1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
5: # (Page Handler
6: #
7: # (TeX Content Handler
8: #
9: # 05/29/00,05/30 Gerd Kortemeyer)
10: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
11: # 10/02 Gerd Kortemeyer)
12: #
13: # 10/03,10/05 Gerd Kortemeyer
14:
15: package Apache::lonpageflip;
16:
17: use strict;
18: use Apache::Constants qw(:common :http);
19: use Apache::lonnet();
20: use HTML::TokeParser;
21: use GDBM_File;
22:
23: # -------------------------------------------------------------- Module Globals
24: my %hash;
25: my @rows;
26:
27: # ------------------------------------------------------------------ Euclid gcd
28:
29: sub euclid {
30: my ($e,$f)=@_;
31: my $a; my $b; my $r;
32: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
33: while ($r!=0) {
34: $a=$b; $b=$r;
35: $r=$a%$b;
36: }
37: return $b;
38: }
39:
40: # ------------------------------------------------------------ Build page table
41:
42: sub tracetable {
43: my ($sofar,$rid,$beenhere)=@_;
44: my $further=$sofar;
45: unless ($beenhere=~/\&$rid\&/) {
46: $beenhere.=$rid.'&';
47:
48: if (defined($hash{'is_map_'.$rid})) {
49: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
50: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
51: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
52: $sofar=
53: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
54: '&'.$frid.'&');
55: $sofar++;
56: if ($hash{'src_'.$frid}) {
57: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
58: if (($brepriv eq '2') || ($brepriv eq 'F')) {
59: if (defined($rows[$sofar])) {
60: $rows[$sofar].='&'.$frid;
61: } else {
62: $rows[$sofar]=$frid;
63: }
64: }
65: }
66: }
67: } else {
68: $sofar++;
69: if ($hash{'src_'.$rid}) {
70: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
71: if (($brepriv eq '2') || ($brepriv eq 'F')) {
72: if (defined($rows[$sofar])) {
73: $rows[$sofar].='&'.$rid;
74: } else {
75: $rows[$sofar]=$rid;
76: }
77: }
78: }
79: }
80:
81: if (defined($hash{'to_'.$rid})) {
82: map {
83: my $now=&tracetable($sofar,$hash{'goesto_'.$_},$beenhere);
84: if ($now>$further) { $further=$now; }
85: } split(/\,/,$hash{'to_'.$rid});
86: }
87: }
88: return $further;
89: }
90:
91: # ================================================================ Main Handler
92:
93: sub handler {
94: my $r=shift;
95:
96: # ------------------------------------------- Set document type for header only
97:
98: if ($r->header_only) {
99: $r->content_type('text/html');
100: $r->send_http_header;
101: return OK;
102: }
103:
104:
105: # --------BEGIN DEBUG ONLY TRASH
106: $r->content_type('text/html');
107: $r->send_http_header;
108:
109: $r->print('<html><body>');
110: # --------END DEBUG ONLY TRASH
111:
112:
113: if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) {
114: $ENV{'form.postdata'}=~/(\w+)\:(.*)/;
115: my $direction=$1;
116: my $currenturl=$2;
117: my $redirecturl=$currenturl;
118: $currenturl=~s/^http\:\/\///;
119: $currenturl=~s/^[^\/]+//;
120: $currenturl=Apache::lonnet::declutter($currenturl);
121: # ---------------------------------------------------------------- Tie database
122: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
123: &GDBM_READER,0640)) {
124: # ---------------------------------------------- Get ID(s) for current resource
125: my $syval=$hash{'ids_/res/'.$currenturl};
126: if ($syval) {
127: # ------------------------------------------------------------------- Has ID(s)
128: my @possiblities=split(/\,/,$syval);
129: $r->print($direction.' '.$currenturl.' '.$syval);
130:
131: } else {
132: # --------------------------------------------------------- Does not have ID(s)
133: $r->print('Weird');
134: }
135: # ------------------------------------- Program needs to get here to untie hash
136: unless(untie(%hash)) {
137: $r->log_reason('Could not untie database hash '.
138: $ENV{'request.course.fn'}.' for '.$ENV{'user.name'}.
139: ' at '.$ENV{'user.domain'});
140: return HTTP_SERVICE_UNAVAILABLE;
141: }
142: # ------------------------------------------------------------ Now do something
143: } else {
144: # ----------------------------------------- Serious problem, could not tie hash
145: $r->log_reason('Could not tie database hash '.
