attachment.go
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attachment.go
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	package activitystreams

	import (
	"mime"
	"strings"
	)

	type Attachment struct {
	Type AttachmentType `json:"type"`
	URL string `json:"url"`
	MediaType string `json:"mediaType"`
	Name string `json:"name"`
	}

	type AttachmentType string

	const AttachImage AttachmentType = "Image"

	// NewImageAttachment creates a new Attachment from the given URL, setting the
	// correct type and automatically detecting the MediaType based on the file
	// extension.
	func NewImageAttachment(url string) *Attachment {
	var imgType string
	extIdx := strings.LastIndexByte(url, '.')
	if extIdx > -1 {
	imgType = mime.TypeByExtension(url[extIdx:])
	}
	return &Attachment{
	Type: AttachImage,
	URL: url,
	MediaType: imgType,
	}
	}