Synchronet v3.19b-Win32 (install) has been released (Jan-2022).

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server:web [2010/02/21 19:58] – created digitalmanserver:web [2015/11/09 21:04] – [webctrl.ini per-directory configuration file] Move AccessRequirements example into AccessRequirements section. deuce
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 ====== Web Server ====== ====== Web Server ======
  
-TODO+The Synchronet Web Server serves static (e.g. files) and dynamic content to HTTP clients (e.g. web browsers). 
 + 
 +===== Introduction ===== 
 + 
 +The Synchronet Web Server is a mostly HTTP 1.1 compliant web server capable of 
 +handing basic web servicing tasks.  It has most of the basic features of a 
 +general-purpose web server one would come to expect (including CGI). 
 + 
 +It also, through Server-Side JavaScript (SSJS), allows dynamic pages to be 
 +created which can access BBS data directly. 
 + 
 + 
 +===== Configuration ===== 
 + 
 +==== Startup INI [Web] Section Keys ==== 
 + 
 +The ''[Web]'' section of your [[config:sbbs.ini]] file contains the following settings (keys): 
 + 
 +=== RootDirectory === 
 + 
 +Default value: ''../web/root'' 
 + 
 +This is the root directory of your web server... a request to 
 +''http://yourbbs.synchro.net/index.html'' will be served out of this directory. 
 + 
 +**NOTE**: Older versions of Synchronet had this value default to ''../web/html'' 
 + 
 +=== ErrorDirectory === 
 +Default value: ''error'' 
 + 
 +The directory relative to [[#RootDirectory]] where the various error 
 +message files are located.  The error message files are named by the 
 +numeric HTTP error code they will represent and may be either ''.html'' 
 +or ''.ssjs'' files (''.ssjs'' files take precedence over ''.html'' files for the 
 +same error). 
 + 
 +=== IndexFileNames === 
 + 
 +Default value: ''index.html,index.ssjs'' 
 + 
 +A comma-separated list of filenames in order of preference to serve as 
 +the default document in a directory.  Many Sysops change this to: 
 +''index.html,index.htm,index.ssjs''. 
 +Do not remove the ''index.ssjs'' unless you are not using the stock 
 +web pages at all. 
 + 
 +=== Authorization === 
 + 
 +Default value: ''Basic,Digest'' 
 + 
 +A comma-separated list of authentication mechanisms in order of preference. 
 +The standards say that Basic must come first, but no browser currently 
 +appears to use Digest if Basic is listed first.  Supported values are Basic 
 +and Digest.  Digest is more secure as the users password is not sent in the 
 +clear over the wire. 
 + 
 +=== CGIDirectory === 
 +Default value: ''cgi-bin'' 
 + 
 +A directory relative to [[#RootDirectory]] where any files found will be 
 +considered CGI-executable. Be careful what files you put in this 
 +directory. 
 + 
 +=== CGIExtensions === 
 +Default value: ''.cgi'' 
 + 
 +A comma-separated list of file extensions/suffixes. Files with these 
 +extensions will be considered CGI-executable and the web server will 
 +attempt to execute them as such. 
 + 
 +Other probably values include: ''.pl,.php,.exe'' 
 + 
 +=== DefaultCGIContent === 
 + 
 +Default value: ''text/plain'' 
 + 
 +If the CGI program does not generate a content-type header, this value 
 +will be used for the MIME content-type specified in the HTTP response. 
 + 
 +=== JavaScriptExtension === 
 + 
 +Default value: ''.ssjs'' 
 + 
 +Files with this extension will be considered SSJS files.  On all 
 +systems, this will be attempted to run with the JavaScript interpreter. 
 + 
 +=== MaxInactivity === 
 + 
 +Default value: ''120'' 
 + 
 +If a client holds a connection open for this many seconds without a 
 +request, the web server will shut down the connection. 
 + 
 +=== MaxCgiInactivity === 
 + 
 +Defalut value: ''120'' 
 + 
 +If a CGI script runs for more than this many seconds without any 
 +output, it will be terminated and the connection will be shut down. 
