fix test, readme and example

Author: fregin

README.md

@@ -321,6 +321,47 @@ bot.SendMediaGroup(ctx, params)
 
 [Demo in examples](examples/send_media_group/main.go)
 
+## InputSticker
+
+For `CreateNewStickerSet` method you can send sticker by file path or file contents.
+
+[Official documentation InputSticker]((https://core.telegram.org/bots/api#inputsticker)
+
+> field `sticker`: The added sticker. Pass a file_id as a String to send a file that already exists on the Telegram servers, pass an HTTP URL as a String for Telegram to get a file from the Internet, or pass “attach://<file_attach_name>” to upload a new file using multipart/form-data under <file_attach_name> name. Animated and video stickers can't be uploaded via HTTP URL.
+
+If you want to use `attach://` format, you should to define `StickerAttachment` field with file content reader.
+
+```go
+fileContent, _ := os.ReadFile("/path/to/telegram.png")
+
+inputSticker1 := models.InputSticker{
+	Sticker:   "https://github.com/go-telegram/bot/blob/main/examples/create_new_sticker_set/images/telegram.png?raw=true",
+	Format:    "static",
+	EmojiList: []string{"1️⃣"},
+}
+
+inputSticker2 := models.InputSticker{
+	Sticker:           "attach://telegram.png",
+	Format:            "static",
+	EmojiList:         []string{"2️⃣"},
+	StickerAttachment: bytes.NewReader(fileContent),
+}
+
+params := &bot.CreateNewStickerSetParams{
+	UserID: update.Message.Chat.ID,
+	Name:   fmt.Sprintf("Example%d_by_%s", time.Now().Unix(), botUsername),
+	Title:  "Example sticker set",
+	Stickers: []models.InputSticker{
+		inputSticker1,
+		inputSticker2,
+	},
+}
+
+b.CreateNewStickerSet(ctx, params)
+```
+
+[Demo in examples](examples/create_new_sticker_set/main.go)
+
 ## Helpers
 
 ### `EscapeMarkdown(s string) string`

build_request_form_test.go

@@ -29,6 +29,7 @@ func Test_buildRequestForm(t *testing.T) {
 		DefaultInt                 int                        `json:"default_int"`
 		InputMediaInterface        models.InputMedia          `json:"input_media_interface"`
 		InlineQueryResultInterface models.InlineQueryResult   `json:"inline_query_result_interface"`
+		InputStickerSlice          []models.InputSticker      `json:"input_sticker_slice"`
 		NoJSONTag1                 string
 		NoJSONTag2                 string `json:"-"`
 		OmitEmptyString            string `json:"omit_empty_string,omitempty"`
@@ -46,9 +47,22 @@ func Test_buildRequestForm(t *testing.T) {
 		DefaultInt:                 42,
 		InputMediaInterface:        &models.InputMediaPhoto{Media: "foo", Caption: "bar", ParseMode: "baz"},
 		InlineQueryResultInterface: &models.InlineQueryResultArticle{Title: "foo", Description: "bar", InputMessageContent: &models.InputTextMessageContent{MessageText: "foo"}},
-		NoJSONTag1:                 "foo",
-		NoJSONTag2:                 "bar",
-		OmitEmptyString:            "",
+		InputStickerSlice: []models.InputSticker{
+			{
+				Sticker:   "attach://sticker.png",
+				Format:    "foo",
+				EmojiList: []string{"bar"},
+				StickerAttachment: strings.NewReader("sticker file"),
+			},
+			{
+				Sticker:   "foo",
+				Format:    "bar",
+				EmojiList: []string{"baz"},
+			},
+		},
+		NoJSONTag1:      "foo",
+		NoJSONTag2:      "bar",
+		OmitEmptyString: "",
 	}
 
 	buf := bytes.NewBuffer(nil)
@@ -102,8 +116,17 @@ Content-Disposition: form-data; name="input_media_interface"
 Content-Disposition: form-data; name="inline_query_result_interface"
 
 {"type":"article","id":"","title":"foo","input_message_content":{"message_text":"foo"},"description":"bar"}
+--XXX
+Content-Disposition: form-data; name="sticker.png"; filename="sticker.png"
+Content-Type: application/octet-stream
+
+sticker file
+--XXX
+Content-Disposition: form-data; name="input_sticker_slice"
+
+[{"sticker":"attach://sticker.png","format":"foo","emoji_list":["bar"]},{"sticker":"foo","format":"bar","emoji_list":["baz"]}]
 --XXX--
 `
-	assertEqualInt(t, fieldsCount, 6)
+	assertEqualInt(t, fieldsCount, 7)
 	assertFormData(t, buf.String(), expect)
 }

examples/create_new_sticker_set/images/telegram.png

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"embed"
+	"fmt"
+	"os"
+	"os/signal"
+	"time"
+
+	"github.com/go-telegram/bot"
+	"github.com/go-telegram/bot/models"
+)
+
+// Send any text message to the bot after the bot has been started
+
+func main() {
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer cancel()
+
+	opts := []bot.Option{
+		bot.WithDefaultHandler(handler),
+		bot.WithSkipGetMe(),
+	}
+
+	b, err := bot.New(os.Getenv("EXAMPLE_TELEGRAM_BOT_TOKEN"), opts...)
+	if nil != err {
+		// panics for the sake of simplicity.
+		// you should handle this error properly in your code.
+		panic(err)
+	}
+
+	user, err := b.GetMe(ctx)
+	if nil != err {
+		// panics for the sake of simplicity.
+		// you should handle this error properly in your code.
+		panic(err)
+	}
+	botUsername = user.Username
+
+	b.Start(ctx)
+}
+
+//go:embed images
+var images embed.FS
+var botUsername string
+
+func handler(ctx context.Context, b *bot.Bot, update *models.Update) {
+	fileContent, _ := images.ReadFile("images/telegram.png")
+
+	inputSticker1 := models.InputSticker{
+		Sticker:   "https://github.com/go-telegram/bot/blob/main/examples/create_new_sticker_set/images/telegram.png?raw=true",
+		Format:    "static",
+		EmojiList: []string{"1️⃣"},
+	}
+
+	inputSticker2 := models.InputSticker{
+		Sticker:           "attach://telegram.png",
+		Format:            "static",
+		EmojiList:         []string{"2️⃣"},
+		StickerAttachment: bytes.NewReader(fileContent),
+	}
+
+	stickerSetName := fmt.Sprintf("Example%d_by_%s", time.Now().Unix(), botUsername)
+	params := &bot.CreateNewStickerSetParams{
+		UserID: update.Message.Chat.ID,
+		Name:   stickerSetName,
+		Title:  "Example sticker set",
+		Stickers: []models.InputSticker{
+			inputSticker1,
+			inputSticker2,
+		},
+	}
+
+	_, err := b.CreateNewStickerSet(ctx, params)
+	if nil != err {
+		// panics for the sake of simplicity.
+		// you should handle this error properly in your code.
+		panic(err)
+	}
+
+	stickerSet, err := b.GetStickerSet(ctx, &bot.GetStickerSetParams{Name: stickerSetName})
+	if err != nil {
+		// panics for the sake of simplicity.
+		// you should handle this error properly in your code.
+		panic(err)
+	}
+	_, err = b.SendSticker(
+		ctx,
+		&bot.SendStickerParams{
+			ChatID: update.Message.Chat.ID,
+			Sticker: &models.InputFileString{
+				Data: stickerSet.Stickers[0].FileID,
+			},
+		},
+	)
+	if err != nil {
+		// panics for the sake of simplicity.
+		// you should handle this error properly in your code.
+		panic(err)
+	}
+}