middleware

package
v4.12.0 Latest Latest
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Published: Apr 15, 2024 License: MIT Imports: 34 Imported by: 5,671

Documentation

Index

Constants

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const (
	AlgorithmHS256 = "HS256"
)

Algorithms

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const GZIPEncoding string = "gzip"

GZIPEncoding content-encoding header if set to "gzip", decompress body contents.

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const StatusCodeContextCanceled = 499

StatusCodeContextCanceled is a custom HTTP status code for situations where a client unexpectedly closed the connection to the server. As there is no standard error code for "client closed connection", but various well-known HTTP clients and server implement this HTTP code we use 499 too instead of the more problematic 5xx, which does not allow to detect this situation

Variables

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var DefaultBasicAuthConfig = BasicAuthConfig{
	Skipper: DefaultSkipper,
	Realm:   defaultRealm,
}

DefaultBasicAuthConfig is the default BasicAuth middleware config.

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var DefaultBodyDumpConfig = BodyDumpConfig{
	Skipper: DefaultSkipper,
}

DefaultBodyDumpConfig is the default BodyDump middleware config.

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var DefaultBodyLimitConfig = BodyLimitConfig{
	Skipper: DefaultSkipper,
}

DefaultBodyLimitConfig is the default BodyLimit middleware config.

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var DefaultCORSConfig = CORSConfig{
	Skipper:      DefaultSkipper,
	AllowOrigins: []string{"*"},
	AllowMethods: []string{http.MethodGet, http.MethodHead, http.MethodPut, http.MethodPatch, http.MethodPost, http.MethodDelete},
}

DefaultCORSConfig is the default CORS middleware config.

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var DefaultCSRFConfig = CSRFConfig{
	Skipper:        DefaultSkipper,
	TokenLength:    32,
	TokenLookup:    "header:" + echo.HeaderXCSRFToken,
	ContextKey:     "csrf",
	CookieName:     "_csrf",
	CookieMaxAge:   86400,
	CookieSameSite: http.SameSiteDefaultMode,
}

DefaultCSRFConfig is the default CSRF middleware config.

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var DefaultDecompressConfig = DecompressConfig{
	Skipper:            DefaultSkipper,
	GzipDecompressPool: &DefaultGzipDecompressPool{},
}

DefaultDecompressConfig defines the config for decompress middleware

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var DefaultGzipConfig = GzipConfig{
	Skipper:   DefaultSkipper,
	Level:     -1,
	MinLength: 0,
}

DefaultGzipConfig is the default Gzip middleware config.

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var DefaultJWTConfig = JWTConfig{
	Skipper:          DefaultSkipper,
	SigningMethod:    AlgorithmHS256,
	ContextKey:       "user",
	TokenLookup:      "header:" + echo.HeaderAuthorization,
	TokenLookupFuncs: nil,
	AuthScheme:       "Bearer",
	Claims:           jwt.MapClaims{},
	KeyFunc:          nil,
}

DefaultJWTConfig is the default JWT auth middleware config.

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var DefaultKeyAuthConfig = KeyAuthConfig{
	Skipper:    DefaultSkipper,
	KeyLookup:  "header:" + echo.HeaderAuthorization,
	AuthScheme: "Bearer",
}

DefaultKeyAuthConfig is the default KeyAuth middleware config.

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var DefaultLoggerConfig = LoggerConfig{
	Skipper: DefaultSkipper,
	Format: `{"time":"${time_rfc3339_nano}","id":"${id}","remote_ip":"${remote_ip}",` +
		`"host":"${host}","method":"${method}","uri":"${uri}","user_agent":"${user_agent}",` +
		`"status":${status},"error":"${error}","latency":${latency},"latency_human":"${latency_human}"` +
		`,"bytes_in":${bytes_in},"bytes_out":${bytes_out}}` + "\n",
	CustomTimeFormat: "2006-01-02 15:04:05.00000",
	// contains filtered or unexported fields
}

DefaultLoggerConfig is the default Logger middleware config.

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var DefaultMethodOverrideConfig = MethodOverrideConfig{
	Skipper: DefaultSkipper,
	Getter:  MethodFromHeader(echo.HeaderXHTTPMethodOverride),
}

DefaultMethodOverrideConfig is the default MethodOverride middleware config.

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var DefaultProxyConfig = ProxyConfig{
	Skipper:    DefaultSkipper,
	ContextKey: "target",
}

DefaultProxyConfig is the default Proxy middleware config.

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var DefaultRateLimiterConfig = RateLimiterConfig{
	Skipper: DefaultSkipper,
	IdentifierExtractor: func(ctx echo.Context) (string, error) {
		id := ctx.RealIP()
		return id, nil
	},
	ErrorHandler: func(context echo.Context, err error) error {
		return &echo.HTTPError{
			Code:     ErrExtractorError.Code,
			Message:  ErrExtractorError.Message,
			Internal: err,
		}
	},
	DenyHandler: func(context echo.Context, identifier string, err error) error {
		return &echo.HTTPError{
			Code:     ErrRateLimitExceeded.Code,
			Message:  ErrRateLimitExceeded.Message,
			Internal: err,
		}
	},
}

DefaultRateLimiterConfig defines default values for RateLimiterConfig

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var DefaultRateLimiterMemoryStoreConfig = RateLimiterMemoryStoreConfig{
	ExpiresIn: 3 * time.Minute,
}

DefaultRateLimiterMemoryStoreConfig provides default configuration values for RateLimiterMemoryStore

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var DefaultRecoverConfig = RecoverConfig{
	Skipper:             DefaultSkipper,
	StackSize:           4 << 10,
	DisableStackAll:     false,
	DisablePrintStack:   false,
	LogLevel:            0,
	LogErrorFunc:        nil,
	DisableErrorHandler: false,
}

DefaultRecoverConfig is the default Recover middleware config.

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var DefaultRedirectConfig = RedirectConfig{
	Skipper: DefaultSkipper,
	Code:    http.StatusMovedPermanently,
}

DefaultRedirectConfig is the default Redirect middleware config.

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var DefaultRequestIDConfig = RequestIDConfig{
	Skipper:      DefaultSkipper,
	Generator:    generator,
	TargetHeader: echo.HeaderXRequestID,
}

DefaultRequestIDConfig is the default RequestID middleware config.

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var DefaultRewriteConfig = RewriteConfig{
	Skipper: DefaultSkipper,
}

DefaultRewriteConfig is the default Rewrite middleware config.

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var DefaultSecureConfig = SecureConfig{
	Skipper:            DefaultSkipper,
	XSSProtection:      "1; mode=block",
	ContentTypeNosniff: "nosniff",
	XFrameOptions:      "SAMEORIGIN",
	HSTSPreloadEnabled: false,
}

DefaultSecureConfig is the default Secure middleware config.

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var DefaultStaticConfig = StaticConfig{
	Skipper: DefaultSkipper,
	Index:   "index.html",
}

DefaultStaticConfig is the default Static middleware config.

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var DefaultTimeoutConfig = TimeoutConfig{
	Skipper:      DefaultSkipper,
	Timeout:      0,
	ErrorMessage: "",
}

DefaultTimeoutConfig is the default Timeout middleware config.

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var DefaultTrailingSlashConfig = TrailingSlashConfig{
	Skipper: DefaultSkipper,
}

DefaultTrailingSlashConfig is the default TrailingSlash middleware config.

