Detect full references to issues and pulls in commit messages (#12399)

Fix #10269

Signed-off-by: Andrew Thornton <art27@cantab.net>

3 files changed, 200 insertions, 8 deletions

diff --git a/modules/markup/mdstripper/mdstripper.go b/modules/markup/mdstripper/mdstripper.go
index 9d05ee3969..52464f3e1b 100644
--- a/modules/markup/mdstripper/mdstripper.go
+++ b/modules/markup/mdstripper/mdstripper.go
@@ -6,12 +6,15 @@ package mdstripper
 
 import (
 	"bytes"
+	"net/url"
+	"strings"
 	"sync"
 
 	"io"
 
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup/common"
+	"code.gitea.io/gitea/modules/setting"
 
 	"github.com/yuin/goldmark"
 	"github.com/yuin/goldmark/ast"
@@ -22,9 +25,15 @@ import (
 	"github.com/yuin/goldmark/text"
 )
 
+var (
+	giteaHostInit sync.Once
+	giteaHost     *url.URL
+)
+
 type stripRenderer struct {
-	links []string
-	empty bool
+	localhost *url.URL
+	links     []string
+	empty     bool
 }
 
 func (r *stripRenderer) Render(w io.Writer, source []byte, doc ast.Node) error {
@@ -50,7 +59,8 @@ func (r *stripRenderer) Render(w io.Writer, source []byte, doc ast.Node) error {
 			r.processLink(w, v.Destination)
 			return ast.WalkSkipChildren, nil
 		case *ast.AutoLink:
-			r.processLink(w, v.URL(source))
+			// This could be a reference to an issue or pull - if so convert it
+			r.processAutoLink(w, v.URL(source))
 			return ast.WalkSkipChildren, nil
 		}
 		return ast.WalkContinue, nil
@@ -72,6 +82,50 @@ func (r *stripRenderer) processString(w io.Writer, text []byte, coalesce bool) {
 	r.empty = false
 }
 
+// ProcessAutoLinks to detect and handle links to issues and pulls
+func (r *stripRenderer) processAutoLink(w io.Writer, link []byte) {
+	linkStr := string(link)
+	u, err := url.Parse(linkStr)
+	if err != nil {
+		// Process out of band
+		r.links = append(r.links, linkStr)
+		return
+	}
+
+	// Note: we're not attempting to match the URL scheme (http/https)
+	host := strings.ToLower(u.Host)
+	if host != "" && host != strings.ToLower(r.localhost.Host) {
+		// Process out of band
+		r.links = append(r.links, linkStr)
+		return
+	}
+
+	// We want: /user/repo/issues/3
+	parts := strings.Split(strings.TrimPrefix(u.EscapedPath(), r.localhost.EscapedPath()), "/")
+	if len(parts) != 5 || parts[0] != "" {
+		// Process out of band
+		r.links = append(r.links, linkStr)
+		return
+	}
+
+	var sep string
+	if parts[3] == "issues" {
+		sep = "#"
+	} else if parts[3] == "pulls" {
+		sep = "!"
+	} else {
+		// Process out of band
+		r.links = append(r.links, linkStr)
+		return
+	}
+
+	_, _ = w.Write([]byte(parts[1]))
+	_, _ = w.Write([]byte("/"))
+	_, _ = w.Write([]byte(parts[2]))
+	_, _ = w.Write([]byte(sep))
+	_, _ = w.Write([]byte(parts[4]))
+}
+
 func (r *stripRenderer) processLink(w io.Writer, link []byte) {
 	// Links are processed out of band
 	r.links = append(r.links, string(link))
@@ -120,8 +174,9 @@ func StripMarkdownBytes(rawBytes []byte) ([]byte, []string) {
 		stripParser = gdMarkdown.Parser()
 	})
 	stripper := &stripRenderer{
-		links: make([]string, 0, 10),
-		empty: true,
+		localhost: getGiteaHost(),
+		links:     make([]string, 0, 10),
+		empty:     true,
 	}
 	reader := text.NewReader(rawBytes)
 	doc := stripParser.Parse(reader)
@@ -131,3 +186,14 @@ func StripMarkdownBytes(rawBytes []byte) ([]byte, []string) {
 	}
 	return buf.Bytes(), stripper.GetLinks()
 }
+
+// getGiteaHostName returns a normalized string with the local host name, with no scheme or port information
+func getGiteaHost() *url.URL {
+	giteaHostInit.Do(func() {
+		var err error
+		if giteaHost, err = url.Parse(setting.AppURL); err != nil {
+			giteaHost = &url.URL{}
+		}
+	})
+	return giteaHost
+}
diff --git a/modules/references/references.go b/modules/references/references.go
index c9dabb06ba..ce08dcc7ab 100644
--- a/modules/references/references.go
+++ b/modules/references/references.go
@@ -41,8 +41,9 @@ var (
 	issueCloseKeywordsPat, issueReopenKeywordsPat *regexp.Regexp
 	issueKeywordsOnce                             sync.Once
 
