sync/lib/channel/filters.js

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var ChannelModule = require("./module");
var XSS = require("../xss");
function ChatFilter(name, regex, flags, replace, active, filterlinks) {
this.name = name;
this.source = regex;
this.flags = flags;
this.regex = new RegExp(this.source, flags);
this.replace = replace;
this.active = active === false ? false : true;
this.filterlinks = filterlinks || false;
}
ChatFilter.prototype = {
pack: function () {
return {
name: this.name,
source: this.source,
flags: this.flags,
replace: this.replace,
active: this.active,
filterlinks: this.filterlinks
};
},
exec: function (str) {
return str.replace(this.regex, this.replace);
}
};
function FilterList(defaults) {
if (!defaults) {
defaults = [];
}
this.filters = defaults.map(function (f) {
return new ChatFilter(f.name, f.source, f.flags, f.replace, f.active, f.filterlinks);
});
}
FilterList.prototype = {
pack: function () {
return this.filters.map(function (f) { return f.pack(); });
},
importList: function (filters) {
this.filters = Array.prototype.slice.call(filters);
},
updateFilter: function (filter) {
if (!filter.name) {
filter.name = filter.source;
}
var found = false;
for (var i = 0; i < this.filters.length; i++) {
if (this.filters[i].name === filter.name) {
found = true;
this.filters[i] = filter;
break;
}
}
/* If no filter was updated, add a new one */
if (!found) {
this.filters.push(filter);
}
},
removeFilter: function (filter) {
var found = false;
for (var i = 0; i < this.filters.length; i++) {
if (this.filters[i].name === filter.name) {
this.filters.splice(i, 1);
break;
}
}
},
moveFilter: function (from, to) {
if (from < 0 || to < 0 ||
from >= this.filters.length || to >= this.filters.length) {
return false;
}
var f = this.filters[from];
/* Offset from/to indexes to account for the fact that removing
an element changes the position of one of them.
I could have just done a swap, but it's already implemented this way
and it works. */
to = to > from ? to + 1 : to;
from = to > from ? from : from + 1;
this.filters.splice(to, 0, f);
this.filters.splice(from, 1);
return true;
},
exec: function (str, opts) {
if (!opts) {
opts = {};
}
this.filters.forEach(function (f) {
if (opts.filterlinks && !f.filterlinks) {
return;
}
if (f.active) {
str = f.exec(str);
}
});
return str;
}
};
function validateFilter(f) {
if (typeof f.source !== "string" || typeof f.flags !== "string" ||
typeof f.replace !== "string") {
return false;
}
if (typeof f.name !== "string") {
f.name = f.source;
}
f.replace = f.replace.substring(0, 1000);
f.replace = XSS.sanitizeHTML(f.replace);
f.flags = f.flags.substring(0, 4);
try {
new RegExp(f.source, f.flags);
} catch (e) {
return false;
}
var filter = new ChatFilter(f.name, f.source, f.flags, f.replace,
Boolean(f.active), Boolean(f.filterlinks));
return filter;
}
const DEFAULT_FILTERS = [
new ChatFilter("monospace", "`(.+?)`", "g", "<code>$1</code>"),
new ChatFilter("bold", "\\*(.+?)\\*", "g", "<strong>$1</strong>"),
new ChatFilter("italic", "_(.+?)_", "g", "<em>$1</em>"),
new ChatFilter("strike", "~~(.+?)~~", "g", "<s>$1</s>"),
new ChatFilter("inline spoiler", "\\[sp\\](.*?)\\[\\/sp\\]", "ig", "<span class=\"spoiler\">$1</span>")
];
function ChatFilterModule(channel) {
ChannelModule.apply(this, arguments);
this.filters = new FilterList(DEFAULT_FILTERS);
}
ChatFilterModule.prototype = Object.create(ChannelModule.prototype);
ChatFilterModule.prototype.load = function (data) {
if ("filters" in data) {
for (var i = 0; i < data.filters.length; i++) {
var f = validateFilter(data.filters[i]);
if (f) {
this.filters.updateFilter(f);
}
}
}
};
ChatFilterModule.prototype.save = function (data) {
data.filters = this.filters.pack();
};
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ChatFilterModule.prototype.packInfo = function (data, isAdmin) {
if (isAdmin) {
data.chatFilterCount = this.filters.filters.length;
}
};
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ChatFilterModule.prototype.onUserPostJoin = function (user) {
user.socket.on("updateFilter", this.handleUpdateFilter.bind(this, user));
user.socket.on("importFilters", this.handleImportFilters.bind(this, user));
user.socket.on("moveFilter", this.handleMoveFilter.bind(this, user));
user.socket.on("removeFilter", this.handleRemoveFilter.bind(this, user));
user.socket.on("requestChatFilters", this.handleRequestChatFilters.bind(this, user));
};
ChatFilterModule.prototype.sendChatFilters = function (users) {
var f = this.filters.pack();
var chan = this.channel;
users.forEach(function (u) {
if (chan.modules.permissions.canEditFilters(u)) {
u.socket.emit("chatFilters", f);
}
});
};
ChatFilterModule.prototype.handleUpdateFilter = function (user, data) {
if (typeof data !== "object") {
return;
}
if (!this.channel.modules.permissions.canEditFilters(user)) {
return;
}
var f = validateFilter(data);
if (!f) {
return;
}
data = f.pack();
this.filters.updateFilter(f);
var chan = this.channel;
chan.users.forEach(function (u) {
if (chan.modules.permissions.canEditFilters(u)) {
u.socket.emit("updateChatFilter", data);
}
});
chan.logger.log("[mod] " + user.getName() + " updated filter: " + f.name + " -> " +
"s/" + f.source + "/" + f.replace + "/" + f.flags + " active: " +
f.active + ", filterlinks: " + f.filterlinks);
};
ChatFilterModule.prototype.handleImportFilters = function (user, data) {
if (!(data instanceof Array)) {
return;
}
/* Note: importing requires a different permission node than simply
updating/removing */
if (!this.channel.modules.permissions.canImportFilters(user)) {
return;
}
this.filters.importList(data.map(validateFilter).filter(function (f) {
return f !== false;
}));
this.channel.logger.log("[mod] " + user.getName() + " imported the filter list");
this.sendChatFilters(this.channel.users);
};
ChatFilterModule.prototype.handleRemoveFilter = function (user, data) {
if (typeof data !== "object") {
return;
}
if (!this.channel.modules.permissions.canEditFilters(user)) {
return;
}
if (typeof data.name !== "string") {
return;
}
this.filters.removeFilter(data);
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var chan = this.channel;
chan.users.forEach(function (u) {
if (chan.modules.permissions.canEditFilters(u)) {
u.socket.emit("deleteChatFilter", data);
}
});
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this.channel.logger.log("[mod] " + user.getName() + " removed filter: " + data.name);
};
ChatFilterModule.prototype.handleMoveFilter = function (user, data) {
if (typeof data !== "object") {
return;
}
if (!this.channel.modules.permissions.canEditFilters(user)) {
return;
}
if (typeof data.to !== "number" || typeof data.from !== "number") {
return;
}
this.filters.moveFilter(data.from, data.to);
};
ChatFilterModule.prototype.handleRequestChatFilters = function (user) {
this.sendChatFilters([user]);
};
module.exports = ChatFilterModule;