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var ErrCSRFInvalid = echo.NewHTTPError(http.StatusForbidden, "invalid csrf token")

ErrCSRFInvalid is returned when CSRF check fails

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var ErrExtractorError = echo.NewHTTPError(http.StatusForbidden, "error while extracting identifier")

ErrExtractorError denotes an error raised when extractor function is unsuccessful

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var ErrJWTInvalid = echo.NewHTTPError(http.StatusUnauthorized, "invalid or expired jwt")

ErrJWTInvalid is error that is returned when middleware could not parse JWT correctly.

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var ErrJWTMissing = echo.NewHTTPError(http.StatusBadRequest, "missing or malformed jwt")

ErrJWTMissing is error that is returned when no JWToken was extracted from the request.

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var ErrRateLimitExceeded = echo.NewHTTPError(http.StatusTooManyRequests, "rate limit exceeded")

ErrRateLimitExceeded denotes an error raised when rate limit is exceeded

Functions

func AddTrailingSlash

func AddTrailingSlash() echo.MiddlewareFunc

AddTrailingSlash returns a root level (before router) middleware which adds a trailing slash to the request `URL#Path`.

Usage `Echo#Pre(AddTrailingSlash())`

func AddTrailingSlashWithConfig

func AddTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc

AddTrailingSlashWithConfig returns an AddTrailingSlash middleware with config. See `AddTrailingSlash()`.

func BasicAuth

func BasicAuth(fn BasicAuthValidator) echo.MiddlewareFunc

BasicAuth returns an BasicAuth middleware.

For valid credentials it calls the next handler. For missing or invalid credentials, it sends "401 - Unauthorized" response.

func BasicAuthWithConfig

func BasicAuthWithConfig(config BasicAuthConfig) echo.MiddlewareFunc

BasicAuthWithConfig returns an BasicAuth middleware with config. See `BasicAuth()`.

func BodyDump

func BodyDump(handler BodyDumpHandler) echo.MiddlewareFunc

BodyDump returns a BodyDump middleware.

BodyDump middleware captures the request and response payload and calls the registered handler.

func BodyDumpWithConfig

func BodyDumpWithConfig(config BodyDumpConfig) echo.MiddlewareFunc

BodyDumpWithConfig returns a BodyDump middleware with config. See: `BodyDump()`.

func BodyLimit

func BodyLimit(limit string) echo.MiddlewareFunc

BodyLimit returns a BodyLimit middleware.

BodyLimit middleware sets the maximum allowed size for a request body, if the size exceeds the configured limit, it sends "413 - Request Entity Too Large" response. The BodyLimit is determined based on both `Content-Length` request header and actual content read, which makes it super secure. Limit can be specified as `4x` or `4xB`, where x is one of the multiple from K, M, G, T or P.

func BodyLimitWithConfig

func BodyLimitWithConfig(config BodyLimitConfig) echo.MiddlewareFunc

BodyLimitWithConfig returns a BodyLimit middleware with config. See: `BodyLimit()`.

func CORS

func CORS() echo.MiddlewareFunc

CORS returns a Cross-Origin Resource Sharing (CORS) middleware. See also MDN: Cross-Origin Resource Sharing (CORS).

Security: Poorly configured CORS can compromise security because it allows relaxation of the browser's Same-Origin policy. See Exploiting CORS misconfigurations for Bitcoins and bounties and Portswigger: Cross-origin resource sharing (CORS) for more details.

func CORSWithConfig

func CORSWithConfig(config CORSConfig) echo.MiddlewareFunc

CORSWithConfig returns a CORS middleware with config. See: CORS.

func CSRF

func CSRF() echo.MiddlewareFunc

CSRF returns a Cross-Site Request Forgery (CSRF) middleware. See: https://en.wikipedia.org/wiki/Cross-site_request_forgery

func CSRFWithConfig

func CSRFWithConfig(config CSRFConfig) echo.MiddlewareFunc

CSRFWithConfig returns a CSRF middleware with config. See `CSRF()`.

func ContextTimeout added in v4.10.1

func ContextTimeout(timeout time.Duration) echo.MiddlewareFunc

ContextTimeout returns a middleware which returns error (503 Service Unavailable error) to client when underlying method returns context.DeadlineExceeded error.

func ContextTimeoutWithConfig added in v4.10.1

func ContextTimeoutWithConfig(config ContextTimeoutConfig) echo.MiddlewareFunc

ContextTimeoutWithConfig returns a Timeout middleware with config.

func Decompress added in v4.2.0

func Decompress() echo.MiddlewareFunc

Decompress decompresses request body based if content encoding type is set to "gzip" with default config

func DecompressWithConfig added in v4.2.0

func DecompressWithConfig(config DecompressConfig) echo.MiddlewareFunc

DecompressWithConfig decompresses request body based if content encoding type is set to "gzip" with config

func DefaultSkipper

func DefaultSkipper(echo.Context) bool

DefaultSkipper returns false which processes the middleware.

func Gzip

func Gzip() echo.MiddlewareFunc

Gzip returns a middleware which compresses HTTP response using gzip compression scheme.

func GzipWithConfig

func GzipWithConfig(config GzipConfig) echo.MiddlewareFunc

GzipWithConfig return Gzip middleware with config. See: `Gzip()`.

func HTTPSNonWWWRedirect

func HTTPSNonWWWRedirect() echo.MiddlewareFunc

HTTPSNonWWWRedirect redirects http requests to https non www. For example, http://www.labstack.com will be redirect to https://labstack.com.

Usage `Echo#Pre(HTTPSNonWWWRedirect())`

func HTTPSNonWWWRedirectWithConfig

func HTTPSNonWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc

HTTPSNonWWWRedirectWithConfig returns an HTTPSRedirect middleware with config. See `HTTPSNonWWWRedirect()`.

func HTTPSRedirect

func HTTPSRedirect() echo.MiddlewareFunc

HTTPSRedirect redirects http requests to https. For example, http://labstack.com will be redirect to https://labstack.com.

Usage `Echo#Pre(HTTPSRedirect())`

func HTTPSRedirectWithConfig

func HTTPSRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc

HTTPSRedirectWithConfig returns an HTTPSRedirect middleware with config. See `HTTPSRedirect()`.

func HTTPSWWWRedirect

func HTTPSWWWRedirect() echo.MiddlewareFunc

HTTPSWWWRedirect redirects http requests to https www. For example, http://labstack.com will be redirect to https://www.labstack.com.

Usage `Echo#Pre(HTTPSWWWRedirect())`

func HTTPSWWWRedirectWithConfig

func HTTPSWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc

HTTPSWWWRedirectWithConfig returns an HTTPSRedirect middleware with config. See `HTTPSWWWRedirect()`.

func JWT deprecated

func JWT(key interface{}) echo.MiddlewareFunc

JWT returns a JSON Web Token (JWT) auth middleware.

For valid token, it sets the user in context and calls next handler. For invalid token, it returns "401 - Unauthorized" error. For missing token, it returns "400 - Bad Request" error.

See: https://jwt.io/introduction See `JWTConfig.TokenLookup`

Deprecated: Please use https://github.com/labstack/echo-jwt instead

func JWTWithConfig deprecated

func JWTWithConfig(config JWTConfig) echo.MiddlewareFunc

JWTWithConfig returns a JWT auth middleware with config. See: `JWT()`.