-	giteaHostInit sync.Once
-	giteaHost     string
+	giteaHostInit         sync.Once
+	giteaHost             string
+	giteaIssuePullPattern *regexp.Regexp
 )
 
 // XRefAction represents the kind of effect a cross reference has once is resolved
@@ -152,13 +153,25 @@ func getGiteaHostName() string {
 	giteaHostInit.Do(func() {
 		if uapp, err := url.Parse(setting.AppURL); err == nil {
 			giteaHost = strings.ToLower(uapp.Host)
+			giteaIssuePullPattern = regexp.MustCompile(
+				`(\s|^|\(|\[)` +
+					regexp.QuoteMeta(strings.TrimSpace(setting.AppURL)) +
+					`([0-9a-zA-Z-_\.]+/[0-9a-zA-Z-_\.]+)/` +
+					`((?:issues)|(?:pulls))/([0-9]+)(?:\s|$|\)|\]|[:;,.?!]\s|[:;,.?!]$)`)
 		} else {
 			giteaHost = ""
+			giteaIssuePullPattern = nil
 		}
 	})
 	return giteaHost
 }
 
+// getGiteaIssuePullPattern
+func getGiteaIssuePullPattern() *regexp.Regexp {
+	getGiteaHostName()
+	return giteaIssuePullPattern
+}
+
 // FindAllMentionsMarkdown matches mention patterns in given content and
 // returns a list of found unvalidated user names **not including** the @ prefix.
 func FindAllMentionsMarkdown(content string) []string {
@@ -219,7 +232,42 @@ func findAllIssueReferencesMarkdown(content string) []*rawReference {
 
 // FindAllIssueReferences returns a list of unvalidated references found in a string.
 func FindAllIssueReferences(content string) []IssueReference {
-	return rawToIssueReferenceList(findAllIssueReferencesBytes([]byte(content), []string{}))
+	// Need to convert fully qualified html references to local system to #/! short codes
+	contentBytes := []byte(content)
+	if re := getGiteaIssuePullPattern(); re != nil {
+		pos := 0
+		for {
+			match := re.FindSubmatchIndex(contentBytes[pos:])
+			if match == nil {
+				break
+			}
+			// match[0]-match[1] is whole string
+			// match[2]-match[3] is preamble
+			pos += match[3]
+			// match[4]-match[5] is owner/repo
+			endPos := pos + match[5] - match[4]
+			copy(contentBytes[pos:endPos], contentBytes[match[4]:match[5]])
+			pos = endPos
+			// match[6]-match[7] == 'issues'
+			contentBytes[pos] = '#'
+			if string(contentBytes[match[6]:match[7]]) == "pulls" {
+				contentBytes[pos] = '!'
+			}
+			pos++
+			// match[8]-match[9] is the number
+			endPos = pos + match[9] - match[8]
+			copy(contentBytes[pos:endPos], contentBytes[match[8]:match[9]])
+			copy(contentBytes[endPos:], contentBytes[match[9]:])
+			// now we reset the length
+			// our new section has length endPos - match[3]
+			// our old section has length match[9] - match[3]
+			contentBytes = contentBytes[:len(contentBytes)-match[9]+endPos]
+			pos = endPos
+		}
+	} else {
+		log.Debug("No GiteaIssuePullPattern pattern")
+	}
+	return rawToIssueReferenceList(findAllIssueReferencesBytes(contentBytes, []string{}))
 }
 
 // FindRenderizableReferenceNumeric returns the first unvalidated reference found in a string.
diff --git a/modules/repofiles/action_test.go b/modules/repofiles/action_test.go
index 2d659cde23..8ed3ba7b3c 100644
--- a/modules/repofiles/action_test.go
+++ b/modules/repofiles/action_test.go
@@ -10,6 +10,7 @@ import (
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/repository"
+	"code.gitea.io/gitea/modules/setting"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -208,6 +209,32 @@ func TestUpdateIssuesCommit(t *testing.T) {
 	models.AssertExistsAndLoadBean(t, commentBean)
 	models.AssertNotExistsBean(t, issueBean, "is_closed=1")
 	models.CheckConsistencyFor(t, &models.Action{})
+
+	pushCommits = []*repository.PushCommit{
+		{
+			Sha1:           "abcdef3",
+			CommitterEmail: "user2@example.com",
+			CommitterName:  "User Two",
+			AuthorEmail:    "user2@example.com",
+			AuthorName:     "User Two",
+			Message:        "close " + setting.AppURL + repo.FullName() + "/pulls/1",
+		},
+	}
+	repo = models.AssertExistsAndLoadBean(t, &models.Repository{ID: 3}).(*models.Repository)
+	commentBean = &models.Comment{
+		Type:      models.CommentTypeCommitRef,
+		CommitSHA: "abcdef3",
+		PosterID:  user.ID,
+		IssueID:   6,
+	}
+	issueBean = &models.Issue{RepoID: repo.ID, Index: 1}
+
+	models.AssertNotExistsBean(t, commentBean)
+	models.AssertNotExistsBean(t, &models.Issue{RepoID: repo.ID, Index: 1}, "is_closed=1")
+	assert.NoError(t, UpdateIssuesCommit(user, repo, pushCommits, repo.DefaultBranch))
+	models.AssertExistsAndLoadBean(t, commentBean)
+	models.AssertExistsAndLoadBean(t, issueBean, "is_closed=1")
+	models.CheckConsistencyFor(t, &models.Action{})
 }
 
