SendFile (#23)

* Add SendFile and SendImage

* Add DeleteFile\DeleteImage

channel.go

@@ -2,6 +2,7 @@ package stream_chat //nolint: golint
 
 import (
 	"errors"
+	"io"
 	"net/http"
 	"net/url"
 	"path"
@@ -325,6 +326,50 @@ func (c *Client) CreateChannel(chanType, chanID, userID string, data map[string]
 	return ch, err
 }
 
+type SendFileRequest struct {
+	Reader io.Reader `json:"-"`
+	// name of the file would be stored
+	FileName string
+	// User object; required
+	User *User
+	// file content type, required for SendImage
+	ContentType string
+}
+
+// SendFile sends file to the channel. Returns file url or error
+func (ch *Channel) SendFile(request SendFileRequest) (string, error) {
+	p := path.Join("channels", url.PathEscape(ch.Type), url.PathEscape(ch.ID), "file")
+
+	return ch.client.sendFile(p, request)
+}
+
+// SendFile sends image to the channel. Returns file url or error
+func (ch *Channel) SendImage(request SendFileRequest) (string, error) {
+	p := path.Join("channels", url.PathEscape(ch.Type), url.PathEscape(ch.ID), "image")
+
+	return ch.client.sendFile(p, request)
+}
+
+// DeleteFile removes uploaded file
+func (ch *Channel) DeleteFile(location string) error {
+	p := path.Join("channels", url.PathEscape(ch.Type), url.PathEscape(ch.ID), "file")
+
+	var params = url.Values{}
+	params.Set("url", location)
+
+	return ch.client.makeRequest(http.MethodDelete, p, params, nil, nil)
+}
+
+// DeleteImage removes uploaded image
+func (ch *Channel) DeleteImage(location string) error {
+	p := path.Join("channels", url.PathEscape(ch.Type), url.PathEscape(ch.ID), "image")
+
+	var params = url.Values{}
+	params.Set("url", location)
+
+	return ch.client.makeRequest(http.MethodDelete, p, params, nil, nil)
+}
+
 // todo: cleanup this
 func (ch *Channel) refresh() error {
 	options := map[string]interface{}{

channel_test.go

@@ -1,6 +1,8 @@
 package stream_chat // nolint: golint
 
 import (
+	"os"
+	"path"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -255,3 +257,72 @@ func TestChannel_DemoteModerators(t *testing.T) {
 func TestChannel_UnBanUser(t *testing.T) {
 
 }
+
+func TestChannel_SendFile(t *testing.T) {
+	c := initClient(t)
+	ch := initChannel(t, c)
+
+	var url string
+
+	t.Run("Send file", func(t *testing.T) {
+		file, err := os.Open(path.Join("testdata", "helloworld.txt"))
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		url, err = ch.SendFile(SendFileRequest{
+			Reader:   file,
+			FileName: "HelloWorld.txt",
+			User:     randomUser(),
+		})
+		if err != nil {
+			t.Fatalf("send file failed: %s", err)
+		}
+		if url == "" {
+			t.Fatal("upload file returned empty url")
+		}
+	})
+
+	t.Run("Delete file", func(t *testing.T) {
+		err := ch.DeleteFile(url)
+		if err != nil {
+			t.Fatalf("delete file failed: %s", err.Error())
+		}
+	})
+}
+
+func TestChannel_SendImage(t *testing.T) {
+	c := initClient(t)
+	ch := initChannel(t, c)
+
+	var url string
+
+	t.Run("Send image", func(t *testing.T) {
+		file, err := os.Open(path.Join("testdata", "helloworld.jpg"))
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		url, err = ch.SendImage(SendFileRequest{
+			Reader:      file,
+			FileName:    "HelloWorld.jpg",
+			User:        randomUser(),
+			ContentType: "image/jpeg",
+		})
+
+		if err != nil {
+			t.Fatalf("Send image failed: %s", err.Error())
+		}
+
+		if url == "" {
+			t.Fatal("upload image returned empty url")
+		}
+	})
+
+	t.Run("Delete image", func(t *testing.T) {
+		err := ch.DeleteImage(url)
+		if err != nil {
+			t.Fatalf("delete image failed: %s", err.Error())
+		}
+	})
+}

client.go

@@ -7,9 +7,14 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"io/ioutil"
+	"mime/multipart"
 	"net/http"
+	"net/textproto"
 	"net/url"
+	"os"
+	"strings"
 	"time"
 
 	"github.com/getstream/easyjson"
@@ -72,31 +77,52 @@ func (c *Client) requestURL(path string, values url.Values) (string, error) {
 	return _url.String(), nil
 }
 
-func (c *Client) makeRequest(method, path string,
-	params url.Values, data interface{}, result easyjson.Unmarshaler) error {
+func (c *Client) newRequest(method, path string, params url.Values, data interface{}) (*http.Request, error) {
 	_url, err := c.requestURL(path, params)
 	if err != nil {
-		return err
+		return nil, err
 	}
 