Deprecated: Please use https://github.com/labstack/echo-jwt instead

func KeyAuth

func KeyAuth(fn KeyAuthValidator) echo.MiddlewareFunc

KeyAuth returns an KeyAuth middleware.

For valid key it calls the next handler. For invalid key, it sends "401 - Unauthorized" response. For missing key, it sends "400 - Bad Request" response.

func KeyAuthWithConfig

func KeyAuthWithConfig(config KeyAuthConfig) echo.MiddlewareFunc

KeyAuthWithConfig returns an KeyAuth middleware with config. See `KeyAuth()`.

func Logger

func Logger() echo.MiddlewareFunc

Logger returns a middleware that logs HTTP requests.

func LoggerWithConfig

func LoggerWithConfig(config LoggerConfig) echo.MiddlewareFunc

LoggerWithConfig returns a Logger middleware with config. See: `Logger()`.

func MethodOverride

func MethodOverride() echo.MiddlewareFunc

MethodOverride returns a MethodOverride middleware. MethodOverride middleware checks for the overridden method from the request and uses it instead of the original method.

For security reasons, only `POST` method can be overridden.

func MethodOverrideWithConfig

func MethodOverrideWithConfig(config MethodOverrideConfig) echo.MiddlewareFunc

MethodOverrideWithConfig returns a MethodOverride middleware with config. See: `MethodOverride()`.

func NonWWWRedirect

func NonWWWRedirect() echo.MiddlewareFunc

NonWWWRedirect redirects www requests to non www. For example, http://www.labstack.com will be redirect to http://labstack.com.

Usage `Echo#Pre(NonWWWRedirect())`

func NonWWWRedirectWithConfig

func NonWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc

NonWWWRedirectWithConfig returns an HTTPSRedirect middleware with config. See `NonWWWRedirect()`.

func Proxy

func Proxy(balancer ProxyBalancer) echo.MiddlewareFunc

Proxy returns a Proxy middleware.

Proxy middleware forwards the request to upstream server using a configured load balancing technique.

func ProxyWithConfig

func ProxyWithConfig(config ProxyConfig) echo.MiddlewareFunc

ProxyWithConfig returns a Proxy middleware with config. See: `Proxy()`

func RateLimiter added in v4.2.0

func RateLimiter(store RateLimiterStore) echo.MiddlewareFunc

RateLimiter returns a rate limiting middleware

e := echo.New()

limiterStore := middleware.NewRateLimiterMemoryStore(20)

e.GET("/rate-limited", func(c echo.Context) error {
	return c.String(http.StatusOK, "test")
}, RateLimiter(limiterStore))

func RateLimiterWithConfig added in v4.2.0

func RateLimiterWithConfig(config RateLimiterConfig) echo.MiddlewareFunc

RateLimiterWithConfig returns a rate limiting middleware

e := echo.New()

config := middleware.RateLimiterConfig{
	Skipper: DefaultSkipper,
	Store: middleware.NewRateLimiterMemoryStore(
		middleware.RateLimiterMemoryStoreConfig{Rate: 10, Burst: 30, ExpiresIn: 3 * time.Minute}
	)
	IdentifierExtractor: func(ctx echo.Context) (string, error) {
		id := ctx.RealIP()
		return id, nil
	},
	ErrorHandler: func(context echo.Context, err error) error {
		return context.JSON(http.StatusTooManyRequests, nil)
	},
	DenyHandler: func(context echo.Context, identifier string) error {
		return context.JSON(http.StatusForbidden, nil)
	},
}

e.GET("/rate-limited", func(c echo.Context) error {
	return c.String(http.StatusOK, "test")
}, middleware.RateLimiterWithConfig(config))

func Recover

func Recover() echo.MiddlewareFunc

Recover returns a middleware which recovers from panics anywhere in the chain and handles the control to the centralized HTTPErrorHandler.

func RecoverWithConfig

func RecoverWithConfig(config RecoverConfig) echo.MiddlewareFunc

RecoverWithConfig returns a Recover middleware with config. See: `Recover()`.

func RemoveTrailingSlash

func RemoveTrailingSlash() echo.MiddlewareFunc

RemoveTrailingSlash returns a root level (before router) middleware which removes a trailing slash from the request URI.

Usage `Echo#Pre(RemoveTrailingSlash())`

func RemoveTrailingSlashWithConfig

func RemoveTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc

RemoveTrailingSlashWithConfig returns a RemoveTrailingSlash middleware with config. See `RemoveTrailingSlash()`.

func RequestID

func RequestID() echo.MiddlewareFunc

RequestID returns a X-Request-ID middleware.

func RequestIDWithConfig

func RequestIDWithConfig(config RequestIDConfig) echo.MiddlewareFunc

RequestIDWithConfig returns a X-Request-ID middleware with config.

func RequestLoggerWithConfig added in v4.6.0

func RequestLoggerWithConfig(config RequestLoggerConfig) echo.MiddlewareFunc

RequestLoggerWithConfig returns a RequestLogger middleware with config.

func Rewrite

func Rewrite(rules map[string]string) echo.MiddlewareFunc

Rewrite returns a Rewrite middleware.

Rewrite middleware rewrites the URL path based on the provided rules.

func RewriteWithConfig

func RewriteWithConfig(config RewriteConfig) echo.MiddlewareFunc

RewriteWithConfig returns a Rewrite middleware with config. See: `Rewrite()`.

func Secure

func Secure() echo.MiddlewareFunc

Secure returns a Secure middleware. Secure middleware provides protection against cross-site scripting (XSS) attack, content type sniffing, clickjacking, insecure connection and other code injection attacks.

func SecureWithConfig

func SecureWithConfig(config SecureConfig) echo.MiddlewareFunc

SecureWithConfig returns a Secure middleware with config. See: `Secure()`.

func Static

func Static(root string) echo.MiddlewareFunc

Static returns a Static middleware to serves static content from the provided root directory.

func StaticWithConfig

func StaticWithConfig(config StaticConfig) echo.MiddlewareFunc

StaticWithConfig returns a Static middleware with config. See `Static()`.

func Timeout added in v4.2.0

func Timeout() echo.MiddlewareFunc

Timeout returns a middleware which returns error (503 Service Unavailable error) to client immediately when handler call runs for longer than its time limit. NB: timeout does not stop handler execution.

func TimeoutWithConfig added in v4.2.0

func TimeoutWithConfig(config TimeoutConfig) echo.MiddlewareFunc

TimeoutWithConfig returns a Timeout middleware with config or panics on invalid configuration.

func WWWRedirect

func WWWRedirect() echo.MiddlewareFunc

WWWRedirect redirects non www requests to www. For example, http://labstack.com will be redirect to http://www.labstack.com.

Usage `Echo#Pre(WWWRedirect())`

func WWWRedirectWithConfig

func WWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc

WWWRedirectWithConfig returns an HTTPSRedirect middleware with config. See `WWWRedirect()`.

