qr-scanner/qr-scanner.min.js

class e{constructor(a,b,c,d,f){this._legacyCanvasSize=e.DEFAULT_CANVAS_SIZE;this._preferredCamera="environment";this._maxScansPerSecond=25;this._lastScanTimestamp=-1;this._destroyed=this._flashOn=this._paused=this._active=!1;this.$video=a;this.$canvas=document.createElement("canvas");c&&"object"===typeof c?this._onDecode=b:(c||d||f?console.warn("You're using a deprecated version of the QrScanner constructor which will be removed in the future"):console.warn("Note that the type of the scan result passed to onDecode will change in the future. To already switch to the new api today, you can pass returnDetailedScanResult: true."),
this._legacyOnDecode=b);b="object"===typeof c?c:{};this._onDecodeError=b.onDecodeError||("function"===typeof c?c:this._onDecodeError);this._calculateScanRegion=b.calculateScanRegion||("function"===typeof d?d:this._calculateScanRegion);this._preferredCamera=b.preferredCamera||f||this._preferredCamera;this._legacyCanvasSize="number"===typeof c?c:"number"===typeof d?d:this._legacyCanvasSize;this._maxScansPerSecond=b.maxScansPerSecond||this._maxScansPerSecond;this._onPlay=this._onPlay.bind(this);this._onLoadedMetaData=
this._onLoadedMetaData.bind(this);this._onVisibilityChange=this._onVisibilityChange.bind(this);this._updateOverlay=this._updateOverlay.bind(this);a.disablePictureInPicture=!0;a.playsInline=!0;a.muted=!0;let h=!1;a.hidden&&(a.hidden=!1,h=!0);document.body.contains(a)||(document.body.appendChild(a),h=!0);c=a.parentElement;if(b.highlightScanRegion||b.highlightCodeOutline){d=!!b.overlay;this.$overlay=b.overlay||document.createElement("div");f=this.$overlay.style;f.position="absolute";f.display="none";
f.pointerEvents="none";this.$overlay.classList.add("scan-region-highlight");if(!d&&b.highlightScanRegion){this.$overlay.innerHTML='<svg class="scan-region-highlight-svg" viewBox="0 0 238 238" preserveAspectRatio="none" style="position:absolute;width:100%;height:100%;left:0;top:0;fill:none;stroke:#e9b213;stroke-width:4;stroke-linecap:round;stroke-linejoin:round"><path d="M31 2H10a8 8 0 0 0-8 8v21M207 2h21a8 8 0 0 1 8 8v21m0 176v21a8 8 0 0 1-8 8h-21m-176 0H10a8 8 0 0 1-8-8v-21"/></svg>';try{this.$overlay.firstElementChild.animate({transform:["scale(.98)",
"scale(1.01)"]},{duration:400,iterations:Infinity,direction:"alternate",easing:"ease-in-out"})}catch(m){}c.insertBefore(this.$overlay,this.$video.nextSibling)}b.highlightCodeOutline&&(this.$overlay.insertAdjacentHTML("beforeend",'<svg class="code-outline-highlight" preserveAspectRatio="none" style="display:none;width:100%;height:100%;fill:none;stroke:#e9b213;stroke-width:5;stroke-dasharray:25;stroke-linecap:round;stroke-linejoin:round"><polygon/></svg>'),this.$codeOutlineHighlight=this.$overlay.lastElementChild)}this._scanRegion=
this._calculateScanRegion(a);requestAnimationFrame(()=>{let m=window.getComputedStyle(a);"none"===m.display&&(a.style.setProperty("display","block","important"),h=!0);"visible"!==m.visibility&&(a.style.setProperty("visibility","visible","important"),h=!0);h&&(console.warn("QrScanner has overwritten the video hiding style to avoid Safari stopping the playback."),a.style.opacity="0",a.style.width="0",a.style.height="0",this.$overlay&&this.$overlay.parentElement&&this.$overlay.parentElement.removeChild(this.$overlay),
delete this.$overlay,delete this.$codeOutlineHighlight);this.$overlay&&this._updateOverlay()});a.addEventListener("play",this._onPlay);a.addEventListener("loadedmetadata",this._onLoadedMetaData);document.addEventListener("visibilitychange",this._onVisibilityChange);window.addEventListener("resize",this._updateOverlay);this._qrEnginePromise=e.createQrEngine()}static set WORKER_PATH(a){console.warn("Setting QrScanner.WORKER_PATH is not required and not supported anymore. Have a look at the README for new setup instructions.")}static async hasCamera(){try{return!!(await e.listCameras(!1)).length}catch(a){return!1}}static async listCameras(a=
!1){if(!navigator.mediaDevices)return[];let b=async()=>(await navigator.mediaDevices.enumerateDevices()).filter(d=>"videoinput"===d.kind),c;try{a&&(await b()).every(d=>!d.label)&&(c=await navigator.mediaDevices.getUserMedia({audio:!1,video:!0}))}catch(d){}try{return(await b()).map((d,f)=>({id:d.deviceId,label:d.label||(0===f?"Default Camera":`Camera ${f+1}`)}))}finally{c&&(console.warn("Call listCameras after successfully starting a QR scanner to avoid creating a temporary video stream"),e._stopVideoStream(c))}}async hasFlash(){let a;
