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bug5992: a first compilable version that embeds JSON in HTML for file uploads

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This commit is contained in:
Axel Uhl
2024-04-16 18:24:11 +02:00
parent aed0b68385
commit b56847e55b
14 changed files with 76 additions and 27 deletions
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java/com.sap.sse.common/src/com/sap/sse/common/fileupload/FileUploadUtil.java
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package com.sap.sse.common.fileupload;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent;
import com.sap.sse.common.Base64Utils;
public class FileUploadUtil {
private final static String EMBEDDING_TAG = "div";
private final static String PAYLOAD_ATTRIBUTE_NAME = "jsonPayloadAsBase64";
private final static String JSON_IN_HTML_EMBEDDING_TEMPLATE = "<body><"+EMBEDDING_TAG+" "+PAYLOAD_ATTRIBUTE_NAME+"=\"%s\"></"+EMBEDDING_TAG+"></body>";
/**
* For file uploads through {@link FormPanel} elements, if the response is a JSON message (content type
* {@code application/json}) then the way the {@link FormPanel} intercepts this response (namely through
* an auxiliary {@code iframe} element into which the response is loaded) the content may get wrapped by
* a combination of {@code <pre>} and {@code </pre>} elements. In newer Chrome versions as of around
* 2024-04-15, additional {@code <div>} elements may be found after the closing {@code </pre>} tag.
* These elements persist through the {@link SubmitCompleteEvent#getResults()} method, and hence must be stripped
* off before trying to parse the results as JSON. This is that this method does.<p>
*
* Conversely, trying to use {@code text/html} as content encoding leads some
* browsers---especially on mobile devices---to do ugly things to the content returned, such as replacing digit
* sequences by a corresponding {@code <a>} element that allows the user to dial that number with the phone app...
*/
public static String getApplicationJsonContentFromHtml(final String resultHtml) {
final String base64EncodedJsonPayload = resultHtml.replaceFirst("^.*<"+EMBEDDING_TAG+" *"+PAYLOAD_ATTRIBUTE_NAME+"=\"([^\"]*)></"+EMBEDDING_TAG+">.*$", "$1");
return new String(Base64Utils.fromBase64(base64EncodedJsonPayload));
}
public static String getHtmlWithEmbeddedJsonContent(final String json) {
return String.format(JSON_IN_HTML_EMBEDDING_TEMPLATE, Base64Utils.toBase64(json.getBytes()));
}
}