repo.go

// Copyright 2014 The Gogs 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 models

import (
	"errors"
	"fmt"
	"io/ioutil"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"strings"
	"time"
	"unicode/utf8"

	"github.com/Unknwon/cae/zip"
	"github.com/Unknwon/com"

	"github.com/gogits/git"

	"github.com/gogits/gogs/modules/base"
	"github.com/gogits/gogs/modules/log"
)

var (
	ErrRepoAlreadyExist  = errors.New("Repository already exist")
	ErrRepoNotExist      = errors.New("Repository does not exist")
	ErrRepoFileNotExist  = errors.New("Target Repo file does not exist")
	ErrRepoNameIllegal   = errors.New("Repository name contains illegal characters")
	ErrRepoFileNotLoaded = fmt.Errorf("repo file not loaded")
)

var (
	LanguageIgns, Licenses []string
)

func LoadRepoConfig() {
	LanguageIgns = strings.Split(base.Cfg.MustValue("repository", "LANG_IGNS"), "|")
	Licenses = strings.Split(base.Cfg.MustValue("repository", "LICENSES"), "|")
}

func NewRepoContext() {
	zip.Verbose = false

	// Check if server has basic git setting.
	stdout, _, err := com.ExecCmd("git", "config", "--get", "user.name")
	if err != nil {
		fmt.Printf("repo.init(fail to get git user.name): %v", err)
		os.Exit(2)
	} else if len(stdout) == 0 {
		if _, _, err = com.ExecCmd("git", "config", "--global", "user.email", "gogitservice@gmail.com"); err != nil {
			fmt.Printf("repo.init(fail to set git user.email): %v", err)
			os.Exit(2)
		} else if _, _, err = com.ExecCmd("git", "config", "--global", "user.name", "Gogs"); err != nil {
			fmt.Printf("repo.init(fail to set git user.name): %v", err)
			os.Exit(2)
		}
	}
}

// Repository represents a git repository.
type Repository struct {
	Id              int64
	OwnerId         int64 `xorm:"unique(s)"`
	ForkId          int64
	LowerName       string `xorm:"unique(s) index not null"`
	Name            string `xorm:"index not null"`
	Description     string
	Website         string
	NumWatches      int
	NumStars        int
	NumForks        int
	NumIssues       int
	NumClosedIssues int
	NumOpenIssues   int `xorm:"-"`
	IsPrivate       bool
	IsBare          bool
	Created         time.Time `xorm:"created"`
	Updated         time.Time `xorm:"updated"`
}

// IsRepositoryExist returns true if the repository with given name under user has already existed.
func IsRepositoryExist(user *User, repoName string) (bool, error) {
	repo := Repository{OwnerId: user.Id}
	has, err := orm.Where("lower_name = ?", strings.ToLower(repoName)).Get(&repo)
	if err != nil {
		return has, err
	} else if !has {
		return false, nil
	}

	return com.IsDir(RepoPath(user.Name, repoName)), nil
}

var (
	illegalEquals  = []string{"raw", "install", "api", "avatar", "user", "help", "stars", "issues", "pulls", "commits", "repo", "template", "admin"}
	illegalSuffixs = []string{".git"}
)

// IsLegalName returns false if name contains illegal characters.
func IsLegalName(repoName string) bool {
	repoName = strings.ToLower(repoName)
	for _, char := range illegalEquals {
		if repoName == char {
			return false
		}
	}
	for _, char := range illegalSuffixs {
		if strings.HasSuffix(repoName, char) {
			return false
		}
	}
	return true
}

