Make backend code respond correct JSON when creating PR (#25353)

Fix #25351

routers/web/repo/pull.go

@@ -37,7 +37,6 @@ import (
 	"code.gitea.io/gitea/modules/upload"
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web"
-	"code.gitea.io/gitea/modules/web/middleware"
 	"code.gitea.io/gitea/routers/utils"
 	asymkey_service "code.gitea.io/gitea/services/asymkey"
 	"code.gitea.io/gitea/services/automerge"
@@ -1206,36 +1205,12 @@ func CompareAndPullRequestPost(ctx *context.Context) {
 	}
 
 	if ctx.HasError() {
-		middleware.AssignForm(form, ctx.Data)
-
-		// This stage is already stop creating new pull request, so it does not matter if it has
-		// something to compare or not.
-		PrepareCompareDiff(ctx, ci,
-			gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)))
-		if ctx.Written() {
-			return
-		}
-
-		if len(form.Title) > 255 {
-			var trailer string
-			form.Title, trailer = util.SplitStringAtByteN(form.Title, 255)
-
-			form.Content = trailer + "\n\n" + form.Content
-		}
-		middleware.AssignForm(form, ctx.Data)
-
-		ctx.HTML(http.StatusOK, tplCompareDiff)
+		ctx.JSONError(ctx.GetErrMsg())
 		return
 	}
 
 	if util.IsEmptyString(form.Title) {
-		PrepareCompareDiff(ctx, ci,
-			gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)))
-		if ctx.Written() {
-			return
-		}
-
-		ctx.RenderWithErr(ctx.Tr("repo.issues.new.title_empty"), tplCompareDiff, form)
+		ctx.JSONError(ctx.Tr("repo.issues.new.title_empty"))
 		return
 	}
 
@@ -1278,8 +1253,9 @@ func CompareAndPullRequestPost(ctx *context.Context) {
 			pushrejErr := err.(*git.ErrPushRejected)
 			message := pushrejErr.Message
 			if len(message) == 0 {
-				ctx.Flash.Error(ctx.Tr("repo.pulls.push_rejected_no_message"))
-			} else {
+				ctx.JSONError(ctx.Tr("repo.pulls.push_rejected_no_message"))
+				return
+			}
 			flashError, err := ctx.RenderToString(tplAlertDetails, map[string]interface{}{
 				"Message": ctx.Tr("repo.pulls.push_rejected"),
 				"Summary": ctx.Tr("repo.pulls.push_rejected_summary"),
@@ -1290,8 +1266,7 @@ func CompareAndPullRequestPost(ctx *context.Context) {
 				return
 			}
 			ctx.Flash.Error(flashError)
-			}
-			ctx.Redirect(pullIssue.Link())
+			ctx.JSONRedirect(pullIssue.Link()) // FIXME: it's unfriendly, and will make the content lost
 			return
 		}
 		ctx.ServerError("NewPullRequest", err)
@@ -1299,7 +1274,7 @@ func CompareAndPullRequestPost(ctx *context.Context) {
 	}
 
 	log.Trace("Pull request created: %d/%d", repo.ID, pullIssue.ID)
-	ctx.Redirect(pullIssue.Link())
+	ctx.JSONRedirect(pullIssue.Link())
 }
 
 // CleanUpPullRequest responses for delete merged branch when PR has been merged

tests/integration/pull_create_test.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 	"testing"
 
+	"code.gitea.io/gitea/modules/test"
 	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
@@ -39,8 +40,7 @@ func testPullCreate(t *testing.T, session *TestSession, user, repo, branch, titl
 		"_csrf": htmlDoc.GetCSRF(),
 		"title": title,
 	})
-	resp = session.MakeRequest(t, req, http.StatusSeeOther)
-
+	resp = session.MakeRequest(t, req, http.StatusOK)
 	return resp
 }
 
@@ -52,7 +52,7 @@ func TestPullCreate(t *testing.T) {
 		resp := testPullCreate(t, session, "user1", "repo1", "master", "This is a pull title")
 
 		// check the redirected URL
-		url := resp.Header().Get("Location")
+		url := test.RedirectURL(resp)
 		assert.Regexp(t, "^/user2/repo1/pulls/[0-9]*$", url)
 
 		// check .diff can be accessed and matches performed change
@@ -80,7 +80,7 @@ func TestPullCreate_TitleEscape(t *testing.T) {
 		resp := testPullCreate(t, session, "user1", "repo1", "master", "<i>XSS PR</i>")
 
 		// check the redirected URL
-		url := resp.Header().Get("Location")
+		url := test.RedirectURL(resp)
 		assert.Regexp(t, "^/user2/repo1/pulls/[0-9]*$", url)
 
 		// Edit title
@@ -145,7 +145,7 @@ func TestPullBranchDelete(t *testing.T) {
 		resp := testPullCreate(t, session, "user1", "repo1", "master1", "This is a pull title")
 
 		// check the redirected URL
-		url := resp.Header().Get("Location")
+		url := test.RedirectURL(resp)
 		assert.Regexp(t, "^/user2/repo1/pulls/[0-9]*$", url)
 		req := NewRequest(t, "GET", url)
 		session.MakeRequest(t, req, http.StatusOK)

tests/integration/pull_merge_test.go

@@ -199,7 +199,7 @@ func TestCantMergeWorkInProgress(t *testing.T) {
 
 		resp := testPullCreate(t, session, "user1", "repo1", "master", "[wip] This is a pull title")
 
-		req := NewRequest(t, "GET", resp.Header().Get("Location"))
+		req := NewRequest(t, "GET", test.RedirectURL(resp))
 		resp = session.MakeRequest(t, req, http.StatusOK)
 		htmlDoc := NewHTMLParser(t, resp.Body)
 		text := strings.TrimSpace(htmlDoc.doc.Find(".merge-section > .item").Last().Text())

tests/integration/pull_status_test.go

@@ -30,7 +30,7 @@ func TestPullCreate_CommitStatus(t *testing.T) {
 				"title": "pull request from status1",
 			},
 		)
-		session.MakeRequest(t, req, http.StatusSeeOther)
+		session.MakeRequest(t, req, http.StatusOK)
 
 		req = NewRequest(t, "GET", "/user1/repo1/pulls")
 		resp := session.MakeRequest(t, req, http.StatusOK)
@@ -127,7 +127,7 @@ func TestPullCreate_EmptyChangesWithDifferentCommits(t *testing.T) {
 				"title": "pull request from status1",
 			},
 		)
-		session.MakeRequest(t, req, http.StatusSeeOther)
+		session.MakeRequest(t, req, http.StatusOK)
 
 		req = NewRequest(t, "GET", "/user1/repo1/pulls/1")
 		resp := session.MakeRequest(t, req, http.StatusOK)
@@ -150,7 +150,7 @@ func TestPullCreate_EmptyChangesWithSameCommits(t *testing.T) {
 				"title": "pull request from status1",
 			},
 		)
-		session.MakeRequest(t, req, http.StatusSeeOther)
+		session.MakeRequest(t, req, http.StatusOK)
 		req = NewRequest(t, "GET", "/user1/repo1/pulls/1")
 		resp := session.MakeRequest(t, req, http.StatusOK)
 		doc := NewHTMLParser(t, resp.Body)