[Kimchi-devel] [PATCH] add a Base64 saftURL encode and decode function

[Sheldon]

On 07/17/2014 08:51 AM, Aline Manera wrote:
>
> Thanks for the patch, Sheldon!
>
> But for the next_url I was able to use urllib2 and encodeURIcomponent()
> That way we keep consistent the communication between backend and UI
>
> Maybe we can add this base64 code for future matters.
I does not matter.

I just make a mini change for the ui/js/novnc/base64.js

Also js support a btoa/atob for base64 decode and encode
btoa("abcdef")
"YWJjZGVm"

atob("YWJjZGVm")
"abcdef"

if encodeURIcomponent is OK, we can use it.
>
> On 07/16/2014 01:53 PM, shaohef at linux.vnet.ibm.com wrote:
>> From: ShaoHe Feng <shaohef at linux.vnet.ibm.com>
>>
>> These two functions are similar to the functions in
>> ui/js/novnc/base64.js
>>
>> usage:
>> --- a/ui/pages/login.html.tmpl
>> +++ b/ui/pages/login.html.tmpl
>> @@ -36,6 +36,7 @@
>> <script src="$href('libs/jquery-ui.min.js')"></script>
>> <script src="$href('libs/jquery-ui-i18n.min.js')"></script>
>> <script src="$href('js/kimchi.min.js')"></script>
>> +<script src="$href('js/Base64saftURL.js')"></script>
>> <style type="text/css">
>> .topbar select {
>> float: right;
>>
>> then in UI:
>> Base64.encode("f4>&^bc")
>> "ZjQ-Jl5iYw=="
>> Base64.decode("ZjQ-Jl5iYw==")
>> "f4>&^bc"
>>
>> this is just a sample.
>>
>> we can add it to ui/js/src/kimchi.utils.js
>>
>> Signed-off-by: ShaoHe Feng <shaohef at linux.vnet.ibm.com>
>> ---
>> ui/js/Base64saftURL.js | 110 
>> +++++++++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 110 insertions(+)
>> create mode 100644 ui/js/Base64saftURL.js
>>
>> diff --git a/ui/js/Base64saftURL.js b/ui/js/Base64saftURL.js
>> new file mode 100644
>> index 0000000..8880a7e
>> --- /dev/null
>> +++ b/ui/js/Base64saftURL.js
>> @@ -0,0 +1,110 @@
>> +/* This Source Code Form is subject to the terms of the Mozilla Public
>> + * License, v. 2.0. If a copy of the MPL was not distributed with this
>> + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
>> +
>> +// From: 
>> http://hg.mozilla.org/mozilla-central/raw-file/ec10630b1a54/js/src/devtools/jint/sunspider/string-base64.js
>> +
>> +/*jslint white: false, bitwise: false, plusplus: false */
>> +/*global console */
>> +
>> +var Base64 = {
>> +
>> +/* Convert data (an array of integers) to a Base64 string. */
>> +toBase64Table : 
>> 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_='.split(''),
>> +base64Pad : '=',
>> +
>> +encode: function (data) {
>> + "use strict";
>> + var result = '';
>> + var toBase64Table = Base64.toBase64Table;
>> + var length = data.length
>> + var lengthpad = (length%3);
>> + var i = 0, j = 0;
>> + // Convert every three bytes to 4 ascii characters.
>> + /* BEGIN LOOP */
>> + for (i = 0; i < (length - 2); i += 3) {
>> + result += toBase64Table[data.charCodeAt(i) >> 2];
>> + result += toBase64Table[((data.charCodeAt(i) & 0x03) << 4) + 
>> (data.charCodeAt(i+1) >> 4)];
>> + result += toBase64Table[((data.charCodeAt(i+1) & 0x0f) << 2) + 
>> (data.charCodeAt(i+2) >> 6)];
>> + result += toBase64Table[data.charCodeAt(i+2) & 0x3f];
>> + }
>> + /* END LOOP */
>> +
>> + // Convert the remaining 1 or 2 bytes, pad out to 4 characters.
>> + if (lengthpad === 2) {
>> + j = length - lengthpad;
>> + result += toBase64Table[data.charCodeAt(j) >> 2];
>> + result += toBase64Table[((data.charCodeAt(j) & 0x03) << 4) + 
>> (data.charCodeAt(j+1) >> 4)];
>> + result += toBase64Table[(data.charCodeAt(j+1) & 0x0f) << 2];
>> + result += toBase64Table[64];
>> + } else if (lengthpad === 1) {
>> + j = length - lengthpad;
>> + result += toBase64Table[data.charCodeAt(j) >> 2];
>> + result += toBase64Table[(data.charCodeAt(j) & 0x03) << 4];
>> + result += toBase64Table[64];
>> + result += toBase64Table[64];
>> + }
>> +
>> + return result;
>> +},
>> +
>> +/* Convert Base64 data to a string */
>> +toBinaryTable : [
>> + -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
>> + -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
>> + -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,62,-1,-1,
>> + 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
>> + -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
>> + 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,63,
>> + -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
>> + 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
>> +],
>> +
>> +decode: function (data, offset) {
>> + "use strict";
>> + offset = typeof(offset) !== 'undefined' ? offset : 0;
>> + var toBinaryTable = Base64.toBinaryTable;
>> + var base64Pad = Base64.base64Pad;
>> + var result, result_length, idx, i, c, padding;
>> + var leftbits = 0; // number of bits decoded, but yet to be appended
>> + var leftdata = 0; // bits decoded, but yet to be appended
>> +
>> + // Convert one by one.
>> + /* BEGIN LOOP */
>> + result = ""
>> + for (idx = 0, i = offset; i < data.length; i++) {
>> + c = toBinaryTable[data.charCodeAt(i) & 0x7f];
>> + padding = (data.charAt(i) === base64Pad);
>> + // Skip illegal characters and whitespace
>> + if (c === -1) {
>> + console.error("Illegal character code " + data.charCodeAt(i) + " at 
>> position " + i);
>> + continue;
>> + }
>> +
>> + // Collect data into leftdata, update bitcount
>> + leftdata = (leftdata << 6) | c;
>> + leftbits += 6;
>> +
>> + // If we have 8 or more bits, append 8 bits to the result
>> + if (leftbits >= 8) {
>> + leftbits -= 8;
>> + // Append if not padding.
>> + if (!padding) {
>> + idx++;
>> + result += String.fromCharCode((leftdata >> leftbits) & 0xff);
>> + }
>> + leftdata &= (1 << leftbits) - 1;
>> + }
>> + }
>> + /* END LOOP */
>> +
>> + // If there are any bits left, the base64 string was corrupted
>> + if (leftbits) {
>> + throw {name: 'Base64-Error',
>> + message: 'Corrupted base64 string'};
>> + }
>> +
>> + return result;
>> +}
>> +
>> +}; /* End of Base64 namespace */
>
>
>


-- 
Thanks and best regards!

Sheldon Feng(冯少合)<shaohef at linux.vnet.ibm.com>
IBM Linux Technology Center