NettyHttpFactories.java

/*
 * Copyright (c) 2013-2015 the original author or authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.werval.server.netty;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;

import io.werval.api.exceptions.WervalException;
import io.werval.api.http.FormUploads.Upload;
import io.werval.api.http.Headers;
import io.werval.api.http.ProtocolVersion;
import io.werval.api.http.Request;
import io.werval.spi.http.HttpBuildersSPI;
import io.werval.spi.http.HttpBuildersSPI.RequestBuilder;
import io.werval.runtime.http.FormUploadsInstance.UploadInstance;

import io.netty.channel.Channel;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.multipart.Attribute;
import io.netty.handler.codec.http.multipart.FileUpload;
import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder;
import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.ErrorDataDecoderException;
import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.IncompatibleDataDecoderException;
import io.netty.handler.codec.http.multipart.HttpPostRequestDecoder.NotEnoughDataDecoderException;
import io.netty.handler.codec.http.multipart.InterfaceHttpData;

import static io.werval.api.http.Headers.Names.CONTENT_TYPE;
import static io.werval.util.IllegalArguments.ensureNotEmpty;
import static io.werval.util.IllegalArguments.ensureNotNull;

import static io.netty.handler.codec.http.HttpHeaders.Values.APPLICATION_X_WWW_FORM_URLENCODED;
import static io.netty.handler.codec.http.HttpHeaders.Values.MULTIPART_FORM_DATA;
import static io.netty.handler.codec.http.HttpMethod.PATCH;
import static io.netty.handler.codec.http.HttpMethod.POST;
import static io.netty.handler.codec.http.HttpMethod.PUT;

/**
 * Factory methods used by the server.
 */
/* package */ final class NettyHttpFactories
{
    /* package */ static String remoteAddressOf( Channel channel )
    {
        SocketAddress remoteAddress = channel.remoteAddress();
        if( remoteAddress == null || !( remoteAddress instanceof InetSocketAddress ) )
        {
            return null;
        }
        InetAddress inetRemoteAddress = ( (InetSocketAddress) remoteAddress ).getAddress();
        if( inetRemoteAddress == null )
        {
            return null;
        }
        return inetRemoteAddress.getHostAddress();
    }

    /* package */ static Request requestOf(
        Charset defaultCharset,
        HttpBuildersSPI builders,
        String remoteSocketAddress, String identity,
        FullHttpRequest request
    )
        throws HttpRequestParsingException
    {
        ensureNotEmpty( "Request Identity", identity );
        ensureNotNull( "Netty FullHttpRequest", request );

        try
        {
            RequestBuilder builder = builders.newRequestBuilder()
                .identifiedBy( identity )
                .remoteSocketAddress( remoteSocketAddress )
                .version( ProtocolVersion.valueOf( request.getProtocolVersion().text() ) )
                .method( request.getMethod().name() )
                .uri( request.getUri() )
                .headers( headersToMap( request.headers() ) );

            if( request.content().readableBytes() > 0
                && ( POST.equals( request.getMethod() )
                     || PUT.equals( request.getMethod() )
                     || PATCH.equals( request.getMethod() ) ) )
            {
                Optional<String> contentType = Headers.extractContentMimeType( request.headers().get( CONTENT_TYPE ) );
                if( contentType.isPresent() )
                {
                    switch( contentType.get() )
                    {
                        case APPLICATION_X_WWW_FORM_URLENCODED:
                        case MULTIPART_FORM_DATA:
                            try
                            {
                                Map<String, List<String>> attributes = new LinkedHashMap<>();
                                Map<String, List<Upload>> uploads = new LinkedHashMap<>();
                                HttpPostRequestDecoder postDecoder = new HttpPostRequestDecoder( request );
                                for( InterfaceHttpData data : postDecoder.getBodyHttpDatas() )
                                {
                                    switch( data.getHttpDataType() )
                                    {
                                        case Attribute:
                                            Attribute attribute = (Attribute) data;
                                            if( !attributes.containsKey( attribute.getName() ) )
                                            {
                                                attributes.put( attribute.getName(), new ArrayList<>() );
                                            }
                                            attributes.get( attribute.getName() ).add( attribute.getValue() );
                                            break;
                                        case FileUpload:
                                            FileUpload fileUpload = (FileUpload) data;
                                            if( !uploads.containsKey( fileUpload.getName() ) )
                                            {
                                                uploads.put( fileUpload.getName(), new ArrayList<>() );
                                            }
                                            Upload upload;
                                            if( fileUpload.isInMemory() )
                                            {
                                                upload = new UploadInstance(
                                                    fileUpload.getContentType(),
                                                    fileUpload.getCharset(),
                                                    fileUpload.getFilename(),
                                                    new ByteBufByteSource( fileUpload.getByteBuf() ).asBytes(),
                                                    defaultCharset
                                                );
                                            }
                                            else
                                            {
                                                upload = new UploadInstance(
                                                    fileUpload.getContentType(),
                                                    fileUpload.getCharset(),
                                                    fileUpload.getFilename(),
                                                    fileUpload.getFile(),
                                                    defaultCharset
                                                );
                                            }
                                            uploads.get( fileUpload.getName() ).add( upload );
                                            break;
                                        default:
                                            break;
                                    }
                                }
                                builder = builder.bodyForm( attributes, uploads );
                                break;
                            }
                            catch( ErrorDataDecoderException | IncompatibleDataDecoderException |
                                   NotEnoughDataDecoderException | IOException ex )
                            {
                                throw new WervalException( "Form or multipart parsing error", ex );
                            }
                        default:
                            builder = builder.bodyBytes( new ByteBufByteSource( request.content() ) );
                            break;
                    }
                }
                else
                {
                    builder = builder.bodyBytes( new ByteBufByteSource( request.content() ) );
                }
            }
            return builder.build();
        }
        catch( Exception ex )
        {
            throw new HttpRequestParsingException( ex );
        }
    }

    private static Map<String, List<String>> headersToMap( HttpHeaders nettyHeaders )
    {
        Map<String, List<String>> headers = new HashMap<>();
        for( String name : nettyHeaders.names() )
        {
            if( !headers.containsKey( name ) )
            {
                headers.put( name, new ArrayList<>() );
            }
            for( String value : nettyHeaders.getAll( name ) )
            {
                headers.get( name ).add( value );
            }
        }
        return headers;
    }

    private NettyHttpFactories()
    {
    }
}