1/*  Part of ClioPatria SeRQL and SPARQL server
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        J.Wielemaker@vu.nl
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (c)  2007-2018, University of Amsterdam,
    7                              VU University Amsterdam
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
   14    1. Redistributions of source code must retain the above copyright
   15       notice, this list of conditions and the following disclaimer.
   16
   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
   19       the documentation and/or other materials provided with the
   20       distribution.
   21
   22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   25    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   26    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   27    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   28    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   29    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   30    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   32    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33    POSSIBILITY OF SUCH DAMAGE.
   34*/
   35
   36:- module(http_settings,
   37          [ http_show_settings/3,       % +Options
   38            http_apply_settings/4       % +Request, +Options
   39          ]).   40:- use_module(library('http/html_write')).   41:- use_module(library('http/html_head')).   42:- use_module(library('http/http_parameters')).   43:- use_module(library(option)).   44:- use_module(library(lists)).   45:- use_module(library(pairs)).   46:- use_module(library(debug)).   47:- use_module(library(settings)).

 http_show_settings(+Options)// is det

Emit an HTML representation of the current settings. Options:

edit(+Boolean)

hide_module(+Boolean)

If true, hide module headers from the user.

module(+ModuleList)

If present, only show settings from modules in ModuleList.

   61http_show_settings(Options) -->
   62    { findall(M-N, current_setting(M:N), List),
   63      keysort(List, Sorted),
   64      group_pairs_by_key(Sorted, ByModule)
   65    },
   66    (   { option(edit(true), Options, false),
   67          option(action(Action), Options, '/http/settings')
   68        }
   69    ->  html(form([ action(Action),
   70                    method('GET')
   71                  ],
   72                  table(class(block),
   73                        \settings_table(ByModule, Options))))
   74    ;   html([ table(class(block),
   75                     \settings_table(ByModule, Options))
   76             ])
   77    ).
   78
   79settings_table(ByModule, Options) -->
   80    (   {ByModule = [M-List],
   81        \+ option(hide_module(_), Options)
   82        }
   83    ->  show_module(M, List, [hide_module(true)|Options])
   84    ;   show_modules(ByModule, Options)
   85    ),
   86    (   { option(edit(true), Options, true) }
   87    ->  html(tr(class(buttons),
   88                td([ colspan(2),
   89                     align(right)
   90                   ],
   91                   [ input([ type(reset) ]),
   92                     input([ type(submit), value('Apply') ])
   93                   ])))
   94    ;   []
   95    ).
   96
   97
   98show_modules([], _) -->
   99    [].
  100show_modules([M-List|T], Options) -->
  101    show_module(M, List, Options),
  102    show_modules(T, Options).
  103
  104show_module(Module, _Settings, Options) -->
  105    { option(modules(ListOfModules), Options),
  106      \+ memberchk(Module,ListOfModules)
  107    },
  108    !.
  109show_module(Module, Settings, Options) -->
  110    show_module_header(Module, Options),
  111    show_settings(Settings, Module, odd, Options).
  112
  113show_module_header(_Module, Options) -->
  114    { option(hide_module(true), Options, false)},
  115    !.
  116show_module_header(Module, _Options) -->
  117    html(tr(th([colspan(2), class(group)], Module))).
  118
  119show_settings([], _, _, _) -->
  120    [].
  121show_settings([H|T], Module, EO, Options) -->
  122    show_setting(H, Module, EO, Options),
  123    { negate_odd_even(EO, EO2) },
  124    show_settings(T, Module, EO2, Options).
  125
  126show_setting(H, Module, EO, Options) -->
  127    { setting_property(Module:H, comment(Comment)),
  128      setting_property(Module:H, type(Type)),
  129      setting_title(Module:H, Title),
  130      setting(Module:H, Value),
  131      debug(settings, '~w: type=~w', [H, Type])
  132    },
  133    html(tr(class(EO),
  134            [ td([class(comment), title(Title)], Comment),
  135              td(class(value),
  136                 \show_value(Type, Value, Module:H, Options))
  137            ])).
  138
  139setting_title(Setting, Title) :-
  140    setting_property(Setting, File:Line),
  141    integer(Line),
  142    !,
  143    file_base_name(File, Base),
  144    format(atom(Title), '~q from ~w:~d', [Setting, Base, Line]).
  145setting_title(Setting, Title) :-
  146    format(atom(Title), '~q', [Setting]).
  147
  148
  149show_value(Type, Value, Id, Options) -->
  150    { option(edit(true), Options, true) },
  151    !,
  152    input_value(Type, Value, Id).
  153show_value(Type, Value, _, _Options) -->
  154    show_value(Type, Value).

 show_value(+Type, +Value)// is det

Emit a Value in non-editable representation.

  160show_value(list(Type), Values) -->
  161    !,
  162    html(div(class(list), \show_list(Values, Type, odd))).
  163show_value(_, Value) -->
  164    html('~w'-[Value]).
  165
  166show_list([], _, _) -->
  167    [].
  168show_list([H|T], Type, Class) -->
  169    html(div(class(elem_+Class), \show_value(Type, H))),
  170    { negate_odd_even(Class, NextClass) },
  171    show_list(T, Type, NextClass).

 input_value(+Type, +Value, +Id)// is det

Emit an form-field for Value.

