Repository avatars (#6986)

* Repository avatars

- first variant of code from old work for gogs
- add migration 87
- add new option in app.ini
- add en-US locale string
- add new class in repository.less

* Add changed index.css, remove unused template name

* Update en-us doc about configuration options

* Add comments to new functions, add new option to docker app.ini

* Add comment for lint

* Remove variable, not needed

* Fix formatting

* Update swagger api template

* Check if avatar exists

* Fix avatar link/path checks

* Typo

* TEXT column can't have a default value

* Fixes:

- remove old avatar file on upload
- use ID in name of avatar file - users may upload same files
- add simple tests

* Fix fmt check

* Generate PNG instead of "static" GIF

* More informative comment

* Fix error message

* Update avatar upload checks:

- add file size check
- add new option
- update config docs
- add new string to en-us locale

* Fixes:

- use FileHEader field for check file size
- add new test - upload big image

* Fix formatting

* Update comments

* Update log message

* Removed wrong style - not needed

* Use Sync2 to migrate

* Update repos list view

- bigger avatar
- fix html blocks alignment

* A little adjust avatar size

* Use small icons for explore/repo list

* Use new cool avatar preparation func by @lafriks

* Missing changes for new function

* Remove unused import, move imports

* Missed new option definition in app.ini

Add file size check in user/profile avatar upload

* Use smaller field length for Avatar

* Use session to update repo DB data, update DeleteAvatar - use session too

* Fix err variable definition

* As suggested @lafriks - return as soon as possible, code readability

4 files changed, 207 insertions, 0 deletions

diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go
index f3a090e41c..b95a74c362 100644
--- a/models/migrations/migrations.go
+++ b/models/migrations/migrations.go
@@ -227,6 +227,8 @@ var migrations = []Migration{
 	NewMigration("hash application token", hashAppToken),
 	// v86 -> v87
 	NewMigration("add http method to webhook", addHTTPMethodToWebhook),
+	// v87 -> v88
+	NewMigration("add avatar field to repository", addAvatarFieldToRepository),
 }
 
 // Migrate database to current version
diff --git a/models/migrations/v87.go b/models/migrations/v87.go
new file mode 100644
index 0000000000..94711ac669
--- /dev/null
+++ b/models/migrations/v87.go
@@ -0,0 +1,18 @@
+// Copyright 2019 Gitea. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"github.com/go-xorm/xorm"
+)
+
+func addAvatarFieldToRepository(x *xorm.Engine) error {
+	type Repository struct {
+		// ID(10-20)-md5(32) - must fit into 64 symbols
+		Avatar string `xorm:"VARCHAR(64)"`
+	}
+
+	return x.Sync2(new(Repository))
+}
diff --git a/models/repo.go b/models/repo.go
index 3283223d5b..b8a3714abf 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -7,9 +7,14 @@ package models
 
 import (
 	"bytes"
+	"crypto/md5"
 	"errors"
 	"fmt"
 	"html/template"
+
+	// Needed for jpeg support
+	_ "image/jpeg"
+	"image/png"
 	"io/ioutil"
 	"net/url"
 	"os"
@@ -21,6 +26,7 @@ import (
 	"strings"
 	"time"
 
+	"code.gitea.io/gitea/modules/avatar"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup"
@@ -166,6 +172,9 @@ type Repository struct {
 	CloseIssuesViaCommitInAnyBranch bool               `xorm:"NOT NULL DEFAULT false"`
 	Topics                          []string           `xorm:"TEXT JSON"`
 
+	// Avatar: ID(10-20)-md5(32) - must fit into 64 symbols
+	Avatar string `xorm:"VARCHAR(64)"`
+
 	CreatedUnix util.TimeStamp `xorm:"INDEX created"`
 	UpdatedUnix util.TimeStamp `xorm:"INDEX updated"`
 }
@@ -290,6 +299,7 @@ func (repo *Repository) innerAPIFormat(e Engine, mode AccessMode, isParent bool)
 		Created:       repo.CreatedUnix.AsTime(),
 		Updated:       repo.UpdatedUnix.AsTime(),
 		Permissions:   permission,
+		AvatarURL:     repo.AvatarLink(),
 	}
 }
 
@@ -1869,6 +1879,15 @@ func DeleteRepository(doer *User, uid, repoID int64) error {
 		go HookQueue.Add(repo.ID)
 	}
 
