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| 1 | +package noembed |
| 2 | + |
| 3 | +import ( |
| 4 | + "encoding/json" |
| 5 | + "errors" |
| 6 | + "io" |
| 7 | + "io/ioutil" |
| 8 | + "net/http" |
| 9 | + "regexp" |
| 10 | + "strings" |
| 11 | +) |
| 12 | + |
| 13 | +var noembedURL = "https://noembed.com/embed?url={url}" |
| 14 | + |
| 15 | +// NoEmbed represents this package |
| 16 | +type NoEmbed struct { |
| 17 | + data *Data |
| 18 | +} |
| 19 | + |
| 20 | +// Data represents the data for noembed providers |
| 21 | +type Data []struct { |
| 22 | + Name string `json:"name"` |
| 23 | + Patterns []Regex `json:"patterns"` |
| 24 | +} |
| 25 | + |
| 26 | +// Response represents the data returned by noembed server |
| 27 | +type Response struct { |
| 28 | + AuthorName string `json:"author_name"` |
| 29 | + AuthorURL string `json:"author_url"` |
| 30 | + ProviderName string `json:"provider_name"` |
| 31 | + ProviderURL string `json:"provider_url"` |
| 32 | + Title string `json:"title"` |
| 33 | + Type string `json:"type"` |
| 34 | + URL string `json:"url"` |
| 35 | + HTML string `json:"html"` |
| 36 | + Version string `json:"version"` |
| 37 | + ThumbnailURL string `json:"thumbnail_url"` |
| 38 | + ThumbnailWidth int `json:"thumbnail_width,string"` |
| 39 | + ThumbnailHeight int `json:"thumbnail_height,string"` |
| 40 | + Width int `json:"width,string"` |
| 41 | + Height int `json:"height,string"` |
| 42 | +} |
| 43 | + |
| 44 | +// New returns a Noembed object |
| 45 | +func New() *NoEmbed { |
| 46 | + return &NoEmbed{} |
| 47 | +} |
| 48 | + |
| 49 | +// ParseProviders parses the raw json obtained from noembed.com |
| 50 | +func (n *NoEmbed) ParseProviders(buf io.Reader) error { |
| 51 | + data, err := ioutil.ReadAll(buf) |
| 52 | + if err != nil { |
| 53 | + return err |
| 54 | + } |
| 55 | + |
| 56 | + var noembedData Data |
| 57 | + err = json.Unmarshal(data, &noembedData) |
| 58 | + if err != nil { |
| 59 | + return err |
| 60 | + } |
| 61 | + |
| 62 | + n.data = &noembedData |
| 63 | + return nil |
| 64 | +} |
| 65 | + |
| 66 | +// Get returns a noembed response object |
| 67 | +func (n *NoEmbed) Get(url string) (resp *Response, err error) { |
| 68 | + if !n.ValidURL(url) { |
| 69 | + err = errors.New("Unsupported URL") |
| 70 | + return |
| 71 | + } |
| 72 | + |
| 73 | + reqURL := strings.Replace(noembedURL, "{url}", url, 1) |
| 74 | + |
| 75 | + var httpResp *http.Response |
| 76 | + httpResp, err = http.Get(reqURL) |
| 77 | + if err != nil { |
| 78 | + return |
| 79 | + } |
| 80 | + defer httpResp.Body.Close() |
| 81 | + |
| 82 | + var body []byte |
| 83 | + body, err = ioutil.ReadAll(httpResp.Body) |
| 84 | + if err != nil { |
| 85 | + return |
| 86 | + } |
| 87 | + |
| 88 | + err = json.Unmarshal(body, &resp) |
| 89 | + if err != nil { |
| 90 | + return |
| 91 | + } |
| 92 | + |
| 93 | + return |
| 94 | +} |
| 95 | + |
| 96 | +// ValidURL is used to test if a url is supported by noembed |
| 97 | +func (n *NoEmbed) ValidURL(url string) bool { |
| 98 | + for _, entry := range *n.data { |
| 99 | + for _, pattern := range entry.Patterns { |
| 100 | + if pattern.Regexp.MatchString(url) { |
| 101 | + return true |
| 102 | + } |
| 103 | + } |
| 104 | + } |
| 105 | + return false |
| 106 | +} |
| 107 | + |
| 108 | +// Regex Unmarshaler |
| 109 | +type Regex struct { |
| 110 | + regexp.Regexp |
| 111 | +} |
| 112 | + |
| 113 | +// UnmarshalText used to unmarshal regexp's from text |
| 114 | +func (r *Regex) UnmarshalText(text []byte) error { |
| 115 | + reg, err := regexp.Compile(string(text)) |
| 116 | + r.Regexp = *reg |
| 117 | + return err |
| 118 | +} |
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