HTTP client from linthumbnail

[vttranlina]

Why

In order to get a thumbnail image from the mail attachment file.
Create an HTTP Client for request to linthumbnail server.

How

The client like RspamdHttpClient

public class ThumbGenerateResponse {
   private byte[] image
}

public interface ThumbnailHttpClient {
    Publisher<ThumbGenerateResponse> get(byte[] attachmentPayload, MimeType mimeType);
}

public class LinshareThumbnailHttpClient implements ThumbnailHttpClient {
    private final HttpClient httpClient;

    public LinshareThumbnailHttpClient(LinshareThumbnailConfigure configure) {
        this.httpClient = ...;
    }

    @Override
    public Publisher<ThumbGenerateResponse> get(byte[] attachmentPayload, MimeType mimeType) {
        // todo
        return null;
    }
}

Bonus

• linthumbnail server docker

docker run -p 8080:8080 --name linshare_thumbnail-server linagora/linshare-thumbnail-server:2.1.1

• Request sample :

curl --location --request POST 'localhost:8080/linthumbnail?mimeType=image/jpeg' \
--form 'file=@"/home/tungtv/Pictures/cmndChanDung.jpg"'

• Response sample:

Content-Type: multipart/mixed;boundary=Boundary_1_1448027541_1678681426294
--Boundary_1_1448027541_1678681426294
Content-Type: text/plain
Content-Disposition: attachement; filename="SMALL.png"

�PNG
��+�n+�_U�_G�<���o)E��Ld�B�����	��C�+�j�D
6ky�ǖ ����t~O^eԣ�ь��
�������d�8x�4����IEND�B`�
--Boundary_1_1448027541_1678681426294
Content-Type: text/plain
Content-Disposition: attachement; filename="LARGE.png"

�PNG
�
���
IHDR�����7�׫�GY[��o+�����w6��`
--Boundary_1_1448027541_1678681426294
Content-Type: text/plain
Content-Disposition: attachement; filename="MEDIUM.png"

�PNG
�
���
IHDR�������X������
--Boundary_1_1448027541_1678681426294--

[quantranhong1999]

So default (without specifying size query param), the linshare thumbnail server return all 3 sizes?

BTW can we try to see the size and quality of the 3 sizes?
rf: #593 (comment)

[chibenwa]

OutputStream is not a reactive type.

We should have a type the represent the actual structure.

[chibenwa]

Time that it takes to generate the thumbnail?

[vttranlina]

Time that it takes to generate the thumbnail?

Generate thumbnail is a synch request, time depends on the size of the payload, network, and workload of the thumbnail server
On my local PC, the odt file has a size 3.2MB, it takes time = 1341 ms

[chibenwa]

On my local PC, the odt file has a size 3.2MB, it takes time = 1341 ms

:-(

... Let's make a cache for this then!

Key: SHA-256(byte stream of the attachment)
Value: byte stream of the attachment

Technology to implement the cache: caffeine

[chibenwa]

ThumbGenerateResponse => ThumbnailGenerationResponse

[chibenwa]

ThumbnailHttpClient => ThumbnailGenerator