I want to format base64 encoded string, when I send the below string in JSON request - I am getting JSON validation error because this string is not formatted properly. I couldn't find any good utility which converts from base64 encoded string to the proper one.
Is there any utility in Java/Groovy or Javascript to format in a single line.
Appreciated your help
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}
// if this is your Base64 encoded string
var str = 'VGhpcyBpcyBhbiBhd2Vzb21lIHNjcmlwdA==';
// make URL friendly:
str = str.replace(/\+/g, '-').replace(/\//g, '_').replace(/\=+$/, '');
// reverse to original encoding
str = (str + '===').slice(0, str.length + (str.length % 4));
str = str.replace(/-/g, '+').replace(/_/g, '/');
If By Formatting what you mean is making it URL friendly, Above Goes the Code!
If you are referring to encoding and decoding of the String,
You can use btoa() and atob() to convert to and from base64 encoding
If I understood well you have problems to make a valid JSON with an base64 string.
I would recommend this:
Use the JavaScript function
JSON.stringify(encodedData) which returns an escaped string that you can use it with no problems in your JSON afterwards.
The encoded data is a PDF file, so it is binary data and you should not attempt to convert it to a String.
Instead, deal with the Bytes, for instance, by writing it to a file. In Groovy:
// String s = <your JSON>
Byte[] b = new groovy.json.JsonSlurper().parseText(s) // no errors here, the JSON you supplied is valid
."data" // GPath syntax for getting the "data" element in the JSON
.replaceAll (/\s/, "") // remove spaces and newlines
.decodeBase64() // returns an array of Byte
new File("somefile.pdf").bytes = b
Opening somefile.pdf, I can see:
Adobe Acrobat PDF Files
Adobe Portable Document Format (PDF) is a universal file format that preserves allof the fonts, formatting, colours and graphics of any source document, regardless ofthe application and platform used to create it.
...
If the encoded data had in fact been a String, you could get the original String just by String x = new String(b).
Related
I'm trying to assist a mobile developer with encrypting an image and uploading it to Azure blob storage. The mobile app uses expo and crypto js. I'm not super familiar with mobile dev or expo but it looks like expo gives you access to a base64 encoded version of the image.
My goal is to encrypt that image data, using crypto js, and upload it to Azure blob storage.
The specifics of expo or Azure aren't really that important to my question, but I figure they're worth mentioning. What is important, I think, is that I'm using crypto js to AES encrypt that image data.
I'm starting with a base64 string of image data and so I use crypto js to parse that like follows ...
const words = CryptoES.enc.Base64.parse(data);
This gives me a WordArray representing the image data, I think (from the base64 string which the mobile API gives me).
Next I can encrypt that image data like so ...
const encrypted = CryptoES.AES.encrypt(words, AES_KEY, { iv: AES_IV });
Now that I have the encrypted data, I would like to write it out to a file in just a binary hex format or whatever. I don't want base64 text in the file and I don't want a hex-string in the file - I'd like it to contain the literal encrypted data byte for byte.
I'm not sure how to get this data.
I guess it's just "toString" but when I do that it says invalid utf8. This is a JPG file that is being dealt with.
How can I get just the actual byte data and write that to a file with crypto js?
CryptoJS.AES.encrypt() returns a CipherParams object that encapsulates, among others, the ciphertext as WordArray. One possibility is to convert this WordArray to a Uint8Array with a custom method. In the following code this conversion is done by convertWordArrayToUint8Array():
function convertWordArrayToUint8Array(wordArray) {
var arrayOfWords = wordArray.hasOwnProperty("words") ? wordArray.words : [];
var length = wordArray.hasOwnProperty("sigBytes") ? wordArray.sigBytes : arrayOfWords.length * 4;
var uInt8Array = new Uint8Array(length), index=0, word, i;
for (i=0; i<length; i++) {
word = arrayOfWords[i];
uInt8Array[index++] = word >> 24;
uInt8Array[index++] = (word >> 16) & 0xff;
uInt8Array[index++] = (word >> 8) & 0xff;
uInt8Array[index++] = word & 0xff;
}
return uInt8Array;
}
var AES_KEY = CryptoJS.enc.Utf8.parse('0123456789012345');
var AES_IV = CryptoJS.enc.Utf8.parse('5432109876543210');
var plaintext = 'The quick brown fox jumps over the lazy dog';
var ciphertextCP = CryptoJS.AES.encrypt(plaintext, AES_KEY, { iv: AES_IV }); // CipherParams object
var ciphertextWA = ciphertextCP.ciphertext; // WordArray
var ciphertextArr = convertWordArrayToUint8Array(ciphertextWA); // Uint8Array
This Uint8Array can now be stored in a file, e.g. with:
var fileName = "encdata.bin";
saveByteArray([ciphertextArr], fileName);
using saveByteArray() from here.
