mirror of
https://codeberg.org/forgejo/forgejo
synced 2024-11-24 10:46:10 +01:00
408 lines
13 KiB
Go
408 lines
13 KiB
Go
// 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.
|
|
|
|
package markdown
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"path"
|
|
"path/filepath"
|
|
"regexp"
|
|
"strings"
|
|
|
|
"github.com/Unknwon/com"
|
|
"github.com/microcosm-cc/bluemonday"
|
|
"github.com/russross/blackfriday"
|
|
"golang.org/x/net/html"
|
|
|
|
"code.gitea.io/gitea/modules/base"
|
|
"code.gitea.io/gitea/modules/setting"
|
|
)
|
|
|
|
// Issue name styles
|
|
const (
|
|
IssueNameStyleNumeric = "numeric"
|
|
IssueNameStyleAlphanumeric = "alphanumeric"
|
|
)
|
|
|
|
// Sanitizer markdown sanitizer
|
|
var Sanitizer = bluemonday.UGCPolicy()
|
|
|
|
// 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")
|
|
|
|
// Custom URL-Schemes
|
|
Sanitizer.AllowURLSchemes(setting.Markdown.CustomURLSchemes...)
|
|
}
|
|
|
|
var validLinksPattern = regexp.MustCompile(`^[a-z][\w-]+://`)
|
|
|
|
// isLink reports whether link fits valid format.
|
|
func isLink(link []byte) bool {
|
|
return validLinksPattern.Match(link)
|
|
}
|
|
|
|
// IsMarkdownFile reports whether name looks like a Markdown file
|
|
// based on its extension.
|
|
func IsMarkdownFile(name string) bool {
|
|
extension := strings.ToLower(filepath.Ext(name))
|
|
for _, ext := range setting.Markdown.FileExtensions {
|
|
if strings.ToLower(ext) == extension {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// IsReadmeFile reports whether name looks like a README file
|
|
// based on its extension.
|
|
func IsReadmeFile(name string) bool {
|
|
name = strings.ToLower(name)
|
|
if len(name) < 6 {
|
|
return false
|
|
} else if len(name) == 6 {
|
|
return name == "readme"
|
|
}
|
|
return name[:7] == "readme."
|
|
}
|
|
|
|
var (
|
|
// MentionPattern matches string that mentions someone, e.g. @Unknwon
|
|
MentionPattern = regexp.MustCompile(`(\s|^|\W)@[0-9a-zA-Z-_\.]+`)
|
|
|
|
// 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`)
|
|
|
|
// 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`)
|
|
)
|
|
|
|
// 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
|
|
}
|
|
|
|
// Renderer is a extended version of underlying render object.
|
|
type Renderer struct {
|
|
blackfriday.Renderer
|
|
urlPrefix string
|
|
}
|
|
|
|
// 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) {
|
|
if len(link) > 0 && !isLink(link) {
|
|
if link[0] != '#' {
|
|
link = []byte(path.Join(r.urlPrefix, string(link)))
|
|
}
|
|
}
|
|
|
|
r.Renderer.Link(out, link, title, content)
|
|
}
|
|
|
|
// 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 {
|
|
r.Renderer.AutoLink(out, link, kind)
|
|
return
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
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
|
|
}
|
|
}
|
|
|
|
r.Renderer.AutoLink(out, link, kind)
|
|
}
|
|
|
|
// ListItem defines how list items should be processed to produce corresponding HTML elements.
|
|
func (r *Renderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
|
|
// Detect procedures to draw checkboxes.
|
|
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:]...)
|
|
}
|
|
r.Renderer.ListItem(out, text, flags)
|
|
}
|
|
|
|
// Note: this section is for purpose of increase performance and
|
|
// reduce memory allocation at runtime since they are constant literals.
|
|
var (
|
|
svgSuffix = []byte(".svg")
|
|
svgSuffixWithMark = []byte(".svg?")
|
|
spaceBytes = []byte(" ")
|
|
spaceEncodedBytes = []byte("%20")
|
|
space = " "
|
|
spaceEncoded = "%20"
|
|
)
|
|
|
|
// 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) {
|
|
prefix := strings.Replace(r.urlPrefix, "/src/", "/raw/", 1)
|
|
if len(link) > 0 {
|
|
if isLink(link) {
|
|
// External link with .svg suffix usually means CI status.
|
|
// TODO: define a keyword to allow non-svg images render as external link.
|
|
if bytes.HasSuffix(link, svgSuffix) || bytes.Contains(link, svgSuffixWithMark) {
|
|
r.Renderer.Image(out, link, title, alt)
|
|
return
|
|
}
|
|
} else {
|
|
if link[0] != '/' {
|
|
prefix += "/"
|
|
}
|
|
link = bytes.Replace([]byte((prefix + string(link))), spaceBytes, spaceEncodedBytes, -1)
|
|
fmt.Println(333, string(link))
|
|
}
|
|
}
|
|
|
|
out.WriteString(`<a href="`)
|
|
out.Write(link)
|
|
out.WriteString(`">`)
|
|
r.Renderer.Image(out, link, title, alt)
|
|
out.WriteString("</a>")
|
|
}
|
|
|
|
// cutoutVerbosePrefix cutouts URL prefix including sub-path to
|
|
// return a clean unified string of request URL path.
