commit 7e084236d3b821fdeceecedf48471c3ec6a5e407
parent 6def21181760ef42c66e6576137691847fdf0072
Author: Sebastian <sebasjm@taler-systems.com>
Date: Wed, 29 Apr 2026 14:55:39 -0300
fix #11356 couple of fixes
- use proper buffer before hashing to 256
- query paivana on origin instead of website
- request the merchant directly (instead of /.well-known/paivana/session/)
- qrjs inplace (instead of internet request to sauron)
Diffstat:
1 file changed, 174 insertions(+), 122 deletions(-)
diff --git a/contrib/paywall.en.must b/contrib/paywall.en.must
@@ -3,142 +3,194 @@
<head>
<title>Payment Required</title>
<meta http-equiv="content-type" content="text/html;CHARSET=utf-8">
- <!-- FIXME: probably should serve this ourselves... -->
- <script src="https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.min.js"
- integrity="sha512-CNgIRecGo7nphbeZ04Sc13ka07paqdeTu0WR1IM4kNcpmBAUSHSQX0FslNhTDadL4O5SAGapGt4FodqL8My0mA=="
- crossorigin="anonymous" referrerpolicy="no-referrer"></script>
- </head>
- <body>
- <h1>Payment Required</h1>
- <p>Scan the QR code or follow the link below with your
- <a href="https://wallet.taler.net">GNU Taler</a> wallet.</p>
-
- <div id="qrcode"></div>
- <p><a id="talerlink" href="#">Generating payment link...</a></p>
-
<script>
- (async () => {
-
+ const encTable = "0123456789ABCDEFGHJKMNPQRSTVWXYZ";
+ function encodeCrock(data) {
+ const dataBytes = new Uint8Array(data);
+ let sb = "";
+ const size = data.byteLength;
+ let bitBuf = 0;
+ let numBits = 0;
+ let pos = 0;
+ while (pos < size || numBits > 0) {
+ if (pos < size && numBits < 5) {
+ const d = dataBytes[pos++];
+ bitBuf = (bitBuf << 8) | d;
+ numBits += 8;
+ }
+ if (numBits < 5) {
+ bitBuf = bitBuf << (5 - numBits);
+ numBits = 5;
+ }
+ const v = (bitBuf >>> (numBits - 5)) & 31;
+ sb += encTable[v];
+ numBits -= 5;
+ }
+ return sb;
+ }
+ function timestampRoundedToBuffer(sec) {
+ const b = new ArrayBuffer(8);
+ const v = new DataView(b);
+ const numVal = BigInt(sec) * 1000n * 1000n;
+ // The buffer we sign over represents the timestamp in microseconds.
+ if (typeof v.setBigUint64 !== "undefined") {
+ v.setBigUint64(0, numVal);
+ } else {
+ const s = bigint(sec).multiply(1000 * 1000);
+ const arr = s.toArray(2 ** 8).value;
+ let offset = 8 - arr.length;
+ for (let i = 0; i < arr.length; i++) {
+ v.setUint8(offset++, arr[i]);
+ }
+ }
+ return new Uint8Array(b);
+ }
function waitMs(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
-
- // Note: good like this ONLY for short inputs...
- function toBase64Url(bytes) {
- let binary = String.fromCharCode(...bytes);
- return btoa(binary)
- .replace(/\+/g, '-')
- .replace(/\//g, '_')
- .replace(/=+$/, ''); // remove padding
+ async function sha256b64(data) {
+ const buf = await crypto.subtle.digest('SHA-256', data);
+ return new Uint8Array(buf).toBase64({alphabet: "base64url"}).replace(/=+$/, '');
}
-
- async function sha256b64(str) {
- const buf = await crypto.subtle.digest(
- 'SHA-256', new TextEncoder().encode(str));
- return toBase64Url(new Uint8Array(buf));
- }
-
- async function makePaivanaId(curTime, nonce, website) {
- const hash = await sha256b64(nonce + website + String(curTime));
+ async function makePaivanaId(curTime, nonceBuf, website) {
+ const websiteBuf = new TextEncoder().encode(`${website}\0`);
+ const curTimeBuf = timestampRoundedToBuffer(curTime);
+
+ const length = nonceBuf.length + websiteBuf.length + curTimeBuf.length;
+ const buf = new Uint8Array(length);
+ buf.set(nonceBuf, 0);
+ buf.set(websiteBuf, nonceBuf.length);
+ buf.set(curTimeBuf, nonceBuf.length + websiteBuf.length);
+ const hash = await sha256b64(buf);
return `${curTime}-${hash}`;
}
-
- const href = window.location.href;
- // This is a policy decision: we include the query parameters
- // in the website to support sites that need them, say if
- // "?page=42" is being used instead of "/pages/42".