+	if len(repo.Avatar) > 0 {
+		avatarPath := repo.CustomAvatarPath()
+		if com.IsExist(avatarPath) {
+			if err := os.Remove(avatarPath); err != nil {
+				return fmt.Errorf("Failed to remove %s: %v", avatarPath, err)
+			}
+		}
+	}
+
 	DeleteRepoFromIndexer(repo)
 	return nil
 }
@@ -2452,3 +2471,118 @@ func (repo *Repository) GetUserFork(userID int64) (*Repository, error) {
 	}
 	return &forkedRepo, nil
 }
+
+// CustomAvatarPath returns repository custom avatar file path.
+func (repo *Repository) CustomAvatarPath() string {
+	// Avatar empty by default
+	if len(repo.Avatar) <= 0 {
+		return ""
+	}
+	return filepath.Join(setting.RepositoryAvatarUploadPath, repo.Avatar)
+}
+
+// RelAvatarLink returns a relative link to the user's avatar.
+// The link a sub-URL to this site
+// Since Gravatar support not needed here - just check for image path.
+func (repo *Repository) RelAvatarLink() string {
+	// If no avatar - path is empty
+	avatarPath := repo.CustomAvatarPath()
+	if len(avatarPath) <= 0 {
+		return ""
+	}
+	if !com.IsFile(avatarPath) {
+		return ""
+	}
+	return setting.AppSubURL + "/repo-avatars/" + repo.Avatar
+}
+
+// AvatarLink returns user avatar absolute link.
+func (repo *Repository) AvatarLink() string {
+	link := repo.RelAvatarLink()
+	// link may be empty!
+	if len(link) > 0 {
+		if link[0] == '/' && link[1] != '/' {
+			return setting.AppURL + strings.TrimPrefix(link, setting.AppSubURL)[1:]
+		}
+	}
+	return link
+}
+
+// UploadAvatar saves custom avatar for repository.
+// FIXME: split uploads to different subdirs in case we have massive number of repos.
+func (repo *Repository) UploadAvatar(data []byte) error {
+	m, err := avatar.Prepare(data)
+	if err != nil {
+		return err
+	}
+
+	sess := x.NewSession()
+	defer sess.Close()
+	if err = sess.Begin(); err != nil {
+		return err
+	}
+
+	oldAvatarPath := repo.CustomAvatarPath()
+
+	// Users can upload the same image to other repo - prefix it with ID
+	// Then repo will be removed - only it avatar file will be removed
+	repo.Avatar = fmt.Sprintf("%d-%x", repo.ID, md5.Sum(data))
+	if _, err := sess.ID(repo.ID).Cols("avatar").Update(repo); err != nil {
+		return fmt.Errorf("UploadAvatar: Update repository avatar: %v", err)
+	}
+
+	if err := os.MkdirAll(setting.RepositoryAvatarUploadPath, os.ModePerm); err != nil {
+		return fmt.Errorf("UploadAvatar: Failed to create dir %s: %v", setting.RepositoryAvatarUploadPath, err)
+	}
+
+	fw, err := os.Create(repo.CustomAvatarPath())
+	if err != nil {
+		return fmt.Errorf("UploadAvatar: Create file: %v", err)
+	}
+	defer fw.Close()
+
+	if err = png.Encode(fw, *m); err != nil {
+		return fmt.Errorf("UploadAvatar: Encode png: %v", err)
+	}
+
+	if len(oldAvatarPath) > 0 && oldAvatarPath != repo.CustomAvatarPath() {
+		if err := os.Remove(oldAvatarPath); err != nil {
+			return fmt.Errorf("UploadAvatar: Failed to remove old repo avatar %s: %v", oldAvatarPath, err)
+		}
+	}
+
+	return sess.Commit()
+}
+
+// DeleteAvatar deletes the repos's custom avatar.
+func (repo *Repository) DeleteAvatar() error {
+
+	// Avatar not exists
+	if len(repo.Avatar) == 0 {
+		return nil
+	}
+
+	avatarPath := repo.CustomAvatarPath()
+	log.Trace("DeleteAvatar[%d]: %s", repo.ID, avatarPath)
+
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	repo.Avatar = ""
+	if _, err := sess.ID(repo.ID).Cols("avatar").Update(repo); err != nil {
+		return fmt.Errorf("DeleteAvatar: Update repository avatar: %v", err)
+	}
+
+	if _, err := os.Stat(avatarPath); err == nil {
+		if err := os.Remove(avatarPath); err != nil {
+			return fmt.Errorf("DeleteAvatar: Failed to remove %s: %v", avatarPath, err)
+		}
+	} else {
+		// // Schrodinger: file may or may not exist. See err for details.
+		log.Trace("DeleteAvatar[%d]: %v", err)
+	}
+	return sess.Commit()
+}
diff --git a/models/repo_test.go b/models/repo_test.go
index eee3997868..8411536d70 100644
--- a/models/repo_test.go
+++ b/models/repo_test.go
@@ -5,6 +5,11 @@
 package models
 
 import (
+	"bytes"
+	"crypto/md5"
+	"fmt"
+	"image"
+	"image/png"
 	"testing"
 
 	"code.gitea.io/gitea/modules/markup"
@@ -158,3 +163,51 @@ func TestTransferOwnership(t *testing.T) {
 
 	CheckConsistencyFor(t, &Repository{}, &User{}, &Team{})
 }
+
+func TestUploadAvatar(t *testing.T) {
+
+	// Generate image
+	myImage := image.NewRGBA(image.Rect(0, 0, 1, 1))
+	var buff bytes.Buffer
+	png.Encode(&buff, myImage)
+
+	assert.NoError(t, PrepareTestDatabase())
+	repo := AssertExistsAndLoadBean(t, &Repository{ID: 10}).(*Repository)
+
+	err := repo.UploadAvatar(buff.Bytes())
+	assert.NoError(t, err)
+	assert.Equal(t, fmt.Sprintf("%d-%x", 10, md5.Sum(buff.Bytes())), repo.Avatar)
+}
+
+func TestUploadBigAvatar(t *testing.T) {
+
+	// Generate BIG image
+	myImage := image.NewRGBA(image.Rect(0, 0, 5000, 1))
+	var buff bytes.Buffer
+	png.Encode(&buff, myImage)
+
+	assert.NoError(t, PrepareTestDatabase())
+	repo := AssertExistsAndLoadBean(t, &Repository{ID: 10}).(*Repository)
+
+	err := repo.UploadAvatar(buff.Bytes())
+	assert.Error(t, err)
+}
+
+func TestDeleteAvatar(t *testing.T) {
+
+	// Generate image
+	myImage := image.NewRGBA(image.Rect(0, 0, 1, 1))
+	var buff bytes.Buffer
+	png.Encode(&buff, myImage)
+
+	assert.NoError(t, PrepareTestDatabase())
+	repo := AssertExistsAndLoadBean(t, &Repository{ID: 10}).(*Repository)
+
+	err := repo.UploadAvatar(buff.Bytes())
+	assert.NoError(t, err)
+
+	err = repo.DeleteAvatar()
+	assert.NoError(t, err)
+
+	assert.Equal(t, "", repo.Avatar)
+}