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annotate src/settings.sml @ 770:c125df6fabfc

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Runtime URL and MIME type filtering
author Adam Chlipala <adamc@hcoop.net>
date Sat, 02 May 2009 18:20:15 -0400
parents efceae06df17
children 7394368a5cad
rev   line source
adamc@764 1 (* Copyright (c) 2008-2009, Adam Chlipala
adamc@764 2 * All rights reserved.
adamc@764 3 *
adamc@764 4 * Redistribution and use in source and binary forms, with or without
adamc@764 5 * modification, are permitted provided that the following conditions are met:
adamc@764 6 *
adamc@764 7 * - Redistributions of source code must retain the above copyright notice,
adamc@764 8 * this list of conditions and the following disclaimer.
adamc@764 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@764 10 * this list of conditions and the following disclaimer in the documentation
adamc@764 11 * and/or other materials provided with the distribution.
adamc@764 12 * - The names of contributors may not be used to endorse or promote products
adamc@764 13 * derived from this software without specific prior written permission.
adamc@764 14 *
adamc@764 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@764 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@764 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@764 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@764 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@764 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@764 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@764 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@764 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@764 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@764 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@764 26 *)
adamc@764 27
adamc@764 28 structure Settings :> SETTINGS = struct
adamc@764 29
adamc@764 30 val urlPrefix = ref "/"
adamc@764 31 val timeout = ref 0
adamc@764 32 val headers = ref ([] : string list)
adamc@766 33 val scripts = ref ([] : string list)
adamc@764 34
adamc@764 35 fun getUrlPrefix () = !urlPrefix
adamc@764 36 fun setUrlPrefix p =
adamc@764 37 urlPrefix := (if p = "" then
adamc@764 38 "/"
adamc@764 39 else if String.sub (p, size p - 1) <> #"/" then
adamc@764 40 p ^ "/"
adamc@764 41 else
adamc@764 42 p)
adamc@764 43
adamc@764 44 fun getTimeout () = !timeout
adamc@764 45 fun setTimeout n = timeout := n
adamc@764 46
adamc@764 47 fun getHeaders () = !headers
adamc@764 48 fun setHeaders ls = headers := ls
adamc@764 49
adamc@766 50 fun getScripts () = !scripts
adamc@766 51 fun setScripts ls = scripts := ls
adamc@766 52
adamc@765 53 type ffi = string * string
adamc@765 54
adamc@765 55 structure K = struct
adamc@765 56 type ord_key = ffi
adamc@765 57 fun compare ((m1, x1), (m2, x2)) =
adamc@765 58 Order.join (String.compare (m1, m2),
adamc@765 59 fn () => String.compare (x1, x2))
adamc@764 60 end
adamc@765 61
adamc@765 62 structure S = BinarySetFn(K)
adamc@765 63 structure M = BinaryMapFn(K)
adamc@765 64
adamc@765 65 fun basis x = S.addList (S.empty, map (fn x : string => ("Basis", x)) x)
adamc@765 66
adamc@765 67 val clientToServerBase = basis ["int",
adamc@765 68 "float",
adamc@765 69 "string",
adamc@765 70 "time",
adamc@765 71 "file",
adamc@765 72 "unit",
adamc@765 73 "option",
adamc@765 74 "list",
adamc@765 75 "bool"]
adamc@765 76 val clientToServer = ref clientToServerBase
adamc@765 77 fun setClientToServer ls = clientToServer := S.addList (clientToServerBase, ls)
adamc@765 78 fun mayClientToServer x = S.member (!clientToServer, x)
adamc@765 79
adamc@765 80 val effectfulBase = basis ["set_cookie",
adamc@765 81 "new_client_source",
adamc@765 82 "get_client_source",
adamc@765 83 "set_client_source",
adamc@765 84 "alert",
adamc@765 85 "new_channel",
adamc@765 86 "send",
adamc@765 87 "onError",
adamc@765 88 "onFail",
adamc@765 89 "onConnectFail",
adamc@765 90 "onDisconnect",
adamc@765 91 "onServerError"]
adamc@765 92
adamc@765 93 val effectful = ref effectfulBase
adamc@765 94 fun setEffectful ls = effectful := S.addList (effectfulBase, ls)
adamc@765 95 fun isEffectful x = S.member (!effectful, x)
adamc@765 96
adamc@765 97 val clientBase = basis ["get",
adamc@765 98 "set",
adamc@765 99 "alert",
adamc@765 100 "recv",
adamc@765 101 "sleep",
adamc@765 102 "spawn",
adamc@765 103 "onError",
adamc@765 104 "onFail",
adamc@765 105 "onConnectFail",
adamc@765 106 "onDisconnect",
adamc@765 107 "onServerError"]
adamc@765 108 val client = ref clientBase