- const website = href.split('#')[0];
- const metaMerchant = '{{ merchant_backend }}';
- const metaTemplate = '{{ template_id }}';
- const maxPickupDelay = {{ max_pickup_delay }}; // in seconds
- // cap at 100 years, we don't deal well with 'forever' otherwise
- const usePickupDelay = Math.min(maxPickupDelay, 60*60*24*356*100);
-
- // Strip trailing slash so we can append /templateId cleanly.
- const merchantBase = metaMerchant.replace(/\/$/, '');
- const merchantUrl = new URL(merchantBase);
- const merchantProto = merchantUrl.protocol;
- const suffix = merchantProto === 'http:' ? '+http' : '';
- const merchantHost = merchantUrl.host;
- const merchantPath = merchantUrl.path;
-
- const expTime = Math.floor(Date.now() / 1000) + maxPickupDelay;
- const nonceArr = new Uint8Array(32);
- crypto.getRandomValues(nonceArr);
- const nonce = Array.from(nonceArr)
- .map(b => b.toString(16).padStart(2, '0')).join('');
-
- const paivanaId = await makePaivanaId(expTime, nonce, website);
-
- const talerUri = [
- `taler${suffix}://pay-template/`,
- merchantHost,
- merchantPath,
- `/`,
- metaTemplate,
- `?session_id=${encodeURIComponent(paivanaId)}`,
- `&fulfillment_url=${encodeURIComponent(href)}`
- ].join('');
-
- const talerLink = document.getElementById('talerlink');
- talerLink.href = talerUri;
- talerLink.textContent = talerUri;
-
- new QRCode(document.getElementById('qrcode'), {
- text: talerUri,
- width: 200,
- height: 200,
- correctLevel: QRCode.CorrectLevel.M
- });
-
- async function confirmPayment(orderId) {
- talerLink.textContent = 'Payment confirmed! Loading page...';
- talerLink.href = '#';
- try {
- const res = await fetch(`${website}/.well-known/paivana`, {
- method: 'POST',
- headers: { 'Content-Type': 'application/json' },
- body: JSON.stringify({ order_id: orderId, nonce, cur_time: expTime, website }),
- });
- const dest = res.redirected ? res.url : website;
- // FIXME: 400 just for testing...
- await waitMs(400);
- location.href = dest;
- } catch (e) {
- console.warn('[paivana] confirm error:', e);
+ </script>
+ <script>
+ async function main() {
+ const href = window.location.href;
+ // This is a policy decision: we include the query parameters
+ // in the website to support sites that need them, say if
+ // "?page=42" is being used instead of "/pages/42".
+ const website = href.split('#')[0];
+ const origin = window.location.origin;
+ const metaMerchant = '{{ merchant_backend }}';
+ const metaTemplate = '{{ template_id }}';
+ const maxPickupDelay = {{ max_pickup_delay }}; // in seconds
+
+ // cap at 100 years, we don't deal well with 'forever' otherwise
+ const usePickupDelay = Math.min(maxPickupDelay, 60*60*24*356*100);
+
+ // Strip trailing slash so we can append /templateId cleanly.
