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 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->headers_only) {
99: $r->content_type('text/html');
100: $r->send_http_header;
101: # return OK;
102: # }
103:
104:
105:
106:
107:
108: $r->print('<html><body>'.$ENV{'form.postdata'}.'</body></html>');
109: return OK;
110:
111:
112:
113: my $requrl=$r->uri;
114: # ----------------------------------------------------------------- Tie db file
115: if ($ENV{'request.course.fn'}) {
116: my $fn=$ENV{'request.course.fn'};
117: if (-e "$fn.db") {
118: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
119: # ------------------------------------------------------------------- Hash tied
120: my $firstres=$hash{'map_start_'.$requrl};
121: my $lastres=$hash{'map_finish_'.$requrl};
122: if (($firstres) && ($lastres)) {
123: # ----------------------------------------------------------------- Render page
124:
125: @rows=();
126:
127: &tracetable(0,$firstres,'&'.$lastres.'&');
128: if ($hash{'src_'.$lastres}) {
129: my $brepriv=
130: &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
131: if (($brepriv eq '2') || ($brepriv eq 'F')) {
132: $rows[$#rows+1]=''.$lastres;
133: }
134: }
135:
136: # ------------------------------------------------------------ Add to symb list
137:
138: my $i;
139: my %symbhash=();
140: for ($i=0;$i<=$#rows;$i++) {
141: if ($rows[$i]) {
142: my @colcont=split(/\&/,$rows[$i]);
143: map {
144: $symbhash{$hash{'src_'.$_}}='';
145: } @colcont;
146: }
147: }
148: &Apache::lonnet::symblist($requrl,%symbhash);
149:
150: # ------------------------------------------------------------------ Page parms
151:
152: my $j;
153: my $lcm=1;
154: my $contents=0;
155: my $nforms=0;
156:
157: my %ssibody=();
158: my %ssibgcolor=();
159: my %ssitext=();
160: my %ssilink=();
161: my %ssivlink=();
162: my %ssialink=();
163: my %cellemb=();
164:
165: my $allscript='';
166: my $allmeta='';
167:
168: my $isxml=0;
169: my $xmlheader='';
170: my $xmlbody='';
171:
172: # --------------------------------------------- Get SSI output, post parameters
173:
174: for ($i=0;$i<=$#rows;$i++) {
175: if ($rows[$i]) {
176: $contents++;
177: my @colcont=split(/\&/,$rows[$i]);
178: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
179: map {
180: my $src=$hash{'src_'.$_};
181: $src=~/\.(\w+)$/;
182: $cellemb{$_}=Apache::lonnet::fileembstyle($1);
183: if ($cellemb{$_} eq 'ssi') {
184: # --------------------------------------------------------- This is an SSI cell
185: my $prefix=$_.'_';
186: my %posthash=('request.prefix' => $prefix);
187: if (($ENV{'form.'.$prefix.'submit'})
188: || ($ENV{'form.all_submit'})) {
189: map {
190: if ($_=~/^form.$prefix/) {
191: my $name=$_;
192: $name=~s/^form.$prefix//;
193: $posthash{$name}=$ENV{$_};
194: }
195: } keys %ENV;
196: }
197: my $output=Apache::lonnet::ssi($src,%posthash);
198: my $parser=HTML::TokeParser->new(\$output);
199: my $token;
200: my $bodydef=0;
201: my $thisxml=0;
202: if ($output=~/\?xml/) {
203: $isxml=1;
204: $thisxml=1;
205: $output=~
206: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
207: $xmlheader=$1;
208: }
209: while (($bodydef==0) &&
210: ($token=$parser->get_token)) {
211: if ($token->[1] eq 'body') {
212: $bodydef=1;
213: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
214: $ssitext{$_}=$token->[2]->{'text'};
215: $ssilink{$_}=$token->[2]->{'link'};
216: $ssivlink{$_}=$token->[2]->{'vlink'};
217: $ssialink{$_}=$token->[2]->{'alink'};
218: if ($thisxml) {
219: $xmlbody=$token->[4];
220: }
221: }
222: if ($token->[1] eq 'meta') {
223: $allmeta.="\n".$token->[4].'</meta>';
224: }
225: if ($token->[1] eq 'script') {
226: $allscript.="\n\n"
227: .$parser->get_text('/script');
228: }
229: }
230: if ($output=~/\<body[^\>]*\>(.*)/si) {
231: $output=$1;
232: }
233: $output=~s/\<\/body\>.*//si;
234: if ($output=~/\<form/si) {
