WIP: Feature #11835 - Adds Git Refs API

models/git/refs.go

@@ -0,0 +1,72 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package git
+
+import (
+	"strings"
+
+	"code.gitea.io/gitea/modules/git"
+)
+
+// CheckReferenceEditability checks if the reference can be modified by the user or any user
+func CheckReferenceEditability(refName, commitID string, repoID, userID int64) error {
+	refParts := strings.Split(refName, "/")
+
+	// Must have at least 3 parts, e.g. refs/heads/new-branch
+	if len(refParts) <= 2 {
+		return git.ErrInvalidRefName{
+			RefName: refName,
+			Reason:  "reference name must contain at least three slash-separted components",
+		}
+	}
+
+	// Must start with 'refs/'
+	if refParts[0] != "refs/" {
+		return git.ErrInvalidRefName{
+			RefName: refName,
+			Reason:  "reference must start with 'refs/'",
+		}
+	}
+
+	// 'refs/pull/*' is not allowed
+	if refParts[1] == "pull" {
+		return git.ErrInvalidRefName{
+			RefName: refName,
+			Reason:  "refs/pull/* is read-only",
+		}
+	}
+
+	if refParts[1] == "tags" {
+		// If the 2nd part is "tags" then we need ot make sure the user is allowed to
+		//   modify this tag (not protected or is admin)
+		if protectedTags, err := GetProtectedTags(repoID); err == nil {
+			isAllowed, err := IsUserAllowedToControlTag(protectedTags, refName, userID)
+			if err != nil {
+				return err
+			}
+			if !isAllowed {
+				return git.ErrProtectedRefName{
+					RefName: refName,
+					Message: "you're not authorized to change a protected tag",
+				}
+			}
+		}
+	} else if refParts[1] == "heads" {
+		// If the 2nd part is "heas" then we need to make sure the user is allowed to
+		//   modify this branch (not protected or is admin)
+		isProtected, err := IsProtectedBranch(repoID, refName)
+		if err != nil {
+			return err
+		}
+		if !isProtected {
+			return git.ErrProtectedRefName{
+				RefName: refName,
+				Message: "changes must be made through a pull request",
+			}
+		}
+	}
+
+	return nil
+}

modules/convert/git_ref.go

@@ -0,0 +1,27 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package convert
+
+import (
+	"net/url"
+
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/modules/git"
+	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
+)
+
+// ToGitRef converts a git.Reference to a api.Reference
+func ToGitRef(repo *repo_model.Repository, ref *git.Reference) *api.Reference {
+	return &api.Reference{
+		Ref: ref.Name,
+		URL: repo.APIURL() + "/git/" + util.PathEscapeSegments(ref.Name),
+		Object: &api.GitObject{
+			SHA:  ref.Object.String(),
+			Type: ref.Type,
+			URL:  repo.APIURL() + "/git/" + url.PathEscape(ref.Type) + "s/" + url.PathEscape(ref.Object.String()),
+		},
+	}
+}

