ToolFetcher

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A tool for fetching DFIR and other GitHub tools.

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# ToolFetcher (v2.1.2)

ToolFetcher is a PowerShell tool designed to fetch and manage a collection of DFIR and other GitHub tools. It streamlines the process of downloading, extracting, and organizing forensic utilities from various sources—whether by cloning Git repositories, downloading the latest releases via the GitHub API, or pulling specific files directly.

## Features

- **Multiple Download Methods:**  
  Supports various methods including:
  - `gitClone` – Downloads a repository using GitHub API (no Git dependency)
  - `latestRelease` – Downloads the latest release assets via the GitHub API
  - `branchZip` – Downloads a branch ZIP archive (without the `.git` folder)
  - `specificFile` – Downloads a specific file directly

- **Automated Extraction & Management:**  
  - Automatically extracts ZIP archives when applicable
  - Creates `.downloaded.json` marker files to track managed files
  - Preserves user modifications during updates
  - Supports force re-download with complete directory overwrite

- **External YAML Configuration:**  
  ToolFetcher loads its tool configuration from an external YAML file that supports:
  - Multiple download methods
  - Custom output folders
  - Asset type filtering (win64, win32, linux64, linux32, macos64, macos32, arm64, arm32)
  - Skip download options
  - Extraction control
  - Branch selection
  - Local or remote YAML file support

- **Enhanced Logging & Debugging:**  
  - Multiple log levels (Error, Warning, Info, Debug, Trace)
  - File logging with timestamps
  - Detailed debug output when enabled
  - Comprehensive error messages with troubleshooting guidance

- **GitHub Integration:**  
  - GitHub API rate limit handling
  - Secure token input options
  - PAT validation
  - Support for private repositories

## Requirements

- **PowerShell:** Version 5.1 or later (or PowerShell Core)
- **Internet Connection:** Required for downloading tools and GitHub API access
- **powershell-yaml Module:**  
  This module is required to parse the external YAML configuration file. The script automatically checks for and installs it if requested.

## Configuration & Parameters

ToolFetcher uses a parameter-based approach for flexibility. Key parameters include:

- **`-ToolsFile` (alias `-tf`):**  
  Specifies the YAML configuration file. This can be a local file or a URL.  
  *Default:* `"tools.yaml"`  
  If the specified file is not found or is unreachable, the script offers to use a default URL:  
  ```
  https://raw.githubusercontent.com/kev365/ToolFetcher/refs/heads/main/tools.yaml
  ```

- **`-ToolsDirectory` (alias `-td`):**  
  The directory where all downloaded tools will be stored.  
  *Example:* `C:\tools`

- **`-ForceDownload` (alias `-force`):**  
  Forces a complete re-download of a tool by overwriting its existing directory.
  When used with `-UpdateAll`, it will update all downloaded tools, bypassing the skipdownload setting.

- **`-UpdateAll` (alias `-upall`):**  
  Updates all previously downloaded tools that have downloads enabled (skipdownload: false).
  Updates preserve user modifications by only removing managed files (tracked in .downloaded.json).

- **`-UpdateTools` (alias `-uptool`):**  
  Specify tool names to update (comma-separated). If a tool is not already downloaded, it will be downloaded.
  Updates preserve user modifications by only removing managed files (tracked in .downloaded.json).

- **`-VerboseOutput` (alias `-vo`):**  
  Enables detailed debug output for troubleshooting.

- **`-TraceOutput` (alias `-to`):**  
  Enables very detailed trace information (most verbose).

- **`-Log` (alias `-l`):**  
  Enables logging to a file in the tools directory.

- **`-GitHubPAT` (alias `-pat`):**  
  Optionally provide your GitHub Personal Access Token to avoid API rate limits.

- **`-PromptForPAT` (alias `-ppat`):**  
  Securely prompt for GitHub Personal Access Token (recommended over -GitHubPAT).

- **`-ListTools` (alias `-list`):**  
  Lists all available tools in the configuration file.

## YAML Configuration

The YAML configuration file supports the following fields for each tool:

```yaml
Name: "ToolName"      # Tool identifier, also used to name the parent folder
RepoUrl: ""           # URL goes here
DownloadMethod: ""    # Options: gitClone | latestRelease | branchZip | specificFile
OutputFolder: ""      # Appends a subdirectory to $toolsFolder
Branch: ""            # Defaults to master if not provided, also checks main if master is not available
DownloadName: ""      # Used to download a particular file from the latestRelease
AssetFilename: ""     # Used to specify exact filename to download from latestRelease (supports regex)
AssetType: ""         # Options: win64 | win32 | linux64 | linux32 | macos64 | macos32 | arm64 | arm32
SpecificFilePath: ""  # Used with the 'specificFile' DownloadMethod to specify file path in repository
Extract: true         # Whether to extract the downloaded file (default: true)
SkipDownload: false   # Whether to skip downloading this tool (default: false)
```

## Usage Examples

1. **Basic Usage:**
   ```powershell
   .\ToolFetcher.ps1
   ```

2. **Custom Configuration:**
   ```powershell
   .\ToolFetcher.ps1 -tf "my_tools.yaml" -td "D:\DFIR\Tools"
   ```

3. **Update All Downloaded Tools:**
   ```powershell
   .\ToolFetcher.ps1 -upall
   
   .\ToolFetcher.ps1 -UpdateAll
   ```

4. **Update Specific Tools:**
   ```powershell
   # Comma-separated list with quotes
   .\ToolFetcher.ps1 -uptools "LECmd","JLECmd","KStrike"
   .\ToolFetcher.ps1 -UpdateTools "LECmd,JLECmd,KStrike"

# Multiple parameters
   .\ToolFetcher.ps1 -UpdateTools RustyUsn -UpdateTools KStrike

# Array syntax
   .\ToolFetcher.ps1 -UpdateTools @("RustyUsn","KStrike")
   ```

5. **Update All Tools (Bypass SkipDownload):**
   ```powershell
   .\ToolFetcher.ps1 -upall -force
   ```

6. **List Available Tools:**
   ```powershell
   .\ToolFetcher.ps1 -list
   ```

7. **Enable Logging:**
   ```powershell
   .\ToolFetcher.ps1 -l
   ```

8. **Use Remote Configuration:**
   ```powershell
   .\ToolFetcher.ps1 -tf "https://raw.githubusercontent.com/kev365/ToolFetcher/main/tools.yaml"
   ```

9. **Secure GitHub Token Input:**
   ```powershell
   .\ToolFetcher.ps1 -PromptForPAT
   ```

## Error Handling

ToolFetcher provides comprehensive error handling and user guidance:

- YAML syntax validation with helpful error messages
- GitHub API error handling
- File system operation error handling
- Network connectivity error handling
- Detailed logging for troubleshooting

## Future Considerations

- **Parallel Download and Extraction:**  
  Separate download and extraction processes for improved performance.
  
- **Additional Archive Formats:**  
  Expand support beyond ZIP archives to include other formats.

- **Non-GitHub Support:**  
  Current focus is primarily on GitHub-based downloads.

## License

This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for more details.

## Author

Kevin Stokes

[Blog write-up](https://dfir-kev.medium.com/tool-fetcher-86691e65731b) · [LinkedIn Profile](https://www.linkedin.com/in/dfir-kev/) · [Buy me a coffee!](https://www.buymeacoffee.com/dfirkev)

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