235: $nforms++;
236: $output=~s/\<form[^\>]*\>//gsi;
237: $output=~s/\<\/form[^\>]*\>//gsi;
238: }
239: $ssibody{$_}=$output;
240:
241: # ---------------------------------------------------------------- End SSI cell
242: }
243: } @colcont;
244: }
245: }
246: unless ($contents) {
247: $r->content_type('text/html');
248: $r->send_http_header;
249: $r->print('<html><body>Empty page.</body></html>');
250: } else {
251: # ------------------------------------------------------------------ Build page
252:
253: # ---------------------------------------------------------------- Send headers
254: if ($isxml) {
255: $r->content_type('text/xml');
256: $r->send_http_header;
257: $r->print($xmlheader);
258: } else {
259: $r->content_type('text/html');
260: $r->send_http_header;
261: $r->print('<html>');
262: }
263: # ------------------------------------------------------------------------ Head
264: $r->print("\n<head>\n".$allmeta);
265: if ($allscript) {
266: $r->print("\n<script>\n".$allscript."\n</script>\n");
267: }
268: $r->print("\n</head>\n");
269: # ------------------------------------------------------------------ Start body
270: if ($isxml) {
271: $r->print($xmlbody);
272: } else {
273: $r->print('<body bgcolor="#FFFFFF">');
274: }
275: # ------------------------------------------------------------------ Start form
276: if ($nforms) {
277: $r->print('<form method="post" action="'.
278: $requrl.'">');
279: }
280: # ----------------------------------------------------------------- Start table
281: $r->print('<table cols="'.$lcm.'" border="0">');
282: for ($i=0;$i<=$#rows;$i++) {
283: if ($rows[$i]) {
284: $r->print("\n<tr>");
285: my @colcont=split(/\&/,$rows[$i]);
286: my $avespan=$lcm/($#colcont+1);
287: for ($j=0;$j<=$#colcont;$j++) {
288: my $rid=$colcont[$j];
289: $r->print('<td colspan="'.$avespan.'"');
290: if ($cellemb{$rid} eq 'ssi') {
291: if ($ssibgcolor{$rid}) {
292: $r->print(' bgcolor="'.
293: $ssibgcolor{$rid}.'"');
294: }
295: $r->print('><font');
296: if ($ssitext{$rid}) {
297: $r->print(' text="'.$ssitext{$rid}.'"');
298: }
299: if ($ssilink{$rid}) {
300: $r->print(' link="'.$ssilink{$rid}.'"');
301: }
302: if ($ssitext{$rid}) {
303: $r->print(' vlink="'.$ssivlink{$rid}.'"');
304: }
305: if ($ssialink{$rid}) {
306: $r->print(' alink="'.$ssialink{$rid}.'"');
307: }
308:
309: $r->print('>'.$ssibody{$rid}.'</font>');
310: } elsif ($cellemb{$rid} eq 'img') {
311: $r->print('><img src="'.
312: $hash{'src_'.$rid}.'"></img>');
313: }
314: $r->print('</td>');
315: }
316: $r->print('</tr>');
317: }
318: }
319: $r->print("\n</table>");
320: # ---------------------------------------------------------------- Submit, etc.
321: if ($nforms) {
322: $r->print(
323: '<input name="all_submit" value="Submit All" type="'.
324: (($nforms>1)?'submit':'hidden').'"></input></form>');
325: }
326: $r->print('</body></html>');
327: # -------------------------------------------------------------------- End page
328: }
329: # ------------------------------------------------------------- End render page
330: } else {
331: $r->content_type('text/html');
332: $r->send_http_header;
333: $r->print('<html><body>Page undefined.</body></html>');
334: }
335: # ------------------------------------------------------------------ Untie hash
336: unless (untie(%hash)) {
337: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
338: "Could not untie coursemap $fn (browse).</font>");
339: }
340: # -------------------------------------------------------------------- All done
341: return OK;
342: # ----------------------------------------------- Errors, hash could no be tied
343: }
344: }
345: }
346: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
347: return HTTP_NOT_ACCEPTABLE;
348: }
349:
350: 1;
351: __END__
352:
353:
354:
355:
356:
357:
358:
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