Add support for MarketplacePurchaseEvent. (google#789)

GitHub API docs: https://developer.github.com/v3/activity/events/types/#marketplacepurchaseevent.

Fixes google#704.

github/activity_events.go

@@ -56,6 +56,8 @@ func (e *Event) ParsePayload() (payload interface{}, err error) {
 		payload = &IssuesEvent{}
 	case "LabelEvent":
 		payload = &LabelEvent{}
+	case "MarketplacePurchaseEvent":
+		payload = &MarketplacePurchaseEvent{}
 	case "MemberEvent":
 		payload = &MemberEvent{}
 	case "MembershipEvent":

github/event_types.go

@@ -268,6 +268,24 @@ type LabelEvent struct {
 	Installation *Installation `json:"installation,omitempty"`
 }
 
+// MarketplacePurchaseEvent is triggered when a user purchases, cancels, or changes
+// their GitHub Marketplace plan.
+// Webhook event name "marketplace_purchase".
+//
+// Github API docs: https://developer.github.com/v3/activity/events/types/#marketplacepurchaseevent
+type MarketplacePurchaseEvent struct {
+	// Action is the action that was performed. Possible values are:
+	// "purchased", "cancelled", "changed".
+	Action *string `json:"action,omitempty"`
+
+	// The following fields are only populated by Webhook events.
+	EffectiveDate               *Timestamp           `json:"effective_date,omitempty"`
+	MarketplacePurchase         *MarketplacePurchase `json:"marketplace_purchase,omitempty"`
+	PreviousMarketplacePurchase *MarketplacePurchase `json:"previous_marketplace_purchase,omitempty"`
+	Sender                      *User                `json:"sender,omitempty"`
+	Installation                *Installation        `json:"installation,omitempty"`
+}
+
 // MemberEvent is triggered when a user is added as a collaborator to a repository.
 // The Webhook event name is "member".
 //

github/messages.go

@@ -53,6 +53,7 @@ var (
 		"issue_comment":               "IssueCommentEvent",
 		"issues":                      "IssuesEvent",
 		"label":                       "LabelEvent",
+		"marketplace_purchase":        "MarketplacePurchaseEvent",
 		"member":                      "MemberEvent",
 		"membership":                  "MembershipEvent",
 		"milestone":                   "MilestoneEvent",

github/messages_test.go

@@ -210,6 +210,10 @@ func TestParseWebHook(t *testing.T) {
 			payload:     &LabelEvent{},
 			messageType: "label",
 		},
+		{
+			payload:     &MarketplacePurchaseEvent{},
+			messageType: "marketplace_purchase",
+		},
 		{
 			payload:     &MemberEvent{},
 			messageType: "member",