Types

type BasicAuthConfig

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

	// Validator is a function to validate BasicAuth credentials.
	// Required.
	Validator BasicAuthValidator

	// Realm is a string to define realm attribute of BasicAuth.
	// Default value "Restricted".
	Realm string
}

BasicAuthConfig defines the config for BasicAuth middleware.

type BasicAuthValidator

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

BasicAuthValidator defines a function to validate BasicAuth credentials. The function should return a boolean indicating whether the credentials are valid, and an error if any error occurs during the validation process.

type BeforeFunc

type BeforeFunc func(c echo.Context)

BeforeFunc defines a function which is executed just before the middleware.

type BodyDumpConfig

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

	// Handler receives request and response payload.
	// Required.
	Handler BodyDumpHandler
}

BodyDumpConfig defines the config for BodyDump middleware.

type BodyDumpHandler

type BodyDumpHandler func(echo.Context, []byte, []byte)

BodyDumpHandler receives the request and response payload.

type BodyLimitConfig

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

	// 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 `yaml:"limit"`
	// contains filtered or unexported fields
}

BodyLimitConfig defines the config for BodyLimit middleware.

type CORSConfig

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

	// AllowOrigins determines the value of the Access-Control-Allow-Origin
	// response header.  This header defines a list of origins that may access the
	// resource.  The wildcard characters '*' and '?' are supported and are
	// converted to regex fragments '.*' and '.' accordingly.
	//
	// Security: use extreme caution when handling the origin, and carefully
	// validate any logic. Remember that attackers may register hostile domain names.
	// See https://blog.portswigger.net/2016/10/exploiting-cors-misconfigurations-for.html
	//
	// Optional. Default value []string{"*"}.
	//
	// See also: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin
	AllowOrigins []string `yaml:"allow_origins"`

	// AllowOriginFunc is a custom function to validate the origin. It takes the
	// origin as an argument and returns true if allowed or false otherwise. If
	// an error is returned, it is returned by the handler. If this option is
	// set, AllowOrigins is ignored.
	//
	// Security: use extreme caution when handling the origin, and carefully
	// validate any logic. Remember that attackers may register hostile domain names.
	// See https://blog.portswigger.net/2016/10/exploiting-cors-misconfigurations-for.html
	//
	// Optional.
	AllowOriginFunc func(origin string) (bool, error) `yaml:"-"`

	// AllowMethods determines the value of the Access-Control-Allow-Methods
	// response header.  This header specified the list of methods allowed when
	// accessing the resource.  This is used in response to a preflight request.
	//
	// Optional. Default value DefaultCORSConfig.AllowMethods.
	// If `allowMethods` is left empty, this middleware will fill for preflight
	// request `Access-Control-Allow-Methods` header value
	// from `Allow` header that echo.Router set into context.
	//
	// See also: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Methods
	AllowMethods []string `yaml:"allow_methods"`

	// AllowHeaders determines the value of the Access-Control-Allow-Headers
	// response header.  This header is used in response to a preflight request to
	// indicate which HTTP headers can be used when making the actual request.
	//
	// Optional. Default value []string{}.
	//
	// See also: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Headers
	AllowHeaders []string `yaml:"allow_headers"`

	// AllowCredentials determines the value of the
	// Access-Control-Allow-Credentials response header.  This header indicates
	// whether or not the response to the request can be exposed when the
	// credentials mode (Request.credentials) 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.  See also
	// [MDN: Access-Control-Allow-Credentials].
	//
	// Optional. Default value false, in which case the header is not set.
	//
	// Security: avoid using `AllowCredentials = true` with `AllowOrigins = *`.
	// See "Exploiting CORS misconfigurations for Bitcoins and bounties",
	// https://blog.portswigger.net/2016/10/exploiting-cors-misconfigurations-for.html
	//
	// See also: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials
	AllowCredentials bool `yaml:"allow_credentials"`

	// UnsafeWildcardOriginWithAllowCredentials UNSAFE/INSECURE: allows wildcard '*' origin to be used with AllowCredentials
	// flag. In that case we consider any origin allowed and send it back to the client with `Access-Control-Allow-Origin` header.
	//
	// This is INSECURE and potentially leads to [cross-origin](https://portswigger.net/research/exploiting-cors-misconfigurations-for-bitcoins-and-bounties)
	// attacks. See: https://github.com/labstack/echo/issues/2400 for discussion on the subject.
	//
	// Optional. Default value is false.
	UnsafeWildcardOriginWithAllowCredentials bool `yaml:"unsafe_wildcard_origin_with_allow_credentials"`

	// ExposeHeaders determines the value of Access-Control-Expose-Headers, which
	// defines a list of headers that clients are allowed to access.
	//
	// Optional. Default value []string{}, in which case the header is not set.
	//
	// See also: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Expose-Header
	ExposeHeaders []string `yaml:"expose_headers"`

	// MaxAge determines the value of the Access-Control-Max-Age response header.
	// This header indicates how long (in seconds) the results of a preflight
	// request can be cached.
	// The header is set only if MaxAge != 0, negative value sends "0" which instructs browsers not to cache that response.
	//
	// Optional. Default value 0 - meaning header is not sent.
	//
	// See also: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Max-Age
	MaxAge int `yaml:"max_age"`
}

CORSConfig defines the config for CORS middleware.

type CSRFConfig

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

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

	// TokenLookup is a string in the form of "<source>:<name>" or "<source>:<name>,<source>:<name>" that is used
	// to extract token from the request.
	// Optional. Default value "header:X-CSRF-Token".
	// Possible values:
	// - "header:<name>" or "header:<name>:<cut-prefix>"
	// - "query:<name>"
	// - "form:<name>"
	// Multiple sources example:
	// - "header:X-CSRF-Token,query:csrf"
	TokenLookup string `yaml:"token_lookup"`

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

	// Name of the CSRF cookie. This cookie will store CSRF token.
	// Optional. Default value "csrf".
	CookieName string `yaml:"cookie_name"`

	// Domain of the CSRF cookie.
	// Optional. Default value none.
	CookieDomain string `yaml:"cookie_domain"`

	// Path of the CSRF cookie.
	// Optional. Default value none.
	CookiePath string `yaml:"cookie_path"`

	// Max age (in seconds) of the CSRF cookie.
	// Optional. Default value 86400 (24hr).
	CookieMaxAge int `yaml:"cookie_max_age"`

	// Indicates if CSRF cookie is secure.
	// Optional. Default value false.
	CookieSecure bool `yaml:"cookie_secure"`

	// Indicates if CSRF cookie is HTTP only.
	// Optional. Default value false.
	CookieHTTPOnly bool `yaml:"cookie_http_only"`

	// Indicates SameSite mode of the CSRF cookie.
	// Optional. Default value SameSiteDefaultMode.
	CookieSameSite http.SameSite `yaml:"cookie_same_site"`

	// ErrorHandler defines a function which is executed for returning custom errors.
	ErrorHandler CSRFErrorHandler
}

CSRFConfig defines the config for CSRF middleware.

type CSRFErrorHandler added in v4.9.0

type CSRFErrorHandler func(err error, c echo.Context) error

CSRFErrorHandler is a function which is executed for creating custom errors.

type ContextTimeoutConfig added in v4.10.1

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

	// ErrorHandler is a function when error aries in middleware execution.
	ErrorHandler func(err error, c echo.Context) error

	// Timeout configures a timeout for the middleware, defaults to 0 for no timeout
	Timeout time.Duration
}

ContextTimeoutConfig defines the config for ContextTimeout middleware.

func (ContextTimeoutConfig) ToMiddleware added in v4.10.1

func (config ContextTimeoutConfig) ToMiddleware() (echo.MiddlewareFunc, error)

ToMiddleware converts Config to middleware.

type DecompressConfig added in v4.2.0

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

	// GzipDecompressPool defines an interface to provide the sync.Pool used to create/store Gzip readers
	GzipDecompressPool Decompressor
}

DecompressConfig defines the config for Decompress middleware.

