1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # (TeX Content Handler
5: #
6: # 05/29/00,05/30 Gerd Kortemeyer)
7: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
8: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31 Gerd Kortemeyer
9:
10: package Apache::lonpage;
11:
12: use strict;
13: use Apache::Constants qw(:common :http);
14: use Apache::lonnet();
15: use HTML::TokeParser;
16: use GDBM_File;
17:
18: # -------------------------------------------------------------- Module Globals
19: my %hash;
20: my @rows;
21:
22: # ------------------------------------------------------------------ Euclid gcd
23:
24: sub euclid {
25: my ($e,$f)=@_;
26: my $a; my $b; my $r;
27: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
28: while ($r!=0) {
29: $a=$b; $b=$r;
30: $r=$a%$b;
31: }
32: return $b;
33: }
34:
35: # ------------------------------------------------------------ Build page table
36:
37: sub tracetable {
38: my ($sofar,$rid,$beenhere)=@_;
39: my $further=$sofar;
40: unless ($beenhere=~/\&$rid\&/) {
41: $beenhere.=$rid.'&';
42:
43: if (defined($hash{'is_map_'.$rid})) {
44: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
45: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
46: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
47: $sofar=
48: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
49: '&'.$frid.'&');
50: $sofar++;
51: if ($hash{'src_'.$frid}) {
52: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
53: if (($brepriv eq '2') || ($brepriv eq 'F')) {
54: if (defined($rows[$sofar])) {
55: $rows[$sofar].='&'.$frid;
56: } else {
57: $rows[$sofar]=$frid;
58: }
59: }
60: }
61: }
62: } else {
63: $sofar++;
64: if ($hash{'src_'.$rid}) {
65: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
66: if (($brepriv eq '2') || ($brepriv eq 'F')) {
67: if (defined($rows[$sofar])) {
68: $rows[$sofar].='&'.$rid;
69: } else {
70: $rows[$sofar]=$rid;
71: }
72: }
73: }
74: }
75:
76: if (defined($hash{'to_'.$rid})) {
77: my $mincond=1;
78: my $next='';
79: map {
80: my $thiscond=
81: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
82: if ($thiscond>=$mincond) {
83: if ($next) {
84: $next.=','.$_.':'.$thiscond;
85: } else {
86: $next=$_.':'.$thiscond;
87: }
88: if ($thiscond>$mincond) { $mincond=$thiscond; }
89: }
90: } split(/\,/,$hash{'to_'.$rid});
91: map {
92: my ($linkid,$condval)=split(/\:/,$_);
93: if ($condval>=$mincond) {
94: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
95: if ($now>$further) { $further=$now; }
96: }
97: } split(/\,/,$next);
98:
99: }
100: }
101: return $further;
102: }
103:
104: # ================================================================ Main Handler
105:
106: sub handler {
107: my $r=shift;
108:
109: # ------------------------------------------- Set document type for header only
110:
111: if ($r->header_only) {
112: if ($ENV{'browser.mathml'}) {
113: $r->content_type('text/xml');
114: } else {
115: $r->content_type('text/html');
116: }
117: $r->send_http_header;
118: return OK;
119: }
120:
121: my $requrl=$r->uri;
122: # ----------------------------------------------------------------- Tie db file
123: if ($ENV{'request.course.fn'}) {
124: my $fn=$ENV{'request.course.fn'};
125: if (-e "$fn.db") {
126: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
127: # ------------------------------------------------------------------- Hash tied
128: my $firstres=$hash{'map_start_'.$requrl};
129: my $lastres=$hash{'map_finish_'.$requrl};
130: if (($firstres) && ($lastres)) {
131: # ----------------------------------------------------------------- Render page
132:
133: @rows=();
134:
135: &tracetable(0,$firstres,'&'.$lastres.'&');
136: if ($hash{'src_'.$lastres}) {
137: my $brepriv=
138: &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
139: if (($brepriv eq '2') || ($brepriv eq 'F')) {
140: $rows[$#rows+1]=''.$lastres;
141: }
142: }
143:
144: # ------------------------------------------------------------ Add to symb list
