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A silly RPC bug that I'm surprised wasn't caught before now
author Adam Chlipala <adam@chlipala.net>
date Sun, 17 Apr 2011 13:15:10 -0400
parents fcd3a977d77b
children 1be573ac8e2b c0731afcb0c7
rev   line source
adam@26 1 style provider
adam@26 2
adam@26 3 style aol
adam@26 4 style google
adam@26 5 style myspace
adam@26 6 style yahoo
adam@26 7
adam@28 8 datatype choose_result a = Success of a | Failure of string
adam@28 9
adam@16 10 functor Make(M: sig
adam@16 11 con cols :: {Type}
adam@16 12 constraint [Id] ~ cols
adam@17 13 val folder : folder cols
adam@17 14 val inj : $(map sql_injectable cols)
adam@17 15
adam@17 16 type creationState
adam@17 17 type creationData
adam@17 18 val creationState : transaction creationState
adam@17 19 val render : creationState -> xtable
adam@20 20 val ready : creationState -> signal bool
adam@17 21 val tabulate : creationState -> signal creationData
adam@28 22 val choose : sql_table ([Id = string] ++ cols) [Pkey = [Id]] -> creationData -> transaction (choose_result $cols)
adam@16 23
adam@16 24 val sessionLifetime : int
adam@16 25 val afterLogout : url
adam@16 26 val secureCookies : bool
adam@16 27 val association : Openid.association_mode
adam@16 28 val realm : option string
adam@17 29 val formClass : css_class
adam@23 30 val fakeId : option string
adam@16 31 end) = struct
adam@16 32
adam@16 33 type user = string
adam@28 34 val eq_user = _
adam@28 35 val read_user = _
adam@16 36 val show_user = _
adam@16 37 val inj_user = _
adam@16 38
adam@16 39 table user : ([Id = user] ++ M.cols)
adam@16 40 PRIMARY KEY Id
adam@16 41
adam@16 42 table identity : {User : user, Identifier : string}
adam@16 43 PRIMARY KEY (User, Identifier)
adam@16 44
adam@16 45 sequence sessionIds
adam@16 46
adam@16 47 table session : {Id : int, Key : int, Identifier : option string, Expires : time}
adam@16 48 PRIMARY KEY Id
adam@16 49
adam@22 50 datatype authMode =
adam@22 51 SigningUp of {Session : int, Key : int}
adam@22 52 | LoggedIn of {User : user, Session : int, Key : int}
adam@22 53
adam@22 54 cookie auth : authMode
adam@16 55
adam@17 56 val currentUrl =
adam@17 57 b <- currentUrlHasPost;
adam@17 58 if b then
adam@17 59 return M.afterLogout
adam@17 60 else
adam@17 61 currentUrl
adam@17 62
adam@16 63 val current =
adam@22 64 login <- getCookie auth;
adam@16 65 case login of
adam@22 66 Some (LoggedIn login) =>
adam@22 67 (ident <- oneOrNoRowsE1 (SELECT (session.Identifier)
adam@22 68 FROM session
adam@22 69 WHERE session.Id = {[login.Session]}
adam@22 70 AND session.Key = {[login.Key]});
adam@22 71 case ident of
adam@22 72 None => return None
adam@22 73 | Some None => return None
adam@22 74 | Some (Some ident) =>
adam@22 75 valid <- oneRowE1 (SELECT COUNT( * ) > 0
adam@22 76 FROM identity
adam@22 77 WHERE identity.User = {[login.User]}
adam@22 78 AND identity.Identifier = {[ident]});
adam@22 79 if valid then
adam@22 80 return (Some login.User)
adam@22 81 else
adam@22 82 error <xml>Session not authorized to act as user</xml>)
adam@22 83 | _ => return None
adam@16 84
adam@17 85 fun validUser s = String.length s > 0 && String.length s < 20
adam@17 86 && String.all Char.isAlnum s
adam@17 87
adam@16 88 fun main wrap =
adam@16 89 let
adam@16 90 fun logout () =
adam@22 91 clearCookie auth;
adam@16 92 redirect M.afterLogout
adam@16 93
adam@17 94 fun signupDetails after =
adam@17 95 let
adam@17 96 fun finishSignup uid data =
adam@17 97 if not (validUser uid) then
adam@17 98 return (Some "That username is not valid. It must be between 1 and 19 characters long, containing only letters and numbers.")
adam@17 99 else
adam@17 100 used <- oneRowE1 (SELECT COUNT( * ) > 0
adam@17 101 FROM user
adam@17 102 WHERE user.Id = {[uid]});
adam@17 103 if used then
adam@17 104 return (Some "That username is taken. Please choose another.")
