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content.js
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let isWindowActivated, windowActivatedTime, messagesRemaining, maxMessages, capWindow, originalPlaceholder
let localDataSet = false
// set these manually as an ultimate fallback
const defaultMaxMessages = 50
const defaultCapWindow = 180
// semi-reliable way of determining if the page has fully loaded yet since window.onload fires too early
const resourceObserver = new PerformanceObserver((list) => {
const entries = list.getEntries();
for (const entry of entries) {
// start trying to load data and inject the messages when the API polls for the conversation limit data
if (entry.initiatorType === 'fetch' && entry.name === 'https://chat.openai.com/public-api/conversation_limit') {
fetch(entry.name)
.then(response => response.json())
.then(data => {
if ('message_cap' in data && 'message_cap_window' in data) {
maxMessages = parseInt(data.message_cap);
capWindow = parseInt(data.message_cap_window);
if (maxMessages == 50) {
// looks like the API is currently returning 50 but their UI says 40, so we'll go with 40 for now
// if the API does update to return some other number than 50 then we'll trust that instead
maxMessages = 40;
}
}
setCapDataInStorage();
setLocalDataFromStorage();
// potentially update the message every second, relevant if fewer than 60 seconds remain in the window
// also really ensure the send button events are added since they seemed to be missed when only called once
setInterval(() => {
registerSendButtonTracker();
registerRegenerateButtonTracker();
registerSaveAndSubmitButtonTracker();
updateLimitMessage();
}, 1000);
})
.catch(/* don't break the page in case this the page or API fundamentally changes */);
// no need to waste resources polling for resources if we already hit our load point
resourceObserver.disconnect();
break;
}
}
});
connectResourceObserver()
function connectResourceObserver() {
resourceObserver.observe({ entryTypes: ['resource'] });
}
function setCapDataInStorage() {
if (maxMessages && capWindow) {
chrome.storage.sync.set({
'chatGPT4CapData.maxMessages': maxMessages,
'chatGPT4CapData.capWindow': capWindow,
});
}
}
function setLocalDataFromStorage() {
chrome.storage.sync.get([
'chatGPT4CapData.maxMessages',
'chatGPT4CapData.capWindow',
'chatGPT4CapData.isWindowActivated',
'chatGPT4CapData.windowActivatedTime',
'chatGPT4CapData.messagesRemaining'
], (result) => {
maxMessages = parseInt(result['chatGPT4CapData.maxMessages'] || maxMessages || defaultMaxMessages);
capWindow = parseInt(result['chatGPT4CapData.capWindow'] || capWindow || defaultCapWindow);
isWindowActivated = Boolean(result['chatGPT4CapData.isWindowActivated'] || false);
windowActivatedTime = result['chatGPT4CapData.windowActivatedTime'] || null;
messagesRemaining = parseInt(result['chatGPT4CapData.messagesRemaining'] || maxMessages);
if (windowActivatedTime !== null) windowActivatedTime = parseInt(windowActivatedTime)
localDataSet = true
});
}
function getDivContaining(containingStr) {
let deepestDiv = null;
let deepestDepth = -1;
function searchDiv(node, depth) {
if (node.nodeName === 'DIV' && node.textContent.includes(containingStr)) {
if (depth > deepestDepth) {
deepestDiv = node;
deepestDepth = depth;
}
}
for (let i = 0; i < node.childNodes.length; i++) {
searchDiv(node.childNodes[i], depth + 1);
}
}
searchDiv(document.body, 0);
return deepestDiv;
}
function updateLimitMessage() {
if (!localDataSet) {
return
}
const isValidWindowActivatedTime = windowActivatedTime !== null && !isNaN(windowActivatedTime)
let hoursRemaining, minutesRemaining, secondsRemaining
if (isValidWindowActivatedTime) {
const windowEndTime = windowActivatedTime + (capWindow * 60)
secondsRemaining = windowEndTime - Math.floor(Date.now() / 1000)
hoursRemaining = Math.floor(secondsRemaining / 3600)
minutesRemaining = Math.floor(secondsRemaining % 3600 / 60)
}
let message = 'You have not activated your cap window yet.';
if (secondsRemaining < 0) {
if (isWindowActivated) {
isWindowActivated = false
messagesRemaining = maxMessages
chrome.storage.sync.set({