+ const merchantBase = metaMerchant.replace(/\/$/, '');
+ const merchantUrl = new URL(merchantBase);
+ const merchantProto = merchantUrl.protocol;
+ const suffix = merchantProto === 'http:' ? '+http' : '';
+ const merchantHost = merchantUrl.host;
+ const merchantPath = merchantUrl.path;
+
+ const expTime = Math.floor(Date.now() / 1000) + maxPickupDelay;
+ const nonceBuf = new Uint8Array(16);
+ crypto.getRandomValues(nonceBuf);
+ const nonce = encodeCrock(nonceBuf.buffer);
+
+ const paivanaId = await makePaivanaId(expTime, nonceBuf, website);
+
+ const talerUri = [
+ `taler${suffix}://pay-template/`,
+ merchantHost,
+ merchantPath,
+ `/`,
+ metaTemplate,
+ `?session_id=${encodeURIComponent(paivanaId)}`,
+ `&fulfillment_url=${encodeURIComponent(href)}`
+ ].join('');
+
+ const talerLink = document.getElementById('talerlink');
+ talerLink.href = talerUri;
+ talerLink.textContent = talerUri;
+
+ new QRCode(document.getElementById('qrcode'), {
+ text: talerUri,
+ width: 200,
+ height: 200,
+ correctLevel: QRCode.CorrectLevel.M
+ });
+
+ async function confirmPayment(orderId) {
+ talerLink.textContent = 'Payment confirmed! Loading page...';
talerLink.href = '#';
- talerLink.textContent = 'Could not reach the server!';
+ try {
+ const res = await fetch(`${origin}/.well-known/paivana`, {
+ method: 'POST',
+ headers: { 'Content-Type': 'application/json' },
+ body: JSON.stringify({ order_id: orderId, nonce, cur_time: { t_s: expTime }, website }),
+ });
+ if (res.status >= 400) {
+ talerLink.textContent = 'Something went wrong';
+ const preError = document.createElement("pre")
+ preError.style = "text-wrap-mode = wrap";
+ preError.innerText = JSON.stringify(await res.json())
+ talerLink.parentElement.appendChild(preError);
+ }
+ const dest = res.redirected ? res.url : website;
+ await waitMs(400);
+ location.href = dest;
+ } catch (e) {
+ console.warn('[paivana] confirm error:', e);
+ talerLink.textContent = 'Could not reach the server!';
+ }
}
- }
- const pollBase = `${website}/.well-known/paivana/sessions/`
- + encodeURIComponent(paivanaId);
- while (true) {
- const start = performance.now();
- try {
- const res = await fetch(`${pollBase}?timeout_ms=30000`, { cache: 'no-store' });
- if (res.status === 200) {
- let orderId = null;
- try { orderId = (await res.json()).order_id ?? null; } catch (_) {}
- if (orderId) {
- await confirmPayment(orderId);
- } else {
- // FIXME: for testing...
- await waitMs(400);
- location.href = website;
+ const pollUrl = [
+ merchantBase,
+ "/sessions/",
+ encodeURIComponent(paivanaId),
+ "?fulfillment_url=",
+ encodeURIComponent(website),
+ "&timeout_ms=30000"
+ ].join("");
+
+ while (true) {
+ const start = performance.now();
+ try {
+ const res = await fetch(pollUrl, { cache: 'no-store' });
+ if (res.status === 200) {
+ let info = null;
+ try { info = await res.json() } catch (_) {}
+ console.log("got reponse from backend", res, info);
+ if (info.order_id) {
+ await confirmPayment(info.order_id);
+ } else {
+ // FIXME: for testing...
+ await waitMs(400);
+ location.href = website;
+ }
+ return;
}
- return;
+ } catch (e) {
+ console.warn('[paivana] poll error:', e);
+ talerLink.href = '#';
+ talerLink.textContent = 'Network error! Retrying...';
