Added listing outside collaborators for an organization

github/orgs_outside_collaborators.go

@@ -0,0 +1,50 @@
+// Copyright 2017 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import "fmt"
+
+// ListOutsideCollaboratorsOptions specifies optional parameters to the
+// OrganizationsService.ListOutsideCollaborators method.
+type ListOutsideCollaboratorsOptions struct {
+	// Filter outside collaborators returned in the list. Possible values are:
+	// 2fa_disabled, all.  Default is "all".
+	Filter string `url:"filter,omitempty"`
+
+	ListOptions
+}
+
+// ListOutsideCollaborators lists outside collaborators of organization's repositories.
+// This will only work if the authenticated
+// user is an owner of the organization.
+//
+// Warning: The API may change without advance notice during the preview period.
+// Preview features are not supported for production use.
+//
+// GitHub API docs: https://developer.github.com/v3/orgs/outside_collaborators/#list-outside-collaborators
+func (s *OrganizationsService) ListOutsideCollaborators(org string, opt *ListOutsideCollaboratorsOptions) ([]*User, *Response, error) {
+	u := fmt.Sprintf("orgs/%v/outside_collaborators", org)
+	u, err := addOptions(u, opt)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeOrgMembershipPreview)
+
+	var members []*User
+	resp, err := s.client.Do(req, &members)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return members, resp, nil
+}

github/orgs_outside_collaborators_test.go

@@ -0,0 +1,47 @@
+// Copyright 2017 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"fmt"
+	"net/http"
+	"reflect"
+	"testing"
+)
+
+func TestOrganizationsService_ListOutsideCollaborators(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/orgs/o/outside_collaborators", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		testFormValues(t, r, values{
+			"filter": "2fa_disabled",
+			"page":   "2",
+		})
+		testHeader(t, r, "Accept", mediaTypeOrgMembershipPreview)
+		fmt.Fprint(w, `[{"id":1}]`)
+	})
+
+	opt := &ListOutsideCollaboratorsOptions{
+		Filter:      "2fa_disabled",
+		ListOptions: ListOptions{Page: 2},
+	}
+	members, _, err := client.Organizations.ListOutsideCollaborators("o", opt)
+	if err != nil {
+		t.Errorf("Organizations.ListOutsideCollaborators returned error: %v", err)
+	}
+
+	want := []*User{{ID: Int(1)}}
+	if !reflect.DeepEqual(members, want) {
+		t.Errorf("Organizations.ListOutsideCollaborators returned %+v, want %+v", members, want)
+	}
+}
+
+func TestOrganizationsService_ListOutsideCollaborators_invalidOrg(t *testing.T) {
+	_, _, err := client.Organizations.ListOutsideCollaborators("%", nil)
+	testURLParseError(t, err)
+}