adam@17 105 else
adam@22 106 ses <- getCookie auth;
adam@17 107 case ses of
adam@17 108 None => return (Some "Missing session cookie")
adam@22 109 | Some (LoggedIn _) => return (Some "Session cookie is for already logged-in user")
adam@22 110 | Some (SigningUp ses) =>
adam@17 111 ident <- oneOrNoRowsE1 (SELECT (session.Identifier)
adam@17 112 FROM session
adam@17 113 WHERE session.Id = {[ses.Session]}
adam@17 114 AND session.Key = {[ses.Key]});
adam@17 115 case ident of
adam@17 116 None => return (Some "Invalid session data")
adam@17 117 | Some None => return (Some "Session has no associated identifier")
adam@17 118 | Some (Some ident) =>
adam@28 119 cols <- M.choose user data;
adam@28 120 case cols of
adam@28 121 Failure s => return (Some s)
adam@28 122 | Success cols =>
adam@28 123 setCookie auth {Value = LoggedIn ({User = uid} ++ ses),
adam@28 124 Expires = None,
adam@28 125 Secure = M.secureCookies};
adam@17 126
adam@28 127 dml (insert user ({Id = (SQL {[uid]})} ++ @Sql.sqexps M.folder M.inj cols));
adam@28 128 dml (INSERT INTO identity (User, Identifier)
adam@28 129 VALUES ({[uid]}, {[ident]}));
adam@30 130 return None
adam@17 131 in
adam@17 132 uid <- source "";
adam@17 133 cs <- M.creationState;
adam@17 134
adam@17 135 wrap "Your User Details" <xml>
adam@17 136 <table class={M.formClass}>
adam@17 137 <tr> <th class={M.formClass}>Username:</th> <td><ctextbox source={uid}/></td> </tr>
adam@17 138 {M.render cs}
adam@20 139 <tr> <td><dyn signal={b <- M.ready cs;
adam@20 140 return (if b then
adam@20 141 <xml><button value="Create Account"
adam@20 142 onclick={uid <- get uid;
adam@20 143 data <- Basis.current (M.tabulate cs);
adam@20 144 res <- rpc (finishSignup uid data);
adam@20 145 case res of
adam@20 146 None => redirect (bless after)
adam@20 147 | Some msg => alert msg}/></xml>
adam@20 148 else
adam@20 149 <xml/>)}/></td> </tr>
adam@17 150 </table>
adam@17 151 </xml>
adam@17 152 end
adam@17 153
adam@16 154 fun opCallback after ses res =
adam@16 155 case res of
adam@16 156 Openid.Canceled => error <xml>You canceled the login process.</xml>
adam@16 157 | Openid.Failure s => error <xml>Login failed: {[s]}</xml>
adam@16 158 | Openid.AuthenticatedAs ident =>
adam@22 159 av <- getCookie auth;
adam@22 160 case av of
adam@22 161 Some (SigningUp signup) =>
adam@16 162 if signup.Session <> ses then
adam@16 163 error <xml>Session has changed suspiciously</xml>
adam@16 164 else
adam@16 165 invalid <- oneRowE1 (SELECT COUNT( * ) = 0
adam@16 166 FROM session
adam@16 167 WHERE session.Id = {[signup.Session]}
adam@16 168 AND session.Key = {[signup.Key]});
adam@16 169 if invalid then
adam@16 170 error <xml>Invalid or expired session</xml>
adam@16 171 else
adam@17 172 dml (UPDATE session
adam@17 173 SET Identifier = {[Some ident]}
adam@17 174 WHERE Id = {[signup.Session]});
adam@17 175 signupDetails after
adam@22 176 | Some (LoggedIn login) =>
adam@22 177 if login.Session <> ses then
adam@22 178 error <xml>Session has changed suspiciously</xml>
adam@22 179 else
adam@22 180 invalid <- oneRowE1 (SELECT COUNT( * ) = 0
adam@22 181 FROM session
adam@22 182 WHERE session.Id = {[login.Session]}
adam@22 183 AND session.Key = {[login.Key]});
adam@22 184 if invalid then
adam@22 185 error <xml>Invalid or expired session</xml>
adam@16 186 else
adam@22 187 dml (UPDATE session
adam@22 188 SET Identifier = {[Some ident]}
adam@22 189 WHERE Id = {[login.Session]});
adam@22 190 redirect (bless after)
adam@22 191 | None => error <xml>Missing session cookie</xml>
adam@16 192
adam@23 193 fun fakeCallback ident after ses =
adam@23 194 av <- getCookie auth;
adam@23 195 case av of
adam@23 196 Some (SigningUp signup) =>
adam@23 197 invalid <- oneRowE1 (SELECT COUNT( * ) = 0
adam@23 198 FROM session
adam@23 199 WHERE session.Id = {[signup.Session]}
adam@23 200 AND session.Key = {[signup.Key]});
adam@23 201 if invalid then
adam@23 202 error <xml>Invalid or expired session</xml>
adam@23 203 else
adam@23 204 dml (UPDATE session
adam@23 205 SET Identifier = {[Some ident]}
adam@23 206 WHERE Id = {[signup.Session]});
adam@23 207 signupDetails after
adam@23 208 | Some (LoggedIn login) =>