}
- } catch (e) {
- console.warn('[paivana] poll error:', e);
- talerLink.href = '#';
- talerLink.textContent = 'Network error! Retrying...';
+ const remMs = Math.round(30_000 - (performance.now() - start));
+ if (remMs > 0) await waitMs(remMs);
}
- const remMs = Math.round(30_000 - (performance.now() - start));
- if (remMs > 0) await waitMs(remMs);
- }
- })();
+ };
</script>
+ <!-- download from https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.min.js -->
+ <script integrity="sha512-CNgIRecGo7nphbeZ04Sc13ka07paqdeTu0WR1IM4kNcpmBAUSHSQX0FslNhTDadL4O5SAGapGt4FodqL8My0mA==">
+var QRCode;!function(){function a(a){this.mode=c.MODE_8BIT_BYTE,this.data=a,this.parsedData=[];for(var b=[],d=0,e=this.data.length;e>d;d++){var f=this.data.charCodeAt(d);f>65536?(b[0]=240|(1835008&f)>>>18,b[1]=128|(258048&f)>>>12,b[2]=128|(4032&f)>>>6,b[3]=128|63&f):f>2048?(b[0]=224|(61440&f)>>>12,b[1]=128|(4032&f)>>>6,b[2]=128|63&f):f>128?(b[0]=192|(1984&f)>>>6,b[1]=128|63&f):b[0]=f,this.parsedData=this.parsedData.concat(b)}this.parsedData.length!=this.data.length&&(this.parsedData.unshift(191),this.parsedData.unshift(187),this.parsedData.unshift(239))}function b(a,b){this.typeNumber=a,this.errorCorrectLevel=b,this.modules=null,this.moduleCount=0,this.dataCache=null,this.dataList=[]}function i(a,b){if(void 0==a.length)throw new Error(a.length+"/"+b);for(var c=0;c<a.length&&0==a[c];)c++;this.num=new Array(a.length-c+b);for(var d=0;d<a.length-c;d++)this.num[d]=a[d+c]}function j(a,b){this.totalCount=a,this.dataCount=b}function k(){this.buffer=[],this.length=0}function m(){return"undefined"!=typeof CanvasRenderingContext2D}function n(){var a=!1,b=navigator.userAgent;return/android/i.test(b)&&(a=!0,aMat=b.toString().match(/android ([0-9]\.[0-9])/i),aMat&&aMat[1]&&(a=parseFloat(aMat[1]))),a}function r(a,b){for(var c=1,e=s(a),f=0,g=l.length;g>=f;f++){var h=0;switch(b){case d.L:h=l[f][0];break;case d.M:h=l[f][1];break;case d.Q:h=l[f][2];break;case d.H:h=l[f][3]}if(h>=e)break;c++}if(c>l.length)throw new Error("Too long data");return c}function s(a){var b=encodeURI(a).toString().replace(/\%[0-9a-fA-F]{2}/g,"a");return b.length+(b.length!=a?3:0)}a.prototype={getLength:function(){return this.parsedData.length},write:function(a){for(var b=0,c=this.parsedData.length;c>b;b++)a.put(this.parsedData[b],8)}},b.prototype={addData:function(b){var c=new a(b);this.dataList.push(c),this.dataCache=null},isDark:function(a,b){if(0>a||this.moduleCount<=a||0>b||this.moduleCount<=b)throw new Error(a+","+b);return this.modules[a][b]},getModuleCount:function(){return this.moduleCount},make:function(){this.makeImpl(!1,this.getBestMaskPattern())},makeImpl:function(a,c){this.moduleCount=4*this.typeNumber+17,this.modules=new Array(this.moduleCount);for(var d=0;d<this.moduleCount;d++){this.modules[d]=new Array(this.moduleCount);for(var e=0;e<this.moduleCount;e++)this.modules[d][e]=null}this.setupPositionProbePattern(0,0),this.setupPositionProbePattern(this.moduleCount-7,0),this.setupPositionProbePattern(0,this.moduleCount-7),this.setupPositionAdjustPattern(),this.setupTimingPattern(),this.setupTypeInfo(a,c),this.typeNumber>=7&&this.setupTypeNumber(a),null==this.dataCache&&(this.dataCache=b.createData(this.typeNumber,this.errorCorrectLevel,this.dataList)),this.mapData(this.dataCache,c)},setupPositionProbePattern:function(a,b){for(var c=-1;7>=c;c++)if(!