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