forgejo/modules/markdown/markdown.go

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// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
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package markdown
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import (
"bytes"
"fmt"
"io"
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"path"
"path/filepath"
"regexp"
"strings"
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"github.com/Unknwon/com"
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"github.com/microcosm-cc/bluemonday"
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"github.com/russross/blackfriday"
"golang.org/x/net/html"
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"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/setting"
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)
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// Issue name styles
const (
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IssueNameStyleNumeric = "numeric"
IssueNameStyleAlphanumeric = "alphanumeric"
)
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// Sanitizer markdown sanitizer
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var Sanitizer = bluemonday.UGCPolicy()
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// BuildSanitizer initializes sanitizer with allowed attributes based on settings.
// This function should only be called once during entire application lifecycle.
func BuildSanitizer() {
// Normal markdown-stuff
Sanitizer.AllowAttrs("class").Matching(regexp.MustCompile(`[\p{L}\p{N}\s\-_',:\[\]!\./\\\(\)&]*`)).OnElements("code")
// Checkboxes
Sanitizer.AllowAttrs("type").Matching(regexp.MustCompile(`^checkbox$`)).OnElements("input")
Sanitizer.AllowAttrs("checked", "disabled").OnElements("input")
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// Custom URL-Schemes
Sanitizer.AllowURLSchemes(setting.Markdown.CustomURLSchemes...)
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}
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var validLinksPattern = regexp.MustCompile(`^[a-z][\w-]+://`)
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// isLink reports whether link fits valid format.
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func isLink(link []byte) bool {
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return validLinksPattern.Match(link)
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}
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// IsMarkdownFile reports whether name looks like a Markdown file
// based on its extension.
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func IsMarkdownFile(name string) bool {
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extension := strings.ToLower(filepath.Ext(name))
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for _, ext := range setting.Markdown.FileExtensions {
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if strings.ToLower(ext) == extension {
return true
}
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}
return false
}
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// IsReadmeFile reports whether name looks like a README file
// based on its extension.
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func IsReadmeFile(name string) bool {
name = strings.ToLower(name)
if len(name) < 6 {
return false
} else if len(name) == 6 {
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return name == "readme"
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}
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return name[:7] == "readme."
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}
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var (
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// MentionPattern matches string that mentions someone, e.g. @Unknwon
MentionPattern = regexp.MustCompile(`(\s|^|\W)@[0-9a-zA-Z-_\.]+`)
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// CommitPattern matches link to certain commit with or without trailing hash,
// e.g. https://try.gogs.io/gogs/gogs/commit/d8a994ef243349f321568f9e36d5c3f444b99cae#diff-2
CommitPattern = regexp.MustCompile(`(\s|^)https?.*commit/[0-9a-zA-Z]+(#+[0-9a-zA-Z-]*)?`)
// IssueFullPattern matches link to an issue with or without trailing hash,
// e.g. https://try.gogs.io/gogs/gogs/issues/4#issue-685
IssueFullPattern = regexp.MustCompile(`(\s|^)https?.*issues/[0-9]+(#+[0-9a-zA-Z-]*)?`)
// IssueNumericPattern matches string that references to a numeric issue, e.g. #1287
IssueNumericPattern = regexp.MustCompile(`( |^|\()#[0-9]+\b`)
// IssueAlphanumericPattern matches string that references to an alphanumeric issue, e.g. ABC-1234
IssueAlphanumericPattern = regexp.MustCompile(`( |^|\()[A-Z]{1,10}-[1-9][0-9]*\b`)
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// Sha1CurrentPattern matches string that represents a commit SHA, e.g. d8a994ef243349f321568f9e36d5c3f444b99cae
// FIXME: this pattern matches pure numbers as well, right now we do a hack to check in RenderSha1CurrentPattern
// by converting string to a number.
Sha1CurrentPattern = regexp.MustCompile(`\b[0-9a-f]{40}\b`)
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)
// FindAllMentions matches mention patterns in given content
// and returns a list of found user names without @ prefix.
func FindAllMentions(content string) []string {
mentions := MentionPattern.FindAllString(content, -1)
for i := range mentions {
mentions[i] = mentions[i][strings.Index(mentions[i], "@")+1:] // Strip @ character
}
return mentions
}
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// Renderer is a extended version of underlying render object.
type Renderer struct {
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blackfriday.Renderer
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urlPrefix string
}
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// Link defines how formal links should be processed to produce corresponding HTML elements.
func (r *Renderer) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
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if len(link) > 0 && !isLink(link) {
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if link[0] != '#' {
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link = []byte(path.Join(r.urlPrefix, string(link)))
}
}
r.Renderer.Link(out, link, title, content)
}
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// AutoLink defines how auto-detected links should be processed to produce corresponding HTML elements.