(-1>=a+c||this.moduleCount<=a+c))for(var d=-1;7>=d;d++)-1>=b+d||this.moduleCount<=b+d||(this.modules[a+c][b+d]=c>=0&&6>=c&&(0==d||6==d)||d>=0&&6>=d&&(0==c||6==c)||c>=2&&4>=c&&d>=2&&4>=d?!0:!1)},getBestMaskPattern:function(){for(var a=0,b=0,c=0;8>c;c++){this.makeImpl(!0,c);var d=f.getLostPoint(this);(0==c||a>d)&&(a=d,b=c)}return b},createMovieClip:function(a,b,c){var d=a.createEmptyMovieClip(b,c),e=1;this.make();for(var f=0;f<this.modules.length;f++)for(var g=f*e,h=0;h<this.modules[f].length;h++){var i=h*e,j=this.modules[f][h];j&&(d.beginFill(0,100),d.moveTo(i,g),d.lineTo(i+e,g),d.lineTo(i+e,g+e),d.lineTo(i,g+e),d.endFill())}return d},setupTimingPattern:function(){for(var a=8;a<this.moduleCount-8;a++)null==this.modules[a][6]&&(this.modules[a][6]=0==a%2);for(var b=8;b<this.moduleCount-8;b++)null==this.modules[6][b]&&(this.modules[6][b]=0==b%2)},setupPositionAdjustPattern:function(){for(var a=f.getPatternPosition(this.typeNumber),b=0;b<a.length;b++)for(var c=0;c<a.length;c++){var d=a[b],e=a[c];if(null==this.modules[d][e])for(var g=-2;2>=g;g++)for(var h=-2;2>=h;h++)this.modules[d+g][e+h]=-2==g||2==g||-2==h||2==h||0==g&&0==h?!0:!1}},setupTypeNumber:function(a){for(var b=f.getBCHTypeNumber(this.typeNumber),c=0;18>c;c++){var d=!a&&1==(1&b>>c);this.modules[Math.floor(c/3)][c%3+this.moduleCount-8-3]=d}for(var c=0;18>c;c++){var d=!a&&1==(1&b>>c);this.modules[c%3+this.moduleCount-8-3][Math.floor(c/3)]=d}},setupTypeInfo:function(a,b){for(var c=this.errorCorrectLevel<<3|b,d=f.getBCHTypeInfo(c),e=0;15>e;e++){var g=!a&&1==(1&d>>e);6>e?this.modules[e][8]=g:8>e?this.modules[e+1][8]=g:this.modules[this.moduleCount-15+e][8]=g}for(var e=0;15>e;e++){var g=!a&&1==(1&d>>e);8>e?this.modules[8][this.moduleCount-e-1]=g:9>e?this.modules[8][15-e-1+1]=g:this.modules[8][15-e-1]=g}this.modules[this.moduleCount-8][8]=!a},mapData:function(a,b){for(var c=-1,d=this.moduleCount-1,e=7,g=0,h=this.moduleCount-1;h>0;h-=2)for(6==h&&h--;;){for(var i=0;2>i;i++)if(null==this.modules[d][h-i]){var j=!1;g<a.length&&(j=1==(1&a[g]>>>e));var k=f.getMask(b,d,h-i);k&&(j=!j),this.modules[d][h-i]=j,e--,-1==e&&(g++,e=7)}if(d+=c,0>d||this.moduleCount<=d){d-=c,c=-c;break}}}},b.PAD0=236,b.PAD1=17,b.createData=function(a,c,d){for(var e=j.getRSBlocks(a,c),g=new k,h=0;h<d.length;h++){var i=d[h];g.put(i.mode,4),g.put(i.getLength(),f.getLengthInBits(i.mode,a)),i.write(g)}for(var l=0,h=0;h<e.length;h++)l+=e[h].dataCount;if(g.getLengthInBits()>8*l)throw new Error("code length overflow. ("+g.getLengthInBits()+">"+8*l+")");for(g.getLengthInBits()+4<=8*l&&g.put(0,4);0!