  178:- multifile
  179    input_item/5.                   % input_item(+Type, +Value, +Id)//
  180
  181input_value(Type, Value, Id) -->
  182    { html_name(Id, Name) },
  183    (   input_item(Type, Value, Name)
  184    ->  []
  185    ;   builtin_input_item(Type, Value, Name)
  186    ).
  187
  188builtin_input_item(boolean, Value, Name) -->
  189    !,
  190    builtin_input_item(oneof([true,false]), Value, Name).
  191builtin_input_item(between(L,U), Value, Name) -->
  192    !,
  193    html(input([ type(range),
  194                 name(Name),
  195                 min(L), max(U), value(Value)
  196               ])).
  197builtin_input_item(oneof(List), Value, Name) -->
  198    !,
  199    html(select([name(Name)], \oneof(List, Value))).
  200builtin_input_item(atom, Value, Name) -->
  201    !,
  202    html(input([name(Name), size(40), value(Value)])).
  203builtin_input_item(_, Value, Name) -->
  204    { format(string(S), '~q', [Value])
  205    },
  206    html(input([name(Name), size(40), value(S)])).
  207
  208oneof([], _) -->
  209    [].
  210oneof([H|T], Value) -->
  211    (   {H == Value}
  212    ->  html([ option([selected(selected),value(H)], H) ])
  213    ;   html([ option([                   value(H)], H) ])
  214    ),
  215    oneof(T, Value).
  216
  217
  218                 /*******************************
  219                 *         APPLY SETTINGS       *
  220                 *******************************/

 http_apply_settings(+Request, +Options)// is det

Process form data created by http_show_settings//1, apply changes to the settings and create a feedback page indicating which settings have changed. Options:

save(Boolean)

If true and some settings have changed, call save_settings/0.

save_as(File)

If some settings have changed, call save_settings(File). The option save_as overrules save.

  236http_apply_settings(Request, Options) -->
  237    { http_parameters(Request, [],
  238                      [ form_data(Data)
  239                      ]),
  240      debug(settings, 'Form data: ~p', [Data]),
  241      phrase(process_settings_form(Data), Changes)
  242    },
  243    report_changed(Changes, Options).
  244
  245
  246report_changed([], _) -->
  247    html(div(class(msg_informational), 'No changes')).
  248report_changed(L, _) -->
  249    { memberchk(error(_), L) },
  250    report_errors(L).
  251report_changed(L, Options) -->
  252    { length(L, N),
  253      forall(member(change(Id, _, Value), L),
  254             set_setting(Id, Value)),
  255      (   option(save_as(File), Options)
  256      ->  save_settings(File)
  257      ;   option(save(true), Options, true)
  258      ->  save_settings
  259      ;   true
  260      )
  261    },
  262    html(div(class(msg_informational), ['Changed ', N, ' settings'])).
  263
  264report_errors([]) -->
  265    [].
  266report_errors([error(Error)|T]) -->
  267    report_error(Error),
  268    report_errors(T).
  269report_errors([_|T]) -->
  270    report_errors(T).
  271
  272report_error(no_setting(Id)) -->
  273    { format(string(Name), '~w', [Id]) },
  274    html(div(class(msg_error),
  275             ['Setting ', Name, ' does not exist.'])).
  276report_error(bad_value(Id, RawValue)) -->
  277    { format(string(Name), '~w', [Id]) },
  278    html(div(class(msg_error),
  279             ['Wrong value for ', Name, ': ', RawValue])).

 process_settings_form(+FormData)//

Process the raw form data, producing a list holding terms of the form:

• error(no_setting(Setting))
• error(bad_value(Setting, Value))
• change(Setting, Old, New)

  291process_settings_form([]) -->
  292    [].
  293process_settings_form([Name = Value|T]) -->
  294    (   { html_name(Setting, Name) }
  295    ->  process_form_field(Setting, Value)
  296    ;   [ error(no_setting(Name)) ]
  297    ),
  298    process_settings_form(T).
  299
  300process_form_field(Id, RawValue) -->
  301    (   { setting_property(Id, type(Type)) }
  302    ->  (   { catch(convert_setting_text(Type, RawValue, Value), _, fail) }
  303        ->  { setting(Id, OldValue) },
  304            (   { Value == OldValue }
  305            ->  []
  306            ;   [change(Id, OldValue, Value)]
  307            )
  308        ;   [ error(bad_value(Id, RawValue))]
  309        )
  310    ;   [ error(no_setting(Id)) ]
  311    ).
  312
  313
  314
  315                 /*******************************
  316                 *             UTIL             *
  317                 *******************************/

 html_name(+Settings, -Name) is det

html_name(-Settings, +Name) is det

Convert between Module:Setting and Name for use in form-fields.

  324html_name(Module:Setting, Name) :-
  325    atomic_list_concat([Module, Setting], ':', Name).

 negate_odd_even(+OddEven, -EventOdd)

  330negate_odd_even(odd, even).
  331negate_odd_even(even, odd)