 + 
 +=== HttpLogFile === 
 + 
 +Default value: ''../data/logs/http-'' 
 + 
 +The prefix of log files if HTTP_LOGGING is enabled (See next item) to 
 +store Common Logfile Format logs in.  The current virtual host 
 +(if enabled, see next item), date, and ''.log'' are appended to this (e.g.''http-2005-03-12.log''). 
 + 
 +=== Options === 
 + 
 +Default value: ''NO_HOST_LOOKUP'' 
 + 
 +The ''Options'' key is set to a ''|'' separated list of options to enable.  In addition to the [[config:sbbs.ini|standard options]], the web server also supports the following: 
 + 
 +''DEBUG_RX'' 
 + 
 +Log all received data to the console log, as well as various 
 +extra bits related to receiving data. 
 + 
 +''DEBUG_TX'' 
 + 
 +Log all transmitted data except the reply body itself, as well 
 +as various extra bits of information related to transmitted 
 +data. 
 + 
 +''VIRTUAL_HOSTS'' 
 + 
 +Supports name-based virtual hosts.  If your system has multiple 
 +host names, you can have each host name return unique content 
 +depending on which hostname is used.  ie: if 
 +''freebsd.synchro.net'' and ''nix.synchro.net'' both resolved to your 
 +system, you could have FreeBSD-specific pages on one, and  
 +general *nix stuff on the other. 
 + 
 +A virtual host is added by simply putting the desired content 
 +into a sub-directory of [[#RootDirectory]] with the desired hostname 
 +ie: ''web/root/freebsd.synchro.net/'' if the browser doesn't send 
 +the request host name (very old browsers, or some automated 
 +tools) they will be served out of document root. 
 +It is therefore a good idea to put links to your various 
 +virtual hosts in an ''index.html'' page in [[#RootDirectory]] something 
 +like this: 
 +<code html> 
 +<html> 
 +  <head> 
 +    <title>Old Browser</title> 
 +  </head> 
 +  <body> 
 +    Your browser is either too old to support 
 +    name-based virtual hosts, or you have visited a 
 +    virtual hosts that is not yet configured.  The 
 +    following are hosted here:<br> 
 +    <a href="freebsd.synchro.net">freebsd.synchro.net</a><br> 
 +    <a href="nix.synchro.net">nix.synchro.net</a><br> 
 +  </body> 
 +</html> 
 +</code> 
 + 
 +''NO_CGI'' 
 + 
 +Disable CGI script execution. 
 + 
 +''HTTP_LOGGING'' 
 + 
 +Enable logging to a Common Logfile Format log as described in 
 +the HttpLogFile section.  Usefull for running log analysis 
 +programs (like Webalizer: http://www.mrunix.net/webalizer/) 
 + 
 +''NO_JAVASCRIPT'' 
 + 
 +Disable SSJS execution. 
 + 
 +''ALLOW_TLS'' 
 + 
 +Enable TLS support. 
 +==== Other configuration files ==== 
 + 
 +In addition to the ''[Web]'' keys in the [[config:sbbs.ini]] file, the web server 
 +also uses some other configuration files: 
 + 
 +=== ctrl/mime_types.ini === 
 +Contains the file extension to mime-type mapping.  Each line 
 +is in the format "extension = mime-type" ie: "html = text/html" 
 +The extensions are case-insensitive and do not include the '.'. 
 + 
 +=== ctrl/webicons.ini === 
 +Contains the URLs to the icons used by the default 404.ssjs 
 +script for each file type/extension.  Format is "extension = URL". 
 +Example: "html=/icons/layout.gif".  Two "magical" extensions exist: 
 +DIRECTORY which is used for directories and DefaultIcon which 
 +is used for extensions which don't exist in the list. 
 + 
 +=== ctrl/web_handler.ini === 
 + 
 +This file contains 2 sections where a list of file 
 +extensions and their associated content-creation handlers are 
 +specified: 
 + 
 +== [CGI] == 
 + 
 +The [CGI] section is for natively-executed CGI handlers 
 +(e.g. "pl = perl" indicates "perl" will be used to handle ".pl" files).   
 + 
 +== [JavaScript] == 
 + 
 +The [JavaScript] section is used for JS-executed content 
 +handlers (e.g. "xjs = xjs_handler.js"). 
