go-gitea · lunny · Dec 8, 2025 · Dec 8, 2025 · Dec 8, 2025 · Dec 8, 2025
diff --git a/models/user/user.go b/models/user/user.go
@@ -1461,3 +1461,15 @@ func GetUserOrOrgIDByName(ctx context.Context, name string) (int64, error) {
 	}
 	return id, nil
 }
+
+// GetUserOrOrgByName returns the user or org by name
+func GetUserOrOrgByName(ctx context.Context, name string) (*User, error) {
+	var u User
+	has, err := db.GetEngine(ctx).Where("lower_name = ?", strings.ToLower(name)).Get(&u)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrUserNotExist{Name: name}
+	}
+	return &u, nil
+}
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
@@ -1862,6 +1862,7 @@ pulls.desc = Enable pull requests and code reviews.
 pulls.new = New Pull Request
 pulls.new.blocked_user = Cannot create pull request because you are blocked by the repository owner.
 pulls.new.must_collaborator = You must be a collaborator to create pull request.
+pulls.new.already_existed = A pull request between these branches already exists
 pulls.edit.already_changed = Unable to save changes to the pull request. It appears the content has already been changed by another user. Please refresh the page and try editing again to avoid overwriting their changes.
 pulls.view = View Pull Request
 pulls.compare_changes = New Pull Request

diff --git a/routers/api/v1/repo/compare.go b/routers/api/v1/repo/compare.go
@@ -5,7 +5,6 @@ package repo
 
 import (
 	"net/http"
-	"strings"
 
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/gitrepo"
@@ -52,18 +51,7 @@ func CompareDiff(ctx *context.APIContext) {
 		}
 	}
 
-	infoPath := ctx.PathParam("*")
-	infos := []string{ctx.Repo.Repository.DefaultBranch, ctx.Repo.Repository.DefaultBranch}
-	if infoPath != "" {
-		infos = strings.SplitN(infoPath, "...", 2)
-		if len(infos) != 2 {
-			if infos = strings.SplitN(infoPath, "..", 2); len(infos) != 2 {
-				infos = []string{ctx.Repo.Repository.DefaultBranch, infoPath}
-			}
-		}
-	}
-
-	compareResult, closer := parseCompareInfo(ctx, api.CreatePullRequestOption{Base: infos[0], Head: infos[1]})
+	compareResult, closer := parseCompareInfo(ctx, ctx.PathParam("*"))
 	if ctx.Written() {
 		return
 	}

diff --git a/routers/api/v1/repo/pull.go b/routers/api/v1/repo/pull.go
@@ -28,8 +28,10 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers/api/v1/utils"
+	"code.gitea.io/gitea/routers/common"
 	asymkey_service "code.gitea.io/gitea/services/asymkey"
 	"code.gitea.io/gitea/services/automerge"
 	"code.gitea.io/gitea/services/context"
@@ -413,7 +415,7 @@ func CreatePullRequest(ctx *context.APIContext) {
 	)
 
 	// Get repo/branch information
-	compareResult, closer := parseCompareInfo(ctx, form)
+	compareResult, closer := parseCompareInfo(ctx, form.Base+".."+form.Head)
 	if ctx.Written() {
 		return
 	}
@@ -1065,61 +1067,37 @@ type parseCompareInfoResult struct {
 }
 
 // parseCompareInfo returns non-nil if it succeeds, it always writes to the context and returns nil if it fails
-func parseCompareInfo(ctx *context.APIContext, form api.CreatePullRequestOption) (result *parseCompareInfoResult, closer func()) {
-	var err error
-	// Get compared branches information
-	// format: <base branch>...[<head repo>:]<head branch>
-	// base<-head: master...head:feature
-	// same repo: master...feature
+func parseCompareInfo(ctx *context.APIContext, compareParam string) (result *parseCompareInfoResult, closer func()) {
 	baseRepo := ctx.Repo.Repository
-	baseRefToGuess := form.Base
-
-	headUser := ctx.Repo.Owner
-	headRefToGuess := form.Head
-	if headInfos := strings.Split(form.Head, ":"); len(headInfos) == 1 {
-		// If there is no head repository, it means pull request between same repository.
-		// Do nothing here because the head variables have been assigned above.
-	} else if len(headInfos) == 2 {
-		// There is a head repository (the head repository could also be the same base repo)
-		headRefToGuess = headInfos[1]
-		headUser, err = user_model.GetUserByName(ctx, headInfos[0])
-		if err != nil {
-			if user_model.IsErrUserNotExist(err) {
-				ctx.APIErrorNotFound("GetUserByName")
-			} else {
-				ctx.APIErrorInternal(err)
-			}
-			return nil, nil
-		}
-	} else {
+	compareReq, err := common.ParseCompareRouterParam(compareParam)
+	if err != nil {
 		ctx.APIErrorNotFound()
 		return nil, nil
 	}
 
