middleware

type AJAXConfig struct {
	Skipper   echo.Skipper
	Handler   echo.HandlerFuncs
	ParamName string
	OnlyAJAX  bool
}

type BasicValidateFunc func(string, string) bool

type BodyLimitConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper `json:"-"`

	// Maximum allowed size for a request body, it can be specified
	// as `4x` or `4xB`, where x is one of the multiple from K, M, G, T or P.
	Limit string `json:"limit"`
	// contains filtered or unexported fields
}

type CORSConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper

	// AllowOrigin defines a list of origins that may access the resource.
	// Optional with default value as []string{"*"}.
	AllowOrigins []string

	// AllowMethods defines a list methods allowed when accessing the resource.
	// This is used in response to a preflight request.
	// Optional with default value as `DefaultCORSConfig.AllowMethods`.
	AllowMethods []string

	// AllowHeaders defines a list of request headers that can be used when
	// making the actual request. This in response to a preflight request.
	// Optional with default value as []string{}.
	AllowHeaders []string

	// AllowCredentials indicates whether or not the response to the request
	// can be exposed when the credentials flag is true. When used as part of
	// a response to a preflight request, this indicates whether or not the
	// actual request can be made using credentials.
	// Optional with default value as false.
	AllowCredentials bool

	// ExposeHeaders defines a whitelist headers that clients are allowed to
	// access.
	// Optional with default value as []string{}.
	ExposeHeaders []string

	// MaxAge indicates how long (in seconds) the results of a preflight request
	// can be cached.
	// Optional with default value as 0.
	MaxAge int
}

type CSRFConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper `json:"-"`

	// TokenLength is the length of the generated token.
	TokenLength uint8 `json:"token_length"`

	// TokenLookup is a string in the form of "<source>:<key>" that is used
	// to extract token from the request.
	// Optional. Default value "header:X-CSRF-Token".
	// Possible values:
	// - "header:<name>"
	// - "form:<name>"
	// - "query:<name>"
	TokenLookup string `json:"token_lookup"`

	// Context key to store generated CSRF token into context.
	// Optional. Default value "csrf".
	ContextKey string `json:"context_key"`

	// Name of the CSRF session. This session will store CSRF token.
	// Optional. Default value "_csrf".
	SessionName string `json:"session_name"`
}

type GzipConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper `json:"-"`

	// Gzip compression level.
	// Optional. Default value -1.
	Level int `json:"level"`
}

type KeyAuthConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper

	// KeyLookup is a string in the form of "<source>:<name>" that is used
	// to extract key from the request.
	// Optional. Default value "header:Authorization".
	// Possible values:
	// - "header:<name>"
	// - "query:<name>"
	// - "form:<name>"
	KeyLookup string `yaml:"key_lookup"`

	// AuthScheme to be used in the Authorization header.
	// Optional. Default value "Bearer".
	AuthScheme string

	// Validator is a function to validate key.
	// Required.
	Validator KeyAuthValidator
}

type KeyAuthValidator func(string, echo.Context) (bool, error)

type LogConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper       `json:"-"`
	Writer  io.Writer          `json:"-"`
	Execute func(*VisitorInfo) `json:"-"`
}

type MethodOverrideConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper

	// Getter is a function that gets overridden method from the request.
	// Optional. Default values MethodFromHeader(echo.HeaderXHTTPMethodOverride).
	Getter MethodOverrideGetter
}

type MethodOverrideGetter func(echo.Context) string

type ProxyBalancer interface {
	AddTarget(ProxyTargeter) bool
	RemoveTarget(string) bool
	Next(echo.Context) ProxyTargeter
}

type ProxyConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper `json:"-"`

	// Balancer defines a load balancing technique.
	// Required.
	Balancer ProxyBalancer `json:"-"`

	Handler ProxyHandler `json:"-"`
	Rewrite RewriteConfig

	// Context key to store selected ProxyTarget into context.
	// Optional. Default value "target".
	ContextKey string
}

type ProxyHandler func(t ProxyTargeter, c echo.Context) error

type ProxyTarget struct {
	Name          string
	URL           *url.URL
	FlushInterval time.Duration
	Meta          echo.Store
}

type ProxyTargeter interface {
	GetName() string
	GetURL(echo.Context) *url.URL
	GetFlushInterval() time.Duration
	SetFlushInterval(time.Duration)
	GetMeta(echo.Context) echo.Store
}

type QueueConfig struct {
	Skipper echo.Skipper

	QueueSize int
	Workers   int

	QueueTimeout  time.Duration
	WorkerTimeout time.Duration
}

type RecoverConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper

	// Size of the stack to be printed.
	// Optional. Default value 4KB.
	StackSize int `json:"stack_size"`