 + 
 +=== ctrl/cgi_env.ini === 
 +Contains a list of system environment variables to pass to CGI 
 +processes.  Each variable can have an optionally specified default 
 +value, over-ridden value, and prepended or appended text. 
 + 
 + 
 +==== webctrl.ini per-directory configuration file ==== 
 +Each directory under the [[#RootDirectory]] may have a ''webctrl.ini'' file which overrides certain settings for 
 +the directory it's in and all child directories.  Configuration keys may be set 
 +either globally, in a per-filename group, or, in version 3.17 or greater, a per-directory-name group. 
 +Using the * and ? wildcards as the group name such as ''[*.html]'' or ''[dirname/]''.  The following keys may be used in these files: 
 + 
 +=== AccessRequirements === 
 +Specifices an ARS string which all users must match to be able to access 
 +files in this directory.  Will force an HTTP login. 
 + 
 +For example, to require a login, but allow **any** user to access files in a 
 +directory, but only a sysop to access ''*.log'' files and .git directories, the following could be used: 
 +<file webctrl.ini> 
 +AccessRequirements=level 0 
 +[*.log] 
 +AccessRequirements=level 90 
 +[*.git] 
 +AccessRequirements=level 90 
 +</file> 
 + 
 +=== Realm === 
 +Sets the realm that is displayed to the user for the HTTP login. 
 +Default is the BBS name. 
 + 
 +=== DigestRealm === 
 +Sets the realm that is displayed to the user for the HTTP login when 
 +Digest authentication is being used.  Default is the [[#Realm]] value. 
 + 
 +=== Authorization === 
 +A comma-separated list of authentication mechanisms in order of 
 +preference.  The standards say that Basic must come first, but no 
 +browser currently appears to use Digest if Basic is listed first. 
 +Supported values are ''Basic'' and ''Digest''.  Digest is more secure as the 
 +users password is never sent over the wire. 
 + 
 +=== ErrorDirectory === 
 +Specifies a different directory to check for error pages.  If the error 
 +page is not found, will still check the global error directory. 
 + 
 +=== CGIDirectory === 
 +Specify an alternate CGI directory to check for CGI files. 
 + 
 +=== PathInfoIndex === 
 +Specifies that the index files can be ran for unlocated pages in the 
 +current directory.  This effecively works like a custom 404 page. 
 + 
 +=== FastCGISocket === 
 +Specifies the socket and port of a FastCGI listener in the <Address>:<Port> format (ie: 127.0.0.1:9000).  Should be used with wildcard sections like this: 
 +<file webctrl.ini> 
 +[*.php] 
 +FastCGISocket=127.0.0.1:9000 
 +</file> 
 + 
 +Added on November 1st, 2015 to CVS (in 3.17a). 
 + 
 +See [[howto:php]] for details on using with PHP. 
 + 
 +=== Rewrite* === 
 +Specifies a Javascript snippet which can modify the http_request.request_string.  This allows internal redirects like the RewriteRule feature in Apache .htaccess files.  The key must *begin* with the string "Rewrite" which may be followed by any legal INI key characters.  The order of execution is not guaranteed. 
 + 
 +Added on November 3rd, 2015 to CVS (in 3.17a). 
 + 
 +=== JSPreExec === 
 +A JavaScript snippet which is executed in the same context as Rewrite* lines, but before any Rewrites are executed.  This allows load()ing some common code before execution... ie: ''JSPreExec=load(js.startup_dir+'/rewrite_lib.js');''. 
 + 
 +Added on November 3rd, 2015 to CVS (in 3.17a). 
 + 
 +===== JavaScript Objects ===== 
 +In addition to the standard JavaScript objects, the web server provides the 
 +following: 
 + 
 +==== http_request object ==== 
 + 
 +The http_request object contains information from the client that was included 
 +during this request.  This objects properties are as follows: 
 + 
 +=== path_info === 
 +Contains extra path information that was included with the 
 +request AFTER the URI which identified this script.  For  
 +example, if the request was for 
 +''http://www.synchro.net/script.ssjs/test/this'' then path_info 
 +would contain the string "/test/this" 
 + 
 +=== method === 
 +Contains the HTTP method used to run the script.  As of this 
 +writing, the available methods are "HEAD", "GET", "POST", and 
 +"OPTIONS" 
 + 
 +=== virtual_path === 
 +The virtual path that this URI was reached by.  This is the 
 +portion of the URI from the end of the host to the end of the 
 +filename. 
