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September 3, 2024 07:04
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Solution to the Longshot Systems hiring challenge.
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| from base64 import b64encode, b64decode | |
| from playwright.sync_api import sync_playwright | |
| def exec_instruction(instruction): | |
| instruction = b64decode(instruction)[1:-1] | |
| if instruction == b"END": | |
| page.evaluate(f"ws.send('{b64encode(bytes(f'{sum(registers)}', 'utf8')).decode()}')") | |
| return | |
| elif instruction[0] not in (65, 77, 83): # ADD, MOV, STORE | |
| return | |
| match instruction.split(): | |
| case [b"ADD", value, r1, r2]: | |
| r1, r2 = int(r1[1:]), int(r2[1:]) | |
| registers[r2] = registers[r1] + int(value) | |
| case [b"MOV", r1, r2]: | |
| r1, r2 = int(r1[1:]), int(r2[1:]) | |
| registers[r2] = registers[r1] | |
| case [b"STORE", value, r1]: | |
| r1 = int(r1[1:]) | |
| registers[r1] = int(value) | |
| with sync_playwright() as p: | |
| browser = p.chromium.launch(headless=False) | |
| page = browser.new_page() | |
| # Challenge 1 | |
| page.goto("https://challenge.longshotsystems.co.uk/go") | |
| container = page.locator("xpath=/html/body/div/div[1]/div") | |
| answer = "".join([e.strip() for e in container.all_text_contents()]) | |
| page.evaluate("document.querySelector('.answer-panel').style.visibility = 'visible';") | |
| page.get_by_label("Answer").fill(answer) | |
| page.get_by_label("name").fill("Your Name") | |
| page.get_by_role("button").click() | |
| # Challenge 2 | |
| registers = [0] * 16 | |
| page.on("websocket", lambda ws: ws.on("framereceived", lambda msg: exec_instruction(msg))) | |
| page.wait_for_timeout(5000) | |
| input("Press enter to exit") | |
| browser.close() |
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