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|
package client
import (
"context"
"encoding/json"
"errors"
"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
}
var (
errUnknown = errors.New("Unknown")
errNoContent = errors.New("No Content")
errUnauthorized = errors.New("Unauthorized")
errNotFound = errors.New("Not Found")
)
// TODO make these values configurable https://gitlab.com/gitlab-org/gitlab-pages/issues/274
var tokenTimeout = 30 * time.Second
var connectionTimeout = 10 * time.Second
// NewClient initializes and returns new Client baseUrl is
// appConfig.GitLabServer secretKey is appConfig.GitLabAPISecretKey
func NewClient(baseURL string, secretKey []byte) (*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
}
return &Client{
secretKey: secretKey,
baseURL: url,
httpClient: &http.Client{
Timeout: connectionTimeout,
Transport: httptransport.Transport,
},
}, nil
}
// NewFromConfig creates a new client from Config struct
func NewFromConfig(config Config) (*Client, error) {
return NewClient(config.GitlabServerURL(), config.GitlabAPISecret())
}
// GetLookup returns a VirtualDomain configuration wrap into a Lookup for a
// given host
func (gc *Client) GetLookup(ctx context.Context, host string) api.Lookup {
lookup := api.Lookup{Name: host}
params := url.Values{}
params.Set("host", host)
resp, status, err := gc.get(ctx, "/api/v4/internal/pages", params)
if resp != nil {
defer resp.Body.Close()
} else {
err = errors.New("empty response returned")
}
lookup.Status = status
lookup.Error = err
if err != nil {
return lookup
}
err = json.NewDecoder(resp.Body).Decode(&lookup.Domain)
if err != nil {
lookup.Error = err
return lookup
}
return lookup
}
func (gc *Client) get(ctx context.Context, path string, params url.Values) (*http.Response, int, error) {
endpoint, err := gc.endpoint(path, params)
if err != nil {
return nil, 0, err
}
req, err := gc.request(ctx, "GET", endpoint)
if err != nil {
return nil, 0, err
}
resp, err := gc.httpClient.Do(req)
if err != nil {
return nil, 0, err
}
switch {
case resp.StatusCode == http.StatusOK:
return resp, resp.StatusCode, nil
case resp.StatusCode == http.StatusNoContent:
return resp, resp.StatusCode, errNoContent
case resp.StatusCode == http.StatusUnauthorized:
return resp, resp.StatusCode, errUnauthorized
case resp.StatusCode == http.StatusNotFound:
return resp, resp.StatusCode, errNotFound
default:
return resp, resp.StatusCode, errUnknown
}
}
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("GET", 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().Add(tokenTimeout).Unix(),
}
token, err := jwt.NewWithClaims(jwt.SigningMethodHS256, claims).SignedString(gc.secretKey)
if err != nil {
return "", err
}
return token, nil
}
|
