670 lines
19 KiB
Go
670 lines
19 KiB
Go
// Copyright 2017 The Gitea 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 markup
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import (
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"bytes"
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"net/url"
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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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"code.gitea.io/gitea/modules/base"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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"github.com/Unknwon/com"
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"golang.org/x/net/html"
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"golang.org/x/net/html/atom"
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)
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// Issue name styles
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const (
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IssueNameStyleNumeric = "numeric"
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IssueNameStyleAlphanumeric = "alphanumeric"
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)
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var (
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// NOTE: All below regex matching do not perform any extra validation.
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// Thus a link is produced even if the linked entity does not exist.
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// While fast, this is also incorrect and lead to false positives.
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// TODO: fix invalid linking issue
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// mentionPattern matches all mentions in the form of "@user"
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mentionPattern = regexp.MustCompile(`(?:\s|^|\W)(@[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(`(?:\s|^|\W)(#[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(`(?:\s|^|\W)([A-Z]{1,10}-[1-9][0-9]*)\b`)
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// crossReferenceIssueNumericPattern matches string that references a numeric issue in a different repository
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// e.g. gogits/gogs#12345
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crossReferenceIssueNumericPattern = regexp.MustCompile(`(?:\s|^|\W)([0-9a-zA-Z-_\.]+/[0-9a-zA-Z-_\.]+#[0-9]+)\b`)
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// sha1CurrentPattern matches string that represents a commit SHA, e.g. d8a994ef243349f321568f9e36d5c3f444b99cae
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// Although SHA1 hashes are 40 chars long, the regex matches the hash from 7 to 40 chars in length
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// so that abbreviated hash links can be used as well. This matches git and github useability.
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sha1CurrentPattern = regexp.MustCompile(`(?:\s|^|\W)([0-9a-f]{7,40})\b`)
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// shortLinkPattern matches short but difficult to parse [[name|link|arg=test]] syntax
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shortLinkPattern = regexp.MustCompile(`\[\[(.*?)\]\](\w*)`)
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// anySHA1Pattern allows to split url containing SHA into parts
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anySHA1Pattern = regexp.MustCompile(`https?://(?:\S+/){4}([0-9a-f]{40})/?([^#\s]+)?(?:#(\S+))?`)
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validLinksPattern = regexp.MustCompile(`^[a-z][\w-]+://`)
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// While this email regex is definitely not perfect and I'm sure you can come up
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// with edge cases, it is still accepted by the CommonMark specification, as
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// well as the HTML5 spec:
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// http://spec.commonmark.org/0.28/#email-address
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// https://html.spec.whatwg.org/multipage/input.html#e-mail-state-(type%3Demail)
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emailRegex = regexp.MustCompile("[a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*")
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// matches http/https links. used for autlinking those. partly modified from
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// the original present in autolink.js
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linkRegex = regexp.MustCompile(`(?:(?:http|https):\/\/(?:[\-;:&=\+\$,\w]+@)?[A-Za-z0-9\.\-]+|(?:www\.|[\-;:&=\+\$,\w]+@)[A-Za-z0-9\.\-]+)(?:(?:\/[\+~%\/\.\w\-]*)?\??(?:[\-\+:=&;%@\.\w]*)#?(?:[\.\!\/\\\w]*))?`)
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)
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// regexp for full links to issues/pulls
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var issueFullPattern *regexp.Regexp
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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 isLink(link)
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}
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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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func isLinkStr(link string) bool {
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return validLinksPattern.MatchString(link)
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}
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func getIssueFullPattern() *regexp.Regexp {
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if issueFullPattern == nil {
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appURL := setting.AppURL
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if len(appURL) > 0 && appURL[len(appURL)-1] != '/' {
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appURL += "/"
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}
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issueFullPattern = regexp.MustCompile(appURL +
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`\w+/\w+/(?:issues|pulls)/((?:\w{1,10}-)?[1-9][0-9]*)([\?|#]\S+.(\S+)?)?\b`)
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}
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return issueFullPattern
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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.FindAllStringSubmatch(content, -1)
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ret := make([]string, len(mentions))
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for i, val := range mentions {
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ret[i] = val[1][1:]
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}
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return ret
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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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// IsSameDomain checks if given url string has the same hostname as current Gitea instance
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func IsSameDomain(s string) bool {
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if strings.HasPrefix(s, "/") {
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return true
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}
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if uapp, err := url.Parse(setting.AppURL); err == nil {
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if u, err := url.Parse(s); err == nil {
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return u.Host == uapp.Host
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}
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return false
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}
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return false
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}
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type postProcessError struct {
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context string
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err error
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}
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func (p *postProcessError) Error() string {
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return "PostProcess: " + p.context + ", " + p.Error()
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}
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type processor func(ctx *postProcessCtx, node *html.Node)
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var defaultProcessors = []processor{
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mentionProcessor,
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shortLinkProcessor,
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fullIssuePatternProcessor,
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issueIndexPatternProcessor,
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crossReferenceIssueIndexPatternProcessor,
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fullSha1PatternProcessor,
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sha1CurrentPatternProcessor,
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emailAddressProcessor,
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linkProcessor,
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}
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type postProcessCtx struct {
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metas map[string]string
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urlPrefix string
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isWikiMarkdown bool
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// processors used by this context.
