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Added support for preview links #2184 #2187

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Added support for preview links #2184 #2187

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3 changes: 3 additions & 0 deletions conf.go
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,9 @@ type ServerConf struct {
ForwardedHeaders map[string]bool
KeepAppLive bool
PingInterval time.Duration
PreviewImage string
PreviewTitle string
PreviewDescription string
Comment on lines +55 to +57
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Make these part of the https://github.com/h2oai/wave/blob/94bf37f538719ad279a41b0df1b452623d61aaa4/conf.go#L71C7-L71C7 as well to expose new options to the users.

Also document here.

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I'll get started on this as well as a demo :)

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Hi Martin,

I started working on the demo. Using Meta's Open Graph debugger, it can read the custom title and description, but there are some issues with the image.
image
image

I did some more digging and there are some guidelines for adding images to preview links
https://developers.facebook.com/docs/sharing/best-practices/#precaching

How should I approach this?

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The warning says all it needs are og:image:height and og:image:width props. I would first try it out to see if they help. If they do, the next step would be to validate passed image dimensions and:

  • If the image does not adhere to the recommended ratio or is too small, log warning and use the actual dimensions for the respective props.
  • If the image ratio is good and >= required dimensions, use the copy of the image resized to the expected dimensions.

Hope that makes sense.

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Yes that makes sense I'll get started on it!

}

type AuthConf struct {
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2 changes: 1 addition & 1 deletion server.go
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Expand Up @@ -140,7 +140,7 @@ func Run(conf ServerConf) {
}))
}

webServer, err := newWebServer(site, broker, auth, conf.Keychain, conf.MaxRequestSize, conf.BaseURL, conf.WebDir, conf.Header)
webServer, err := newWebServer(site, broker, auth, conf.Keychain, conf.MaxRequestSize, conf.BaseURL, conf.WebDir, conf.Header, conf.PreviewImage, conf.PreviewTitle, conf.PreviewDescription)
if err != nil {
panic(err)
}
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13 changes: 11 additions & 2 deletions web_server.go
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Expand Up @@ -50,6 +50,9 @@ func newWebServer(
baseURL string,
webDir string,
header http.Header,
previewImage string,
previewTitle string,
previewDescription string,
) (*WebServer, error) {

// read default index.html page from the web root
Expand All @@ -58,15 +61,21 @@ func newWebServer(
return nil, fmt.Errorf("failed reading default index.html page: %v", err)
}

fs := handleStatic([]byte(mungeIndexPage(baseURL, string(indexPage))), http.StripPrefix(baseURL, http.FileServer(http.Dir(webDir))), header)
fs := handleStatic([]byte(mungeIndexPage(baseURL, string(indexPage), previewImage, previewTitle, previewDescription)), http.StripPrefix(baseURL, http.FileServer(http.Dir(webDir))), header)
if auth != nil {
fs = auth.wrap(fs)
}
return &WebServer{site, broker, fs, keychain, maxRequestSize, baseURL}, nil
}

func mungeIndexPage(baseURL, html string) string {
func mungeIndexPage(baseURL, html string, previewImage string, previewTitle string, previewDescription string) string {
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nit: Should be enough.

Suggested change
func mungeIndexPage(baseURL, html string, previewImage string, previewTitle string, previewDescription string) string {
func mungeIndexPage(baseURL, html, previewImage, previewTitle, previewDescription string) string {

// HACK
// add meta tags for preview image, title, description to the html string
metaTags := fmt.Sprintf(`<meta property="og:image" content="%s">
<meta property="og:title" content="%s">
<meta property="og:description" content="%s">`, previewImage, previewTitle, previewDescription)
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html = strings.Replace(html, "<head>", "<head>"+metaTags, 1)

// set base URL as a body tag attribute, to be used by the front-end for deducing hash-routing and websocket addresses.
html = strings.Replace(html, "<body", `<body data-base-url="`+baseURL+`"`, 1)
// ./wave-static/a/b/c.d -> /base-url/wave-static/a/b/c.d
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