mirror of
https://github.com/go-gitea/gitea
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145e266987
Many existing tests were quite hacky, these could be improved later. <details>  </details>
495 lines
14 KiB
Go
495 lines
14 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package markup
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import (
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"bytes"
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"io"
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"regexp"
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"strings"
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"sync"
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"code.gitea.io/gitea/modules/markup/common"
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"code.gitea.io/gitea/modules/setting"
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"golang.org/x/net/html"
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"golang.org/x/net/html/atom"
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"mvdan.cc/xurls/v2"
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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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IssueNameStyleRegexp = "regexp"
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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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// valid chars in encoded path and parameter: [-+~_%.a-zA-Z0-9/]
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// hashCurrentPattern matches string that represents a commit SHA, e.g. d8a994ef243349f321568f9e36d5c3f444b99cae
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// Although SHA1 hashes are 40 chars long, SHA256 are 64, the regex matches the hash from 7 to 64 chars in length
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// so that abbreviated hash links can be used as well. This matches git and GitHub usability.
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hashCurrentPattern = regexp.MustCompile(`(?:\s|^|\(|\[)([0-9a-f]{7,64})(?:\s|$|\)|\]|[.,:](\s|$))`)
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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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// anyHashPattern splits url containing SHA into parts
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anyHashPattern = regexp.MustCompile(`https?://(?:\S+/){4,5}([0-9a-f]{40,64})(/[-+~%./\w]+)?(\?[-+~%.\w&=]+)?(#[-+~%.\w]+)?`)
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// comparePattern matches "http://domain/org/repo/compare/COMMIT1...COMMIT2#hash"
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comparePattern = regexp.MustCompile(`https?://(?:\S+/){4,5}([0-9a-f]{7,64})(\.\.\.?)([0-9a-f]{7,64})?(#[-+~_%.a-zA-Z0-9]+)?`)
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// fullURLPattern matches full URL like "mailto:...", "https://..." and "ssh+git://..."
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fullURLPattern = regexp.MustCompile(`^[a-z][-+\w]+:`)
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// emailRegex is definitely not perfect with edge cases,
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// it is still accepted by the CommonMark specification, as 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("(?:\\s|^|\\(|\\[)([a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9]{2,}(?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+)(?:\\s|$|\\)|\\]|;|,|\\?|!|\\.(\\s|$))")
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// blackfridayExtRegex is for blackfriday extensions create IDs like fn:user-content-footnote
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blackfridayExtRegex = regexp.MustCompile(`[^:]*:user-content-`)
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// emojiShortCodeRegex find emoji by alias like :smile:
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emojiShortCodeRegex = regexp.MustCompile(`:[-+\w]+:`)
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)
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// CSS class for action keywords (e.g. "closes: #1")
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const keywordClass = "issue-keyword"
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// IsFullURLBytes reports whether link fits valid format.
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func IsFullURLBytes(link []byte) bool {
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return fullURLPattern.Match(link)
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}
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func IsFullURLString(link string) bool {
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return fullURLPattern.MatchString(link)
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}
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func IsNonEmptyRelativePath(link string) bool {
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return link != "" && !IsFullURLString(link) && link[0] != '/' && link[0] != '?' && link[0] != '#'
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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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// Once for to prevent races
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var issueFullPatternOnce sync.Once
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// regexp for full links to hash comment in pull request files changed tab
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var filesChangedFullPattern *regexp.Regexp
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// Once for to prevent races
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var filesChangedFullPatternOnce sync.Once
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func getIssueFullPattern() *regexp.Regexp {
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issueFullPatternOnce.Do(func() {
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// example: https://domain/org/repo/pulls/27#hash
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issueFullPattern = regexp.MustCompile(regexp.QuoteMeta(setting.AppURL) +
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`[\w_.-]+/[\w_.-]+/(?:issues|pulls)/((?:\w{1,10}-)?[1-9][0-9]*)([\?|#](\S+)?)?\b`)
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})
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return issueFullPattern
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}
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func getFilesChangedFullPattern() *regexp.Regexp {
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filesChangedFullPatternOnce.Do(func() {
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// example: https://domain/org/repo/pulls/27/files#hash
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filesChangedFullPattern = regexp.MustCompile(regexp.QuoteMeta(setting.AppURL) +
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`[\w_.-]+/[\w_.-]+/pulls/((?:\w{1,10}-)?[1-9][0-9]*)/files([\?|#](\S+)?)?\b`)
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})
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return filesChangedFullPattern
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}
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// CustomLinkURLSchemes allows for additional schemes to be detected when parsing links within text
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func CustomLinkURLSchemes(schemes []string) {
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schemes = append(schemes, "http", "https")
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withAuth := make([]string, 0, len(schemes))
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validScheme := regexp.MustCompile(`^[a-z]+$`)
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for _, s := range schemes {
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if !validScheme.MatchString(s) {
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continue
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}
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without := false
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for _, sna := range xurls.SchemesNoAuthority {
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if s == sna {
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without = true
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break
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}
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}
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if without {
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s += ":"
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} else {
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s += "://"
