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/*
 * Copyright (C) 2014 Square, Inc.
 *
 * 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 com.facebook.presto.jdbc.internal.okhttp3;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import com.facebook.presto.jdbc.internal.javax.annotation.Nullable;
import com.facebook.presto.jdbc.internal.okhttp3.internal.Util;
import com.facebook.presto.jdbc.internal.okio.Buffer;
import com.facebook.presto.jdbc.internal.okio.BufferedSink;
import com.facebook.presto.jdbc.internal.okio.ByteString;

/** An RFC 2387-compliant request body. */
public final class MultipartBody extends RequestBody {
  /**
   * The "mixed" subtype of "multipart" is intended for use when the body parts are independent and
   * need to be bundled in a particular order. Any "multipart" subtypes that an implementation does
   * not recognize must be treated as being of subtype "mixed".
   */
  public static final MediaType MIXED = MediaType.parse("multipart/mixed");

  /**
   * The "multipart/alternative" type is syntactically identical to "multipart/mixed", but the
   * semantics are different. In particular, each of the body parts is an "alternative" version of
   * the same information.
   */
  public static final MediaType ALTERNATIVE = MediaType.parse("multipart/alternative");

  /**
   * This type is syntactically identical to "multipart/mixed", but the semantics are different. In
   * particular, in a digest, the default {@code Content-Type} value for a body part is changed from
   * "text/plain" to "message/rfc822".
   */
  public static final MediaType DIGEST = MediaType.parse("multipart/digest");

  /**
   * This type is syntactically identical to "multipart/mixed", but the semantics are different. In
   * particular, in a parallel entity, the order of body parts is not significant.
   */
  public static final MediaType PARALLEL = MediaType.parse("multipart/parallel");

  /**
   * The media-type multipart/form-data follows the rules of all multipart MIME data streams as
   * outlined in RFC 2046. In forms, there are a series of fields to be supplied by the user who
   * fills out the form. Each field has a name. Within a given form, the names are unique.
   */
  public static final MediaType FORM = MediaType.parse("multipart/form-data");

  private static final byte[] COLONSPACE = {':', ' '};
  private static final byte[] CRLF = {'\r', '\n'};
  private static final byte[] DASHDASH = {'-', '-'};

  private final ByteString boundary;
  private final MediaType originalType;
  private final MediaType contentType;
  private final List parts;
  private long contentLength = -1L;

  MultipartBody(ByteString boundary, MediaType type, List parts) {
    this.boundary = boundary;
    this.originalType = type;
    this.contentType = MediaType.parse(type + "; boundary=" + boundary.utf8());
    this.parts = Util.immutableList(parts);
  }

  public MediaType type() {
    return originalType;
  }

  public String boundary() {
    return boundary.utf8();
  }

  /** The number of parts in this multipart body. */
  public int size() {
    return parts.size();
  }

  public List parts() {
    return parts;
  }

  public Part part(int index) {
    return parts.get(index);
  }

  /** A combination of {@link #type()} and {@link #boundary()}. */
  @Override public MediaType contentType() {
    return contentType;
  }

  @Override public long contentLength() throws IOException {
    long result = contentLength;
    if (result != -1L) return result;
    return contentLength = writeOrCountBytes(null, true);
  }

  @Override public void writeTo(BufferedSink sink) throws IOException {
    writeOrCountBytes(sink, false);
  }

  /**
   * Either writes this request to {@code sink} or measures its content length. We have one method
   * do double-duty to make sure the counting and content are consistent, particularly when it comes
   * to awkward operations like measuring the encoded length of header strings, or the
   * length-in-digits of an encoded integer.
   */
  private long writeOrCountBytes(
      @Nullable BufferedSink sink, boolean countBytes) throws IOException {
    long byteCount = 0L;

    Buffer byteCountBuffer = null;
    if (countBytes) {
      sink = byteCountBuffer = new Buffer();
    }

    for (int p = 0, partCount = parts.size(); p < partCount; p++) {
      Part part = parts.get(p);
      Headers headers = part.headers;
      RequestBody body = part.body;

      sink.write(DASHDASH);
      sink.write(boundary);
      sink.write(CRLF);

      if (headers != null) {
        for (int h = 0, headerCount = headers.size(); h < headerCount; h++) {
          sink.writeUtf8(headers.name(h))
              .write(COLONSPACE)
              .writeUtf8(headers.value(h))
              .write(CRLF);
        }
      }

