1 files changed, 203 insertions, 0 deletions
diff --git a/vendor/github.com/nlopes/slack/misc.go b/vendor/github.com/nlopes/slack/misc.go
new file mode 100644
index 00000000..e890aa8f
--- /dev/null
+++ b/vendor/github.com/nlopes/slack/misc.go
@@ -0,0 +1,203 @@
+package slack
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"mime/multipart"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// HTTPRequester defines the minimal interface needed for an http.Client to be implemented.
+//
+// Use it in conjunction with the SetHTTPClient function to allow for other capabilities
+// like a tracing http.Client
+type HTTPRequester interface {
+	Do(*http.Request) (*http.Response, error)
+}
+
+var customHTTPClient HTTPRequester
+
+// HTTPClient sets a custom http.Client
+// deprecated: in favor of SetHTTPClient()
+var HTTPClient = &http.Client{}
+
+type WebResponse struct {
+	Ok    bool      `json:"ok"`
+	Error *WebError `json:"error"`
+}
+
+type WebError string
+
+func (s WebError) Error() string {
+	return string(s)
+}
+
+type RateLimitedError struct {
+	RetryAfter time.Duration
+}
+
+func (e *RateLimitedError) Error() string {
+	return fmt.Sprintf("Slack rate limit exceeded, retry after %s", e.RetryAfter)
+}
+
+func fileUploadReq(ctx context.Context, path, fieldname, filename string, values url.Values, r io.Reader) (*http.Request, error) {
+	body := &bytes.Buffer{}
+	wr := multipart.NewWriter(body)
+
+	ioWriter, err := wr.CreateFormFile(fieldname, filename)
+	if err != nil {
+		wr.Close()
+		return nil, err
+	}
+	_, err = io.Copy(ioWriter, r)
+	if err != nil {
+		wr.Close()
+		return nil, err
+	}
+	// Close the multipart writer or the footer won't be written
+	wr.Close()
+	req, err := http.NewRequest("POST", path, body)
+	req = req.WithContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Add("Content-Type", wr.FormDataContentType())
+	req.URL.RawQuery = (values).Encode()
+	return req, nil
+}
+
+func parseResponseBody(body io.ReadCloser, intf *interface{}, debug bool) error {
+	response, err := ioutil.ReadAll(body)
+	if err != nil {
+		return err
+	}
+
+	// FIXME: will be api.Debugf
+	if debug {
+		logger.Printf("parseResponseBody: %s\n", string(response))
+	}
+
+	return json.Unmarshal(response, &intf)
+}
+
+func postLocalWithMultipartResponse(ctx context.Context, path, fpath, fieldname string, values url.Values, intf interface{}, debug bool) 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, path, filepath.Base(fpath), fieldname, values, file, intf, debug)
+}
+
+func postWithMultipartResponse(ctx context.Context, path, name, fieldname string, values url.Values, r io.Reader, intf interface{}, debug bool) error {
+	req, err := fileUploadReq(ctx, SLACK_API+path, fieldname, name, values, r)
+	if err != nil {
+		return err
+	}
+	req = req.WithContext(ctx)
+	resp, err := getHTTPClient().Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	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, debug)
+		return fmt.Errorf("Slack server error: %s.", resp.Status)
+	}
+
+	return parseResponseBody(resp.Body, &intf, debug)
+}
+
+func postForm(ctx context.Context, endpoint string, values url.Values, intf interface{}, debug bool) error {
+	reqBody := strings.NewReader(values.Encode())
+	req, err := http.NewRequest("POST", endpoint, reqBody)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	req = req.WithContext(ctx)
+	resp, err := getHTTPClient().Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	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, debug)
+		return fmt.Errorf("Slack server error: %s.", resp.Status)
+	}
+
+	return parseResponseBody(resp.Body, &intf, debug)
+}
+
+func post(ctx context.Context, path string, values url.Values, intf interface{}, debug bool) error {
+	return postForm(ctx, SLACK_API+path, values, intf, debug)
+}
+
+func parseAdminResponse(ctx context.Context, method string, teamName string, values url.Values, intf interface{}, debug bool) error {
+	endpoint := fmt.Sprintf(SLACK_WEB_API_FORMAT, teamName, method, time.Now().Unix())
+	return postForm(ctx, endpoint, values, intf, debug)
+}
+
+func logResponse(resp *http.Response, debug bool) error {
+	if debug {
+		text, err := httputil.DumpResponse(resp, true)
+		if err != nil {
+			return err
+		}
+
+		logger.Print(string(text))
+	}
+
+	return nil
+}
+
+func getHTTPClient() HTTPRequester {
+	if customHTTPClient != nil {
+		return customHTTPClient
+	}
+
+	return HTTPClient
+}
+
+// SetHTTPClient allows you to specify a custom http.Client
+// Use this instead of the package level HTTPClient variable if you want to use a custom client like the
+// Stackdriver Trace HTTPClient https://godoc.org/cloud.google.com/go/trace#HTTPClient
+func SetHTTPClient(client HTTPRequester) {
+	customHTTPClient = client
+}