-	var body []byte
-	if m, ok := data.(easyjson.Marshaler); ok {
-		body, err = easyjson.Marshal(m)
-	} else {
-		body, err = json.Marshal(data)
+	r, err := http.NewRequest(method, _url, nil)
+	if err != nil {
+		return nil, err
 	}
 
-	if err != nil {
-		return err
+	c.setHeaders(r)
+
+	switch t := data.(type) {
+	case easyjson.Marshaler:
+		b, err := easyjson.Marshal(t)
+		if err != nil {
+			return nil, err
+		}
+		r.Body = ioutil.NopCloser(bytes.NewReader(b))
+
+	case io.ReadCloser:
+		r.Body = t
+
+	case io.Reader:
+		r.Body = ioutil.NopCloser(t)
+
+	default:
+		b, err := json.Marshal(data)
+		if err != nil {
+			return nil, err
+		}
+		r.Body = ioutil.NopCloser(bytes.NewReader(b))
 	}
 
-	r, err := http.NewRequest(method, _url, bytes.NewReader(body))
+	return r, nil
+}
+
+func (c *Client) makeRequest(method, path string, params url.Values,
+	data interface{}, result easyjson.Unmarshaler) error {
+
+	r, err := c.newRequest(method, path, params, data)
 	if err != nil {
 		return err
 	}
 
-	c.setHeaders(r)
-
 	resp, err := c.HTTP.Do(r)
 	if err != nil {
 		return err
@@ -138,6 +164,115 @@ func (c *Client) VerifyWebhook(body []byte, signature []byte) (valid bool) {
 	return hmac.Equal(signature, expectedMAC)
 }
 
+type sendFileResponse struct {
+	File string `json:"file"`
+}
+
+//nolint:gochecknoglobals
+var quoteEscaper = strings.NewReplacer("\\", "\\\\", `"`, "\\\"")
+
+func escapeQuotes(s string) string {
+	return quoteEscaper.Replace(s)
+}
+
+// this adds possible to set content type
+type multipartForm struct {
+	*multipart.Writer
+}
+
+// CreateFormFile is a convenience wrapper around CreatePart. It creates
+// a new form-data header with the provided field name, file name and content type
+func (form *multipartForm) CreateFormFile(fieldName, filename, contentType string) (io.Writer, error) {
+	h := make(textproto.MIMEHeader)
+
+	h.Set("Content-Disposition",
+		fmt.Sprintf(`form-data; name="%s"; filename="%s"`,
+			escapeQuotes(fieldName), escapeQuotes(filename)))
+
+	if contentType == "" {
+		contentType = "application/octet-stream"
+	}
+
+	h.Set("Content-Type", contentType)
+
+	return form.Writer.CreatePart(h)
+}
+
+func (form *multipartForm) setData(fieldName string, data easyjson.Marshaler) error {
+	field, err := form.CreateFormField(fieldName)
+	if err != nil {
+		return err
+	}
+	_, err = easyjson.MarshalToWriter(data, field)
+	return err
+}
+
+func (form *multipartForm) setFile(fieldName string, r io.Reader, fileName, contentType string) error {
+	file, err := form.CreateFormFile(fieldName, fileName, contentType)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(file, r)
+
+	return err
+}
+
+func (c *Client) sendFile(url string, opts SendFileRequest) (string, error) {
+	if opts.User == nil {
+		return "", errors.New("user is nil")
+	}
+
+	tmpfile, err := ioutil.TempFile("", opts.FileName)
+	if err != nil {
+		return "", err
+	}
+
+	defer func() {
+		_ = tmpfile.Close()
+		_ = os.Remove(tmpfile.Name())
+	}()
+
+	form := multipartForm{multipart.NewWriter(tmpfile)}
+
+	if err = form.setData("user", opts.User); err != nil {
+		return "", err
+	}
+
+	err = form.setFile("file", opts.Reader, opts.FileName, opts.ContentType)
+	if err != nil {
+		return "", err
+	}
+
+	err = form.Close()
+	if err != nil {
+		return "", err
+	}
+
+	if _, err = tmpfile.Seek(0, 0); err != nil {
+		return "", err
+	}
+
+	r, err := c.newRequest(http.MethodPost, url, nil, tmpfile)
+	if err != nil {
+		return "", err
+	}
+
+	r.Header.Set("Content-Type", form.FormDataContentType())
+
+	res, err := c.HTTP.Do(r)
+	if err != nil {
+		return "", err
+	}
+
+	var resp sendFileResponse
+	err = c.parseResponse(res, &resp)
+	if err != nil {
+		return "", err
+	}
+
+	return resp.File, err
+}
+
 // NewClient creates new stream chat api client
 func NewClient(apiKey string, apiSecret []byte) (*Client, error) {
 	switch {

stream_chat.go

@@ -86,6 +86,10 @@ type StreamChannel interface {
 	Query(data map[string]interface{}) error
 	Show(userID string) error
 	Hide(userID string) error
+	SendFile(request SendFileRequest) (url string, err error)
+	SendImage(request SendFileRequest) (url string, err error)
+	DeleteFile(location string) error
+	DeleteImage(location string) error
 
 	// event.go
 	SendEvent(event *Event, userID string) error