File:  [LON-CAPA] / doc / gutshtml / SessionTwo.html
Revision 1.2: download - view: text, annotated - select for diffs
Tue Jul 22 14:47:00 2003 UTC (19 years, 2 months ago) by bowersj2
Branches: MAIN
CVS tags: version_2_9_X, version_2_9_99_0, version_2_9_1, version_2_9_0, version_2_8_X, version_2_8_99_1, version_2_8_99_0, version_2_8_2, version_2_8_1, version_2_8_0, version_2_7_X, version_2_7_99_1, version_2_7_99_0, version_2_7_1, version_2_7_0, version_2_6_X, version_2_6_99_1, version_2_6_99_0, version_2_6_3, version_2_6_2, version_2_6_1, version_2_6_0, version_2_5_X, version_2_5_99_1, version_2_5_99_0, version_2_5_2, version_2_5_1, version_2_5_0, version_2_4_X, version_2_4_99_0, version_2_4_2, version_2_4_1, version_2_4_0, version_2_3_X, version_2_3_99_0, version_2_3_2, version_2_3_1, version_2_3_0, version_2_2_X, version_2_2_99_1, version_2_2_99_0, version_2_2_2, version_2_2_1, version_2_2_0, version_2_1_X, version_2_1_99_3, version_2_1_99_2, version_2_1_99_1, version_2_1_99_0, version_2_1_3, version_2_1_2, version_2_1_1, version_2_1_0, version_2_12_X, version_2_11_X, version_2_11_4_uiuc, version_2_11_4_msu, version_2_11_4, version_2_11_3_uiuc, version_2_11_3_msu, version_2_11_3, version_2_11_2_uiuc, version_2_11_2_msu, version_2_11_2_educog, version_2_11_2, version_2_11_1, version_2_11_0_RC3, version_2_11_0_RC2, version_2_11_0_RC1, version_2_11_0, version_2_10_X, version_2_10_1, version_2_10_0_RC2, version_2_10_0_RC1, version_2_10_0, version_2_0_X, version_2_0_99_1, version_2_0_2, version_2_0_1, version_2_0_0, version_1_99_3, version_1_99_2, version_1_99_1_tmcc, version_1_99_1, version_1_99_0_tmcc, version_1_99_0, version_1_3_X, version_1_3_3, version_1_3_2, version_1_3_1, version_1_3_0, version_1_2_X, version_1_2_99_1, version_1_2_99_0, version_1_2_1, version_1_2_0, version_1_1_X, version_1_1_99_5, version_1_1_99_4, version_1_1_99_3, version_1_1_99_2, version_1_1_99_1, version_1_1_99_0, version_1_1_3, version_1_1_2, version_1_1_1, version_1_1_0, version_1_0_99_3, version_1_0_99_2, version_1_0_99_1, version_1_0_99, version_1_0_3, version_1_0_2, version_1_0_1, version_1_0_0, version_0_99_5, version_0_99_4, loncapaMITrelate_1, language_hyphenation_merge, language_hyphenation, bz6209-base, bz6209, HEAD, GCI_3, GCI_2, GCI_1, BZ4492-merge, BZ4492-feature_horizontal_radioresponse, BZ4492-feature_Support_horizontal_radioresponse, BZ4492-Support_horizontal_radioresponse
Convert GUTs HTML to PROPER line endings.

<html>
<head>
<meta name=Title content="Session Two: Apache Handlers (loncapa_apache">
<meta http-equiv=Content-Type content="text/html; charset=macintosh">
<title>Session Two: Apache Handlers (loncapa_apache</title>
<style><!--
.Section1
	{page:Section1;}
.Section2
	{page:Section2;}
-->
</style>
</head>
<body bgcolor=#FFFFFF class="Normal" lang=EN-US>
<div class=Section1> 
  <h2>Session Two: Apache Handlers (loncapa_apache.conf), Authentication and Access 
    Control, Session Environment (Matthew)</h2>
  <h3><a name="_Toc470397993"></a><a name="_Toc514840845"></a><a
name="_Toc421867046"><span>Server Content Resource Areas</span></a></h3>
  <p>Internally, all resources are identified primarily by their URL.&nbsp; Different 
    logical areas of the server are distinguished by the beginning part of the 
    URL: </p>
  <ul type=disc>
    <li><span
     style='font-family:"Courier New"'>/adm: </span>publicly available content, 
      logos, manual pages, etc.<i></i></li>
  </ul>
  <ul type=disc>
    <li><span
     style='font-family:"Courier New"'>/res/<i>domainname</i></span><span
     style='font-family:"Courier New"'>/<i>authorname</i></span><span
     style='font-family:"Courier New"'>/..: </span>the resource area, holding 
      course maps, HTML pages, homework, movies, applets, etc. Access to these 
      files is restricted by the cookie-based authentication mechanism. Content 
      in this area will be served by type-dependent handlers, for example, one 
      handlers to serve homework problems, and another one for TeX resources. 
      The structure of this area of the server is exactly the same on every server, 
      even though not all resources might be present everywhere.</li>
  </ul>
  <ul type=disc>
    <li><span
     style='font-family:"Courier New"'>/raw/<i>domainname</i></span><span
     style='font-family:"Courier New"'>/<i>authorname</i></span><span
     style='font-family:"Courier New"'>/..: </span>internally, this is just a 
      symbolic link to the <span style='font-family:"Courier New"'>res</span> 
      directory, however, no content handlers are called when serving a resource 
      and access is controlled by IP rather than cookies. This structure is used 
      for replication of resources between servers.</li>
  </ul>
  <ul type=disc>
    <li><span
     style='font-family:"Courier New"'>/~<i>authorname</i></span><span
     style='font-family:"Courier New"'>/.., /priv<i>/authorname</i></span><span
     style='font-family:"Courier New"'>: </span>the content construction space.<span
     style='font-family:"Courier New"'> </span>This is normal UNIX filespace, 
      which however can only by viewed on the web by the authors themselves through 
      the cookie based authentication. Content handlers are active for this space. 