 func TestUpdateIssuesCommit_Colon(t *testing.T) {
@@ -304,6 +331,41 @@ func TestUpdateIssuesCommit_AnotherRepo(t *testing.T) {
 	models.CheckConsistencyFor(t, &models.Action{})
 }
 
+func TestUpdateIssuesCommit_AnotherRepo_FullAddress(t *testing.T) {
+	assert.NoError(t, models.PrepareTestDatabase())
+	user := models.AssertExistsAndLoadBean(t, &models.User{ID: 2}).(*models.User)
+
+	// Test that a push to default branch closes issue in another repo
+	// If the user also has push permissions to that repo
+	pushCommits := []*repository.PushCommit{
+		{
+			Sha1:           "abcdef1",
+			CommitterEmail: "user2@example.com",
+			CommitterName:  "User Two",
+			AuthorEmail:    "user2@example.com",
+			AuthorName:     "User Two",
+			Message:        "close " + setting.AppURL + "user2/repo1/issues/1",
+		},
+	}
+
+	repo := models.AssertExistsAndLoadBean(t, &models.Repository{ID: 2}).(*models.Repository)
+	commentBean := &models.Comment{
+		Type:      models.CommentTypeCommitRef,
+		CommitSHA: "abcdef1",
+		PosterID:  user.ID,
+		IssueID:   1,
+	}
+
+	issueBean := &models.Issue{RepoID: 1, Index: 1, ID: 1}
+
+	models.AssertNotExistsBean(t, commentBean)
+	models.AssertNotExistsBean(t, issueBean, "is_closed=1")
+	assert.NoError(t, UpdateIssuesCommit(user, repo, pushCommits, repo.DefaultBranch))
+	models.AssertExistsAndLoadBean(t, commentBean)
+	models.AssertExistsAndLoadBean(t, issueBean, "is_closed=1")
+	models.CheckConsistencyFor(t, &models.Action{})
+}
+
 func TestUpdateIssuesCommit_AnotherRepoNoPermission(t *testing.T) {
 	assert.NoError(t, models.PrepareTestDatabase())
 	user := models.AssertExistsAndLoadBean(t, &models.User{ID: 10}).(*models.User)
@@ -319,6 +381,14 @@ func TestUpdateIssuesCommit_AnotherRepoNoPermission(t *testing.T) {
 			AuthorName:     "User Ten",
 			Message:        "close user3/repo3#1",
 		},
+		{
+			Sha1:           "abcdef4",
+			CommitterEmail: "user10@example.com",
+			CommitterName:  "User Ten",
+			AuthorEmail:    "user10@example.com",
+			AuthorName:     "User Ten",
+			Message:        "close " + setting.AppURL + "user3/repo3/issues/1",
+		},
 	}
 
 	repo := models.AssertExistsAndLoadBean(t, &models.Repository{ID: 6}).(*models.Repository)
@@ -328,13 +398,21 @@ func TestUpdateIssuesCommit_AnotherRepoNoPermission(t *testing.T) {
 		PosterID:  user.ID,
 		IssueID:   6,
 	}
+	commentBean2 := &models.Comment{
+		Type:      models.CommentTypeCommitRef,
+		CommitSHA: "abcdef4",
+		PosterID:  user.ID,
+		IssueID:   6,
+	}
 
 	issueBean := &models.Issue{RepoID: 3, Index: 1, ID: 6}
 
 	models.AssertNotExistsBean(t, commentBean)
+	models.AssertNotExistsBean(t, commentBean2)
 	models.AssertNotExistsBean(t, issueBean, "is_closed=1")
 	assert.NoError(t, UpdateIssuesCommit(user, repo, pushCommits, repo.DefaultBranch))
 	models.AssertNotExistsBean(t, commentBean)
+	models.AssertNotExistsBean(t, commentBean2)
 	models.AssertNotExistsBean(t, issueBean, "is_closed=1")
 	models.CheckConsistencyFor(t, &models.Action{})
 }