146: $ENV{'request.course.fn'}.' for '.$ENV{'user.name'}.
147: ' at '.$ENV{'user.domain'});
148: return HTTP_SERVICE_UNAVAILABLE;
149: }
150: # -------------------------- Class was not initialized or page fliped strangely
151: } else {
152: $ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
153: return HTTP_NOT_ACCEPTABLE;
154: }
155:
156:
157:
158:
159: # ------TRASH BELOW
160: # --------------------------- TRASH
161:
162: $r->print('</body></html>');
163: return OK;
164:
165:
166: # ========================================================= TOTAL TRASH
167:
168: my $requrl=$r->uri;
169: # ----------------------------------------------------------------- Tie db file
170: if ($ENV{'request.course.fn'}) {
171: my $fn=$ENV{'request.course.fn'};
172: if (-e "$fn.db") {
173: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
174: # ------------------------------------------------------------------- Hash tied
175: my $firstres=$hash{'map_start_'.$requrl};
176: my $lastres=$hash{'map_finish_'.$requrl};
177: if (($firstres) && ($lastres)) {
178: # ----------------------------------------------------------------- Render page
179:
180: @rows=();
181:
182: &tracetable(0,$firstres,'&'.$lastres.'&');
183: if ($hash{'src_'.$lastres}) {
184: my $brepriv=
185: &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
186: if (($brepriv eq '2') || ($brepriv eq 'F')) {
187: $rows[$#rows+1]=''.$lastres;
188: }
189: }
190:
191: # ------------------------------------------------------------ Add to symb list
192:
193: my $i;
194: my %symbhash=();
195: for ($i=0;$i<=$#rows;$i++) {
196: if ($rows[$i]) {
197: my @colcont=split(/\&/,$rows[$i]);
198: map {
199: $symbhash{$hash{'src_'.$_}}='';
200: } @colcont;
201: }
202: }
203: &Apache::lonnet::symblist($requrl,%symbhash);
204:
205: # ------------------------------------------------------------------ Page parms
206:
207: my $j;
208: my $lcm=1;
209: my $contents=0;
210: my $nforms=0;
211:
212: my %ssibody=();
213: my %ssibgcolor=();
214: my %ssitext=();
215: my %ssilink=();
216: my %ssivlink=();
217: my %ssialink=();
218: my %cellemb=();
219:
220: my $allscript='';
221: my $allmeta='';
222:
223: my $isxml=0;
224: my $xmlheader='';
225: my $xmlbody='';
226:
227: # --------------------------------------------- Get SSI output, post parameters
228:
229: for ($i=0;$i<=$#rows;$i++) {
230: if ($rows[$i]) {
231: $contents++;
232: my @colcont=split(/\&/,$rows[$i]);
233: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
234: map {
235: my $src=$hash{'src_'.$_};
236: $src=~/\.(\w+)$/;
237: $cellemb{$_}=Apache::lonnet::fileembstyle($1);
238: if ($cellemb{$_} eq 'ssi') {
239: # --------------------------------------------------------- This is an SSI cell
240: my $prefix=$_.'_';
241: my %posthash=('request.prefix' => $prefix);
242: if (($ENV{'form.'.$prefix.'submit'})
243: || ($ENV{'form.all_submit'})) {
244: map {
245: if ($_=~/^form.$prefix/) {
246: my $name=$_;
247: $name=~s/^form.$prefix//;
248: $posthash{$name}=$ENV{$_};
249: }
250: } keys %ENV;
251: }
252: my $output=Apache::lonnet::ssi($src,%posthash);
253: my $parser=HTML::TokeParser->new(\$output);
254: my $token;
255: my $bodydef=0;
256: my $thisxml=0;
257: if ($output=~/\?xml/) {
258: $isxml=1;
259: $thisxml=1;
260: $output=~
261: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
262: $xmlheader=$1;
263: }
264: while (($bodydef==0) &&
265: ($token=$parser->get_token)) {
266: if ($token->[1] eq 'body') {
267: $bodydef=1;
268: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
269: $ssitext{$_}=$token->[2]->{'text'};
270: $ssilink{$_}=$token->[2]->{'link'};
271: $ssivlink{$_}=$token->[2]->{'vlink'};
272: $ssialink{$_}=$token->[2]->{'alink'};
273: if ($thisxml) {
274: $xmlbody=$token->[4];
275: }
276: }
277: if ($token->[1] eq 'meta') {
278: $allmeta.="\n".$token->[4].'</meta>';
279: }
280: if ($token->[1] eq 'script') {
281: $allscript.="\n\n"
282: .$parser->get_text('/script');
283: }
284: }