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procs []processor
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// if set to true, when an <a> is found, instead of just returning during
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// visitNode, it will recursively visit the node exclusively running
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// shortLinkProcessorFull with true.
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visitLinksForShortLinks bool
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}
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// PostProcess does the final required transformations to the passed raw HTML
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// data, and ensures its validity. Transformations include: replacing links and
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// emails with HTML links, parsing shortlinks in the format of [[Link]], like
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// MediaWiki, linking issues in the format #ID, and mentions in the format
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// @user, and others.
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func PostProcess(
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rawHTML []byte,
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urlPrefix string,
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metas map[string]string,
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isWikiMarkdown bool,
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) ([]byte, error) {
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// create the context from the parameters
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ctx := &postProcessCtx{
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metas: metas,
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urlPrefix: urlPrefix,
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isWikiMarkdown: isWikiMarkdown,
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procs: defaultProcessors,
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visitLinksForShortLinks: true,
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}
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return ctx.postProcess(rawHTML)
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}
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var commitMessageProcessors = []processor{
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mentionProcessor,
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fullIssuePatternProcessor,
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issueIndexPatternProcessor,
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crossReferenceIssueIndexPatternProcessor,
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fullSha1PatternProcessor,
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sha1CurrentPatternProcessor,
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emailAddressProcessor,
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linkProcessor,
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}
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// RenderCommitMessage will use the same logic as PostProcess, but will disable
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// the shortLinkProcessor and will add a defaultLinkProcessor if defaultLink is
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// set, which changes every text node into a link to the passed default link.
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func RenderCommitMessage(
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rawHTML []byte,
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urlPrefix, defaultLink string,
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metas map[string]string,
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) ([]byte, error) {
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ctx := &postProcessCtx{
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metas: metas,
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urlPrefix: urlPrefix,
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procs: commitMessageProcessors,
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}
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if defaultLink != "" {
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// we don't have to fear data races, because being
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// commitMessageProcessors of fixed len and cap, every time we append
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// something to it the slice is realloc+copied, so append always
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// generates the slice ex-novo.
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ctx.procs = append(ctx.procs, genDefaultLinkProcessor(defaultLink))
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}
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return ctx.postProcess(rawHTML)
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}
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var byteBodyTag = []byte("<body>")
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var byteBodyTagClosing = []byte("</body>")
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func (ctx *postProcessCtx) postProcess(rawHTML []byte) ([]byte, error) {
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if ctx.procs == nil {
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ctx.procs = defaultProcessors
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}
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// give a generous extra 50 bytes
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res := make([]byte, 0, len(rawHTML)+50)
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res = append(res, byteBodyTag...)
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res = append(res, rawHTML...)
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res = append(res, byteBodyTagClosing...)
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// parse the HTML
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nodes, err := html.ParseFragment(bytes.NewReader(res), nil)
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if err != nil {
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return nil, &postProcessError{"invalid HTML", err}
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}
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for _, node := range nodes {
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ctx.visitNode(node)
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}
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// Create buffer in which the data will be placed again. We know that the
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// length will be at least that of res; to spare a few alloc+copy, we
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// reuse res, resetting its length to 0.
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buf := bytes.NewBuffer(res[:0])
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// Render everything to buf.
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for _, node := range nodes {
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err = html.Render(buf, node)
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if err != nil {
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return nil, &postProcessError{"error rendering processed HTML", err}
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}
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}
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// remove initial parts - because Render creates a whole HTML page.
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res = buf.Bytes()
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res = res[bytes.Index(res, byteBodyTag)+len(byteBodyTag) : bytes.LastIndex(res, byteBodyTagClosing)]
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// Everything done successfully, return parsed data.
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return res, nil
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}
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func (ctx *postProcessCtx) visitNode(node *html.Node) {
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// We ignore code, pre and already generated links.