145:
146: my $i;
147: my %symbhash=();
148: for ($i=0;$i<=$#rows;$i++) {
149: if ($rows[$i]) {
150: my @colcont=split(/\&/,$rows[$i]);
151: map {
152: $symbhash{$hash{'src_'.$_}}='';
153: } @colcont;
154: }
155: }
156: &Apache::lonnet::symblist($requrl,%symbhash);
157:
158: # ------------------------------------------------------------------ Page parms
159:
160: my $j;
161: my $lcm=1;
162: my $contents=0;
163: my $nforms=0;
164:
165: my %ssibody=();
166: my %ssibgcolor=();
167: my %ssitext=();
168: my %ssilink=();
169: my %ssivlink=();
170: my %ssialink=();
171:
172: my %metalink=();
173:
174: my %cellemb=();
175:
176: my $allscript='';
177: my $allmeta='';
178:
179: my $isxml=0;
180: my $xmlheader='';
181: my $xmlbody='';
182:
183: my %httpref=();
184:
185: # --------------------------------------------- Get SSI output, post parameters
186:
187: for ($i=0;$i<=$#rows;$i++) {
188: if ($rows[$i]) {
189: $contents++;
190: my @colcont=split(/\&/,$rows[$i]);
191: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
192: map {
193: my $src=$hash{'src_'.$_};
194: $src=~/\.(\w+)$/;
195: $metalink{$_}=$src.'.meta';
196: $cellemb{$_}=Apache::lonnet::fileembstyle($1);
197: if ($cellemb{$_} eq 'ssi') {
198: # --------------------------------------------------------- This is an SSI cell
199: my $prefix=$_.'_';
200: my %posthash=('request.prefix' => $prefix);
201: if (($ENV{'form.'.$prefix.'submit'})
202: || ($ENV{'form.all_submit'})) {
203: map {
204: if ($_=~/^form.$prefix/) {
205: my $name=$_;
206: $name=~s/^form.$prefix//;
207: $posthash{$name}=$ENV{$_};
208: }
209: } keys %ENV;
210: }
211: my $output=Apache::lonnet::ssi($src,%posthash);
212: my $parser=HTML::TokeParser->new(\$output);
213: my $token;
214: my $thisdir=$src;
215: my $bodydef=0;
216: my $thisxml=0;
217: my @rlinks=();
218: my @alinks=();
219: if ($output=~/\?xml/) {
220: $isxml=1;
221: $thisxml=1;
222: $output=~
223: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
224: $xmlheader=$1;
225: }
226: while ($token=$parser->get_token) {
227: if ($token->[0] eq 'S') {
228: if ($token->[1] eq 'a') {
229: if ($token->[2]->{'href'}) {
230: $rlinks[$#rlinks+1]=
231: $token->[2]->{'href'};
232: }
233: } elsif ($token->[1] eq 'img') {
234: $rlinks[$#rlinks+1]=
235: $token->[2]->{'src'};
236: $alinks[$#alinks+1]=
237: $token->[2]->{'src'};
238: } elsif ($token->[1] eq 'embed') {
239: $rlinks[$#rlinks+1]=
240: $token->[2]->{'src'};
241: $alinks[$#alinks+1]=
242: $token->[2]->{'src'};
243: } elsif ($token->[1] eq 'applet') {
244: $alinks[$#alinks+1]=
245: $token->[2]->{'code'};
246: $alinks[$#alinks+1]=
247: $token->[2]->{'archive'};
248: } elsif ($token->[1] eq 'param') {
249: if ($token->[2]->{'name'} eq 'cabbase') {
250: $alinks[$#alinks+1]=
251: $token->[2]->{'value'};
252: }
253: } elsif ($token->[1] eq 'base') {
254: $thisdir=$token->[2]->{'href'};
255: } elsif ($token->[1] eq 'body') {
256: $bodydef=1;
257: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
258: $ssitext{$_}=$token->[2]->{'text'};
259: $ssilink{$_}=$token->[2]->{'link'};
260: $ssivlink{$_}=$token->[2]->{'vlink'};
261: $ssialink{$_}=$token->[2]->{'alink'};
262: if ($thisxml) {
263: $xmlbody=$token->[4];
264: }
265: } elsif ($token->[1] eq 'meta') {
266: $allmeta.="\n".$token->[4].'</meta>';
267: } elsif (($token->[1] eq 'script') &&
268: ($bodydef==0)) {
269: $allscript.="\n\n"
270: .$parser->get_text('/script');
271: }
272: }
273: }
274: if ($output=~/\<body[^\>]*\>(.*)/si) {
275: $output=$1;
276: }
277: $output=~s/\<\/body\>.*//si;
278: if ($output=~/\<form/si) {
279: $nforms++;
280: $output=~s/\<form[^\>]*\>//gsi;
281: $output=~s/\<\/form[^\>]*\>//gsi;
282: }
283: $thisdir=~s/\/[^\/]*$//;
284: map {
285: unless (($_=~/^http:\/\//i) ||
286: ($_=~/^\//)) {
287: my $newlocation=
288: &Apache::lonnet::hreflocation($thisdir,$_);
289: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
290: }
291: } @rlinks;
292: map {
293: $httpref{'httpref.'.
