headers

Documentation

Index

• func KenginefileHeaderOp(ops *HeaderOps, field, value string, replacement *string) error
• type Handler
  • func (Handler) KengineModule() kengine.ModuleInfo
  • func (h *Handler) Provision(ctx kengine.Context) error
  • func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next kenginehttp.Handler) error
  • func (h Handler) Validate() error
• type HeaderOps
  • func (ops HeaderOps) ApplyTo(hdr http.Header, repl *kengine.Replacer)
  • func (ops HeaderOps) ApplyToRequest(r *http.Request)
  • func (ops *HeaderOps) Provision(_ kengine.Context) error
• type Replacement
• type RespHeaderOps

Functions

func KenginefileHeaderOp

func KenginefileHeaderOp(ops *HeaderOps, field, value string, replacement *string) error

KenginefileHeaderOp applies a new header operation according to field, value, and replacement. The field can be prefixed with "+" or "-" to specify adding or removing; otherwise, the value will be set (overriding any previous value). If replacement is non-nil, value will be treated as a regular expression which will be used to search and then replacement will be used to complete the substring replacement; in that case, any + or - prefix to field will be ignored.

Types

type Handler

type Handler struct {
	Request  *HeaderOps     `json:"request,omitempty"`
	Response *RespHeaderOps `json:"response,omitempty"`
}

Handler is a middleware which modifies request and response headers.

Changes to headers are applied immediately, except for the response headers when Deferred is true or when Required is set. In those cases, the changes are applied when the headers are written to the response. Note that deferred changes do not take effect if an error occurs later in the middleware chain.

Properties in this module accept placeholders.

Response header operations can be conditioned upon response status code and/or other header values.

func (Handler) KengineModule

func (Handler) KengineModule() kengine.ModuleInfo

KengineModule returns the Kengine module information.

func (*Handler) Provision

func (h *Handler) Provision(ctx kengine.Context) error

Provision sets up h's configuration.

func (Handler) ServeHTTP

func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next kenginehttp.Handler) error

func (Handler) Validate

func (h Handler) Validate() error

Validate ensures h's configuration is valid.

type HeaderOps

type HeaderOps struct {
	// Adds HTTP headers; does not replace any existing header fields.
	Add http.Header `json:"add,omitempty"`

	// Sets HTTP headers; replaces existing header fields.
	Set http.Header `json:"set,omitempty"`

	// Names of HTTP header fields to delete. Basic wildcards are supported:
	//
	// - Start with `*` for all field names with the given suffix;
	// - End with `*` for all field names with the given prefix;
	// - Start and end with `*` for all field names containing a substring.
	Delete []string `json:"delete,omitempty"`

	// Performs in-situ substring replacements of HTTP headers.
	// Keys are the field names on which to perform the associated replacements.
	// If the field name is `*`, the replacements are performed on all header fields.
	Replace map[string][]Replacement `json:"replace,omitempty"`
}

HeaderOps defines manipulations for HTTP headers.

func (HeaderOps) ApplyTo

func (ops HeaderOps) ApplyTo(hdr http.Header, repl *kengine.Replacer)

ApplyTo applies ops to hdr using repl.

func (HeaderOps) ApplyToRequest

func (ops HeaderOps) ApplyToRequest(r *http.Request)

ApplyToRequest applies ops to r, specially handling the Host header which the standard library does not include with the header map with all the others. This method mutates r.Host.

func (*HeaderOps) Provision

func (ops *HeaderOps) Provision(_ kengine.Context) error

Provision sets up the header operations.

type Replacement

type Replacement struct {
	// The substring to search for.
	Search string `json:"search,omitempty"`

	// The regular expression to search with.
	SearchRegexp string `json:"search_regexp,omitempty"`

	// The string with which to replace matches.
	Replace string `json:"replace,omitempty"`
	// contains filtered or unexported fields
}

Replacement describes a string replacement, either a simple and fast substring search or a slower but more powerful regex search.

type RespHeaderOps

type RespHeaderOps struct {
	*HeaderOps

	// If set, header operations will be deferred until
	// they are written out and only performed if the
	// response matches these criteria.
	Require *kenginehttp.ResponseMatcher `json:"require,omitempty"`

	// If true, header operations will be deferred until
	// they are written out. Superseded if Require is set.
	// Usually you will need to set this to true if any
	// fields are being deleted.
	Deferred bool `json:"deferred,omitempty"`
}

RespHeaderOps defines manipulations for response headers.