// Reference for kind: https://github.com/russross/blackfriday/blob/master/markdown.go#L69-L76
func (r *Renderer) AutoLink(out *bytes.Buffer, link []byte, kind int) {
if kind != blackfriday.LINK_TYPE_NORMAL {
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r.Renderer.AutoLink(out, link, kind)
return
}
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// Since this method could only possibly serve one link at a time,
// we do not need to find all.
if bytes.HasPrefix(link, []byte(setting.AppUrl)) {
m := CommitPattern.Find(link)
if m != nil {
m = bytes.TrimSpace(m)
i := strings.Index(string(m), "commit/")
j := strings.Index(string(m), "#")
if j == -1 {
j = len(m)
}
out.WriteString(fmt.Sprintf(` <code><a href="%s">%s</a></code>`, m, base.ShortSha(string(m[i+7:j]))))
return
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}
m = IssueFullPattern.Find(link)
if m != nil {
m = bytes.TrimSpace(m)
i := strings.Index(string(m), "issues/")
j := strings.Index(string(m), "#")
if j == -1 {
j = len(m)
}
out.WriteString(fmt.Sprintf(`<a href="%s">#%s</a>`, m, base.ShortSha(string(m[i+7:j]))))
return
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}
}
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r.Renderer.AutoLink(out, link, kind)
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}
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// ListItem defines how list items should be processed to produce corresponding HTML elements.
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func (r *Renderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
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// Detect procedures to draw checkboxes.
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switch {
case bytes.HasPrefix(text, []byte("[ ] ")):
text = append([]byte(`<input type="checkbox" disabled="" />`), text[3:]...)
case bytes.HasPrefix(text, []byte("[x] ")):
text = append([]byte(`<input type="checkbox" disabled="" checked="" />`), text[3:]...)
}
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r.Renderer.ListItem(out, text, flags)
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}
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// Note: this section is for purpose of increase performance and
// reduce memory allocation at runtime since they are constant literals.
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var (
svgSuffix = []byte(".svg")
svgSuffixWithMark = []byte(".svg?")
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spaceBytes = []byte(" ")
spaceEncodedBytes = []byte("%20")
space = " "
spaceEncoded = "%20"
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)
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// Image defines how images should be processed to produce corresponding HTML elements.
func (r *Renderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
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prefix := strings.Replace(r.urlPrefix, "/src/", "/raw/", 1)
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if len(link) > 0 {
if isLink(link) {
// External link with .svg suffix usually means CI status.
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// TODO: define a keyword to allow non-svg images render as external link.
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if bytes.HasSuffix(link, svgSuffix) || bytes.Contains(link, svgSuffixWithMark) {
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r.Renderer.Image(out, link, title, alt)
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return
}
} else {
if link[0] != '/' {
prefix += "/"
}
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link = bytes.Replace([]byte((prefix + string(link))), spaceBytes, spaceEncodedBytes, -1)
fmt.Println(333, string(link))
}
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}
out.WriteString(`<a href="`)
out.Write(link)
out.WriteString(`">`)
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r.Renderer.Image(out, link, title, alt)
out.WriteString("</a>")
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}
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// cutoutVerbosePrefix cutouts URL prefix including sub-path to
// return a clean unified string of request URL path.
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func cutoutVerbosePrefix(prefix string) string {
if len(prefix) == 0 || prefix[0] != '/' {
return prefix
}
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count := 0
for i := 0; i < len(prefix); i++ {
if prefix[i] == '/' {
count++
}
if count >= 3+setting.AppSubUrlDepth {
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return prefix[:i]
}
}
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return prefix
}
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// RenderIssueIndexPattern renders issue indexes to corresponding links.
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func RenderIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
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urlPrefix = cutoutVerbosePrefix(urlPrefix)
pattern := IssueNumericPattern
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if metas["style"] == IssueNameStyleAlphanumeric {
pattern = IssueAlphanumericPattern
}
ms := pattern.FindAll(rawBytes, -1)
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for _, m := range ms {
if m[0] == ' ' || m[0] == '(' {
m = m[1:] // ignore leading space or opening parentheses
}
var link string
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if metas == nil {
link = fmt.Sprintf(`<a href="%s/issues/%s">%s</a>`, urlPrefix, m[1:], m)
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} else {
// Support for external issue tracker
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if metas["style"] == IssueNameStyleAlphanumeric {
metas["index"] = string(m)
} else {
metas["index"] = string(m[1:])
}
link = fmt.Sprintf(`<a href="%s">%s</a>`, com.Expand(metas["format"], metas), m)
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}
rawBytes = bytes.Replace(rawBytes, m, []byte(link), 1)
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}
return rawBytes
}
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// RenderSha1CurrentPattern renders SHA1 strings to corresponding links that assumes in the same repository.
func RenderSha1CurrentPattern(rawBytes []byte, urlPrefix string) []byte {
return []byte(Sha1CurrentPattern.ReplaceAllStringFunc(string(rawBytes[:]), func(m string) string {
if com.StrTo(m).MustInt() > 0 {
return m
}
return fmt.Sprintf(`<a href="%s/commit/%s"><code>%s</code></a>`, urlPrefix, m, base.ShortSha(string(m)))
}))
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}
// RenderSpecialLink renders mentions, indexes and SHA1 strings to corresponding links.
