OOLegacyScriptWhitelist.m File Reference

import "OOCocoa.h"
import "OOLegacyScriptWhitelist.h"
import "OOStringParsing.h"
import "ResourceManager.h"
import "OOCollectionExtractors.h"
import "PlayerEntityLegacyScriptEngine.h"
import "NSDictionaryOOExtensions.h"
import "OODeepCopy.h"

Include dependency graph for OOLegacyScriptWhitelist.m:

Go to the source code of this file.

Classes
struct	SanStackElement

Macros
#define	INCLUDE_RAW_STRING   OOLITE_DEBUG

Typedefs
typedef struct SanStackElement	SanStackElement

Functions
static NSArray *	OOSanitizeLegacyScriptInternal (NSArray *script, SanStackElement *stack, BOOL allowAIMethods)
static NSArray *	OOSanitizeLegacyScriptConditionsInternal (NSArray *conditions, SanStackElement *stack)
static NSArray *	SanitizeCondition (NSString *condition, SanStackElement *stack)
static NSArray *	SanitizeConditionalStatement (NSDictionary *statement, SanStackElement *stack, BOOL allowAIMethods)
static NSArray *	SanitizeActionStatement (NSString *statement, SanStackElement *stack, BOOL allowAIMethods)
static OOOperationType	ClassifyLHSConditionSelector (NSString *selectorString, NSString **outSanitizedMethod, SanStackElement *stack)
static NSString *	SanitizeQueryMethod (NSString *selectorString)
static NSString *	SanitizeActionMethod (NSString *selectorString, BOOL allowAIMethods)
static NSArray *	AlwaysFalseConditions (void)
static BOOL	IsAlwaysFalseConditions (NSArray *conditions)
static NSString *	StringFromStack (SanStackElement *topOfStack)
NSArray *	OOSanitizeLegacyScript (NSArray *script, NSString *context, BOOL allowAIMethods)
NSArray *	OOSanitizeLegacyScriptConditions (NSArray *conditions, NSString *context)
BOOL	OOLegacyConditionsAreSanitized (NSArray *conditions)
static NSMutableString *	StringFromStackInternal (SanStackElement *topOfStack)

Macro Definition Documentation

INCLUDE_RAW_STRING

#define INCLUDE_RAW_STRING   OOLITE_DEBUG

Definition at line 36 of file OOLegacyScriptWhitelist.m.

Typedef Documentation

SanStackElement

typedef struct SanStackElement SanStackElement

Definition at line 39 of file OOLegacyScriptWhitelist.m.

Function Documentation

AlwaysFalseConditions()

static NSArray * AlwaysFalseConditions ( void )

static

Definition at line 515 of file OOLegacyScriptWhitelist.m.

{
    static NSArray *alwaysFalse = nil;
    if (alwaysFalse != nil)
    {
        alwaysFalse = [NSArray arrayWithObject:[NSArray arrayWithObject:[NSNumber numberWithUnsignedInt:OP_FALSE]]];
        [alwaysFalse retain];
    }
    
    return alwaysFalse;
}

References nil.

Referenced by OOSanitizeLegacyScriptConditionsInternal().

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ClassifyLHSConditionSelector()

static OOOperationType ClassifyLHSConditionSelector ( NSString * selectorString, NSString ** outSanitizedMethod, SanStackElement * stack )

static

Definition at line 417 of file OOLegacyScriptWhitelist.m.

{
    assert(outSanitizedSelector != NULL);
    
    *outSanitizedSelector = selectorString;
    
    // Allow arbitrary mission_foo or local_foo pseudo-selectors.
    if ([selectorString hasPrefix:@"mission_"])  return OP_MISSION_VAR;
    if ([selectorString hasPrefix:@"local_"])  return OP_LOCAL_VAR;
    
    // If it's a real method, check against whitelist.
    *outSanitizedSelector = SanitizeQueryMethod(selectorString);
    if (*outSanitizedSelector == nil)
    {
        return OP_INVALID;
    }
    
    // If it's a real method, and in the whitelist, classify by suffix.
    if ([selectorString hasSuffix:@"_string"])  return OP_STRING;
    if ([selectorString hasSuffix:@"_number"])  return OP_NUMBER;
    if ([selectorString hasSuffix:@"_bool"])  return OP_BOOL;
    
    // If we got here, something's wrong.
    OOLog(@"script.sanitize.unclassifiedSelector", @"***** ERROR: Whitelisted query method \"%@\" has no type suffix, treating as invalid.", selectorString);
    return OP_INVALID;
}

References nil, OOLog, OP_BOOL, OP_INVALID, OP_LOCAL_VAR, OP_MISSION_VAR, OP_NUMBER, OP_STRING, and SanitizeQueryMethod().

