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group.dylan
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group.dylan
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Module: %wiki
Synopsis: Group maintenance
// todo -- I don't like that these are mutable. It makes it hard to
// reason about the code. Probably goes for other objects too.
//
define class <wiki-group> (<wiki-object>)
slot group-owner :: <wiki-user>,
required-init-keyword: owner:;
constant slot group-members :: <stretchy-vector> = make(<stretchy-vector>),
init-keyword: members:;
slot group-description :: <string> = "",
init-keyword: description:;
end class <wiki-group>;
define method make
(class == <wiki-group>, #rest args, #key members :: <sequence> = #[])
=> (group :: <wiki-group>)
apply(next-method, class, members: as(<stretchy-vector>, members), args)
end;
define method initialize
(group :: <wiki-group>, #key)
add-new!(group.group-members, group.group-owner);
end;
// back compat
define inline function group-name
(group :: <wiki-group>) => (name :: <string>)
group.object-name
end;
// back compat
define inline function group-name-setter
(new-name :: <string>, group :: <wiki-group>) => (new-name :: <string>)
group.object-name := new-name
end;
// This is pretty restrictive for now. Easier to loosen the rules later
// than to tighten them up. The name has been pre-stripped and %-decoded.
//
define method validate-group-name
(name :: <string>) => (name :: <string>)
if (empty?(name))
error("Group is required.");
elseif (~regex-search(compile-regex("^[A-Za-z0-9_-]+$"), name))
error("Group names may contain only alphanumerics, hyphens and underscores.");
end;
name
end method validate-group-name;
// Must come up with a simpler, more general way to handle form errors...
define wf/error-test (name) in wiki end;
define method permanent-link
(group :: <wiki-group>)
=> (url :: <url>)
group-permanent-link(group)
end;
define method group-permanent-link
(group :: <wiki-group>)
=> (url :: <url>)
let location = wiki-url("/group/view/%s", group.group-name);
transform-uris(request-url(current-request()), location, as: <url>)
end;
define method redirect-to (group :: <wiki-group>)
redirect-to(permanent-link(group));
end;
// methods
define method find-group
(name :: <string>)
=> (group :: false-or(<wiki-group>))
element(*groups*, name, default: #f)
end;
/* unused
define method group-exists?
(name :: <string>) => (exists? :: <boolean>)
find-group(name) & #t
end;
*/
// Find all groups that a user is a member of.
//
define method user-groups
(user :: <wiki-user>)
=> (groups :: <collection>)
choose(method (group)
member?(user, group.group-members)
end,
value-sequence(*groups*))
end;
define method groups-owned-by-user
(user :: <wiki-user>)
=> (groups :: <collection>)
choose(method (group)
group.group-owner = user
end,
value-sequence(*groups*))
end;
define method rename-group
(name :: <string>, new-name :: <string>,
#key comment :: <string> = "")
=> ()
let group = find-group(name);
if (group)
rename-group(group, new-name, comment: comment)
end if;
end;
define method rename-group
(group :: <wiki-group>, new-name :: <string>,
#key comment :: <string> = "")
=> ()
let old-lc-name = as-lowercase(group.group-name);
let new-lc-name = as-lowercase(new-name);
if (old-lc-name ~= new-lc-name)
if (find-group(new-lc-name))
// TODO: raise more specific error...test...
// TODO: handle case-change-only rename.
