363 lines
10 KiB
Go
363 lines
10 KiB
Go
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package opengraph
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import (
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"encoding/json"
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"io"
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"strconv"
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"time"
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"golang.org/x/net/html"
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"golang.org/x/net/html/atom"
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)
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// Image defines Open Graph Image type
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type Image struct {
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URL string `json:"url"`
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SecureURL string `json:"secure_url"`
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Type string `json:"type"`
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Width uint64 `json:"width"`
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Height uint64 `json:"height"`
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draft bool `json:"-"`
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}
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// Video defines Open Graph Video type
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type Video struct {
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URL string `json:"url"`
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SecureURL string `json:"secure_url"`
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Type string `json:"type"`
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Width uint64 `json:"width"`
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Height uint64 `json:"height"`
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draft bool `json:"-"`
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}
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// Audio defines Open Graph Audio Type
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type Audio struct {
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URL string `json:"url"`
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SecureURL string `json:"secure_url"`
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Type string `json:"type"`
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draft bool `json:"-"`
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}
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// Article contain Open Graph Article structure
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type Article struct {
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PublishedTime *time.Time `json:"published_time"`
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ModifiedTime *time.Time `json:"modified_time"`
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ExpirationTime *time.Time `json:"expiration_time"`
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Section string `json:"section"`
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Tags []string `json:"tags"`
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Authors []*Profile `json:"authors"`
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}
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// Profile contains Open Graph Profile structure
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type Profile struct {
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FirstName string `json:"first_name"`
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LastName string `json:"last_name"`
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Username string `json:"username"`
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Gender string `json:"gender"`
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}
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// Book contains Open Graph Book structure
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type Book struct {
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ISBN string `json:"isbn"`
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ReleaseDate *time.Time `json:"release_date"`
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Tags []string `json:"tags"`
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Authors []*Profile `json:"authors"`
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}
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// OpenGraph contains facebook og data
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type OpenGraph struct {
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isArticle bool
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isBook bool
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isProfile bool
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Type string `json:"type"`
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URL string `json:"url"`
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Title string `json:"title"`
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Description string `json:"description"`
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Determiner string `json:"determiner"`
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SiteName string `json:"site_name"`
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Locale string `json:"locale"`
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LocalesAlternate []string `json:"locales_alternate"`
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Images []*Image `json:"images"`
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Audios []*Audio `json:"audios"`
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Videos []*Video `json:"videos"`
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Article *Article `json:"article,omitempty"`
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Book *Book `json:"book,omitempty"`
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Profile *Profile `json:"profile,omitempty"`
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}
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// NewOpenGraph returns new instance of Open Graph structure
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func NewOpenGraph() *OpenGraph {
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return &OpenGraph{}
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}
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// ToJSON a simple wrapper around json.Marshal
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func (og *OpenGraph) ToJSON() ([]byte, error) {
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return json.Marshal(og)
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}
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// String return json representation of structure, or error string
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func (og *OpenGraph) String() string {
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data, err := og.ToJSON()
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if err != nil {
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return err.Error()
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}
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return string(data[:])
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}
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// ProcessHTML parses given html from Reader interface and fills up OpenGraph structure
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func (og *OpenGraph) ProcessHTML(buffer io.Reader) error {
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z := html.NewTokenizer(buffer)
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for {
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tt := z.Next()
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switch tt {
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case html.ErrorToken:
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if z.Err() == io.EOF {
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return nil
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}
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return z.Err()
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case html.StartTagToken, html.SelfClosingTagToken, html.EndTagToken:
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name, hasAttr := z.TagName()
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if atom.Lookup(name) != atom.Meta || !hasAttr {
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continue
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}
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m := make(map[string]string)
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var key, val []byte
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for hasAttr {
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key, val, hasAttr = z.TagAttr()
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m[atom.String(key)] = string(val)
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}
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og.ProcessMeta(m)
