dongzhi9574 2018-07-08 17:32
浏览 627

使用POST请求golang上传文件

I'm new to golang and I'm trying to write a function that uploads a file with a post request to telegram for a bot I'm writing.

I've tried with this code but the error I'm getting from telegram is Bad Request: there is no photo in the request.

I've searched on the net for how to do that, but none of what I found helped me through the problem.

func SendPostRequest (url string, filename string) []byte {
    file, err := os.Open(filename)

    if err != nil {
        log.Fatal(err)
    }
    defer file.Close()

    response, err := http.Post(url, "binary/octet-stream", file)

    if err != nil {
        log.Fatal(err)
    }
    defer response.Body.Close()

    content, err := ioutil.ReadAll(response.Body)

    if err != nil {
        log.Fatal(err)
    }

    return content
}

The function I'm calling the SendPostRequest from is

func (e Engine) SendPhoto (filename string, chatId int64) APIResponse {
    var url = fmt.Sprintf("%ssendPhoto?chat_id=%d", e.baseUrl, chatId)

    var content []byte = SendPostRequest(url, filename)
    var response APIResponse

    json.Unmarshal(content, &response)
    return response
}

EDIT: The link to the Telegram bot api I'm using in the code is https://core.telegram.org/bots/api

And the api method is https://core.telegram.org/bots/api#sendphoto

  • 写回答

1条回答 默认 最新

  • duanguan1573 2018-07-21 12:01
    关注

    After some digging I figured it out with this

    func SendPostRequest (url string, filename string, filetype string) []byte {
        file, err := os.Open(filename)
    
        if err != nil {
            log.Fatal(err)
        }
        defer file.Close()
    
    
        body := &bytes.Buffer{}
        writer := multipart.NewWriter(body)
        part, err := writer.CreateFormFile(filetype, filepath.Base(file.Name()))
    
        if err != nil {
            log.Fatal(err)
        }
    
        io.Copy(part, file)
        writer.Close()
        request, err := http.NewRequest("POST", url, body)
    
        if err != nil {
            log.Fatal(err)
        }
    
        request.Header.Add("Content-Type", writer.FormDataContentType())
        client := &http.Client{}
    
        response, err := client.Do(request)
    
        if err != nil {
            log.Fatal(err)
        }
        defer response.Body.Close()
    
        content, err := ioutil.ReadAll(response.Body)
    
        if err != nil {
            log.Fatal(err)
        }
    
        return content
    }
    
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