294: &Apache::lonnet::hreflocation($thisdir,$_)}=
295: $r->uri;
296: } @alinks;
297: $output=~s/\<\s*applet/\<applet codebase=\"$thisdir\" /gi;
298: $ssibody{$_}=$output;
299: # ---------------------------------------------------------------- End SSI cell
300: }
301: } @colcont;
302: }
303: }
304: unless ($contents) {
305: $r->content_type('text/html');
306: $r->send_http_header;
307: $r->print('<html><body>Empty page.</body></html>');
308: } else {
309: # ------------------------------------------------------------------ Build page
310:
311: # ------------------------------------------------------------- Mark references
312: &Apache::lonnet::appenv(%httpref);
313: # ---------------------------------------------------------------- Send headers
314: if ($isxml) {
315: $r->content_type('text/xml');
316: $r->send_http_header;
317: $r->print($xmlheader);
318: } else {
319: $r->content_type('text/html');
320: $r->send_http_header;
321: $r->print('<html>');
322: }
323: # ------------------------------------------------------------------------ Head
324: $r->print("\n<head>\n".$allmeta);
325: if ($allscript) {
326: $r->print("\n<script>\n".$allscript."\n</script>\n");
327: }
328: $r->print("\n</head>\n");
329: # ------------------------------------------------------------------ Start body
330: if ($isxml) {
331: $r->print($xmlbody);
332: } else {
333: $r->print('<body bgcolor="#FFFFFF">');
334: }
335: # ------------------------------------------------------------------ Start form
336: if ($nforms) {
337: $r->print('<form method="post" action="'.
338: $requrl.'">');
339: }
340: # ----------------------------------------------------------------- Start table
341: $r->print('<table cols="'.$lcm.'" border="0">');
342: for ($i=0;$i<=$#rows;$i++) {
343: if ($rows[$i]) {
344: $r->print("\n<tr>");
345: my @colcont=split(/\&/,$rows[$i]);
346: my $avespan=$lcm/($#colcont+1);
347: for ($j=0;$j<=$#colcont;$j++) {
348: my $rid=$colcont[$j];
349: my $metainfo='<a href="'.
350: $metalink{$rid}.'" target="LONcatInfo">'.
351: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
352: '</img></a><br></br>';
353: $r->print('<td colspan="'.$avespan.'"');
354: if ($cellemb{$rid} eq 'ssi') {
355: if ($ssibgcolor{$rid}) {
356: $r->print(' bgcolor="'.
357: $ssibgcolor{$rid}.'"');
358: }
359: $r->print('>'.$metainfo.'<font');
360: if ($ssitext{$rid}) {
361: $r->print(' text="'.$ssitext{$rid}.'"');
362: }
363: if ($ssilink{$rid}) {
364: $r->print(' link="'.$ssilink{$rid}.'"');
365: }
366: if ($ssitext{$rid}) {
367: $r->print(' vlink="'.$ssivlink{$rid}.'"');
368: }
369: if ($ssialink{$rid}) {
370: $r->print(' alink="'.$ssialink{$rid}.'"');
371: }
372:
373: $r->print('>'.$ssibody{$rid}.'</font>');
374: } elsif ($cellemb{$rid} eq 'img') {
375: $r->print('>'.$metainfo.'<img src="'.
376: $hash{'src_'.$rid}.'"></img>');
377: } elsif ($cellemb{$rid} eq 'emb') {
378: $r->print('>'.$metainfo.'<embed src="'.
379: $hash{'src_'.$rid}.'"></embed>');
380: }
381: $r->print('</td>');
382: }
383: $r->print('</tr>');
384: }
385: }
386: $r->print("\n</table>");
387: # ---------------------------------------------------------------- Submit, etc.
388: if ($nforms) {
389: $r->print(
390: '<input name="all_submit" value="Submit All" type="'.
391: (($nforms>1)?'submit':'hidden').'"></input></form>');
392: }
393: $r->print('</body></html>');
394: # -------------------------------------------------------------------- End page
395: }
396: # ------------------------------------------------------------- End render page
397: } else {
398: $r->content_type('text/html');
399: $r->send_http_header;
400: $r->print('<html><body>Page undefined.</body></html>');
401: }
402: # ------------------------------------------------------------------ Untie hash
403: unless (untie(%hash)) {
404: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
405: "Could not untie coursemap $fn (browse).</font>");
406: }
407: # -------------------------------------------------------------------- All done
408: return OK;
409: # ----------------------------------------------- Errors, hash could no be tied
410: }
411: }
412: }
413: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
414: return HTTP_NOT_ACCEPTABLE;
415: }
416:
417: 1;
418: __END__
419:
420:
421:
422:
423:
424:
425:
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