98 lines
2.0 KiB
Go
98 lines
2.0 KiB
Go
package telegraph
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import (
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"bytes"
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"errors"
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"strings"
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html "golang.org/x/net/html"
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)
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var (
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availableTags = map[string]bool{
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"a": true,
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"aside": true,
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"b": true,
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"blockquote": true,
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"br": true,
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"code": true,
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"em": true,
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"figcaption": true,
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"figure": true,
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"h3": true,
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"h4": true,
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"hr": true,
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"i": true,
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"iframe": true,
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"img": true,
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"li": true,
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"ol": true,
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"p": true,
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"pre": true,
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"s": true,
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"strong": true,
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"u": true,
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"ul": true,
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"video": true,
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}
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availableAttributes = map[string]bool{
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"href": true,
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"src": true,
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}
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)
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// ContentFormat transforms data to a DOM-based format to represent the
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// content of the page.
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func ContentFormat(data interface{}) ([]Node, error) {
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var doc html.Node
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switch dst := data.(type) {
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case string:
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dom, err := html.Parse(strings.NewReader(dst))
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if err != nil {
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return nil, err
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}
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doc = *dom
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case []byte:
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dom, err := html.Parse(bytes.NewReader(dst))
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if err != nil {
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return nil, err
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}
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doc = *dom
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default:
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return nil, errors.New("invalid data type, use []byte or string")
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}
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var content []Node
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content = append(content, domToNode(doc.FirstChild))
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return content, nil
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}
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func domToNode(domNode *html.Node) interface{} {
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if domNode.Type == html.TextNode {
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return domNode.Data
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}
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if domNode.Type != html.ElementNode {
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return nil
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}
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var nodeElement NodeElement
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if _, ok := availableTags[strings.ToLower(domNode.Data)]; ok {
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nodeElement.Tag = domNode.Data
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for _, attr := range domNode.Attr {
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if _, ok := availableAttributes[strings.ToLower(attr.Key)]; ok {
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nodeElement.Attrs = map[string]string{attr.Key: attr.Val}
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}
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}
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}
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for child := domNode.FirstChild; child != nil; child = child.NextSibling {
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nodeElement.Children = append(nodeElement.Children, domToNode(child))
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}
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return nodeElement
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}
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