	// DisableStackAll disables formatting stack traces of all other goroutines
	// into buffer after the trace for the current goroutine.
	// Optional. Default value false.
	DisableStackAll bool `json:"disable_stack_all"`

	// DisablePrintStack disables printing stack trace.
	// Optional. Default value as false.
	DisablePrintStack bool `json:"disable_print_stack"`
}

type RedirectConfig struct {
	// Skipper defines a function to skip middleware.
	echo.Skipper

	// Status code to be used when redirecting the request.
	// Optional. Default value http.StatusMovedPermanently.
	Code int `yaml:"code"`
}

type RequestIDConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper

	// Generator defines a function to generate an ID.
	// Optional. Default value random.String(32).
	Generator func() string

	// RequestIDHandler defines a function which is executed for a request id.
	RequestIDHandler func(echo.Context, string)
}

type RewriteConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper `json:"-"`

	// Rules defines the URL path rewrite rules. The values captured in asterisk can be
	// retrieved by index e.g. $1, $2 and so on.
	// Example:
	// "/old":              "/new",
	// "/api/*":            "/$1",
	// "/js/*":             "/public/javascripts/$1",
	// "/users/*/orders/*": "/user/$1/order/$2",
	// "/users/:id": "/user/$1",
	// "/match/<name:[0-9]+>": "/user/$1",
	// Required.
	Rules             map[string]string `json:"rules"`
	DisableColonParam bool
	// contains filtered or unexported fields
}

type RewriteRegExp struct {
	Old   *regexp.Regexp
	New   *regexp.Regexp
	Named map[string]string
}

type SecureConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper `json:"-"`

	// XSSProtection provides protection against cross-site scripting attack (XSS)
	// by setting the `X-XSS-Protection` header.
	// Optional. Default value "1; mode=block".
	XSSProtection string `json:"xss_protection"`

	// ContentTypeNosniff provides protection against overriding Content-Type
	// header by setting the `X-Content-Type-Options` header.
	// Optional. Default value "nosniff".
	ContentTypeNosniff string `json:"content_type_nosniff"`

	// XFrameOptions can be used to indicate whether or not a browser should
	// be allowed to render a page in a <frame>, <iframe> or <object> .
	// Sites can use this to avoid clickjacking attacks, by ensuring that their
	// content is not embedded into other sites.provides protection against
	// clickjacking.
	// Optional. Default value "SAMEORIGIN".
	// Possible values:
	// - "SAMEORIGIN" - The page can only be displayed in a frame on the same origin as the page itself.
	// - "DENY" - The page cannot be displayed in a frame, regardless of the site attempting to do so.
	// - "ALLOW-FROM uri" - The page can only be displayed in a frame on the specified origin.
	XFrameOptions string `json:"x_frame_options"`

	// HSTSMaxAge sets the `Strict-Transport-Security` header to indicate how
	// long (in seconds) browsers should remember that this site is only to
	// be accessed using HTTPS. This reduces your exposure to some SSL-stripping
	// man-in-the-middle (MITM) attacks.
	// Optional. Default value 0.
	HSTSMaxAge int `json:"hsts_max_age"`

	// HSTSExcludeSubdomains won't include subdomains tag in the `Strict Transport Security`
	// header, excluding all subdomains from security policy. It has no effect
	// unless HSTSMaxAge is set to a non-zero value.
	// Optional. Default value false.
	HSTSExcludeSubdomains bool `json:"hsts_exclude_subdomains"`

	// ContentSecurityPolicy sets the `Content-Security-Policy` header providing
	// security against cross-site scripting (XSS), clickjacking and other code
	// injection attacks resulting from execution of malicious content in the
	// trusted web page context.
	// Optional. Default value "".
	ContentSecurityPolicy string `json:"content_security_policy"`
}

type StaticOptions struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper `json:"-"`

	Path       string          `json:"path"` //UrlPath
	Root       string          `json:"root"`
	Fallback   []string        `json:"fallback"`
	Index      string          `json:"index"`
	Browse     bool            `json:"browse"`
	Template   string          `json:"template"`
	Debug      bool            `json:"debug"`
	FS         http.FileSystem `json:"-"`
	MaxAge     time.Duration   `json:"maxAge"`
	TrimPrefix string          `json:"trimPrefix"`
	// contains filtered or unexported fields
}

type TrailingSlashConfig struct {
	// Skipper defines a function to skip middleware.
	Skipper echo.Skipper `json:"-"`

	// Status code to be used when redirecting the request.
	// Optional, but when provided the request is redirected using this code.
	RedirectCode int `json:"redirect_code"`
}

type VisitorInfo struct {
	RealIP       string
	Time         time.Time
	Elapsed      time.Duration
	Scheme       string
	Host         string
	URI          string
	Method       string
	UserAgent    string
	Referer      string
	RequestSize  int64
	ResponseSize int64
	ResponseCode int
}