core

type EdgeRuntime interface {
	// Execute starts VCL request lifecycle.
	Execute(context.Context) error

	// CreateBackendRequest is hook point of making bereq from req
	// This hook will be called before calling vcl_pass or vcl_miss
	// Must return raw headers of BackendRequest
	CreateBackendRequest() vintage.RawHeader

	// CreateBackendRequest is hook point of making resp from beresp
	// This hook will be called before calling vcl_deliver
	// Must return raw headers of ClientResponse
	CreateClientResponse() (vintage.RawHeader, error)

	// CreateObjectResponse is hool poing of construct object response.
	// This hook will be called before calling vcl_error.
	// VCL may call without request proxying like "error 400" statement,
	// then object (backend response) is nil, so runtime have to construct from empty.
	// First argument is status code that is set via error [statusCode]
	// Second argument is response body that is set via error [statusCode] [response]
	CreateObjectResponse(int, string) (vintage.RawHeader, error)

	// Proxy is hook point for actual senging origin request.
	// This hook will be called before calling vcl_fetch
	// Must return raw headers of BackendResponse
	Proxy(ctx context.Context, backendName string) (vintage.RawHeader, error)

	// WriteResponse is hook point for sending client response.
	// This hook will be called before calling vcl_log
	// the response is exact 3 length of in64 slice:
	// 0. written header bytes
	// 1. written body bytes
	// 2. written response bytes (include status line)
	WriteResponse() ([3]int64, error)
}

type Header struct {
	MH textproto.MIMEHeader
}

type Resource[T EdgeRuntime] func(c *Runtime[T])

type Runtime[T EdgeRuntime] struct {
	Backend               *vintage.Backend
	RequestHeader         *Header
	BackendRequestHeader  *Header
	BackendResponseHeader *Header
	ResponseHeader        *Header
	RequestStartTime      time.Time
	RequestEndTime        time.Time
	Restarts              int
	RequestHash           string
	RequestHeaderBytes    int64

	ClientIp       net.IP
	ClientIdentity string

	// We should implement User-Agent related matcher by ourselves
	UserAgent *UserAgent
	// Temporal WAF related variables
	Waf *Waf

	// Declaration stacks
	Backends         map[string]*vintage.Backend
	Acls             map[string]*vintage.Acl
	Tables           map[string]*vintage.Table
	Subroutines      map[string]Subroutine[T]
	LoggingEndpoints map[string]*vintage.LoggingEndpoint

	// Properties that will be assigned in the process
	OriginalHost                        string
	MaxStaleIfError                     time.Duration
	MaxStaleWhileRevalidate             time.Duration
	ClientSocketCongestionAlgorithm     string
	ClientSocketCWND                    int64
	ClientSocketPace                    int64
	EsiAllowInsideData                  bool
	EnableESI                           bool
	ESILevel                            int64
	IsLocallyGenerated                  bool
	TimeToFirstByte                     time.Duration
	BackendResponseBrotli               bool
	BackendResponseCachable             bool
	BackendResponseDoESI                bool
	BackendResponseDoStream             bool
	BackendResponseGrace                bool
	BackendResponseGzip                 bool
	BackendResponseHipaa                bool
	BackendResponsePCI                  bool
	BackendResponseStaleIfError         time.Duration
	BackendResponseStaleWhileRevalidate time.Duration
	BackendResponseTTL                  time.Duration
	ObjectStaleIfError                  time.Duration
	ObjectStaleWhileRevalidate          time.Duration
	ObjectTTL                           time.Duration
	ObjectStatus                        int64
	ObjectResponse                      string
	EnableRangeOnPass                   bool
	EnableSegmentedCaching              bool
	HashAlwaysMiss                      bool
	HashIgnoreBusy                      bool
	ResponseBytesWritten                int64
	ResponseBodyBytesWritten            int64
	ResponseHeaderBytesWritten          int64
	GeoIpOverride                       string
	GeoIpUseXForwardedFor               bool
	SegmentedCachingBlockSize           int64
	SaintMode                           bool
	ResponseStale                       bool
	ResponseStaleIsError                bool
	ResponseStaleIsRevalidating         bool
	ResponseCompleted                   bool

	// Following fields are set via builtin function
	FastlyError               string
	DisableCompressionHeaders []string
	PushResources             []string
	H3AltSvc                  bool
}

type SameSite int

type Subroutine[T EdgeRuntime] func(ctx T) (vintage.State, error)

type UserAgent struct {
	// contains filtered or unexported fields
}

type Waf struct {
	AnomalyScore         int64
	Blocked              bool
	Counter              int64
	Executed             bool
	Failures             int64
	HttpViolationScore   int64
	InboundAnomalyScore  int64
	LFIScore             int64
	Logdata              string
	Logged               bool
	Message              string
	Passed               bool
	PHPInjectionScore    int64
	RCEScore             int64
	RFIScore             int64
	RuleId               int64
	SessionFixationScore int64
	SQLInjectionScore    int64
	Severity             int64
	XSSScore             int64
}