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helper_msgcoding.html
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helper_msgcoding.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>helper_msgcoding.html</title>
<style type="text/css">
.end-element { fill : #FFCCFF; }
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/raphael/2.3.0/raphael.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/flowchart/1.17.1/flowchart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.3.1/js/bootstrap.bundle.min.js"></script>
<!-- <script src="../release/flowchart.min.js"></script> -->
<script>
window.onload = function () {
var btn = document.getElementById("run"),
cd = document.getElementById("code"),
chart;
(btn.onclick = function () {
var code = cd.value;
if (chart) {
chart.clean();
}
chart = flowchart.parse(code);
chart.drawSVG('canvas', {
'x': 0,
'y': 0,
'line-width': 3,
//'maxWidth': 15,//ensures the flowcharts fits within a certain width
'line-length': 50,
'text-margin': 10,
'font-size': 14,
'font': 'normal',
'font-family': 'Helvetica',
'font-weight': 'normal',
'font-color': 'black',
'line-color': 'black',
'element-color': 'black',
'fill': 'white',
'yes-text': 'yes',
'no-text': 'no',
'arrow-end': 'block',
'scale': 1,
'symbols': {
'start': {
'font-size': 14,
'font-color': 'yellow',
'element-color': 'blue',
'fill': 'green',
'class': 'start-element'
},
'inputoutput': {
'font-color': 'black',
'element-color': 'black',
'fill': 'bisque'
},
'operation': {
'font-color': 'black',
'element-color': 'black',
'fill': 'linen'
},
'subroutine': {
'font-color': 'black',
'element-color': 'blue',
'fill': 'lightgreen'
},
'condition': {
'font-color': 'red',
'element-color': 'black',
'fill': 'yellow'
},
'end':{
'font-size': 20,
'class': 'end-element'
}
},
'flowstate' : {
//'past' : { 'fill' : '#CCCCCC', 'font-size' : 12},
//'current' : {'fill' : 'yellow', 'font-color' : 'red', 'font-weight' : 'bold'},
//'future' : { 'fill' : '#FFFF99'},
'request' : { 'fill' : 'blue'},
'invalid': {'fill' : '#444444'},
'approved' : { 'fill' : '#58C4A3', 'font-size' : 12, 'yes-text' : 'APPROVED', 'no-text' : 'n/a' },
'rejected' : { 'fill' : '#C45879', 'font-size' : 12, 'yes-text' : 'n/a', 'no-text' : 'REJECTED' }
}
});
//create base64 encoding of SVG to generate download link for title(without html or htm).SVG
var currentCanvasDIV = document.getElementById('canvas')
var currentDrawSVG = currentCanvasDIV.innerHTML.replaceAll('ë','e');
const OUTsvgBASE64 = btoa(currentDrawSVG)
doctitle = document.title.replace('.html','');
doctitle = doctitle.replace('.htm','');
var currentCanvasDIV = document.getElementById('canvas')
var currentDrawSVG = currentCanvasDIV.innerHTML.replaceAll('ë','e');
svgSource = currentDrawSVG
svgXML = currentDrawSVG;
// Use SVG Height and Width from the SVG XML to set canvas size
svgXMLsubstringHeight = svgXML.substring(svgXML.indexOf('height='), svgXML.indexOf('version='));
svgXMLsubstringWidth = svgXML.substring(svgXML.indexOf('width='), svgXML.indexOf('xmlns='));
HeightValue = svgXMLsubstringHeight.substring(svgXMLsubstringHeight.indexOf('"')+1,svgXMLsubstringHeight.lastIndexOf('"'));
WidthValue = svgXMLsubstringWidth.substring(svgXMLsubstringWidth.indexOf('"')+1,svgXMLsubstringWidth.lastIndexOf('"'));
HeightValueInt = Math.round(HeightValue)
WidthValueInt = Math.round(WidthValue)
// setup input for base64SvgToBase64Png
let svgSrc = "data:image/svg+xml;base64,"+OUTsvgBASE64;
var pngBase
imageUtil.base64SvgToBase64Png(svgSrc, WidthValueInt, HeightValueInt).then(pngSrc => {
pngBase = pngSrc
// output download link for base64 PNG converted on download from base64
var pngOutHtml = `<a href="${pngBase}" download="${doctitle}.png">PNG - Click here to download current rendered flowchart as ${doctitle}.png</a>`
document.getElementById("pngbase64").innerHTML=pngOutHtml;
});
// output download link for base64 SVG converted on download from base64
