Teams Bot FileInfoCard Sharepoint 内容 URL 错误

Question

我正在按照这个 Teams 文件上传 Bot 示例构建一个 Teams Bot。

我正在尝试获取 PDF 文件，并让它通过 FileConsentCard 和 FileInfoCard 进行响应：

单击提供的内容 URL 链接时，出现以下错误，无法查看文件或下载。

我使用的代码与文件上传机器人示例相同，只是我将文件类型更改为我的网络服务器上的 PDF 文档。

关于为什么链接无效的任何想法？可能有一些权限？

private CompletableFuture<Void> sendFileCard(
        TurnContext turnContext, String filename, long filesize
    ) { 
        
        Map<String, String> consentContext = new HashMap<>();
        consentContext.put("filename", filename);

        FileConsentCard fileCard = new FileConsentCard();
        fileCard.setDescription("This is the file I want to send you");
        fileCard.setSizeInBytes(filesize);
        fileCard.setAcceptContext(consentContext);
        fileCard.setDeclineContext(consentContext);

        Attachment asAttachment = new Attachment();
        asAttachment.setContent(fileCard);
        asAttachment.setContentType(FileConsentCard.CONTENT_TYPE);
        asAttachment.setName(filename);     

        Activity reply = turnContext.getActivity().createReply();
        reply.setAttachments(Collections.singletonList(asAttachment));

        return turnContext.sendActivityBlind(reply);
    }

private CompletableFuture<ResultPair<String>> upload(
        FileConsentCardResponse fileConsentCardResponse
    ) {
        AtomicReference<ResultPair<String>> result = new AtomicReference<>();       
        
        return CompletableFuture.runAsync(() -> {
            Map<String, String> context = (Map<String, String>) fileConsentCardResponse
                .getContext();
            File filePath = new File("files", context.get("filename"));
            HttpURLConnection connection = null;

            try {               
                
                URL url = new URL(fileConsentCardResponse.getUploadInfo().getUploadUrl());
                connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("PUT");
                connection.setDoOutput(true);
                connection.setRequestProperty("Content-Length", Long.toString(filePath.length()));
                connection.setRequestProperty(
                    "Content-Range",
                    String.format("bytes 0-%d/%d", filePath.length() - 1, filePath.length())
                );              

                try (
                    FileInputStream fileStream = new FileInputStream(filePath);
                    OutputStream uploadStream = connection.getOutputStream()
                ) {
                    byte[] buffer = new byte[4096];
                    int bytes_read;
                    while ((bytes_read = fileStream.read(buffer)) != -1) {                      
                        uploadStream.write(buffer, 0, bytes_read);
                    }                   
                }

                result.set(new ResultPair<String>(true, null));
            } catch (Throwable t) {             
                result.set(new ResultPair<String>(false, t.getLocalizedMessage()));
            } finally {                 
                if (connection != null) {
                    connection.disconnect();
                }
            }
        })
            .thenApply(aVoid -> result.get());
    }

private CompletableFuture<Void> fileUploadCompleted(
        TurnContext turnContext, FileConsentCardResponse fileConsentCardResponse
    ) {
        FileInfoCard downloadCard = new FileInfoCard();
        downloadCard.setUniqueId(fileConsentCardResponse.getUploadInfo().getUniqueId());
        downloadCard.setFileType(fileConsentCardResponse.getUploadInfo().getFileType());

        Attachment asAttachment = new Attachment();
        asAttachment.setContent(downloadCard);
        asAttachment.setContentType(FileInfoCard.CONTENT_TYPE);
        asAttachment.setName(fileConsentCardResponse.getUploadInfo().getName());        
        
        asAttachment.setContentUrl(fileConsentCardResponse.getUploadInfo().getContentUrl());

        Activity reply = MessageFactory.text(
            String.format(
                "<b>File uploaded.</b> Your file <b>%s</b> is ready to download",
                fileConsentCardResponse.getUploadInfo().getName()
            )
        );
        reply.setTextFormat(TextFormatTypes.XML);
        reply.setAttachment(asAttachment);

        return turnContext.sendActivityBlind(reply);
    }