type Decompressor added in v4.2.0

type Decompressor interface {
	// contains filtered or unexported methods
}

Decompressor is used to get the sync.Pool used by the middleware to get Gzip readers

type DefaultGzipDecompressPool added in v4.2.0

type DefaultGzipDecompressPool struct {
}

DefaultGzipDecompressPool is the default implementation of Decompressor interface

type ErrKeyAuthMissing added in v4.7.0

type ErrKeyAuthMissing struct {
	Err error
}

ErrKeyAuthMissing is error type when KeyAuth middleware is unable to extract value from lookups

func (*ErrKeyAuthMissing) Error added in v4.7.0

func (e *ErrKeyAuthMissing) Error() string

Error returns errors text

func (*ErrKeyAuthMissing) Unwrap added in v4.7.0

func (e *ErrKeyAuthMissing) Unwrap() error

Unwrap unwraps error

type Extractor added in v4.2.0

type Extractor func(context echo.Context) (string, error)

Extractor is used to extract data from echo.Context

type GzipConfig

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

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

	// Length threshold before gzip compression is applied.
	// Optional. Default value 0.
	//
	// Most of the time you will not need to change the default. Compressing
	// a short response might increase the transmitted data because of the
	// gzip format overhead. Compressing the response will also consume CPU
	// and time on the server and the client (for decompressing). Depending on
	// your use case such a threshold might be useful.
	//
	// See also:
	// https://webmasters.stackexchange.com/questions/31750/what-is-recommended-minimum-object-size-for-gzip-performance-benefits
	MinLength int
}

GzipConfig defines the config for Gzip middleware.

type JWTConfig

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

	// BeforeFunc defines a function which is executed just before the middleware.
	BeforeFunc BeforeFunc

	// SuccessHandler defines a function which is executed for a valid token before middleware chain continues with next
	// middleware or handler.
	SuccessHandler JWTSuccessHandler

	// ErrorHandler defines a function which is executed for an invalid token.
	// It may be used to define a custom JWT error.
	ErrorHandler JWTErrorHandler

	// ErrorHandlerWithContext is almost identical to ErrorHandler, but it's passed the current context.
	ErrorHandlerWithContext JWTErrorHandlerWithContext

	// ContinueOnIgnoredError allows the next middleware/handler to be called when ErrorHandlerWithContext decides to
	// ignore the error (by returning `nil`).
	// This is useful when parts of your site/api allow public access and some authorized routes provide extra functionality.
	// In that case you can use ErrorHandlerWithContext to set a default public JWT token value in the request context
	// and continue. Some logic down the remaining execution chain needs to check that (public) token value then.
	ContinueOnIgnoredError bool

	// Signing key to validate token.
	// This is one of the three options to provide a token validation key.
	// The order of precedence is a user-defined KeyFunc, SigningKeys and SigningKey.
	// Required if neither user-defined KeyFunc nor SigningKeys is provided.
	SigningKey interface{}

	// Map of signing keys to validate token with kid field usage.
	// This is one of the three options to provide a token validation key.
	// The order of precedence is a user-defined KeyFunc, SigningKeys and SigningKey.
	// Required if neither user-defined KeyFunc nor SigningKey is provided.
	SigningKeys map[string]interface{}

	// Signing method used to check the token's signing algorithm.
	// Optional. Default value HS256.
	SigningMethod string

	// Context key to store user information from the token into context.
	// Optional. Default value "user".
	ContextKey string

	// Claims are extendable claims data defining token content. Used by default ParseTokenFunc implementation.
	// Not used if custom ParseTokenFunc is set.
	// Optional. Default value jwt.MapClaims
	Claims jwt.Claims

	// TokenLookup is a string in the form of "<source>:<name>" or "<source>:<name>,<source>:<name>" that is used
	// to extract token from the request.
	// Optional. Default value "header:Authorization".
	// Possible values:
	// - "header:<name>" or "header:<name>:<cut-prefix>"
	// 			`<cut-prefix>` is argument value to cut/trim prefix of the extracted value. This is useful if header
	//			value has static prefix like `Authorization: <auth-scheme> <authorisation-parameters>` where part that we
	//			want to cut is `<auth-scheme> ` note the space at the end.
	//			In case of JWT tokens `Authorization: Bearer <token>` prefix we cut is `Bearer `.
	// If prefix is left empty the whole value is returned.
	// - "query:<name>"
	// - "param:<name>"
	// - "cookie:<name>"
	// - "form:<name>"
	// Multiple sources example:
	// - "header:Authorization,cookie:myowncookie"
	TokenLookup string

	// TokenLookupFuncs defines a list of user-defined functions that extract JWT token from the given context.
	// This is one of the two options to provide a token extractor.
	// The order of precedence is user-defined TokenLookupFuncs, and TokenLookup.
	// You can also provide both if you want.
	TokenLookupFuncs []ValuesExtractor

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

	// KeyFunc defines a user-defined function that supplies the public key for a token validation.
	// The function shall take care of verifying the signing algorithm and selecting the proper key.
	// A user-defined KeyFunc can be useful if tokens are issued by an external party.
	// Used by default ParseTokenFunc implementation.
	//
	// When a user-defined KeyFunc is provided, SigningKey, SigningKeys, and SigningMethod are ignored.
	// This is one of the three options to provide a token validation key.
	// The order of precedence is a user-defined KeyFunc, SigningKeys and SigningKey.
	// Required if neither SigningKeys nor SigningKey is provided.
	// Not used if custom ParseTokenFunc is set.
	// Default to an internal implementation verifying the signing algorithm and selecting the proper key.
	KeyFunc jwt.Keyfunc

	// ParseTokenFunc defines a user-defined function that parses token from given auth. Returns an error when token
	// parsing fails or parsed token is invalid.
	// Defaults to implementation using `github.com/golang-jwt/jwt` as JWT implementation library
	ParseTokenFunc func(auth string, c echo.Context) (interface{}, error)
}

JWTConfig defines the config for JWT middleware.

type JWTErrorHandler

type JWTErrorHandler func(err error) error

JWTErrorHandler defines a function which is executed for an invalid token.

type JWTErrorHandlerWithContext added in v4.1.7

type JWTErrorHandlerWithContext func(err error, c echo.Context) error

JWTErrorHandlerWithContext is almost identical to JWTErrorHandler, but it's passed the current context.

type JWTSuccessHandler

type JWTSuccessHandler func(c echo.Context)

JWTSuccessHandler defines a function which is executed for a valid token.

type KeyAuthConfig

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

	// KeyLookup is a string in the form of "<source>:<name>" or "<source>:<name>,<source>:<name>" that is used
	// to extract key from the request.
	// Optional. Default value "header:Authorization".
	// Possible values:
	// - "header:<name>" or "header:<name>:<cut-prefix>"
	// 			`<cut-prefix>` is argument value to cut/trim prefix of the extracted value. This is useful if header
	//			value has static prefix like `Authorization: <auth-scheme> <authorisation-parameters>` where part that we
	//			want to cut is `<auth-scheme> ` note the space at the end.
	//			In case of basic authentication `Authorization: Basic <credentials>` prefix we want to remove is `Basic `.
	// - "query:<name>"
	// - "form:<name>"
	// - "cookie:<name>"
	// Multiple sources example:
	// - "header:Authorization,header:X-Api-Key"
	KeyLookup string