Referenced by SanitizeCondition().

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IsAlwaysFalseConditions()

static BOOL IsAlwaysFalseConditions ( NSArray * conditions )

static

Definition at line 528 of file OOLegacyScriptWhitelist.m.

{
    return [[conditions oo_arrayAtIndex:0] oo_unsignedIntAtIndex:0] == OP_FALSE;
}

References OP_FALSE.

Referenced by SanitizeConditionalStatement().

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OOLegacyConditionsAreSanitized()

BOOL OOLegacyConditionsAreSanitized

(

NSArray *

conditions

)

Definition at line 170 of file OOLegacyScriptWhitelist.m.

{
    if ([conditions count] == 0)  return YES;   // Empty array is safe.
    return [[conditions objectAtIndex:0] isKindOfClass:[NSArray class]];
}

References count.

Referenced by OOSanitizeLegacyScriptConditionsInternal().

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OOSanitizeLegacyScript()

NSArray * OOSanitizeLegacyScript	(	NSArray *	script,
		NSString *	context,
		BOOL	allowAIMethods )

Definition at line 63 of file OOLegacyScriptWhitelist.m.

{
    SanStackElement stackRoot = { NULL, context, 0 };
    NSArray *result = OOSanitizeLegacyScriptInternal(script, &stackRoot, allowAIMethods);
    return [OODeepCopy(result) autorelease];
}

References OOSanitizeLegacyScriptInternal().

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OOSanitizeLegacyScriptConditions()

NSArray * OOSanitizeLegacyScriptConditions	(	NSArray *	conditions,
		NSString *	context )

Definition at line 117 of file OOLegacyScriptWhitelist.m.

{
    if (context == nil)  context = @"<anonymous conditions>";
    SanStackElement stackRoot = { NULL, context, 0 };
    NSArray *result = OOSanitizeLegacyScriptConditionsInternal(conditions, &stackRoot);
    return [OODeepCopy(result) autorelease];
}

References nil, and OOSanitizeLegacyScriptConditionsInternal().

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OOSanitizeLegacyScriptConditionsInternal()

static NSArray * OOSanitizeLegacyScriptConditionsInternal ( NSArray * conditions, SanStackElement * stack )

static

Definition at line 126 of file OOLegacyScriptWhitelist.m.

{
    NSEnumerator                *conditionEnum = nil;
    NSString                    *condition = nil;
    NSMutableArray              *result = nil;
    NSArray                     *tokens = nil;
    BOOL                        OK = YES;
    NSUInteger                  index = 0;
    
    if (OOLegacyConditionsAreSanitized(conditions) || conditions == nil)  return conditions;
    
    result = [NSMutableArray arrayWithCapacity:[conditions count]];
    
    for (conditionEnum = [conditions objectEnumerator]; (condition = [conditionEnum nextObject]); )
    {
        SanStackElement subStack =
        {
            stack, nil, index++
        };
        
        if (![condition isKindOfClass:[NSString class]])
        {
            OOLog(@"script.syntax.condition.notString", @"***** SCRIPT ERROR: in %@, bad condition - expected string, got %@; ignoring.", StringFromStack(stack), [condition class]);
            OK = NO;
            break;
        }
        
        tokens = SanitizeCondition(condition, &subStack);
        if (tokens != nil)
        {
            [result addObject:tokens];
        }
        else
        {
            OK = NO;
            break;
        }
    }
    
    if (OK)  return result;
    else  return AlwaysFalseConditions();
}

References AlwaysFalseConditions(), SanStackElement::index, nil, OOLegacyConditionsAreSanitized(), OOLog, SanitizeCondition(), and StringFromStack().

Referenced by OOSanitizeLegacyScriptConditions(), and SanitizeConditionalStatement().