// CreateRepository creates a repository for given user or orgnaziation.
func CreateRepository(user *User, repoName, desc, repoLang, license string, private bool, initReadme bool) (*Repository, error) {
	if !IsLegalName(repoName) {
		return nil, ErrRepoNameIllegal
	}

	isExist, err := IsRepositoryExist(user, repoName)
	if err != nil {
		return nil, err
	} else if isExist {
		return nil, ErrRepoAlreadyExist
	}

	repo := &Repository{
		OwnerId:     user.Id,
		Name:        repoName,
		LowerName:   strings.ToLower(repoName),
		Description: desc,
		IsPrivate:   private,
		IsBare:      repoLang == "" && license == "" && !initReadme,
	}

	repoPath := RepoPath(user.Name, repoName)
	if err = initRepository(repoPath, user, repo, initReadme, repoLang, license); err != nil {
		return nil, err
	}
	session := orm.NewSession()
	defer session.Close()
	session.Begin()

	if _, err = session.Insert(repo); err != nil {
		if err2 := os.RemoveAll(repoPath); err2 != nil {
			log.Error("repo.CreateRepository(repo): %v", err)
			return nil, errors.New(fmt.Sprintf(
				"delete repo directory %s/%s failed(1): %v", user.Name, repoName, err2))
		}
		session.Rollback()
		return nil, err
	}

	access := Access{
		UserName: user.LowerName,
		RepoName: strings.ToLower(path.Join(user.Name, repo.Name)),
		Mode:     AU_WRITABLE,
	}
	if _, err = session.Insert(&access); err != nil {
		session.Rollback()
		if err2 := os.RemoveAll(repoPath); err2 != nil {
			log.Error("repo.CreateRepository(access): %v", err)
			return nil, errors.New(fmt.Sprintf(
				"delete repo directory %s/%s failed(2): %v", user.Name, repoName, err2))
		}
		return nil, err
	}

	rawSql := "UPDATE `user` SET num_repos = num_repos + 1 WHERE id = ?"
	if _, err = session.Exec(rawSql, user.Id); err != nil {
		session.Rollback()
		if err2 := os.RemoveAll(repoPath); err2 != nil {
			log.Error("repo.CreateRepository(repo count): %v", err)
			return nil, errors.New(fmt.Sprintf(
				"delete repo directory %s/%s failed(3): %v", user.Name, repoName, err2))
		}
		return nil, err
	}

	if err = session.Commit(); err != nil {
		session.Rollback()
		if err2 := os.RemoveAll(repoPath); err2 != nil {
			log.Error("repo.CreateRepository(commit): %v", err)
			return nil, errors.New(fmt.Sprintf(
				"delete repo directory %s/%s failed(3): %v", user.Name, repoName, err2))
		}
		return nil, err
	}

	c := exec.Command("git", "update-server-info")
	c.Dir = repoPath
	if err = c.Run(); err != nil {
		log.Error("repo.CreateRepository(exec update-server-info): %v", err)
	}

	if err = NewRepoAction(user, repo); err != nil {
		log.Error("repo.CreateRepository(NewRepoAction): %v", err)
	}

	if err = WatchRepo(user.Id, repo.Id, true); err != nil {
		log.Error("repo.CreateRepository(WatchRepo): %v", err)
	}

	return repo, nil
}

// extractGitBareZip extracts git-bare.zip to repository path.
func extractGitBareZip(repoPath string) error {
	z, err := zip.Open("conf/content/git-bare.zip")
	if err != nil {
		fmt.Println("shi?")
		return err
	}
	defer z.Close()

	return z.ExtractTo(repoPath)
}

// initRepoCommit temporarily changes with work directory.
func initRepoCommit(tmpPath string, sig *git.Signature) (err error) {
	var stderr string
	if _, stderr, err = com.ExecCmdDir(tmpPath, "git", "add", "--all"); err != nil {
		return err
	}
	if len(stderr) > 0 {
		log.Trace("stderr(1): %s", stderr)
	}

	if _, stderr, err = com.ExecCmdDir(tmpPath, "git", "commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email),
		"-m", "Init commit"); err != nil {
		return err
	}
	if len(stderr) > 0 {
		log.Trace("stderr(2): %s", stderr)
	}

	if _, stderr, err = com.ExecCmdDir(tmpPath, "git", "push", "origin", "master"); err != nil {
		return err
	}
	if len(stderr) > 0 {
		log.Trace("stderr(3): %s", stderr)
	}
	return nil
}

func createHookUpdate(hookPath, content string) error {
	pu, err := os.OpenFile(hookPath, os.O_CREATE|os.O_WRONLY, 0777)
	if err != nil {
		return err
	}
	defer pu.Close()

