JXA script to export SSH passphrases saved in macOS's Keychain Access

exportSshPassphrases.js

#!/usr/bin/osascript -l JavaScript

// 1. Open Keychain Access.app
// 2. Filter by `SSH:`
// 3. Set pw and outfile in this script
// 4. Run
// 5. Transfer the file to the new device
// 5. Use the sloppy script below to then read that file and add to Keychain Access on the new device

/*
#!/usr/bin/env bash

set -Eeuf -o pipefail

main() {
  jq -r '.[] | "\(.keyfile)::::\(.passphrase)"' ssh-passphrases.json |
    while read -r line; do
      path=${line%%::::*}
      pass=${line##*::::}

      if [[ -f "${path}" && -n "${pass}" ]]; then
        {
          sleep 0.1
          printf '%s' "${pass}"
        } | script -q /dev/null ssh-add --apple-use-keychain "${path}"
      fi
    done
}
main "$@"
*/


'use strict'

const pw = "macosPasswordHere"
const outfile = "/Users/n8henrie/ssh-passphrases.json"

// Increase here if your computer needs a little more time in between UI clicks
const delayFactor = 1

const sys = Application("System Events")
const app = Application.currentApplication()

function getPassphrase(outline, idx) {
	app.setTheClipboardTo("")

	let row = outline.rows[idx]
	let keyfile = row.textFields()[0].value().split("SSH: ").slice(-1)[0].trim()
		
	row.uiElements()[0].actions["AXShowMenu"].perform()
	delay(0.1 * delayFactor)
	outline.menus.at(0).menuItems.byName("Copy Password to Clipboard").click()
	delay(0.5 * delayFactor)
	sys.keystroke(pw)
	sys.keyCode(36)
	delay(0.1 * delayFactor)

	var passphrase = app.theClipboard()
	app.setTheClipboardTo("")
	
	return {keyfile: keyfile, passphrase: passphrase}
}

function run(argv) {
	app.includeStandardAdditions = true
	
	let kc = sys.processes["Keychain Access"].windows.byName("Keychain Access")
	let outline = kc.groups.at(0).splitterGroups.at(0).groups.at(1).scrollAreas.at(0).outlines.at(0)

	let results = []
	for (var idx in outline.rows) {
		results.push(getPassphrase(outline, idx))
	}
	
	const fileID = app.openForAccess(Path(outfile), {writePermission: true})
	app.write(JSON.stringify(results), {to: fileID, as: "text"})
	app.closeAccess(fileID)
	
	return
}