 + 
 +=== query === 
 +This object contains the values of any form data which was 
 +submitted with the request.  This is an associative "array" of 
 +name/value pairs.  THE VALUES ARE ARRAYS OF STRINGS.  The reason 
 +for this is that it is legal and often useful to have multiple 
 +form fields with the same name. 
 + 
 +=== query_string === 
 +If a query string was included, this is the raw, unparsed query 
 +string. 
 + 
 +=== post_data === 
 +As with query_string but for data which was POSTed. 
 + 
 +=== header === 
 +An associative array of header name/value pairs. 
 + 
 +=== cookie === 
 +Much like the query object, this object contains key/value pairs 
 +of set cookies.  Once again, this is an array of strings since 
 +multiple values for the same key can be set for cookies. 
 + 
 +=== real_path === 
 +The real OS's complete path to this script. 
 + 
 +=== ars === 
 +The ARS string which applies to this request. 
 + 
 +=== request_string === 
 + 
 +The raw request string sent by the client. 
 + 
 +=== host === 
 +The value of the host header for this request. 
 +=== vhost === 
 +The virtual host serving this request. 
 +=== http_ver === 
 +The HTTP version used for this request as a string. 
 + 
 +=== remote_ip === 
 +The IP address of the client. 
 + 
 +=== remote_host === 
 + 
 +If the web server does host lookups (disabled by default), this 
 +is the remote hostname. 
 + 
 + 
 +==== http_reply object ==== 
 + 
 + 
 +The http_reply object is used to pass information about the reply back to the 
 +Synchronet web server.  The properties are as follows: 
 + 
 +=== status === 
 + 
 +HTTP status string.  The default is generally "200 Ok" 
 + 
 +=== header === 
 +An associative array of headers to include with the reply.  The 
 +only pre-defined one is "Content-Type" which defaults to "text/html". 
 + 
 +=== fast === 
 +This optional property can be set to "true" to make write()s go 
 +directly to the client for HTTP/1.0 connections.  This prevents 
 +keep-alives from working but generally appears faster to the 
 +client.  Since HTTP/1.1 requests use chunked mode, this isn't 
 +required for HTTP/1.1. 
 + 
 + 
 +==== Extra global methods ==== 
 + 
 +The web server also adds a new global JavaScript method that requests that the specified cookie be set: 
 + 
 +  set_cookie(string key,  
 +           string value  
 +    [, time_t expires  
 +    [, string domain  
 +    [, string path  
 +    [, bool secure ]]]]) 
 + 
 +===== The SSJS Template System ===== 
 +The default web pages use a SSJS Template engine which also allows for Theme  
 +support. 
 + 
 +[Note:  With this latest implementation of SSJS, @@ codes no longer can be nested.] 
 + 
 + 
 +==== The SSJS Template Scheme ==== 
 + 
 +Each page consists of four parts: 
 + 
 +=== The Header  === 
 +  ../web/templates/default/header.inc   
 + 
 +This file contains the basic requirements for the HTML page. 
 +The opening HTML, doctype, title, CSS file link, etc.  The 
 +header file includes the open body, System Name, and User  
 +greeting plus the initial page layout table start.  The rest 
 +of the layout is continued in the next files. 
 + 
 +=== Top Navigation === 
 + 
 +  ../web/templates/default/topnav.inc 
 +  ../web/lib/topnav_html.ssjs 
 + 
 +The ''topnav.inc'' file contains the basic design of the "breadcrumbs" 
 +The links are dynamically generated by ''topnav_html.ssjs'' so both 
 +files need to be addressed when modifying or creating themes. 
 +In the case of the default layout, ''topnav.inc'' has a left and right  
 +graphic and a middle section that the dynamic content goes.  The 
 +background image is handled by CSS.  You can change this to anything 
 +you like. 
 + 
 +The ''topnav_html.ssjs'' file may seem daunting at first, but it is  
 +pretty straight forward.  It has a series of if statements that 
 +check the current page location and sets up the breadcrumbs based 
 +on what you want it to say. 
