rss-tools/app/atom/text.go (view raw)
| 1 | package atom |
| 2 | |
| 3 | import ( |
| 4 | "encoding/xml" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "strings" |
| 8 | ) |
| 9 | |
| 10 | func (t Text) MarshalXML(e *xml.Encoder, start xml.StartElement) error { |
| 11 | contentType := strings.TrimSpace(t.Type) |
| 12 | if contentType == "" { |
| 13 | contentType = "text" |
| 14 | } |
| 15 | |
| 16 | start.Attr = append(start.Attr, xml.Attr{ |
| 17 | Name: xml.Name{Local: "type"}, |
| 18 | Value: contentType, |
| 19 | }) |
| 20 | |
| 21 | if err := e.EncodeToken(start); err != nil { |
| 22 | return err |
| 23 | } |
| 24 | |
| 25 | if contentType == "xhtml" { |
| 26 | if err := validateXHTMLFragment(t.Body); err != nil { |
| 27 | return err |
| 28 | } |
| 29 | if err := e.Encode(xhtmlDiv{ |
| 30 | XMLNS: xhtmlNamespace, |
| 31 | Inner: t.Body, |
| 32 | }); err != nil { |
| 33 | return err |
| 34 | } |
| 35 | } else { |
| 36 | if err := e.EncodeToken(xml.CharData([]byte(t.Body))); err != nil { |
| 37 | return err |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | if err := e.EncodeToken(start.End()); err != nil { |
| 42 | return err |
| 43 | } |
| 44 | return e.Flush() |
| 45 | } |
| 46 | |
| 47 | type xhtmlDiv struct { |
| 48 | XMLName xml.Name `xml:"div"` |
| 49 | XMLNS string `xml:"xmlns,attr"` |
| 50 | Inner string `xml:",innerxml"` |
| 51 | } |
| 52 | |
| 53 | func validateXHTMLFragment(fragment string) error { |
| 54 | wrapped := fmt.Sprintf(`<div xmlns="%s">%s</div>`, xhtmlNamespace, fragment) |
| 55 | dec := xml.NewDecoder(strings.NewReader(wrapped)) |
| 56 | for { |
| 57 | _, err := dec.Token() |
| 58 | if err == io.EOF { |
| 59 | return nil |
| 60 | } |
| 61 | if err != nil { |
| 62 | return fmt.Errorf("invalid xhtml content: %w", err) |
| 63 | } |
| 64 | } |
| 65 | } |