Support commits reviewed through Piper (#1889)

Co-authored-by: Azeem Shaikh <azeems@google.com>

checks/code_review_test.go

@@ -232,6 +232,21 @@ func TestCodereview(t *testing.T) {
 				Score: 0,
 			},
 		},
+		{
+			name: "Valid piper commit",
+			commits: []clients.Commit{
+				{
+					SHA: "sha",
+					Committer: clients.User{
+						Login: "",
+					},
+					Message: "Title\nPiperOrigin-RevId: 444529962",
+				},
+			},
+			expected: checker.CheckResult{
+				Score: 10,
+			},
+		},
 	}
 
 	for _, tt := range tests {

checks/evaluation/code_review.go

@@ -22,11 +22,12 @@ import (
 	sce "github.com/ossf/scorecard/v4/errors"
 )
 
-var (
+const (
 	reviewPlatformGitHub      = "GitHub"
 	reviewPlatformProw        = "Prow"
 	reviewPlatformGerrit      = "Gerrit"
 	reviewPlatformPhabricator = "Phabricator"
+	reviewPlatformPiper       = "Piper"
 )
 
 // CodeReview applies the score policy for the Code-Review check.
@@ -43,11 +44,11 @@ func CodeReview(name string, dl checker.DetailLogger,
 	}
 
 	totalReviewed := map[string]int{
-		// The 4 platforms we support.
 		reviewPlatformGitHub:      0,
 		reviewPlatformProw:        0,
 		reviewPlatformGerrit:      0,
 		reviewPlatformPhabricator: 0,
+		reviewPlatformPiper:       0,
 	}
 
 	for i := range r.DefaultBranchCommits {
@@ -67,7 +68,7 @@ func CodeReview(name string, dl checker.DetailLogger,
 	if totalReviewed[reviewPlatformGitHub] == 0 &&
 		totalReviewed[reviewPlatformGerrit] == 0 &&
 		totalReviewed[reviewPlatformProw] == 0 &&
-		totalReviewed[reviewPlatformPhabricator] == 0 {
+		totalReviewed[reviewPlatformPhabricator] == 0 && totalReviewed[reviewPlatformPiper] == 0 {
 		return checker.CreateMinScoreResult(name, "no reviews found")
 	}
 
@@ -108,17 +109,15 @@ func getApprovedReviewSystem(c *checker.DefaultBranchCommit, dl checker.DetailLo
 	switch {
 	case isReviewedOnGitHub(c, dl):
 		return reviewPlatformGitHub
-
 	case isReviewedOnProw(c, dl):
 		return reviewPlatformProw
-
 	case isReviewedOnGerrit(c, dl):
 		return reviewPlatformGerrit
-
 	case isReviewedOnPhabricator(c, dl):
 		return reviewPlatformPhabricator
+	case isReviewedOnPiper(c, dl):
+		return reviewPlatformPiper
 	}
-
 	return ""
 }
 
@@ -212,3 +211,14 @@ func isReviewedOnPhabricator(c *checker.DefaultBranchCommit, dl checker.DetailLo
 	}
 	return false
 }
+
+func isReviewedOnPiper(c *checker.DefaultBranchCommit, dl checker.DetailLogger) bool {
+	m := c.CommitMessage
+	if strings.Contains(m, "\nPiperOrigin-RevId: ") {
+		dl.Debug(&checker.LogMessage{
+			Text: fmt.Sprintf("commit %s was approved through %s", c.SHA, reviewPlatformPhabricator),
+		})
+		return true
+	}
+	return false
+}