fix: connect premium merchants and restrict approval PDFs

shinnosuke

2026-08-20 40dd0e9898bf2a88e51d497c46d826ea8f7326f4

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package com.talentcard.server.upload;
 
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.util.Locale;
import java.util.UUID;
 
import com.talentcard.server.common.BusinessException;
import com.talentcard.server.common.ErrorCode;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
 
@Service
public class ImageUploadService {
 
    private static final long MAX_IMAGE_SIZE = 10L * 1024 * 1024;
    private static final long MAX_PDF_SIZE = 20L * 1024 * 1024;
 
    private final Path uploadDirectory;
 
    @Autowired
    public ImageUploadService(@Value("${app.upload.directory:uploads}") String uploadDirectory) {
        this(Path.of(uploadDirectory));
    }
 
    ImageUploadService(Path uploadDirectory) {
        this.uploadDirectory = uploadDirectory.toAbsolutePath().normalize();
    }
 
    public ImageUploadResult upload(MultipartFile file) {
        if (file == null || file.isEmpty()) {
            throw new BusinessException(ErrorCode.BAD_REQUEST, "Please select an image");
        }
        if (file.getSize() > MAX_IMAGE_SIZE) {
            throw new BusinessException(ErrorCode.BAD_REQUEST, "Image size cannot exceed 10 MB");
        }
 
        String extension = detectImageExtension(file);
        String filename = UUID.randomUUID() + "." + extension;
        try {
            Files.createDirectories(uploadDirectory);
            Path destination = uploadDirectory.resolve(filename).normalize();
            if (!destination.startsWith(uploadDirectory)) {
                throw new BusinessException(ErrorCode.BAD_REQUEST, "Invalid image filename");
            }
            try (InputStream input = file.getInputStream()) {
                Files.copy(input, destination, StandardCopyOption.REPLACE_EXISTING);
            }
        } catch (IOException exception) {
            throw new BusinessException(ErrorCode.INTERNAL_ERROR, "Failed to save image");
        }
        return new ImageUploadResult("/uploads/" + filename);
    }
 
    public ImageUploadResult uploadPdf(MultipartFile file) {
        if (file == null || file.isEmpty()) {
            throw new BusinessException(ErrorCode.BAD_REQUEST, "请选择 PDF 文件");
        }
        if (file.getSize() > MAX_PDF_SIZE) {
            throw new BusinessException(ErrorCode.BAD_REQUEST, "PDF 文件大小不能超过 20 MB");
        }
        try (InputStream input = file.getInputStream()) {
            byte[] header = input.readNBytes(5);
            if (header.length < 5 || header[0] != '%' || header[1] != 'P' || header[2] != 'D' || header[3] != 'F' || header[4] != '-') {
                throw new BusinessException(ErrorCode.BAD_REQUEST, "仅支持 PDF 文件");
            }
        } catch (IOException exception) {
            throw new BusinessException(ErrorCode.BAD_REQUEST, "无法读取 PDF 文件");
        }
        String contentType = file.getContentType() == null ? "" : file.getContentType().toLowerCase(Locale.ROOT);
        if (!contentType.isBlank() && !"application/pdf".equals(contentType) && !"application/octet-stream".equals(contentType)) {
            throw new BusinessException(ErrorCode.BAD_REQUEST, "仅支持 PDF 文件");
        }
        String filename = UUID.randomUUID() + ".pdf";
        try {
            Files.createDirectories(uploadDirectory);
            Path destination = uploadDirectory.resolve(filename).normalize();
            if (!destination.startsWith(uploadDirectory)) throw new BusinessException(ErrorCode.BAD_REQUEST, "Invalid PDF filename");
            Files.copy(file.getInputStream(), destination, StandardCopyOption.REPLACE_EXISTING);
        } catch (IOException exception) {
            throw new BusinessException(ErrorCode.INTERNAL_ERROR, "保存 PDF 文件失败");
        }
        return new ImageUploadResult("/uploads/" + filename);
    }
 
    private String detectImageExtension(MultipartFile file) {
        byte[] header = new byte[12];
        try (InputStream input = file.getInputStream()) {
            int count = input.readNBytes(header, 0, header.length);
            if (count >= 3 && (header[0] & 0xff) == 0xff && (header[1] & 0xff) == 0xd8 && (header[2] & 0xff) == 0xff) {
                return "jpg";
            }
            if (count >= 8 && header[0] == (byte) 0x89 && header[1] == 0x50 && header[2] == 0x4e
                    && header[3] == 0x47 && header[4] == 0x0d && header[5] == 0x0a && header[6] == 0x1a && header[7] == 0x0a) {
                return "png";
            }
            if (count >= 12 && new String(header, 0, 4).equals("RIFF") && new String(header, 8, 4).equals("WEBP")) {
                return "webp";
            }
        } catch (IOException exception) {
            throw new BusinessException(ErrorCode.BAD_REQUEST, "Unable to read image");
        }
 
        String contentType = file.getContentType();
        String type = contentType == null ? "" : contentType.toLowerCase(Locale.ROOT);
        throw new BusinessException(ErrorCode.BAD_REQUEST,
                "Only JPG, PNG, and WEBP images are supported" + (type.isBlank() ? "" : " (received " + type + ")"));
    }
}