      MediaType contentType = body.contentType();
      if (contentType != null) {
        sink.writeUtf8("Content-Type: ")
            .writeUtf8(contentType.toString())
            .write(CRLF);
      }

      long contentLength = body.contentLength();
      if (contentLength != -1) {
        sink.writeUtf8("Content-Length: ")
            .writeDecimalLong(contentLength)
            .write(CRLF);
      } else if (countBytes) {
        // We can't measure the body's size without the sizes of its components.
        byteCountBuffer.clear();
        return -1L;
      }

      sink.write(CRLF);

      if (countBytes) {
        byteCount += contentLength;
      } else {
        body.writeTo(sink);
      }

      sink.write(CRLF);
    }

    sink.write(DASHDASH);
    sink.write(boundary);
    sink.write(DASHDASH);
    sink.write(CRLF);

    if (countBytes) {
      byteCount += byteCountBuffer.size();
      byteCountBuffer.clear();
    }

    return byteCount;
  }

  /**
   * Appends a quoted-string to a StringBuilder.
   *
   * 

RFC 2388 is rather vague about how one should escape special characters in form-data * parameters, and as it turns out Firefox and Chrome actually do rather different things, and * both say in their comments that they're not really sure what the right approach is. We go with * Chrome's behavior (which also experimentally seems to match what IE does), but if you actually * want to have a good chance of things working, please avoid double-quotes, newlines, percent * signs, and the like in your field names. */ static StringBuilder appendQuotedString(StringBuilder target, String key) { target.append('"'); for (int i = 0, len = key.length(); i < len; i++) { char ch = key.charAt(i); switch (ch) { case '\n': target.append("%0A"); break; case '\r': target.append("%0D"); break; case '"': target.append("%22"); break; default: target.append(ch); break; } } target.append('"'); return target; } public static final class Part { public static Part create(RequestBody body) { return create(null, body); } public static Part create(@Nullable Headers headers, RequestBody body) { if (body == null) { throw new NullPointerException("body == null"); } if (headers != null && headers.get("Content-Type") != null) { throw new IllegalArgumentException("Unexpected header: Content-Type"); } if (headers != null && headers.get("Content-Length") != null) { throw new IllegalArgumentException("Unexpected header: Content-Length"); } return new Part(headers, body); } public static Part createFormData(String name, String value) { return createFormData(name, null, RequestBody.create(null, value)); } public static Part createFormData(String name, @Nullable String filename, RequestBody body) { if (name == null) { throw new NullPointerException("name == null"); } StringBuilder disposition = new StringBuilder("form-data; name="); appendQuotedString(disposition, name); if (filename != null) { disposition.append("; filename="); appendQuotedString(disposition, filename); } return create(Headers.of("Content-Disposition", disposition.toString()), body); } final @Nullable Headers headers; final RequestBody body; private Part(@Nullable Headers headers, RequestBody body) { this.headers = headers; this.body = body; } public @Nullable Headers headers() { return headers; } public RequestBody body() { return body; } } public static final class Builder { private final ByteString boundary; private MediaType type = MIXED; private final List parts = new ArrayList<>(); public Builder() { this(UUID.randomUUID().toString()); } public Builder(String boundary) { this.boundary = ByteString.encodeUtf8(boundary); } /** * Set the MIME type. Expected values for {@code type} are {@link #MIXED} (the default), {@link * #ALTERNATIVE}, {@link #DIGEST}, {@link #PARALLEL} and {@link #FORM}. */ public Builder setType(MediaType type) { if (type == null) { throw new NullPointerException("type == null"); } if (!type.type().equals("multipart")) { throw new IllegalArgumentException("multipart != " + type); } this.type = type; return this; } /** Add a part to the body. */ public Builder addPart(RequestBody body) { return addPart(Part.create(body)); } /** Add a part to the body. */ public Builder addPart(@Nullable Headers headers, RequestBody body) { return addPart(Part.create(headers, body)); } /** Add a form data part to the body. */ public Builder addFormDataPart(String name, String value) { return addPart(Part.createFormData(name, value)); } /** Add a form data part to the body. */ public Builder addFormDataPart(String name, @Nullable String filename, RequestBody body) { return addPart(Part.createFormData(name, filename, body)); } /** Add a part to the body. */ public Builder addPart(Part part) { if (part == null) throw new NullPointerException("part == null"); parts.add(part); return this; } /** Assemble the specified parts into a request body. */ public MultipartBody build() { if (parts.isEmpty()) { throw new IllegalStateException("Multipart body must have at least one part."); } return new MultipartBody(boundary, type, parts); } } }





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