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<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. 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 Ð 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 (ÒstageÓ) 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 Ð they
run inside of Apache. The mod_perl mechanism in addition links the Perl interpreter
into the Apache child process. Modules are pre-interpreted (ÒcompiledÓ) 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). </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"'><LocationMatch "^/res.*"></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler
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
403 /adm/login</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
404 /adm/notfound.html</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
406 /adm/roles</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
500 /adm/errorhandler</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'></LocationMatch></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><LocationMatch "^/priv.*"></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
perl-script</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler
Apache::lonconstruct</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
403 /adm/login</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
404 /adm/notfound.html</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
406 /adm/unauthorized.html</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
500 /adm/errorhandler</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'></LocationMatch></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><LocationMatch "^/raw.*"></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"'></LocationMatch></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><LocationMatch "^/\~.*"></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
403 /adm/login</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
404 /adm/notfound.html</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
406 /adm/unauthorized.html</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
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"'></LocationMatch></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:20.0pt;font-family:"Courier New"'><b>É</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"'><LocationMatch "^/res/.*/$"></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lonindexer</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'></LocationMatch></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><LocationMatch "^/res/.*\.tex$"></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"'></LocationMatch></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><LocationMatch "^/res/.*\.page$></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>SetHandler perl-script</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlHandler Apache::lonpage</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'></LocationMatch></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:20.0pt;font-family:"Courier New"'><b>É</b></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><LocationMatch "^/(res|\~).*\.(xml|html|htm|xhtml|xhtm)$"></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"'></LocationMatch></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><LocationMatch "^/(res|\~).*\.(problem|exam|quiz|assess|survey|form)$"></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"'></LocationMatch></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"'><Location /adm/roles></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler
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
403 /adm/login</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
500 /adm/errorhandler</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'></Location></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><Location /adm/login></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"'></Location></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:20.0pt;font-family:"Courier New"'><b>É</b></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'><Location /adm/annotations></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>PerlAccessHandler
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
403 /adm/login</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'>ErrorDocument
500 /adm/errorhandler</span></p>
<p style='border:none;padding:0in;'><span
style='font-size:8.0pt;font-family:"Courier New"'></Location></span></p>
<p style='border:none;padding:0in;'><span
style='font-size:14.0pt;font-family:"Courier New"'><b>É etc É</b></span></p>
</div>
<p><span style='font-size:14.0pt'><b>Fig. 1.2.2</b></span><span
style='font-size:14.0pt'> Ð 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 userÕs 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 Ð 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 Ð this is done
by <span style='font-family:"Courier New"'>lonauth</span>. </p>
<p>The userÕs 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. <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'>ˆ</span>
username, password <span style='font-family:Wingdings'>ˆ</span> <b>Library
Server</b></p>
<p style='border:none;padding:0in'> | <span style='font-family:Wingdings'>§</span>
unknown_user <span style='font-family:Wingdings'>§</span></p>
<p style='border:none;padding:0in'> |</p>
<p style='border:none;padding:0in'> | <span style='font-family:Wingdings'>ˆ</span>
username, password <span style='font-family:Wingdings'>ˆ</span> <b>Library
Server</b></p>
<p style='border:none;padding:0in'> | <span style='font-family:Wingdings'>§</span>
authorized <span style='font-family:Wingdings'>§</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'>ˆ</span>
username,password,domain <span style='font-family:Wingdings'>ˆ</span>
<b>Server </b></p>
<p style='border:none;padding:0in'><b> </b><span
style='font-family:Wingdings'><b>§</b></span><b> </b><span style='font-weight:
normal'>cookie</span><b> </b><span style='font-family:Wingdings'><b>§</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'> Ð 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
Ð 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 userÕs homeserver, checks the password, and answers<span
style='font-family:"Courier New"'> </span>with <span style='font-family:"Courier New"'>Òunknown_userÓ,
ÒauthorizedÓ </span>or<span style='font-family:"Courier New"'> Ònon_authorizedÓ.
</span></p>
<p class=MsoHeader>Determination if this is the userÕs 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 Ð coming early in the Apache request cycle Ð 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¤</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.
