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gitlab.go
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gitlab.go
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// Package gitlab contains a directory provider for gitlab.
package gitlab
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"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 = "gitlab"
var (
defaultURL = &url.URL{
Scheme: "https",
Host: "gitlab.com",
}
)
type config struct {
httpClient *http.Client
serviceAccount *ServiceAccount
url *url.URL
}
// An Option updates the gitlab 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 gitlab.
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", "gitlab").Logger(),
}
}
// UserGroups gets the directory user groups for gitlab.
func (p *Provider) UserGroups(ctx context.Context) ([]*directory.Group, []*directory.User, error) {
if p.cfg.serviceAccount == nil {
return nil, nil, fmt.Errorf("gitlab: service account not defined")
}
p.log.Info().Msg("getting user groups")
groups, err := p.listGroups(ctx)
if err != nil {
return nil, nil, err
}
userIDToGroupIDs := map[int][]string{}
for _, group := range groups {
userIDs, err := p.listGroupMemberIDs(ctx, group.Id)
if err != nil {
return nil, nil, err
}
for _, userID := range userIDs {
userIDToGroupIDs[userID] = append(userIDToGroupIDs[userID], group.Id)
}
}
var users []*directory.User
for userID, groups := range userIDToGroupIDs {
user := &directory.User{
Id: databroker.GetUserID(Name, fmt.Sprint(userID)),
}
user.GroupIds = append(user.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 groups, users, nil
}
// listGroups returns a map, with key is group ID, element is group name.
func (p *Provider) listGroups(ctx context.Context) ([]*directory.Group, error) {
nextURL := p.cfg.url.ResolveReference(&url.URL{
Path: "/api/v4/groups",
}).String()
var groups []*directory.Group
for nextURL != "" {
var result []struct {
ID int `json:"id"`
Name string `json:"name"`
}
hdrs, err := p.apiGet(ctx, nextURL, &result)
if err != nil {
return nil, fmt.Errorf("gitlab: error querying groups: %w", err)
}
for _, r := range result {
groups = append(groups, &directory.Group{
Id: strconv.Itoa(r.ID),
Name: r.Name,
})
}
nextURL = getNextLink(hdrs)
}
return groups, nil
}
func (p *Provider) listGroupMemberIDs(ctx context.Context, groupID string) (userIDs []int, err error) {
nextURL := p.cfg.url.ResolveReference(&url.URL{
Path: fmt.Sprintf("/api/v4/groups/%s/members", groupID),
}).String()
for nextURL != "" {
var result []struct {
ID int `json:"id"`
}
hdrs, err := p.apiGet(ctx, nextURL, &result)
if err != nil {
return nil, fmt.Errorf("gitlab: error querying group members: %w", err)
}
for _, r := range result {
userIDs = append(userIDs, r.ID)
}
nextURL = getNextLink(hdrs)
}
return userIDs, nil
}
func (p *Provider) apiGet(ctx context.Context, uri string, out interface{}) (http.Header, error) {
req, err := http.NewRequestWithContext(ctx, "GET", uri, nil)
if err != nil {
return nil, fmt.Errorf("gitlab: failed to create HTTP request: %w", err)
}
req.Header.Set("Accept", "application/json")
req.Header.Set("Content-Type", "application/json")
req.Header.Set("PRIVATE-TOKEN", p.cfg.serviceAccount.PrivateToken)
res, err := p.cfg.httpClient.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode/100 != 2 {
return nil, fmt.Errorf("gitlab: error query api status_code=%d: %s", res.StatusCode, res.Status)
}
err = json.NewDecoder(res.Body).Decode(out)
if err != nil {
return nil, 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 Gitlab provider to query the Gitlab API.
type ServiceAccount struct {
PrivateToken string `json:"private_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.PrivateToken == "" {
return nil, fmt.Errorf("private_token is required")
}
return &serviceAccount, nil
}