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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.
package base
import (
"bytes"
"fmt"
"io"
"net/http"
"path"
"path/filepath"
"regexp"
"strings"
"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)
}
func (options *CustomRender) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
if len(link) > 0 && !isLink(link) {
link = []byte(path.Join(strings.Replace(options.urlPrefix, "/src/", "/raw/", 1), string(link)))
}
options.Renderer.Image(out, link, title, alt)
}
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 RenderIssueIndexPattern(rawBytes []byte, urlPrefix string) []byte {
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
body = blackfriday.Markdown(body, renderer, extensions)
return body
}
// PostProcessMarkdown treats different types of HTML differently,
// and only renders special links for plain text blocks.
func PostProcessMarkdown(rawHtml []byte, urlPrefix string) []byte {
var buf bytes.Buffer
tokenizer := html.NewTokenizer(bytes.NewReader(rawHtml))
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 html.EndTagToken == token.Type && strings.EqualFold(tagName, token.Data) {
break
}
}
}
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))
}
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