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switch node.Type {
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case html.TextNode:
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ctx.textNode(node)
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case html.ElementNode:
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if node.Data == "a" || node.Data == "code" || node.Data == "pre" {
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if node.Data == "a" && ctx.visitLinksForShortLinks {
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ctx.visitNodeForShortLinks(node)
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}
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return
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}
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for n := node.FirstChild; n != nil; n = n.NextSibling {
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ctx.visitNode(n)
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}
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}
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// ignore everything else
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}
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func (ctx *postProcessCtx) visitNodeForShortLinks(node *html.Node) {
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switch node.Type {
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case html.TextNode:
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shortLinkProcessorFull(ctx, node, true)
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case html.ElementNode:
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if node.Data == "code" || node.Data == "pre" {
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return
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}
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for n := node.FirstChild; n != nil; n = n.NextSibling {
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ctx.visitNodeForShortLinks(n)
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}
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}
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}
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// textNode runs the passed node through various processors, in order to handle
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// all kinds of special links handled by the post-processing.
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func (ctx *postProcessCtx) textNode(node *html.Node) {
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for _, processor := range ctx.procs {
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processor(ctx, node)
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}
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}
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func createLink(href, content string) *html.Node {
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textNode := &html.Node{
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Type: html.TextNode,
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Data: content,
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}
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linkNode := &html.Node{
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FirstChild: textNode,
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LastChild: textNode,
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Type: html.ElementNode,
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Data: "a",
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DataAtom: atom.A,
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Attr: []html.Attribute{
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{Key: "href", Val: href},
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},
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}
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textNode.Parent = linkNode
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return linkNode
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}
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// replaceContent takes a text node, and in its content it replaces a section of
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// it with the specified newNode. An example to visualize how this can work can
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// be found here: https://play.golang.org/p/5zP8NnHZ03s
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func replaceContent(node *html.Node, i, j int, newNode *html.Node) {
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// get the data before and after the match
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before := node.Data[:i]
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after := node.Data[j:]
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// Replace in the current node the text, so that it is only what it is
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// supposed to have.
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node.Data = before
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// Get the current next sibling, before which we place the replaced data,
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// and after that we place the new text node.
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nextSibling := node.NextSibling
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node.Parent.InsertBefore(newNode, nextSibling)
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if after != "" {
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node.Parent.InsertBefore(&html.Node{
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Type: html.TextNode,
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Data: after,
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}, nextSibling)
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}
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}
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func mentionProcessor(_ *postProcessCtx, node *html.Node) {
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m := mentionPattern.FindStringSubmatchIndex(node.Data)
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if m == nil {
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return
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}
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// Replace the mention with a link to the specified user.
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mention := node.Data[m[2]:m[3]]
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replaceContent(node, m[2], m[3], createLink(util.URLJoin(setting.AppURL, mention[1:]), mention))
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}
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func shortLinkProcessor(ctx *postProcessCtx, node *html.Node) {
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shortLinkProcessorFull(ctx, node, false)
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}
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func shortLinkProcessorFull(ctx *postProcessCtx, node *html.Node, noLink bool) {
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m := shortLinkPattern.FindStringSubmatchIndex(node.Data)
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if m == nil {
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return
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}
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content := node.Data[m[2]:m[3]]
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tail := node.Data[m[4]:m[5]]
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props := make(map[string]string)
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// MediaWiki uses [[link|text]], while GitHub uses [[text|link]]
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// It makes page handling terrible, but we prefer GitHub syntax
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// And fall back to MediaWiki only when it is obvious from the look
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// Of text and link contents
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sl := strings.Split(content, "|")
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for _, v := range sl {
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if equalPos := strings.IndexByte(v, '='); equalPos == -1 {
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// There is no equal in this argument; this is a mandatory arg
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if props["name"] == "" {
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if isLinkStr(v) {
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// If we clearly see it is a link, we save it so
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// But first we need to ensure, that if both mandatory args provided
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// look like links, we stick to GitHub syntax
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if props["link"] != "" {
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props["name"] = props["link"]
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}
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props["link"] = strings.TrimSpace(v)
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} else {
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props["name"] = v
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}
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} else {
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props["link"] = strings.TrimSpace(v)
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}
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} else {
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// There is an equal; optional argument.
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sep := strings.IndexByte(v, '=')
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key, val := v[:sep], html.UnescapeString(v[sep+1:])
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// When parsing HTML, x/net/html will change all quotes which are
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// not used for syntax into UTF-8 quotes. So checking val[0] won't
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// be enough, since that only checks a single byte.