var svgOutHtml = `<a href="data:image/svg+xml;base64,${OUTsvgBASE64}" download=${doctitle}.svg>SVG - Click here to download current rendered flowchart as ${doctitle}.svg</a> `
document.getElementById("svgbase64").innerHTML=svgOutHtml;
})();
};
// derived from https://stackoverflow.com/a/64800570
// we need to use web browser canvas to generate a image. In this case png
let imageUtil = {};
/**
* converts a base64 encoded data url SVG image to a PNG image
* @param originalBase64 data url of svg image
* @param width target width in pixel of PNG image
* @param secondTry used internally to prevent endless recursion
* @return {Promise<unknown>} resolves to png data url of the image
*/
imageUtil.base64SvgToBase64Png = function (originalBase64, width, height, secondTry) {
return new Promise(resolve => {
let img = document.createElement('img');
img.onload = function () {
if (!secondTry && (img.naturalWidth === 0 || img.naturalHeight === 0)) {
let svgDoc = base64ToSvgDocument(originalBase64);
let fixedDoc = fixSvgDocumentFF(svgDoc);
return imageUtil.base64SvgToBase64Png(svgDocumentToBase64(fixedDoc), width, height, true).then(result => {
resolve(result);
});
}
//document.body.appendChild(img);
let canvas2 = document.createElement("canvas");
//document.body.removeChild(img);
canvas2.width = width;
canvas2.height = height;
let ctx = canvas2.getContext("2d");
ctx.drawImage(img, 0, 0, canvas2.width, canvas2.height);
try {
let data = canvas2.toDataURL('image/png');
resolve(data);
} catch (e) {
resolve(null);
}
};
img.src = originalBase64;
});
}
//needed because Firefox doesn't correctly handle SVG with size = 0, see https://bugzilla.mozilla.org/show_bug.cgi?id=700533
function fixSvgDocumentFF(svgDocument) {
try {
let widthInt = parseInt(svgDocument.documentElement.width.baseVal.value) || 500;
let heightInt = parseInt(svgDocument.documentElement.height.baseVal.value) || 500;
svgDocument.documentElement.width.baseVal.newValueSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_PX, widthInt);
svgDocument.documentElement.height.baseVal.newValueSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_PX, heightInt);
return svgDocument;
} catch (e) {
return svgDocument;
}
}
function svgDocumentToBase64(svgDocument) {
try {
let base64EncodedSVG = btoa(new XMLSerializer().serializeToString(svgDocument));
return 'data:image/svg+xml;base64,' + base64EncodedSVG;
} catch (e) {
return null;
}
}
function base64ToSvgDocument(base64) {
let svg = atob(base64.substring(base64.indexOf('base64,') + 7));
svg = svg.substring(svg.indexOf('<svg'));
let parser = new DOMParser();
return parser.parseFromString(svg, "image/svg+xml");
}
</script>
<script>
function HelpText() {
var x = document.getElementById("HelpTextBlock");
if (x.style.display === "none") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
</script>
</head>
<body>
<div><textarea id="code" style="width: 100%;" rows="11">op2=>operation: '\nMessage encoding end decoding functions\n'
op4=>operation: import string
op6=>operation: import zlib
op8=>operation: import messagetypes
op10=>operation: from bmconfigparser import config
op12=>operation: from debug import logger
op14=>operation: from tr import _translate
op16=>operation: try:
import msgpack
except ImportError:
try:
import umsgpack as msgpack
except ImportError:
import fallback.umsgpack.umsgpack as msgpack
op18=>operation: BITMESSAGE_ENCODING_IGNORE = 0
op20=>operation: BITMESSAGE_ENCODING_TRIVIAL = 1
op22=>operation: BITMESSAGE_ENCODING_SIMPLE = 2
op24=>operation: BITMESSAGE_ENCODING_EXTENDED = 3
op26=>operation: class MsgEncodeException(Exception):
'Exception during message encoding'
pass
op28=>operation: class MsgDecodeException(Exception):
'Exception during message decoding'
pass
op30=>operation: class DecompressionSizeException(MsgDecodeException):
'Decompression resulted in too much data (attack protection)'
def __init__(self, size):
self.size = size
op32=>operation: class MsgEncode(object):
'Message encoder class'
