#!/usr/local/plan9/bin/rc
. ./cgilib.rc
cd ..

forbidden_uri_chars='[^a-zA-Z0-9_+\-\/\.]'
response_format=html

fn get_lib_file {
    if(test -f $sitedir/_werc/lib/$1)
    	echo -n $sitedir/_werc/lib/$1
    if not if(! ~ $#masterSite 0 && test -f $sitesdir/$masterSite/_werc/lib/$1)
    	echo -n $sitesdir/$masterSite/_werc/lib/$1
    if not if(test -f lib/$1)
    	echo -n lib/$1
}

# Title
fn gentitle {
    echo '<h1 class="headerTitle"><a href="/">' ^ $"siteTitle ^ ' <span id="headerSubTitle">' ^ $"siteSubTitle ^ '</span></a></h1>'
}

# Don't change var name or trailing ';', dirfilter might be changed from _werc/config!
# TODO: Specify the canonical path input format handled by dirfilter
dirfilter='s/\*$//; s,/+\./+,/,g; /\/[._]/d; /'^$forbidden_uri_chars^'/d; /^\/(robots|sitemap)\.txt$|\/index\.(md|html|txt|tpl)$/d; /_werc\/?$/d; s,^\./,,; s,\.(md|html|txt)$,,; '

# To be used from config files
fn hide_paths {
    for(i in $*)
       dirfilter=$dirfilter^'/^'$i'$/d; '
}

# Sidebar 
fn gensidebar {
    for(d in ./ $args) {
       dd=$"dd^'/'^$d
       dirs=( $sitedir^$dd $dirs )
    }
    # Ignore stderr, last item in path might be a file that doesn't exist (eg., foo for foo.md)
    ls -F $dirs >[2]/dev/null | sed 's,^'$sitedir',,; '^$dirfilter | sort -u | awk -F/ ' 
    function p(x, y, s) {
        for(i=0; i < x-y; i+=1)
            print s 
    }

    # XXX Regexp to hide non-document/non-dir stuff, there must be a better way, if we really want this.
    /^\/([a-zA-Z0-9+_\-]+[*\/]?)+$/ { 

        d = ""
        if(match($0, "/$"))
            d = "/"
        sub("/$", "") # Strip trailing / for dirs so NF is consistent 

        p(NF, lNF, "<ul class=\"side-bar\">")
        p(lNF, NF, "</ul>")
        lNF = NF

        bname = $NF d
        path = $0 d
        gsub("_", " ", bname)

        if(index(ENVIRON["REQUEST_URI"] "/", path) == 1)
            print "<li><a href=\"" path "\" class=\"thisPage\">&raquo;<i> " bname "</i></a>"
        else 
            print "<li><a href=\"" path "\">&rsaquo; " bname "</a></li>"
    }
    END { p(lNF, 0, "</ul>") }
    '
}


# Handlers
fn set_handler {
    handler=$1
    handler_args=$*(2-)
}

fn md_handler { cat $* | $formatter }

fn tpl_handler { template $1 }

fn html_handler {
    cat $1 | /bin/sed '0,/<[Bb][Oo][Dd][Yy][^>]*>/d; /<\/[Bb][Oo][Dd][Yy]>/,$d' 
}

fn txt_handler {
    echo '<pre>'
    # XXX Insering a blank line between lines in input is good for fortunes.txt, but maybe not for other .txt files
    # XXX Words are not broken, even if they are way beyond 82 chars long
    cat $1 | sed 's/$/\n/g; s/</\&lt;/g; s/>/\&gt;/g' | fmt -l 82 -j
    echo '</pre>'
}

fn dir_listing_handler {
    d=`{basename -d $1}
    echo $d|sed 's,.*//,,g; s,/$,,; s,/, / ,g; s,.*,<h1 class="dir-list-head">&</h1> <ul class="dir-list">,'
    # Symlinks suck: '/.' forces ls to list the linked dir if $d is a symlink.
    ls -F $d/. | sed $dirfilter' s,.*/([^/]+/?)$,<li><a href="\1">\1</a></li>,'
    echo '</ul>'
}

fn 404_handler { template `{ get_lib_file 404.tpl } }

fn blog_dir_handler {
    blogDirs=$*
    tpl_handler lib/feeds/html.tpl
}

fn blog_post_handler {
    gen_blog_post_title $1 | $formatter
    $formatter < $1
}


fn select_handler {

    if(test -f $body.md) {
        if(! ~ $#inBlog 0)
            set_handler blog_post_handler $body.md
        if not
            set_handler md_handler $body.md
        if(! ~ $#allowComments 0 && ~ $REQUEST_METHOD POST) {
            get_post_args comment_text
            d=`{date -n} # FIXME Obvious race
            d=$body.md_werc/comments/$d/

            u=$logged_user
            if(~ $#logged_user 0) {
                get_post_args comment_user_name comment_user_password
                # TODO Should take this path too if the user can login but doesn't
                # belong to required group
                if(! login_user $comment_user_name $comment_user_password) {
                    u=$comment_user_name ':' $comment_user_password
                    d=$d^'_pending'
                }
                if not
                    u = $logged_user
            }

            umask 002
            mkdir -m 775 -p $d
            echo $u > $d/user
            echo $comment_text > $d/body
        }
    }
    if not if(test -f $body.tpl)
        set_handler tpl_handler $body.tpl

    if not if(test -f $body.html)
        set_handler html_handler $body.html

    # Explicit .html urls, unfortunately usually the web server will handle this as static files
    if not if(~ $body *.html && test -f $body)
        perm_redirect `{ echo $REQUEST_URI|sed 's/.html$//' }

