions().iter().any(|v| v == version)
+    }
+
+    /// Get the version number (index) for a given version name
+    /// Returns None if the version doesn't exist
+    pub fn version_num(&self, version: &VirtualFileVersion) -> Option<i32> {
+        self.histories
+            .iter()
+            .rev()
+            .position(|v| v == version)
+            .map(|pos| (self.histories.len() - 1 - pos) as i32)
+    }
+
+    /// Get the version name for a given version number (index)
+    /// Returns None if the version number is out of range
+    pub fn version_name(&self, version_num: i32) -> Option<VirtualFileVersion> {
+        self.histories.get(version_num as usize).cloned()
+    }
+}