adamc@765 109 fun setClientOnly ls = client := S.addList (clientBase, ls)
adamc@765 110 fun isClientOnly x = S.member (!client, x)
adamc@765 111
adamc@765 112 val serverBase = basis ["requestHeader",
adamc@765 113 "query",
adamc@765 114 "dml",
adamc@765 115 "nextval",
adamc@765 116 "channel",
adamc@765 117 "send"]
adamc@765 118 val server = ref serverBase
adamc@765 119 fun setServerOnly ls = server := S.addList (serverBase, ls)
adamc@765 120 fun isServerOnly x = S.member (!server, x)
adamc@765 121
adamc@765 122 val basisM = foldl (fn ((k, v : string), m) => M.insert (m, ("Basis", k), v)) M.empty
adamc@765 123
adamc@765 124 val jsFuncsBase = basisM [("alert", "alert"),
adamc@765 125 ("get_client_source", "sg"),
adamc@765 126 ("htmlifyBool", "bs"),
adamc@765 127 ("htmlifyFloat", "ts"),
adamc@765 128 ("htmlifyInt", "ts"),
adamc@765 129 ("htmlifyString", "eh"),
adamc@765 130 ("new_client_source", "sc"),
adamc@765 131 ("set_client_source", "sv"),
adamc@765 132 ("stringToFloat_error", "pfl"),
adamc@765 133 ("stringToInt_error", "pi"),
adamc@765 134 ("urlifyInt", "ts"),
adamc@765 135 ("urlifyFloat", "ts"),
adamc@765 136 ("urlifyString", "uf"),
adamc@765 137 ("recv", "rv"),
adamc@765 138 ("strcat", "cat"),
adamc@765 139 ("intToString", "ts"),
adamc@765 140 ("floatToString", "ts"),
adamc@765 141 ("onError", "onError"),
adamc@765 142 ("onFail", "onFail"),
adamc@765 143 ("onConnectFail", "onConnectFail"),
adamc@765 144 ("onDisconnect", "onDisconnect"),
adamc@765 145 ("onServerError", "onServerError")]
adamc@765 146 val jsFuncs = ref jsFuncsBase
adamc@765 147 fun setJsFuncs ls = jsFuncs := foldl (fn ((k, v), m) => M.insert (m, k, v)) jsFuncsBase ls
adamc@765 148 fun jsFunc x = M.find (!jsFuncs, x)
adamc@765 149
adamc@768 150 datatype pattern_kind = Exact | Prefix
adamc@768 151 datatype action = Allow | Deny
adamc@768 152 type rule = { action : action, kind : pattern_kind, pattern : string }
adamc@768 153
adamc@768 154 datatype path_kind = Any | Url | Table | Sequence | View | Relation | Cookie | Style
adamc@768 155 type rewrite = { pkind : path_kind, kind : pattern_kind, from : string, to : string }
adamc@768 156
adamc@768 157 val rewrites = ref ([] : rewrite list)
adamc@768 158
adamc@768 159 fun subsume (pk1, pk2) =
adamc@768 160 pk1 = pk2
adamc@768 161 orelse pk2 = Any
adamc@768 162 orelse pk2 = Relation andalso (pk1 = Table orelse pk1 = Sequence orelse pk1 = View)
adamc@768 163
adamc@768 164 fun setRewriteRules ls = rewrites := ls
adamc@768 165 fun rewrite pk s =
adamc@768 166 let
adamc@768 167 fun rew (ls : rewrite list) =
adamc@768 168 case ls of
adamc@768 169 [] => s
adamc@768 170 | rewr :: ls =>
adamc@768 171 let
adamc@768 172 fun match () =
adamc@768 173 case #kind rewr of
adamc@768 174 Exact => if #from rewr = s then
adamc@768 175 SOME (size s)
adamc@768 176 else
adamc@768 177 NONE
adamc@768 178 | Prefix => if String.isPrefix (#from rewr) s then
adamc@768 179 SOME (size (#from rewr))
adamc@768 180 else
adamc@768 181 NONE
adamc@768 182 in
adamc@768 183 if subsume (pk, #pkind rewr) then
adamc@768 184 case match () of
adamc@768 185 NONE => rew ls
adamc@768 186 | SOME suffixStart => #to rewr ^ String.extract (s, suffixStart, NONE)
adamc@768 187 else
adamc@768 188 rew ls
adamc@768 189 end
adamc@768 190 in
adamc@768 191 rew (!rewrites)
adamc@768 192 end
adamc@768 193
adamc@769 194 val url = ref ([] : rule list)
adamc@769 195 val mime = ref ([] : rule list)
adamc@769 196
adamc@769 197 fun setUrlRules ls = url := ls
adamc@769 198 fun setMimeRules ls = mime := ls
adamc@769 199
adamc@770 200 fun getUrlRules () = !url
adamc@770 201 fun getMimeRules () = !mime
adamc@770 202
adamc@769 203 fun check f rules s =
adamc@769 204 let
adamc@769 205 fun chk (ls : rule list) =
adamc@769 206 case ls of
adamc@769 207 [] => false
adamc@769 208 | rule :: ls =>
adamc@769 209 let
adamc@769 210 val matches =
adamc@769 211 case #kind rule of
adamc@769 212 Exact => #pattern rule = s
adamc@769 213 | Prefix => String.isPrefix (#pattern rule) s
adamc@769 214 in
adamc@769 215 if matches then
adamc@769 216 case #action rule of
adamc@769 217 Allow => true
adamc@769 218 | Deny => false
adamc@769 219 else
adamc@769 220 chk ls
adamc@769 221 end
adamc@769 222 in
adamc@769 223 f s andalso chk (!rules)
adamc@769 224 end
adamc@769 225
adamc@769 226 val checkUrl = check (fn _ => true) url
adamc@769 227 val checkMime = check
adamc@769 228 (CharVector.all (fn ch => Char.isAlphaNum ch orelse ch = #"/" orelse ch = #"-" orelse ch = #"."))
adamc@769 229 mime
adamc@769 230
adamc@765 231 end