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OOSanitizeLegacyScriptInternal()

static NSArray * OOSanitizeLegacyScriptInternal ( NSArray * script, SanStackElement * stack, BOOL allowAIMethods )

static

Definition at line 71 of file OOLegacyScriptWhitelist.m.

{
    NSAutoreleasePool           *pool = nil;
    NSMutableArray              *result = nil;
    NSEnumerator                *statementEnum = nil;
    id                          statement = nil;
    NSUInteger                  index = 0;
    
    pool = [[NSAutoreleasePool alloc] init];
    
    result = [NSMutableArray arrayWithCapacity:[script count]];
    
    for (statementEnum = [script objectEnumerator]; (statement = [statementEnum nextObject]); )
    {
        SanStackElement subStack =
        {
            stack, nil, index++
        };
        
        if ([statement isKindOfClass:[NSDictionary class]])
        {
            statement = SanitizeConditionalStatement(statement, &subStack, allowAIMethods);
        }
        else if ([statement isKindOfClass:[NSString class]])
        {
            statement = SanitizeActionStatement(statement, &subStack, allowAIMethods);
        }
        else
        {
            OOLog(@"script.syntax.statement.invalidType", @"***** SCRIPT ERROR: in %@, statement is of invalid type - expected string or dictionary, got %@.", StringFromStack(stack), [statement class]);
            statement = nil;
        }
        
        if (statement != nil)
        {
            [result addObject:statement];
        }
    }
    
    [result retain];
    [pool release];
    
    return [result autorelease];
}

References SanStackElement::index, nil, OOLog, SanitizeActionStatement(), SanitizeConditionalStatement(), and StringFromStack().

Referenced by OOSanitizeLegacyScript(), and SanitizeConditionalStatement().

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SanitizeActionMethod()

static NSString * SanitizeActionMethod ( NSString * selectorString, BOOL allowAIMethods )

static

Definition at line 466 of file OOLegacyScriptWhitelist.m.

{
    static NSSet                *whitelist = nil;
    static NSSet                *whitelistWithAI = nil;
    static NSDictionary         *aliases = nil;
    static NSDictionary         *aliasesWithAI = nil;
    NSString                    *aliasedSelector = nil;
    
    if (whitelist == nil)
    {
        NSArray                     *actionMethods = nil;
        NSArray                     *aiMethods = nil;
        NSArray                     *aiAndActionMethods = nil;
        
        actionMethods = [[ResourceManager whitelistDictionary] oo_arrayForKey:@"action_methods"];
        aiMethods = [[ResourceManager whitelistDictionary] oo_arrayForKey:@"ai_methods"];
        aiAndActionMethods = [[ResourceManager whitelistDictionary] oo_arrayForKey:@"ai_and_action_methods"];
        
        if (actionMethods == nil)  actionMethods = [NSArray array];
        if (aiMethods == nil)  aiMethods = [NSArray array];
        
        if (aiAndActionMethods != nil)  actionMethods = [actionMethods arrayByAddingObjectsFromArray:aiAndActionMethods];
        
        whitelist = [[NSSet alloc] initWithArray:actionMethods];
        whitelistWithAI = [[NSSet alloc] initWithArray:[aiMethods arrayByAddingObjectsFromArray:actionMethods]];
        
        aliases = [[[ResourceManager whitelistDictionary] oo_dictionaryForKey:@"action_method_aliases"] retain];
        
        aliasesWithAI = [[ResourceManager whitelistDictionary] oo_dictionaryForKey:@"ai_method_aliases"];
        if (aliasesWithAI != nil)
        {
            aliasesWithAI = [[aliasesWithAI dictionaryByAddingEntriesFromDictionary:aliases] copy];
        }
        else
        {
            aliasesWithAI = [aliases copy];
        }
    }
    
    aliasedSelector = [(allowAIMethods ? aliasesWithAI : aliases) oo_stringForKey:selectorString];
    if (aliasedSelector != nil)  selectorString = aliasedSelector;
    
    if (![(allowAIMethods ? whitelistWithAI : whitelist) containsObject:selectorString])  selectorString = nil;
    
    return selectorString;
}

References nil, and ResourceManager::whitelistDictionary.

Referenced by SanitizeActionStatement().

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SanitizeActionStatement()

static NSArray * SanitizeActionStatement ( NSString * statement, SanStackElement * stack, BOOL allowAIMethods )

static

Definition at line 372 of file OOLegacyScriptWhitelist.m.

