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da5484b61f
WSLg bridges clipboard text but not images — pull host screenshots via PowerShell. Disable titleBarOverlay on plain Linux; gate overlay width per platform in titlebar-overlay-width.cjs.
92 lines
3.4 KiB
JavaScript
92 lines
3.4 KiB
JavaScript
// Pull a Windows-host clipboard image from inside WSL2 via PowerShell (WSLg
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// bridges text but not images). Returns PNG bytes or null; exec injectable.
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const { execFileSync } = require('node:child_process')
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// STA is mandatory: System.Windows.Forms.Clipboard throws ThreadStateException
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// off a single-threaded apartment. We emit base64 (not raw bytes) so the PNG
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// survives stdout's text decoding intact, and write with [Console]::Out.Write
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// to avoid a trailing newline.
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const PS_SCRIPT = [
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'Add-Type -AssemblyName System.Windows.Forms,System.Drawing',
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'$img = [System.Windows.Forms.Clipboard]::GetImage()',
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'if ($null -eq $img) { exit 0 }',
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'$ms = New-Object System.IO.MemoryStream',
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'$img.Save($ms, [System.Drawing.Imaging.ImageFormat]::Png)',
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'[Console]::Out.Write([System.Convert]::ToBase64String($ms.ToArray()))'
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].join('\n')
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// PowerShell's -EncodedCommand takes UTF-16LE base64. Encoding the whole script
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// this way sidesteps every layer of WSL→Windows quoting (spaces, quotes,
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// brackets, newlines) that plain -Command arguments would mangle.
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function encodePowerShellCommand(script) {
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return Buffer.from(String(script), 'utf16le').toString('base64')
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}
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// Locate powershell.exe. The bare name resolves through WSL's Windows-interop
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// PATH on every standard WSL2 setup; the absolute fallback covers a stripped
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// PATH. Returns the first candidate — execFile surfaces ENOENT if it's wrong
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// and we fall back to null.
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function powershellCandidates() {
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return ['powershell.exe', '/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe']
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}
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function decodeClipboardImageBase64(stdout) {
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const b64 = String(stdout || '').trim()
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if (!b64) return null
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let buffer
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try {
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buffer = Buffer.from(b64, 'base64')
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} catch {
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return null
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}
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// Guard against partial / garbage output: require a real PNG signature.
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const PNG_SIGNATURE = Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])
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if (buffer.length < PNG_SIGNATURE.length || !buffer.subarray(0, PNG_SIGNATURE.length).equals(PNG_SIGNATURE)) {
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return null
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}
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return buffer
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}
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// Read the Windows clipboard image from inside WSL. Returns a PNG Buffer, or
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// null when there's no image, PowerShell is unreachable, or output is invalid.
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// Linux-only by contract (caller gates on IS_WSL); never throws.
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function readWslWindowsClipboardImage({ exec = execFileSync, candidates = powershellCandidates() } = {}) {
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const encoded = encodePowerShellCommand(PS_SCRIPT)
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for (const ps of candidates) {
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try {
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const stdout = exec(
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ps,
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['-NoProfile', '-NonInteractive', '-STA', '-ExecutionPolicy', 'Bypass', '-EncodedCommand', encoded],
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{
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encoding: 'utf8',
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windowsHide: true,
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timeout: 8000,
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// A 4K screenshot base64s to a few MB; give stdout generous headroom.
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maxBuffer: 64 * 1024 * 1024,
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// PowerShell writes progress/CLIXML noise to stderr — ignore it.
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stdio: ['ignore', 'pipe', 'ignore']
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}
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)
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const decoded = decodeClipboardImageBase64(stdout)
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if (decoded) return decoded
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// Empty stdout = no image on the clipboard; stop, don't try fallbacks.
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if (String(stdout || '').trim() === '') return null
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} catch {
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// This powershell.exe candidate is missing/failed — try the next one.
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}
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}
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return null
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}
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module.exports = {
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decodeClipboardImageBase64,
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encodePowerShellCommand,
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powershellCandidates,
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readWslWindowsClipboardImage
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}
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