modules/git/error.go

@@ -186,3 +186,69 @@ func IsErrMoreThanOne(err error) bool {
 func (err *ErrMoreThanOne) Error() string {
 	return fmt.Sprintf("ErrMoreThanOne Error: %v: %s\n%s", err.Err, err.StdErr, err.StdOut)
 }
+
+// ErrRefNotFound represents a "RefDoesMotExist" kind of error.
+type ErrRefNotFound struct {
+	RefName string
+}
+
+// IsErrRefNotFound checks if an error is a ErrRefNotFound.
+func IsErrRefNotFound(err error) bool {
+	_, ok := err.(ErrRefNotFound)
+	return ok
+}
+
+func (err ErrRefNotFound) Error() string {
+	return fmt.Sprintf("ref does not exist [ref_name: %s]", err.RefName)
+}
+
+// ErrInvalidRefName represents a "InvalidRefName" kind of error.
+type ErrInvalidRefName struct {
+	RefName string
+	Reason  string
+}
+
+// IsErrInvalidRefName checks if an error is a ErrInvalidRefName.
+func IsErrInvalidRefName(err error) bool {
+	_, ok := err.(ErrInvalidRefName)
+	return ok
+}
+
+func (err ErrInvalidRefName) Error() string {
+	return fmt.Sprintf("ref name is not valid: %s [ref_name: %s]", err.Reason, err.RefName)
+}
+
+// ErrProtectedRefName represents a "ProtectedRefName" kind of error.
+type ErrProtectedRefName struct {
+	RefName string
+	Message string
+}
+
+// IsErrProtectedRefName checks if an error is a ErrProtectedRefName.
+func IsErrProtectedRefName(err error) bool {
+	_, ok := err.(ErrProtectedRefName)
+	return ok
+}
+
+func (err ErrProtectedRefName) Error() string {
+	str := fmt.Sprintf("ref name is protected [ref_name: %s]", err.RefName)
+	if err.Message != "" {
+		str = fmt.Sprintf("%s: %s", str, err.Message)
+	}
+	return str
+}
+
+// ErrRefAlreadyExists represents an error that ref with such name already exists.
+type ErrRefAlreadyExists struct {
+	RefName string
+}
+
+// IsErrRefAlreadyExists checks if an error is an ErrRefAlreadyExists.
+func IsErrRefAlreadyExists(err error) bool {
+	_, ok := err.(ErrRefAlreadyExists)
+	return ok
+}
+
+func (err ErrRefAlreadyExists) Error() string {
+	return fmt.Sprintf("ref already exists [name: %s]", err.RefName)
+}

modules/git/repo_ref.go

@@ -8,3 +8,18 @@ package git
 func (repo *Repository) GetRefs() ([]*Reference, error) {
 	return repo.GetRefsFiltered("")
 }
+
+// GetReference gets the Reference object that a refName refers to
+func (repo *Repository) GetReference(refName string) (*Reference, error) {
+	refs, err := repo.GetRefsFiltered(refName)
+	if err != nil {
+		return nil, err
+	}
+	var ref *Reference
+	for _, ref = range refs {
+		if ref.Name == refName {
+			return ref, nil
+		}
+	}
+	return nil, ErrRefNotFound{RefName: refName}
+}

modules/structs/repo.go

@@ -242,6 +242,29 @@ type CreateBranchRepoOption struct {
 	OldBranchName string `json:"old_branch_name" binding:"GitRefName;MaxSize(100)"`
 }
 
+// CreateGitRefOption options when creating a git ref in a repository
+// swagger:model
+type CreateGitRefOption struct {
+	// The name of the reference.
+	//
+	// required: true
+	RefName string `json:"ref" binding:"Required;GitRefName;MaxSize(100)"`
+
+	// The target commitish for this reference.
+	//
+	// required: true
+	Target string `json:"target" binding:"Required"`
+}
+
+// UpdateGitRefOption options when updating a git ref in a repository
+// swagger:model
+type UpdateGitRefOption struct {
+	// The target commitish for the reference to be updated to.
+	//
+	// required: true
+	Target string `json:"target" binding:"Required"`
+}
+
 // TransferRepoOption options when transfer a repository's ownership
 // swagger:model
 type TransferRepoOption struct {

routers/api/v1/api.go

@@ -1042,8 +1042,15 @@ func Routes(ctx gocontext.Context) *web.Route {
 						m.Get("/{sha}", repo.GetSingleCommit)
 						m.Get("/{sha}.{diffType:diff|patch}", repo.DownloadCommitDiffOrPatch)
 					})
-					m.Get("/refs", repo.GetGitAllRefs)
-					m.Get("/refs/*", repo.GetGitRefs)
+					m.Group("/refs", func() {
+						m.Get("", repo.GetGitAllRefs)
+						m.Post("", reqToken(), reqRepoWriter(unit.TypeCode), bind(api.CreateGitRefOption{}), repo.CreateGitRef)
+						m.Get("/*", repo.GetGitRefs)
+						m.Group("/*", func() {
+							m.Patch("", bind(api.UpdateGitRefOption{}), repo.UpdateGitRef)
+							m.Delete("", repo.DeleteGitRef)
+						}, reqToken(), reqRepoWriter(unit.TypeCode))
+					})
 					m.Get("/trees/{sha}", repo.GetTree)
 					m.Get("/blobs/{sha}", repo.GetBlob)
 					m.Get("/tags/{sha}", repo.GetAnnotatedTag)