| 1 | (* |
| 2 | * Dynamic web page generation with Standard ML |
| 3 | * Copyright (C) 2003 Adam Chlipala |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2.1 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | *) |
| 19 | |
| 20 | (* CGI interaction *) |
| 21 | |
| 22 | structure Web :> WEB = |
| 23 | struct |
| 24 | fun for f (r1, r2) = |
| 25 | if r1 < r2 then |
| 26 | let |
| 27 | fun loop i = |
| 28 | if i > r2 then |
| 29 | () |
| 30 | else |
| 31 | (f i; |
| 32 | loop (i+1)) |
| 33 | in |
| 34 | loop r1 |
| 35 | end |
| 36 | else |
| 37 | let |
| 38 | fun loop i = |
| 39 | if i < r2 then |
| 40 | () |
| 41 | else |
| 42 | (f i; |
| 43 | loop (i-1)) |
| 44 | in |
| 45 | loop r1 |
| 46 | end |
| 47 | |
| 48 | val params : string list StringMap.map ref = ref StringMap.empty |
| 49 | |
| 50 | val paramStack : string list StringMap.map list ref = ref [] |
| 51 | |
| 52 | fun setParam (n, v) = params := StringMap.insert (!params, n, v) |
| 53 | fun setSingleParam (n, v) = setParam (n, [v]) |
| 54 | |
| 55 | fun getParam v = |
| 56 | (case StringMap.find (!params, v) of |
| 57 | NONE => "" |
| 58 | | SOME [] => "" |
| 59 | | SOME (s::_) => s) |
| 60 | |
| 61 | fun getMultiParam v = |
| 62 | (case StringMap.find (!params, v) of |
| 63 | NONE => [] |
| 64 | | SOME l => l) |
| 65 | |
| 66 | fun pushParams nvs = |
| 67 | (paramStack := (!params) :: (!paramStack); |
| 68 | app setParam nvs) |
| 69 | |
| 70 | fun popParams () = |
| 71 | (case !paramStack of |
| 72 | [] => raise Fail "Empty params stack in popParams" |
| 73 | | h::t => (params := h; |
| 74 | paramStack := t)) |
| 75 | |
| 76 | fun withParams f nvs = |
| 77 | (pushParams nvs; |
| 78 | ((f ()) handle ex => (popParams (); raise ex)) |
| 79 | before popParams ()) |
| 80 | |
| 81 | val headers = ref (StringMap.empty : string list StringMap.map) |
| 82 | fun setHeader (n, v) = headers := StringMap.insert (!headers, n, v) |
| 83 | fun getHeader n = StringMap.find (!headers, n) |
| 84 | fun addHeader (n, v) = |
| 85 | headers := StringMap.insert (!headers, n, case getHeader n of |
| 86 | NONE => [v] |
| 87 | | SOME vs => vs @ [v]) |
| 88 | fun getSingleHeader n = |
| 89 | (case StringMap.find (!headers, n) of |
| 90 | SOME (v::_) => SOME v |
| 91 | | _ => NONE) |
| 92 | |
| 93 | val text = ref ([] : string list) |
| 94 | |
| 95 | fun print x = text := x :: (!text) |
| 96 | fun clear () = text := [] |
| 97 | fun noOutput () = !text = [] |
| 98 | fun output () = |
| 99 | (TextIO.print "Status: 200\n"; |
| 100 | StringMap.appi (fn (n, vs) => |
| 101 | app (fn v => (TextIO.print n; |
| 102 | TextIO.print ": "; |
| 103 | TextIO.print v; |
| 104 | TextIO.print "\n")) |
| 105 | vs) (!headers); |
| 106 | TextIO.print "\n"; |
| 107 | TextIO.print (String.concat (List.rev (!text)))) |
| 108 | |
| 109 | val getCgi = OS.Process.getEnv |
| 110 | |
| 111 | val explode = CharVector.foldr (op::) [] |
| 112 | |
| 113 | fun html s = |
| 114 | let |
| 115 | fun xch #"<" = "<" |
| 116 | | xch #">" = ">" |
| 117 | | xch #"&" = "&" |
| 118 | | xch #"\"" = """ |
| 119 | | xch ch = str ch |
| 120 | in |
| 121 | String.concat (map xch (explode s)) |
| 122 | end |
| 123 | |
| 124 | fun htmlNl s = |
| 125 | let |
| 126 | fun xch #"<" = "<" |
| 127 | | xch #">" = ">" |
| 128 | | xch #"&" = "&" |
| 129 | | xch #"\"" = """ |
| 130 | | xch #"\n" = "<br />" |
| 131 | | xch ch = str ch |
| 132 | in |
| 133 | String.concat (map xch (explode s)) |
| 134 | end |
| 135 | |
| 136 | fun pad (n, ch) s = |
| 137 | if size s < n then |
| 138 | pad (n, ch) (ch ^ s) |
| 139 | else |
| 140 | s |
| 141 | |
| 142 | fun urlEncode s = |
| 143 | let |
| 144 | fun xch ch = |
