Add support for filepath repository rules (#3233)

Author: grahamhar

github/github-accessors.go

@@ -79,6 +79,11 @@ type RulePatternParameters struct {
 	Pattern  string `json:"pattern"`
 }
 
+// RuleFileParameters represents a list of file paths.
+type RuleFileParameters struct {
+	RestrictedFilePaths *[]string `json:"restricted_file_paths"`
+}
+
 // UpdateAllowsFetchAndMergeRuleParameters represents the update rule parameters.
 type UpdateAllowsFetchAndMergeRuleParameters struct {
 	UpdateAllowsFetchAndMerge bool `json:"update_allows_fetch_and_merge"`
@@ -213,6 +218,15 @@ func (r *RepositoryRule) UnmarshalJSON(data []byte) error {
 		bytes, _ := json.Marshal(params)
 		rawParams := json.RawMessage(bytes)
 
+		r.Parameters = &rawParams
+	case "file_path_restriction":
+		params := RuleFileParameters{}
+		if err := json.Unmarshal(*RepositoryRule.Parameters, &params); err != nil {
+			return err
+		}
+		bytes, _ := json.Marshal(params)
+		rawParams := json.RawMessage(bytes)
+
 		r.Parameters = &rawParams
 	default:
 		r.Type = ""
@@ -390,6 +404,18 @@ func NewRequiredWorkflowsRule(params *RequiredWorkflowsRuleParameters) (rule *Re
 	}
 }
 
+// NewFilePathRestrictionRule creates a rule to restrict file paths from being pushed to.
+func NewFilePathRestrictionRule(params *RuleFileParameters) (rule *RepositoryRule) {
+	bytes, _ := json.Marshal(params)
+
+	rawParams := json.RawMessage(bytes)
+
+	return &RepositoryRule{
+		Type:       "file_path_restriction",
+		Parameters: &rawParams,
+	}
+}
+
 // Ruleset represents a GitHub ruleset object.
 type Ruleset struct {
 	ID   *int64 `json:"id,omitempty"`

github/github-accessors_test.go

@@ -182,6 +182,20 @@ func TestRepositoryRule_UnmarshalJSON(t *testing.T) {
 			},
 			wantErr: true,
 		},
+		"Valid file_path_restriction params": {
+			data: `{"type":"file_path_restriction","parameters":{"restricted_file_paths":["/a/file"]}}`,
+			want: NewFilePathRestrictionRule(&RuleFileParameters{
+				RestrictedFilePaths: &[]string{"/a/file"},
+			}),
+		},
+		"Invalid file_path_restriction params": {
+			data: `{"type":"file_path_restriction","parameters":{"restricted_file_paths":true}}`,
+			want: &RepositoryRule{
+				Type:       "file_path_restriction",
+				Parameters: nil,
+			},
+			wantErr: true,
+		},
 		"Valid pull_request params": {
 			data: `{
 				"type":"pull_request",