      This space can be mounted on other UNIX machines, as well as AppleShare 
      and Windows. Below the <span style='font-family:"Courier New"'><i>authorname</i></span>, 
      this directory has the same structure as the resource space of the author.</li>
  </ul>
  <ul type=disc>
    <li><span
     style='font-family:"Courier New"'>/lon-status/..: </span>LON-CAPA status 
      information – behind basic http authentication so it is not dependent on 
      system functions</li>
  </ul>
  <p>Authors can only write-access the<i> </i><span
style='font-family:"Courier New";font-style:normal'>/~</span><span
style='font-family:"Courier New"'><i>authorname</i></span><span
style='font-family:"Courier New"'>/</span> space. They can copy resources into 
    the resource area through the publication step, and move them back through 
    a retrieve step. Authors do not have direct write-access to their resource 
    space.</p>
  <h3><a name="_Toc514840846"></a><a name="_Toc421867047">Apache Request Cycle 
    and Handlers</a></h3>
  <p>The standard mode in which the Apache web server is used is that a URL corresponds 
    to some static file on the file system, which then more or less gets sent 
    out as-is. Slight deviations from that simple principle are however already 
    the directory listing function, virtual servers, and the cgi-bin directory. 
    In the latter case, Apache executes the file in a new process and provides 
    both the input to the process in the environment, and routes the output to 
    the client. Other deviations are the error messages.</p>
  <p>In a more general view, URLs to Apache are URIs (Uniform Resource Identifiers), 
    which may are may not correspond to a physical file, which in turn may or 
    may not be sent out as-is.</p>
  <p>As a request for a URI gets sent to the Apache server, it goes through several 
    phases. At each phase (“stage”) along the process, handler modules can be 
    defined to deal with the request. Details about these phases are given in 
    the Eagle book Chapter 3 (page 60).</p>
  <p>These handler modules are not like cgi-scripts executed in a separate process, 
    but are dynamically linked into the Apache child processes themselves – they 
    run inside of Apache. The mod_perl mechanism in addition links the Perl interpreter 
    into the Apache child process. Modules are pre-interpreted (“compiled”) by 
    the Perl interpreter when they are first loaded, and the pre-interpreted code 
    stays permanently in the memory allocated to that Apache child process. The 
    result is a significant speed-up, and through the flexible mechanism of module 
    registration and different stages of the process, a high degree of customizability.</p>
  <p>LON-CAPA does not use Apache::Registry, and so in addition avoids the unnecessary 
    overhead of emulating a cgi-environment within the handlers. Instead, it makes 
    direct use of the Apache Perl API (Chapter 9, Eagle book).&nbsp; </p>
  <h3><a name="_Toc514840847"></a><a name="_Toc421867048">Handler Definition</a></h3>
  <p>Which chain of handler deals with which kind of resource is defined in <span style='font-size:9.0pt;font-family:"Courier New"'>/etc/httdp/conf/loncapa_apache.conf</span>. 
    LON-CAPA only defines handlers at the (in order) header-parser, access control, 
    and response phase (figure 3-3 Eagle book). In the header-parser phase, the 
    replication handler is run, and in the access-control phase, the various access-handlers. 
    Future handlers will mostly be implemented in the response phase.<b> Fig. 
    1.2.2</b><span style='font-weight:normal'> shows excerpts of the configuration 
    script </span><span style='font-size:9.0pt;font-family:"Courier New"'>/etc/httpd/loncapa_apache.conf</span> 
    for these modules.</p>
  <div style='border:solid windowtext .5pt;padding:31.0pt 31.0pt 31.0pt 31.0pt'> 
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'># ------------------------------------------------------------- 
      Access Handlers</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/res.*&quot;&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      Apache::lonacc</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHeaderParserHandler Apache::lonrep</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      403 /adm/login</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      404 /adm/notfound.html</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      406 /adm/roles</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      500 /adm/errorhandler</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/priv.*&quot;&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler Apache::loncacc</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      Apache::lonconstruct</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      403 /adm/login</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      404 /adm/notfound.html</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      406 /adm/unauthorized.html</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      500 /adm/errorhandler</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/raw.*&quot;&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler Apache::lonracc</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/\~.*&quot;&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler Apache::loncacc</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      403 /adm/login</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      404 /adm/notfound.html</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      406 /adm/unauthorized.html</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      500 /adm/errorhandler</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>AllowOverride None</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:20.0pt;font-family:"Courier New"'><b>…</b></span><span
style='font-size:16.0pt;font-family:"Courier New"'></span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'># --------------------------------------------- 
      Resource Space Content Handlers</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/res/.*/$&quot;&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lonindexer</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/res/.*\.tex$&quot;&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lontex</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/res/.*\.page$&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lonpage</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:20.0pt;font-family:"Courier New"'><b>…</b></span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/(res|\~).*\.(xml|html|htm|xhtml|xhtm)$&quot;&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lonxml</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;LocationMatch &quot;^/(res|\~).*\.(problem|exam|quiz|assess|survey|form)$&quot;&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lonhomework</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/LocationMatch&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'># -------------------------------------------------------------- 
      Admin Programs</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;Location /adm/roles&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      Apache::lonacc</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lonroles</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      403 /adm/login</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      500 /adm/errorhandler</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/Location&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;Location /adm/login&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lonlogin</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/Location&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:20.0pt;font-family:"Courier New"'><b>…</b></span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;Location /adm/annotations&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      Apache::lonacc</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::admannotations</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      403 /adm/login</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument&nbsp;&nbsp;&nbsp;&nbsp; 
      500 /adm/errorhandler</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>&lt;/Location&gt;</span></p>
    <p style='border:none;padding:0in;'><span
style='font-size:14.0pt;font-family:"Courier New"'><b>… etc …</b></span></p>
  </div>
  <p><span style='font-size:14.0pt'><b>Fig. 1.2.2</b></span><span
style='font-size:14.0pt'> – Excerpts of </span><span style='font-size:14.0pt;
font-family:"Courier New"'>loncapa_apache.conf</span></p>
  <h3><a name="_Toc514840849"></a><a name="_Toc421867049">Authentication Overview</a></h3>
  <p>A user can log into any server in the network and run sessions. The server 
    responsible for initially authenticating the user is the user’s homeserver.</p>
  <p>When a user first accesses a server within a browser session, he or she is 
    challenged to provide authentication information in the form of username, 
    password and domain – this is done by <span style='font-family:
"Courier New"'>lonlogin</span>, which is the <span style='font-family:"Courier New"'>error_document</span> 
    for <span style='font-family:"Courier New"'>lonacc</span> and <span
style='font-family:"Courier New"'>loncacc </span>(the normal authentication handlers). 
