/prog/reader webserver

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#!/bin/bash
set -e
set -o pipefail

DATABASE="prog.db"
PROGSCRAPE_CMDLINE=("./progscrape.py" "--no-progress" "$DATABASE")
BIND_TO="localhost"
PORT="8000"
MAXRESULTS="100"

dn="/dev/null"
self="$(readlink -f "$0")"
cd "$(dirname "$self")"

ignorefail(){ "$@";return;}
escapehtml(){ sed -e's/</</g;s/>/>/g;s/&/&/g;s/"/"/g;';}
http() {
    local status
    if [ $# = 1 ]; then
        status="200 OK"
    else
        status="$2"
    fi
    echo -e "HTTP/1.0 $status\nContent-Type: $1\n"
}
handler() {
    local q="$(echo "$1" | cut -d' ' -f2)"
   
    case "$q" in
        /)
            index-handler
            return
            ;;
        /q/*)
            search-handler "${q:3}"
            return
            ;;
        /update)
            update-handler
            return
            ;;
        /update-status)
            update-status-handler
            return
            ;;
        *)
            http "text/plain" "403 Forbidden"
            echo "Fuck you."
            ;;
    esac
}
page-header() {
    http "text/html"
    if [ -n "$1" ]; then
        DISABLED="readonly='readonly'"
    fi
    echo "
<html><head>
<link rel='stylesheet' href='http://dis.4chan.org/skin/world4ch/global.css'/>
<link rel='stylesheet' href='http://dis.4chan.org/skin/world4ch/0ch.css' media='screen' />
$2
<style type='text/css'>
#sb{margin-left:auto;margin-right:auto;background-color:#ffffff;border:1px solid #000090;width:90%;display:block;}
#sbd{background-color:#dfdfdf;width:100%;padding:10px;}
body{padding:0px;margin:0px;}
#r{background-color:#efefef;padding:10px;}
</style>
<script type='text/javascript'>
function E(s){return document.getElementById(s);}
function submit(){
  var x=E('sb').value;
  if(x==',update'){
    document.location='/update';
    return;}
  document.location='/q/'+encodeURIComponent(x);}
function initsb(){
  E('sb').focus();
  var x=document.location.toString();
  var i=x.search('/q/');
  if(i==-1)return;
  E('sb').value=decodeURIComponent(x.substring(i+3));}
</script>
</head>
<body>
<div id='sbd'><input type='text' id='sb' value='$1' onkeypress='if(event.keyCode==13)submit();' $DISABLED onload='initsb()' /></div>
<script type='text/javascript'>initsb();</script>
"
}
index-handler() {
    page-header
    echo "<div id='r'><p>Protips:</p><ul><li>Use commas to separate your search strings</li>"
    echo "<li>To update your progscrape db, type in \",update\".</li>"
    echo "<li>To see the latest posts, just submit an empty string.</li></ul></div></body></html>"
}
search-handler() {
    page-header
    echo "<div id='r'>"
    echo -n "$1" | python -c "
import sys,sqlite3,datetime,urllib;db=sqlite3.connect('${DATABASE}');c=db.cursor()
t=filter(len,map(lambda s:\"%%%s%%\"%s,urllib.unquote_plus(sys.stdin.read()).decode('utf-8').split(',')))
q=u'SELECT thread,id,author,trip,time,body FROM posts WHERE 1=1' + u' AND body LIKE ?'*len(t) + u' ORDER BY time DESC LIMIT $MAXRESULTS'
for r in c.execute(q,t):
 thread,id,author,trip,time,body=r
 print (u\"<div class='post odd'><h3><span class='postnum'><a href='http://dis.4chan.org/read/prog/%d/%d,-'>%d</a> </span><span class='postinfo'><span class='namelabel'> Name: </span><span class='postername'>%s</span><span class='postertrip'>%s</span> : <span class='posterdate'>%s</span> <span class='id'> </span></span></h3><blockquote>%s</blockquote></div>\" % (thread,id,id,author if isinstance(author,unicode) else u'NULL',trip if isinstance(trip,unicode) else u'',datetime.datetime.fromtimestamp(time).strftime(u'%F %T') if isinstance(time,int) or isinstance(time,long) else 'NULL',body.replace(u'<a href=\"read/prog/','<a href=\"//dis.4chan.org/read/prog/'))).encode('utf-8')
" 2>/dev/null || true
    echo "</div></body></html>"
}
update-handler() {
    if mkdir "$progscrape_lock"; then (
            "${PROGSCRAPE_CMDLINE[@]}" > "$progscrape_output_file" || true
            rmdir "$progscrape_lock";) <$dn >$dn 2>$dn &
    fi
   
    echo -e "HTTP/1.1 200 ok\nRefresh: 0; url=/update-status\n"
}
print-update-status() {
    echo "<div id='r'><pre>"
    ignorefail cat "$progscrape_output_file" | escapehtml | sed -e's#\n#<br/>#g'
    echo "</pre></div></body></html>"
}
update-status-handler() {
    if [ -d "$progscrape_lock" ]; then
        page-header "updating database, please wait..." "<meta http-equiv='refresh' content=\"1;URL='/update-status'\" >"
    else
        page-header
    fi
   
    print-update-status
}
if [ "${__CALLED_BY_SOCAT}" = "definitely" ]; then
    t="${__CALLED_BY_SOCAT_DIR}"
    progscrape_output_file="$t/progscrape_output"
    progscrape_lock="$t/progscrape_lock"
    read firstline
    echo "$firstline" >&2
    handler "$firstline"
else
    t="$(mktemp -d)"
    env __CALLED_BY_SOCAT=definitely __CALLED_BY_SOCAT_DIR="$t" socat -d -b 256 TCP-LISTEN:"$PORT",bind="$BIND_TO",fork,reuseaddr EXEC:"$self"
fi