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if (strings.HasPrefix(val, "“") && strings.HasSuffix(val, "”")) ||
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(strings.HasPrefix(val, "‘") && strings.HasSuffix(val, "’")) {
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const lenQuote = len("‘")
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val = val[lenQuote : len(val)-lenQuote]
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}
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props[key] = val
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}
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}
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var name, link string
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if props["link"] != "" {
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link = props["link"]
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} else if props["name"] != "" {
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link = props["name"]
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}
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if props["title"] != "" {
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name = props["title"]
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} else if props["name"] != "" {
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name = props["name"]
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} else {
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name = link
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}
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name += tail
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image := false
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switch ext := filepath.Ext(string(link)); ext {
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// fast path: empty string, ignore
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case "":
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break
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case ".jpg", ".jpeg", ".png", ".tif", ".tiff", ".webp", ".gif", ".bmp", ".ico", ".svg":
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image = true
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}
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childNode := &html.Node{}
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linkNode := &html.Node{
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FirstChild: childNode,
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LastChild: childNode,
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Type: html.ElementNode,
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Data: "a",
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DataAtom: atom.A,
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}
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childNode.Parent = linkNode
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absoluteLink := isLinkStr(link)
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if !absoluteLink {
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if image {
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link = strings.Replace(link, " ", "+", -1)
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} else {
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link = strings.Replace(link, " ", "-", -1)
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}
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if !strings.Contains(link, "/") {
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link = url.PathEscape(link)
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}
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}
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urlPrefix := ctx.urlPrefix
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if image {
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if !absoluteLink {
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if IsSameDomain(urlPrefix) {
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urlPrefix = strings.Replace(urlPrefix, "/src/", "/raw/", 1)
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}
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if ctx.isWikiMarkdown {
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link = util.URLJoin("wiki", "raw", link)
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}
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link = util.URLJoin(urlPrefix, link)
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}
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title := props["title"]
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if title == "" {
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title = props["alt"]
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}
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if title == "" {
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title = path.Base(string(name))
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}
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alt := props["alt"]
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if alt == "" {
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alt = name
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}
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// make the childNode an image - if we can, we also place the alt
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childNode.Type = html.ElementNode
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childNode.Data = "img"
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childNode.DataAtom = atom.Img
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childNode.Attr = []html.Attribute{
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||
{Key: "src", Val: link},
|
||
{Key: "title", Val: title},
|
||
{Key: "alt", Val: alt},
|
||
}
|
||
if alt == "" {
|
||
childNode.Attr = childNode.Attr[:2]
|
||
}
|
||
} else {
|
||
if !absoluteLink {
|
||
if ctx.isWikiMarkdown {
|
||
link = util.URLJoin("wiki", link)
|
||
}
|
||
link = util.URLJoin(urlPrefix, link)
|
||
}
|
||
childNode.Type = html.TextNode
|
||
childNode.Data = name
|
||
}
|
||
if noLink {
|
||
linkNode = childNode
|
||
} else {
|
||
linkNode.Attr = []html.Attribute{{Key: "href", Val: link}}
|
||
}
|
||
replaceContent(node, m[0], m[1], linkNode)
|
||
}
|
||
|
||
func fullIssuePatternProcessor(ctx *postProcessCtx, node *html.Node) {
|
||
m := getIssueFullPattern().FindStringSubmatchIndex(node.Data)
|
||
if m == nil {
|
||
return
|
||
}
|
||
link := node.Data[m[0]:m[1]]
|
||
id := "#" + node.Data[m[2]:m[3]]
|
||
// TODO if m[4]:m[5] is not nil, then link is to a comment,
|
||
// and we should indicate that in the text somehow
|
||
replaceContent(node, m[0], m[1], createLink(link, id))
|
||
}
|
||
|
||
func issueIndexPatternProcessor(ctx *postProcessCtx, node *html.Node) {
|
||
prefix := cutoutVerbosePrefix(ctx.urlPrefix)
|
||
|
||
// default to numeric pattern, unless alphanumeric is requested.
