Annotation of rat/lonsequence.pm, revision 1.2
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # (Handler to resolve ambiguous file locations
6: #
7: # (TeX Content Handler
8: #
9: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
10: #
11: # 10/11,10/12 Gerd Kortemeyer)
12: #
13: # 10/16 Gerd Kortemeyer
14:
15: package Apache::lonambiguous;
16:
17: use strict;
18: use Apache::lonnet;
19: use Apache::Constants qw(:common REDIRECT);
20: use GDBM_File;
21:
22:
23: # ----------------------------------------------------------- Could not resolve
24:
25: sub getlost {
26: my ($r,$errmsg)=@_;
27: $r->content_type('text/html');
28: $r->send_http_header;
29: $r->print(
30: '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
31: 'LON-CAPA</h1>Could not handle ambiguous resource reference.<p>'.$errmsg.
32: '</body></html>');
33: }
34:
35: # ================================================================ Main Handler
36:
37: sub handler {
38: my $r=shift;
39:
40: if ($r->header_only) {
41: $r->content_type('text/html');
42: $r->send_http_header;
43: return OK;
44: }
45:
1.2 ! www 46: my %hash;
1.1 www 47: my %bighash;
1.2 ! www 48: my $requrl=$r->uri;
! 49:
1.1 www 50: # ----------------------------------------------------------------- Tie db file
51: if ($ENV{'request.course.fn'}) {
1.2 ! www 52: my $last;
! 53: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
! 54: &GDBM_READER,0640)) {
! 55: $last=$hash{'last_direction'};
! 56: untie(%hash);
! 57: }
1.1 www 58: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
59: &GDBM_READER,0640)) {
1.2 ! www 60: my $direction='';
! 61: my $prevmap='';
! 62: if ($last) {
! 63: ($prevmap,$direction)=(split(/\_\_\_/,$last));
! 64: }
! 65:
! 66: # ===== Stuff goes here
1.1 www 67: foreach $envkey (keys %ENV) {
68: if ($envkey=~/^form\.(\d+)\.(\d+)$/) {
69: my $mapid=$1;
70: my $resid=$2;
71: my $resurl=$bighash{'src_'.$mapid.'.'.$resid};
72: &Apache::lonnet::symblist($bighash{'map_id_'.$mapid},
73: $resurl => $resid);
74: $r->header_out(Location =>
75: 'http://'.$ENV{'HTTP_HOST'}.$resurl);
76: return REDIRECT;
77: }
78: }
79: untie(%bighash);
80: } else {
81: &getlost($r,'Could not access course structure.');
82: return OK;
83: }
84: } else {
85: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
86: return HTTP_NOT_ACCEPTABLE;
87: }
88:
89: return OK;
90:
91: # ================================================================= TRASH BELOW
92:
93: # ---------------------------------------------------------- Do we have a case?
94:
95: my $thisfn;
96: unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) {
97: &getlost($r,'Could not find information on resource.');
98: return OK;
99: }
100:
101: # ---------------------------------- Should this file have been part of a page?
102:
103: $thisfn=&Apache::lonnet::declutter($thisfn);
104: my %hash;
105: my $syval='';
106:
107: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
108: &GDBM_READER,0640)) {
109: $syval=$hash{$thisfn};
110: untie(%hash);
111: }
112:
113: # ---------------------------------------------------------- There was an entry
114:
115: if ($syval) {
116:
117: if ($syval=~/\_$/) {
118: # ----------------------------------- Okay, this should have appeared on a page
119: $syval=~s/\_\_\_$//;
120: $r->content_type('text/html');
121: $r->header_out(Location =>
122: 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval);
123: return REDIRECT;
124: } else {
125: # There is not really a problem (???), but cannot go back without endless loop
126: &getlost($r,'The nature of the problem is unclear');
127: return OK;
128: }
129: }
130:
131: # ------------------------------------------------ Would be standalone resource
132:
133: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
134: &GDBM_READER,0640)) {
135: # ---------------------------------------------- Get ID(s) for current resource
136: my $ids=$bighash{'ids_/res/'.$thisfn};
137: if ($ids) {
138: # ------------------------------------------------------------------- Has ID(s)
139: my @possibilities=split(/\,/,$ids);
140: my $couldbe='';
141: map {
142: if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) {
143: if ($couldbe) {
144: $couldbe.=','.$_;
145: } else {
146: $couldbe=$_;
147: }
148: }
149: } @possibilities;
150: if ($couldbe) {
151: @possibilities=split(/\,/,$couldbe);
152: if ($#possibilities>0) {
153: # ----------------------------------------------- Okay, really multiple choices
154: $r->content_type('text/html');
155: $r->send_http_header;
156: $r->print(<<ENDSTART);
157: <head><title>Choose Location</title></head>
158: <body bgcolor="#FFFFFF">
159: <h1>LON-CAPA</h1>
160: The resource you had been accessing appears more than once in this course,
161: and LON-CAPA has insufficient session information to determine which instance
162: of the resource you meant.
163: <p>
164: Please click on the instance of the resource you intended to access:
165: <p>
166: <form action="/adm/ambiguous" method=post>
167: <input type=hidden name=orgurl value="$thisfn">
168: <input type=hidden name=selecturl value=1>
169: <table border=2>
170: <tr><th> </th><th>Title</th><th>Type</th><th>Part of ...</th></tr>
171: ENDSTART
172: map {
173: my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]};
174: $r->print('<tr><td><input type=submit value=Select name="'.
175: $_.'"></td><td>'.$bighash{'title_'.$_}.
176: '</td><td>'.$bighash{'type_'.$_}.
177: '</td><td><a href="'.$mapurl.'">'.$mapurl.
178: '</a></td></tr>');
179: } @possibilities;
180: $r->print('</table></form></body></html>');
181: untie(%bighash);
182: return OK;
183: }
184: }
185: }
186: untie(%bighash);
187: }
188:
189: # ------------------------------------ This handler should not have been called
190: &getlost($r,'Invalid call of handler');
191: return OK;
192: }
193:
194: 1;
195: __END__
196:
197:
198:
199:
200:
201:
202:
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