    When the server receives that information, it asks all library servers in 
    the domain that the user specified to validate the information – this is done 
    by <span style='font-family:"Courier New"'>lonauth</span>. </p>
  <p>The user’s home server will answer with<i> </i><span
style='font-family:"Courier New";font-style:normal'>authorized</span> or <span
style='font-family:"Courier New"'>non_authorized</span>, all others with <span
style='font-family:"Courier New"'>unknown_user</span>. If one server authorizes 
    the user, a cookie is returned to the user by <span style='font-family:"Courier New"'>lonauth</span> 
    and the session is initialized on the local server by establishing the session 
    environment file. If a server sends<i> </i><span style='font-family:"Courier New";
font-style:normal'>non_authorized</span>, the user is rejected.&nbsp; <b>Fig. 
    1.3.1</b><span
style='font-weight:normal'> illustrates this process.</span></p>
</div>
<br
clear=ALL style='page-break-before:always;'>
<div class=Section2>
  <div class=Section3>
    <div style='border:solid windowtext .5pt;padding:1.0pt 4.0pt 1.0pt 4.0pt'>
      <p style='border:none;padding:0in'>Domain</p>
      <p style='border:none;padding:0in'> <span style='font-family:Wingdings'>ą</span> 
        username, password <span style='font-family:Wingdings'>ą</span> <b>Library 
        Server</b></p>
      <p style='border:none;padding:0in'> | <span style='font-family:Wingdings'>ß</span> 
        unknown_user <span style='font-family:Wingdings'>ß</span></p>
      <p style='border:none;padding:0in'> |</p>
      <p style='border:none;padding:0in'> | <span style='font-family:Wingdings'>ą</span> 
        username, password <span style='font-family:Wingdings'>ą</span> <b>Library 
        Server</b></p>
      <p style='border:none;padding:0in'> | <span style='font-family:Wingdings'>ß</span> 
        authorized <span style='font-family:Wingdings'>ß</span></p>
      <p style='border:none;padding:0in'> |</p>
      <p style='border:none;padding:0in'><b>User</b><span
style='font-weight:normal'> </span><span style='font-family:Wingdings'>ą</span> 
        username,password,domain <span style='font-family:Wingdings'>ą</span> 
        <b>Server </b></p>
      <p style='border:none;padding:0in'><b> </b><span
style='font-family:Wingdings'><b>ß</b></span><b> </b><span style='font-weight:
normal'>cookie</span><b> </b><span style='font-family:Wingdings'><b>ß</b></span><b> 
        </b><span style='font-weight:normal'>store session information for valid 
        cookies</span></p>
    </div>
    <p><span style='font-size:14.0pt'><b>Fig. 1.3.1</b></span><span
style='font-size:14.0pt'> – Illustration of Authentication Mechanism</span></p>
    <p class=MsoBodyText style='line-height:normal'><span style='font-size:10.0pt'>At 
      all subsequent interactions, the client sends the cookie back to the server 
      – if the cookie is missing or invalid, the user is re-challenged for login 
      information. Handlers are </span><span style='font-size:10.0pt;font-family:
"Courier New"'>lonacc</span><span style='font-size:10.0pt'> and </span><span
style='font-size:10.0pt;font-family:"Courier New"'>loncacc</span><span
style='font-size:10.0pt'>. Cookies expire by closing the browser and are invalidated 
      when the user logs out or logs in a second time into the same machine from 
      another browser<i>.</i></span></p>
    <h3><a name="_Toc514840850"></a><a name="_Toc421867050">Authentication Mechanisms, 
      User Data, Passwords</a></h3>
    <p>On the library servers, it is a routine in<span
style='font-family:"Courier New"'> lond </span>that does the authentication. It 
      checks if this is the user’s homeserver, checks the password, and answers<span
style='font-family:"Courier New"'> </span>with <span style='font-family:"Courier New"'>“unknown_user”, 
      “authorized” </span>or<span style='font-family:"Courier New"'> “non_authorized”. 
      </span></p>
    <p class=MsoHeader>Determination if this is the user’s homeserver is done 
      by the presence of his or her password file in</p>
    <p><span style='font-family:"Courier New"'> /home/httpd/lonUsers/<i>domain</i></span><span style='font-family:"Courier New"'>/<i>1.char</i></span><span
style='font-family:"Courier New"'>/<i>2.char</i></span><span style='font-family:
"Courier New"'>/<i>3.char</i></span><span style='font-family:"Courier New"'>/<i>username</i></span><span
style='font-family:"Courier New"'>/passwd</span></p>
    <p class=MsoHeader>for example</p>
    <p><span style='font-family:"Courier New"'> /home/httpd/lonUsers/msu/s/m/i/smith/passwd</span></p>
    <p>The password is stored in the format <span style='font-family:
"Courier New"'>mechanism:info, </span>where mechanism can currently be <span
style='font-family:"Courier New"'>unix</span>, <span style='font-family:"Courier New"'>krb4</span> 
      or <span style='font-family:"Courier New"'>internal</span>. For <span
style='font-family:"Courier New"'>krb4</span>, the <span style='font-family:
"Courier New"'>info</span> is the Kerberos domain, for <span style='font-family:
"Courier New"'>internal</span> it is the crypt password itself. <span
style='font-family:"Courier New"'>unix</span> simply authenticates against <span
style='font-family:"Courier New"'>/etc/passwd</span>. </p>
    <h3><a name="_Toc514840851"></a><a name="_Toc421867051">Environment</a></h3>
    <p>The access handlers – coming early in the Apache request cycle – also set 
      up the session environment. The cookie received from the web client is a 
      pointer to the session profiles, which are stored in a directory for temporary 
      files <span style='font-family:"Courier New"'>(/home/httpd/lonIDs/</span>). 