adam@23 209 invalid <- oneRowE1 (SELECT COUNT( * ) = 0
adam@23 210 FROM session
adam@23 211 WHERE session.Id = {[login.Session]}
adam@23 212 AND session.Key = {[login.Key]});
adam@23 213 if invalid then
adam@23 214 error <xml>Invalid or expired session</xml>
adam@23 215 else
adam@23 216 dml (UPDATE session
adam@23 217 SET Identifier = {[Some ident]}
adam@23 218 WHERE Id = {[login.Session]});
adam@23 219 redirect (bless after)
adam@23 220 | None => error <xml>Missing session cookie</xml>
adam@23 221
adam@16 222 fun newSession () =
adam@16 223 ses <- nextval sessionIds;
adam@16 224 now <- now;
adam@16 225 key <- rand;
adam@16 226 dml (INSERT INTO session (Id, Key, Identifier, Expires)
adam@16 227 VALUES ({[ses]}, {[key]}, NULL, {[addSeconds now M.sessionLifetime]}));
adam@16 228 return {Session = ses, Key = key}
adam@16 229
adam@17 230 fun logon after r =
adam@16 231 ident <- oneOrNoRowsE1 (SELECT (identity.Identifier)
adam@16 232 FROM identity
adam@16 233 WHERE identity.User = {[r.User]}
adam@16 234 LIMIT 1);
adam@16 235 case ident of
adam@16 236 None => error <xml>Username not found</xml>
adam@16 237 | Some ident =>
adam@16 238 ses <- newSession ();
adam@22 239 setCookie auth {Value = LoggedIn (r ++ ses),
adam@22 240 Expires = None,
adam@22 241 Secure = M.secureCookies};
adam@16 242 ses <- return ses.Session;
adam@23 243 if M.fakeId = Some ident then
adam@23 244 fakeCallback ident after ses
adam@23 245 else
adam@23 246 msg <- Openid.authenticate (opCallback after ses)
adam@23 247 {Association = M.association,
adam@23 248 Realm = M.realm,
adam@23 249 Identifier = ident};
adam@23 250 error <xml>Login with your identity provider failed: {[msg]}</xml>
adam@16 251
adam@16 252 fun doSignup after r =
adam@16 253 ses <- newSession ();
adam@22 254 setCookie auth {Value = SigningUp ses,
adam@22 255 Expires = None,
adam@22 256 Secure = M.secureCookies};
adam@16 257 ses <- return ses.Session;
adam@23 258 if M.fakeId = Some r.Identifier then
adam@23 259 fakeCallback r.Identifier after ses
adam@23 260 else
adam@23 261 msg <- Openid.authenticate (opCallback after ses)
adam@23 262 {Association = M.association,
adam@23 263 Realm = M.realm,
adam@23 264 Identifier = r.Identifier};
adam@23 265 error <xml>Login with your identity provider failed: {[msg]}</xml>
adam@16 266
adam@22 267 fun signup after =
adam@26 268 let
adam@27 269 fun fixed cls url =
adam@26 270 let
adam@26 271 fun doFixedButton () =
adam@26 272 doSignup after {Identifier = url}
adam@26 273 in
adam@26 274 <xml><form class={provider}>
adam@27 275 <submit class={cls} value="" action={doFixedButton}/>
adam@26 276 </form></xml>
adam@26 277 end
adam@26 278 in
adam@26 279 wrap "Account Signup" <xml>
adam@26 280 <p>This web site uses the <b><a href="http://openid.net/">OpenID</a></b> standard, which lets you log in using your account from one of several popular web sites, without revealing your password to us.</p>
adam@26 281
adam@26 282 <p>You may click one of these buttons to choose to use your account from that site:</p>
adam@27 283 {fixed aol "https://openid.aol.com/"}
adam@27 284 {fixed google "https://www.google.com/accounts/o8/id"}
adam@27 285 {fixed myspace "https://www.myspace.com/openid"}
adam@27 286 {fixed yahoo "https://me.yahoo.com/"}
adam@26 287
adam@26 288 <p>Visitors familiar with the details of OpenID may also enter their own identifiers:</p>
adam@26 289 <form>
adam@26 290 OpenID Identifier: <textbox{#Identifier}/><br/>
adam@26 291 <submit value="Sign Up" action={doSignup after}/>
adam@26 292 </form>
adam@26 293 </xml>
adam@26 294 end
adam@16 295 in
adam@16 296 cur <- current;
adam@17 297 here <- currentUrl;
adam@16 298 case cur of
adam@25 299 Some cur => return {Status = <xml>Logged in as {[cur]}.</xml>,
adam@25 300 Other = <xml><a link={logout ()}>Log out</a></xml>}
adam@25 301 | None => return {Status = <xml><form><textbox{#User}/> <submit value="Log In" action={logon (show here)}/></form></xml>,
adam@25 302 Other = <xml><a link={signup (show here)}>Sign up</a></xml>}
adam@16 303 end
adam@16 304
adam@16 305 task periodic 60 = fn () => dml (DELETE FROM session
adam@21 306 WHERE Expires < CURRENT_TIMESTAMP)
adam@16 307
adam@16 308 end