Fix issue dependencies (#27736) (#28776)

Backport #27736 by @lng2020

Fix #27722 
Fix #27357
Fix #25837 
Fix #28732 
1. Fix the typo `BlockingByDependenciesNotPermitted`, which causes the
`not permitted message` not to show. The correct one is `Blocking` or
`BlockedBy`
2. Rewrite the perm check. The perm check uses a very tricky way to
avoid duplicate checks for a slice of issues, which is confusing. In
fact, it's also the reason causing the bug. It uses `lastRepoID` and
`lastPerm` to avoid duplicate checks, but forgets to assign the
`lastPerm` at the end of the code block. So I rewrote this to avoid this
trick.
![I U1AT{GNFY3
1HZ`6L{(2L](https://github.com/go-gitea/gitea/assets/70063547/79acd02a-a567-4316-ae0d-11c6461becf1)
3. It also reuses the `blocks` slice, which is even more confusing. So I
rewrote this too.

![UARFPXRGGZQFB7J$2`R}5_R](https://github.com/go-gitea/gitea/assets/70063547/f21cff0f-d9ac-4ce4-ae4d-adffc98ecd99)

Co-authored-by: Nanguan Lin <70063547+lng2020@users.noreply.github.com>

routers/api/v1/repo/issue_dependency.go

@@ -102,23 +102,24 @@ func GetIssueDependencies(ctx *context.APIContext) {
 		return
 	}
 
-	var lastRepoID int64
-	var lastPerm access_model.Permission
+	repoPerms := make(map[int64]access_model.Permission)
+	repoPerms[ctx.Repo.Repository.ID] = ctx.Repo.Permission
 	for _, blocker := range blockersInfo {
 		// Get the permissions for this repository
-		perm := lastPerm
-		if lastRepoID != blocker.Repository.ID {
-			if blocker.Repository.ID == ctx.Repo.Repository.ID {
-				perm = ctx.Repo.Permission
-			} else {
-				var err error
-				perm, err = access_model.GetUserRepoPermission(ctx, &blocker.Repository, ctx.Doer)
-				if err != nil {
-					ctx.ServerError("GetUserRepoPermission", err)
-					return
-				}
+		// If the repo ID exists in the map, return the exist permissions
+		// else get the permission and add it to the map
+		var perm access_model.Permission
+		existPerm, ok := repoPerms[blocker.RepoID]
+		if ok {
+			perm = existPerm
+		} else {
+			var err error
+			perm, err = access_model.GetUserRepoPermission(ctx, &blocker.Repository, ctx.Doer)
+			if err != nil {
+				ctx.ServerError("GetUserRepoPermission", err)
+				return
 			}
-			lastRepoID = blocker.Repository.ID
+			repoPerms[blocker.RepoID] = perm
 		}
 
 		// check permission
@@ -341,29 +342,31 @@ func GetIssueBlocks(ctx *context.APIContext) {
 		return
 	}
 
-	var lastRepoID int64
-	var lastPerm access_model.Permission
-
 	var issues []*issues_model.Issue
+
+	repoPerms := make(map[int64]access_model.Permission)
+	repoPerms[ctx.Repo.Repository.ID] = ctx.Repo.Permission
+
 	for i, depMeta := range deps {
 		if i < skip || i >= max {
 			continue
 		}
 
 		// Get the permissions for this repository
-		perm := lastPerm
-		if lastRepoID != depMeta.Repository.ID {
-			if depMeta.Repository.ID == ctx.Repo.Repository.ID {
-				perm = ctx.Repo.Permission
-			} else {
-				var err error
-				perm, err = access_model.GetUserRepoPermission(ctx, &depMeta.Repository, ctx.Doer)
-				if err != nil {
-					ctx.ServerError("GetUserRepoPermission", err)
-					return
-				}
+		// If the repo ID exists in the map, return the exist permissions
+		// else get the permission and add it to the map
+		var perm access_model.Permission
+		existPerm, ok := repoPerms[depMeta.RepoID]
+		if ok {
+			perm = existPerm
+		} else {
+			var err error
+			perm, err = access_model.GetUserRepoPermission(ctx, &depMeta.Repository, ctx.Doer)
+			if err != nil {
+				ctx.ServerError("GetUserRepoPermission", err)
+				return
 			}
-			lastRepoID = depMeta.Repository.ID
+			repoPerms[depMeta.RepoID] = perm
 		}
 
 		if !perm.CanReadIssuesOrPulls(depMeta.Issue.IsPull) {

routers/web/repo/issue.go

@@ -1948,7 +1948,7 @@ func ViewIssue(ctx *context.Context) {
 		return
 	}
 
-	ctx.Data["BlockingDependencies"], ctx.Data["BlockingByDependenciesNotPermitted"] = checkBlockedByIssues(ctx, blocking)
+	ctx.Data["BlockingDependencies"], ctx.Data["BlockingDependenciesNotPermitted"] = checkBlockedByIssues(ctx, blocking)
 	if ctx.Written() {
 		return
 	}
@@ -2009,38 +2009,34 @@ func ViewIssue(ctx *context.Context) {
 
 // checkBlockedByIssues return canRead and notPermitted
 func checkBlockedByIssues(ctx *context.Context, blockers []*issues_model.DependencyInfo) (canRead, notPermitted []*issues_model.DependencyInfo) {
-	var (
-		lastRepoID int64
-		lastPerm   access_model.Permission
-	)
-	for i, blocker := range blockers {
+	repoPerms := make(map[int64]access_model.Permission)
+	repoPerms[ctx.Repo.Repository.ID] = ctx.Repo.Permission
+	for _, blocker := range blockers {
 		// Get the permissions for this repository
-		perm := lastPerm
-		if lastRepoID != blocker.Repository.ID {
-			if blocker.Repository.ID == ctx.Repo.Repository.ID {
-				perm = ctx.Repo.Permission
-			} else {
-				var err error
-				perm, err = access_model.GetUserRepoPermission(ctx, &blocker.Repository, ctx.Doer)
-				if err != nil {
-					ctx.ServerError("GetUserRepoPermission", err)
-					return nil, nil
-				}
+		// If the repo ID exists in the map, return the exist permissions
+		// else get the permission and add it to the map
+		var perm access_model.Permission
+		existPerm, ok := repoPerms[blocker.RepoID]
+		if ok {
+			perm = existPerm
+		} else {
+			var err error
+			perm, err = access_model.GetUserRepoPermission(ctx, &blocker.Repository, ctx.Doer)
+			if err != nil {
+				ctx.ServerError("GetUserRepoPermission", err)
+				return nil, nil
 			}
-			lastRepoID = blocker.Repository.ID
+			repoPerms[blocker.RepoID] = perm
 		}
-
-		// check permission
-		if !perm.CanReadIssuesOrPulls(blocker.Issue.IsPull) {
-			blockers[len(notPermitted)], blockers[i] = blocker, blockers[len(notPermitted)]
-			notPermitted = blockers[:len(notPermitted)+1]
+		if perm.CanReadIssuesOrPulls(blocker.Issue.IsPull) {
+			canRead = append(canRead, blocker)
+		} else {
+			notPermitted = append(notPermitted, blocker)
 		}
 	}
-	blockers = blockers[len(notPermitted):]
-	sortDependencyInfo(blockers)
+	sortDependencyInfo(canRead)
 	sortDependencyInfo(notPermitted)
-
-	return blockers, notPermitted
+	return canRead, notPermitted
 }
 
 func sortDependencyInfo(blockers []*issues_model.DependencyInfo) {