rules

type Action interface {
	// Init initializes the action.
	Init(RuleMetadata, string) error

	// Evaluate evaluates the action.
	Evaluate(RuleMetadata, TransactionState)

	// Type returns the type of action.
	Type() ActionType
}

type ActionType int

type Operator interface {
	// Evaluate is used during the rule evaluation,
	// it returns true if the operator succeeded against
	// the input data for the transaction
	Evaluate(TransactionState, string) bool
}

type OperatorFactory func(options OperatorOptions) (Operator, error)

type OperatorOptions struct {
	// Arguments is used to store the operator args
	Arguments string

	// Path is used to store a list of possible data paths
	Path []string

	// Root is the root to resolve Path from.
	Root fs.FS

	// Datasets contains input datasets or dictionaries
	Datasets map[string][]string
}

type Rule interface {
	// Evaluate evaluates the rule, returning data related to matches if any.
	Evaluate(state TransactionState) []types.MatchData
}

type RuleMetadata interface {
	// GetID returns the ID of the rule.
	ID() int

	// GetParentID returns the ID of the parent of the rule for a chained rule.
	ParentID() int

	// Status returns the status to set if the rule matches.
	Status() int
}

type TransactionState interface {
	// ID returns the ID of the transaction.
	ID() string // TODO(anuraaga): If only for logging, can be built into logger

	// Variables returns the TransactionVariables of the transaction.
	Variables() TransactionVariables

	// Collection returns a collection from the transaction.
	Collection(idx variables.RuleVariable) collection.Collection

	// Interrupt interrupts the transaction.
	Interrupt(interruption *types.Interruption)

	// ResponseBodyWriter allows writing to the response body.
	// TODO(anuraaga): Should this be combined with interruption? Any action writing anything to response can be dangerous.
	ResponseBodyWriter() io.Writer

	// ContentInjection returns whether content injection is enabled for this transaction.
	ContentInjection() bool // TODO(anuraaga): Should be resolved at Init time when WAF is truly immutable.
	// DebugLogger returns the logger for this transaction.
	DebugLogger() loggers.DebugLogger

	// Capturing returns whether the transaction is capturing. CaptureField only works if capturing, this can be used
	// as an optimization to avoid processing specific to capturing fields.
	Capturing() bool // TODO(anuraaga): Only needed in operators?
	// CaptureField captures a field.
	CaptureField(idx int, value string)
}

type TransactionVariables interface {
	// Simple Variables
	UserID() *collection.Simple
	UrlencodedError() *collection.Simple
	ResponseContentType() *collection.Simple
	UniqueID() *collection.Simple
	ArgsCombinedSize() *collection.SizeProxy
	AuthType() *collection.Simple
	FilesCombinedSize() *collection.Simple
	FullRequest() *collection.Simple
	FullRequestLength() *collection.Simple
	InboundDataError() *collection.Simple
	MatchedVar() *collection.Simple
	MatchedVarName() *collection.Simple
	MultipartBoundaryQuoted() *collection.Simple
	MultipartBoundaryWhitespace() *collection.Simple
	MultipartCrlfLfLines() *collection.Simple
	MultipartDataAfter() *collection.Simple
	MultipartDataBefore() *collection.Simple
	MultipartFileLimitExceeded() *collection.Simple
	MultipartPartHeaders() *collection.Map
	MultipartHeaderFolding() *collection.Simple
	MultipartInvalidHeaderFolding() *collection.Simple
	MultipartInvalidPart() *collection.Simple
	MultipartInvalidQuoting() *collection.Simple
	MultipartLfLine() *collection.Simple
	MultipartMissingSemicolon() *collection.Simple
	MultipartStrictError() *collection.Simple
	MultipartUnmatchedBoundary() *collection.Simple
	OutboundDataError() *collection.Simple
	PathInfo() *collection.Simple
	QueryString() *collection.Simple
	RemoteAddr() *collection.Simple
	RemoteHost() *collection.Simple
	RemotePort() *collection.Simple
	RequestBodyError() *collection.Simple
	RequestBodyErrorMsg() *collection.Simple
	RequestBodyProcessorError() *collection.Simple
	RequestBodyProcessorErrorMsg() *collection.Simple
	RequestBodyProcessor() *collection.Simple
	RequestBasename() *collection.Simple
	RequestBody() *collection.Simple
	RequestBodyLength() *collection.Simple
	RequestFilename() *collection.Simple
	RequestLine() *collection.Simple
	RequestMethod() *collection.Simple
	RequestProtocol() *collection.Simple
	RequestURI() *collection.Simple
	RequestURIRaw() *collection.Simple
	ResponseBody() *collection.Simple
	ResponseContentLength() *collection.Simple
	ResponseProtocol() *collection.Simple
	ResponseStatus() *collection.Simple
	ServerAddr() *collection.Simple
	ServerName() *collection.Simple
	ServerPort() *collection.Simple
	SessionID() *collection.Simple
	HighestSeverity() *collection.Simple
	StatusLine() *collection.Simple
	InboundErrorData() *collection.Simple
	// Custom
	Env() *collection.Map
	TX() *collection.Map
	Rule() *collection.Map
	Duration() *collection.Simple
	// Proxy Variables
	Args() *collection.Proxy
	// Maps Variables
	ArgsGet() *collection.Map
	ArgsPost() *collection.Map
	ArgsPath() *collection.Map
	FilesTmpNames() *collection.Map
	Geo() *collection.Map
	Files() *collection.Map
	RequestCookies() *collection.Map
	RequestHeaders() *collection.Map
	ResponseHeaders() *collection.Map
	MultipartName() *collection.Map
	MatchedVarsNames() *collection.Map
	MultipartFilename() *collection.Map
	MatchedVars() *collection.Map
	FilesSizes() *collection.Map
	FilesNames() *collection.Map
	FilesTmpContent() *collection.Map
	ResponseHeadersNames() *collection.Map
	RequestHeadersNames() *collection.Map
	RequestCookiesNames() *collection.Map
	XML() *collection.Map
	RequestXML() *collection.Map
	ResponseXML() *collection.Map
	// Persistent variables
	IP() *collection.Map
	// Translation Proxy Variables
	ArgsNames() *collection.TranslationProxy
	ArgsGetNames() *collection.TranslationProxy
	ArgsPostNames() *collection.TranslationProxy
}

type Transformation = func(input string) (string, error)