<?php
/*
  Copyright 2005-2008 Redshift Software, Inc.
  Distributed under the Boost Software License, Version 1.0.
  (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
*/
require_once(dirname(__FILE__) . '/boost.php');
require_once(dirname(__FILE__) . '/url.php');

define('BOOST_DOCS_MODIFIED_DATE', 'Sat 07 Feb 2015 21:44:00 +0000');

class BoostDocumentation
{
    var $params;

    function __construct($params = Array()) {
        $this->params = $params;
    }

    function get_archive_location()
    {
        $path_parts = array();
        preg_match($this->params['pattern'], $this->params['vpath'], $path_parts);

        if (in_array($path_parts[1], array('boost-build', 'regression'))) {
            $this->params['version'] = null;
            $version_dir = $path_parts[1];
        } else {
            $this->params['version'] = BoostVersion::from($path_parts[1]);
            $version_dir = is_numeric($path_parts[1][0]) ?
                "boost_{$path_parts[1]}" : $path_parts[1];
        }
        $this->params['key'] = $path_parts[2];

        $file = false;

        if ($this->params['fix_dir']) {
            $fix_path = "{$this->params['fix_dir']}/{$version_dir}/{$this->params['key']}";

            if (is_file($fix_path) ||
                (is_dir($fix_path) && is_file("{$fix_path}/index.html")))
            {
                $file = $fix_path;
            }
        }

        if (!$file) {
            $file = $this->params['archive_dir'] . '/';

            if ($this->params['archive_subdir'])
            {
                $file = $file . $this->params['archive_file_prefix'] . $version_dir . '/' . $this->params['key'];
            }
            else
            {
                $file = $file . $this->params['archive_file_prefix'] . $this->params['key'];
            }
        }

        $this->params['file'] = $file;
    }

    function display_from_archive($content_map = array())
    {
        // Set default values

        $this->params = array_merge(
            array(
                'pattern' => '@^[/]([^/]+)[/](.*)$@',
                'vpath' => $_SERVER["PATH_INFO"],
                'archive_subdir' => true,
                'fix_dir' => false,
                'archive_dir' => ARCHIVE_DIR,
                'archive_file_prefix' => ARCHIVE_FILE_PREFIX,
                'use_http_expire_date' => false,
                'override_extractor' => null,
                'title' => NULL,
                'charset' => NULL,
                'content' => NULL,
                'error' => false,
            ),
            $this->params
        );

        $this->get_archive_location();

        // Only use a permanent redirect for releases (beta or full).

        $redirect_status_code = $this->params['version'] &&
            $this->params['version']->is_numbered_release() ? 301 : 302;

        // Calculate expiry date if requested.

        $expires = null;
        if ($this->params['use_http_expire_date'])
        {
            if (!$this->params['version']) {
                $expires = "+1 week";
            }
            else {
                $compare_version = BoostVersion::from($this->params['version'])->
                    compare(BoostVersion::current());
                $expires = $compare_version === -1 ? "+1 year" :
                    ($compare_version === 0 ? "+1 week" : "+1 day");
            }
        }

        // Last modified date

        $last_modified = max(
            strtotime(BOOST_DOCS_MODIFIED_DATE),        // last manual documenation update
            filemtime(dirname(__FILE__).'/boost.php'),  // last release (since the version number is updated)
            filemtime($check_file)                      // when the file was modified
        );

        // Check file exists.

        $check_file = $this->params['file'];

        if (is_dir($check_file))
        {
            if(substr($check_file, -1) != '/') {
                $redirect = resolve_url(basename($check_file).'/');
                header("Location: $redirect", TRUE, $redirect_status_code);
                return;
            }

            $found_file = NULL;
            if (is_readable("$check_file/index.html")) $found_file = 'index.html';
            else if (is_readable("$check_file/index.htm")) $found_file = 'index.htm';

            if ($found_file) {
                $this->params['file'] = $check_file = $check_file.$found_file;
                $this->params['key'] = $this->params['key'].$found_file;
            }
            else {
                if (!BoostWeb::http_headers('text/html', $last_modified, $expires))
                    return;

                $display_dir = new BoostDisplayDir($this->params);
                return $display_dir->display($check_file);
            }
        }
        else if (!is_readable($check_file)) {
            BoostWeb::error_page($this->params, 'Unable to find file.');
            return;
        }

        // Choose filter to use

        $info_map = array_merge($content_map, array(
            array('','@[.](txt|py|rst|jam|v2|bat|sh|xml|xsl|toyxml)$@i','text','text/plain'),
            array('','@[.](qbk|quickbook)$@i','qbk','text/plain'),
            array('','@[.](c|h|cpp|hpp)$@i','cpp','text/plain'),
            array('','@[.]png$@i','raw','image/png'),
            array('','@[.]gif$@i','raw','image/gif'),
            array('','@[.](jpg|jpeg|jpe)$@i','raw','image/jpeg'),
            array('','@[.]svg$@i','raw','image/svg+xml'),
            array('','@[.]css$@i','raw','text/css'),
            array('','@[.]js$@i','raw','application/x-javascript'),
            array('','@[.]pdf$@i','raw','application/pdf'),
            array('','@[.](html|htm)$@i','raw','text/html'),
            array('','@(/|^)(Jamroot|Jamfile|ChangeLog|configure)$@i','text','text/plain'),
            array('','@[.]dtd$@i','raw','application/xml-dtd'),
            array('','@[.]json$@i','raw','application/json'),
            ));

