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- package telegram
- import (
- "context"
- "fmt"
- "io"
- "net/http"
- "strings"
- )
- // downloadFileId download file with fileID, return the filepath and blob.
- func (b *Bot) downloadFileID(ctx context.Context, fileID string) (string, []byte, error) {
- file, err := b.GetFile(ctx, fileID)
- if err != nil {
- return "", nil, err
- }
- blob, err := b.downloadFilepath(ctx, file.FilePath)
- if err != nil {
- return "", nil, err
- }
- return file.FilePath, blob, nil
- }
- // downloadFilepath download file with filepath, you can get filepath by calling GetFile.
- func (b *Bot) downloadFilepath(ctx context.Context, filePath string) ([]byte, error) {
- apiURL, err := b.apiURL(ctx)
- if err != nil {
- return nil, err
- }
- idx := strings.LastIndex(apiURL, "/bot")
- if idx < 0 {
- return nil, ErrInvalidToken
- }
- fileURL := apiURL[:idx] + "/file" + apiURL[idx:]
- resp, err := http.Get(fileURL + "/" + filePath)
- if err != nil {
- return nil, fmt.Errorf("fail to http.Get: %s", err)
- }
- defer resp.Body.Close()
- body, err := io.ReadAll(resp.Body)
- if err != nil {
- return nil, fmt.Errorf("fail to io.ReadAll: %s", err)
- }
- return body, nil
- }
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