'chatGPT4CapData.isWindowActivated': isWindowActivated,
'chatGPT4CapData.windowActivatedTime': null,
'chatGPT4CapData.messagesRemaining': messagesRemaining
});
}
}
if (isValidWindowActivatedTime && isWindowActivated) {
const remainingTimeMessage = secondsRemaining >= 60
? `${hoursRemaining} hours and ${minutesRemaining} minutes`
: `${secondsRemaining} seconds`
message = `You have ${messagesRemaining} remaining. Your limit will reset in ${remainingTimeMessage}.`;
}
const messagePromptDiv = getDivContaining('Message ChatGPT')
if (messagePromptDiv !== null) {
// this will add the limit cap info to the footnote warning in a new conversation
updateMessageFootnote(messagePromptDiv, message)
// remove any potentially rendered prompt once/if this has loaded so we don't display double message
updateMessagePlaceholder(message, true)
} else {
// this will add the limit cap info to the placeholder text in the prompt field of an ongoing conversation
updateMessagePlaceholder(message)
}
}
function updateMessageFootnote(messagePromptDiv, message) {
let capInfoSpan = document.getElementById('cap-info-span');
if (!capInfoSpan) {
capInfoSpan = document.createElement('span');
capInfoSpan.id = 'cap-info-span';
messagePromptDiv.appendChild(capInfoSpan);
}
capInfoSpan.textContent = isGpt4() ? `\n${message}` : '';
}
function updateMessagePlaceholder(message, reset = false) {
let prompt = document.getElementById('prompt-textarea');
if (prompt === null) return
if (!originalPlaceholder) originalPlaceholder = prompt.placeholder
prompt.placeholder = isGpt4() && !reset ? `${originalPlaceholder}. ${message}` : originalPlaceholder
}
function registerSendButtonTracker() {
const inputField = document.getElementById('prompt-textarea');
if (!inputField) return;
const button = inputField.nextElementSibling;
if (button && !button.hasAttribute('listenerOnClick')) {
button.addEventListener('click', onMessageSent);
button.setAttribute('listenerOnClick', 'true');
}
// cover the case when we send a message via Enter instead of clicking the button
if (inputField && !inputField.hasAttribute('listenerOnClick')) {
inputField.addEventListener('keyup', (event) => {
if (['Enter', 'NumpadEnter'].includes(event.key) && !event.shiftKey) {
onMessageSent()
}
});
inputField.setAttribute('listenerOnClick', 'true');
}
}
function registerRegenerateButtonTracker() {
const regenDiv = getDivContaining('Regenerate response');
if (!regenDiv) return;
const regenButton = regenDiv.parentElement;
if (regenButton && !regenButton.hasAttribute('listenerOnClick')) {
regenButton.addEventListener('click', onMessageSent);
regenButton.setAttribute('listenerOnClick', 'true');
}
}
function registerSaveAndSubmitButtonTracker() {
const saveAndSubmitDiv = getDivContaining('Save & Submit');
if (!saveAndSubmitDiv) return;
const editButton = saveAndSubmitDiv.parentElement;
if (editButton && !editButton.hasAttribute('listenerOnClick')) {
editButton.addEventListener('click', onMessageSent);
editButton.setAttribute('listenerOnClick', 'true');
}
}
function onMessageSent() {
if (!isGpt4()) {
return
}
if (!isWindowActivated) {
isWindowActivated = true;
windowActivatedTime = Math.floor(Date.now() / 1000);
messagesRemaining = maxMessages - 1;
} else {
messagesRemaining -= 1;
}
chrome.storage.sync.set({
'chatGPT4CapData.isWindowActivated': isWindowActivated,
'chatGPT4CapData.windowActivatedTime': windowActivatedTime,
'chatGPT4CapData.messagesRemaining': messagesRemaining
});
updateLimitMessage();
}
function isGpt4() {
if (window.location.href === 'https://chat.openai.com/?model=gpt-4') {
return true
}
return Array.from(document.querySelectorAll('span.text-token-text-secondary')).some(element => {
return element.textContent === '4';
});
}
const observeUrlChange = () => {
let oldHref = document.location.href;
const body = document.querySelector('body');
const urlObserver = new MutationObserver(() => {
if (oldHref !== document.location.href) {
oldHref = document.location.href;
connectResourceObserver()
}
});
urlObserver.observe(body, { childList: true, subtree: true });
};
window.onload = observeUrlChange;