323 lines
10 KiB
Go
323 lines
10 KiB
Go
// Copyright 2019 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 references
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import (
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"net/url"
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"regexp"
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"strconv"
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"strings"
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"sync"
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"code.gitea.io/gitea/modules/markup/mdstripper"
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"code.gitea.io/gitea/modules/setting"
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)
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var (
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// validNamePattern performs only the most basic validation for user or repository names
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// Repository name should contain only alphanumeric, dash ('-'), underscore ('_') and dot ('.') characters.
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validNamePattern = regexp.MustCompile(`^[a-z0-9_.-]+$`)
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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|^|\(|\[)(@[0-9a-zA-Z-_\.]+)(?:\s|$|\)|\])`)
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// issueNumericPattern matches string that references to a numeric issue, e.g. #1287
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issueNumericPattern = regexp.MustCompile(`(?:\s|^|\(|\[)(#[0-9]+)(?:\s|$|\)|\]|:|\.(\s|$))`)
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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|^|\(|\[)([A-Z]{1,10}-[1-9][0-9]*)(?:\s|$|\)|\]|:|\.(\s|$))`)
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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|^|\(|\[)([0-9a-zA-Z-_\.]+/[0-9a-zA-Z-_\.]+#[0-9]+)(?:\s|$|\)|\]|\.(\s|$))`)
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// Same as GitHub. See
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// https://help.github.com/articles/closing-issues-via-commit-messages
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issueCloseKeywords = []string{"close", "closes", "closed", "fix", "fixes", "fixed", "resolve", "resolves", "resolved"}
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issueReopenKeywords = []string{"reopen", "reopens", "reopened"}
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issueCloseKeywordsPat, issueReopenKeywordsPat *regexp.Regexp
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giteaHostInit sync.Once
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giteaHost string
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)
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// XRefAction represents the kind of effect a cross reference has once is resolved
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type XRefAction int64
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const (
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// XRefActionNone means the cross-reference is simply a comment
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XRefActionNone XRefAction = iota // 0
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// XRefActionCloses means the cross-reference should close an issue if it is resolved
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XRefActionCloses // 1
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// XRefActionReopens means the cross-reference should reopen an issue if it is resolved
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XRefActionReopens // 2
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// XRefActionNeutered means the cross-reference will no longer affect the source
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XRefActionNeutered // 3
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)
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// IssueReference contains an unverified cross-reference to a local issue or pull request
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type IssueReference struct {
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Index int64
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Owner string
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Name string
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Action XRefAction
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}
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// RenderizableReference contains an unverified cross-reference to with rendering information
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type RenderizableReference struct {
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Issue string
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Owner string
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Name string
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RefLocation *RefSpan
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Action XRefAction
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ActionLocation *RefSpan
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}
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type rawReference struct {
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index int64
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owner string
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name string
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action XRefAction
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issue string
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refLocation *RefSpan
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actionLocation *RefSpan
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}
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func rawToIssueReferenceList(reflist []*rawReference) []IssueReference {
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refarr := make([]IssueReference, len(reflist))
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for i, r := range reflist {
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refarr[i] = IssueReference{
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Index: r.index,
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Owner: r.owner,
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Name: r.name,
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Action: r.action,
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}
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}
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return refarr
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}
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// RefSpan is the position where the reference was found within the parsed text
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type RefSpan struct {
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Start int
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End int
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}
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func makeKeywordsPat(keywords []string) *regexp.Regexp {
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return regexp.MustCompile(`(?i)(?:\s|^|\(|\[)(` + strings.Join(keywords, `|`) + `):? $`)
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}
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func init() {
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issueCloseKeywordsPat = makeKeywordsPat(issueCloseKeywords)
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issueReopenKeywordsPat = makeKeywordsPat(issueReopenKeywords)
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}
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// getGiteaHostName returns a normalized string with the local host name, with no scheme or port information
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func getGiteaHostName() string {
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giteaHostInit.Do(func() {
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if uapp, err := url.Parse(setting.AppURL); err == nil {
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giteaHost = strings.ToLower(uapp.Host)
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} else {
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giteaHost = ""
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}
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})
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return giteaHost
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}
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// FindAllMentionsMarkdown matches mention patterns in given content and
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// returns a list of found unvalidated user names **not including** the @ prefix.
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func FindAllMentionsMarkdown(content string) []string {
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bcontent, _ := mdstripper.StripMarkdownBytes([]byte(content))
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locations := FindAllMentionsBytes(bcontent)
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mentions := make([]string, len(locations))
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for i, val := range locations {
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mentions[i] = string(bcontent[val.Start+1 : val.End])
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}
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return mentions
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}
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// FindAllMentionsBytes matches mention patterns in given content
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// and returns a list of locations for the unvalidated user names, including the @ prefix.
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func FindAllMentionsBytes(content []byte) []RefSpan {
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mentions := mentionPattern.FindAllSubmatchIndex(content, -1)
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ret := make([]RefSpan, len(mentions))
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for i, val := range mentions {
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ret[i] = RefSpan{Start: val[2], End: val[3]}
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}
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return ret
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}
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// FindFirstMentionBytes matches the first mention in then given content
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// and returns the location of the unvalidated user name, including the @ prefix.
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func FindFirstMentionBytes(content []byte) (bool, RefSpan) {
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mention := mentionPattern.FindSubmatchIndex(content)
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if mention == nil {
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return false, RefSpan{}
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}
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return true, RefSpan{Start: mention[2], End: mention[3]}
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}
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// FindAllIssueReferencesMarkdown strips content from markdown markup
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// and returns a list of unvalidated references found in it.
