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|
package client
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"time"
jwt "github.com/dgrijalva/jwt-go"
"gitlab.com/gitlab-org/gitlab-pages/internal/httptransport"
"gitlab.com/gitlab-org/gitlab-pages/internal/source/gitlab/api"
)
// Client is a HTTP client to access Pages internal API
type Client struct {
secretKey []byte
baseURL *url.URL
httpClient *http.Client
jwtTokenExpiry time.Duration
}
// NewClient initializes and returns new Client baseUrl is
// appConfig.GitLabServer secretKey is appConfig.GitLabAPISecretKey
func NewClient(baseURL string, secretKey []byte, connectionTimeout, jwtTokenExpiry time.Duration) (*Client, error) {
if len(baseURL) == 0 || len(secretKey) == 0 {
return nil, errors.New("GitLab API URL or API secret has not been provided")
}
url, err := url.Parse(baseURL)
if err != nil {
return nil, err
}
if connectionTimeout == 0 {
return nil, errors.New("GitLab HTTP client connection timeout has not been provided")
}
if jwtTokenExpiry == 0 {
return nil, errors.New("GitLab JWT token expiry has not been provided")
}
return &Client{
secretKey: secretKey,
baseURL: url,
httpClient: &http.Client{
Timeout: connectionTimeout,
Transport: httptransport.Transport,
},
jwtTokenExpiry: jwtTokenExpiry,
}, nil
}
// NewFromConfig creates a new client from Config struct
func NewFromConfig(config Config) (*Client, error) {
return NewClient(config.GitlabServerURL(), config.GitlabAPISecret(), config.GitlabClientConnectionTimeout(), config.GitlabJWTTokenExpiry())
}
// Resolve returns a VirtualDomain configuration wrapped into a Lookup for a
// given host. It implements api.Resolve type.
func (gc *Client) Resolve(ctx context.Context, host string) *api.Lookup {
lookup := gc.GetLookup(ctx, host)
return &lookup
}
// GetLookup returns a VirtualDomain configuration wrapped into a Lookup for a
// given host
func (gc *Client) GetLookup(ctx context.Context, host string) api.Lookup {
params := url.Values{}
params.Set("host", host)
resp, err := gc.get(ctx, "/api/v4/internal/pages", params)
if err != nil {
return api.Lookup{Name: host, Error: err}
}
if resp == nil {
return api.Lookup{Name: host}
}
lookup := api.Lookup{Name: host}
lookup.Error = json.NewDecoder(resp.Body).Decode(&lookup.Domain)
return lookup
}
func (gc *Client) get(ctx context.Context, path string, params url.Values) (*http.Response, error) {
endpoint, err := gc.endpoint(path, params)
if err != nil {
return nil, err
}
req, err := gc.request(ctx, "GET", endpoint)
if err != nil {
return nil, err
}
resp, err := gc.httpClient.Do(req)
if err != nil {
return nil, err
}
if resp == nil {
return nil, errors.New("unknown response")
}
// StatusOK means we should return the API response
if resp.StatusCode == http.StatusOK {
return resp, nil
}
io.Copy(ioutil.Discard, resp.Body)
resp.Body.Close()
// StatusNoContent means that a domain does not exist, it is not an error
if resp.StatusCode == http.StatusNoContent {
return nil, nil
}
return nil, fmt.Errorf("HTTP status: %d", resp.StatusCode)
}
func (gc *Client) endpoint(path string, params url.Values) (*url.URL, error) {
endpoint, err := gc.baseURL.Parse(path)
if err != nil {
return nil, err
}
endpoint.RawQuery = params.Encode()
return endpoint, nil
}
func (gc *Client) request(ctx context.Context, method string, endpoint *url.URL) (*http.Request, error) {
req, err := http.NewRequest(method, endpoint.String(), nil)
if err != nil {
return nil, err
}
req = req.WithContext(ctx)
token, err := gc.token()
if err != nil {
return nil, err
}
req.Header.Set("Gitlab-Pages-Api-Request", token)
return req, nil
}
func (gc *Client) token() (string, error) {
claims := jwt.StandardClaims{
Issuer: "gitlab-pages",
ExpiresAt: time.Now().UTC().Add(gc.jwtTokenExpiry).Unix(),
}
token, err := jwt.NewWithClaims(jwt.SigningMethodHS256, claims).SignedString(gc.secretKey)
if err != nil {
return "", err
}
return token, nil
}
|