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

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

	// ErrorHandler defines a function which is executed for an invalid key.
	// It may be used to define a custom error.
	ErrorHandler KeyAuthErrorHandler

	// ContinueOnIgnoredError allows the next middleware/handler to be called when ErrorHandler decides to
	// ignore the error (by returning `nil`).
	// This is useful when parts of your site/api allow public access and some authorized routes provide extra functionality.
	// In that case you can use ErrorHandler to set a default public key auth value in the request context
	// and continue. Some logic down the remaining execution chain needs to check that (public) key auth value then.
	ContinueOnIgnoredError bool
}

KeyAuthConfig defines the config for KeyAuth middleware.

type KeyAuthErrorHandler added in v4.3.0

type KeyAuthErrorHandler func(err error, c echo.Context) error

KeyAuthErrorHandler defines a function which is executed for an invalid key.

type KeyAuthValidator

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

KeyAuthValidator defines a function to validate KeyAuth credentials.

type LogErrorFunc added in v4.7.0

type LogErrorFunc func(c echo.Context, err error, stack []byte) error

LogErrorFunc defines a function for custom logging in the middleware.

type LoggerConfig

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

	// Tags to construct the logger format.
	//
	// - time_unix
	// - time_unix_milli
	// - time_unix_micro
	// - time_unix_nano
	// - time_rfc3339
	// - time_rfc3339_nano
	// - time_custom
	// - id (Request ID)
	// - remote_ip
	// - uri
	// - host
	// - method
	// - path
	// - route
	// - protocol
	// - referer
	// - user_agent
	// - status
	// - error
	// - latency (In nanoseconds)
	// - latency_human (Human readable)
	// - bytes_in (Bytes received)
	// - bytes_out (Bytes sent)
	// - header:<NAME>
	// - query:<NAME>
	// - form:<NAME>
	// - custom (see CustomTagFunc field)
	//
	// Example "${remote_ip} ${status}"
	//
	// Optional. Default value DefaultLoggerConfig.Format.
	Format string `yaml:"format"`

	// Optional. Default value DefaultLoggerConfig.CustomTimeFormat.
	CustomTimeFormat string `yaml:"custom_time_format"`

	// CustomTagFunc is function called for `${custom}` tag to output user implemented text by writing it to buf.
	// Make sure that outputted text creates valid JSON string with other logged tags.
	// Optional.
	CustomTagFunc func(c echo.Context, buf *bytes.Buffer) (int, error)

	// Output is a writer where logs in JSON format are written.
	// Optional. Default value os.Stdout.
	Output io.Writer
	// contains filtered or unexported fields
}

LoggerConfig defines the config for Logger middleware.

type MethodOverrideConfig

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

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

MethodOverrideConfig defines the config for MethodOverride middleware.

type MethodOverrideGetter

type MethodOverrideGetter func(echo.Context) string

MethodOverrideGetter is a function that gets overridden method from the request

func MethodFromForm

func MethodFromForm(param string) MethodOverrideGetter

MethodFromForm is a `MethodOverrideGetter` that gets overridden method from the form parameter.

func MethodFromHeader

func MethodFromHeader(header string) MethodOverrideGetter

MethodFromHeader is a `MethodOverrideGetter` that gets overridden method from the request header.

func MethodFromQuery

func MethodFromQuery(param string) MethodOverrideGetter

MethodFromQuery is a `MethodOverrideGetter` that gets overridden method from the query parameter.

type ProxyBalancer

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

ProxyBalancer defines an interface to implement a load balancing technique.

func NewRandomBalancer

func NewRandomBalancer(targets []*ProxyTarget) ProxyBalancer

NewRandomBalancer returns a random proxy balancer.

func NewRoundRobinBalancer

func NewRoundRobinBalancer(targets []*ProxyTarget) ProxyBalancer

NewRoundRobinBalancer returns a round-robin proxy balancer.

type ProxyConfig

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

	// Balancer defines a load balancing technique.
	// Required.
	Balancer ProxyBalancer

	// RetryCount defines the number of times a failed proxied request should be retried
	// using the next available ProxyTarget. Defaults to 0, meaning requests are never retried.
	RetryCount int

	// RetryFilter defines a function used to determine if a failed request to a
	// ProxyTarget should be retried. The RetryFilter will only be called when the number
	// of previous retries is less than RetryCount. If the function returns true, the
	// request will be retried. The provided error indicates the reason for the request
	// failure. When the ProxyTarget is unavailable, the error will be an instance of
	// echo.HTTPError with a Code of http.StatusBadGateway. In all other cases, the error
	// will indicate an internal error in the Proxy middleware. When a RetryFilter is not
	// specified, all requests that fail with http.StatusBadGateway will be retried. A custom
	// RetryFilter can be provided to only retry specific requests. Note that RetryFilter is
	// only called when the request to the target fails, or an internal error in the Proxy
	// middleware has occurred. Successful requests that return a non-200 response code cannot
	// be retried.
	RetryFilter func(c echo.Context, e error) bool

	// ErrorHandler defines a function which can be used to return custom errors from
	// the Proxy middleware. ErrorHandler is only invoked when there has been
	// either an internal error in the Proxy middleware or the ProxyTarget is
	// unavailable. Due to the way requests are proxied, ErrorHandler is not invoked
	// when a ProxyTarget returns a non-200 response. In these cases, the response
	// is already written so errors cannot be modified. ErrorHandler is only
	// invoked after all retry attempts have been exhausted.
	ErrorHandler func(c echo.Context, err error) error

	// Rewrite defines URL path rewrite rules. The values captured in asterisk can be
	// retrieved by index e.g. $1, $2 and so on.
	// Examples:
	// "/old":              "/new",
	// "/api/*":            "/$1",
	// "/js/*":             "/public/javascripts/$1",
	// "/users/*/orders/*": "/user/$1/order/$2",
	Rewrite map[string]string

	// RegexRewrite defines rewrite rules using regexp.Rexexp with captures
	// Every capture group in the values can be retrieved by index e.g. $1, $2 and so on.
	// Example:
	// "^/old/[0.9]+/":     "/new",
	// "^/api/.+?/(.*)":    "/v2/$1",
	RegexRewrite map[*regexp.Regexp]string

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

	// To customize the transport to remote.
	// Examples: If custom TLS certificates are required.
	Transport http.RoundTripper

	// ModifyResponse defines function to modify response from ProxyTarget.
	ModifyResponse func(*http.Response) error
}

ProxyConfig defines the config for Proxy middleware.

type ProxyTarget

type ProxyTarget struct {
	Name string
	URL  *url.URL
	Meta echo.Map
}

ProxyTarget defines the upstream target.

type RateLimiterConfig added in v4.2.0

type RateLimiterConfig struct {
	Skipper    Skipper
	BeforeFunc BeforeFunc
	// IdentifierExtractor uses echo.Context to extract the identifier for a visitor
	IdentifierExtractor Extractor
	// Store defines a store for the rate limiter
	Store RateLimiterStore
	// ErrorHandler provides a handler to be called when IdentifierExtractor returns an error
	ErrorHandler func(context echo.Context, err error) error
	// DenyHandler provides a handler to be called when RateLimiter denies access
	DenyHandler func(context echo.Context, identifier string, err error) error
}

RateLimiterConfig defines the configuration for the rate limiter

type RateLimiterMemoryStore added in v4.2.0

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

RateLimiterMemoryStore is the built-in store implementation for RateLimiter

func NewRateLimiterMemoryStore added in v4.2.0

func NewRateLimiterMemoryStore(rate rate.Limit) (store *RateLimiterMemoryStore)

NewRateLimiterMemoryStore returns an instance of RateLimiterMemoryStore with the provided rate (as req/s). for more info check out Limiter docs - https://pkg.go.dev/golang.org/x/time/rate#Limit.

