maphandler

Documentation

Index

• type Handler
  • func (Handler) CaddyModule() caddy.ModuleInfo
  • func (h *Handler) Provision(_ caddy.Context) error
  • func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error
  • func (h *Handler) Validate() error
• type Mapping

Types

type Handler

type Handler struct {
	// Source is the placeholder from which to get the input value.
	Source string `json:"source,omitempty"`

	// Destinations are the names of placeholders in which to store the outputs.
	Destinations []string `json:"destinations,omitempty"`

	// Mappings from source values (inputs) to destination values (outputs).
	// The first matching, non-nil mapping will be applied.
	Mappings []Mapping `json:"mappings,omitempty"`

	// If no mappings match or if the mapped output is null/nil, the associated
	// default output will be applied (optional).
	Defaults []string
}

Handler implements a middleware that maps inputs to outputs. Specifically, it compares a source value against the map inputs, and for one that matches, it applies the output values to each destination. Destinations become placeholder names.

Mapped placeholders are not evaluated until they are used, so even for very large mappings, this handler is quite efficient.

func (Handler) CaddyModule

func (Handler) CaddyModule() caddy.ModuleInfo

CaddyModule returns the Caddy module information.

func (*Handler) Provision

func (h *Handler) Provision(_ caddy.Context) error

Provision sets up h.

func (Handler) ServeHTTP

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

func (*Handler) Validate

func (h *Handler) Validate() error

Validate ensures that h is configured properly.

type Mapping

type Mapping struct {
	// The input value to match. Must be distinct from other mappings.
	// Mutually exclusive to input_regexp.
	Input string `json:"input,omitempty"`

	// The input regular expression to match. Mutually exclusive to input.
	InputRegexp string `json:"input_regexp,omitempty"`

	// Upon a match with the input, each output is positionally correlated
	// with each destination of the parent handler. An output that is null
	// (nil) will be treated as if it was not mapped at all.
	Outputs []interface{} `json:"outputs,omitempty"`
	// contains filtered or unexported fields
}

Mapping describes a mapping from input to outputs.