=g.getLengthInBits()%8;)g.putBit(!1);for(;;){if(g.getLengthInBits()>=8*l)break;if(g.put(b.PAD0,8),g.getLengthInBits()>=8*l)break;g.put(b.PAD1,8)}return b.createBytes(g,e)},b.createBytes=function(a,b){for(var c=0,d=0,e=0,g=new Array(b.length),h=new Array(b.length),j=0;j<b.length;j++){var k=b[j].dataCount,l=b[j].totalCount-k;d=Math.max(d,k),e=Math.max(e,l),g[j]=new Array(k);for(var m=0;m<g[j].length;m++)g[j][m]=255&a.buffer[m+c];c+=k;var n=f.getErrorCorrectPolynomial(l),o=new i(g[j],n.getLength()-1),p=o.mod(n);h[j]=new Array(n.getLength()-1);for(var m=0;m<h[j].length;m++){var q=m+p.getLength()-h[j].length;h[j][m]=q>=0?p.get(q):0}}for(var r=0,m=0;m<b.length;m++)r+=b[m].totalCount;for(var s=new Array(r),t=0,m=0;d>m;m++)for(var j=0;j<b.length;j++)m<g[j].length&&(s[t++]=g[j][m]);for(var m=0;e>m;m++)for(var j=0;j<b.length;j++)m<h[j].length&&(s[t++]=h[j][m]);return s};for(var c={MODE_NUMBER:1,MODE_ALPHA_NUM:2,MODE_8BIT_BYTE:4,MODE_KANJI:8},d={L:1,M:0,Q:3,H:2},e={PATTERN000:0,PATTERN001:1,PATTERN010:2,PATTERN011:3,PATTERN100:4,PATTERN101:5,PATTERN110:6,PATTERN111:7},f={PATTERN_POSITION_TABLE:[[],[6,18],[6,22],[6,26],[6,30],[6,34],[6,22,38],[6,24,42],[6,26,46],[6,28,50],[6,30,54],[6,32,58],[6,34,62],[6,26,46,66],[6,26,48,70],[6,26,50,74],[6,30,54,78],[6,30,56,82],[6,30,58,86],[6,34,62,90],[6,28,50,72,94],[6,26,50,74,98],[6,30,54,78,102],[6,28,54,80,106],[6,32,58,84,110],[6,30,58,86,114],[6,34,62,90,118],[6,26,50,74,98,122],[6,30,54,78,102,126],[6,26,52,78,104,130],[6,30,56,82,108,134],[6,34,60,86,112,138],[6,30,58,86,114,142],[6,34,62,90,118,146],[6,30,54,78,102,126,150],[6,24,50,76,102,128,154],[6,28,54,80,106,132,158],[6,32,58,84,110,136,162],[6,26,54,82,110,138,166],[6,30,58,86,114,142,170]],G15:1335,G18:7973,G15_MASK:21522,getBCHTypeInfo:function(a){for(var 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e=0;b-6>e;e++)a.isDark(d,e)&&!a.isDark(d,e+1)&&a.isDark(d,e+2)&&a.isDark(d,e+3)&&a.isDark(d,e+4)&&!a.isDark(d,e+5)&&a.isDark(d,e+6)&&(c+=40);for(var e=0;b>e;e++)for(var d=0;b-6>d;d++)a.isDark(d,e)&&!a.isDark(d+1,e)&&a.isDark(d+2,e)&&a.isDark(d+3,e)&&a.isDark(d+4,e)&&!a.isDark(d+5,e)&&a.isDark(d+6,e)&&(c+=40);for(var k=0,e=0;b>e;e++)for(var d=0;b>d;d++)a.isDark(d,e)&&k++;var l=Math.abs(100*k/b/b-50)/5;return c+=10*l}},g={glog:function(a){if(1>a)throw new Error("glog("+a+")");return g.LOG_TABLE[a]},gexp:function(a){for(;0>a;)a+=255;for(;a>=256;)a-=255;return g.EXP_TABLE[a]},EXP_TABLE:new Array(256),LOG_TABLE:new Array(256)},h=0;8>h;h++)g.EXP_TABLE[h]=1<<h;for(var h=8;256>h;h++)g.EXP_TABLE[h]=g.EXP_TABLE[h-4]^g.EXP_TABLE[h-5]^g.EXP_TABLE[h-6]^g.EXP_TABLE[h-8];for(var h=0;255>h;h++)g.LOG_TABLE[g.EXP_TABLE[h]]=h;i.prototype={get:function(a){return this.num[a]},getLength:function(){return this.num.length},multiply:function(a){for(var b=new Array(this.getLength()+a.getLength()-1),c=0;c<this.getLength();c++)for(var d=0;d<a.getLength();d++)b[c+d]^=g.gexp(g.glog(this.get(c))+g.glog(a.get(d)));return new i(b,0)},mod:function(a){if(this.getLength()-a.getLength()<0)return this;for(var b=g.glog(this.get(0))-g.glog(a.get(0)),c=new Array(this.getLength()),d=0;d<this.getLength();d++)c[d]=this.get(d);for(var d=0;d<a.getLength();d++)c[d]^=g.gexp(g.glog(a.get(d))+b);return new 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c=j.getRsBlockTable(a,b);if(void 0==c)throw new Error("bad rs block @ typeNumber:"+a+"/errorCorrectLevel:"+b);for(var d=c.length/3,e=[],f=0;d>f;f++)for(var g=c[3*f+0],h=c[3*f+1],i=c[3*f+2],k=0;g>k;k++)e.push(new j(h,i));return e},j.getRsBlockTable=function(a,b){switch(b){case d.L:return j.RS_BLOCK_TABLE[4*(a-1)+0];case d.M:return j.RS_BLOCK_TABLE[4*(a-1)+1];case d.Q:return j.RS_BLOCK_TABLE[4*(a-1)+2];case