285: if ($output=~/\<body[^\>]*\>(.*)/si) {
286: $output=$1;
287: }
288: $output=~s/\<\/body\>.*//si;
289: if ($output=~/\<form/si) {
290: $nforms++;
291: $output=~s/\<form[^\>]*\>//gsi;
292: $output=~s/\<\/form[^\>]*\>//gsi;
293: }
294: $ssibody{$_}=$output;
295:
296: # ---------------------------------------------------------------- End SSI cell
297: }
298: } @colcont;
299: }
300: }
301: unless ($contents) {
302: $r->content_type('text/html');
303: $r->send_http_header;
304: $r->print('<html><body>Empty page.</body></html>');
305: } else {
306: # ------------------------------------------------------------------ Build page
307:
308: # ---------------------------------------------------------------- Send headers
309: if ($isxml) {
310: $r->content_type('text/xml');
311: $r->send_http_header;
312: $r->print($xmlheader);
313: } else {
314: $r->content_type('text/html');
315: $r->send_http_header;
316: $r->print('<html>');
317: }
318: # ------------------------------------------------------------------------ Head
319: $r->print("\n<head>\n".$allmeta);
320: if ($allscript) {
321: $r->print("\n<script>\n".$allscript."\n</script>\n");
322: }
323: $r->print("\n</head>\n");
324: # ------------------------------------------------------------------ Start body
325: if ($isxml) {
326: $r->print($xmlbody);
327: } else {
328: $r->print('<body bgcolor="#FFFFFF">');
329: }
330: # ------------------------------------------------------------------ Start form
331: if ($nforms) {
332: $r->print('<form method="post" action="'.
333: $requrl.'">');
334: }
335: # ----------------------------------------------------------------- Start table
336: $r->print('<table cols="'.$lcm.'" border="0">');
337: for ($i=0;$i<=$#rows;$i++) {
338: if ($rows[$i]) {
339: $r->print("\n<tr>");
340: my @colcont=split(/\&/,$rows[$i]);
341: my $avespan=$lcm/($#colcont+1);
342: for ($j=0;$j<=$#colcont;$j++) {
343: my $rid=$colcont[$j];
344: $r->print('<td colspan="'.$avespan.'"');
345: if ($cellemb{$rid} eq 'ssi') {
346: if ($ssibgcolor{$rid}) {
347: $r->print(' bgcolor="'.
348: $ssibgcolor{$rid}.'"');
349: }
350: $r->print('><font');
351: if ($ssitext{$rid}) {
352: $r->print(' text="'.$ssitext{$rid}.'"');
353: }
354: if ($ssilink{$rid}) {
355: $r->print(' link="'.$ssilink{$rid}.'"');
356: }
357: if ($ssitext{$rid}) {
358: $r->print(' vlink="'.$ssivlink{$rid}.'"');
359: }
360: if ($ssialink{$rid}) {
361: $r->print(' alink="'.$ssialink{$rid}.'"');
362: }
363:
364: $r->print('>'.$ssibody{$rid}.'</font>');
365: } elsif ($cellemb{$rid} eq 'img') {
366: $r->print('><img src="'.
367: $hash{'src_'.$rid}.'"></img>');
368: }
369: $r->print('</td>');
370: }
371: $r->print('</tr>');
372: }
373: }
374: $r->print("\n</table>");
375: # ---------------------------------------------------------------- Submit, etc.
376: if ($nforms) {
377: $r->print(
378: '<input name="all_submit" value="Submit All" type="'.
379: (($nforms>1)?'submit':'hidden').'"></input></form>');
380: }
381: $r->print('</body></html>');
382: # -------------------------------------------------------------------- End page
383: }
384: # ------------------------------------------------------------- End render page
385: } else {
386: $r->content_type('text/html');
387: $r->send_http_header;
388: $r->print('<html><body>Page undefined.</body></html>');
389: }
390: # ------------------------------------------------------------------ Untie hash
391: unless (untie(%hash)) {
392: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
393: "Could not untie coursemap $fn (browse).</font>");
394: }
395: # -------------------------------------------------------------------- All done
396: return OK;
397: # ----------------------------------------------- Errors, hash could no be tied
398: }
399: }
400: }
401: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
402: return HTTP_NOT_ACCEPTABLE;
403: }
404:
405: 1;
406: __END__
407:
408:
409:
410:
411:
412:
413:
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