    # Rss feeds. TODO: we should check that the request is for a real blog dir
    if not if(~ $REQUEST_URI */index.rss */index.atom) {
        response_format=raw
        uri=`{echo $uri | sed 's/index.(rss|atom)$//'}
        if(~ $#blogDirs 0)
            blogDirs=$sitedir^'/'$uri
        uri=$baseuri$"uri

        if(~ $REQUEST_URI */index.rss)
            master_template=feeds/rss20.tpl
        if not if(~ $REQUEST_URI */index.atom)
            master_template=feeds/atom.tpl
    }

    # Blog handler
    if not if(~ $body */[bB]log/index */[bB]log//index || ! ~ $#blogDirs 0) {
        if(~ $#blogDirs 0)
            blogDirs=`{basename -d $body}

        u=`{cleanname $baseuri^`{basename -d '/'^$uri}|sed 's,:/,://,'} # Sed recovers '/' in 'http:/' stripped by cleanname
        extraHeaders=$"extraHeaders ^ \
    	'<link rel="alternate" type="application/rss+xml" title="RSS" href="'$"u'/index.rss" />
<link rel="alternate" type="application/atom+xml" title="ATOM" href="'$"u'/index.atom" />'
        set_handler tpl_handler lib/feeds/html.tpl
    }

    # Global tpl (eg sitemap.tpl)
    if not if(test -f lib/^$uri^.tpl)
        set_handler tpl_handler lib/^$uri^.tpl

    if not if(test -f $body.txt)
        set_handler txt_handler $body.txt

    # Dir listing
    if not if(~ $body */index)
        set_handler dir_listing_handler $body

    # Apps
    if not if(select_apps)
        set_handler app_handler

    # File not found
    if not {
        set_handler 404_handler $body
        dprint 'NOT FOUND: '$SERVER_NAME^$REQUEST_URI^' - '^$"HTTP_REFERER^' - '^$"HTTP_USER_AGENT
        echo 'Status: 404 Not Found'
    }

}

fn genbody { $handler $handler_args }

# Careful, the proper p9p path might not be set until initrc.local is sourced
path=(. $PLAN9/bin ./bin/ /bin/ /usr/bin) 

site=$SERVER_NAME
headers=lib/headers.tpl
master_template=default_master.tpl
sidebar=sidebar
baseuri=http://$site/
for(i in siteTitle siteSubTitle pageTitle extraHeaders)
    $i = ''

. ./etc/initrc

if(test -f etc/initrc.local)
    . ./etc/initrc.local


# Parse request URL
uri=`{echo -n $REQUEST_URI | sed 's/\?.*//; s/'^$forbidden_uri_chars^'//g; s/\.\.*/./g; 1q'}
ifs='/' { args=`{echo -n $uri} }


if(! ~ $#debug 0)
    dprint '  ' $SERVER_NAME^$REQUEST_URI^' - '^$"HTTP_USER_AGENT

# Hack: preload post data so we can access it from templates where cgi's stdin is not accesible
if(~ $REQUEST_METHOD POST) {
    get_post_args 
    login_user
}

if(! ~ $args '') {
    if(~ $args($#args) 'index')
        perm_redirect `{echo $REQUEST_URI | sed 's,/index$,/,'}
        
    pageTitle=`{echo $args | sed -e 's/ / - /g' -e 's/_/ /g'}
    req_path=$uri
}
if not {
    req_path='/'
}

fpath=$sitedir
for(i in ('' $args)) {
    # TODO We can build a list of paths here that can be used in sidebar, instead of iterating args twice
    fpath=$fpath/$i
    # We don't want blog settings to cascade into posts, note that we are inBlog instead
    if(! ~ $#blogDirs 0 && ! ~ $req_path */index.rss */index.atom */[bB]log */[bB]log/) {
        inBlog = $blogDirs
        blogDirs = () 
    }

    if(test -f $fpath/_werc/config)
        . ./$fpath/_werc/config

    if(~ $#blogDirs 0 && ~ $#inBlog 0 && ~ $i [Bb]log)
        inBlog = 'yes'
}

# Redirections and other preprocessing
if(~ $#redirectPermanent 1)
    perm_redirect $"redirectPermanent

if not if(~ $#redirectPermanent 2 && {echo $SERVER_NAME^$REQUEST_URI|grep -s $redirectPermanent(1) }) {
    # Experimental regexp sub-based redirect, probably should find a nicer interface
    to=`{echo $SERVER_NAME^$REQUEST_URI|sed 's@'^$redirectPermanent(1)^'@'^$redirectPermanent(2)^'@'}
    if(! ~ $to $REQUEST_URI)
        perm_redirect $to
}

# Set Page title
if(~ $pageTitle '')
	pageTitle=$siteTitle^' '^$siteSubTitle
if not
	pageTitle=$"pageTitle^' | '^$"siteTitle^' '^$"siteSubTitle


body=$sitedir/$req_path
if(test -d $body) {
    if(! ~ $body */)
    	perm_redirect $REQUEST_URI^'/'
    body=$body/index
}

select_handler

dprint $handler

# Template/body selection
master_template=`{get_lib_file $master_template}

if(~ $response_format html) {
    # Is awk_buffer really useful?
	template $headers $master_template | awk_buffer
	echo '</body></html>'
}
if not if(~ $response_format raw)
	template < $master_template