 + 
 +For example: 
 +You want to add a Links page called links.html in the main  
 +directory.  You would add a check for the path to links.html 
 +as: 
 + 
 +<code javascript> 
 +if(http_request.virtual_path=="/links.html") 
 +    template.topnav.push({html: '<span class="tlink">Some Links</span>'}); 
 +</code>    
 +   
 +=== Left Side Navigation === 
 + 
 +  ../web/templates/default/leftnav.inc 
 +  ../web/lib/leftnav_nodelist.ssjs 
 +  ../web/lib/leftnav_html.ssjs 
 + 
 +This starts the main table layout in the default layout and also 
 +provides two other things -- the main navigation links and a brief 
 +nodelisting that displays when users are online via telnet. 
 +The links are dynamically created as in the Top Navigation example 
 +above with the exception of the two static links. 
 + 
 +=== Main Content (various files) === 
 + 
 +This is where the layout of the main content is created.  It is best 
 +to look at the various files in ''../web/templates/default'' &  
 +''../web/templates/default/msgs'' to see how the code is displayed for the 
 +various functions of the Web side of Synchronet.  Some details on what 
 +each of the special codes contained in those files do will follow. 
 + 
 +=== Footer === 
 +   
 +  ../web/templates/default/footer.inc 
 +   
 +This file contains the closing HTML and whatever bottom information 
 +you would like. In the case of the default layout, the 
 +Web Server/Synchronet versions and the XHTML 1.0 logo.  Links to 
 +privacy statements or anything else can be placed here and they will  
 +be displayed at the bottom of each page. 
 + 
 + 
 +==== SSJS Theme Support ==== 
 + 
 +Theme Layouts can be added to Synchronet by creating them and placing the 
 +*.inc files in their own directory under ../web/templates/ 
 + 
 +Themes are activated by editing the ../web/templates/html_themes.ssjs file. 
 +This file contains: 
 +<code javascript> 
 +/* Set default theme name */ 
 +var DefaultTheme="Default"; 
 + 
 +/* Edit this bit to add/remove/modify theme descriptions and dirs */ 
 +Themes["Default"]=new Object; 
 +Themes["Default"].desc="Default Synchronet Theme"; 
 +Themes["Default"].dir="default"; 
 +Themes["Default"].css="/synchronet.css";  
 +</code> 
 + 
 +Themes are added by editing below the Default Theme such as: 
 +<code javascript> 
 +Themes["CoolTheme"]=new Object; 
 +Themes["CoolTheme"].desc="My Cool Theme"; 
 +Themes["CoolTheme"].dir="cooltheme"; 
 +Themes["CoolTheme"].css="/cooltheme.css"; 
 +</code> 
 +To change the Default Theme, change: 
 + 
 +<code javascript> 
 +var DefaultTheme="Default"; 
 +</code>  
 +to: 
 +<code javascript> 
 +var DefaultTheme="CoolTheme"; 
 +</code> 
 + 
 +==== Special Codes Used in the SSJS Template System ==== 
 + 
 +By looking at at the message related files located in templates/default/msgs, 
 +it can be seen that some special codes are used to display dynamically created 
 +content. It is very important to maintain the information EXACTLY as seen in 
 +each file or else the messaging system will fail.  While how it is displayed 
 +can be changed, the correct information will only be dispayed by following the 
 +format in the *.inc files. 
 + 
 +For example the groups.inc: 
 +<code html> 
 +<!-- Main Content -->   
 +     
 +<td class="main" valign="top"><br /> 
 + 
 +<table class="grouplist" border="0" cellpadding="2" cellspacing="2"> 
 +<tr> 
 +<th class="grouplist">Message Group</th><th class="grouplist">Subs</th> 
 +</tr> 
 +<<REPEAT groups>> 
 +<tr> 
 +  <td class="grouplist"> 
 +      <a class="grouplist" href="subs.ssjs?msg_grp=^^groups:name^^"> 
 +          %%groups:description%%</a></td> 
 +  <td class="grouplist" align="right"> 
 +      @@JS:msg_area.grp_list[RepeatObj.index].sub_list.length@@</td> 
 +</tr> 
 +<<END REPEAT groups>> 
 +</table> 
 +<br /> 
 + 
 +<!-- end Main Content --> 
 +</code> 
 + 
 +While the table layout can be changed or even eliminated, the information 
 +within the <<REPEAT groups>> and <<END REPEAT groups>> must remain intact. 