| 145 | if Char.isAlphaNum ch orelse ch = #"." then |
| 146 | str ch |
| 147 | else if ch = #" " then |
| 148 | "+" |
| 149 | else |
| 150 | "%" ^ pad (2, "0") (Int.fmt StringCvt.HEX (ord ch)) |
| 151 | in |
| 152 | String.concat (map xch (explode s)) |
| 153 | end |
| 154 | |
| 155 | exception Format of string |
| 156 | |
| 157 | fun stoiOpt s = Int.fromString s |
| 158 | fun stoi s = |
| 159 | (case Int.fromString s of |
| 160 | NONE => raise Format s |
| 161 | | SOME i => i) |
| 162 | |
| 163 | fun storOpt s = Real.fromString s |
| 164 | fun stor s = |
| 165 | (case Real.fromString s of |
| 166 | NONE => raise Format s |
| 167 | | SOME r => r) |
| 168 | |
| 169 | fun summary () = |
| 170 | StringMap.foldli (fn (n, vs, s) => foldl (fn (v, s) => s ^ " VALUE: " ^ v) (s ^ " NAME: " ^ n) vs) |
| 171 | "" (!params) |
| 172 | |
| 173 | val exn = ref (NONE : exn option) |
| 174 | fun setExn ex = exn := SOME ex |
| 175 | fun getExn () = valOf (!exn) |
| 176 | |
| 177 | type cookie = {name : string, value : string, expires : Date.date option, |
| 178 | domain : string option, path : string option, secure : bool} |
| 179 | |
| 180 | fun setCookie {name, value, expires, domain, path, secure} = |
| 181 | let |
| 182 | val s = name ^ "=" ^ value |
| 183 | val s = |
| 184 | case expires of |
| 185 | NONE => s |
| 186 | | SOME date => s ^ "; expires=" ^ Date.fmt "%a, %d-%b-%Y %H:%M:%S GMT" date |
| 187 | val s = |
| 188 | case domain of |
| 189 | NONE => s |
| 190 | | SOME dom => s ^ "; domain=" ^ dom |
| 191 | val s = |
| 192 | case path of |
| 193 | NONE => s |
| 194 | | SOME path => s ^ "; path=" ^ path |
| 195 | val s = |
| 196 | if secure then |
| 197 | s ^ "; secure" |
| 198 | else |
| 199 | s |
| 200 | in |
| 201 | addHeader ("Set-Cookie", s) |
| 202 | end |
| 203 | |
| 204 | fun getCookie n = |
| 205 | (case getCgi "HTTP_COOKIE" of |
| 206 | NONE => NONE |
| 207 | | SOME cookies => |
| 208 | let |
| 209 | fun search (n'::v::rest) = |
| 210 | if n = n' then |
| 211 | SOME v |
| 212 | else |
| 213 | search rest |
| 214 | | search _ = NONE |
| 215 | in |
| 216 | search (String.tokens (fn ch => ch = #"=" orelse ch = #";" orelse ch = #" ") cookies) |
| 217 | end) |
| 218 | |
| 219 | fun remoteHost () = |
| 220 | case getCgi "REMOTE_HOST" of |
| 221 | NONE => getCgi "REMOTE_ADDR" |
| 222 | | h => h |
| 223 | |
| 224 | fun plusSeconds (t, s) = Time.+ (t, Time.fromSeconds (LargeInt.fromInt s)) |
| 225 | fun minusSeconds (t, s) = Time.- (t, Time.fromSeconds (LargeInt.fromInt s)) |
| 226 | |
| 227 | fun split (s, ch) = |
| 228 | let |
| 229 | val len = size s |
| 230 | |
| 231 | fun find i = |
| 232 | if i >= len then |
| 233 | NONE |
| 234 | else if String.sub (s, i) = ch then |
| 235 | SOME (String.substring (s, 0, i), String.extract (s, i+1, NONE)) |
| 236 | else |
| 237 | find (i+1) |
| 238 | in |
| 239 | find 0 |
| 240 | end |
| 241 | |
| 242 | fun replaceUrlVar (url, n, v) = |
| 243 | case split (url, #"?") of |
| 244 | NONE => url |
| 245 | | SOME (uri, qs) => |
| 246 | let |
| 247 | fun doPair (nv, (L, yn)) = |
| 248 | (case split (nv, #"=") of |
| 249 | NONE => (nv::L, yn) |
| 250 | | SOME (n', v') => |
| 251 | if n = n' then |
| 252 | ((n ^ "=" ^ v)::L, true) |
| 253 | else |
| 254 | (nv::L, yn)) |
| 255 | val (pairs, yn) = foldr doPair ([], false) (String.tokens (fn ch => ch = #"&") qs) |
| 256 | val pairs = |
| 257 | if yn then |
| 258 | pairs |
| 259 | else |
| 260 | (n ^ "=" ^ v) :: pairs |
| 261 | in |
| 262 | case pairs of |
| 263 | [] => url |
| 264 | | nv::rest => |
| 265 | String.concat (uri :: "?" :: nv :: foldr (fn (nv, L) => "&"::nv::L) [] rest) |
| 266 | end |
| 267 | end |