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add OpenGraph meta tags, for image preview inside chat apps like Telegram

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This commit is contained in:
mappu 2018-06-04 17:22:28 +12:00
parent 0fbf401fd3
commit 0a338c4568
2 changed files with 26 additions and 4 deletions
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5
Server.go
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@ -17,8 +17,9 @@ import (
var SERVER_HEADER string = `contented/0.0.0-dev`
type ServerPublicProperties struct {
AppTitle string
MaxUploadBytes int64
AppTitle string
MaxUploadBytes int64
CanonicalBaseURL string
}
type ServerOptions struct {

25
preview.go
View File

@ -15,10 +15,31 @@ func (this *Server) handlePreview(w http.ResponseWriter, fileIDList string) {
fileIDs := strings.Split(fileIDList, `-`)
tmpl := `<!DOCTYPE html>
<html>
<html prefix="og: http://ogp.me/ns#">
<head>
<title>` + html.EscapeString(this.opts.ServerPublicProperties.AppTitle) + `</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta property="og:title" content="` + html.EscapeString(this.opts.ServerPublicProperties.AppTitle) + `" />
<meta property="og:site_name" content="` + html.EscapeString(this.opts.ServerPublicProperties.AppTitle) + `" />
<meta property="og:type" content="website" />
`
if len(this.opts.ServerPublicPropertyies.CanonicalBaseURL) > 0 {
tmpl += `
<meta property="og:url" content="` + html.EscapeString(this.opts.ServerPublicProperties.CanonicalBaseURL+`p/`+fileIDList) + `" />
`
}
for _, fileID := range fileIDs {
tmpl += `
<meta property="og:image" content="` + html.EscapeString(`/thumb/m/`+fileID) + `" />
<meta property="og:image:type" content="image/jpeg" />
<meta property="og:image:width" content="300" />
<meta property="og:image:height" content="300" />
`
}
tmpl += `
<style type="text/css">
html, body {
background: #333;