Another approach is to convert the WordArray to a binary string using the Latin1 encoder:
var ciphertextBinStr = ciphertextWA.toString(CryptoJS.enc.Latin1);
which can then easily be converted to a Uint8Array, e.g. with:
function str2Uint8Array(str) {
const arr = new Uint8Array(new ArrayBuffer(str.length));
for (let i = 0, strLen = str.length; i < strLen; i++)
arr[i] = str.charCodeAt(i);
return arr;
}
var ciphertextArr = str2Uint8Array(ciphertextBinStr);
I have a XML string encoded in big5:
atob('PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iYmlnNSIgPz48dGl0bGU+pKSk5TwvdGl0bGU+')
(<?xml version="1.0" encoding="big5" ?><title>中文</title> in UTF-8.)
I'd like to extract the content of <title>. How can I do that with pure Javascript in browsers? Better to have lightweight solutions without jquery or emscripten.
Have tried DOMParser:
(new DOMParser()).parseFromString(atob('PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iYmlnNSIgPz48dGl0bGU+pKSk5TwvdGl0bGU+'), 'text/xml')
But neither Chromium nor Firefox respects the encoding attribute. Is it a standard that DOMParser supports UTF-8 only?
I suspect the issue isn't DOMParser, but atob, which can't properly decode what was originally a non-ascii string.*
You will need to use another method to get at the original bytes, such as using https://github.com/danguer/blog-examples/blob/master/js/base64-binary.js
var encoded = 'PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iYmlnNSIgPz48dGl0bGU+pKSk5TwvdGl0bGU+';
var bytes = Base64Binary.decode(encoded);
and then some method to convert the bytes (i.e. decode the big5 data) into a Javascript string. For Firefox / Chrome, you can use TextDecoder:
var decoder = new TextDecoder('big5');
var decoded = decoder.decode(bytes);
And then pass to DOMParser
var dom = (new DOMParser()).parseFromString(decoded, 'text/xml');
var title = dom.children[0].textContent;
You can see this at https://plnkr.co/edit/TBspXlF2vNbNaKq8UxhW?p=preview
*One way of understanding why: atob doesn't take the encoding of the original string as a parameter, so while it must internally decode base64 encoded data to bytes, it has to make an assumption on what character encoding those bytes are to then give you a Javascript string of characters, which I believe is internally encoded as UTF-16.
related: parse document from non-utf8 html
/**
* parse html document from http response. \
* also handle non-utf8 data.
*
* use this instead of
* ```
* const html = await response.text()
* const doc = new DOMParser().parseFromString(html, "text/html");
* ```
*
* #param {Response} response
* #return {Document}
*/
async function documentOfResponse(response) {
// example content-type: text/html; charset=ISO-8859-1
const type = response.headers.get("content-type").split(";")[0] || "text/html"
const charset = (response.headers.get("content-type").match(/;\s*charset=(.*)(?:;|$)/) || [])[1]
let html = ""
if (charset && charset != "UTF-8") { // TODO check more? utf-8, utf8, UTF8, ...
const decoder = new TextDecoder(charset)
const buffer = await response.arrayBuffer()
html = decoder.decode(buffer) // convert to utf8
}
else {
html = await response.text()
}
return new DOMParser().parseFromString(html, type)
}
// demo
const response = await fetch("https://github.com/")
const doc = await documentOfResponse(response)
const title = doc.querySelector("title")
console.log(title)
How do you convert a hex code represented in a string to a byte and the reverse in Javascript?
var conv = require('binstring');
var hexstring ='80';
var bytestring = conv(hexstring, {in:'hex', out:'utf8'});
var backtohexstring = conv(bytestring, {in:'utf8', out:'hex'}); // != '80'???
backtohexstring decodes an incoming data string to the correct hex (I also used utf8 vs. byte, because it 'looked' like the incoming string when printed to the console), so I'm confused...
I also found these two native javascript functions, the decoder works on my incoming stream, but I still can't get the hex to encode...
function encode_utf8( s ) {
return unescape( encodeURIComponent( s ) );
}
function decode_utf8( s ) {
return decodeURIComponent( escape( s ) );
}
Here's a node.js specific approach, taking advantage of the the Buffer class provided by the node standard lib.
https://nodejs.org/api/buffer.html#buffer_buffers_and_character_encodings
To get the byte (0-255) value:
Buffer.from('80', 'hex')[0];
// outputs 128
And to convert back:
Buffer.from([128]).toString('hex');
// outputs '80'
To convert to utf8:
Buffer.from('80', 'hex').toString('utf8');
You can make use of Number.prototype.toString and parseInt.
