<?php
// this file should only be included if AdmiralAdBlockAnalytics::enabled()

// block direct access to this plugin
defined("ABSPATH") or die("");

function admiraladblock_inject_public_script($uri, $host, $acceptEncoding)
{
    $res = array("matched" => false,
                 "error" => null,
                 "source" => "",
                 "headers" => array(),
                 "contentType" => "application/javascript",
                 );
    if (empty($uri) || $_SERVER["REQUEST_METHOD"] !== "GET" || stripos($uri, AdmiralAdBlockAnalytics::$scriptURIPrefix) !== 0) {
        return $res;
    }

    $offset = strlen(AdmiralAdBlockAnalytics::$scriptURIPrefix);
    // check if this is a valid filename
    $basename = substr($uri, $offset);
    //make sure the filename doesn't already exist first
    if (AdmiralAdBlockAnalytics::doesWPContentFileExist($basename)) {
        //error_log("AdmiralAnalytics: Preventing injecting existing file for $basename");
        return $res;
    }

    $seeds = AdmiralAdBlockAnalytics::getSeedsWithHost("hazadblock", $host);
    if (!AdmiralAdBlockAnalytics::doesURIContainRandomFilename($uri, $seeds)) {
        //error_log("AdmiralAnalytics: uri failed $uri");
        return $res;
    }

    $res["matched"] = true;

    $headers = array();
    if (!empty($acceptEncoding)) {
        $headers[] = "Accept-Encoding: $acceptEncoding";
    }
    $scriptRes = AdmiralAdBlockAnalytics::fetchScript($headers, $_SERVER["HTTP_HOST"]);
    $res["error"] = $scriptRes["error"];
    $res["source"] = $scriptRes["source"];
    $res["headers"] = $scriptRes["headers"];
    return $res;
}

function admiraladblock_proxy_record($uri, $host)
{
    $res = array("matched" => false,
                 "error" => null,
                 "source" => "",
                 "headers" => array(),
                 "contentType" => "application/json",
                 );
    if (empty($uri) || $_SERVER["REQUEST_METHOD"] !== "POST" || substr_count($uri, "/") > 1) {
        return $res;
    }

    $seeds = AdmiralAdBlockAnalytics::getSeedsWithHost("hoothoot", $host);
    if (!AdmiralAdBlockAnalytics::doesURIContainRandomFilename($uri, $seeds)) {
        return $res;
    }

    $res["matched"] = true;

    $entityBody = "";
    try {
        $entityBody = file_get_contents('php://input');
    } catch (Exception $e) {
        error_log("AdmiralAnalytics: Error reading POST body: " . $e->getMessage());
    }

    $proxyRes = AdmiralAdBlockAnalytics::proxyRecord($entityBody);
    $res["error"] = $proxyRes["error"];
    $res["source"] = $proxyRes["source"];
    $res["headers"] = $proxyRes["headers"];
    return $res;
}

function admiraladblock_inject_proxy($query)
{
    $acceptEncoding = "";
    if (!empty($_SERVER["HTTP_ACCEPT_ENCODING"])) {
        $acceptEncoding = $_SERVER["HTTP_ACCEPT_ENCODING"];
    }
    $res = admiraladblock_inject_public_script($_SERVER["REQUEST_URI"], $_SERVER["HTTP_HOST"], $acceptEncoding);
    if (!$res["matched"]) {
        $res = admiraladblock_proxy_record($_SERVER["REQUEST_URI"], $_SERVER["HTTP_HOST"]);
        if (!$res["matched"]) {
            return $query;
        }
        // let the proxy request go through for the record proxy
    }
    if (!empty($res["error"])) {
        $errorString = json_encode($res["error"]);
        error_log("AdmiralAnalytics: Error proxying: $errorString");
        if (function_exists("wp_die")) {
            wp_die("", "", 500);
        }
    } else {
        if (!headers_sent()) {
            if (!empty($res["headers"])) {
                foreach ($res["headers"] as $header) {
                    header($header, true);
                }
            } else {
                // at least tell the browser that its javascript
                header("Content-Type: {$res["contentType"]}", true);
            }
        }
        echo $res["source"];
    }
    die();
}

add_action("parse_request", "admiraladblock_inject_proxy");

function admiraladblock_enqueue_script()
{
    $url = AdmiralAdBlockAnalytics::getPublicScriptURL($_SERVER["HTTP_HOST"]);
    if (!empty($url)) {
        // no deps, no version, yes in footer
        wp_enqueue_script("admiral-adblock-analytics", $url, array(), false, true);
    }
}

add_action("wp_enqueue_scripts", "admiraladblock_enqueue_script");

/* EOF */