mirror of
https://github.com/42wim/matterbridge
synced 2024-11-15 06:12:55 +00:00
350 lines
8.5 KiB
Go
350 lines
8.5 KiB
Go
package slack
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"mime"
|
|
"mime/multipart"
|
|
"net/http"
|
|
"net/http/httputil"
|
|
"net/url"
|
|
"os"
|
|
"path/filepath"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
// SlackResponse handles parsing out errors from the web api.
|
|
type SlackResponse struct {
|
|
Ok bool `json:"ok"`
|
|
Error string `json:"error"`
|
|
ResponseMetadata ResponseMetadata `json:"response_metadata"`
|
|
}
|
|
|
|
func (t SlackResponse) Err() error {
|
|
if t.Ok {
|
|
return nil
|
|
}
|
|
|
|
// handle pure text based responses like chat.post
|
|
// which while they have a slack response in their data structure
|
|
// it doesn't actually get set during parsing.
|
|
if strings.TrimSpace(t.Error) == "" {
|
|
return nil
|
|
}
|
|
|
|
return SlackErrorResponse{Err: t.Error, ResponseMetadata: t.ResponseMetadata}
|
|
}
|
|
|
|
// SlackErrorResponse brings along the metadata of errors returned by the Slack API.
|
|
type SlackErrorResponse struct {
|
|
Err string
|
|
ResponseMetadata ResponseMetadata
|
|
}
|
|
|
|
func (r SlackErrorResponse) Error() string { return r.Err }
|
|
|
|
// RateLimitedError represents the rate limit response from slack
|
|
type RateLimitedError struct {
|
|
RetryAfter time.Duration
|
|
}
|
|
|
|
func (e *RateLimitedError) Error() string {
|
|
return fmt.Sprintf("slack rate limit exceeded, retry after %s", e.RetryAfter)
|
|
}
|
|
|
|
func (e *RateLimitedError) Retryable() bool {
|
|
return true
|
|
}
|
|
|
|
func fileUploadReq(ctx context.Context, path string, values url.Values, r io.Reader) (*http.Request, error) {
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodPost, path, r)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
req.URL.RawQuery = values.Encode()
|
|
return req, nil
|
|
}
|
|
|
|
func downloadFile(ctx context.Context, client httpClient, token string, downloadURL string, writer io.Writer, d Debug) error {
|
|
if downloadURL == "" {
|
|
return fmt.Errorf("received empty download URL")
|
|
}
|
|
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodGet, downloadURL, &bytes.Buffer{})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var bearer = "Bearer " + token
|
|
req.Header.Add("Authorization", bearer)
|
|
|
|
resp, err := client.Do(req)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
defer resp.Body.Close()
|
|
|
|
err = checkStatusCode(resp, d)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = io.Copy(writer, resp.Body)
|
|
|
|
return err
|
|
}
|
|
|
|
func formReq(ctx context.Context, endpoint string, values url.Values) (req *http.Request, err error) {
|
|
if req, err = http.NewRequestWithContext(ctx, http.MethodPost, endpoint, strings.NewReader(values.Encode())); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
|
|
return req, nil
|
|
}
|
|
|
|
func jsonReq(ctx context.Context, endpoint string, body interface{}) (req *http.Request, err error) {
|
|
buffer := bytes.NewBuffer([]byte{})
|
|
if err = json.NewEncoder(buffer).Encode(body); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if req, err = http.NewRequestWithContext(ctx, http.MethodPost, endpoint, buffer); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
req.Header.Set("Content-Type", "application/json; charset=utf-8")
|
|
return req, nil
|
|
}
|
|
|
|
func parseResponseBody(body io.ReadCloser, intf interface{}, d Debug) error {
|
|
response, err := ioutil.ReadAll(body)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if d.Debug() {
|
|
d.Debugln("parseResponseBody", string(response))
|
|
}
|
|
|
|
return json.Unmarshal(response, intf)
|
|
}
|
|
|
|
func postLocalWithMultipartResponse(ctx context.Context, client httpClient, method, fpath, fieldname, token string, values url.Values, intf interface{}, d Debug) error {
|
|
fullpath, err := filepath.Abs(fpath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
file, err := os.Open(fullpath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer file.Close()
|
|
|
|
return postWithMultipartResponse(ctx, client, method, filepath.Base(fpath), fieldname, token, values, file, intf, d)
|
|
}
|
|
|
|
func postWithMultipartResponse(ctx context.Context, client httpClient, path, name, fieldname, token string, values url.Values, r io.Reader, intf interface{}, d Debug) error {
|
|
pipeReader, pipeWriter := io.Pipe()
|
|
wr := multipart.NewWriter(pipeWriter)
|
|
errc := make(chan error)
|
|
go func() {
|
|
defer pipeWriter.Close()
|
|
ioWriter, err := wr.CreateFormFile(fieldname, name)
|
|
if err != nil {
|
|
errc <- err
|
|
return
|
|
}
|
|
_, err = io.Copy(ioWriter, r)
|
|
if err != nil {
|
|
errc <- err
|
|
return
|
|
}
|
|
if err = wr.Close(); err != nil {
|
|
errc <- err
|
|
return
|
|
}
|
|
}()
|
|
req, err := fileUploadReq(ctx, path, values, pipeReader)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
req.Header.Add("Content-Type", wr.FormDataContentType())
|
|
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
|
|
resp, err := client.Do(req)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
err = checkStatusCode(resp, d)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
select {
|
|
case err = <-errc:
|
|
return err
|
|
default:
|
|
return newJSONParser(intf)(resp)
|
|
}
|
|
}
|
|
|
|
func doPost(ctx context.Context, client httpClient, req *http.Request, parser responseParser, d Debug) error {
|
|
resp, err := client.Do(req)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
err = checkStatusCode(resp, d)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return parser(resp)
|
|
}
|
|
|
|
// post JSON.