{
    NSMutableArray              *tokens = nil;
    NSUInteger                  tokenCount;
    NSString                    *rawSelectorString = nil;
    NSString                    *selectorString = nil;
    NSString                    *argument = nil;
    
    tokens = ScanTokensFromString(statement);
    tokenCount = [tokens count];
    if (tokenCount == 0)  return nil;
    
    rawSelectorString = [tokens objectAtIndex:0];
    selectorString = SanitizeActionMethod(rawSelectorString, allowAIMethods);
    if (selectorString == nil)
    {
        OOLog(@"script.unpermittedMethod", @"***** SCRIPT ERROR: in %@ (\"%@\"), method \"%@\" not allowed.", StringFromStack(stack), statement, rawSelectorString);
        return nil;
    }
    
    if ([selectorString isEqualToString:@"doNothing"])
    {
        return nil;
    }
    
    if ([selectorString hasSuffix:@":"])
    {
        // Expects an argument
        if (tokenCount == 2)
        {
            argument = [tokens objectAtIndex:1];
        }
        else
        {
            [tokens removeObjectAtIndex:0];
            argument = [tokens componentsJoinedByString:@" "];
        }
        
        argument = [argument stringByReplacingOccurrencesOfString:@"[credits_number]" withString:@"[_oo_legacy_credits_number]"];
    }
    
    return [NSArray arrayWithObjects:[NSNumber numberWithBool:NO], selectorString, argument, nil];
}

References nil, OOLog, SanitizeActionMethod(), ScanTokensFromString(), and StringFromStack().

Referenced by OOSanitizeLegacyScriptInternal().

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SanitizeCondition()

static NSArray * SanitizeCondition ( NSString * condition, SanStackElement * stack )

static

Definition at line 177 of file OOLegacyScriptWhitelist.m.

{
    NSArray                     *tokens = nil;
    NSUInteger                  i, tokenCount;
    OOOperationType             opType;
    NSString                    *selectorString = nil;
    NSString                    *sanitizedSelectorString = nil;
    NSString                    *comparatorString = nil;
    OOComparisonType            comparatorValue;
    NSMutableArray              *rhs = nil;
    NSString                    *rhsItem = nil;
    NSString                    *rhsSelector = nil;
    NSArray                     *sanitizedRHSItem = nil;
    NSString                    *stringSegment = nil;
    
    tokens = ScanTokensFromString(condition);
    tokenCount = [tokens count];
    
    if (tokenCount < 1)
    {
        OOLog(@"script.debug.syntax.scriptCondition.noneSpecified", @"***** SCRIPT ERROR: in %@, empty script condition.", StringFromStack(stack));
        return nil;
    }
    
    // Parse left-hand side.
    selectorString = [tokens oo_stringAtIndex:0];
    opType = ClassifyLHSConditionSelector(selectorString, &sanitizedSelectorString, stack);
    if (opType >= OP_INVALID)
    {
        OOLog(@"script.unpermittedMethod", @"***** SCRIPT ERROR: in %@ (\"%@\"), method \"%@\" not allowed.", StringFromStack(stack), condition, selectorString);
        return nil;
    }
    
    // Parse operator.
    if (tokenCount > 1)
    {
        comparatorString = [tokens oo_stringAtIndex:1];
        if ([comparatorString isEqualToString:@"equal"])  comparatorValue = COMPARISON_EQUAL;
        else if ([comparatorString isEqualToString:@"notequal"])  comparatorValue = COMPARISON_NOTEQUAL;
        else if ([comparatorString isEqualToString:@"lessthan"])  comparatorValue = COMPARISON_LESSTHAN;
        else if ([comparatorString isEqualToString:@"greaterthan"])  comparatorValue = COMPARISON_GREATERTHAN;
        else if ([comparatorString isEqualToString:@"morethan"])  comparatorValue = COMPARISON_GREATERTHAN;
        else if ([comparatorString isEqualToString:@"oneof"])  comparatorValue = COMPARISON_ONEOF;
        else if ([comparatorString isEqualToString:@"undefined"])  comparatorValue = COMPARISON_UNDEFINED;
        else
        {
            OOLog(@"script.debug.syntax.badComparison", @"***** SCRIPT ERROR: in %@ (\"%@\"), unknown comparison operator \"%@\", will return NO.", StringFromStack(stack), condition, comparatorString);
            return nil;
        }
    }
    else
    {
        /*  In the direct interpreter, having no operator resulted in an
            implicit COMPARISON_NO operator, which always evaluated to false.
            Returning NO here causes AlwaysFalseConditions() to be used, which
            has the same effect.
         */
        OOLog(@"script.debug.syntax.noOperator", @"----- WARNING: SCRIPT in %@ -- No operator in expression \"%@\", will always evaluate as false.", StringFromStack(stack), condition);
        return nil;
    }
    
