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package client
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
"time"
"gitlab.com/gitlab-org/labkit/correlation"
log "github.com/sirupsen/logrus"
)
const (
internalApiPath = "/api/v4/internal"
secretHeaderName = "Gitlab-Shared-Secret"
defaultUserAgent = "GitLab-Shell"
)
type ErrorResponse struct {
Message string `json:"message"`
}
type GitlabNetClient struct {
httpClient *HttpClient
user string
password string
secret string
userAgent string
}
func NewGitlabNetClient(
user,
password,
secret string,
httpClient *HttpClient,
) (*GitlabNetClient, error) {
if httpClient == nil {
return nil, fmt.Errorf("Unsupported protocol")
}
return &GitlabNetClient{
httpClient: httpClient,
user: user,
password: password,
secret: secret,
userAgent: defaultUserAgent,
}, nil
}
// SetUserAgent overrides the default user agent for the User-Agent header field
// for subsequent requests for the GitlabNetClient
func (c *GitlabNetClient) SetUserAgent(ua string) {
c.userAgent = ua
}
func normalizePath(path string) string {
if !strings.HasPrefix(path, "/") {
path = "/" + path
}
if !strings.HasPrefix(path, internalApiPath) {
path = internalApiPath + path
}
return path
}
func newRequest(ctx context.Context, method, host, path string, data interface{}) (*http.Request, string, error) {
var jsonReader io.Reader
if data != nil {
jsonData, err := json.Marshal(data)
if err != nil {
return nil, "", err
}
jsonReader = bytes.NewReader(jsonData)
}
request, err := http.NewRequestWithContext(ctx, method, host+path, jsonReader)
if err != nil {
return nil, "", err
}
correlationID := correlation.ExtractFromContext(ctx)
return request, correlationID, nil
}
func parseError(resp *http.Response) error {
if resp.StatusCode >= 200 && resp.StatusCode <= 399 {
return nil
}
defer resp.Body.Close()
parsedResponse := &ErrorResponse{}
if err := json.NewDecoder(resp.Body).Decode(parsedResponse); err != nil {
return fmt.Errorf("Internal API error (%v)", resp.StatusCode)
} else {
return fmt.Errorf(parsedResponse.Message)
}
}
func (c *GitlabNetClient) Get(ctx context.Context, path string) (*http.Response, error) {
return c.DoRequest(ctx, http.MethodGet, normalizePath(path), nil)
}
func (c *GitlabNetClient) Post(ctx context.Context, path string, data interface{}) (*http.Response, error) {
return c.DoRequest(ctx, http.MethodPost, normalizePath(path), data)
}
func (c *GitlabNetClient) DoRequest(ctx context.Context, method, path string, data interface{}) (*http.Response, error) {
request, correlationID, err := newRequest(ctx, method, c.httpClient.Host, path, data)
if err != nil {
return nil, err
}
user, password := c.user, c.password
if user != "" && password != "" {
request.SetBasicAuth(user, password)
}
encodedSecret := base64.StdEncoding.EncodeToString([]byte(c.secret))
request.Header.Set(secretHeaderName, encodedSecret)
request.Header.Add("Content-Type", "application/json")
request.Header.Add("User-Agent", c.userAgent)
request.Close = true
start := time.Now()
response, err := c.httpClient.Do(request)
fields := log.Fields{
"correlation_id": correlationID,
"method": method,
"url": request.URL.String(),
"duration_ms": time.Since(start) / time.Millisecond,
}
logger := log.WithFields(fields)
if err != nil {
logger.WithError(err).Error("Internal API unreachable")
return nil, fmt.Errorf("Internal API unreachable")
}
if response != nil {
logger = logger.WithField("status", response.StatusCode)
}
if err := parseError(response); err != nil {
logger.WithError(err).Error("Internal API error")
return nil, err
}
logger.Info("Finished HTTP request")
return response, nil
}
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