 +To remove the table yet keep the correct infomation, the resulting groups.inc 
 +would be changed to (while maintaining the main table layout in this case) to: 
 +<code html> 
 +<!-- Main Content -->   
 +     
 +    <td class="main" valign="top"><br /> 
 + 
 +  <<REPEAT groups>> 
 +    <a class="grouplist" href="subs.ssjs?msg_grp=^^groups:name^^"> 
 +        %%groups:description%%</a> 
 +    @@JS:msg_area.grp_list[RepeatObj.index].sub_list.length@@<br /> 
 +  <<END REPEAT groups>> 
 + 
 +  <br /> 
 + 
 +  <!-- end Main Content --> 
 +</code> 
 + 
 +This principle applies to all the .inc files in msgs respectively. 
 + 
 +==== The SSJS Template Library ==== 
 + 
 +''%%name%%'' is replaced with the HTML encoded value of template.name 
 + 
 +i.e.; Spaces are replaced with: ''this&nbsp;is&nbsp;html'' 
 + 
 +''^^name^^'' is replaced with the URI encoded value of template.name 
 + 
 +i.e.; Spaces are replaced with:  ''this%20is%20URI'' 
 +           
 +''@@name@@'' is replaced with the value if ''template.name'' 
 + 
 +No changes or encoding is performed. 
 + 
 +''@@name:sname@@'' is replaced with the value of ''template.name.sname'' 
 +(^^ and %% are also supported) 
 + 
 +''@@JS:js_expression@@'' is replaced with the return value of ''js_expression'' 
 +(^^ and %% are also supported) 
 + 
 +<code javascript> 
 +<<REPEAT name>> 
 +  @@name:sname@@ 
 +<<END REPEAT name>> 
 +</code> 
 + 
 +Iterates over the array/object ''template.name'' and replaces ''name:sname'' with  
 +the value of ''template.name.sname''. 
 +(^^ and %% are also supported) 
 + 
 + 
 +==== SSJS Message Configuration ==== 
 + 
 +Configuration settings for the SSJS Messaging system is located in the 
 +''../web/lib/msgsconfig.ssjs'' file: 
 +<code javascript> 
 +max_messages=20; 
 +max_pages=30; 
 +next_msg_html="Next Message"; 
 +prev_msg_html="Previous Message"; 
 +next_page_html="NEXT"; 
 +prev_page_html="PREV"; 
 +showall_subs_enable_html="Show all subs"; 
 +showall_subs_disable_html="Show subs in new scan only"; 
 +show_messages_all_html="Show all messages"; 
 +show_messages_yours_html="Show messages to you only"; 
 +show_messages_your_unread_html="Show unread messages to you only"; 
 +show_messages_spacer_html="&nbsp;<b>|</b>&nbsp;"; 
 +anon_only_message="Message will be posted anonymously"; 
 +anon_allowed_message='<input type="checkbox" name="anonymous" value="Yes" /> Post message anonymously'; 
 +anon_reply_message='<input type="checkbox" name="anonymous" value="Yes" checked /> Post message anonymously'; 
 +private_only_message="Message will be marked private"; 
 +private_allowed_message='<input type="checkbox" name="private" value="Yes" /> Mark message as private'; 
 +private_reply_message='<input type="checkbox" name="private" value="Yes" checked /> Mark message as private'; 
 +</code> 
 + 
 +Each of these are configurable. 
 + 
 +See the actual file for the defaults currently in use. 
 + 
 +==== Embedded Javascript ==== 
 + 
 +The ''*.inc'' files can (and do in the default layout) have embedded JavaScript 
 +which is parsed by the JavaScript engine.  Care should be taken as a large 
 +number of embedded JavaScript in the *.inc files slow down overall processing 
 +of pages. 
 + 
 +Anything contained within ''@@JS: @@'' is processed by the Server-side JavaScript 
 +engine. 
