Add a FileUpload Plugin

avaje-jex-file-upload/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>io.avaje</groupId>
+    <artifactId>avaje-jex-parent</artifactId>
+    <version>3.3-RC4</version>
+  </parent>
+  <artifactId>avaje-jex-file-upload</artifactId>
+  <name>avaje-jex-file-upload</name>
+
+  <dependencies>
+    <dependency>
+      <groupId>io.avaje</groupId>
+      <artifactId>avaje-jex</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>io.avaje</groupId>
+      <artifactId>avaje-jex-test</artifactId>
+      <version>${project.version}</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+</project>

avaje-jex-file-upload/src/main/java/io/avaje/jex/file/upload/DFileUploadService.java

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+package io.avaje.jex.file.upload;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import io.avaje.jex.http.Context;
+
+final class DFileUploadService implements FileUploadService {
+
+  private final MultipartConfig multipartConfig;
+  private final Context ctx;
+  private Map<String, List<MultiPart>> uploadedFilesMap;
+
+  DFileUploadService(MultipartConfig multipartConfig, Context ctx) {
+    this.multipartConfig = multipartConfig;
+    this.ctx = ctx;
+  }
+
+  private void ensureParsed() {
+    if (uploadedFilesMap == null) {
+      var contentType = ctx.contentType();
+      if (contentType == null || !contentType.startsWith("multipart/form-data")) {
+        uploadedFilesMap = Map.of();
+        return;
+      }
+      try {
+        uploadedFilesMap = MultipartFormParser.parse(charset(), contentType, ctx, multipartConfig);
+      } catch (IOException e) {
+        throw new UncheckedIOException(e);
+      }
+    }
+  }
+
+  @Override
+  public MultiPart uploadedFile(String fileName) {
+    ensureParsed();
+    var files = uploadedFilesMap.get(fileName);
+    return files != null && !files.isEmpty() ? files.get(0) : null;
+  }
+
+  @Override
+  public List<MultiPart> uploadedFiles(String fileName) {
+    ensureParsed();
+    var files = uploadedFilesMap.get(fileName);
+    return files != null ? files : java.util.Collections.emptyList();
+  }
+
+  @Override
+  public List<MultiPart> uploadedFiles() {
+    ensureParsed();
+    List<MultiPart> all = new ArrayList<>();
+    for (List<MultiPart> parts : uploadedFilesMap.values()) {
+      all.addAll(parts);
+    }
+    return all;
+  }
+
+  @Override
+  public Map<String, List<MultiPart>> uploadedFileMap() {
+    ensureParsed();
+    return uploadedFilesMap;
+  }
+
+  private Charset charset() {
+    return parseCharset(ctx.header("Content-type"));
+  }
+
+  private static Charset parseCharset(String header) {
+    if (header != null) {
+      for (String val : header.split(";")) {
+        val = val.trim();
+        if (val.regionMatches(true, 0, "charset", 0, "charset".length())) {
+          return Charset.forName(val.split("=")[1].trim());
+        }
+      }
+    }
+    return StandardCharsets.ISO_8859_1;
+  }
+}

avaje-jex-file-upload/src/main/java/io/avaje/jex/file/upload/FileUploadPlugin.java

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+package io.avaje.jex.file.upload;
+
+import java.util.function.Consumer;
+
+import io.avaje.jex.Jex;
+import io.avaje.jex.spi.JexPlugin;
+
+/**
+ * A plugin for handling file uploads within the Jex framework.
+ *
+ * <p>This plugin sets up a {@link FileUploadService} accessible via the request context, which
+ * simplifies the process of handling multipart form data.
+ *
+ * @see MultipartConfig
+ * @see FileUploadService
+ */
+public final class FileUploadPlugin implements JexPlugin {
+
+  private final MultipartConfig multipartConfig;
+
+  private FileUploadPlugin(MultipartConfig multipartConfig) {
+    this.multipartConfig = multipartConfig;
+    multipartConfig.cacheDirectory().toFile().mkdirs();
+  }
+
+  /**
+   * Creates and configures a new FileUploadPlugin using a consumer.
+   *
+   * @param consumer A consumer to configure the {@link MultipartConfig}.
+   * @return A new FileUploadPlugin instance.
+   */
+  public static FileUploadPlugin create(Consumer<MultipartConfig> consumer) {
+    var config = new MultipartConfig();
+    consumer.accept(config);
+    return new FileUploadPlugin(config);
+  }
+
+  /**
+   * Creates a new FileUploadPlugin with default settings.
+   *
+   * @return A new FileUploadPlugin instance with default configuration.
+   */
+  public static FileUploadPlugin create() {
+    return new FileUploadPlugin(new MultipartConfig());
+  }
+
+  /**
+   * Applies the plugin to the Jex instance.
+   *
+   * <p>This method registers a 'before' handler that creates and adds a {@link FileUploadService}
+   * instance to the request attributes for each incoming request.
+   *
+   * @param jex The Jex instance to which the plugin is being applied.
+   */
+  @Override
+  public void apply(Jex jex) {
+    jex.before(
+        ctx ->
+            ctx.attribute(FileUploadService.class, new DFileUploadService(multipartConfig, ctx)));
+  }
+}

avaje-jex-file-upload/src/main/java/io/avaje/jex/file/upload/FileUploadService.java

