[Enhancement] Allow admin to merge pr with protected file changes (#12078)

* [Enhancement] Allow admin to merge pr with protected file changes

As tilte, show protected message in diff page and merge box.

Signed-off-by: a1012112796 <1012112796@qq.com>

* remove unused ver

* Update options/locale/locale_en-US.ini

Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>

* Add TrN

* Apply suggestions from code review

* fix lint

* Update options/locale/locale_en-US.ini

Co-authored-by: zeripath <art27@cantab.net>

* Apply suggestions from code review

* move pr proteced files check to TestPatch
* Call TestPatch when protected branches settings changed

* Apply review suggestion @CirnoT

* move to service @lunny

* slightly restructure routers/private/hook.go

Adds a lot of comments and simplifies the logic

Signed-off-by: Andrew Thornton <art27@cantab.net>

* placate lint

Signed-off-by: Andrew Thornton <art27@cantab.net>

* skip duplicate protected files check

* fix check logic

* slight refactor of TestPatch

Signed-off-by: Andrew Thornton <art27@cantab.net>

* When checking for protected files changes in TestPatch use the temporary repository

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix introduced issue with hook

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove the check on PR index being greater than 0 as it unnecessary

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <matti@mdranta.net>
Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

4 files changed, 58 insertions, 0 deletions

diff --git a/models/branches.go b/models/branches.go
index 20988deed7..420a4b663a 100644
--- a/models/branches.go
+++ b/models/branches.go
@@ -209,6 +209,38 @@ func (protectBranch *ProtectedBranch) GetProtectedFilePatterns() []glob.Glob {
 	return extarr
 }
 
+// MergeBlockedByProtectedFiles returns true if merge is blocked by protected files change
+func (protectBranch *ProtectedBranch) MergeBlockedByProtectedFiles(pr *PullRequest) bool {
+	glob := protectBranch.GetProtectedFilePatterns()
+	if len(glob) == 0 {
+		return false
+	}
+
+	return len(pr.ChangedProtectedFiles) > 0
+}
+
+// IsProtectedFile return if path is protected
+func (protectBranch *ProtectedBranch) IsProtectedFile(patterns []glob.Glob, path string) bool {
+	if len(patterns) == 0 {
+		patterns = protectBranch.GetProtectedFilePatterns()
+		if len(patterns) == 0 {
+			return false
+		}
+	}
+
+	lpath := strings.ToLower(strings.TrimSpace(path))
+
+	r := false
+	for _, pat := range patterns {
+		if pat.Match(lpath) {
+			r = true
+			break
+		}
+	}
+
+	return r
+}
+
 // GetProtectedBranchByRepoID getting protected branch by repo ID
 func GetProtectedBranchByRepoID(repoID int64) ([]*ProtectedBranch, error) {
 	protectedBranches := make([]*ProtectedBranch, 0)
diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go
index 4e12181b15..0efcce30a9 100644
--- a/models/migrations/migrations.go
+++ b/models/migrations/migrations.go
@@ -244,6 +244,8 @@ var migrations = []Migration{
 	NewMigration("add Team review request support", addTeamReviewRequestSupport),
 	// v154 > v155
 	NewMigration("add timestamps to Star, Label, Follow, Watch and Collaboration", addTimeStamps),
+	// v155 -> v156
+	NewMigration("add changed_protected_files column for pull_request table", addChangedProtectedFilesPullRequestColumn),
 }
 
 // GetCurrentDBVersion returns the current db version
diff --git a/models/migrations/v155.go b/models/migrations/v155.go
new file mode 100644
index 0000000000..58d78b6cfb
--- /dev/null
+++ b/models/migrations/v155.go
@@ -0,0 +1,22 @@
+// Copyright 2020 The Gitea 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 migrations
+
+import (
+	"fmt"
+
+	"xorm.io/xorm"
+)
+
+func addChangedProtectedFilesPullRequestColumn(x *xorm.Engine) error {
+	type PullRequest struct {
+		ChangedProtectedFiles []string `xorm:"TEXT JSON"`
+	}
+
+	if err := x.Sync2(new(PullRequest)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
+	return nil
+}
diff --git a/models/pull.go b/models/pull.go
index 9f1f485266..9b6f0830d7 100644
--- a/models/pull.go
+++ b/models/pull.go
@@ -45,6 +45,8 @@ type PullRequest struct {
 	CommitsAhead    int
 	CommitsBehind   int
 
+	ChangedProtectedFiles []string `xorm:"TEXT JSON"`
+
 	IssueID int64  `xorm:"INDEX"`
 	Issue   *Issue `xorm:"-"`
 	Index   int64