1 (* COCANWIKI - a wiki written in Objective CAML.
2 * Written by Richard W.M. Jones <rich@merjis.com>.
3 * Copyright (C) 2004 Merjis Ltd.
4 * $Id: cocanwiki.ml,v 1.2 2004/10/30 10:16:10 rich Exp $
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
28 open Cocanwiki_strings
30 module Pool = DbiPool (Dbi_postgres)
32 (* This function is used to grab a database handle. It's used in a couple
33 * of very special places, and is not for general consumption.
35 let _get_dbh r = Pool.get r "cocanwiki"
37 (* The "host object". *)
38 type host_t = { hostname : string;
39 canonical_hostname : string;
43 (* Permissions and restrictions.
45 * Use the optional ~restrict parameter to register_script to restrict
46 * who can use the script. For example:
47 * register_script ~restrict:[CanEdit ; CanManageUsers] run
49 type permissions_t = CanView | CanEdit | CanManageUsers | CanManageContacts
50 | CanManageSite | CanEditGlobalCSS | CanImportMail
52 (* User preferences and other settings (some cannot be changed by the user). *)
54 email : string option; (* Email address. *)
55 email_notify : bool; (* Email notification. *)
56 diff_sidebyside : bool; (* Shows diffs side-by-side. *)
59 (* The "user object". *)
60 type user_t = Anonymous (* Not logged in. *)
61 | User of int * string * permissions_t list * prefs_t
62 (* Userid, name, perms, prefs. *)
64 let test_permission {edit_anon = edit_anon; view_anon = view_anon} perm user =
65 if perm = CanEdit && edit_anon then true
66 else if perm = CanView && view_anon then true
69 | User (_, _, perms, _) -> List.mem perm perms
71 let can_edit host = test_permission host CanEdit
72 let can_manage_users host = test_permission host CanManageUsers
73 let can_manage_contacts host = test_permission host CanManageContacts
74 let can_manage_site host = test_permission host CanManageSite
75 let can_edit_global_css host = test_permission host CanEditGlobalCSS
76 let can_import_mail host = test_permission host CanImportMail
78 (* Our wrapper around the standard [register_script] function.
80 * The optional ~restrict and ~anonymous parameters work as follows:
82 * By default (neither parameter given), anonymous or logged-in users
83 * at any level are permitted to run the script.
85 * If ~anonymous:false then a user must be logged in to use the script.
87 * If ~restrict contains a list of permissions (eg. CanEdit, etc.) then
88 * the user must have the ability to do AT LEAST ONE of those actions.
89 * (Note that this does not necessarily imply that the user must be
90 * logged in, because in some circumstances even anonymous users have
91 * the CanEdit permission - very typical for a wiki).
93 * If ~anonymous:false and ~restrict is given then the user must be
94 * logged in AND have the ability to do AT LEAST ONE of those actions.
96 let register_script ?(restrict = []) ?(anonymous = true) run =
97 (* Actually register the script with the real [Registry] module. *)
101 let dbh = _get_dbh r in
103 (* Get the host ID, by comparing the Host: header with the hostnames
104 * table in the database.
106 let hostid, hostname, canonical_hostname, edit_anon, view_anon =
107 let hostname = try Request.hostname r
108 with Not_found -> failwith "No ``Host:'' header in request" in
109 let hostname = String.lowercase hostname in
113 "select h.id, h.canonical_hostname, h.edit_anon, h.view_anon
114 from hostnames hn, hosts h
115 where hn.name = ? and hn.hostid = h.id" in
116 sth#execute [`String hostname];
119 (match sth#fetch1 () with
120 [ `Int id; `String canonical_hostname;
121 `Bool edit_anon; `Bool view_anon ] ->
122 id, hostname, canonical_hostname, edit_anon, view_anon
126 failwith ("Hostname ``" ^ hostname ^ "'' not found in " ^
127 "the hosts/hostnames tables in the database.") in
129 (* Create the host object. *)
130 let host = { hostname = hostname;
131 canonical_hostname = canonical_hostname;
132 edit_anon = edit_anon;
133 view_anon = view_anon } in
135 (* Look for the user's cookie, and determine from this the user
141 (* Allow the user to deliberately specify an extra "cookie"
142 * parameter, which we will send back as a cookie. This is
143 * useful for "mail my password"-type scripts.
145 if q#param_exists "cookie" then (
146 let value = q#param "cookie" in
147 let cookie = Cookie.cookie ~name:"auth" ~value ~path:"/" () in
148 Table.set (Request.headers_out r) "Set-Cookie" cookie#as_string;
151 (* Normal cookie, from the headers. *)
152 let header = Table.get (Request.headers_in r) "Cookie" in
153 let cookies = Cookie.parse header in
155 List.find (fun cookie -> cookie#name = "auth") cookies in
161 "select u.id, u.name, u.can_edit, u.can_manage_users,
162 u.can_manage_contacts, u.can_manage_site,
163 u.can_edit_global_css, u.can_import_mail,
164 u.email, u.email_notify, u.diff_sidebyside
165 from usercookies uc, users u
166 where uc.cookie = ? and uc.userid = u.id and u.hostid = ?" in
167 sth#execute [`String cookie; `Int hostid];
168 (match sth#fetch1 () with
169 [ `Int userid; `String name;
170 `Bool can_edit; `Bool can_manage_users;
171 `Bool can_manage_contacts; `Bool can_manage_site;
172 `Bool can_edit_global_css; `Bool can_import_mail;
173 (`Null | `String _) as email; `Bool email_notify;
174 `Bool diff_sidebyside ] ->
175 (* Every logged in user can view. *)
176 let perms = [CanView] in
178 if can_edit then CanEdit :: perms
181 if can_manage_users then CanManageUsers :: perms
184 if can_manage_contacts then CanManageContacts :: perms
187 if can_manage_site then CanManageSite :: perms
190 if can_edit_global_css then CanEditGlobalCSS :: perms
193 if can_import_mail then CanImportMail :: perms
199 | `String email -> Some email in
200 let prefs = { email = email;
201 email_notify = email_notify;
202 diff_sidebyside = diff_sidebyside } in
203 User (userid, name, perms, prefs)
206 Not_found -> Anonymous
209 (* If the ~restrict parameter is given, then we want to check that
210 * the user has sufficient permission to run this script.
213 if not anonymous && user = Anonymous then false
216 [] -> true (* empty list = no restrictions *)
218 List.fold_left (||) false
219 (List.map (fun r -> test_permission host r user) rs) in
222 (* Call the actual CGI script. *)
223 run r q dbh hostid host user
225 if user = Anonymous then
226 q#redirect ("http://" ^ hostname ^ "/_login")
228 error ~back_button:true
229 ~title:"Access denied"
230 q "You do not have permission to access this part of the site."
234 (* Convert a section name into something valid for use in <a name="...">
235 * XXX This breaks horribly for non-7-bit strings.
236 * XXX This is stuck here because we don't have a good place for it, and
237 * because it needs to be fixed for i18n compliance.
239 let linkname_of_sectionname str =
240 let str = String.copy str in
241 for i = 0 to String.length str - 1 do
242 if not (isalnum str.[i]) then str.[i] <- '_'
246 (* List of extensions currently registered. *)
247 type extension_t = Dbi.connection -> int -> string -> string
248 let extensions = ref ([] : (string * extension_t) list)
250 (* Maximum degree of redirection. *)