Only view milestones from current repo (#18414) (#18417)

Backport #18414

The endpoint /{username}/{reponame}/milestone/{id} is not currently restricted to
the repo. This PR restricts the milestones to those within the repo.

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

models/issue_milestone.go

@@ -134,22 +134,6 @@ func GetMilestoneByRepoIDANDName(repoID int64, name string) (*Milestone, error)
 	return &mile, nil
 }
 
-// GetMilestoneByID returns the milestone via id .
-func GetMilestoneByID(id int64) (*Milestone, error) {
-	return getMilestoneByID(db.GetEngine(db.DefaultContext), id)
-}
-
-func getMilestoneByID(e db.Engine, id int64) (*Milestone, error) {
-	var m Milestone
-	has, err := e.ID(id).Get(&m)
-	if err != nil {
-		return nil, err
-	} else if !has {
-		return nil, ErrMilestoneNotExist{ID: id, RepoID: 0}
-	}
-	return &m, nil
-}
-
 // UpdateMilestone updates information of given milestone.
 func UpdateMilestone(m *Milestone, oldIsClosed bool) error {
 	ctx, committer, err := db.TxContext()

routers/web/repo/issue.go

@@ -802,7 +802,7 @@ func NewIssue(ctx *context.Context) {
 
 	milestoneID := ctx.FormInt64("milestone")
 	if milestoneID > 0 {
-		milestone, err := models.GetMilestoneByID(milestoneID)
+		milestone, err := models.GetMilestoneByRepoID(ctx.Repo.Repository.ID, milestoneID)
 		if err != nil {
 			log.Error("GetMilestoneByID: %d: %v", milestoneID, err)
 		} else {
@@ -889,7 +889,7 @@ func ValidateRepoMetas(ctx *context.Context, form forms.CreateIssueForm, isPull
 	// Check milestone.
 	milestoneID := form.MilestoneID
 	if milestoneID > 0 {
-		milestone, err := models.GetMilestoneByID(milestoneID)
+		milestone, err := models.GetMilestoneByRepoID(ctx.Repo.Repository.ID, milestoneID)
 		if err != nil {
 			ctx.ServerError("GetMilestoneByID", err)
 			return nil, nil, 0, 0

routers/web/repo/milestone.go

@@ -264,7 +264,7 @@ func DeleteMilestone(ctx *context.Context) {
 // MilestoneIssuesAndPulls lists all the issues and pull requests of the milestone
 func MilestoneIssuesAndPulls(ctx *context.Context) {
 	milestoneID := ctx.ParamsInt64(":id")
-	milestone, err := models.GetMilestoneByID(milestoneID)
+	milestone, err := models.GetMilestoneByRepoID(ctx.Repo.Repository.ID, milestoneID)
 	if err != nil {
 		if models.IsErrMilestoneNotExist(err) {
 			ctx.NotFound("GetMilestoneByID", err)