    // Check for invalid opType/comparator combinations.
    if (opType == OP_NUMBER && comparatorValue == COMPARISON_UNDEFINED)
    {
        OOLog(@"script.debug.syntax.invalidOperator", @"***** SCRIPT ERROR: in %@ (\"%@\"), comparison operator \"%@\" is not valid for %@.", StringFromStack(stack), condition, @"undefined", @"numbers");
        return nil;
    }
    else if (opType == OP_BOOL)
    {
        switch (comparatorValue)
        {
            // Valid comparators
            case COMPARISON_EQUAL:
            case COMPARISON_NOTEQUAL:
                break;
            
            default:
                OOLog(@"script.debug.syntax.invalidOperator", @"***** SCRIPT ERROR: in %@ (\"%@\"), comparison operator \"%@\" is not valid for %@.", StringFromStack(stack), condition, OOComparisonTypeToString(comparatorValue), @"booleans");
                return nil;
                
        }
    }
    
    /*  Parse right-hand side. Each token is converted to an array of the
        token and a boolean indicating whether it's a selector.
        
        This also coalesces non-selector tokens, i.e. whitespace-separated
        string segments.
    */
    if (tokenCount > 2)
    {
        rhs = [NSMutableArray arrayWithCapacity:tokenCount - 2];
        for (i = 2; i < tokenCount; i++)
        {
            rhsItem = [tokens oo_stringAtIndex:i];
            rhsSelector = SanitizeQueryMethod(rhsItem);
            if (rhsSelector != nil)
            {
                // Method
                if (stringSegment != nil)
                {
                    // Add stringSegment as a literal token.
                    sanitizedRHSItem = [NSArray arrayWithObjects:[NSNumber numberWithBool:NO], stringSegment, nil];
                    [rhs addObject:sanitizedRHSItem];
                    stringSegment = nil;
                }
                
                sanitizedRHSItem = [NSArray arrayWithObjects:[NSNumber numberWithBool:YES], rhsSelector, nil];
                [rhs addObject:sanitizedRHSItem];
            }
            else
            {
                // String; append to stringSegment
                if (stringSegment == nil)  stringSegment = rhsItem;
                else  stringSegment = [NSString stringWithFormat:@"%@ %@", stringSegment, rhsItem];
            }
        }
        
        if (stringSegment != nil)
        {
            sanitizedRHSItem = [NSArray arrayWithObjects:[NSNumber numberWithBool:NO], stringSegment, nil];
            [rhs addObject:sanitizedRHSItem];
        }
    }
    else
    {
        rhs = [NSMutableArray array];
    }
    
    NSString *rawString = nil;
#if INCLUDE_RAW_STRING
    rawString = condition;
#else
    rawString = @"<condition>";
#endif
    
    return [NSArray arrayWithObjects:
            [NSNumber numberWithUnsignedInt:opType],
            rawString,
            sanitizedSelectorString,
            [NSNumber numberWithUnsignedInt:comparatorValue],
            rhs,
            nil];
}

References ClassifyLHSConditionSelector(), COMPARISON_EQUAL, COMPARISON_GREATERTHAN, COMPARISON_LESSTHAN, COMPARISON_NOTEQUAL, COMPARISON_ONEOF, COMPARISON_UNDEFINED, nil, OOComparisonTypeToString(), OOLog, OP_BOOL, OP_INVALID, OP_NUMBER, SanitizeQueryMethod(), ScanTokensFromString(), and StringFromStack().

Referenced by OOSanitizeLegacyScriptConditionsInternal().

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SanitizeConditionalStatement()

static NSArray * SanitizeConditionalStatement ( NSDictionary * statement, SanStackElement * stack, BOOL allowAIMethods )

static

Definition at line 323 of file OOLegacyScriptWhitelist.m.