---- &:1&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp
---- &welcome267.htm:1&welcomelbs267.htm:0&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/applist/Spectrum
---- &s.htm:1&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/applist/chain
---- &chain.htm:1&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/applist/coulomb
---- &orbit.htm:1&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/applist/induct
---- &faraday.htm:1&</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"'>&conv_area.htm:1&prefixes.htm:1&conv_power.htm:1&intro.htm:1&conv_temperature.htm:1&conv_time.htm:1&conv_velocity.htm:1&conversions.sequence:1&conv_length.htm:1&conv_mass.htm:1&conv_pressure.htm:1&conv_volume.htm:1&conv_energy.htm:1&conv_angle.htm:1&sibaseunits.htm:1&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap13
---- &cd371.htm:1&</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"'>&cd427.htm:1&cd424.htm:1&Stable.htm:1&cd421.htm:1&Constants.htm:1&cd425.htm:1&cd422.htm:1&kap16.sequence:1&cd426.htm:1&cd423.htm:1&</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"'>&cd436.htm:1&kap17.sequence:1&cd433.htm:1&cd430.htm:1&cd437.htm:1&cd434.htm:1&cd428.htm:1&cd431.htm:1&cd435.htm:1&cd429.htm:1&geometry.htm:1&cd432.htm:1&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap17/calculus
---- &calc.htm:1&</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"'>&RR440.htm:1&RR449b.htm:1&RR446b.htm:1&cd473.htm:1&RR453.htm:1&RR447.htm:1&RR443b.htm:1&RR449a.htm:1&RR450.htm:1&RR452a.htm:1&RR444.htm:1&RR446a.htm:1&sum18a.htm:1|1&RR441.htm:1&RR443a.htm:1&eField.htm:1&RR454.htm:1&RR444b.htm:1&RR448.htm:1&RR447app.htm:1&RR451.htm:1&RR445.htm:1&RR453a.htm:1&kap18.sequence:1&RR439.htm:1&RR447a.htm:1&RR442.htm:1&RR450a.htm:1&RR444a.htm:1&RR448b.htm:1&RR445newch.htm:1&RR4460app.htm:1&RR455.htm:1&RR441a.htm:1&RR449.htm:1&RR452.htm:1&cd438.htm:1&RR446.htm:1&RR454a.htm:1&sum18.htm:1|1&RR446c.htm:1&RR448a.htm:1&RR451a.htm:1&RR443.htm:1&RR445answer.htm:0&RR445a.htm:1&</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"'>&vid440.htm:0&vid440sm.htm:0&vid449.htm:0&vid449-a.htm:0&vid441.htm:0&vid449sm.htm:0&vid455.htm:0&egun.htm:0&egunsm.htm:0&vid441sm.htm:0&vid449-asm.htm:0&vid455sm.htm:0&</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"'>&cd460b.problem:1&cd458.problem:1&cd462.problem:1&cd457.problem:1&cd461.problem:1&cd460.problem:1&cd464.problem:1&cd459.problem:1&cd463.problem:1&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>acc.res.msu_12679c3ed543a25msul1.msu/mmp/kap18a
---- &kap18a.sequence:1&</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"'>&cd465.problem:1&cd472.problem:1&cd466.problem:1&cd467.problem:1&cd470.problem:1&cd468.problem:1&cd471.problem:1&cd469.problem:1&</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'><i>É etc for all
resources in the course É</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&F:gan&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.au./msu/./msu/
---- :cca&IK:are&F:bre&F:cre&F:ere&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.ca./msu/korte./
---- :sma&F:gan&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.ca./msu/korte./msu/
---- :are&F:bre&F:cre&F:ere&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&F:bre&F:mcr&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&F:srm&F:gan&F:are&F:ccr&IK:cep&IK:cta&IK:cre&F:cst&IK:cin&IK:ere&F:vgr&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a25msul1./
---- :sma&F:bre&F:mcr&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&F:srm&F:gan&F:cta&IK:cep&IK:ccr&IK:are&F:cin&IK:cst&IK:cre&F:ere&F:vgr&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cc./msu/12679c3ed543a37msul1./
---- :sma&F:mcr&F:bre&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&F:srm&F:gan&F:are&F:ccr&IK:cep&IK:cta&IK:cre&F:cst&IK:cin&IK:ere&F:vgr&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./
---- :sma&F:mcr&F:gan&F:bre&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/
---- :mau&F:cca&IK:cad&UIK:ccc&U:cst&UIK:cdg&UIK:are&F:cli&UIK:cta&UIK:cep&UIK:ccr&UIK:bre&F:cau&U:cre&F:cin&UIK:ere&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/12679c3ed543a16msul1
---- :opa&F:srm&F:gan&F:are&F:ccr&IK:cep&IK:cta&IK:cre&F:cst&IK:cin&IK:ere&F:vgr&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/12679c3ed543a25msul1
---- :opa&F:srm&F:gan&F:are&F:ccr&IK:cep&IK:cta&IK:cre&F:cst&IK:cin&IK:ere&F:vgr&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.cm./msu/12679c3ed543a37msul1
---- :opa&F:cst&IK:vgr&F:srm&F:gan&F:are&F:ccr&IK:cep&IK:cta&IK:cre&F:cin&IK:ere&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&F</span></p>
<p><span style='font-size:8.0pt;font-family:"Courier New"'>user.priv.dc./msu/./msu/
---- :mau&F:cad&UIK:ccr&UIK:cep&UIK:cta&UIK:cli&UIK:ccc&U:cau&U:cst&UIK:cin&UIK:cdg&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> </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 <script>, <scriptlib>, <parserlib>,
and <import></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 (<INPUT>) 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
"^/priv.*" or LocationMatch "^/\~.*". Authentication
of user identity is coordinated through cookies. The abbreviation
"cacc" corresponds to "construction-space access").
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 "priv"-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 <script></script>
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 <script> environment in a .problem.
Functions are documented in CVS:loncapa/doc/homework/homework5.html.</p>
</td>
</tr>
</table>
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