    </p>
    <p class=H5><span style='layout-grid-mode:
both'>Standard Components</span></p>
    <p>These are the standard components of the environment added by Apache and 
      the shell.</p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>AUTH_TYPE ---- 
      Basic</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>DOCUMENT_ROOT ---- 
      /home/httpd/html</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>GATEWAY_INTERFACE 
      ---- CGI-Perl/1.1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_ACCEPT ---- 
      image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_ACCEPT_CHARSET 
      ---- iso-8859-1,*,utf-8</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_ACCEPT_ENCODING 
      ---- gzip</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_ACCEPT_LANGUAGE 
      ---- en,pdf</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_CONNECTION 
      ---- Keep-Alive</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_COOKIE ---- 
      SITESERVER=ID=cbc6695505253a2ff0e7bb7110574d90; lonID=kortemey_990461714_msu_msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_HOST ---- 
      zaphod.lite.msu.edu</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_REFERER ---- 
      </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>HTTP_USER_AGENT 
      ---- Mozilla/4.75 (Macintosh; U; PPC)</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>MOD_PERL ---- mod_perl/1.21</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>PATH ---- /sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bi&curren;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>QUERY_STRING ---- 
      </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>REMOTE_ADDR ---- 
      35.8.63.7</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>REMOTE_PORT ---- 
      1844</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>REMOTE_USER ---- 
      lonadm</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>REQUEST_METHOD 
      ---- GET</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>REQUEST_URI ---- 
      /adm/test</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SCRIPT_FILENAME 
      ---- /home/httpd/html/adm/test</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SCRIPT_NAME ---- 
      /adm/test</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SERVER_ADDR ---- 
      35.8.63.51</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SERVER_ADMIN ---- 
      korte@lite.msu.edu</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SERVER_NAME ---- 
      zaphod.lite.msu.edu</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SERVER_PORT ---- 
      80</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SERVER_PROTOCOL 
      ---- HTTP/1.0</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SERVER_SIGNATURE 
      ---- </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>SERVER_SOFTWARE 
      ---- Apache/1.3.9 (Unix) (Red Hat/Linux) mod_perl/1.21</span></p>
    <p class=H5><span style='layout-grid-mode:
both'>Resource Access Control</span></p>
    <p>The following values are set by traceroute at the initialization of the 
      course and are used by access handlers to check if a resource can be served 
      to a user.</p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.cond.msu_12679c3ed543a25msul1.0 
      ---- 0</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.cond.msu_12679c3ed543a25msul1.1 
      ---- 0</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1. 
      ---- &amp;:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp 
      ---- &amp;welcome267.htm:1&amp;welcomelbs267.htm:0&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/applist/Spectrum 
      ---- &amp;s.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/applist/chain 
      ---- &amp;chain.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/applist/coulomb 
      ---- &amp;orbit.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/applist/induct 
      ---- &amp;faraday.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/conversions 
      ----</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>&amp;conv_area.htm:1&amp;prefixes.htm:1&amp;conv_power.htm:1&amp;intro.htm:1&amp;conv_temperature.htm:1&amp;conv_time.htm:1&amp;conv_velocity.htm:1&amp;conversions.sequence:1&amp;conv_length.htm:1&amp;conv_mass.htm:1&amp;conv_pressure.htm:1&amp;conv_volume.htm:1&amp;conv_energy.htm:1&amp;conv_angle.htm:1&amp;sibaseunits.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap13 
      ---- &amp;cd371.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap16 
      ----</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>&amp;cd427.htm:1&amp;cd424.htm:1&amp;Stable.htm:1&amp;cd421.htm:1&amp;Constants.htm:1&amp;cd425.htm:1&amp;cd422.htm:1&amp;kap16.sequence:1&amp;cd426.htm:1&amp;cd423.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap17 
      ----</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>&amp;cd436.htm:1&amp;kap17.sequence:1&amp;cd433.htm:1&amp;cd430.htm:1&amp;cd437.htm:1&amp;cd434.htm:1&amp;cd428.htm:1&amp;cd431.htm:1&amp;cd435.htm:1&amp;cd429.htm:1&amp;geometry.htm:1&amp;cd432.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap17/calculus 
      ---- &amp;calc.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap18 
      ----</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>&amp;RR440.htm:1&amp;RR449b.htm:1&amp;RR446b.htm:1&amp;cd473.htm:1&amp;RR453.htm:1&amp;RR447.htm:1&amp;RR443b.htm:1&amp;RR449a.htm:1&amp;RR450.htm:1&amp;RR452a.htm:1&amp;RR444.htm:1&amp;RR446a.htm:1&amp;sum18a.htm:1|1&amp;RR441.htm:1&amp;RR443a.htm:1&amp;eField.htm:1&amp;RR454.htm:1&amp;RR444b.htm:1&amp;RR448.htm:1&amp;RR447app.htm:1&amp;RR451.htm:1&amp;RR445.htm:1&amp;RR453a.htm:1&amp;kap18.sequence:1&amp;RR439.htm:1&amp;RR447a.htm:1&amp;RR442.htm:1&amp;RR450a.htm:1&amp;RR444a.htm:1&amp;RR448b.htm:1&amp;RR445newch.htm:1&amp;RR4460app.htm:1&amp;RR455.htm:1&amp;RR441a.htm:1&amp;RR449.htm:1&amp;RR452.htm:1&amp;cd438.htm:1&amp;RR446.htm:1&amp;RR454a.htm:1&amp;sum18.htm:1|1&amp;RR446c.htm:1&amp;RR448a.htm:1&amp;RR451a.htm:1&amp;RR443.htm:1&amp;RR445answer.htm:0&amp;RR445a.htm:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap18/demo 
      ----</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>&amp;vid440.htm:0&amp;vid440sm.htm:0&amp;vid449.htm:0&amp;vid449-a.htm:0&amp;vid441.htm:0&amp;vid449sm.htm:0&amp;vid455.htm:0&amp;egun.htm:0&amp;egunsm.htm:0&amp;vid441sm.htm:0&amp;vid449-asm.htm:0&amp;vid455sm.htm:0&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap18/problems 
      ----</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>&amp;cd460b.problem:1&amp;cd458.problem:1&amp;cd462.problem:1&amp;cd457.problem:1&amp;cd461.problem:1&amp;cd460.problem:1&amp;cd464.problem:1&amp;cd459.problem:1&amp;cd463.problem:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap18a 
      ---- &amp;kap18a.sequence:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap18a/problems 
      ----</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>&amp;cd465.problem:1&amp;cd472.problem:1&amp;cd466.problem:1&amp;cd467.problem:1&amp;cd470.problem:1&amp;cd468.problem:1&amp;cd471.problem:1&amp;cd469.problem:1&amp;</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'><i>… etc for all 
      resources in the course …</i></span></p>
    <p class=H5><span style='layout-grid-mode:
both'>Browser Information</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>browser.mathml 
      ---- </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>browser.os ---- 
      mac</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>browser.type ---- 
      netscape</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>browser.version 
      ---- 4.75</span></p>
    <p class=H5><span style='layout-grid-mode:
both'>Cached Information about Courses and their Description</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a16msul1.description 
      ---- lbs267L Lab SS01</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a16msul1.domain 