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}
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}
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}
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func (og *OpenGraph) ensureHasVideo() {
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if len(og.Videos) > 0 {
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return
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}
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og.Videos = append(og.Videos, &Video{draft: true})
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}
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func (og *OpenGraph) ensureHasImage() {
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if len(og.Images) > 0 {
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return
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}
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og.Images = append(og.Images, &Image{draft: true})
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}
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func (og *OpenGraph) ensureHasAudio() {
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if len(og.Audios) > 0 {
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return
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}
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og.Audios = append(og.Audios, &Audio{draft: true})
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}
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// ProcessMeta processes meta attributes and adds them to Open Graph structure if they are suitable for that
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func (og *OpenGraph) ProcessMeta(metaAttrs map[string]string) {
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switch metaAttrs["property"] {
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case "og:description":
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og.Description = metaAttrs["content"]
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case "og:type":
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og.Type = metaAttrs["content"]
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switch og.Type {
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case "article":
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og.isArticle = true
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case "book":
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og.isBook = true
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case "profile":
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og.isProfile = true
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}
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case "og:title":
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og.Title = metaAttrs["content"]
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case "og:url":
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og.URL = metaAttrs["content"]
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case "og:determiner":
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og.Determiner = metaAttrs["content"]
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case "og:site_name":
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og.SiteName = metaAttrs["content"]
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case "og:locale":
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og.Locale = metaAttrs["content"]
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case "og:locale:alternate":
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og.LocalesAlternate = append(og.LocalesAlternate, metaAttrs["content"])
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case "og:audio":
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if len(og.Audios)>0 && og.Audios[len(og.Audios)-1].draft {
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og.Audios[len(og.Audios)-1].URL = metaAttrs["content"]
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og.Audios[len(og.Audios)-1].draft = false
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} else {
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og.Audios = append(og.Audios, &Audio{URL: metaAttrs["content"]})
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}
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case "og:audio:secure_url":
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og.ensureHasAudio()
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og.Audios[len(og.Audios)-1].SecureURL = metaAttrs["content"]
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case "og:audio:type":
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og.ensureHasAudio()
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og.Audios[len(og.Audios)-1].Type = metaAttrs["content"]
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case "og:image":
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if len(og.Images)>0 && og.Images[len(og.Images)-1].draft {
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og.Images[len(og.Images)-1].URL = metaAttrs["content"]
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og.Images[len(og.Images)-1].draft = false
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} else {
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og.Images = append(og.Images, &Image{URL: metaAttrs["content"]})
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}
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case "og:image:url":
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og.ensureHasImage()
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og.Images[len(og.Images)-1].URL = metaAttrs["content"]
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case "og:image:secure_url":
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og.ensureHasImage()
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og.Images[len(og.Images)-1].SecureURL = metaAttrs["content"]
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case "og:image:type":
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og.ensureHasImage()
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og.Images[len(og.Images)-1].Type = metaAttrs["content"]
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case "og:image:width":
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w, err := strconv.ParseUint(metaAttrs["content"], 10, 64)
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if err == nil {
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og.ensureHasImage()
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og.Images[len(og.Images)-1].Width = w
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}
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case "og:image:height":
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h, err := strconv.ParseUint(metaAttrs["content"], 10, 64)
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if err == nil {
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og.ensureHasImage()
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og.Images[len(og.Images)-1].Height = h
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}
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case "og:video":
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if len(og.Videos)>0 && og.Videos[len(og.Videos)-1].draft {
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og.Videos[len(og.Videos)-1].URL = metaAttrs["content"]
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og.Videos[len(og.Videos)-1].draft = false
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} else {
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og.Videos = append(og.Videos, &Video{URL: metaAttrs["content"]})
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}
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case "og:video:url":
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og.ensureHasVideo()
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og.Videos[len(og.Videos)-1].URL = metaAttrs["content"]
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case "og:video:secure_url":
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og.ensureHasVideo()
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og.Videos[len(og.Videos)-1].SecureURL = metaAttrs["content"]
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case "og:video:type":
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og.ensureHasVideo()
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og.Videos[len(og.Videos)-1].Type = metaAttrs["content"]
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case "og:video:width":
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w, err := strconv.ParseUint(metaAttrs["content"], 10, 64)
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if err == nil {
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og.ensureHasVideo()
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og.Videos[len(og.Videos)-1].Width = w
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}
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case "og:video:height":
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h, err := strconv.ParseUint(metaAttrs["content"], 10, 64)