-	isSameRepo := ctx.Repo.Owner.ID == headUser.ID
-
-	// Check if current user has fork of repository or in the same repository.
-	headRepo := repo_model.GetForkedRepo(ctx, headUser.ID, baseRepo.ID)
-	if headRepo == nil && !isSameRepo {
-		err = baseRepo.GetBaseRepo(ctx)
-		if err != nil {
-			ctx.APIErrorInternal(err)
-			return nil, nil
-		}
+	// remove the check when we support compare with carets
+	if compareReq.CaretTimes > 0 {
+		ctx.APIErrorNotFound("Unsupported compare syntax with carets")
+		return nil, nil
+	}
 
-		// Check if baseRepo's base repository is the same as headUser's repository.
-		if baseRepo.BaseRepo == nil || baseRepo.BaseRepo.OwnerID != headUser.ID {
-			log.Trace("parseCompareInfo[%d]: does not have fork or in same repository", baseRepo.ID)
-			ctx.APIErrorNotFound("GetBaseRepo")
-			return nil, nil
-		}
-		// Assign headRepo so it can be used below.
-		headRepo = baseRepo.BaseRepo
+	_, headRepo, err := common.GetHeadOwnerAndRepo(ctx, baseRepo, compareReq)
+	switch {
+	case errors.Is(err, util.ErrInvalidArgument):
+		ctx.APIError(http.StatusBadRequest, err.Error())
+		return nil, nil
+	case errors.Is(err, util.ErrNotExist):
+		ctx.APIErrorNotFound()
+		return nil, nil
+	case err != nil:
+		ctx.APIErrorInternal(err)
+		return nil, nil
 	}
 
+	isSameRepo := baseRepo.ID == headRepo.ID
+
 	var headGitRepo *git.Repository
 	if isSameRepo {
-		headRepo = ctx.Repo.Repository
 		headGitRepo = ctx.Repo.GitRepo
 		closer = func() {} // no need to close the head repo because it shares the base repo
 	} else {
@@ -1143,9 +1121,9 @@ func parseCompareInfo(ctx *context.APIContext, form api.CreatePullRequestOption)
 		return nil, nil
 	}
 
-	if !permBase.CanReadIssuesOrPulls(true) || !permBase.CanRead(unit.TypeCode) {
-		log.Trace("Permission Denied: User %-v cannot create/read pull requests or cannot read code in Repo %-v\nUser in baseRepo has Permissions: %-+v", ctx.Doer, baseRepo, permBase)
-		ctx.APIErrorNotFound("Can't read pulls or can't read UnitTypeCode")
+	if !permBase.CanRead(unit.TypeCode) {
+		log.Trace("Permission Denied: User %-v cannot read code in Repo %-v\nUser in baseRepo has Permissions: %-+v", ctx.Doer, baseRepo, permBase)
+		ctx.APIErrorNotFound("can't read baseRepo UnitTypeCode")
 		return nil, nil
 	}
 
@@ -1162,10 +1140,10 @@ func parseCompareInfo(ctx *context.APIContext, form api.CreatePullRequestOption)
 		return nil, nil
 	}
 
-	baseRef := ctx.Repo.GitRepo.UnstableGuessRefByShortName(baseRefToGuess)
-	headRef := headGitRepo.UnstableGuessRefByShortName(headRefToGuess)
+	baseRef := ctx.Repo.GitRepo.UnstableGuessRefByShortName(util.Iif(compareReq.BaseOriRef == "", baseRepo.DefaultBranch, compareReq.BaseOriRef))
+	headRef := headGitRepo.UnstableGuessRefByShortName(util.Iif(compareReq.HeadOriRef == "", headRepo.DefaultBranch, compareReq.HeadOriRef))
 
-	log.Trace("Repo path: %q, base ref: %q->%q, head ref: %q->%q", ctx.Repo.Repository.RelativePath(), baseRefToGuess, baseRef, headRefToGuess, headRef)
+	log.Trace("Repo path: %q, base ref: %q->%q, head ref: %q->%q", ctx.Repo.Repository.RelativePath(), compareReq.BaseOriRef, baseRef, compareReq.HeadOriRef, headRef)
 
 	baseRefValid := baseRef.IsBranch() || baseRef.IsTag() || git.IsStringLikelyCommitID(git.ObjectFormatFromName(ctx.Repo.Repository.ObjectFormatName), baseRef.ShortName())
 	headRefValid := headRef.IsBranch() || headRef.IsTag() || git.IsStringLikelyCommitID(git.ObjectFormatFromName(headRepo.ObjectFormatName), headRef.ShortName())
@@ -1175,7 +1153,7 @@ func parseCompareInfo(ctx *context.APIContext, form api.CreatePullRequestOption)
 		return nil, nil
 	}
 
-	compareInfo, err := pull_service.GetCompareInfo(ctx, baseRepo, headRepo, headGitRepo, baseRef.ShortName(), headRef.ShortName(), false, false)
+	compareInfo, err := pull_service.GetCompareInfo(ctx, baseRepo, headRepo, headGitRepo, baseRef.ShortName(), headRef.ShortName(), compareReq.DirectComparison(), false)
 	if err != nil {
 		ctx.APIErrorInternal(err)
 		return nil, nil