      ---- msu</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a16msul1.home 
      ---- msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a16msul1.last_cache 
      ---- 990461725</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a16msul1.num 
      ---- 12679c3ed543a16msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a16msul1.url 
      ---- msu/mmp/lbs267l.sequence</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a25msul1.description 
      ---- lbs267 Lecture SS01</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a25msul1.domain 
      ---- msu</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a25msul1.home 
      ---- msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a25msul1.last_cache 
      ---- 990461728</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a25msul1.num 
      ---- 12679c3ed543a25msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a25msul1.url 
      ---- msu/mmp/lbs267.sequence</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a37msul1.description 
      ---- Demo Course</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a37msul1.domain 
      ---- msu</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a37msul1.home 
      ---- msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a37msul1.last_cache 
      ---- 990461725</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a37msul1.num 
      ---- 12679c3ed543a37msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>course.msu_12679c3ed543a37msul1.url 
      ---- msu/korte/demo.sequence</span></p>
    <p class=H5><span style='layout-grid-mode:
both'>Information Imported from the Environment Database File of the User</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>environment.favorite.cake 
      ---- Cheese Cake</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>environment.favorite.color 
      ---- green</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>environment.firstname 
      ---- Gerd</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>environment.id 
      ---- z12345678</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>environment.lastname 
      ---- Kortemeyer</span></p>
    <p><b>Information about the Request</b></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>httpref./res/msu/mmp/ 
      ---- /res/msu/mmp/welcome267.htm</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.ambiguous 
      ---- adm/pages/index.html</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.course.fn 
      ---- /home/httpd/perl/tmp/kortemey_msu_12679c3ed543a25msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.course.id 
      ---- msu_12679c3ed543a25msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.course.sec 
      ---- </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.course.uri 
      ---- msu/mmp/lbs267.sequence</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.filename 
      ---- /home/httpd/html/adm/test</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.host ---- 
      zaphod.lite.msu.edu</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.role ---- 
      cc./msu/12679c3ed543a25msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>request.state ---- 
      published</span></p>
    <p class=H5><span style='layout-grid-mode:
both'>Information about the User</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.domain ---- 
      msu</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.environment 
      ---- /home/httpd/lonIDs/kortemey_990461714_msu_msul1.id</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.home ---- 
      msul1</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.login.time 
      ---- 990461714</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.name ---- 
      kortemey</span></p>
    <p class=H5><span style='layout-grid-mode:
both'>Information about User Roles and Privileges</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.au./msu/./ 
      ---- :sma&amp;F:gan&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.au./msu/./msu/ 
      ---- :cca&amp;IK:are&amp;F:bre&amp;F:cre&amp;F:ere&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.ca./msu/korte./ 
      ---- :sma&amp;F:gan&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.ca./msu/korte./msu/ 
      ---- :are&amp;F:bre&amp;F:cre&amp;F:ere&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.ca./msu/korte./msu/korte 
      ---- </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a16msul1./ 
      ---- :sma&amp;F:bre&amp;F:mcr&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a16msul1./msu/ 
      ---- </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a16msul1./msu/12679c3ed543a16msul1 
      ---- :opa&amp;F:srm&amp;F:gan&amp;F:are&amp;F:ccr&amp;IK:cep&amp;IK:cta&amp;IK:cre&amp;F:cst&amp;IK:cin&amp;IK:ere&amp;F:vgr&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a25msul1./ 
      ---- :sma&amp;F:bre&amp;F:mcr&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a25msul1./msu/ 
      ---- </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a25msul1./msu/12679c3ed543a25msul1 
      ---- :opa&amp;F:srm&amp;F:gan&amp;F:cta&amp;IK:cep&amp;IK:ccr&amp;IK:are&amp;F:cin&amp;IK:cst&amp;IK:cre&amp;F:ere&amp;F:vgr&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a37msul1./ 
      ---- :sma&amp;F:mcr&amp;F:bre&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a37msul1./msu/ 
      ---- </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a37msul1./msu/12679c3ed543a37msul1 
      ---- :opa&amp;F:srm&amp;F:gan&amp;F:are&amp;F:ccr&amp;IK:cep&amp;IK:cta&amp;IK:cre&amp;F:cst&amp;IK:cin&amp;IK:ere&amp;F:vgr&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./ 
      ---- :sma&amp;F:mcr&amp;F:gan&amp;F:bre&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/ 
      ---- :mau&amp;F:cca&amp;IK:cad&amp;UIK:ccc&amp;U:cst&amp;UIK:cdg&amp;UIK:are&amp;F:cli&amp;UIK:cta&amp;UIK:cep&amp;UIK:ccr&amp;UIK:bre&amp;F:cau&amp;U:cre&amp;F:cin&amp;UIK:ere&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/12679c3ed543a16msul1 
      ---- :opa&amp;F:srm&amp;F:gan&amp;F:are&amp;F:ccr&amp;IK:cep&amp;IK:cta&amp;IK:cre&amp;F:cst&amp;IK:cin&amp;IK:ere&amp;F:vgr&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/12679c3ed543a25msul1 
      ---- :opa&amp;F:srm&amp;F:gan&amp;F:are&amp;F:ccr&amp;IK:cep&amp;IK:cta&amp;IK:cre&amp;F:cst&amp;IK:cin&amp;IK:ere&amp;F:vgr&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/12679c3ed543a37msul1 
      ---- :opa&amp;F:cst&amp;IK:vgr&amp;F:srm&amp;F:gan&amp;F:are&amp;F:ccr&amp;IK:cep&amp;IK:cta&amp;IK:cre&amp;F:cin&amp;IK:ere&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/korte 
      ---- </span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.dc./msu/./ 
      ---- :sma&amp;F</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.dc./msu/./msu/ 
      ---- :mau&amp;F:cad&amp;UIK:ccr&amp;UIK:cep&amp;UIK:cta&amp;UIK:cli&amp;UIK:ccc&amp;U:cau&amp;U:cst&amp;UIK:cin&amp;UIK:cdg&amp;UIK</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.role.au./msu/ 
      ---- 964531839.0</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.role.ca./msu/korte 
      ---- .</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.role.cc./msu/12679c3ed543a16msul1 
      ---- 964531839.0</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.role.cc./msu/12679c3ed543a25msul1 
      ---- 964531839.0</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.role.cc./msu/12679c3ed543a37msul1 
      ---- 964531839.0</span></p>
    <p><span style='font-size:8.0pt;font-family:"Courier New"'>user.role.dc./msu/ 
      ---- 964531839.0</span></p>
    <h2>&nbsp;</h2>
    <h3><a name="_Toc421867052">Handler Reference: LON-CAPA and the 77 Web Perl 
      Modules</a></h3>
    <p><i>Scott Harrison, freeware volunteer, sharrison@sourceforge.net</i><span
style='font-style:normal'> </span></p>
    <p>LON-CAPA provides many different web services for coordinating online educational 
      interactions. Currently, these web services are made available by 77 different 