	_, err = pu.WriteString(content)
	return err
}

// InitRepository initializes README and .gitignore if needed.
func initRepository(f string, user *User, repo *Repository, initReadme bool, repoLang, license string) error {
	repoPath := RepoPath(user.Name, repo.Name)

	// Create bare new repository.
	if err := extractGitBareZip(repoPath); err != nil {
		return err
	}

	// hook/post-update
	if err := createHookUpdate(filepath.Join(repoPath, "hooks", "update"),
		fmt.Sprintf("#!/usr/bin/env bash\n%s update $1 $2 $3\n",
			strings.Replace(appPath, "\\", "/", -1))); err != nil {
		return err
	}

	// Initialize repository according to user's choice.
	fileName := map[string]string{}
	if initReadme {
		fileName["readme"] = "README.md"
	}
	if repoLang != "" {
		fileName["gitign"] = ".gitignore"
	}
	if license != "" {
		fileName["license"] = "LICENSE"
	}

	// Clone to temprory path and do the init commit.
	tmpDir := filepath.Join(os.TempDir(), fmt.Sprintf("%d", time.Now().Nanosecond()))
	os.MkdirAll(tmpDir, os.ModePerm)

	if _, _, err := com.ExecCmd("git", "clone", repoPath, tmpDir); err != nil {
		return err
	}

	// README
	if initReadme {
		defaultReadme := repo.Name + "\n" + strings.Repeat("=",
			utf8.RuneCountInString(repo.Name)) + "\n\n" + repo.Description
		if err := ioutil.WriteFile(filepath.Join(tmpDir, fileName["readme"]),
			[]byte(defaultReadme), 0644); err != nil {
			return err
		}
	}

	// .gitignore
	if repoLang != "" {
		filePath := "conf/gitignore/" + repoLang
		if com.IsFile(filePath) {
			if _, err := com.Copy(filePath,
				filepath.Join(tmpDir, fileName["gitign"])); err != nil {
				return err
			}
		}
	}

	// LICENSE
	if license != "" {
		filePath := "conf/license/" + license
		if com.IsFile(filePath) {
			if _, err := com.Copy(filePath,
				filepath.Join(tmpDir, fileName["license"])); err != nil {
				return err
			}
		}
	}

	if len(fileName) == 0 {
		return nil
	}

	// Apply changes and commit.
	return initRepoCommit(tmpDir, user.NewGitSig())
}

// UserRepo reporesents a repository with user name.
type UserRepo struct {
	*Repository
	UserName string
}

// GetRepos returns given number of repository objects with offset.
func GetRepos(num, offset int) ([]UserRepo, error) {
	repos := make([]Repository, 0, num)
	if err := orm.Limit(num, offset).Asc("id").Find(&repos); err != nil {
		return nil, err
	}

	urepos := make([]UserRepo, len(repos))
	for i := range repos {
		urepos[i].Repository = &repos[i]
		u := new(User)
		has, err := orm.Id(urepos[i].Repository.OwnerId).Get(u)
		if err != nil {
			return nil, err
		} else if !has {
			return nil, ErrUserNotExist
		}
		urepos[i].UserName = u.Name
	}

	return urepos, nil
}

func RepoPath(userName, repoName string) string {
	return filepath.Join(UserPath(userName), strings.ToLower(repoName)+".git")
}

func UpdateRepository(repo *Repository) error {
	if len(repo.Description) > 255 {
		repo.Description = repo.Description[:255]
	}
	if len(repo.Website) > 255 {
		repo.Website = repo.Website[:255]
	}