|
||
pattern := issueNumericPattern
|
||
if ctx.metas["style"] == IssueNameStyleAlphanumeric {
|
||
pattern = issueAlphanumericPattern
|
||
}
|
||
|
||
match := pattern.FindStringSubmatchIndex(node.Data)
|
||
if match == nil {
|
||
return
|
||
}
|
||
id := node.Data[match[2]:match[3]]
|
||
var link *html.Node
|
||
if ctx.metas == nil {
|
||
link = createLink(util.URLJoin(prefix, "issues", id[1:]), id)
|
||
} else {
|
||
// Support for external issue tracker
|
||
if ctx.metas["style"] == IssueNameStyleAlphanumeric {
|
||
ctx.metas["index"] = id
|
||
} else {
|
||
ctx.metas["index"] = id[1:]
|
||
}
|
||
link = createLink(com.Expand(ctx.metas["format"], ctx.metas), id)
|
||
}
|
||
replaceContent(node, match[2], match[3], link)
|
||
}
|
||
|
||
func crossReferenceIssueIndexPatternProcessor(ctx *postProcessCtx, node *html.Node) {
|
||
m := crossReferenceIssueNumericPattern.FindStringSubmatchIndex(node.Data)
|
||
if m == nil {
|
||
return
|
||
}
|
||
ref := node.Data[m[2]:m[3]]
|
||
|
||
parts := strings.SplitN(ref, "#", 2)
|
||
repo, issue := parts[0], parts[1]
|
||
|
||
replaceContent(node, m[2], m[3],
|
||
createLink(util.URLJoin(setting.AppURL, repo, "issues", issue), ref))
|
||
}
|
||
|
||
// fullSha1PatternProcessor renders SHA containing URLs
|
||
func fullSha1PatternProcessor(ctx *postProcessCtx, node *html.Node) {
|
||
m := anySHA1Pattern.FindStringSubmatchIndex(node.Data)
|
||
if m == nil {
|
||
return
|
||
}
|
||
// take out what's relevant
|
||
urlFull := node.Data[m[0]:m[1]]
|
||
hash := node.Data[m[2]:m[3]]
|
||
|
||
var subtree, line string
|
||
|
||
// optional, we do them depending on the length.
|
||
if m[7] > 0 {
|
||
line = node.Data[m[6]:m[7]]
|
||
}
|
||
if m[5] > 0 {
|
||
subtree = node.Data[m[4]:m[5]]
|
||
}
|
||
|
||
text := base.ShortSha(hash)
|
||
if subtree != "" {
|
||
text += "/" + subtree
|
||
}
|
||
if line != "" {
|
||
text += " ("
|
||
text += line
|
||
text += ")"
|
||
}
|
||
|
||
replaceContent(node, m[0], m[1], createLink(urlFull, text))
|
||
}
|
||
|
||
// sha1CurrentPatternProcessor renders SHA1 strings to corresponding links that
|
||
// are assumed to be in the same repository.
|
||
func sha1CurrentPatternProcessor(ctx *postProcessCtx, node *html.Node) {
|
||
m := sha1CurrentPattern.FindStringSubmatchIndex(node.Data)
|
||
if m == nil {
|
||
return
|
||
}
|
||
hash := node.Data[m[2]:m[3]]
|
||
// The regex does not lie, it matches the hash pattern.
|
||
// However, a regex cannot know if a hash actually exists or not.
|
||
// We could assume that a SHA1 hash should probably contain alphas AND numerics
|
||
// but that is not always the case.
|
||
// Although unlikely, deadbeef and 1234567 are valid short forms of SHA1 hash
|
||
// as used by git and github for linking and thus we have to do similar.
|
||
replaceContent(node, m[2], m[3],
|
||
createLink(util.URLJoin(ctx.urlPrefix, "commit", hash), base.ShortSha(hash)))
|
||
}
|
||
|
||
// emailAddressProcessor replaces raw email addresses with a mailto: link.
|
||
func emailAddressProcessor(ctx *postProcessCtx, node *html.Node) {
|
||
m := emailRegex.FindStringIndex(node.Data)
|
||
if m == nil {
|
||
return
|
||
}
|
||
mail := node.Data[m[0]:m[1]]
|
||
replaceContent(node, m[0], m[1], createLink("mailto:"+mail, mail))
|
||
}
|
||
|
||
// linkProcessor creates links for any HTTP or HTTPS URL not captured by
|
||
// markdown.
|
||
func linkProcessor(ctx *postProcessCtx, node *html.Node) {
|
||
m := linkRegex.FindStringIndex(node.Data)
|
||
if m == nil {
|
||
return
|
||
}
|
||
uri := node.Data[m[0]:m[1]]
|
||
replaceContent(node, m[0], m[1], createLink(uri, uri))
|
||
}
|
||
|
||
func genDefaultLinkProcessor(defaultLink string) processor {
|
||
return func(ctx *postProcessCtx, node *html.Node) {
|
||
ch := &html.Node{
|
||
Parent: node,
|
||
Type: html.TextNode,
|
||
Data: node.Data,
|
||
}
|
||
|
||
node.Type = html.ElementNode
|
||
node.Data = "a"
|
||
node.DataAtom = atom.A
|
||
node.Attr = []html.Attribute{{Key: "href", Val: defaultLink}}
|
||
node.FirstChild, node.LastChild = ch, ch
|
||
}
|
||
}
|