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render.go
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render.go
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package posts
import (
"github.com/microcosm-cc/bluemonday"
"github.com/writeas/saturday"
"html"
"regexp"
"strings"
"unicode"
)
var (
blockReg = regexp.MustCompile("<(ul|ol|blockquote)>\n")
endBlockReg = regexp.MustCompile("</([a-z]+)>\n</(ul|ol|blockquote)>")
markeddownReg = regexp.MustCompile("<p>(.+)</p>")
)
func ApplyMarkdown(data []byte) string {
mdExtensions := 0 |
blackfriday.EXTENSION_TABLES |
blackfriday.EXTENSION_FENCED_CODE |
blackfriday.EXTENSION_AUTOLINK |
blackfriday.EXTENSION_STRIKETHROUGH |
blackfriday.EXTENSION_SPACE_HEADERS |
blackfriday.EXTENSION_HEADER_IDS
htmlFlags := 0 |
blackfriday.HTML_USE_SMARTYPANTS |
blackfriday.HTML_SMARTYPANTS_DASHES
// Generate Markdown
md := blackfriday.Markdown([]byte(data), blackfriday.HtmlRenderer(htmlFlags, "", ""), mdExtensions)
// Strip out bad HTML
policy := bluemonday.UGCPolicy()
policy.AllowAttrs("class", "id").Globally()
outHTML := string(policy.SanitizeBytes(md))
// Strip newlines on certain block elements that render with them
outHTML = blockReg.ReplaceAllString(outHTML, "<$1>")
outHTML = endBlockReg.ReplaceAllString(outHTML, "</$1></$2>")
return outHTML
}
func ApplyBasicMarkdown(data []byte) string {
mdExtensions := 0 |
blackfriday.EXTENSION_STRIKETHROUGH |
blackfriday.EXTENSION_SPACE_HEADERS |
blackfriday.EXTENSION_HEADER_IDS
htmlFlags := 0 |
blackfriday.HTML_SKIP_HTML |
blackfriday.HTML_USE_SMARTYPANTS |
blackfriday.HTML_SMARTYPANTS_DASHES
// Generate Markdown
md := blackfriday.Markdown([]byte(data), blackfriday.HtmlRenderer(htmlFlags, "", ""), mdExtensions)
// Strip out bad HTML
policy := bluemonday.UGCPolicy()
policy.AllowAttrs("class", "id").Globally()
outHTML := string(policy.SanitizeBytes(md))
outHTML = markeddownReg.ReplaceAllString(outHTML, "$1")
outHTML = strings.TrimRightFunc(outHTML, unicode.IsSpace)
return outHTML
}
// ApplyBasicAccessibleMarkdown applies Markdown to the given data, rendering basic text formatting and preserving hard
// line breaks in HTML. It is meant for formatting text in small, multi-line UI elements, like user profile biographies.
func ApplyBasicAccessibleMarkdown(data []byte) string {
mdExtensions := 0 |
blackfriday.EXTENSION_STRIKETHROUGH |
blackfriday.EXTENSION_SPACE_HEADERS |
blackfriday.EXTENSION_HEADER_IDS |
blackfriday.EXTENSION_HARD_LINE_BREAK
htmlFlags := 0 |
blackfriday.HTML_USE_SMARTYPANTS |
blackfriday.HTML_USE_XHTML |
blackfriday.HTML_SMARTYPANTS_DASHES
// Generate Markdown
md := blackfriday.Markdown([]byte(data), blackfriday.HtmlRenderer(htmlFlags, "", ""), mdExtensions)
// Strip out bad HTML
policy := bluemonday.UGCPolicy()
policy.AllowAttrs("class", "id").Globally()
policy.AllowAttrs("rel").OnElements("a")
policy.RequireNoFollowOnLinks(false)
outHTML := string(policy.SanitizeBytes(md))
// Strip surrounding <p> tags that blackfriday adds
outHTML = markeddownReg.ReplaceAllString(outHTML, "$1")
outHTML = strings.TrimRightFunc(outHTML, unicode.IsSpace)
return outHTML
}
// StripHTMLWithoutEscaping strips HTML tags with bluemonday's StrictPolicy, then unescapes the HTML
// entities added in by sanitizing the content.
func StripHTMLWithoutEscaping(content string) string {
return html.UnescapeString(bluemonday.StrictPolicy().Sanitize(content))
}

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