      perl modules. The invocation of these perl modules is many times due to 
      the URI format based on entries inside <tt><span style='font-family:
"Courier New"'>/etc/httpd/conf/loncapa_apache.conf</span></tt>. </p>
    <p>Throughout this technical manual, various web perl modules are described 
      in detail. Here is a summary of all the 77 web perl modules: </p>
    <table border=1 cellpadding=0>
      <tr> 
        <td class="Normal"> 
          <p align=center style='text-align:center'><b>Name/Location</b></p>
        </td>
        <td class="Normal"> 
          <p align=center style='text-align:center'><b>Description</b></p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonwrapper.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonwrapper.pm</p>
        </td>
        <td class="Normal"> 
          <p>Wrapper for external and binary files as standalone resources. Edit 
            handler for rat maps; TeX content handler.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/publisher/loncfile.pm<br>
            TARGET: home/httpd/lib/perl/Apache/loncfile.pm</p>
        </td>
        <td class="Normal"> 
          <p>Provides web-based functionality for file copy, rename, mkdir, etc, 
            in the construction space menu.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonstatistics.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonstatistics.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to show statistics on solving LON-CAPA problems.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/publisher/londiff.pm<br>
            TARGET: home/httpd/lib/perl/Apache/londiff.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to show difference between two files.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/publisher/lonupload.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonupload.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to upload files through browser into construction space.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/essayresponse.pm<br>
            TARGET: home/httpd/lib/perl/Apache/essayresponse.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to evaluate essay (ungraded) style responses.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/externalresponse.pm<br>
            TARGET: home/httpd/lib/perl/Apache/externalresponse.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to evaluate externally graded responses.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/loncapagrade.pm<br>
            TARGET: home/httpd/lib/perl/Apache/loncapagrade.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to evaluate externally graded responses.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/publisher/lonpubdir.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonpubdir.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to publish directories.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/publisher/lonretrieve.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonretrieve.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to retrieve old versions from resource space.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/edit.pm<br>
            TARGET: home/httpd/lib/perl/Apache/edit.pm</p>
        </td>
        <td class="Normal"> 
          <p>Helper functions when in homework edit mode.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonmeta.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonmeta.pm</p>
        </td>
        <td class="Normal"> 
          <p>Metadata display handler.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonambiguous.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonambiguous.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to resolve ambiguous file locations.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonratparms.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonratparms.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to set resource parameters inside of the RAT based on metadata.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonsequence.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonsequence.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler for showing sequence objects of educational resources.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/loncreatecourse.pm<br>
            TARGET: home/httpd/lib/perl/Apache/loncreatecourse.pm</p>
        </td>
        <td class="Normal"> 
          <p>Allows domain coordinators to create new courses and assign course 
            coordinators.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/loncreateuser.pm<br>
            TARGET: home/httpd/lib/perl/Apache/loncreateuser.pm</p>
        </td>
        <td class="Normal"> 
          <p>Allows users to within their own privileges create/edit users and 
            give them roles.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonchart.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonchart.pm</p>
        </td>
        <td class="Normal"> 
          <p>Produces simple LectureOnline-like student assessment performance 
            chart</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/loncommon.pm<br>
            TARGET: home/httpd/lib/perl/Apache/loncommon.pm</p>
        </td>
        <td class="Normal"> 
          <p>Makes a table out of the previous attempts. Inputs result_from_symbread, 
            user, domain, home_server, course_id.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/grades.pm<br>
            TARGET: home/httpd/lib/perl/Apache/grades.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles the viewing of grades.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/imageresponse.pm<br>
            TARGET: home/httpd/lib/perl/Apache/imageresponse.pm</p>
        </td>
        <td class="Normal"> 
          <p>Coordinates the response to clicking an image.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/optionresponse.pm<br>
            TARGET: home/httpd/lib/perl/Apache/optionresponse.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles tags associated with showing a list of options.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/outputtags.pm<br>
            TARGET: home/httpd/lib/perl/Apache/outputtags.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles tags associated with output. Seems to relate to due dates 
            of the assignment.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lontest.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lontest.pm</p>
        </td>
        <td class="Normal"> 
          <p>Used for debugging and testing the LON-CAPA system.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/radiobuttonresponse.pm<br>
            TARGET: home/httpd/lib/perl/Apache/radiobuttonresponse.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles multiple-choice style responses.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonassignments.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonassignments.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles processing of assignments.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/loncommunicate.pm<br>
            TARGET: home/httpd/lib/perl/Apache/loncommunicate.pm</p>
        </td>
        <td class="Normal"> 
          <p>Will be the access handler to email sending, as well as the planned 
            chatrooms, etc.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonerrorhandler.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonerrorhandler.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles errors.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonevaluate.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonevaluate.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles evaluation.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonfeedback.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonfeedback.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles feedback from students to instructors and system administrators. 
