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• OAJspUtil.java

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com.viaoa.web.OAJspUtil Maven / Gradle / Ivy

package com.viaoa.web;

import com.viaoa.util.OAString;

/**
 * Utility used to convert dynamic data for internal text, so that it is html and javascript safe.
 * 
 * Data that is sent as code to the browser needs to be converted, so that the code that is created for it
 * does not break, either within the javascript or html.
 * 
 * The outer js code will wrap the text in single or double quotes, and can then have html inside of it.
 * The html can also have js code in it, so there is various encoding/escaping that needs to be done
 * to have well formed js and html that will not break the back from processing it.
 * 
 * 
 * @author vvia
 */
public class OAJspUtil {
    
    /**
     * Helper method use to make sure that text is correctly escaped to be inside of javascript code.
     * This will call createJsString(text, '"', false, false) 
     */
/*    
    public static String createText(final String text) {
        String s = createJsString(text, '"', false, true);
        return s;
    }
    public static String createText(final String text, char quoteChar) {
        String s = createJsString(text, quoteChar, false, true);
        return s;
    }
    
    
    public static String createHtml(final String text) {
        String s = createJsString(text, '"', false, true);
        return s;
    }
    public static String createHtml(final String text,  char quoteChar) {
        String s = createJsString(text, quoteChar, false, true);
        return s;
    }
*/
    
    /*
     * This is only needed when putting html code/data inside of something that is quoted.
     * 
     * where data = "John's" and would need to be convertedto "John's"
     * example:  

     * @return
     */
    public static String createEmbeddedHtmlString(final String text, final char htmlQuoteChar) {
        String s;
        if (htmlQuoteChar == '\'') s = OAString.convert(text, "\'", "'");  // '  not yet supported
        else if (htmlQuoteChar == '\"') s = OAString.convert(text, "\"", """);  // "
        else s = text;
        return s;
    }

    /*
     * Javascript code that is inside of JS > Html 
     * example:   $('#id').html(" ..  ");
     */
    public static String createEmbeddedJsString(final String text, final char jsQuoteChar) {
        return _createJsString(text, jsQuoteChar, true);
    }
    
    
    public static String createJsString(final String text, final char jsQuoteChar) {
        return _createJsString(text, jsQuoteChar, false);
    }
    
    /*
     * First checks to see if it might be html.  If so, returns text, else converts [NL] to 
 and < > to html codes.
     */
    public static String convertToHtml(final String text) {
        if (text == null) return "";
        final int x = text.length();
        // check to see if there is html within the text.  If so, then dont convert.
        int cnt1 = 0;
        int cnt2 = 0;
        int cnt3 = 0;
        for (int i=0; i') cnt2++;
            else if (c == '\n') cnt3++;
        }
        if (cnt1 > 0 && cnt1 == cnt2) return text;  // guessing that this is already html
        
        if (cnt1 == 0 && cnt2 == 0 && cnt3 == 0) return text;

        StringBuilder sb = new StringBuilder(x+ (3*(cnt1 + cnt2 + cnt3)));
        
        for (int i=0; i");
                    break;
                case '<':
                    sb.append("<"); 
                    break;
                case '>':
                    sb.append(">"); 
                    break;
                case '\'':
                    sb.append("'"); 
                    break;
                case '\"':
                    sb.append("""); 
                    break;
                default:
                    sb.append(ch);
            }
        }
        return sb.toString();
        
    }
    
    /*
     * Converts a string to be used inside of a codegen Javascript screen
     * @param text
     * @param jsQuoteChar the char used for quoting the string
     * @param bIsJsCodeEmbeddedInHtml true if this is for js string that will be embedded inside of html
     * @param bMakeHtmlSafe if text should be check to see if < or > should be encoded.
     * @return string that can be put into a codegen js string and quoted with quoteChars
     */
    protected static String _createJsString(final String text, final char jsQuoteChar, final boolean bIsJsCodeEmbeddedInHtml) {
        if (text == null) return "";
        final int x = text.length();
        StringBuilder sb = null;

        for (int i=0; i 0) sb.append(text.substring(0, i));
                }
                
                if (ch == '\'') {
                    if (bIsJsCodeEmbeddedInHtml) sb.append("\\x27");  // x27 = "\'"
                    //was if (bIsJsCodeEmbeddedInHtml) sb.append("\\x5Cx27");  //  x5C = "\"   x27 = "\'"
                    else sb.append("\\"+jsQuoteChar);
                }
                else if (ch == '\"') {
                    if (bIsJsCodeEmbeddedInHtml) sb.append("\\x22");  // x22 = "\""
                    //was if (bIsJsCodeEmbeddedInHtml) sb.append("\\x5Cx22");  //  x5C = "\"   x22 = "\""
                    else sb.append("\\"+jsQuoteChar);
                }
                else if (ch == '<') {
                    sb.append("<");
                }
                else if (ch == '>') {
                    sb.append(">");
                }
                else if (ch == '\n') {
                    if (!bIsJsCodeEmbeddedInHtml) sb.append("\\n");
                    else sb.append("\\n"); //  \n
                    //was else sb.append("\\x5Cn"); //  \n
                }
                else if (ch == '\r') {
                    // no-op
                }
                else if (ch == '\\') {
                    if (!bIsJsCodeEmbeddedInHtml) sb.append("\\\\");
                    else sb.append("\\");
                    //was: else sb.append("\\x5C\\x5C"); // x5C = "\"
                }
            }
            else {
                if (sb != null) sb.append(ch);
            }
        }
        
        if (sb == null) {
            return text;
        }
        return sb.toString();
    }
}  
/*
if (ch == '&') {
    sb.append("&");
}
else if (ch == '"') {
    sb.append("""); // "
}
else if (ch == '\'') {
    sb.append("'"); // '  not yet supported
}
*/