Add usimp.chooseDomainServer

www/res/js/usimp.js

@@ -7,3 +7,31 @@ usimp.lookup = function (domain_name) {
         redirect: "manual",
     });
 }
+
+usimp.chooseDomainServer = function (domainServers, invalidDomainServers = []) {
+    if (domainServers.length === 0) throw Error("No domain servers specified");
+
+    domainServers.filter(srv => invalidDomainServers.map(srv => srv.host).includes(srv));
+    if (domainServers.length === 0) throw Error("No domain servers reachable");
+    if (domainServers.length === 1) return domainServers[0];
+
+    let priority = domainServers.reduce((min, srv) => Math.min(min, srv.priority), Infinity);
+    domainServers = domainServers.filter(srv => srv.priority === priority);
+    if (domainServers.length === 1) return domainServers[0];
+
+    let totalWeight = domainServers.reduce((total, srv) => total + srv.weight, 0);
+    let w = Math.floor(Math.random() * totalWeight);
+
+    let accumulator = 0;
+    for (let srv of domainServers) {
+        accumulator += srv.weight;
+        if (w < accumulator) return srv;
+    }
+
+    console.warn("Domain server selection not worked correctly");
+    return domainServers[0];
+}
+
+usimp.login = function (domainServer, accountName, password) {
+    return fetch(``)
+}