cn.ipokerface.weixin.request.http.apache.FormBodyPartBuilder Maven / Gradle / Ivy

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package cn.ipokerface.weixin.request.http.apache;

import cn.ipokerface.weixin.request.http.ContentType;

import java.util.List;

/**
 * Created by       PokerFace
 * Create Date      2019-12-27.
 * Email:           [email protected]
 * Version          1.0.0
 * 
 * Description:
 */
public class FormBodyPartBuilder {

    private String name;
    private ContentBody body;
    private final Header header;

    public static FormBodyPartBuilder create(final String name, final ContentBody body) {
        return new FormBodyPartBuilder(name, body);
    }

    public static FormBodyPartBuilder create() {
        return new FormBodyPartBuilder();
    }

    FormBodyPartBuilder(final String name, final ContentBody body) {
        this();
        this.name = name;
        this.body = body;
    }

    FormBodyPartBuilder() {
        this.header = new Header();
    }

    public FormBodyPartBuilder setName(final String name) {
        this.name = name;
        return this;
    }

    public FormBodyPartBuilder setBody(final ContentBody body) {
        this.body = body;
        return this;
    }

    public FormBodyPartBuilder addField(final String name, final String value) {
        this.header.addField(new MinimalField(name, value));
        return this;
    }

    public FormBodyPartBuilder setField(final String name, final String value) {
        this.header.setField(new MinimalField(name, value));
        return this;
    }

    public FormBodyPartBuilder removeFields(final String name) {
        this.header.removeFields(name);
        return this;
    }

    public FormBodyPart build() {
        final Header headerCopy = new Header();
        final List fields = this.header.getFields();
        for (final MinimalField field: fields) {
            headerCopy.addField(field);
        }
        if (headerCopy.getField(Mime.CONTENT_DISPOSITION) == null) {
            final StringBuilder buffer = new StringBuilder();
            buffer.append("form-data; name=\"");
            buffer.append(encodeForHeader(this.name));
            buffer.append("\"");
            if (this.body.getFilename() != null) {
                buffer.append("; filename=\"");
                buffer.append(encodeForHeader(this.body.getFilename()));
                buffer.append("\"");
            }
            headerCopy.addField(new MinimalField(Mime.CONTENT_DISPOSITION, buffer.toString()));
        }
        if (headerCopy.getField(Mime.CONTENT_TYPE) == null) {
            final ContentType contentType;
            if (body instanceof AbstractContentBody) {
                contentType = ((AbstractContentBody) body).getContentType();
            } else {
                contentType = null;
            }
            if (contentType != null) {
                headerCopy.addField(new MinimalField(Mime.CONTENT_TYPE, contentType.toString()));
            } else {
                final StringBuilder buffer = new StringBuilder();
                buffer.append(this.body.getMimeType()); // MimeType cannot be null
                if (this.body.getCharset() != null) { // charset may legitimately be null
                    buffer.append("; charset=");
                    buffer.append(this.body.getCharset());
                }
                headerCopy.addField(new MinimalField(Mime.CONTENT_TYPE, buffer.toString()));
            }
        }
        if (headerCopy.getField(Mime.CONTENT_TRANSFER_ENC) == null) {
            // TE cannot be null
            headerCopy.addField(new MinimalField(Mime.CONTENT_TRANSFER_ENC, body.getTransferEncoding()));
        }
        return new FormBodyPart(this.name, this.body, headerCopy);
    }

    private static String encodeForHeader(final String headerName) {
        if (headerName == null) {
            return null;
        }
        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < headerName.length(); i++) {
            final char x = headerName.charAt(i);
            if (x == '"' || x == '\\' || x == '\r') {
                sb.append("\\");
            }
            sb.append(x);
        }
        return sb.toString();
    }


}