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}
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withAuth = append(withAuth, s)
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}
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common.LinkRegex, _ = xurls.StrictMatchingScheme(strings.Join(withAuth, "|"))
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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.err.Error()
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}
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type processor func(ctx *RenderContext, node *html.Node)
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var defaultProcessors = []processor{
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fullIssuePatternProcessor,
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comparePatternProcessor,
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codePreviewPatternProcessor,
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fullHashPatternProcessor,
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shortLinkProcessor,
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linkProcessor,
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mentionProcessor,
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issueIndexPatternProcessor,
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commitCrossReferencePatternProcessor,
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hashCurrentPatternProcessor,
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emailAddressProcessor,
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emojiProcessor,
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emojiShortCodeProcessor,
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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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ctx *RenderContext,
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input io.Reader,
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output io.Writer,
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) error {
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return postProcess(ctx, defaultProcessors, input, output)
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}
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var commitMessageProcessors = []processor{
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fullIssuePatternProcessor,
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comparePatternProcessor,
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fullHashPatternProcessor,
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linkProcessor,
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mentionProcessor,
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issueIndexPatternProcessor,
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commitCrossReferencePatternProcessor,
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hashCurrentPatternProcessor,
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emailAddressProcessor,
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emojiProcessor,
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emojiShortCodeProcessor,
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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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ctx *RenderContext,
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content string,
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) (string, error) {
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procs := commitMessageProcessors
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if ctx.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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procs = append(procs, genDefaultLinkProcessor(ctx.DefaultLink))
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}
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return renderProcessString(ctx, procs, content)
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}
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var commitMessageSubjectProcessors = []processor{
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fullIssuePatternProcessor,
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comparePatternProcessor,
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fullHashPatternProcessor,
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linkProcessor,
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mentionProcessor,
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issueIndexPatternProcessor,
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commitCrossReferencePatternProcessor,
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hashCurrentPatternProcessor,
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emojiShortCodeProcessor,
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emojiProcessor,
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}
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var emojiProcessors = []processor{
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emojiShortCodeProcessor,
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emojiProcessor,
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}
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// RenderCommitMessageSubject will use the same logic as PostProcess and
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// RenderCommitMessage, but will disable the shortLinkProcessor and
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// emailAddressProcessor, will add a defaultLinkProcessor if defaultLink is set,
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// which changes every text node into a link to the passed default link.
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func RenderCommitMessageSubject(
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ctx *RenderContext,
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content string,
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) (string, error) {
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procs := commitMessageSubjectProcessors
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if ctx.DefaultLink != "" {
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// we don't have to fear data races, because being
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// commitMessageSubjectProcessors of fixed len and cap, every time we
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// append something to it the slice is realloc+copied, so append always
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// generates the slice ex-novo.
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procs = append(procs, genDefaultLinkProcessor(ctx.DefaultLink))
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}
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return renderProcessString(ctx, procs, content)
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}
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// RenderIssueTitle to process title on individual issue/pull page
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func RenderIssueTitle(
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ctx *RenderContext,
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title string,
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) (string, error) {
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return renderProcessString(ctx, []processor{
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issueIndexPatternProcessor,
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commitCrossReferencePatternProcessor,
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hashCurrentPatternProcessor,
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emojiShortCodeProcessor,
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emojiProcessor,
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}, title)
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}
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func renderProcessString(ctx *RenderContext, procs []processor, content string) (string, error) {
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var buf strings.Builder
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if err := postProcess(ctx, procs, strings.NewReader(content), &buf); err != nil {
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return "", err
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}
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return buf.String(), nil
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}
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// RenderDescriptionHTML will use similar logic as PostProcess, but will
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// use a single special linkProcessor.