 + 
 +For example, it can check if the user is Guest or an actual user with this line: 
 + 
 +<code javascript> 
 +@@JS:if(user.number==0 || user.security.restrictions&UFLAG_G) '<html code for Guest>'; \ 
 +else '<html code for registered user>';@@ 
 +</code> 
 +         
 +What this does is display links specific for Registered Users only to them 
 +and not Guest.  There are many things that can be done with ''@@JS: @@'' code. 
 +Note, it also can be used to display HTML based on location as in the 
 +node listing stuff. In this case, it checks for whether or not a user is 
 +online, or if the user is anywhere but the Who's Online page before displaying 
 +the Left side node listing. 
 + 
 +IMPORTANT!  Anything contained within ''@@JS: @@ MUST'' be on one line or there 
 +will be errors in parsing. 
 + 
 +==== global_defs.ssjs ==== 
 + 
 +This version of the Web Layout now includes a new file called 
 +''global_defs.ssjs''.  It is located in the ''../web/lib'' directory.  This file can 
 +be used for creating global definitions that span all pages of a site. 
 +For example: 
 + 
 +<code javascript> 
 +template.user_alias=user.alias; 
 +</code> 
 + 
 +Now ''@@user_alias@@'' can be in any ''*.inc'' template files and it will display the 
 +user's alias. 
 + 
 +Care should be exercised when using this file as loading it up with hundreds 
 +of predefined definitions may slow down overall page rendering as the file is 
 +loaded on every page.  It would be better to just put a few popular  
 +definitions that are truly global rather many definitions.  It would be 
 +inefficient to have thirty of forty message definitions being loaded when a 
 +user is looking at the statistics page. 
 + 
 + 
 +===== XJS files ===== 
 + 
 +XJS files, handled by ''exec/xjs_handler.js'' are what many people consider to be 
 +an easier method of generating SSJS files.  XJS files are HTML files with JS 
 +commands embedded in them using special tags much like PHP.  XJS files are 
 +translated on-the-fly to .ssjs files using the same name with ''.ssjs'' appended. 
 +For example, a file named test.xjs will, when ran, generate a ''test.xjs.ssjs'' 
 +file. 
 + 
 + 
 +==== XJS syntax ==== 
 + 
 +In an XJS file, everything not within a special xjs tag is send to the remote 
 +host unmodified, and everything inside the xjs tag is interpreted as JS 
 +statements to be executed at that point in the file.  The xjs tag begins with 
 +either "<?xjs" or "<?" and ends with "?>".  A simple example would be: 
 + 
 +<code html> 
 +<html><head><title><?xjs write(system.name) ?></title></head> 
 +<body> 
 +Your SysOp "<?xjs write(system.operator) ?>" welcomes you to 
 +<?xjs write(system.name) ?> 
 +</body> 
 +</html> 
 +</code> 
 + 
 +This would send the following web page to the remote system: 
 +<code html> 
 +<html><head><title>My Brand New BBS</title></head> 
 +<body> 
 +Your SysOp "Sysop" welcomes you to 
 +My Brand New BBS 
 +</body> 
 +</html> 
 +</code> 
 + 
 +Looping constructs are permitted, however, not using brackets can result in 
 +unexpected effects.  Because of this, it is reccomended to *always* use 
 +brackets with looping and flow control items. 
 + 
 +The following example displays the numbers from one to 10. 
 +<code html> 
 +<html><head><title>Counter</title></head> 
 +<body> 
 +<?xjs 
 +var i; 
 +for(i=1; i<=10; i++) { 
 +?> 
 +<?xjs write(i) ?><br> 
 +<?xjs } ?> 
 +</body> 
 +</html> 
 +</code> 
 + 
 +==== XJS-specific global methods and properties ==== 
 + 
 +The following JavaScript methods and properties are available to XJS files only. 
 + 
 +=== xjs_load(filename) === 
 +Runs the specified xjs file at the current position.  Local variables 
 +are NOT visible to ''xjs_load()''ed pages.  The filename is assumed to be 
 +relative to the including file (or absolute.) 
 + 
 +=== cwd === 
 +Contains the path that the current xjs script was loaded from and which 
 +parameters to ''xjs_load()'' are assumed to be relative to.  If you change 
 +the value of ''cwd'', it will change the location where ''xjs_load()'' will 
 +check for files. 
 + 
 +{{indexmenu_n>4}}
  

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