Question 215495 in Telegram API Question posted in
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Telegram-bot api sendDocument error when i use RestTemplate in Spring boot

I use Spring Boot 3.1, Telegram Bots Spring Boot Starter 6.7.0 and WebHook bot

I need to use class RestTemplate for call method /sendDocument in telegram API. I have read documentation telegram https://core.telegram.org/bots/api#senddocument and https://core.telegram.org/bots/api#sending-files, in my situation i need to send new binary pdf file.

I use next code:

public void sendNewPdfReport(Long chatId) {
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.MULTIPART_FORM_DATA);
    MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();

    File file = null;
    try {
        file = ResourceUtils.getFile("classpath:reports/report.pdf");
    } catch (FileNotFoundException e) {
        throw new RuntimeException(e);
    }
    InputFile inputFile = new InputFile(file);

    body.add("chat_id", chatId);
    body.add("document", inputFile);

    HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);
    restTemplate.postForEntity("https://api.telegram.org/bot<myToken>/sendDocument", requestEntity, String.class);
}

When i call this code i get an error:

API Telegram: 400 Bad Request: "{"ok":false,"error_code":400,"description":"Bad Request: invalid file HTTP URL specified: Unsupported URL protocol"}"

2023-07-23 18:22:58,936 ERROR [http-nio-8088-exec-1] o.a.j.l.DirectJDKLog: Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.NullPointerException: Cannot invoke "org.telegram.telegrambots.meta.api.objects.Message.getChatId()" because the return value of "org.telegram.telegrambots.meta.api.objects.Update.getMessage()" is null] with root cause

I don’t understand what the problem is. I fill in the fields as indicated in the documentation.

I rewrote the code without using RestTemplate:

public void sendNewPdfReport2Work(Long chatId) {
    String uri = "https://api.telegram.org/bot<myToken>/sendDocument";
    HttpPost httppost = new HttpPost(uri);
    InputFile inputFile = new InputFile(new File("report.pdf"));

    MultipartEntityBuilder builder = MultipartEntityBuilder.create();
    builder.addTextBody("chat_id", chatId.toString());
    builder.addBinaryBody(inputFile.getMediaName(), inputFile.getNewMediaFile(),
    ContentType.APPLICATION_OCTET_STREAM, inputFile.getMediaName());
    builder.addTextBody("document", inputFile.getAttachName());
    org.apache.http.HttpEntity multipart = builder.build();

    httppost.setEntity(multipart);
    CloseableHttpClient httpClient = HttpClients.createDefault();
    try {
        httpClient.execute(httppost);
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

AND IT IS WORK! BUT … I need the code to work when using RestTemplate. I conclude that the problem is in the use of RestTemplate.

Help plz, How do I correctly use and configure RestTemplate to send binary files in /sendDocument telegram API

ok, I try with WebClient:

public void sendNewPdfReportWebClient(Long chatId) {
    WebClient webClient = WebClient.create(tgBotConfig.getTelegramApiUrl() + tgBotConfig.getBotToken());

    MultipartBodyBuilder builder = new MultipartBodyBuilder();
    builder.part("chat_id", chatId);
    try {
        builder.part("document", new InputFile(ResourceUtils.getFile("classpath:reports/report.pdf")));
    } catch (FileNotFoundException e) {
        throw new RuntimeException(e);
    }

    webClient.post()
            .uri(String.join("/sendDocument"))
            .contentType(MediaType.MULTIPART_FORM_DATA)
            .body(BodyInserters.fromMultipartData(builder.build()))
            .exchangeToMono(response -> {
                if (response.statusCode().equals(HttpStatus.OK)) {
                    return response.bodyToMono(HttpStatus.class).thenReturn(response.statusCode());
                } else {
                    throw new ServiceException("Error uploading file");
                }
            })
            .block();
}

I have the next error:

Error uploading file
2023-07-24 23:33:55,572 ERROR [http-nio-8088-exec-5] o.a.j.l.DirectJDKLog: Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.NullPointerException: Cannot invoke "org.telegram.telegrambots.meta.api.objects.Message.getText()" because "message" is null] with root cause
java.lang.NullPointerException: Cannot invoke "org.telegram.telegrambots.meta.api.objects.Message.getText()" because "message" is null

Tags:

2

Answers


  1. 0

    Don’t use ResetTemplate with spring boot 3.x. WebClient
    is the recommended for spring boot 3.

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  2. 0

    try with LinkedMultiValueMap like this.

    public void sendNewPdfReportWebClient(Long chatId) {
    WebClient webClient = WebClient.create(tgBotConfig.getTelegramApiUrl() + tgBotConfig.getBotToken());

    //** Create a MultiValueMap to hold the parts of the multipart form data
    MultiValueMap<String, Object> parts = new LinkedMultiValueMap<>();

    parts.add("chat_id", chatId);
    try {
        parts.add("document", new InputFile(ResourceUtils.getFile("classpath:reports/report.pdf")));
    } catch (FileNotFoundException e) {
        throw new RuntimeException(e);
    }

    webClient.post()
            .uri(String.join("/sendDocument"))
            .contentType(MediaType.MULTIPART_FORM_DATA)
            .body(BodyInserters.fromMultipartData(parts))
            .exchangeToMono(response -> {
                if (response.statusCode().equals(HttpStatus.OK)) {
                    return response.bodyToMono(HttpStatus.class).thenReturn(response.statusCode());
                } else {
                    throw new ServiceException("Error uploading file");
                }
            })
            .block();
}
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