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func RenderDescriptionHTML(
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ctx *RenderContext,
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content string,
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) (string, error) {
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return renderProcessString(ctx, []processor{
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descriptionLinkProcessor,
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emojiShortCodeProcessor,
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emojiProcessor,
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}, content)
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}
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// RenderEmoji for when we want to just process emoji and shortcodes
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// in various places it isn't already run through the normal markdown processor
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func RenderEmoji(
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ctx *RenderContext,
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content string,
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) (string, error) {
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return renderProcessString(ctx, emojiProcessors, content)
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}
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var (
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tagCleaner = regexp.MustCompile(`<((?:/?\w+/\w+)|(?:/[\w ]+/)|(/?[hH][tT][mM][lL]\b)|(/?[hH][eE][aA][dD]\b))`)
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nulCleaner = strings.NewReplacer("\000", "")
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)
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func postProcess(ctx *RenderContext, procs []processor, input io.Reader, output io.Writer) error {
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defer ctx.Cancel()
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// FIXME: don't read all content to memory
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rawHTML, err := io.ReadAll(input)
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if err != nil {
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return err
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}
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// parse the HTML
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node, err := html.Parse(io.MultiReader(
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// prepend "<html><body>"
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strings.NewReader("<html><body>"),
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// Strip out nuls - they're always invalid
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bytes.NewReader(tagCleaner.ReplaceAll([]byte(nulCleaner.Replace(string(rawHTML))), []byte("<$1"))),
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// close the tags
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strings.NewReader("</body></html>"),
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))
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if err != nil {
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return &postProcessError{"invalid HTML", err}
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}
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if node.Type == html.DocumentNode {
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node = node.FirstChild
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}
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visitNode(ctx, procs, node)
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newNodes := make([]*html.Node, 0, 5)
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if node.Data == "html" {
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node = node.FirstChild
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for node != nil && node.Data != "body" {
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node = node.NextSibling
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}
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}
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if node != nil {
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if node.Data == "body" {
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child := node.FirstChild
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for child != nil {
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newNodes = append(newNodes, child)
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child = child.NextSibling
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}
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} else {
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newNodes = append(newNodes, node)
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}
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}
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// Render everything to buf.
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for _, node := range newNodes {
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if err := html.Render(output, node); err != nil {
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return &postProcessError{"error rendering processed HTML", err}
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}
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}
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return nil
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}
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func visitNode(ctx *RenderContext, procs []processor, node *html.Node) *html.Node {
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// Add user-content- to IDs and "#" links if they don't already have them
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for idx, attr := range node.Attr {
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val := strings.TrimPrefix(attr.Val, "#")
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notHasPrefix := !(strings.HasPrefix(val, "user-content-") || blackfridayExtRegex.MatchString(val))
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if attr.Key == "id" && notHasPrefix {
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node.Attr[idx].Val = "user-content-" + attr.Val
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}
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if attr.Key == "href" && strings.HasPrefix(attr.Val, "#") && notHasPrefix {
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node.Attr[idx].Val = "#user-content-" + val
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}
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if attr.Key == "class" && attr.Val == "emoji" {
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procs = nil
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}
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}
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switch node.Type {
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case html.TextNode:
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processTextNodes(ctx, procs, node)
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case html.ElementNode:
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if node.Data == "code" || node.Data == "pre" {
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// ignore code and pre nodes
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return node.NextSibling
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} else if node.Data == "img" {
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return visitNodeImg(ctx, node)
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} else if node.Data == "video" {
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return visitNodeVideo(ctx, node)
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} else if node.Data == "a" {
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// Restrict text in links to emojis
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procs = emojiProcessors
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} else if node.Data == "i" {
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for _, attr := range node.Attr {
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if attr.Key != "class" {
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continue
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}
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classes := strings.Split(attr.Val, " ")
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for i, class := range classes {
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if class == "icon" {
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classes[0], classes[i] = classes[i], classes[0]
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attr.Val = strings.Join(classes, " ")
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// Remove all children of icons
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child := node.FirstChild
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for child != nil {
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node.RemoveChild(child)
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child = node.FirstChild
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}
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break
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}
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}
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}
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}
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for n := node.FirstChild; n != nil; {
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n = visitNode(ctx, procs, n)
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}
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default:
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}
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return node.NextSibling
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}
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// processTextNodes 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 processTextNodes(ctx *RenderContext, procs []processor, node *html.Node) {
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for _, p := range procs {
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p(ctx, node)
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}
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}
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// createKeyword() renders a highlighted version of an action keyword
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func createKeyword(content string) *html.Node {
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span := &html.Node{
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Type: html.ElementNode,
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Data: atom.Span.String(),
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Attr: []html.Attribute{},
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}
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span.Attr = append(span.Attr, html.Attribute{Key: "class", Val: keywordClass})
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text := &html.Node{
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Type: html.TextNode,
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Data: content,
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}
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span.AppendChild(text)
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return span
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}
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func createLink(href, content, class string) *html.Node {
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a := &html.Node{
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Type: html.ElementNode,
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Data: atom.A.String(),
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Attr: []html.Attribute{
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{Key: "href", Val: href},
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{Key: "data-markdown-generated-content"},
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},
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}
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if class != "" {
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a.Attr = append(a.Attr, html.Attribute{Key: "class", Val: class})
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}
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text := &html.Node{
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Type: html.TextNode,
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Data: content,
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}
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a.AppendChild(text)
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return a
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}
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// replaceContent takes text node, and in its content it replaces a section of
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// it with the specified newNode.
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func replaceContent(node *html.Node, i, j int, newNode *html.Node) {
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replaceContentList(node, i, j, []*html.Node{newNode})
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}
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// replaceContentList takes text node, and in its content it replaces a section of
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// it with the specified newNodes. 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 replaceContentList(node *html.Node, i, j int, newNodes []*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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for _, n := range newNodes {
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node.Parent.InsertBefore(n, nextSibling)
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}
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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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