            Provides a screenshot of the current resource, as well as previous 
            attempts if the resource was a homework. Used by lonmsg.pm.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonnavmaps.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonnavmaps.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles navigational maps.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonpreferences.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonpreferences.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles user preferences associated with customizing the online LON-CAPA 
            educational environment.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonprintout.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonprintout.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles the production of printable files and resources.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonsearchcat.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonsearchcat.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handles a searchable catalogue.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/londropadd.pm<br>
            TARGET: home/httpd/lib/perl/Apache/londropadd.pm</p>
        </td>
        <td class="Normal"> 
          <p>Allows course coordinators to upload courselists in different formats, 
            and automatically create users (if they do not exist already), assign 
            them the role of student in a course, and add them to the classlist.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonmsg.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonmsg.pm</p>
        </td>
        <td class="Normal"> 
          <p>lonmsg.pm has several functions to send and receive internal messages. 
            author_res_msg - send message to resource author. user_crit_msg - 
            send a critical message to a user. A critical message will require 
            acknowledgment by the recipient and the sender will be notified. user_crit_received 
            - routine to trigger acknowledgment. statuschange - change the status 
            of a message (read, replied, forwarded, etc). The handler also displays 
            messages, has routines to reply, etc.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/hint.pm<br>
            TARGET: home/httpd/lib/perl/Apache/hint.pm</p>
        </td>
        <td class="Normal"> 
          <p>This handler coordinates the delivery of hints to students working 
            on LON-CAPA problems and assignments.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonspreadsheet.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonspreadsheet.pm</p>
        </td>
        <td class="Normal"> 
          <p>Spreadsheets are completely web-based. They exist on the level of 
            a whole course, a student, and individual assessments.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonparmset.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonparmset.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler to resolve ambiguous file locations</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/publisher/lonconstruct.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonconstruct.pm</p>
        </td>
        <td class="Normal"> 
          <p>Page wrapper for handling construction space.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/publisher/lonpublisher.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonpublisher.pm</p>
        </td>
        <td class="Normal"> 
          <p>Publishes an LON-CAPA educational resource complete with metadata 
            (authorship, language, copyright, creation date, etc).</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonmenu.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonmenu.pm</p>
        </td>
        <td class="Normal"> 
          <p>Has routines which control the remote control.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonpageflip.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonpageflip.pm</p>
        </td>
        <td class="Normal"> 
          <p>Deals with forward, backward, and other page flips.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonratedt.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonratedt.pm</p>
        </td>
        <td class="Normal"> 
          <p>Builds up frame set and loads in the right thing.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/html/res/adm/pages/homeworkmenu.html<br>
            TARGET: home/httpd/html/res/adm/pages/homeworkmenu.html</p>
        </td>
        <td class="Normal"> 
          <p>Homework remote control.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/html/res/adm/pages/annotator/admannotations.pm<br>
            TARGET: home/httpd/lib/perl/Apache/admannotations.pm</p>
        </td>
        <td class="Normal"> 
          <p>This will take annotations and then plug them into a page.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/html/res/adm/pages/bookmarkmenu/admbookmarks.pm<br>
            TARGET: home/httpd/lib/perl/Apache/admbookmarks.pm</p>
        </td>
        <td class="Normal"> 
          <p>This will take bookmarks and get/write/display them for the LON-CAPA 
            user interface.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonratsrv.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonratsrv.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler that takes output from RAT and stores it on disk. Handles 
            the upper hidden frame of the added window that comes up in RAT. (3 
            frames come up in RAT server, code, and output. This module handles 
            server connection.)</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonpage.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonpage.pm</p>
        </td>
        <td class="Normal"> 
          <p>bundles pages into one page</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: rat/lonuserstate.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonuserstate.pm</p>
        </td>
        <td class="Normal"> 
          <p>compile course into binary data structure (in loncom/rat)</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/lontex.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lontex.pm</p>
        </td>
        <td class="Normal"> 
          <p>Handler for tex files (somewhere in modules)</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/lontexconvert.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lontexconvert.pm</p>
        </td>
        <td class="Normal"> 
          <p>Access to tth/ttm</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/lonxml.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonxml.pm</p>
        </td>
        <td class="Normal"> 
          <p>XML Parsing Module</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/lonplot.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonplot.pm</p>
        </td>
        <td class="Normal"> 
          <p>XML-based plotter of graphs</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/style.pm<br>
            TARGET: home/httpd/lib/perl/Apache/style.pm</p>
        </td>
        <td class="Normal"> 
          <p>Style Parsing Module</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/londefdef.pm<br>
            TARGET: home/httpd/lib/perl/Apache/londefdef.pm</p>
        </td>
        <td class="Normal"> 
          <p>Tags Default Definition Module</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/run.pm<br>
            TARGET: home/httpd/lib/perl/Apache/run.pm</p>
        </td>
        <td class="Normal"> 
          <p>used to prevent poorly written problems from causing lingering after 
            effects</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/scripttag.pm<br>
            TARGET: home/httpd/lib/perl/Apache/scripttag.pm</p>
        </td>
        <td class="Normal"> 
          <p>implements &lt;script&gt;, &lt;scriptlib&gt;, &lt;parserlib&gt;, 
