Update: support configuration

This exposes settings for clients, so it's nice to be able to
access it directly.

instance.go

@@ -17,6 +17,17 @@ type Instance struct {
 	Stats          *InstanceStats    `json:"stats,omitempty"`
 	Languages      []string          `json:"languages"`
 	ContactAccount *Account          `json:"contact_account"`
+	Configuration  *InstanceConfig   `json:"configuration"`
+}
+
+type InstanceConfigMap map[string]int
+
+// InstanceConfig holds configuration accessible for clients.
+type InstanceConfig struct {
+	Accounts         *InstanceConfigMap     `json:"accounts"`
+	Statuses         *InstanceConfigMap     `json:"statuses"`
+	MediaAttachments map[string]interface{} `json:"media_attachments"`
+	Polls            *InstanceConfigMap     `json:"polls"`
 }
 
 // InstanceStats holds information for mastodon instance stats.
@@ -36,6 +47,11 @@ func (c *Client) GetInstance(ctx context.Context) (*Instance, error) {
 	return &instance, nil
 }
 
+// GetConfig returns InstanceConfig.
+func (c *Instance) GetConfig() *InstanceConfig {
+	return c.Configuration
+}
+
 // WeeklyActivity holds information for mastodon weekly activity.
 type WeeklyActivity struct {
 	Week          Unixtime `json:"week"`

instance_test.go

@@ -60,7 +60,7 @@ func TestGetInstanceMore(t *testing.T) {
 			http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
 			return
 		}
-		fmt.Fprintln(w, `{"title": "mastodon", "uri": "http://mstdn.example.com", "description": "test mastodon", "email": "mstdn@mstdn.example.com", "version": "0.0.1", "urls":{"foo":"http://stream1.example.com", "bar": "http://stream2.example.com"}, "thumbnail": "http://mstdn.example.com/logo.png", "stats":{"user_count":1, "status_count":2, "domain_count":3}}}`)
+		fmt.Fprintln(w, `{"title": "mastodon", "uri": "http://mstdn.example.com", "description": "test mastodon", "email": "mstdn@mstdn.example.com", "version": "0.0.1", "urls":{"foo":"http://stream1.example.com", "bar": "http://stream2.example.com"}, "thumbnail": "http://mstdn.example.com/logo.png", "configuration":{"accounts": {"max_featured_tags": 10}, "statuses": {"max_characters": 500}}, "stats":{"user_count":1, "status_count":2, "domain_count":3}}}`)
 	}))
 	defer ts.Close()
 
@@ -103,7 +103,7 @@ func TestGetInstanceMore(t *testing.T) {
 		t.Fatalf("want %q but %q", "http://mstdn.example.com/logo.png", ins.Thumbnail)
 	}
 	if ins.Stats == nil {
-		t.Fatal("status should be nil")
+		t.Fatal("stats should not be nil")
 	}
 	if ins.Stats.UserCount != 1 {
 		t.Fatalf("want %v but %v", 1, ins.Stats.UserCount)
@@ -114,6 +114,15 @@ func TestGetInstanceMore(t *testing.T) {
 	if ins.Stats.DomainCount != 3 {
 		t.Fatalf("want %v but %v", 3, ins.Stats.DomainCount)
 	}
+
+	cfg := ins.GetConfig()
+	if cfg.Accounts == nil {
+		t.Error("expected accounts to be non nil")
+	}
+	if cfg.Statuses == nil {
+		t.Error("expected statuses to be non nil")
+	}
+
 }
 
 func TestGetInstanceActivity(t *testing.T) {