Copyright 1999-2003 John D. Polstra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by John D. Polstra.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
MODULE Auth;
IMPORT ErrMsg, FileRd, Fmt, OSError, Pathname, Rd, Text, Thread, TokScan;
REVEAL
DB = BRANDED OBJECT
path: Pathname.T;
rd: Rd.T;
lineNum := 0;
END;
PROCEDURE Close(db: DB)
RAISES {Error, Thread.Alerted} =
BEGIN
TRY
Rd.Close(db.rd);
EXCEPT Rd.Failure(l) =>
RAISE Error("Cannot close \"" & db.path & "\": " & ErrMsg.StrError(l));
END;
END Close;
PROCEDURE Err(db: DB; msg: TEXT)
RAISES {Error} =
BEGIN
RAISE Error(db.path & ":" & Fmt.Int(db.lineNum) & ": " & msg);
END Err;
PROCEDURE GetRec(db: DB): TokScan.T
RAISES {Error, Rd.EndOfFile, Thread.Alerted} =
VAR
line: TEXT;
BEGIN
TRY
REPEAT
INC(db.lineNum);
line := TokScan.Trim(Rd.GetLine(db.rd));
UNTIL Text.Length(line) > 0 AND Text.GetChar(line, 0) # '#';
EXCEPT Rd.Failure(l) =>
Err(db, "read error: " & ErrMsg.StrError(l));
END;
RETURN TokScan.New(line, SET OF CHAR{':'}, emptyTokens := TRUE);
END GetRec;
PROCEDURE Lookup(db: DB;
server: TEXT;
VAR (*OUT*) auth: T): BOOLEAN
RAISES {Error, Thread.Alerted} =
VAR
startingPoint: CARDINAL;
ts: TokScan.T;
found: BOOLEAN;
ent: T;
BEGIN
TRY
startingPoint := Rd.Index(db.rd);
REPEAT
TRY
ts := GetRec(db);
ent.server := ts.getToken("server name");
ent.client := ts.getToken("client name");
ent.password := ts.getToken("password");
ent.comment := ts.getToken("comment");
found := TokScan.EqualFolded(ent.server, server);
EXCEPT Rd.EndOfFile =>
Rd.Seek(db.rd, 0);
db.lineNum := 0;
END;
UNTIL found OR Rd.Index(db.rd) = startingPoint;
IF NOT found THEN RETURN FALSE END;
auth := ent;
EXCEPT
| Rd.Failure(l) =>
RAISE Error("Cannot rewind \"" & db.path & "\": " &
ErrMsg.StrError(l));
| TokScan.Error(msg) =>
Err(db, msg);
END;
RETURN TRUE;
END Lookup;
PROCEDURE Open(path: Pathname.T): DB
RAISES {Error} =
BEGIN
TRY
RETURN NEW(DB, path := path, rd := FileRd.Open(path));
EXCEPT OSError.E(l) =>
RAISE Error("Cannot open \"" & path & "\": " & ErrMsg.StrError(l));
END;
END Open;
BEGIN
END Auth.