{
    NSArray                 *conditions = nil;
    NSArray                 *doActions = nil;
    NSArray                 *elseActions = nil;
    
    conditions = [statement oo_arrayForKey:@"conditions"];
    if (conditions == nil)
    {
        OOLog(@"script.syntax.noConditions", @"***** SCRIPT ERROR: in %@, conditions array contains no \"conditions\" entry, ignoring.", StringFromStack(stack));
        return nil;
    }
    
    // Sanitize conditions.
    SanStackElement subStack = { stack, @"conditions", 0 };
    conditions = OOSanitizeLegacyScriptConditionsInternal(conditions, &subStack);
    if (conditions == nil)
    {
        return nil;
    }
    
    // Sanitize do and else.
    if (!IsAlwaysFalseConditions(conditions))  doActions = [statement oo_arrayForKey:@"do"];
    if (doActions != nil)
    {
        subStack.key = @"do";
        doActions = OOSanitizeLegacyScriptInternal(doActions, &subStack, allowAIMethods);
    }
    
    elseActions = [statement oo_arrayForKey:@"else"];
    if (elseActions != nil)
    {
        subStack.key = @"else";
        elseActions = OOSanitizeLegacyScriptInternal(elseActions, &subStack, allowAIMethods);
    }
    
    // If neither does anything, the statment has no effect.
    if ([doActions count] == 0 && [elseActions count] == 0)
    {
        return nil;
    }
    
    if (doActions == nil)  doActions = [NSArray array];
    if (elseActions == nil)  elseActions = [NSArray array];
    
    return [NSArray arrayWithObjects:[NSNumber numberWithBool:YES], conditions, doActions, elseActions, nil];
}

References count, IsAlwaysFalseConditions(), SanStackElement::key, nil, OOLog, OOSanitizeLegacyScriptConditionsInternal(), OOSanitizeLegacyScriptInternal(), and StringFromStack().

Referenced by OOSanitizeLegacyScriptInternal().

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SanitizeQueryMethod()

static NSString * SanitizeQueryMethod ( NSString * selectorString )

static

Definition at line 445 of file OOLegacyScriptWhitelist.m.

{
    static NSSet                *whitelist = nil;
    static NSDictionary         *aliases = nil;
    NSString                    *aliasedSelector = nil;
    
    if (whitelist == nil)
    {
        whitelist = [[NSSet alloc] initWithArray:[[ResourceManager whitelistDictionary] oo_arrayForKey:@"query_methods"]];
        aliases = [[[ResourceManager whitelistDictionary] oo_dictionaryForKey:@"query_method_aliases"] retain];
    }
    
    aliasedSelector = [aliases oo_stringForKey:selectorString];
    if (aliasedSelector != nil)  selectorString = aliasedSelector;
    
    if (![whitelist containsObject:selectorString])  selectorString = nil;
    
    return selectorString;
}

References nil, and ResourceManager::whitelistDictionary.

Referenced by ClassifyLHSConditionSelector(), and SanitizeCondition().

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StringFromStack()

static NSString * StringFromStack ( SanStackElement * topOfStack )

static

Definition at line 551 of file OOLegacyScriptWhitelist.m.

{
    return StringFromStackInternal(topOfStack);
}

References StringFromStackInternal().

Referenced by OOSanitizeLegacyScriptConditionsInternal(), OOSanitizeLegacyScriptInternal(), SanitizeActionStatement(), SanitizeCondition(), and SanitizeConditionalStatement().

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StringFromStackInternal()

static NSMutableString * StringFromStackInternal ( SanStackElement * topOfStack )

static

Definition at line 534 of file OOLegacyScriptWhitelist.m.

{
    if (topOfStack == NULL)  return nil;
    
    NSMutableString *base = StringFromStackInternal(topOfStack->back);
    if (base == nil)  base = [NSMutableString string];
    
    NSString *string = topOfStack->key;
    if (string == nil)  string = [NSString stringWithFormat:@"%lu", (unsigned long)topOfStack->index];
    if ([base length] > 0)  [base appendString:@"."];
    
    [base appendString:string];
    
    return base;
}

References SanStackElement::back, SanStackElement::key, nil, and StringFromStackInternal().

Referenced by StringFromStack(), and StringFromStackInternal().

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