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+package io.avaje.jex.file.upload;
+
+import java.util.List;
+import java.util.Map;
+
+/** Provides methods for accessing uploaded files from a multipart HTTP request. */
+public interface FileUploadService {
+
+  /**
+   * Retrieves the first uploaded file with the specified form field name.
+   *
+   * <p>This is useful for form fields that are expected to contain a single file.
+   *
+   * @param fileName The name of the form field associated with the uploaded file.
+   * @return The {@link MultiPart} object representing the first file, or {@code null} if no file
+   *     with that name is found.
+   */
+  MultiPart uploadedFile(String fileName);
+
+  /**
+   * Retrieves a list of all uploaded files with the specified form field name.
+   *
+   * @param fileName The name of the form field associated with the uploaded files.
+   * @return A {@link List} of {@link MultiPart} objects, or an empty list if no files with that
+   *     name are found.
+   */
+  List<MultiPart> uploadedFiles(String fileName);
+
+  /**
+   * Retrieves a list of all uploaded files from the request, regardless of their form field name.
+   *
+   * @return A {@link List} of all {@link MultiPart} objects that are files, or an empty list if no
+   *     files were uploaded.
+   */
+  List<MultiPart> uploadedFiles();
+
+  /**
+   * Retrieves a map of all uploaded files, grouped by their form field name.
+   *
+   * <p>The map's key is the name of the form field, and the value is a list of {@link MultiPart}
+   * objects uploaded under that field name. If the request is not a multipart request, this method
+   * will return an empty map.
+   *
+   * @return A {@link Map} where keys are form field names and values are lists of {@link MultiPart}
+   *     files. Returns an empty map for non-multipart requests.
+   */
+  Map<String, List<MultiPart>> uploadedFileMap();
+}

avaje-jex-file-upload/src/main/java/io/avaje/jex/file/upload/MultiPart.java

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+package io.avaje.jex.file.upload;
+
+import java.io.File;
+import java.nio.file.Files;
+
+/**
+ * A multipart part. Closing deletes the uploaded file
+ *
+ * <p>either data or file will be non-null, but not both.
+ *
+ * @param contentType the content type of the data
+ * @param filename the form provided filename
+ * @param file points to the uploaded file data (the name may differ from filename). This file is
+ *     marked as delete on exit.
+ * @param data if contains the part data as a String.
+ */
+public record MultiPart(String contentType, String filename, String data, File file)
+    implements AutoCloseable {
+
+  /** Delete the file */
+  @Override
+  public void close() throws Exception {
+    if (file != null) {
+      Files.delete(file.toPath());
+    }
+  }
+}

avaje-jex-file-upload/src/main/java/io/avaje/jex/file/upload/MultipartConfig.java

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+package io.avaje.jex.file.upload;
+
+import java.nio.file.Path;
+
+/**
+ * Configuration settings for handling multipart file uploads.
+ *
+ * <p>This class allows you to customize various aspects of file upload behavior, such as file size
+ * limits and the location where temporary files are stored.
+ */
+public final class MultipartConfig {
+
+  private String cacheDirectory = System.getProperty("java.io.tmpdir");
+  private long maxFileSize = -1;
+  private long maxRequestSize = -1;
+  private int maxInMemoryFileSize = 1;
+
+  MultipartConfig() {}
+
+  /**
+   * Sets the directory where uploaded files exceeding the in-memory size limit will be cached.
+   *
+   * <p>If not set, the java's default temporary directory will be used.
+   *
+   * @param path The absolute path to the cache directory.
+   * @see #maxInMemoryFileSize(int, FileSize)
+   */
+  public MultipartConfig cacheDirectory(String path) {
+    this.cacheDirectory = path;
+    return this;
+  }
+
+  /**
+   * Sets the maximum allowed size for a single uploaded file.
+   *
+   * <p>A value of -1 indicates no limit.
+   *
+   * @param size The maximum size of the file.
+   * @param sizeUnit The unit of measurement for the size (e.g., KB, MB, GB).
+   */
+  public MultipartConfig maxFileSize(long size, FileSize sizeUnit) {
+    this.maxFileSize = size * sizeUnit.multiplier();
+    return this;
+  }
+
+  /**
+   * Sets the maximum size a file can be before it is written to disk.
+   *
+   * <p>A value of -1 indicates no limit.
+   *
+   * <p>Files smaller than this size will be kept in memory, which can be faster for small uploads
+   * but consumes more memory. Files larger than this size will be written to the {@link
+   * #cacheDirectory(String)}. A value of 0 means all files are written to disk.
+   *
+   * @param size The maximum in-memory size of the file.
+   * @param sizeUnit The unit of measurement for the size (e.g., KB, MB).
+   */
+  public MultipartConfig maxInMemoryFileSize(int size, FileSize sizeUnit) {
+    this.maxInMemoryFileSize = size * sizeUnit.multiplier();
+    return this;
+  }
+
+  /**
+   * Sets the maximum total size for a multipart request, including all files and form data.
+   *
+   * <p>A value of -1 indicates no limit.
+   *
+   * @param size The maximum size of the entire request.
+   * @param sizeUnit The unit of measurement for the size (e.g., KB, MB, GB).
+   */
+  public MultipartConfig maxRequestSize(long size, FileSize sizeUnit) {
+    this.maxRequestSize = size * sizeUnit.multiplier();
+    return this;
+  }
+
+  /** Represents standard file size units for use in configuration. */
+  public enum FileSize {
+    BYTES(1),
+    KB(1024),
+    MB(1024 * 1024),
+    GB(1024 * 1024 * 1024);
+
+    private final int multiplier;
+
+    FileSize(int multiplier) {
+      this.multiplier = multiplier;
+    }
+
+    int multiplier() {
+      return multiplier;
+    }
+  }
+
+  Path cacheDirectory() {
+    return Path.of(cacheDirectory);
+  }
+
+  long maxFileSize() {
+    return maxFileSize;
+  }
+
+  long maxRequestSize() {
+    return maxRequestSize;
+  }
+
+  int maxInMemoryFileSize() {
+    return maxInMemoryFileSize;
+  }
+}