d.H:return j.RS_BLOCK_TABLE[4*(a-1)+3];default:return void 0}},k.prototype={get:function(a){var b=Math.floor(a/8);return 1==(1&this.buffer[b]>>>7-a%8)},put:function(a,b){for(var c=0;b>c;c++)this.putBit(1==(1&a>>>b-c-1))},getLengthInBits:function(){return this.length},putBit:function(a){var b=Math.floor(this.length/8);this.buffer.length<=b&&this.buffer.push(0),a&&(this.buffer[b]|=128>>>this.length%8),this.length++}};var l=[[17,14,11,7],[32,26,20,14],[53,42,32,24],[78,62,46,34],[106,84,60,44],[134,106,74,58],[154,122,86,64],[192,152,108,84],[230,180,130,98],[271,213,151,119],[321,251,177,137],[367,287,203,155],[425,331,241,177],[458,362,258,194],[520,412,292,220],[586,450,322,250],[644,504,364,280],[718,560,394,310],[792,624,442,338],[858,666,482,382],[929,711,509,403],[1003,779,565,439],[1091,857,611,461],[1171,911,661,511],[1273,997,715,535],[1367,1059,751,593],[1465,1125,805,625],[1528,1190,868,658],[1628,1264,908,698],[1732,1370,982,742],[1840,1452,1030,790],[1952,1538,1112,842],[2068,1628,1168,898],[2188,1722,1228,958],[2303,1809,1283,983],[2431,1911,1351,1051],[2563,1989,1423,1093],[2699,2099,1499,1139],[2809,2213,1579,1219],[2953,2331,1663,1273]],o=function(){var a=function(a,b){this._el=a,this._htOption=b};return a.prototype.draw=function(a){function g(a,b){var c=document.createElementNS("http://www.w3.org/2000/svg",a);for(var d in b)b.hasOwnProperty(d)&&c.setAttribute(d,b[d]);return c}var b=this._htOption,c=this._el,d=a.getModuleCount();Math.floor(b.width/d),Math.floor(b.height/d),this.clear();var h=g("svg",{viewBox:"0 0 "+String(d)+" "+String(d),width:"100%",height:"100%",fill:b.colorLight});h.setAttributeNS("http://www.w3.org/2000/xmlns/","xmlns:xlink","http://www.w3.org/1999/xlink"),c.appendChild(h),h.appendChild(g("rect",{fill:b.colorDark,width:"1",height:"1",id:"template"}));for(var i=0;d>i;i++)for(var j=0;d>j;j++)if(a.isDark(i,j)){var k=g("use",{x:String(i),y:String(j)});k.setAttributeNS("http://www.w3.org/1999/xlink","href","#template"),h.appendChild(k)}},a.prototype.clear=function(){for(;this._el.hasChildNodes();)this._el.removeChild(this._el.lastChild)},a}(),p="svg"===document.documentElement.tagName.toLowerCase(),q=p?o:m()?function(){function a(){this._elImage.src=this._elCanvas.toDataURL("image/png"),this._elImage.style.display="block",this._elCanvas.style.display="none"}function d(a,b){var c=this;if(c._fFail=b,c._fSuccess=a,null===c._bSupportDataURI){var 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b(r(a,this._htOption.correctLevel),this._htOption.correctLevel),this._oQRCode.addData(a),this._oQRCode.make(),this._el.title=a,this._oDrawing.draw(this._oQRCode),this.makeImage()},QRCode.prototype.makeImage=function(){"function"==typeof this._oDrawing.makeImage&&(!this._android||this._android>=3)&&this._oDrawing.makeImage()},QRCode.prototype.clear=function(){this._oDrawing.clear()},QRCode.CorrectLevel=d}();
+ </script>
+ </head>
+ <body>
+ <h1>Payment Required</h1>
+ <p>Scan the QR code or follow the link below with your
+ <a href="https://wallet.taler.net">GNU Taler</a> wallet.</p>
+
+ <div id="qrcode"></div>
+ <p><a id="talerlink" href="#">Generating payment link...</a></p>
+
+ <script>main()</script>
</body>
</html>
