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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| package nip23 | ||
|
|
||
| import ( | ||
| stdhtml "html" | ||
| "io" | ||
| "regexp" | ||
| "strings" | ||
|
|
||
| "github.com/gomarkdown/markdown" | ||
| "github.com/gomarkdown/markdown/ast" | ||
| "github.com/gomarkdown/markdown/html" | ||
| "github.com/gomarkdown/markdown/parser" | ||
| "github.com/microcosm-cc/bluemonday" | ||
| ) | ||
|
|
||
| var nostrEveryMatcher = regexp.MustCompile(`nostr:((npub|note|nevent|nprofile|naddr)1[a-z0-9]+)\b`) | ||
|
|
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| var renderer = html.NewRenderer(html.RendererOptions{ | ||
| Flags: html.HrefTargetBlank | html.SkipHTML, | ||
| RenderNodeHook: func(w io.Writer, node ast.Node, entering bool) (ast.WalkStatus, bool) { | ||
| switch v := node.(type) { | ||
| case *ast.HTMLSpan: | ||
| w.Write([]byte(stdhtml.EscapeString(string(v.Literal)))) | ||
| return ast.GoToNext, true | ||
| case *ast.HTMLBlock: | ||
| w.Write([]byte(stdhtml.EscapeString(string(v.Literal)))) | ||
| return ast.GoToNext, true | ||
| } | ||
|
|
||
| return ast.GoToNext, false | ||
| }, | ||
| }) | ||
|
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| func MarkdownToHTML(md string) string { | ||
| md = strings.ReplaceAll(md, "\u00A0", " ") | ||
|
|
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| // create markdown parser with extensions | ||
| // this parser is stateful so it must be reinitialized every time | ||
| doc := parser.NewWithExtensions( | ||
| parser.AutoHeadingIDs | | ||
| parser.NoIntraEmphasis | | ||
| parser.FencedCode | | ||
| parser.Autolink | | ||
| parser.Footnotes | | ||
| parser.SpaceHeadings, | ||
| ).Parse([]byte(md)) | ||
|
|
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| // create HTML renderer with extensions | ||
| output := string(markdown.Render(doc, renderer)) | ||
|
|
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| // sanitize content | ||
| output = sanitizeXSS(output) | ||
|
|
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| return output | ||
| } | ||
|
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| func sanitizeXSS(html string) string { | ||
| p := bluemonday.UGCPolicy() | ||
| p.RequireNoFollowOnLinks(false) | ||
| p.AllowElements("video", "source") | ||
| p.AllowAttrs("controls", "width").OnElements("video") | ||
| p.AllowAttrs("src", "width").OnElements("source") | ||
| return p.Sanitize(html) | ||
| } |