	_, err := orm.Id(repo.Id).AllCols().Update(repo)
	return err
}

// DeleteRepository deletes a repository for a user or orgnaztion.
func DeleteRepository(userId, repoId int64, userName string) (err error) {
	repo := &Repository{Id: repoId, OwnerId: userId}
	has, err := orm.Get(repo)
	if err != nil {
		return err
	} else if !has {
		return ErrRepoNotExist
	}

	session := orm.NewSession()
	if err = session.Begin(); err != nil {
		return err
	}
	if _, err = session.Delete(&Repository{Id: repoId}); err != nil {
		session.Rollback()
		return err
	}
	if _, err := session.Delete(&Access{RepoName: strings.ToLower(path.Join(userName, repo.Name))}); err != nil {
		session.Rollback()
		return err
	}
	rawSql := "UPDATE `user` SET num_repos = num_repos - 1 WHERE id = ?"
	if _, err = session.Exec(rawSql, userId); err != nil {
		session.Rollback()
		return err
	}
	if _, err = session.Delete(&Watch{RepoId: repoId}); err != nil {
		session.Rollback()
		return err
	}
	if err = session.Commit(); err != nil {
		session.Rollback()
		return err
	}
	if err = os.RemoveAll(RepoPath(userName, repo.Name)); err != nil {
		// TODO: log and delete manully
		log.Error("delete repo %s/%s failed: %v", userName, repo.Name, err)
		return err
	}
	return nil
}

// GetRepositoryByName returns the repository by given name under user if exists.
func GetRepositoryByName(userId int64, repoName string) (*Repository, error) {
	repo := &Repository{
		OwnerId:   userId,
		LowerName: strings.ToLower(repoName),
	}
	has, err := orm.Get(repo)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrRepoNotExist
	}
	return repo, err
}

// GetRepositoryById returns the repository by given id if exists.
func GetRepositoryById(id int64) (*Repository, error) {
	repo := &Repository{}
	has, err := orm.Id(id).Get(repo)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrRepoNotExist
	}
	return repo, err
}

// GetRepositories returns the list of repositories of given user.
func GetRepositories(user *User) ([]Repository, error) {
	repos := make([]Repository, 0, 10)
	err := orm.Desc("updated").Find(&repos, &Repository{OwnerId: user.Id})
	return repos, err
}

func GetRepositoryCount(user *User) (int64, error) {
	return orm.Count(&Repository{OwnerId: user.Id})
}

// Watch is connection request for receiving repository notifycation.
type Watch struct {
	Id     int64
	RepoId int64 `xorm:"UNIQUE(watch)"`
	UserId int64 `xorm:"UNIQUE(watch)"`
}

// Watch or unwatch repository.
func WatchRepo(userId, repoId int64, watch bool) (err error) {
	if watch {
		if _, err = orm.Insert(&Watch{RepoId: repoId, UserId: userId}); err != nil {
			return err
		}

		rawSql := "UPDATE `repository` SET num_watches = num_watches + 1 WHERE id = ?"
		_, err = orm.Exec(rawSql, repoId)
	} else {
		if _, err = orm.Delete(&Watch{0, repoId, userId}); err != nil {
			return err
		}
		rawSql := "UPDATE `repository` SET num_watches = num_watches - 1 WHERE id = ?"
		_, err = orm.Exec(rawSql, repoId)
	}
	return err
}

// GetWatches returns all watches of given repository.
func GetWatches(repoId int64) ([]Watch, error) {
	watches := make([]Watch, 0, 10)
	err := orm.Find(&watches, &Watch{RepoId: repoId})
	return watches, err
}

// NotifyWatchers creates batch of actions for every watcher.
func NotifyWatchers(act *Action) error {
	// Add feeds for user self and all watchers.
	watches, err := GetWatches(act.RepoId)
	if err != nil {
		return errors.New("repo.NotifyWatchers(get watches): " + err.Error())
	}

	// Add feed for actioner.
	act.UserId = act.ActUserId
	if _, err = orm.InsertOne(act); err != nil {
		return errors.New("repo.NotifyWatchers(create action): " + err.Error())
	}

	for i := range watches {
		if act.ActUserId == watches[i].UserId {
			continue
		}

		act.UserId = watches[i].UserId
		if _, err = orm.InsertOne(act); err != nil {
			return errors.New("repo.NotifyWatchers(create action): " + err.Error())
		}
	}
	return nil
}

// IsWatching checks if user has watched given repository.
func IsWatching(userId, repoId int64) bool {
	has, _ := orm.Get(&Watch{0, repoId, userId})
	return has
}

func ForkRepository(reposName string, userId int64) {

}