        $preprocess = null;
        $extractor = null;
        $type = null;

        foreach ($info_map as $i)
        {
            if (preg_match($i[1],$this->params['key']))
            {
                if ($i[0]) {
                    $version = BoostVersion::from($i[0]);
                    if ($version->compare(BoostVersion::page()) > 0) {
                        // This is after the current version.
                        continue;
                    }
                }

                $extractor = $i[2];
                $type = $i[3];
                $preprocess = isset($i[4]) ? $i[4] : NULL;
                break;
            }
        }

        if ($this->params['override_extractor'])
            $extractor = $this->params['override_extractor'];

        if (!$extractor) {
            if (strpos($_SERVER['HTTP_HOST'], 'www.boost.org') === false) {
                BoostWeb::error_page($this->params,
                    "No extractor found for filename.");
            } else {
                BoostWeb::error_page($this->params);
            }
            return;
        }

        // Handle ETags and Last-Modified HTTP headers.

        // Output raw files.

        if($extractor == 'raw') {
            if (!BoostWeb::http_headers($type, $last_modified, $expires))
                return;

            display_raw_file($this->params, $_SERVER['REQUEST_METHOD'], $type);
        }
        else {
            // Read file from hard drive

            // Note: this sets $this->params['content'] with either the
            // content or an error message.
            if(!extract_file($this->params)) {
                BoostWeb::error_page($this->params, $this->params['content']);
                return;
            }

            // Check if the file contains a redirect.

            if($type == 'text/html') {
                if($redirect = detect_redirect($this->params['content'])) {
                    BoostWeb::http_headers('text/html', null, "+1 day");
                    header("Location: $redirect", TRUE, $redirect_status_code);
                    if($_SERVER['REQUEST_METHOD'] != 'HEAD') echo $this->params['content'];
                    return;
                }
            }

            if (!BoostWeb::http_headers('text/html', $last_modified, $expires))
                return;

            // Finally process the file and display it.

            if($_SERVER['REQUEST_METHOD'] != 'HEAD') {
                if ($preprocess) {
                    $this->params['content'] = call_user_func($preprocess, $this->params['content']);
                }

                echo_filtered($extractor, $this->params);
            }
        }
    }
}

function display_raw_file($params, $method, $type)
{
    ## header('Content-Disposition: attachment; filename="downloaded.pdf"');
    if ($method != 'HEAD') { readfile($params['file']); }
}

function extract_file(&$params) {
    $params['content'] = file_get_contents($params['file']);
    return true;
}

//
// Filters
//

function echo_filtered($extractor, $params) {
    $name = "BoostFilter".underscore_to_camel_case($extractor);
    $extractor = new $name($params);
    $extractor->echo_filtered();
}

function underscore_to_camel_case($name) {
    return str_replace(' ','', ucwords(str_replace('_', ' ', $name)));
}

/*
 * HTML processing functions
 */

function detect_redirect($content)
{
    // Only check small files, since larger files are never redirects, and are
    // expensive to search.
    if(strlen($content) <= 2000 &&
        preg_match(
            '@<meta\s+http-equiv\s*=\s*["\']?refresh["\']?\s+content\s*=\s*["\']0;\s*URL=([^"\']*)["\']\s*/?>@i',
            $content, $redirect))
    {
        return resolve_url($redirect[1]);
    }

    return false;
}

function latest_link($params)
{
    if (!isset($params['version']) || $params['error']) {
        return;
    }

    $version = BoostVersion::from($params['version']);

    $current = BoostVersion::current();
    switch ($current->compare($version))
    {
    case 0:
        break;
    case 1:
        echo '<div class="boost-common-header-notice">';
        if (realpath("{$params['archive_dir']}/{$current->dir()}/$params[key]") !== false)
        {
            echo '<a class="boost-common-header-inner" href="/doc/libs/release/',$params['key'],'">',
                "Click here to view the latest version of this page.",
                '</a>';
        }
        else
        {
            echo '<a class="boost-common-header-inner" href="/doc/libs/">',
                "This is an old version of boost. ",
                "Click here for the latest version's documentation home page.",
                '</a>';
        }
        echo '</div>', "\n";
        break;
    case -1:
        echo '<div class="boost-common-header-notice">';
        echo '<span class="boost-common-header-inner">';
        echo 'This is the documentation for a development version of boost';
        echo '</span>';
        echo '</div>', "\n";
        break;
    }
}