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func RenderSpecialLink(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
ms := MentionPattern.FindAll(rawBytes, -1)
for _, m := range ms {
m = m[bytes.Index(m, []byte("@")):]
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rawBytes = bytes.Replace(rawBytes, m,
[]byte(fmt.Sprintf(`<a href="%s/%s">%s</a>`, setting.AppSubUrl, m[1:], m)), -1)
}
rawBytes = RenderIssueIndexPattern(rawBytes, urlPrefix, metas)
rawBytes = RenderSha1CurrentPattern(rawBytes, urlPrefix)
return rawBytes
}
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// RenderRaw renders Markdown to HTML without handling special links.
func RenderRaw(body []byte, urlPrefix string) []byte {
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htmlFlags := 0
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htmlFlags |= blackfriday.HTML_SKIP_STYLE
htmlFlags |= blackfriday.HTML_OMIT_CONTENTS
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renderer := &Renderer{
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Renderer: blackfriday.HtmlRenderer(htmlFlags, "", ""),
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urlPrefix: urlPrefix,
}
// set up the parser
extensions := 0
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extensions |= blackfriday.EXTENSION_NO_INTRA_EMPHASIS
extensions |= blackfriday.EXTENSION_TABLES
extensions |= blackfriday.EXTENSION_FENCED_CODE
extensions |= blackfriday.EXTENSION_AUTOLINK
extensions |= blackfriday.EXTENSION_STRIKETHROUGH
extensions |= blackfriday.EXTENSION_SPACE_HEADERS
extensions |= blackfriday.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
if setting.Markdown.EnableHardLineBreak {
extensions |= blackfriday.EXTENSION_HARD_LINE_BREAK
}
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body = blackfriday.Markdown(body, renderer, extensions)
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return body
}
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var (
leftAngleBracket = []byte("</")
rightAngleBracket = []byte(">")
)
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var noEndTags = []string{"img", "input", "br", "hr"}
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// PostProcess treats different types of HTML differently,
// and only renders special links for plain text blocks.
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func PostProcess(rawHTML []byte, urlPrefix string, metas map[string]string) []byte {
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startTags := make([]string, 0, 5)
var buf bytes.Buffer
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tokenizer := html.NewTokenizer(bytes.NewReader(rawHTML))
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OUTER_LOOP:
for html.ErrorToken != tokenizer.Next() {
token := tokenizer.Token()
switch token.Type {
case html.TextToken:
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buf.Write(RenderSpecialLink([]byte(token.String()), urlPrefix, metas))
case html.StartTagToken:
buf.WriteString(token.String())
tagName := token.Data
// If this is an excluded tag, we skip processing all output until a close tag is encountered.
if strings.EqualFold("a", tagName) || strings.EqualFold("code", tagName) || strings.EqualFold("pre", tagName) {
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stackNum := 1
for html.ErrorToken != tokenizer.Next() {
token = tokenizer.Token()
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// Copy the token to the output verbatim
buf.WriteString(token.String())
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if token.Type == html.StartTagToken {
stackNum++
}
// If this is the close tag to the outer-most, we are done
if token.Type == html.EndTagToken {
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stackNum--
if stackNum <= 0 && strings.EqualFold(tagName, token.Data) {
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break
}
}
}
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continue OUTER_LOOP
}
if !com.IsSliceContainsStr(noEndTags, token.Data) {
startTags = append(startTags, token.Data)
}
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case html.EndTagToken:
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if len(startTags) == 0 {
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buf.WriteString(token.String())
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break
}
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buf.Write(leftAngleBracket)
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buf.WriteString(startTags[len(startTags)-1])
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buf.Write(rightAngleBracket)
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startTags = startTags[:len(startTags)-1]
default:
buf.WriteString(token.String())
}
}
if io.EOF == tokenizer.Err() {
return buf.Bytes()
}
// If we are not at the end of the input, then some other parsing error has occurred,
// so return the input verbatim.
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return rawHTML
}
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// Render renders Markdown to HTML with special links.
func Render(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
urlPrefix = strings.Replace(urlPrefix, space, spaceEncoded, -1)
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result := RenderRaw(rawBytes, urlPrefix)
result = PostProcess(result, urlPrefix, metas)
result = Sanitizer.SanitizeBytes(result)
return result
}
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// RenderString renders Markdown to HTML with special links and returns string type.
func RenderString(raw, urlPrefix string, metas map[string]string) string {
return string(Render([]byte(raw), urlPrefix, metas))
}