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github.go
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github.go
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// Package github contains a directory provider for github.
package github
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"sort"
"strconv"
"github.com/rs/zerolog"
"github.com/tomnomnom/linkheader"
"github.com/pomerium/pomerium/internal/log"
"github.com/pomerium/pomerium/pkg/grpc/databroker"
"github.com/pomerium/pomerium/pkg/grpc/directory"
)
// Name is the provider name.
const Name = "github"
var (
defaultURL = &url.URL{
Scheme: "https",
Host: "api.github.com",
}
)
type config struct {
httpClient *http.Client
serviceAccount *ServiceAccount
url *url.URL
}
// An Option updates the github configuration.
type Option func(cfg *config)
// WithServiceAccount sets the service account in the config.
func WithServiceAccount(serviceAccount *ServiceAccount) Option {
return func(cfg *config) {
cfg.serviceAccount = serviceAccount
}
}
// WithHTTPClient sets the http client option.
func WithHTTPClient(httpClient *http.Client) Option {
return func(cfg *config) {
cfg.httpClient = httpClient
}
}
// WithURL sets the api url in the config.
func WithURL(u *url.URL) Option {
return func(cfg *config) {
cfg.url = u
}
}
func getConfig(options ...Option) *config {
cfg := new(config)
WithHTTPClient(http.DefaultClient)(cfg)
WithURL(defaultURL)(cfg)
for _, option := range options {
option(cfg)
}
return cfg
}
// The Provider retrieves users and groups from github.
type Provider struct {
cfg *config
log zerolog.Logger
}
// New creates a new Provider.
func New(options ...Option) *Provider {
return &Provider{
cfg: getConfig(options...),
log: log.With().Str("service", "directory").Str("provider", "github").Logger(),
}
}
// UserGroups gets the directory user groups for github.
func (p *Provider) UserGroups(ctx context.Context) ([]*directory.Group, []*directory.User, error) {
if p.cfg.serviceAccount == nil {
return nil, nil, fmt.Errorf("github: service account not defined")
}
orgSlugs, err := p.listOrgs(ctx)
if err != nil {
return nil, nil, err
}
userLoginToGroups := map[string][]string{}
var allGroups []*directory.Group
for _, orgSlug := range orgSlugs {
groups, err := p.listGroups(ctx, orgSlug)
if err != nil {
return nil, nil, err
}
for _, group := range groups {
userLogins, err := p.listTeamMembers(ctx, orgSlug, group.Name)
if err != nil {
return nil, nil, err
}
for _, userLogin := range userLogins {
userLoginToGroups[userLogin] = append(userLoginToGroups[userLogin], group.Id)
}
}
allGroups = append(allGroups, groups...)
}
var users []*directory.User
for userLogin, groups := range userLoginToGroups {
user := &directory.User{
Id: databroker.GetUserID(Name, userLogin),
GroupIds: groups,
}
sort.Strings(user.GroupIds)
users = append(users, user)
}
sort.Slice(users, func(i, j int) bool {
return users[i].GetId() < users[j].GetId()
})
return allGroups, users, nil
}
func (p *Provider) listOrgs(ctx context.Context) (orgSlugs []string, err error) {
nextURL := p.cfg.url.ResolveReference(&url.URL{
Path: "/user/orgs",
}).String()
for nextURL != "" {
var results []struct {
Login string `json:"login"`
}
hdrs, err := p.api(ctx, "GET", nextURL, nil, &results)
if err != nil {
return nil, err
}
for _, result := range results {
orgSlugs = append(orgSlugs, result.Login)
}
nextURL = getNextLink(hdrs)
}
return orgSlugs, nil
}
func (p *Provider) listGroups(ctx context.Context, orgSlug string) ([]*directory.Group, error) {
nextURL := p.cfg.url.ResolveReference(&url.URL{
Path: fmt.Sprintf("/orgs/%s/teams", orgSlug),
}).String()
var groups []*directory.Group
for nextURL != "" {
var results []struct {
ID int `json:"id"`
Slug string `json:"slug"`
}
hdrs, err := p.api(ctx, "GET", nextURL, nil, &results)
if err != nil {
return nil, err
}
for _, result := range results {
groups = append(groups, &directory.Group{
Id: strconv.Itoa(result.ID),
Name: result.Slug,
})
}
nextURL = getNextLink(hdrs)
}
return groups, nil
}
func (p *Provider) listTeamMembers(ctx context.Context, orgSlug, teamSlug string) (userLogins []string, err error) {
nextURL := p.cfg.url.ResolveReference(&url.URL{
Path: fmt.Sprintf("/orgs/%s/teams/%s/members", orgSlug, teamSlug),
}).String()
for nextURL != "" {
var results []struct {
Login string `json:"login"`
}
hdrs, err := p.api(ctx, "GET", nextURL, nil, &results)
if err != nil {
return nil, err
}
for _, result := range results {
userLogins = append(userLogins, result.Login)
}
nextURL = getNextLink(hdrs)
}
return userLogins, err
}
func (p *Provider) api(ctx context.Context, method string, apiURL string, in, out interface{}) (http.Header, error) {
var body io.Reader
if in != nil {
bs, err := json.Marshal(in)
if err != nil {
return nil, fmt.Errorf("github: failed to marshal api input")
}
body = bytes.NewReader(bs)
}
req, err := http.NewRequestWithContext(ctx, method, apiURL, body)
if err != nil {
return nil, fmt.Errorf("github: failed to create http request: %w", err)
}
req.SetBasicAuth(p.cfg.serviceAccount.Username, p.cfg.serviceAccount.PersonalAccessToken)
res, err := p.cfg.httpClient.Do(req)
if err != nil {
return nil, fmt.Errorf("github: failed to make http request: %w", err)
}
defer res.Body.Close()
if res.StatusCode/100 != 2 {
return nil, fmt.Errorf("github: error from API: %s", res.Status)
}
if out != nil {
err := json.NewDecoder(res.Body).Decode(out)
if err != nil {
return nil, fmt.Errorf("github: failed to decode json body: %w", err)
}
}
return res.Header, nil
}
func getNextLink(hdrs http.Header) string {
for _, link := range linkheader.ParseMultiple(hdrs.Values("Link")) {
if link.Rel == "next" {
return link.URL
}
}
return ""
}
// A ServiceAccount is used by the GitHub provider to query the GitHub API.
type ServiceAccount struct {
Username string `json:"username"`
PersonalAccessToken string `json:"personal_access_token"`
}
// ParseServiceAccount parses the service account in the config options.
func ParseServiceAccount(rawServiceAccount string) (*ServiceAccount, error) {
bs, err := base64.StdEncoding.DecodeString(rawServiceAccount)
if err != nil {
return nil, err
}
var serviceAccount ServiceAccount
err = json.Unmarshal(bs, &serviceAccount)
if err != nil {
return nil, err
}
if serviceAccount.Username == "" {
return nil, fmt.Errorf("username is required")
}
if serviceAccount.PersonalAccessToken == "" {
return nil, fmt.Errorf("personal_access_token is required")
}
return &serviceAccount, nil
}