/*

    File:           main.m

    Description:    This file parses the cgi query string, processes the request (using the 

                    connection to the daemon), and returns a response.

*/

#import <Foundation/Foundation.h>

#import "BroadcasterAdminRequest.h"

    // prototypes

NSDictionary    *buildQueryDictionary(NSString *theQueryString);

NSString        *decodeURLString(NSString *theString);

int main(int argc, const char *argv[])

{

    NSAutoreleasePool       *pool = [[NSAutoreleasePool alloc] init];

    NSString                *queryString;

    BroadcasterAdminRequest *broadcastAdminRequest;

    NSDictionary            *queryDictionary = nil;

    // init

    broadcastAdminRequest = [[[BroadcasterAdminRequest alloc] init] autorelease];

    // get the query string

    queryString = [[[NSProcessInfo processInfo] environment] objectForKey:@"QUERY_STRING"];

    // build the query dictionary

    if (queryString)

        queryDictionary = buildQueryDictionary(queryString);

    // run the runloop

    [[NSRunLoop currentRunLoop] run];

    // process the request

    [broadcastAdminRequest processRequest:queryDictionary];

    // release

    [pool release];

    return 0;

}

NSDictionary *buildQueryDictionary(NSString *theQueryString)

{

    NSMutableDictionary *theQueryDictionary;

    NSScanner           *theScanner;

    NSCharacterSet      *theCGIParamSet;

    NSString            *theName;

    NSString            *theValue;

    BOOL                gotChars;

    // init

    theQueryDictionary = [NSMutableDictionary dictionaryWithCapacity:5];

    theCGIParamSet = [NSCharacterSet characterSetWithCharactersInString:@"=&"];

    theScanner = [NSScanner scannerWithString:theQueryString];

    // build the dictionary

    while (![theScanner isAtEnd])

    {

        // init

        gotChars = NO;

        // read the attribute name first

        [theScanner scanUpToCharactersFromSet:theCGIParamSet intoString:&theName];

        // next get the attribute value (if it exists)

        if ([theQueryString characterAtIndex:[theScanner scanLocation]] == '=')

        {

            [theScanner scanString:@"=" intoString:nil];

            gotChars = [theScanner scanUpToCharactersFromSet:theCGIParamSet intoString:&theValue];

        }

        // save the attribute name/value pair

        if (gotChars)

            [theQueryDictionary setObject:decodeURLString(theValue) forKey:theName];

        else

            [theQueryDictionary setObject:[NSString string] forKey:theName];

        // next attribute

        [theScanner scanString:@"&" intoString:nil];

    }

    return theQueryDictionary;

}

NSString *decodeURLString(NSString *theString)

{

    NSMutableString *theDecodedString;

    NSScanner       *theScanner;

    NSString        *tempString;

    NSCharacterSet  *theEscapedSet;

    char            theChar, theHighChar, theLowChar;

    // init

    theDecodedString = [NSMutableString stringWithCapacity:25];

    theEscapedSet = [NSCharacterSet characterSetWithCharactersInString:@"+%"];

    theScanner = [NSScanner scannerWithString:theString];

    // decode

    while ([theScanner isAtEnd] == NO)

    {

        // scan up to trouble

        tempString = nil;

        [theScanner scanUpToCharactersFromSet:theEscapedSet intoString:&tempString];

        if (tempString)

            [theDecodedString appendString:tempString];

        // next get the encoded character (if it exists)

        if ([theScanner isAtEnd] == NO)

        {

            if ([theString characterAtIndex:[theScanner scanLocation]] == '+')

            {

                [theScanner scanString:@"+" intoString:nil];

                [theDecodedString appendString:@" "];

            }

            else if ([theString characterAtIndex:[theScanner scanLocation]] == '%')

            {

                // get the byte

                [theScanner scanString:@"%" intoString:nil];

                theHighChar = [theString characterAtIndex:([theScanner scanLocation])];

                theLowChar = [theString characterAtIndex:([theScanner scanLocation] + 1)];

                // convert to a char

                if (theHighChar >= '0' && theHighChar <= '9')

                    theChar = (theHighChar - '0') << 4;

                else if (theHighChar >= 'a' && theHighChar <= 'f')

                    theChar = (theHighChar - 'a' + 10) << 4;

                else if (theHighChar >= 'A' && theHighChar <= 'F')

                    theChar = (theHighChar - 'A' + 10) << 4;

                if (theLowChar >= '0' && theLowChar <= '9')

                    theChar |= theLowChar - '0';

                else if (theLowChar >= 'a' && theLowChar <= 'f')

                    theChar |= theLowChar - 'a' + 10;

                else if (theLowChar >= 'A' && theLowChar <= 'F')

                    theChar |= theLowChar - 'A' + 10;

                // update

                [theScanner setScanLocation:([theScanner scanLocation] + 2)];

                [theDecodedString appendString:[NSString stringWithCString:&theChar length:1]];

            }

        }

    }

    return theDecodedString;

}