            and &lt;import&gt;</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/randomlabel.pm<br>
            TARGET: home/httpd/lib/perl/Apache/randomlabel.pm</p>
        </td>
        <td class="Normal"> 
          <p>Interface for producing applet code which randomizes the labelling 
            of an image.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/lonhomework.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonhomework.pm</p>
        </td>
        <td class="Normal"> 
          <p>handles requests for output, evaluation, and alteration of a homework 
            resource</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/inputtags.pm<br>
            TARGET: home/httpd/lib/perl/Apache/inputtags.pm</p>
        </td>
        <td class="Normal"> 
          <p>produces HTML input tags (&lt;INPUT&gt;) for rendering homework resources</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/structuretags.pm<br>
            TARGET: home/httpd/lib/perl/Apache/structuretags.pm</p>
        </td>
        <td class="Normal"> 
          <p>produces HTML tags necessary for structuring the presentation of 
            homework resources</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/response.pm<br>
            TARGET: home/httpd/lib/perl/Apache/response.pm</p>
        </td>
        <td class="Normal"> 
          <p>defines different types of responses given to student as well as 
            syntax for producing response values</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/caparesponse/caparesponse.pm<br>
            TARGET: home/httpd/lib/perl/Apache/caparesponse.pm</p>
        </td>
        <td class="Normal"> 
          <p>handles request to the CAPA homework processing engine</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/xml/Safe.pm<br>
            TARGET: home/httpd/lib/perl/Safe.pm</p>
        </td>
        <td class="Normal"> 
          <p>Meant to safely substitute for CPAN version of Safe. Allows for safely 
            executing embedded perl comands in a way that does not threaten the 
            operating system.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/auth/localauth.pm<br>
            TARGET: home/httpd/lib/perl/localauth.pm</p>
        </td>
        <td class="Normal"> 
          <p>Local authentication mechanism (meant to be customized).</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/auth/lonacc.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonacc.pm</p>
        </td>
        <td class="Normal"> 
          <p>(This module, like loncacc.pm also authenticates with cookies.) lonacc.pm 
            coordinates access to a wide range of administrative-type functions 
            (e.g. roles, logout, annotations, and bookmarks) as well as coordinating 
            access to educational resources.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/auth/lonracc.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonracc.pm</p>
        </td>
        <td class="Normal"> 
          <p>access handler for file transfers</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/auth/loncacc.pm<br>
            TARGET: home/httpd/lib/perl/Apache/loncacc.pm</p>
        </td>
        <td class="Normal"> 
          <p>This module provides access to an educational resource construction 
            area. This module is invoked by the URL-related pattern syntax LocationMatch 
            &quot;^/priv.*&quot; or LocationMatch &quot;^/\~.*&quot;. Authentication 
            of user identity is coordinated through cookies. The abbreviation 
            &quot;cacc&quot; corresponds to &quot;construction-space access&quot;). 
            If the cookie handle is invalid, then this module returns a forbidden 
            status and makes appropriate log entries. If the cookie handle is 
            valid, status is determined to be okay (and, for the &quot;priv&quot;-type 
            access, the resource is delivered by the lonconstruct module).</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/auth/lonauth.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonauth.pm</p>
        </td>
        <td class="Normal"> 
          <p>authenticate, set up session environment</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/auth/lonlogin.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonlogin.pm</p>
        </td>
        <td class="Normal"> 
          <p>login screen</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/auth/lonlogout.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonlogout.pm</p>
        </td>
        <td class="Normal"> 
          <p>logout</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/lonnet/perl/lonrep.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonrep.pm</p>
        </td>
        <td class="Normal"> 
          <p>replication</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/auth/lonroles.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonroles.pm</p>
        </td>
        <td class="Normal"> 
          <p>This perl handling module reads in the available roles available 
            for a LON-CAPA user (different courses, different privileges, etc) 
            and produces a form-element HTML page which allows the user to select 
            which role he wishes to exercise in the LON-CAPA system. For instance, 
            a user may want to select between being a student in a thermodynamics 
            physics course or a teaching assistant for an introductory calculus 
            class.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/lonindexer.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonindexer.pm</p>
        </td>
        <td class="Normal"> 
          <p>cross server filesystem browser</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/interface/groupsort.pm<br>
            TARGET: home/httpd/lib/perl/Apache/groupsort.pm</p>
        </td>
        <td class="Normal"> 
          <p>Implements a second phase of importing multiple resources into the 
            RAT. Allows for reordering the sequence of resources.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/lonnet/perl/lonnet.pm<br>
            TARGET: home/httpd/lib/perl/Apache/lonnet.pm</p>
        </td>
        <td class="Normal"> 
          <p>This file is an interface to the lonc processes of the LON-CAPA network 
            as well as set of elaborated functions for handling information necessary 
            for navigating through a given cluster of LON-CAPA machines within 
            a domain. There are over 40 specialized functions in this module which 
            handle the reading and transmission of metadata, user information 
            (ids, names, environments, roles, logs), file information (storage, 
            reading, directories, extensions, replication, embedded styles and 
            descriptors), educational resources (course descriptions, section 
            names and numbers), url hashing (to assign roles on a url basis), 
            and translating abbreviated symbols to and from more descriptive phrases 
            or explanations.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/lectureonline.lcpm<br>
            TARGET: home/httpd/html/res/adm/includes/lectureonline.lcpm</p>
        </td>
        <td class="Normal"> 
          <p>Intended for providing perl functions for the &lt;script&gt;&lt;/script&gt; 
            environment in a problem that was converted from lectureonline.</p>
        </td>
      </tr>
      <tr> 
        <td class="Normal"> 
          <p>SOURCE: loncom/homework/default_homework.lcpm<br>
            TARGET: home/httpd/html/res/adm/includes/default_homework.lcpm</p>
        </td>
        <td class="Normal"> 
          <p>Provides many functions for the &lt;script&gt; environment in a .problem. 
            Functions are documented in CVS:loncapa/doc/homework/homework5.html.</p>
        </td>
      </tr>
    </table>
  </div>
</div>
</body>
</html>

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>