inject

Documentation

Overview

Package inject gives the ability to copy data and inject a payload before a specified marker. In order to let the user respond to the change in length, the API is split into two parts - Sniff checks whether the marker occurs within a specified number of initial bytes, and Copy sends the data to the destination.

The package tries to avoid double-injecting a payload by checking whether the payload occurs within the first Within + len(Payload) bytes.

Index

• type CopyInject
  • func (ci *CopyInject) ServeTemplate(statuscode int, w http.ResponseWriter, t *template.Template, data interface{}) error
  • func (ci *CopyInject) Sniff(src io.Reader, contentType string) (Injector, error)
• type Injector

Types

type CopyInject

type CopyInject struct {
	// Number of initial bytes within which to search for marker
	Within int
	// Only inject in responses with this content type
	ContentType string
	// A marker, BEFORE which the payload is inserted
	Marker *regexp.Regexp
	// The payload to be inserted
	Payload []byte
}

CopyInject copies data, and injects a payload before a specified marker

func (*CopyInject) ServeTemplate

func (ci *CopyInject) ServeTemplate(statuscode int, w http.ResponseWriter, t *template.Template, data interface{}) error

ServeTemplate renders and serves a template to an http.ResponseWriter

func (*CopyInject) Sniff

func (ci *CopyInject) Sniff(src io.Reader, contentType string) (Injector, error)

Sniff reads the first SniffLen bytes of the source, and checks for the marker. Returns an Injector instance.

type Injector

type Injector interface {
	Copy(dst io.Writer) (int64, error)
	Extra() int
	Found() bool
}