mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-05 01:19:20 +08:00
320 lines
8.6 KiB
Go
320 lines
8.6 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 base
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"path"
|
|
"path/filepath"
|
|
"regexp"
|
|
"strings"
|
|
|
|
"github.com/Unknwon/com"
|
|
"github.com/russross/blackfriday"
|
|
"golang.org/x/net/html"
|
|
|
|
"github.com/gogits/gogs/modules/setting"
|
|
)
|
|
|
|
func isletter(c byte) bool {
|
|
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
|
|
}
|
|
|
|
func isalnum(c byte) bool {
|
|
return (c >= '0' && c <= '9') || isletter(c)
|
|
}
|
|
|
|
var validLinks = [][]byte{[]byte("http://"), []byte("https://"), []byte("ftp://"), []byte("mailto://")}
|
|
|
|
func isLink(link []byte) bool {
|
|
for _, prefix := range validLinks {
|
|
if len(link) > len(prefix) && bytes.Equal(bytes.ToLower(link[:len(prefix)]), prefix) && isalnum(link[len(prefix)]) {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func IsMarkdownFile(name string) bool {
|
|
name = strings.ToLower(name)
|
|
switch filepath.Ext(name) {
|
|
case ".md", ".markdown", ".mdown", ".mkd":
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func IsTextFile(data []byte) (string, bool) {
|
|
contentType := http.DetectContentType(data)
|
|
if strings.Index(contentType, "text/") != -1 {
|
|
return contentType, true
|
|
}
|
|
return contentType, false
|
|
}
|
|
|
|
func IsImageFile(data []byte) (string, bool) {
|
|
contentType := http.DetectContentType(data)
|
|
if strings.Index(contentType, "image/") != -1 {
|
|
return contentType, true
|
|
}
|
|
return contentType, false
|
|
}
|
|
|
|
// IsReadmeFile returns true if given file name suppose to be a README file.
|
|
func IsReadmeFile(name string) bool {
|
|
name = strings.ToLower(name)
|
|
if len(name) < 6 {
|
|
return false
|
|
} else if len(name) == 6 {
|
|
if name == "readme" {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
if name[:7] == "readme." {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
type CustomRender struct {
|
|
blackfriday.Renderer
|
|
urlPrefix string
|
|
}
|
|
|
|
func (options *CustomRender) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
|
|
if len(link) > 0 && !isLink(link) {
|
|
if link[0] == '#' {
|
|
// link = append([]byte(options.urlPrefix), link...)
|
|
} else {
|
|
link = []byte(path.Join(options.urlPrefix, string(link)))
|
|
}
|
|
}
|
|
|
|
options.Renderer.Link(out, link, title, content)
|
|
}
|
|
|
|
var (
|
|
svgSuffix = []byte(".svg")
|
|
svgSuffixWithMark = []byte(".svg?")
|
|
)
|
|
|
|
func (options *CustomRender) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
|
|
prefix := strings.Replace(options.urlPrefix, "/src/", "/raw/", 1)
|
|
if len(link) > 0 {
|
|
if isLink(link) {
|
|
// External link with .svg suffix usually means CI status.
|
|
if bytes.HasSuffix(link, svgSuffix) || bytes.Contains(link, svgSuffixWithMark) {
|
|
options.Renderer.Image(out, link, title, alt)
|
|
return
|
|
}
|
|
} else {
|
|
if link[0] != '/' {
|
|
prefix += "/"
|
|
}
|
|
link = []byte(prefix + string(link))
|
|
}
|
|
}
|
|
|
|
out.WriteString(`<a href="`)
|
|
out.Write(link)
|
|
out.WriteString(`">`)
|
|
options.Renderer.Image(out, link, title, alt)
|
|
out.WriteString("</a>")
|
|
}
|
|
|
|
var (
|
|
MentionPattern = regexp.MustCompile(`(\s|^)@[0-9a-zA-Z_\.]+`)
|
|
commitPattern = regexp.MustCompile(`(\s|^)https?.*commit/[0-9a-zA-Z]+(#+[0-9a-zA-Z-]*)?`)
|
|
issueFullPattern = regexp.MustCompile(`(\s|^)https?.*issues/[0-9]+(#+[0-9a-zA-Z-]*)?`)
|
|
issueIndexPattern = regexp.MustCompile(`( |^)#[0-9]+\b`)
|
|
sha1CurrentPattern = regexp.MustCompile(`\b[0-9a-f]{40}\b`)
|
|
)
|
|
|
|
func RenderSpecialLink(rawBytes []byte, urlPrefix string) []byte {
|
|
ms := MentionPattern.FindAll(rawBytes, -1)
|
|
for _, m := range ms {
|
|
m = bytes.TrimSpace(m)
|
|
rawBytes = bytes.Replace(rawBytes, m,
|
|
[]byte(fmt.Sprintf(`<a href="%s/%s">%s</a>`, setting.AppSubUrl, m[1:], m)), -1)