def __init__(self, message, encoding=BITMESSAGE_ENCODING_SIMPLE):
self.data = None
self.encoding = encoding
self.length = 0
if (self.encoding == BITMESSAGE_ENCODING_EXTENDED):
self.encodeExtended(message)
elif (self.encoding == BITMESSAGE_ENCODING_SIMPLE):
self.encodeSimple(message)
elif (self.encoding == BITMESSAGE_ENCODING_TRIVIAL):
self.encodeTrivial(message)
else:
raise MsgEncodeException(('Unknown encoding %i' % encoding))
def encodeExtended(self, message):
'Handle extended encoding'
try:
msgObj = messagetypes.message.Message()
self.data = zlib.compress(msgpack.dumps(msgObj.encode(message)), 9)
except zlib.error:
logger.error('Error compressing message')
raise MsgEncodeException('Error compressing message')
except msgpack.exceptions.PackException:
logger.error('Error msgpacking message')
raise MsgEncodeException('Error msgpacking message')
self.length = len(self.data)
def encodeSimple(self, message):
'Handle simple encoding'
self.data = ('Subject:%(subject)s\nBody:%(body)s' % message)
self.length = len(self.data)
def encodeTrivial(self, message):
'Handle trivial encoding'
self.data = message['body']
self.length = len(self.data)
op34=>operation: class MsgDecode(object):
'Message decoder class'
def __init__(self, encoding, data):
self.encoding = encoding
if (self.encoding == BITMESSAGE_ENCODING_EXTENDED):
self.decodeExtended(data)
elif (self.encoding in (BITMESSAGE_ENCODING_SIMPLE, BITMESSAGE_ENCODING_TRIVIAL)):
self.decodeSimple(data)
else:
self.body = _translate('MsgDecode', 'The message has an unknown encoding.\nPerhaps you should upgrade Bitmessage.')
self.subject = _translate('MsgDecode', 'Unknown encoding')
def decodeExtended(self, data):
'Handle extended encoding'
dc = zlib.decompressobj()
tmp = ''
while (len(tmp) <= config.safeGetInt('zlib', 'maxsize')):
try:
got = dc.decompress(data, ((config.safeGetInt('zlib', 'maxsize') + 1) - len(tmp)))
if (got == ''):
break
tmp += got
data = dc.unconsumed_tail
except zlib.error:
logger.error('Error decompressing message')
raise MsgDecodeException('Error decompressing message')
else:
raise DecompressionSizeException(len(tmp))
try:
tmp = msgpack.loads(tmp)
except (msgpack.exceptions.UnpackException, msgpack.exceptions.ExtraData):
logger.error('Error msgunpacking message')
raise MsgDecodeException('Error msgunpacking message')
try:
msgType = tmp['']
except KeyError:
logger.error('Message type missing')
raise MsgDecodeException('Message type missing')
msgObj = messagetypes.constructObject(tmp)
if (msgObj is None):
raise MsgDecodeException('Malformed message')
try:
msgObj.process()
except:
raise MsgDecodeException('Malformed message')
if (msgType == 'message'):
self.subject = msgObj.subject
self.body = msgObj.body
def decodeSimple(self, data):
'Handle simple encoding'
bodyPositionIndex = string.find(data, '\nBody:')
if (bodyPositionIndex > 1):
subject = data[8:bodyPositionIndex]
subject = subject[:500]
body = data[(bodyPositionIndex + 6):]
else:
subject = ''
body = data
if subject:
subject = subject.splitlines()[0]
self.subject = subject
self.body = body
op2->op4
op4->op6
op6->op8
op8->op10
op10->op12
op12->op14
op14->op16
op16->op18
op18->op20
op20->op22
op22->op24
op24->op26
op26->op28
op28->op30
op30->op32
op32->op34
</textarea></div>
<div><button id="run" type="button">Run</button> <button onclick="HelpText()">Format Help</button></div>
<div id="HelpTextBlock" style="display:none"><br/>Conditions can also be redirected like cond(yes, bottom) or cond(yes, right)
... and the other symbols too... like sub1(right)<br/>
You can also tweak the <b>diagram.drawSVG('diagram', {});</b> script in this file for more changes<br/>
This is based on <a href="https://github.com/adrai/flowchart.js">flowchart.js on github</a> and <a href="http://flowchart.js.org">http://flowchart.js.org</a> more documentation can be found over there.
</div><br/><div id="svgbase64"></div>
<div id="pngbase64"></div>
<div id="canvas"></div>
</body>
</html>