Burst and ExpiresIn will be set to default values.

Note that if the provided rate is a float number and Burst is zero, Burst will be treated as the rounded down value of the rate.

Example (with 20 requests/sec):

limiterStore := middleware.NewRateLimiterMemoryStore(20)

func NewRateLimiterMemoryStoreWithConfig added in v4.2.0

func NewRateLimiterMemoryStoreWithConfig(config RateLimiterMemoryStoreConfig) (store *RateLimiterMemoryStore)

NewRateLimiterMemoryStoreWithConfig returns an instance of RateLimiterMemoryStore with the provided configuration. Rate must be provided. Burst will be set to the rounded down value of the configured rate if not provided or set to 0.

The build-in memory store is usually capable for modest loads. For higher loads other store implementations should be considered.

Characteristics: * Concurrency above 100 parallel requests may causes measurable lock contention * A high number of different IP addresses (above 16000) may be impacted by the internally used Go map * A high number of requests from a single IP address may cause lock contention

Example:

limiterStore := middleware.NewRateLimiterMemoryStoreWithConfig(
	middleware.RateLimiterMemoryStoreConfig{Rate: 50, Burst: 200, ExpiresIn: 5 * time.Minute},
)

func (*RateLimiterMemoryStore) Allow added in v4.2.0

func (store *RateLimiterMemoryStore) Allow(identifier string) (bool, error)

Allow implements RateLimiterStore.Allow

type RateLimiterMemoryStoreConfig added in v4.2.0

type RateLimiterMemoryStoreConfig struct {
	Rate      rate.Limit    // Rate of requests allowed to pass as req/s. For more info check out Limiter docs - https://pkg.go.dev/golang.org/x/time/rate#Limit.
	Burst     int           // Burst is maximum number of requests to pass at the same moment. It additionally allows a number of requests to pass when rate limit is reached.
	ExpiresIn time.Duration // ExpiresIn is the duration after that a rate limiter is cleaned up
}

RateLimiterMemoryStoreConfig represents configuration for RateLimiterMemoryStore

type RateLimiterStore added in v4.2.0

type RateLimiterStore interface {
	// Stores for the rate limiter have to implement the Allow method
	Allow(identifier string) (bool, error)
}

RateLimiterStore is the interface to be implemented by custom stores.

type RecoverConfig

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

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

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

	// LogLevel is log level to printing stack trace.
	// Optional. Default value 0 (Print).
	LogLevel log.Lvl

	// LogErrorFunc defines a function for custom logging in the middleware.
	// If it's set you don't need to provide LogLevel for config.
	// If this function returns nil, the centralized HTTPErrorHandler will not be called.
	LogErrorFunc LogErrorFunc

	// DisableErrorHandler disables the call to centralized HTTPErrorHandler.
	// The recovered error is then passed back to upstream middleware, instead of swallowing the error.
	// Optional. Default value false.
	DisableErrorHandler bool `yaml:"disable_error_handler"`
}

RecoverConfig defines the config for Recover middleware.

type RedirectConfig

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

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

RedirectConfig defines the config for Redirect middleware.

type RequestIDConfig

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

	// Generator defines a function to generate an ID.
	// Optional. Defaults to generator for random string of length 32.
	Generator func() string

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

	// TargetHeader defines what header to look for to populate the id
	TargetHeader string
}

RequestIDConfig defines the config for RequestID middleware.

type RequestLoggerConfig added in v4.6.0

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

	// BeforeNextFunc defines a function that is called before next middleware or handler is called in chain.
	BeforeNextFunc func(c echo.Context)
	// LogValuesFunc defines a function that is called with values extracted by logger from request/response.
	// Mandatory.
	LogValuesFunc func(c echo.Context, v RequestLoggerValues) error

	// HandleError instructs logger to call global error handler when next middleware/handler returns an error.
	// This is useful when you have custom error handler that can decide to use different status codes.
	//
	// A side-effect of calling global error handler is that now Response has been committed and sent to the client
	// and middlewares up in chain can not change Response status code or response body.
	HandleError bool

	// LogLatency instructs logger to record duration it took to execute rest of the handler chain (next(c) call).
	LogLatency bool
	// LogProtocol instructs logger to extract request protocol (i.e. `HTTP/1.1` or `HTTP/2`)
	LogProtocol bool
	// LogRemoteIP instructs logger to extract request remote IP. See `echo.Context.RealIP()` for implementation details.
	LogRemoteIP bool
	// LogHost instructs logger to extract request host value (i.e. `example.com`)
	LogHost bool
	// LogMethod instructs logger to extract request method value (i.e. `GET` etc)
	LogMethod bool
	// LogURI instructs logger to extract request URI (i.e. `/list?lang=en&page=1`)
	LogURI bool
	// LogURIPath instructs logger to extract request URI path part (i.e. `/list`)
	LogURIPath bool
	// LogRoutePath instructs logger to extract route path part to which request was matched to (i.e. `/user/:id`)
	LogRoutePath bool
	// LogRequestID instructs logger to extract request ID from request `X-Request-ID` header or response if request did not have value.
	LogRequestID bool
	// LogReferer instructs logger to extract request referer values.
	LogReferer bool
	// LogUserAgent instructs logger to extract request user agent values.
	LogUserAgent bool
	// LogStatus instructs logger to extract response status code. If handler chain returns an echo.HTTPError,
	// the status code is extracted from the echo.HTTPError returned
	LogStatus bool
	// LogError instructs logger to extract error returned from executed handler chain.
	LogError bool
	// LogContentLength instructs logger to extract content length header value. Note: this value could be different from
	// actual request body size as it could be spoofed etc.
	LogContentLength bool
	// LogResponseSize instructs logger to extract response content length value. Note: when used with Gzip middleware
	// this value may not be always correct.
	LogResponseSize bool
	// LogHeaders instructs logger to extract given list of headers from request. Note: request can contain more than
	// one header with same value so slice of values is been logger for each given header.
	//
	// Note: header values are converted to canonical form with http.CanonicalHeaderKey as this how request parser converts header
	// names to. For example, the canonical key for "accept-encoding" is "Accept-Encoding".
	LogHeaders []string
	// LogQueryParams instructs logger to extract given list of query parameters from request URI. Note: request can
	// contain more than one query parameter with same name so slice of values is been logger for each given query param name.
	LogQueryParams []string
	// LogFormValues instructs logger to extract given list of form values from request body+URI. Note: request can
	// contain more than one form value with same name so slice of values is been logger for each given form value name.
	LogFormValues []string
	// contains filtered or unexported fields
}

RequestLoggerConfig is configuration for Request Logger middleware.

func (RequestLoggerConfig) ToMiddleware added in v4.6.0

func (config RequestLoggerConfig) ToMiddleware() (echo.MiddlewareFunc, error)

ToMiddleware converts RequestLoggerConfig into middleware or returns an error for invalid configuration.