error("group %s already exists", new-name);
end;
let comment = concatenate("was: ", group.group-name, ". ", comment);
with-lock ($group-lock)
remove-key!(*groups*, old-lc-name);
group.group-name := new-name;
*groups*[new-lc-name] := group;
end;
store(*storage*, group, authenticated-user(), comment,
standard-meta-data(group, "rename"));
end if;
end method rename-group;
define method create-group
(name :: <string>, #key comment :: <string> = "")
=> (group :: <wiki-group>)
let author = authenticated-user();
let group = make(<wiki-group>,
name: name,
owner: author);
store(*storage*, group, author, comment, standard-meta-data(group, "create"));
with-lock ($group-lock)
*groups*[name] := group;
end;
group
end method create-group;
define method add-member
(user :: <wiki-user>, group :: <wiki-group>,
#key comment :: <string> = "")
=> ()
add-new!(group.group-members, user);
let comment = concatenate("added ", user.user-name, ". ", comment);
store(*storage*, group, authenticated-user(), comment,
standard-meta-data(group, "add-members"));
end;
define method remove-member
(user :: <wiki-user>, group :: <wiki-group>,
#key comment :: <string> = "")
=> ()
remove!(group.group-members, user);
let comment = concatenate("removed ", user.user-name, ". ", comment);
store(*storage*, group, authenticated-user(), comment,
standard-meta-data(group, "remove-members"));
end;
define method remove-group
(group :: <wiki-group>, comment :: <string>)
=> ()
delete(*storage*, group, authenticated-user(), comment,
standard-meta-data(group, "delete"));
with-lock ($page-lock)
for (page in *pages*)
remove-rules-for-target(page.page-access-controls, group);
end;
end;
with-lock ($group-lock)
remove-key!(*groups*, group.group-name);
end;
end method remove-group;
//// List Groups (note not a subclass of <group-page>)
define class <list-groups-page> (<wiki-dsp>)
end;
define method respond-to-get
(page :: <list-groups-page>, #key)
local method group-info (group)
let len = group.group-members.size;
make-table(<string-table>,
"name" => group.group-name,
"count" => integer-to-string(len),
"s" => iff(len = 1, "", "s"),
"description" => quote-html(group.group-description))
end;
set-attribute(page-context(), "all-groups",
map(group-info, with-lock ($group-lock)
value-sequence(*groups*)
end));
next-method();
end method respond-to-get;
// Posting to /group/list creates a new group.
//
define method respond-to-post
(page :: <list-groups-page>, #key)
let user = authenticated-user();
let (new-name, error?) = validate-form-field("group", validate-group-name);
if (~error? & find-group(new-name))
add-field-error("group", "A group named %s already exists.", new-name);
end;
if (page-has-errors?())
respond-to-get(*list-groups-page*)
else
redirect-to(create-group(new-name));
end;
end method respond-to-post;
//// View Group
define class <view-group-page> (<wiki-dsp>)
end;
define method respond-to-get
(dsp :: <view-group-page>,
#key name :: <string>, version :: false-or(<string>))
let name = percent-decode(name);
let group = find-group(name);
set-group-page-attributes(name, group);
if (group)
process-template(dsp);
else
// Should only get here via a typed-in URL.
respond-to-get(*non-existing-group-page*);
end if;
end method respond-to-get;
// Idea: Could only define a respond-to-get/post method on <wiki-dsp> and
// have it call something like this, which could be specialized for
// each object type, then dispatch to something like "handle-get/post".
// I.e., have a standard way to set attributes on the page.
//
define function set-group-page-attributes
(name :: <string>, group :: false-or(<wiki-group>))
let pc = page-context();
set-attribute(pc, "group-name", name);
let user = authenticated-user();
if (user)
set-attribute(pc, "active-user", user.user-name);
end;
if (group)
set-attribute(pc, "group-owner", group.group-owner.user-name);
set-attribute(pc, "group-description", group.group-description);
set-attribute(pc, "group-members", sort(map(user-name, group.group-members)));
end;
end function set-group-page-attributes;
//// Edit Group
define class <edit-group-page> (<wiki-dsp>)
end;
define method respond-to-get
(dsp :: <edit-group-page>,
#key name :: <string>,
revision :: false-or(<string>)) // TODO:
let name = strip(percent-decode(name));
let group = find-group(name);
set-group-page-attributes(name, group);
process-template(dsp);
end;
define method respond-to-post
(dsp :: <edit-group-page>,
#key name :: <string>,
revision :: false-or(<string>)) // TODO:
let name = strip(percent-decode(name));
let group = find-group(name);
set-group-page-attributes(name, group);
if (~group)
// foreign post?