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if err == nil {
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og.ensureHasVideo()
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og.Videos[len(og.Videos)-1].Height = h
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}
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default:
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if og.isArticle {
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og.processArticleMeta(metaAttrs)
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} else if og.isBook {
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og.processBookMeta(metaAttrs)
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} else if og.isProfile {
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og.processProfileMeta(metaAttrs)
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}
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}
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}
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func (og *OpenGraph) processArticleMeta(metaAttrs map[string]string) {
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if og.Article == nil {
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og.Article = &Article{}
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}
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switch metaAttrs["property"] {
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case "article:published_time":
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t, err := time.Parse(time.RFC3339, metaAttrs["content"])
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if err == nil {
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og.Article.PublishedTime = &t
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}
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case "article:modified_time":
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t, err := time.Parse(time.RFC3339, metaAttrs["content"])
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if err == nil {
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og.Article.ModifiedTime = &t
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}
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case "article:expiration_time":
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t, err := time.Parse(time.RFC3339, metaAttrs["content"])
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if err == nil {
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og.Article.ExpirationTime = &t
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}
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case "article:section":
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og.Article.Section = metaAttrs["content"]
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case "article:tag":
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og.Article.Tags = append(og.Article.Tags, metaAttrs["content"])
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case "article:author:first_name":
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if len(og.Article.Authors) == 0 {
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og.Article.Authors = append(og.Article.Authors, &Profile{})
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}
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og.Article.Authors[len(og.Article.Authors)-1].FirstName = metaAttrs["content"]
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case "article:author:last_name":
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if len(og.Article.Authors) == 0 {
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og.Article.Authors = append(og.Article.Authors, &Profile{})
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}
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og.Article.Authors[len(og.Article.Authors)-1].LastName = metaAttrs["content"]
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case "article:author:username":
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if len(og.Article.Authors) == 0 {
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og.Article.Authors = append(og.Article.Authors, &Profile{})
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}
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og.Article.Authors[len(og.Article.Authors)-1].Username = metaAttrs["content"]
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case "article:author:gender":
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if len(og.Article.Authors) == 0 {
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og.Article.Authors = append(og.Article.Authors, &Profile{})
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}
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og.Article.Authors[len(og.Article.Authors)-1].Gender = metaAttrs["content"]
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}
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}
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func (og *OpenGraph) processBookMeta(metaAttrs map[string]string) {
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if og.Book == nil {
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og.Book = &Book{}
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}
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switch metaAttrs["property"] {
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case "book:release_date":
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t, err := time.Parse(time.RFC3339, metaAttrs["content"])
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if err == nil {
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og.Book.ReleaseDate = &t
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}
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case "book:isbn":
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og.Book.ISBN = metaAttrs["content"]
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case "book:tag":
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og.Book.Tags = append(og.Book.Tags, metaAttrs["content"])
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case "book:author:first_name":
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if len(og.Book.Authors) == 0 {
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og.Book.Authors = append(og.Book.Authors, &Profile{})
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}
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og.Book.Authors[len(og.Book.Authors)-1].FirstName = metaAttrs["content"]
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case "book:author:last_name":
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if len(og.Book.Authors) == 0 {
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og.Book.Authors = append(og.Book.Authors, &Profile{})
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}
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og.Book.Authors[len(og.Book.Authors)-1].LastName = metaAttrs["content"]
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case "book:author:username":
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if len(og.Book.Authors) == 0 {
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og.Book.Authors = append(og.Book.Authors, &Profile{})
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}
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og.Book.Authors[len(og.Book.Authors)-1].Username = metaAttrs["content"]
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case "book:author:gender":
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if len(og.Book.Authors) == 0 {
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og.Book.Authors = append(og.Book.Authors, &Profile{})
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}
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og.Book.Authors[len(og.Book.Authors)-1].Gender = metaAttrs["content"]
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}
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}
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func (og *OpenGraph) processProfileMeta(metaAttrs map[string]string) {
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if og.Profile == nil {
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og.Profile = &Profile{}
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}
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switch metaAttrs["property"] {
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case "profile:first_name":
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og.Profile.FirstName = metaAttrs["content"]
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case "profile:last_name":
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og.Profile.LastName = metaAttrs["content"]
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case "profile:username":
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og.Profile.Username = metaAttrs["content"]
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case "profile:gender":
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og.Profile.Gender = metaAttrs["content"]
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}
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}
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