|
|
func cutoutVerbosePrefix(prefix string) string {
|
|
if len(prefix) == 0 || prefix[0] != '/' {
|
|
return prefix
|
|
}
|
|
count := 0
|
|
for i := 0; i < len(prefix); i++ {
|
|
if prefix[i] == '/' {
|
|
count++
|
|
}
|
|
if count >= 3+setting.AppSubURLDepth {
|
|
return prefix[:i]
|
|
}
|
|
}
|
|
return prefix
|
|
}
|
|
|
|
// RenderIssueIndexPattern renders issue indexes to corresponding links.
|
|
func RenderIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string]string) []byte {
|
|
urlPrefix = cutoutVerbosePrefix(urlPrefix)
|
|
|
|
pattern := IssueNumericPattern
|
|
if metas["style"] == IssueNameStyleAlphanumeric {
|
|
pattern = IssueAlphanumericPattern
|
|
}
|
|
|
|
ms := pattern.FindAll(rawBytes, -1)
|
|
for _, m := range ms {
|
|
if m[0] == ' ' || m[0] == '(' {
|
|
m = m[1:] // ignore leading space or opening parentheses
|
|
}
|
|
var link string
|
|
if metas == nil {
|
|
link = fmt.Sprintf(`<a href="%s/issues/%s">%s</a>`, urlPrefix, m[1:], m)
|
|
} else {
|
|
// Support for external issue tracker
|
|
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)
|
|
}
|
|
rawBytes = bytes.Replace(rawBytes, m, []byte(link), 1)
|
|
}
|
|
return rawBytes
|
|
}
|
|
|
|
// 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)))
|
|
}))
|
|
}
|
|
|
|
// RenderSpecialLink renders mentions, indexes and SHA1 strings to corresponding links.
|
|
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("@")):]
|
|
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
|
|
}
|
|
|
|
// RenderRaw renders Markdown to HTML without handling special links.
|
|
func RenderRaw(body []byte, urlPrefix string) []byte {
|
|
htmlFlags := 0
|
|
htmlFlags |= blackfriday.HTML_SKIP_STYLE
|
|
htmlFlags |= blackfriday.HTML_OMIT_CONTENTS
|
|
renderer := &Renderer{
|
|
Renderer: blackfriday.HtmlRenderer(htmlFlags, "", ""),
|
|
urlPrefix: urlPrefix,
|
|
}
|
|
|
|
// set up the parser
|
|
extensions := 0
|
|
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
|
|
}
|
|
|
|
body = blackfriday.Markdown(body, renderer, extensions)
|
|
return body
|
|
}
|
|
|
|
var (
|
|
leftAngleBracket = []byte("</")
|
|
rightAngleBracket = []byte(">")
|
|
)
|
|
|
|
var noEndTags = []string{"img", "input", "br", "hr"}
|
|
|
|
// PostProcess treats different types of HTML differently,
|
|
// and only renders special links for plain text blocks.
|
|
func PostProcess(rawHTML []byte, urlPrefix string, metas map[string]string) []byte {
|
|
startTags := make([]string, 0, 5)
|
|
var buf bytes.Buffer
|
|
tokenizer := html.NewTokenizer(bytes.NewReader(rawHTML))
|
|
|
|
OUTER_LOOP:
|
|
for html.ErrorToken != tokenizer.Next() {
|
|
token := tokenizer.Token()
|
|
switch token.Type {
|
|
case html.TextToken:
|
|
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) {
|
|
stackNum := 1
|
|
for html.ErrorToken != tokenizer.Next() {
|
|
token = tokenizer.Token()
|
|
|
|
// Copy the token to the output verbatim
|
|
buf.WriteString(token.String())
|
|
|
|
if token.Type == html.StartTagToken {
|
|
stackNum++
|
|
}
|
|
|
|
// If this is the close tag to the outer-most, we are done
|
|
if token.Type == html.EndTagToken {
|
|
stackNum--
|
|
|
|
if stackNum <= 0 && strings.EqualFold(tagName, token.Data) {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
continue OUTER_LOOP
|
|
}
|
|
|
|
if !com.IsSliceContainsStr(noEndTags, token.Data) {
|
|
startTags = append(startTags, token.Data)
|
|
}
|
|
|
|
case html.EndTagToken:
|
|
if len(startTags) == 0 {
|
|
buf.WriteString(token.String())
|
|
break
|
|
}
|
|
|
|
buf.Write(leftAngleBracket)
|
|
buf.WriteString(startTags[len(startTags)-1])
|
|
buf.Write(rightAngleBracket)
|
|
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.
|
|
return rawHTML
|
|
}
|
|
|
|
// 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)
|
|
result := RenderRaw(rawBytes, urlPrefix)
|
|
result = PostProcess(result, urlPrefix, metas)
|
|
result = Sanitizer.SanitizeBytes(result)
|
|
return result
|
|
}
|
|
|
|
// 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))
|
|
}
|