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func FindAllIssueReferencesMarkdown(content string) []IssueReference {
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return rawToIssueReferenceList(findAllIssueReferencesMarkdown(content))
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}
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func findAllIssueReferencesMarkdown(content string) []*rawReference {
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bcontent, links := mdstripper.StripMarkdownBytes([]byte(content))
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return findAllIssueReferencesBytes(bcontent, links)
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}
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// FindAllIssueReferences returns a list of unvalidated references found in a string.
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func FindAllIssueReferences(content string) []IssueReference {
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return rawToIssueReferenceList(findAllIssueReferencesBytes([]byte(content), []string{}))
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}
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// FindRenderizableReferenceNumeric returns the first unvalidated reference found in a string.
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func FindRenderizableReferenceNumeric(content string) (bool, *RenderizableReference) {
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match := issueNumericPattern.FindStringSubmatchIndex(content)
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if match == nil {
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if match = crossReferenceIssueNumericPattern.FindStringSubmatchIndex(content); match == nil {
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return false, nil
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}
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}
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r := getCrossReference([]byte(content), match[2], match[3], false)
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if r == nil {
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return false, nil
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}
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return true, &RenderizableReference{
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Issue: r.issue,
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Owner: r.owner,
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Name: r.name,
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RefLocation: r.refLocation,
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Action: r.action,
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ActionLocation: r.actionLocation,
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}
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}
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// FindRenderizableReferenceAlphanumeric returns the first alphanumeric unvalidated references found in a string.
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func FindRenderizableReferenceAlphanumeric(content string) (bool, *RenderizableReference) {
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match := issueAlphanumericPattern.FindStringSubmatchIndex(content)
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if match == nil {
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return false, nil
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}
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action, location := findActionKeywords([]byte(content), match[2])
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return true, &RenderizableReference{
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Issue: string(content[match[2]:match[3]]),
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RefLocation: &RefSpan{Start: match[2], End: match[3]},
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Action: action,
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ActionLocation: location,
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}
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}
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// FindAllIssueReferencesBytes returns a list of unvalidated references found in a byte slice.
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func findAllIssueReferencesBytes(content []byte, links []string) []*rawReference {
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ret := make([]*rawReference, 0, 10)
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matches := issueNumericPattern.FindAllSubmatchIndex(content, -1)
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for _, match := range matches {
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if ref := getCrossReference(content, match[2], match[3], false); ref != nil {
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ret = append(ret, ref)
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}
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}
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matches = crossReferenceIssueNumericPattern.FindAllSubmatchIndex(content, -1)
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for _, match := range matches {
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if ref := getCrossReference(content, match[2], match[3], false); ref != nil {
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ret = append(ret, ref)
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}
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}
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localhost := getGiteaHostName()
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for _, link := range links {
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if u, err := url.Parse(link); err == nil {
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// Note: we're not attempting to match the URL scheme (http/https)
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host := strings.ToLower(u.Host)
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if host != "" && host != localhost {
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continue
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}
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parts := strings.Split(u.EscapedPath(), "/")
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// /user/repo/issues/3
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if len(parts) != 5 || parts[0] != "" {
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continue
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}
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if parts[3] != "issues" && parts[3] != "pulls" {
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continue
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}
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// Note: closing/reopening keywords not supported with URLs
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bytes := []byte(parts[1] + "/" + parts[2] + "#" + parts[4])
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if ref := getCrossReference(bytes, 0, len(bytes), true); ref != nil {
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ref.refLocation = nil
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ret = append(ret, ref)
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}
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}
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}
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return ret
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}
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func getCrossReference(content []byte, start, end int, fromLink bool) *rawReference {
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refid := string(content[start:end])
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parts := strings.Split(refid, "#")
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if len(parts) != 2 {
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return nil
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}
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repo, issue := parts[0], parts[1]
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index, err := strconv.ParseInt(issue, 10, 64)
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if err != nil {
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return nil
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}
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if repo == "" {
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if fromLink {
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// Markdown links must specify owner/repo
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return nil
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}
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action, location := findActionKeywords(content, start)
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return &rawReference{
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index: index,
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action: action,
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issue: issue,
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refLocation: &RefSpan{Start: start, End: end},
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actionLocation: location,
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}
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}
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parts = strings.Split(strings.ToLower(repo), "/")
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if len(parts) != 2 {
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return nil
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}
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owner, name := parts[0], parts[1]
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if !validNamePattern.MatchString(owner) || !validNamePattern.MatchString(name) {
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return nil
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}
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action, location := findActionKeywords(content, start)
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return &rawReference{
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index: index,
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owner: owner,
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name: name,
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action: action,
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issue: issue,
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refLocation: &RefSpan{Start: start, End: end},
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actionLocation: location,
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}
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}
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func findActionKeywords(content []byte, start int) (XRefAction, *RefSpan) {
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m := issueCloseKeywordsPat.FindSubmatchIndex(content[:start])
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if m != nil {
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return XRefActionCloses, &RefSpan{Start: m[2], End: m[3]}
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}
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m = issueReopenKeywordsPat.FindSubmatchIndex(content[:start])
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if m != nil {
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return XRefActionReopens, &RefSpan{Start: m[2], End: m[3]}
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}
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return XRefActionNone, nil
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}
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