0001    //
0002    //  BasicAuth.swift
0003    //  HttpBasicAuth
0004    //
0005    //  This source file is part of the HttpBasicAuth open source project
0006    //
0007    //  Created by John Becker on 1/13/16.
0008    //  Copyright © 2016 Beckersoft. All rights reserved.
0009    //  Licensed under MIT License
0010    //
0011    //  See LICENSE.txt for license information.
0012    //
0013    
0014    /**
0015    A library for parsing Basic HTTP Authentication credentials from a header
0016    dictionary.
0017    */
0018    public class BasicAuth {
0019        
0020        /**
0021         Regular Expression for basic auth credentials
0022         
0023         credentials = auth-scheme 1*SP token68
0024         auth-scheme = "Basic" ; case insensitive
0025         token68     = 1*( ALPHA / DIGIT / "-" / "." / "_" / "~" / "+" / "/" ) *"="
0026         */
0027        internal static let credentialsRegEx
BasicAuth.swift:51
            encodedAuth = header.regexMatches(credentialsRegEx).last, =
0028            "^ *(?:[Bb][Aa][Ss][Ii][Cc]) +([A-Za-z0-9\\-\\._~\\+\\/]+=*) *$"
0029        
0030        /**
0031         Regular Expression for basic auth user/pass
0032         
0033         user-pass   = userid ":" password
0034         userid      = *<TEXT excluding ":">
0035         password    = *TEXT
0036         */
0037        internal static let userPassRegEx
BasicAuth.swift:55
            let userPass = decodedAuth.regexMatches(userPassRegEx) = "^([^:]*):(.*)$"
0038        
0039        /**
0040         Parse the Authorization header field of a request.
0041         
0042         - Parameter headers:   A dictionary of HTTP headers.
0043    
0044         - Returns: Credentials with the username and password or nil if none exist.
0045         */
0046        public class func getCredentials(headers:[String:String]) -> Credentials? {
0047            
0048            // get header
0049            if let header = headers["Authorization"],
0050                // regex match the base64 encoded basic authorization
0051                encodedAuth = header.regexMatches(credentialsRegEx).last,
0052                // base64 decode the auth string
0053                decodedAuth = encodedAuth.base64Decode() {
0054                // regex match the username and password
0055                let userPass = decodedAuth.regexMatches(userPassRegEx)
0056                // ensure we have enough matches
0057                if userPass.count ==  {
0058                    // return the Credentials with the username and password
0059                    return Credentials(username:userPass[], password:userPass[])
0060                }
0061            }
0062            
0063            // no credentials were found
0064            return nil
0065        }
0066        
0067    }
0068    
0069