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

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)
+}