plugins/link_handler.go (view raw)
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package plugins import ( "errors" "fmt" "io" "log" "net/http" "net/url" "strings" "golang.org/x/net/html" "gopkg.in/irc.v3" ) // This plugin is an example of how to make something that will // respond (or just have read access to) every message that comes in. // The plugins.go file has a special case for handling an 'empty' Triggers string. // on such a case, it will simply run Execute on every message that it sees. func init() { Register(LinkHandler{}) } type LinkHandler struct{} func (LinkHandler) Triggers() []string { return []string{""} } func (LinkHandler) Execute(m *irc.Message) (string, error) { // The message starts with a '.', so we ignore it. if strings.HasPrefix(m.Params[1], ".") { return "", NoReply } var output strings.Builder // in PRIVMSG's case, the second (first, if counting from 0) parameter // is the string that contains the complete message. for _, value := range strings.Split(m.Params[1], " ") { u, err := url.Parse(value) if err != nil { continue } // just a test check for the time being. // this if statement block will be used for content that is // non-generic. I.e it belongs to a specific website, like // stackoverflow or youtube. if u.Hostname() == "www.youtube.com" || u.Hostname() == "youtube.com" || u.Hostname() == "youtu.be" { // TODO finish this yt, err := YoutubeDescriptionFromUrl(u) if err != nil { return "", err } output.WriteString(yt) output.WriteByte('\n') } else if len(u.Hostname()) > 0 { desc, err := getDescriptionFromURL(value) if err != nil { log.Printf("Failed to get title from http URL") fmt.Println(err) continue } output.WriteString(fmt.Sprintf("[URL] %s (%s)\n", desc, u.Hostname())) } } if output.Len() > 0 { return output.String(), nil } else { return "", NoReply // We need to NoReply so we don't consume all messages. } } // the three funcs below are taken from: // https://siongui.github.io/2016/05/10/go-get-html-title-via-net-html/ func isTitleElement(n *html.Node) bool { return n.Type == html.ElementNode && n.Data == "title" } func traverse(n *html.Node) (string, bool) { if isTitleElement(n) { return n.FirstChild.Data, true } for c := n.FirstChild; c != nil; c = c.NextSibling { result, ok := traverse(c) if ok { return result, ok } } return "", false } func getHtmlTitle(r io.Reader) (string, bool) { doc, err := html.Parse(r) if err != nil { return "", false } return traverse(doc) } // yoinkies from // https://yourbasic.org/golang/formatting-byte-size-to-human-readable-format/ func byteCountSI(b int64) string { const unit = 1000 if b < unit { return fmt.Sprintf("%d B", b) } div, exp := int64(unit), 0 for n := b / unit; n >= unit; n /= unit { div *= unit exp++ } return fmt.Sprintf("%.1f %cB", float64(b)/float64(div), "kMGTPE"[exp]) } // provides a basic, short description of whatever is inside // a posted URL. func getDescriptionFromURL(url string) (string, error) { resp, err := http.Get(url) if err != nil { return "", err } defer resp.Body.Close() mime := resp.Header.Get("content-type") switch mime { case "image/jpeg": return fmt.Sprintf("JPEG image, size: %s", byteCountSI(resp.ContentLength)), nil case "image/png": return fmt.Sprintf("PNG image, size: %s", byteCountSI(resp.ContentLength)), nil default: output, ok := getHtmlTitle(resp.Body) if !ok { return "", errors.New("Failed to find <title> in html") } return output, nil } } |