traefik/vendor/github.com/exoscale/egoscale/runstatus.go
2019-03-14 11:04:04 +01:00

131 lines
3.2 KiB
Go

package egoscale
import (
"context"
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"time"
)
// RunstatusValidationErrorResponse represents an error in the API
type RunstatusValidationErrorResponse map[string][]string
// RunstatusErrorResponse represents the default errors
type RunstatusErrorResponse struct {
Detail string `json:"detail"`
}
// runstatusPagesURL is the only URL that cannot be guessed
const runstatusPagesURL = "/pages"
// Error formats the DNSerror into a string
func (req RunstatusErrorResponse) Error() string {
return fmt.Sprintf("Runstatus error: %s", req.Detail)
}
// Error formats the DNSerror into a string
func (req RunstatusValidationErrorResponse) Error() string {
if len(req) > 0 {
errs := []string{}
for name, ss := range req {
if len(ss) > 0 {
errs = append(errs, fmt.Sprintf("%s: %s", name, strings.Join(ss, ", ")))
}
}
return fmt.Sprintf("Runstatus error: %s", strings.Join(errs, "; "))
}
return fmt.Sprintf("Runstatus error")
}
func (client *Client) runstatusRequest(ctx context.Context, uri string, structParam interface{}, method string) (json.RawMessage, error) {
reqURL, err := url.Parse(uri)
if err != nil {
return nil, err
}
if reqURL.Scheme == "" {
return nil, fmt.Errorf("only absolute URI are considered valid, got %q", uri)
}
var params string
if structParam != nil {
m, err := json.Marshal(structParam)
if err != nil {
return nil, err
}
params = string(m)
}
req, err := http.NewRequest(method, reqURL.String(), strings.NewReader(params))
if err != nil {
return nil, err
}
time := time.Now().Local().Format("2006-01-02T15:04:05-0700")
payload := fmt.Sprintf("%s%s%s", req.URL.String(), time, params)
mac := hmac.New(sha256.New, []byte(client.apiSecret))
_, err = mac.Write([]byte(payload))
if err != nil {
return nil, err
}
signature := hex.EncodeToString(mac.Sum(nil))
var hdr = make(http.Header)
hdr.Add("Authorization", fmt.Sprintf("Exoscale-HMAC-SHA256 %s:%s", client.APIKey, signature))
hdr.Add("Exoscale-Date", time)
hdr.Add("User-Agent", fmt.Sprintf("exoscale/egoscale (%v)", Version))
hdr.Add("Accept", "application/json")
if params != "" {
hdr.Add("Content-Type", "application/json")
}
req.Header = hdr
req = req.WithContext(ctx)
resp, err := client.HTTPClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close() // nolint: errcheck
if resp.StatusCode == 204 {
if method != "DELETE" {
return nil, fmt.Errorf("only DELETE is expected to produce 204, was %q", method)
}
return nil, nil
}
contentType := resp.Header.Get("content-type")
if !strings.Contains(contentType, "application/json") {
return nil, fmt.Errorf(`response %d content-type expected to be "application/json", got %q`, resp.StatusCode, contentType)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if resp.StatusCode >= 400 {
rerr := new(RunstatusValidationErrorResponse)
if err := json.Unmarshal(b, rerr); err == nil {
return nil, rerr
}
rverr := new(RunstatusErrorResponse)
if err := json.Unmarshal(b, rverr); err != nil {
return nil, err
}
return nil, rverr
}
return b, nil
}