blob: 3b273337fc4b821f69cfc00a1fac90ceb7136811 [file] [log] [blame]
import {waitFor} from 'poll-until-promise';
import {CCApi} from '../../common/api.js';
import {parseUrl} from '../../common/commonUtils.js';
import AvatarsDB from './utils/AvatarsDB.js'
export default class AvatarsHandler {
constructor() {
this.isFilterSetUp = false;
this.privateForums = [];
this.db = new AvatarsDB();
}
// Gets a list of private forums. If it is already cached, the cached list is
// returned; otherwise it is also computed and cached.
getPrivateForums() {
return new Promise((resolve, reject) => {
if (this.isFilterSetUp) return resolve(this.privateForums);
if (!document.documentElement.hasAttribute('data-startup'))
return reject('[threadListAvatars] Couldn\'t get startup data.');
var startupData =
JSON.parse(document.documentElement.getAttribute('data-startup'));
var forums = startupData?.['1']?.['2'];
if (forums === undefined)
return reject(
'[threadListAvatars] Couldn\'t retrieve forums from startup data.');
for (var f of forums) {
var forumId = f?.['2']?.['1']?.['1'];
var forumVisibility = f?.['2']?.['18'];
if (forumId === undefined || forumVisibility === undefined) {
console.warn(
'[threadListAvatars] Coudln\'t retrieve forum id and/or forum visibility for the following forum:',
f);
continue;
}
// forumVisibility's value 1 means "PUBLIC".
if (forumVisibility != 1) this.privateForums.push(forumId);
}
// Forum 51488989 is marked as public but it is in fact private.
this.privateForums.push('51488989');
this.isFilterSetUp = true;
return resolve(this.privateForums);
});
}
// Some threads belong to private forums, and this feature will not be able to
// get its avatars since it makes an anonymomus call to get the contents of
// the thread.
//
// This function returns whether avatars should be retrieved depending on if
// the thread belongs to a known private forum.
shouldRetrieveAvatars(thread) {
return this.getPrivateForums().then(privateForums => {
return !privateForums.includes(thread.forum);
});
}
// Get an object with the author of the thread, an array of the first |num|
// replies from the thread |thread|, and additional information about the
// thread.
getFirstMessages(thread, num = 15) {
return CCApi(
'ViewThread', {
1: thread.forum,
2: thread.thread,
// options
3: {
// pagination
1: {
2: num, // maxNum
},
3: true, // withMessages
5: true, // withUserProfile
10: false, // withPromotedMessages
16: false, // withThreadNotes
18: true, // sendNewThreadIfMoved
}
},
// |authentication| is false because otherwise this would mark
// the thread as read as a side effect, and that would mark all
// threads in the list as read.
//
// Due to the fact that we have to call this endpoint
// anonymously, this means we can't retrieve information about
// threads in private forums.
/* authentication = */ false)
.then(data => {
var numMessages = data?.['1']?.['8'];
if (numMessages === undefined)
throw new Error(
'Request to view thread doesn\'t include the number of messages');
var messages = numMessages == 0 ? [] : data?.['1']['3'];
if (messages === undefined)
throw new Error(
'numMessages was ' + numMessages +
' but the response didn\'t include any message.');
var author = data?.['1']?.['4'];
if (author === undefined)
throw new Error(
'Author isn\'t included in the ViewThread response.');
return {
messages,
author,
// The following fields are useful for the cache and can be
// undefined, but this is checked before adding an entry to the
// cache.
updatedTimestamp: data?.['1']?.['2']?.['1']?.['4'],
lastMessageId: data?.['1']?.['2']?.['10'],
};
});
}
// Get a list of at most |num| avatars for thread |thread| by calling the API
getVisibleAvatarsFromServer(thread, num) {
return this.getFirstMessages(thread).then(result => {
var messages = result.messages;
var author = result.author;
var updatedTimestamp =
Math.floor(Number.parseInt(result.updatedTimestamp) / 1000000);
var lastMessageId = result.lastMessageId;
var avatarUrls = [];
var authorUrl = author?.['1']?.['2'];
if (authorUrl !== undefined) avatarUrls.push(authorUrl);
for (var m of messages) {
var url = m?.['3']?.['1']?.['2'];
if (url === undefined) continue;
if (!avatarUrls.includes(url)) avatarUrls.push(url);
if (avatarUrls.length == 3) break;
}
// Add entry to cache if all the extra metadata could be retrieved.
if (updatedTimestamp !== undefined && lastMessageId !== undefined)
this.db.putCacheEntry({
threadId: thread.thread,
updatedTimestamp,
lastMessageId,
avatarUrls,
num,
lastUsedTimestamp: Math.floor(Date.now() / 1000),
});
return avatarUrls;
});
}
// Returns an object with a cache entry that matches the request if found (via
// the |entry| property). The property |found| indicates whether the cache
// entry was found.
getVisibleAvatarsFromCache(thread, num) {
return waitFor(
() => this.db.getCacheEntry(thread.thread).then(entry => {
if (entry === undefined || entry.num < num)
return {
found: false,
};
// Only use cache entry if lastUsedTimestamp is within the last 30
// seconds (which means it has been checked for invalidations):
var now = Math.floor(Date.now() / 1000);
var diff = now - entry.lastUsedTimestamp;
if (diff > 30)
throw new Error(
'lastUsedTimestamp isn\'t within the last 30 seconds (the difference is:',
diff, ').');
return {
found: true,
entry,
};
}),
{
interval: 400,
timeout: 10 * 1000,
});
}
// Get a list of at most |num| avatars for thread |thread|
getVisibleAvatars(thread, num = 3) {
return this.shouldRetrieveAvatars(thread).then(shouldRetrieve => {
if (!shouldRetrieve) {
console.debug('[threadListAvatars] Skipping thread', thread);
return [];
}
return this.getVisibleAvatarsFromCache(thread, num)
.then(res => {
if (res.found) return res.entry.avatarUrls;
return this.getVisibleAvatarsFromServer(thread, num);
})
.catch(err => {
console.error(
'[threadListAvatars] Error while retrieving avatars:', err);
return this.getVisibleAvatarsFromServer(thread, num);
});
});
}
// Inject avatars for thread summary (thread item) |node| in a thread list.
inject(node) {
var header = node.querySelector(
'ec-thread-summary .main-header .panel-description a.header');
if (header === null) {
console.error(
'[threadListAvatars] Header is not present in the thread item\'s DOM.');
return;
}
var thread = parseUrl(header.href);
if (thread === false) {
console.error('[threadListAvatars] Thread\'s link cannot be parsed.');
return;
}
this.getVisibleAvatars(thread)
.then(avatarUrls => {
var avatarsContainer = document.createElement('div');
avatarsContainer.classList.add('TWPT-avatars');
var count = Math.floor(Math.random() * 4);
for (var i = 0; i < avatarUrls.length; ++i) {
var avatar = document.createElement('div');
avatar.classList.add('TWPT-avatar');
avatar.style.backgroundImage = 'url(\'' + avatarUrls[i] + '\')';
avatarsContainer.appendChild(avatar);
}
header.appendChild(avatarsContainer);
})
.catch(err => {
console.error(
'[threadListAvatars] Could not retrieve avatars for thread',
thread, err);
});
}
};