|
|
}
|
|
|
|
ms = commitPattern.FindAll(rawBytes, -1)
|
|
for _, m := range ms {
|
|
m = bytes.TrimSpace(m)
|
|
i := strings.Index(string(m), "commit/")
|
|
j := strings.Index(string(m), "#")
|
|
if j == -1 {
|
|
j = len(m)
|
|
}
|
|
rawBytes = bytes.Replace(rawBytes, m, []byte(fmt.Sprintf(
|
|
` <code><a href="%s">%s</a></code>`, m, ShortSha(string(m[i+7:j])))), -1)
|
|
}
|
|
ms = issueFullPattern.FindAll(rawBytes, -1)
|
|
for _, m := range ms {
|
|
m = bytes.TrimSpace(m)
|
|
i := strings.Index(string(m), "issues/")
|
|
j := strings.Index(string(m), "#")
|
|
if j == -1 {
|
|
j = len(m)
|
|
}
|
|
rawBytes = bytes.Replace(rawBytes, m, []byte(fmt.Sprintf(
|
|
` <a href="%s">#%s</a>`, m, ShortSha(string(m[i+7:j])))), -1)
|
|
}
|
|
rawBytes = RenderIssueIndexPattern(rawBytes, urlPrefix)
|
|
rawBytes = RenderSha1CurrentPattern(rawBytes, urlPrefix)
|
|
return rawBytes
|
|
}
|
|
|
|
func RenderSha1CurrentPattern(rawBytes []byte, urlPrefix string) []byte {
|
|
ms := sha1CurrentPattern.FindAll(rawBytes, -1)
|
|
for _, m := range ms {
|
|
rawBytes = bytes.Replace(rawBytes, m, []byte(fmt.Sprintf(
|
|
`<a href="%s/commit/%s"><code>%s</code></a>`, urlPrefix, m, ShortSha(string(m)))), -1)
|
|
}
|
|
return rawBytes
|
|
}
|
|
|
|
func cutoutVerbosePrefix(prefix string) string {
|
|
count := 0
|
|
for i := 0; i < len(prefix); i++ {
|
|
if prefix[i] == '/' {
|
|
count++
|
|
}
|
|
if count >= 3 {
|
|
return prefix[:i]
|
|
}
|
|
}
|
|
return prefix
|
|
}
|
|
|
|
func RenderIssueIndexPattern(rawBytes []byte, urlPrefix string) []byte {
|
|
urlPrefix = cutoutVerbosePrefix(urlPrefix)
|
|
ms := issueIndexPattern.FindAll(rawBytes, -1)
|
|
for _, m := range ms {
|
|
var space string
|
|
m2 := m
|
|
if m2[0] == ' ' {
|
|
space = " "
|
|
m2 = m2[1:]
|
|
}
|
|
rawBytes = bytes.Replace(rawBytes, m, []byte(fmt.Sprintf(`%s<a href="%s/issues/%s">%s</a>`,
|
|
space, urlPrefix, m2[1:], m2)), 1)
|
|
}
|
|
return rawBytes
|
|
}
|
|
|
|
func RenderRawMarkdown(body []byte, urlPrefix string) []byte {
|
|
htmlFlags := 0
|
|
// htmlFlags |= blackfriday.HTML_USE_XHTML
|
|
// htmlFlags |= blackfriday.HTML_USE_SMARTYPANTS
|
|
// htmlFlags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS
|
|
// htmlFlags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
|
|
// htmlFlags |= blackfriday.HTML_SKIP_HTML
|
|
htmlFlags |= blackfriday.HTML_SKIP_STYLE
|
|
// htmlFlags |= blackfriday.HTML_SKIP_SCRIPT
|
|
// htmlFlags |= blackfriday.HTML_GITHUB_BLOCKCODE
|
|
htmlFlags |= blackfriday.HTML_OMIT_CONTENTS
|
|
// htmlFlags |= blackfriday.HTML_COMPLETE_PAGE
|
|
renderer := &CustomRender{
|
|
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"}
|
|
|
|
// PostProcessMarkdown treats different types of HTML differently,
|
|
// and only renders special links for plain text blocks.
|
|
func PostProcessMarkdown(rawHtml []byte, urlPrefix 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))
|
|
|
|
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) {
|
|
for html.ErrorToken != tokenizer.Next() {
|
|
token = tokenizer.Token()
|
|
|
|
// Copy the token to the output verbatim
|
|
buf.WriteString(token.String())
|
|
// If this is the close tag, we are done
|
|
if token.Type == html.EndTagToken && strings.EqualFold(tagName, token.Data) {
|
|
break
|
|
}
|
|
}
|
|
continue OUTER_LOOP
|
|
}
|
|
|
|
if !com.IsSliceContainsStr(noEndTags, token.Data) {
|
|
startTags = append(startTags, token.Data)
|
|
}
|
|
|
|
case html.EndTagToken:
|
|
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
|
|
}
|
|
|
|
func RenderMarkdown(rawBytes []byte, urlPrefix string) []byte {
|
|
result := RenderRawMarkdown(rawBytes, urlPrefix)
|
|
result = PostProcessMarkdown(result, urlPrefix)
|
|
result = Sanitizer.SanitizeBytes(result)
|
|
return result
|
|
}
|
|
|
|
func RenderMarkdownString(raw, urlPrefix string) string {
|
|
return string(RenderMarkdown([]byte(raw), urlPrefix))
|
|
}
|