mirror of https://github.com/jlelse/GoBlog
150 lines
4.1 KiB
Go
150 lines
4.1 KiB
Go
package main
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import (
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"bytes"
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"strings"
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kemoji "github.com/kyokomi/emoji"
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"github.com/yuin/goldmark"
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emoji "github.com/yuin/goldmark-emoji"
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"github.com/yuin/goldmark-emoji/definition"
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"github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/extension"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/renderer"
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"github.com/yuin/goldmark/renderer/html"
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"github.com/yuin/goldmark/util"
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)
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var emojilib definition.Emojis
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var defaultMarkdown, absoluteMarkdown goldmark.Markdown
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func initMarkdown() {
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defaultGoldmarkOptions := []goldmark.Option{
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goldmark.WithRendererOptions(
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html.WithUnsafe(),
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),
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goldmark.WithParserOptions(
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parser.WithAutoHeadingID(),
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),
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goldmark.WithExtensions(
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extension.Table,
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extension.Strikethrough,
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extension.Footnote,
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extension.Typographer,
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extension.Linkify,
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// Emojis
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emoji.New(
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emoji.WithEmojis(emojiGoLib()),
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),
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),
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}
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defaultMarkdown = goldmark.New(append(defaultGoldmarkOptions, goldmark.WithExtensions(&customExtension{absoluteLinks: false}))...)
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absoluteMarkdown = goldmark.New(append(defaultGoldmarkOptions, goldmark.WithExtensions(&customExtension{absoluteLinks: true}))...)
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}
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func renderMarkdown(source string, absoluteLinks bool) (rendered []byte, err error) {
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var buffer bytes.Buffer
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if absoluteLinks {
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err = absoluteMarkdown.Convert([]byte(source), &buffer)
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} else {
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err = defaultMarkdown.Convert([]byte(source), &buffer)
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}
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return buffer.Bytes(), err
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}
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// Extensions etc...
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// All emojis from emoji lib
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func emojiGoLib() definition.Emojis {
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if emojilib == nil {
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var emojis []definition.Emoji
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for shotcode, e := range kemoji.CodeMap() {
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emojis = append(emojis, definition.NewEmoji(e, []rune(e), strings.ReplaceAll(shotcode, ":", "")))
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}
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emojilib = definition.NewEmojis(emojis...)
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}
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return emojilib
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}
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// Links
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type customExtension struct {
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absoluteLinks bool
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}
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func (l *customExtension) Extend(m goldmark.Markdown) {
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m.Renderer().AddOptions(renderer.WithNodeRenderers(
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util.Prioritized(&customRenderer{
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absoluteLinks: l.absoluteLinks,
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}, 500),
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))
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}
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type customRenderer struct {
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absoluteLinks bool
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}
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func (c *customRenderer) RegisterFuncs(r renderer.NodeRendererFuncRegisterer) {
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r.Register(ast.KindLink, c.renderLink)
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r.Register(ast.KindImage, c.renderImage)
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}
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func (c *customRenderer) renderLink(w util.BufWriter, _ []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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if entering {
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n := node.(*ast.Link)
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_, _ = w.WriteString("<a href=\"")
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// Make URL absolute if it's relative
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newDestination := util.URLEscape(n.Destination, true)
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if c.absoluteLinks && bytes.HasPrefix(newDestination, []byte("/")) {
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_, _ = w.Write(util.EscapeHTML([]byte(appConfig.Server.PublicAddress)))
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}
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_, _ = w.Write(util.EscapeHTML(newDestination))
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_, _ = w.WriteRune('"')
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// Open external links (links that start with "http") in new tab
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if bytes.HasPrefix(n.Destination, []byte("http")) {
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_, _ = w.WriteString(` target="_blank" rel="noopener"`)
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}
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// Title
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if n.Title != nil {
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_, _ = w.WriteString(" title=\"")
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_, _ = w.Write(n.Title)
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_, _ = w.WriteRune('"')
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}
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_, _ = w.WriteRune('>')
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} else {
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_, _ = w.WriteString("</a>")
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}
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return ast.WalkContinue, nil
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}
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func (c *customRenderer) renderImage(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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if !entering {
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return ast.WalkContinue, nil
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}
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n := node.(*ast.Image)
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// Make URL absolute if it's relative
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destination := util.URLEscape(n.Destination, true)
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if bytes.HasPrefix(destination, []byte("/")) {
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destination = util.EscapeHTML(append([]byte(appConfig.Server.PublicAddress), destination...))
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} else {
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destination = util.EscapeHTML(destination)
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}
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_, _ = w.WriteString("<a href=\"")
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_, _ = w.Write(destination)
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_, _ = w.WriteString("\">")
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_, _ = w.WriteString("<img src=\"")
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_, _ = w.Write(destination)
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_, _ = w.WriteString("\" alt=\"")
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_, _ = w.Write(util.EscapeHTML(n.Text(source)))
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_ = w.WriteByte('"')
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_, _ = w.WriteString(" loading=\"lazy\"")
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if n.Title != nil {
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_, _ = w.WriteString(" title=\"")
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_, _ = w.Write(n.Title)
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_ = w.WriteByte('"')
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}
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_, _ = w.WriteString("></a>")
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return ast.WalkSkipChildren, nil
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}
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