|
|
func postJSON(ctx context.Context, client httpClient, endpoint, token string, json []byte, intf interface{}, d Debug) error {
|
|
reqBody := bytes.NewBuffer(json)
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, reqBody)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
req.Header.Set("Content-Type", "application/json")
|
|
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
|
|
|
|
return doPost(ctx, client, req, newJSONParser(intf), d)
|
|
}
|
|
|
|
// post a url encoded form.
|
|
func postForm(ctx context.Context, client httpClient, endpoint string, values url.Values, intf interface{}, d Debug) error {
|
|
reqBody := strings.NewReader(values.Encode())
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, reqBody)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
|
|
return doPost(ctx, client, req, newJSONParser(intf), d)
|
|
}
|
|
|
|
func getResource(ctx context.Context, client httpClient, endpoint, token string, values url.Values, intf interface{}, d Debug) error {
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
|
|
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
|
|
|
|
req.URL.RawQuery = values.Encode()
|
|
|
|
return doPost(ctx, client, req, newJSONParser(intf), d)
|
|
}
|
|
|
|
func parseAdminResponse(ctx context.Context, client httpClient, method string, teamName string, values url.Values, intf interface{}, d Debug) error {
|
|
endpoint := fmt.Sprintf(WEBAPIURLFormat, teamName, method, time.Now().Unix())
|
|
return postForm(ctx, client, endpoint, values, intf, d)
|
|
}
|
|
|
|
func logResponse(resp *http.Response, d Debug) error {
|
|
if d.Debug() {
|
|
text, err := httputil.DumpResponse(resp, true)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
d.Debugln(string(text))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func okJSONHandler(rw http.ResponseWriter, r *http.Request) {
|
|
rw.Header().Set("Content-Type", "application/json")
|
|
response, _ := json.Marshal(SlackResponse{
|
|
Ok: true,
|
|
})
|
|
rw.Write(response)
|
|
}
|
|
|
|
// timerReset safely reset a timer, see time.Timer.Reset for details.
|
|
func timerReset(t *time.Timer, d time.Duration) {
|
|
if !t.Stop() {
|
|
<-t.C
|
|
}
|
|
t.Reset(d)
|
|
}
|
|
|
|
func checkStatusCode(resp *http.Response, d Debug) error {
|
|
if resp.StatusCode == http.StatusTooManyRequests {
|
|
retry, err := strconv.ParseInt(resp.Header.Get("Retry-After"), 10, 64)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return &RateLimitedError{time.Duration(retry) * time.Second}
|
|
}
|
|
|
|
// Slack seems to send an HTML body along with 5xx error codes. Don't parse it.
|
|
if resp.StatusCode != http.StatusOK {
|
|
logResponse(resp, d)
|
|
return StatusCodeError{Code: resp.StatusCode, Status: resp.Status}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
type responseParser func(*http.Response) error
|
|
|
|
func newJSONParser(dst interface{}) responseParser {
|
|
return func(resp *http.Response) error {
|
|
if dst == nil {
|
|
return nil
|
|
}
|
|
return json.NewDecoder(resp.Body).Decode(dst)
|
|
}
|
|
}
|
|
|
|
func newTextParser(dst interface{}) responseParser {
|
|
return func(resp *http.Response) error {
|
|
b, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !bytes.Equal(b, []byte("ok")) {
|
|
return errors.New(string(b))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func newContentTypeParser(dst interface{}) responseParser {
|
|
return func(req *http.Response) (err error) {
|
|
var (
|
|
ctype string
|
|
)
|
|
|
|
if ctype, _, err = mime.ParseMediaType(req.Header.Get("Content-Type")); err != nil {
|
|
return err
|
|
}
|
|
|
|
switch ctype {
|
|
case "application/json":
|
|
return newJSONParser(dst)(req)
|
|
default:
|
|
return newTextParser(dst)(req)
|
|
}
|
|
}
|
|
}
|