3 files changed, 31 insertions, 1 deletions
diff --git a/routers/api/v1/repo/status.go b/routers/api/v1/repo/status.go
index 97ef69a6ea..7bc0edeadc 100644
--- a/routers/api/v1/repo/status.go
+++ b/routers/api/v1/repo/status.go
@@ -184,6 +184,7 @@ func getCommitStatuses(ctx *context.APIContext, sha string) {
 		ctx.Error(http.StatusBadRequest, "ref/sha not given", nil)
 		return
 	}
+	sha = utils.MustConvertToSHA1(ctx.Context, sha)
 	repo := ctx.Repo.Repository
 
 	listOptions := utils.GetListOptions(ctx)
diff --git a/routers/api/v1/utils/git.go b/routers/api/v1/utils/git.go
index 816f8b3595..d05a86c0cd 100644
--- a/routers/api/v1/utils/git.go
+++ b/routers/api/v1/utils/git.go
@@ -34,6 +34,8 @@ func ResolveRefOrSha(ctx *context.APIContext, ref string) string {
 		}
 	}
 
+	sha = MustConvertToSHA1(ctx.Context, sha)
+
 	if ctx.Repo.GitRepo != nil {
 		err := ctx.Repo.GitRepo.AddLastCommitCache(ctx.Repo.Repository.GetCommitsCountCacheKey(ref, ref != sha), ctx.Repo.Repository.FullName(), sha)
 		if err != nil {
@@ -66,3 +68,30 @@ func searchRefCommitByType(ctx *context.APIContext, refType, filter string) (str
 	}
 	return "", "", nil
 }
+
+// ConvertToSHA1 returns a full-length SHA1 from a potential ID string
+func ConvertToSHA1(ctx *context.Context, commitID string) (git.SHA1, error) {
+	if len(commitID) == git.SHAFullLength && git.IsValidSHAPattern(commitID) {
+		sha1, err := git.NewIDFromString(commitID)
+		if err == nil {
+			return sha1, nil
+		}
+	}
+
+	gitRepo, closer, err := git.RepositoryFromContextOrOpen(ctx, ctx.Repo.Repository.RepoPath())
+	if err != nil {
+		return git.SHA1{}, fmt.Errorf("RepositoryFromContextOrOpen: %w", err)
+	}
+	defer closer.Close()
+
+	return gitRepo.ConvertToSHA1(commitID)
+}
+
+// MustConvertToSHA1 returns a full-length SHA1 string from a potential ID string, or returns origin input if it can't convert to SHA1
+func MustConvertToSHA1(ctx *context.Context, commitID string) string {
+	sha, err := ConvertToSHA1(ctx, commitID)
+	if err != nil {
+		return commitID
+	}
+	return sha.String()
+}
diff --git a/routers/web/repo/commit.go b/routers/web/repo/commit.go
index a6553256b0..b56cf928cd 100644
--- a/routers/web/repo/commit.go
+++ b/routers/web/repo/commit.go
@@ -284,7 +284,7 @@ func Diff(ctx *context.Context) {
 		}
 		return
 	}
-	if len(commitID) != 40 {
+	if len(commitID) != git.SHAFullLength {
 		commitID = commit.ID.String()
 	}