respond-to-get(*non-existing-group-page*);
else
let new-name = validate-form-field("group-name", validate-group-name);
let owner-name = validate-form-field("group-owner", validate-user-name);
let new-owner = find-user(owner-name);
let comment = strip(get-query-value("comment") | "");
let description = strip(get-query-value("group-description") | "");
if (empty?(description))
add-field-error("group-description", "A description is required.");
end;
if (~new-owner)
add-field-error("group-owner", "User %s unknown", owner-name);
end;
if (new-name ~= name & find-group(new-name))
add-field-error("group-name",
"A group named %s already exists.", new-name);
end;
if (page-has-errors?())
// redisplay page with errors
process-template(dsp);
else
// todo -- the rename and save should be part of a transaction.
if (new-name ~= name)
rename-group(group, new-name, comment: comment);
name := new-name;
end;
if (description ~= group.group-description
| new-owner ~= group.group-owner)
group.group-description := description;
group.group-owner := new-owner;
store(*storage*, group, authenticated-user(), comment,
standard-meta-data(group, "edit"));
end;
redirect-to(group);
end if;
end if;
end method respond-to-post;
//// Remove Group
define class <remove-group-page> (<wiki-dsp>)
end;
define method respond-to-get
(dsp :: <remove-group-page>, #key name :: <string>)
let name = percent-decode(name);
let group = find-group(name);
set-group-page-attributes(name, group);
process-template(dsp);
end;
define method respond-to-post
(page :: <remove-group-page>, #key name :: <string>)
let name = percent-decode(name);
let group = find-group(name);
set-group-page-attributes(name, group);
if (group)
let author = authenticated-user();
if (author & (author = group.group-owner | administrator?(author)))
remove-group(group, get-query-value("comment") | "");
add-page-note("Group %s removed", name);
else
add-page-error("You do not have permission to remove this group.")
end;
// hack hack. Should have some idea where the user wants to go via
// the 'redirect' parameter, or something like that.
respond-to-get(*list-groups-page*);
else
respond-to-get(*non-existing-group-page*);
end;
end method respond-to-post;
//// Edit Group Members
// TODO: It should be possible to edit the group name, owner,
// and members all in one page.
define class <edit-group-members-page> (<wiki-dsp>)
end;
define method respond-to-get
(page :: <edit-group-members-page>,
#key name :: <string>, must-exist :: <boolean> = #t)
let name = percent-decode(name);
let group = find-group(name);
set-group-page-attributes(name, group);
if (group)
with-lock ($user-lock)
// Note: user must be logged in. That check is done in the template.
// non-members is for the add/remove members page
set-attribute(page-context(),
"non-members",
sort(map(user-name,
choose(method (u)
~member?(u, group.group-members)
end,
value-sequence(*users*)))));
// Add all users to the page context so they can be selected
// for group membership.
set-attribute(page-context(),
"all-users",
sort(key-sequence(*users*)));
end with-lock;
end if;
next-method();
end method respond-to-get;
define method respond-to-post
(page :: <edit-group-members-page>, #key name :: <string>)
let name = percent-decode(name);
let group = find-group(name);
if (group)
with-query-values (add as add?, remove as remove?, users, members, comment)
if (add? & users)
if (instance?(users, <string>))
users := list(users);
end if;
let users = choose(identity, map(find-user, users));
do(rcurry(add-member, group, comment:, comment), users);
elseif (remove? & members)
if (instance?(members, <string>))
members := list(members);
end if;
let members = choose(identity, map(find-user, members));
do(rcurry(remove-member, group, comment:, comment), members);
end if;
respond-to-get(page, name: name);
end;
else
respond-to-get(*non-existing-group-page*);
end;
end method respond-to-post;
define named-method can-modify-group?
(page :: <wiki-dsp>)
let user = authenticated-user();
user & (administrator?(user)
| user.user-name = get-attribute(page-context(), "active-user"));
end;