type RequestLoggerValues added in v4.6.0

type RequestLoggerValues struct {
	// StartTime is time recorded before next middleware/handler is executed.
	StartTime time.Time
	// Latency is duration it took to execute rest of the handler chain (next(c) call).
	Latency time.Duration
	// Protocol is request protocol (i.e. `HTTP/1.1` or `HTTP/2`)
	Protocol string
	// RemoteIP is request remote IP. See `echo.Context.RealIP()` for implementation details.
	RemoteIP string
	// Host is request host value (i.e. `example.com`)
	Host string
	// Method is request method value (i.e. `GET` etc)
	Method string
	// URI is request URI (i.e. `/list?lang=en&page=1`)
	URI string
	// URIPath is request URI path part (i.e. `/list`)
	URIPath string
	// RoutePath is route path part to which request was matched to (i.e. `/user/:id`)
	RoutePath string
	// RequestID is request ID from request `X-Request-ID` header or response if request did not have value.
	RequestID string
	// Referer is request referer values.
	Referer string
	// UserAgent is request user agent values.
	UserAgent string
	// Status is response status code. Then handler returns an echo.HTTPError then code from there.
	Status int
	// Error is error returned from executed handler chain.
	Error error
	// ContentLength is content length header value. Note: this value could be different from actual request body size
	// as it could be spoofed etc.
	ContentLength string
	// ResponseSize is response content length value. Note: when used with Gzip middleware this value may not be always correct.
	ResponseSize int64
	// Headers are list of headers from request. Note: request can contain more than one header with same value so slice
	// of values is been logger for each given header.
	// Note: header values are converted to canonical form with http.CanonicalHeaderKey as this how request parser converts header
	// names to. For example, the canonical key for "accept-encoding" is "Accept-Encoding".
	Headers map[string][]string
	// QueryParams are list of query parameters from request URI. Note: request can contain more than one query parameter
	// with same name so slice of values is been logger for each given query param name.
	QueryParams map[string][]string
	// FormValues are list of form values from request body+URI. Note: request can contain more than one form value with
	// same name so slice of values is been logger for each given form value name.
	FormValues map[string][]string
}

RequestLoggerValues contains extracted values from logger.

type RewriteConfig

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

	// 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",
	// Required.
	Rules map[string]string `yaml:"rules"`

	// RegexRules defines the URL path rewrite rules using regexp.Rexexp with captures
	// Every capture group in the values can be retrieved by index e.g. $1, $2 and so on.
	// Example:
	// "^/old/[0.9]+/":     "/new",
	// "^/api/.+?/(.*)":     "/v2/$1",
	RegexRules map[*regexp.Regexp]string `yaml:"-"`
}

RewriteConfig defines the config for Rewrite middleware.

type SecureConfig

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

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

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

	// CSPReportOnly would use the `Content-Security-Policy-Report-Only` header instead
	// of the `Content-Security-Policy` header. This allows iterative updates of the
	// content security policy by only reporting the violations that would
	// have occurred instead of blocking the resource.
	// Optional. Default value false.
	CSPReportOnly bool `yaml:"csp_report_only"`

	// HSTSPreloadEnabled will add the preload tag in the `Strict Transport Security`
	// header, which enables the domain to be included in the HSTS preload list
	// maintained by Chrome (and used by Firefox and Safari): https://hstspreload.org/
	// Optional.  Default value false.
	HSTSPreloadEnabled bool `yaml:"hsts_preload_enabled"`

	// ReferrerPolicy sets the `Referrer-Policy` header providing security against
	// leaking potentially sensitive request paths to third parties.
	// Optional. Default value "".
	ReferrerPolicy string `yaml:"referrer_policy"`
}

SecureConfig defines the config for Secure middleware.

type Skipper

type Skipper func(c echo.Context) bool

Skipper defines a function to skip middleware. Returning true skips processing the middleware.

type StaticConfig

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

	// Root directory from where the static content is served.
	// Required.
	Root string `yaml:"root"`

	// Index file for serving a directory.
	// Optional. Default value "index.html".
	Index string `yaml:"index"`

	// Enable HTML5 mode by forwarding all not-found requests to root so that
	// SPA (single-page application) can handle the routing.
	// Optional. Default value false.
	HTML5 bool `yaml:"html5"`

	// Enable directory browsing.
	// Optional. Default value false.
	Browse bool `yaml:"browse"`

	// Enable ignoring of the base of the URL path.
	// Example: when assigning a static middleware to a non root path group,
	// the filesystem path is not doubled
	// Optional. Default value false.
	IgnoreBase bool `yaml:"ignoreBase"`

	// Filesystem provides access to the static content.
	// Optional. Defaults to http.Dir(config.Root)
	Filesystem http.FileSystem `yaml:"-"`
}

StaticConfig defines the config for Static middleware.

type TargetProvider added in v4.10.0

type TargetProvider interface {
	NextTarget(echo.Context) (*ProxyTarget, error)
}

TargetProvider defines an interface that gives the opportunity for balancer to return custom errors when selecting target.

type TimeoutConfig added in v4.2.0

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

	// ErrorMessage is written to response on timeout in addition to http.StatusServiceUnavailable (503) status code
	// It can be used to define a custom timeout error message
	ErrorMessage string

	// OnTimeoutRouteErrorHandler is an error handler that is executed for error that was returned from wrapped route after
	// request timeouted and we already had sent the error code (503) and message response to the client.
	// NB: do not write headers/body inside this handler. The response has already been sent to the client and response writer
	// will not accept anything no more. If you want to know what actual route middleware timeouted use `c.Path()`
	OnTimeoutRouteErrorHandler func(err error, c echo.Context)

	// Timeout configures a timeout for the middleware, defaults to 0 for no timeout
	// NOTE: when difference between timeout duration and handler execution time is almost the same (in range of 100microseconds)
	// the result of timeout does not seem to be reliable - could respond timeout, could respond handler output
	// difference over 500microseconds (0.5millisecond) response seems to be reliable
	Timeout time.Duration
}

TimeoutConfig defines the config for Timeout middleware.

func (TimeoutConfig) ToMiddleware added in v4.7.2

func (config TimeoutConfig) ToMiddleware() (echo.MiddlewareFunc, error)

ToMiddleware converts Config to middleware or returns an error for invalid configuration

type TrailingSlashConfig

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

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

TrailingSlashConfig defines the config for TrailingSlash middleware.

type ValuesExtractor added in v4.7.0

type ValuesExtractor func(c echo.Context) ([]string, error)

ValuesExtractor defines a function for extracting values (keys/tokens) from the given context.

func CreateExtractors added in v4.10.0

func CreateExtractors(lookups string) ([]ValuesExtractor, error)

CreateExtractors creates ValuesExtractors from given lookups. Lookups is a string in the form of "<source>:<name>" or "<source>:<name>,<source>:<name>" that is used to extract key from the request. Possible values:

  • "header:<name>" or "header:<name>:<cut-prefix>" `<cut-prefix>` is argument value to cut/trim prefix of the extracted value. This is useful if header value has static prefix like `Authorization: <auth-scheme> <authorisation-parameters>` where part that we want to cut is `<auth-scheme> ` note the space at the end. In case of basic authentication `Authorization: Basic <credentials>` prefix we want to remove is `Basic `.
  • "query:<name>"
  • "param:<name>"
  • "form:<name>"
  • "cookie:<name>"

Multiple sources example: - "header:Authorization,header:X-Api-Key"

type Visitor added in v4.2.0

type Visitor struct {
	*rate.Limiter
	// contains filtered or unexported fields
}

Visitor signifies a unique user's limiter details

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