// Copyright 2021 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package utils import (	gocontext "context"	"fmt"	"net/http" 	"forgejo.org/modules/git"	"forgejo.org/modules/gitrepo"	"forgejo.org/modules/log"	"forgejo.org/services/context") // ResolveRefOrSha resolve ref to sha if existfunc ResolveRefOrSha(ctx *context.APIContext, ref string) string {	if len(ref) == 0 {		ctx.Error(http.StatusBadRequest, "ref not given", nil)		return ""	} 	sha := ref	// Search branches and tags	for _, refType := range []string{"heads", "tags"} {		refSHA, lastMethodName, err := searchRefCommitByType(ctx, refType, ref)		if err != nil {			ctx.Error(http.StatusInternalServerError, lastMethodName, err)			return ""		}		if refSHA != "" {			sha = refSHA			break		}	} 	sha = MustConvertToSHA1(ctx, ctx.Repo, 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 {			log.Error("Unable to get commits count for %s in %s. Error: %v", sha, ctx.Repo.Repository.FullName(), err)		}	} 	return sha} // GetGitRefs return git references based on filterfunc GetGitRefs(ctx *context.APIContext, filter string) ([]*git.Reference, string, error) {	if ctx.Repo.GitRepo == nil {		return nil, "", fmt.Errorf("no open git repo found in context")	}	if len(filter) > 0 {		filter = "refs/" + filter	}	refs, err := ctx.Repo.GitRepo.GetRefsFiltered(filter)	return refs, "GetRefsFiltered", err} func searchRefCommitByType(ctx *context.APIContext, refType, filter string) (string, string, error) {	refs, lastMethodName, err := GetGitRefs(ctx, refType+"/"+filter) // Search by type	if err != nil {		return "", lastMethodName, err	}	if len(refs) > 0 {		return refs[0].Object.String(), "", nil // Return found SHA	}	return "", "", nil} // ConvertToObjectID returns a full-length SHA1 from a potential ID stringfunc ConvertToObjectID(ctx gocontext.Context, repo *context.Repository, commitID string) (git.ObjectID, error) {	objectFormat := repo.GetObjectFormat()	if len(commitID) == objectFormat.FullLength() && objectFormat.IsValid(commitID) {		sha, err := git.NewIDFromString(commitID)		if err == nil {			return sha, nil		}	} 	gitRepo, closer, err := gitrepo.RepositoryFromContextOrOpen(ctx, repo.Repository)	if err != nil {		return objectFormat.EmptyObjectID(), fmt.Errorf("RepositoryFromContextOrOpen: %w", err)	}	defer closer.Close() 	return gitRepo.ConvertToGitID(commitID)} // MustConvertToSHA1 returns a full-length SHA1 string from a potential ID string, or returns origin input if it can't convert to SHA1func MustConvertToSHA1(ctx gocontext.Context, repo *context.Repository, commitID string) string {	sha, err := ConvertToObjectID(ctx, repo, commitID)	if err != nil {		return commitID	}	return sha.String()}