The key is to make use of the radix parameters to do the conversions for you.
var bytestring = Number('0x' + hexstring).toString(10); // '128'
parseInt(bytestring, 2).toString(16); // '80'
Any simple algo to compress/encode the guid string into a smaller string representation and then decode it back to guid. Any javascript code available for it.
Eg. 0a0a8907-40b9-4e81-8c4d-d01af26efb78 is using 36 characters. Can i reduce to string representation with around 20-24 characters...
I found a library which is able to convert HEX to BASE64 and backwards.
You basically need to strip every hyphen from the GUID and encode it:
var guid = "0a0a8907-40b9-4e81-8c4d-d01af26efb78";
var encoded = guid.replace(/-/g, "");
encoded = hexToBase64(encoded);
The receicing end then can decode it and put it back together:
var chunks = [];
chunks.push( decoded.substring(0, 8) );
chunks.push( decoded.substring(8, 12) );
chunks.push( decoded.substring(12, 16) );
chunks.push( decoded.substring(16, 20) );
chunks.push( decoded.substring(20) );
decoded = chunks.join("-");
The encoded version of your example GUID is CgqJB0C5ToGMTdAa8m77eA== and 24 characters long.
Check out this fiddle for a working example.
here is a simple routine that doesn't need an external library and stores the data in 12-24 actual bytes:
function encode(s){
return s.split("-").map(function(a,b,c){
return a.split(/(\w{4})/).filter(Boolean).map(function(aa,bb,cc){
return String.fromCharCode(parseInt(aa, 16))
}).join("");
}).join("|");
}
function decode(s){
return s.split("|").map(function(a){
return a.split("").map(function(aa){return String("0"+aa.charCodeAt(0).toString(16)).slice(-4) }).join("")
}).join("-");
}
var guid = "0a0a8907-40b9-4e81-8c4d-d01af26efb78"; //36 chars
var encoded=encode(guid); //=== "ਊ複|䂹|亁|豍|퀚ﭸ"
var guid2=decode(encoded);
alert([guid, guid2, encoded].join("\n"));
/* shows:
0a0a8907-40b9-4e81-8c4d-d01af26efb78
0a0a8907-40b9-4e81-8c4d-d01af26efb78
ਊ複|䂹|亁|豍|퀚ﭸ
12b
*/
this makes good use of localStorage, since it can store wide chars un-encoded. If you have to break out into ascii, they you're wasting time and space with this routine...
Convert the hex values to integers in 32 bit chunks then reencode the resulting string using base 64.
I have some problem such as. When I call webservice and Webservice return Dataset and output as following:
"\u003cNewDataSet\u003e\r\n \u003cTable\u003e\r\n \u003clSellLocID\u003e81\u003c/lSellLocID\u003e\r\n \u003cColumn1\u003e81\u003c/Column1\u003e\r\n \u003cszDescription\u003eAKL Airside sdda\u003c/szDescription\u003e\r\n \u003cbPreOrder\u003e0\u003c/bPreOrder\u003e\r\n \u003c/Table\u003e\r\n \u003cTable\u003e\r\n \u003clSellLocID\u003e82\u003c/lSellLocID\u003e\r\n \u003cColumn1\u003e82\u003c/Column1\u003e\r\n \u003cszDescription\u003eAKL Landsite\u003c/szDescription\u003e\r\n \u003cbPreOrder\u003e0\u003c/bPreOrder\u003e\r\n \u003c/Table\u003e\r\n \u003cTable\u003e\r\n \u003clSellLocID\u003e85\u003c/lSellLocID\u003e\r\n \u003cColumn1\u003e85\u003c/Column1\u003e\r\n \u003cszDescription\u003eAKL Arrival\u003c/szDescription\u003e\r\n \u003cbPreOrder\u003e0\u003c/bPreOrder\u003e\r\n \u003c/Table\u003e\r\n \u003cTable\u003e\r\n \u003clSellLocID\u003e886\u003c/lSellLocID\u003e\r\n \u003cColumn1\u003e886\u003c/Column1\u003e\r\n \u003cszDescription\u003e886-PreOrder\u003c/szDescription\u003e\r\n \u003cbPreOrder\u003e-1\u003c/bPreOrder\u003e\r\n \u003c/Table\u003e\r\n\u003c/NewDataSet\u003e"
I want it output XML format.
If this is the actual character data you have got, then you need to do some string replacements. Assuming the string is the value of a variable s, then you can do this:
s = s.replace(/\\u003c/gi,"<").replace(/\\u003e/gi,">").replace(/\\r\\n/g, "\n");