try{if(this.$video.srcObject){if(!(this.$video.srcObject instanceof MediaStream))return!1;a=this.$video.srcObject}else a=(await this._getCameraStream()).stream;return"torch"in a.getVideoTracks()[0].getSettings()}catch(b){return!1}finally{a&&a!==this.$video.srcObject&&(console.warn("Call hasFlash after successfully starting the scanner to avoid creating a temporary video stream"),e._stopVideoStream(a))}}isFlashOn(){return this._flashOn}async toggleFlash(){this._flashOn?await this.turnFlashOff():await this.turnFlashOn()}async turnFlashOn(){if(!this._flashOn&&
!this._destroyed&&(this._flashOn=!0,this._active&&!this._paused))try{if(!await this.hasFlash())throw"No flash available";await this.$video.srcObject.getVideoTracks()[0].applyConstraints({advanced:[{torch:!0}]})}catch(a){throw this._flashOn=!1,a;}}async turnFlashOff(){this._flashOn&&(this._flashOn=!1,await this._restartVideoStream())}destroy(){this.$video.removeEventListener("loadedmetadata",this._onLoadedMetaData);this.$video.removeEventListener("play",this._onPlay);document.removeEventListener("visibilitychange",
this._onVisibilityChange);window.removeEventListener("resize",this._updateOverlay);this._destroyed=!0;this._flashOn=!1;this.stop();e._postWorkerMessage(this._qrEnginePromise,"close")}async start(){if(this._destroyed)throw Error("The QR scanner can not be started as it had been destroyed.");if(!this._active||this._paused)if("https:"!==window.location.protocol&&console.warn("The camera stream is only accessible if the page is transferred via https."),this._active=!0,!document.hidden)if(this._paused=
!1,this.$video.srcObject)await this.$video.play();else try{let {stream:a,facingMode:b}=await this._getCameraStream();!this._active||this._paused?e._stopVideoStream(a):(this._setVideoMirror(b),this.$video.srcObject=a,await this.$video.play(),this._flashOn&&(this._flashOn=!1,this.turnFlashOn().catch(()=>{})))}catch(a){if(!this._paused)throw this._active=!1,a;}}stop(){this.pause();this._active=!1}async pause(a=!1){this._paused=!0;if(!this._active)return!0;this.$video.pause();this.$overlay&&(this.$overlay.style.display=
"none");let b=()=>{this.$video.srcObject instanceof MediaStream&&(e._stopVideoStream(this.$video.srcObject),this.$video.srcObject=null)};if(a)return b(),!0;await new Promise(c=>setTimeout(c,300));if(!this._paused)return!1;b();return!0}async setCamera(a){a!==this._preferredCamera&&(this._preferredCamera=a,await this._restartVideoStream())}static async scanImage(a,b,c,d,f=!1,h=!1){let m,n=!1;b&&("scanRegion"in b||"qrEngine"in b||"canvas"in b||"disallowCanvasResizing"in b||"alsoTryWithoutScanRegion"in
b||"returnDetailedScanResult"in b)?(m=b.scanRegion,c=b.qrEngine,d=b.canvas,f=b.disallowCanvasResizing||!1,h=b.alsoTryWithoutScanRegion||!1,n=!0):b||c||d||f||h?console.warn("You're using a deprecated api for scanImage which will be removed in the future."):console.warn("Note that the return type of scanImage will change in the future. To already switch to the new api today, you can pass returnDetailedScanResult: true.");b=!!c;try{let p,k;[c,p]=await Promise.all([c||e.createQrEngine(),e._loadImage(a)]);
[d,k]=e._drawToCanvas(p,m,d,f);let q;if(c instanceof Worker){let g=c;b||e._postWorkerMessageSync(g,"inversionMode","both");q=await new Promise((l,v)=>{let w,u,r,y=-1;u=t=>{t.data.id===y&&(g.removeEventListener("message",u),g.removeEventListener("error",r),clearTimeout(w),null!==t.data.data?l({data:t.data.data,cornerPoints:e._convertPoints(t.data.cornerPoints,m)}):v(e.NO_QR_CODE_FOUND))};r=t=>{g.removeEventListener("message",u);g.removeEventListener("error",r);clearTimeout(w);v("Scanner error: "+(t?
t.message||t:"Unknown Error"))};g.addEventListener("message",u);g.addEventListener("error",r);w=setTimeout(()=>r("timeout"),1E4);let x=k.getImageData(0,0,d.width,d.height);y=e._postWorkerMessageSync(g,"decode",x,[x.data.buffer])})}else q=await Promise.race([new Promise((g,l)=>window.setTimeout(()=>l("Scanner error: timeout"),1E4)),(async()=>{try{var [g]=await c.detect(d);if(!g)throw e.NO_QR_CODE_FOUND;return{data:g.rawValue,cornerPoints:e._convertPoints(g.cornerPoints,m)}}catch(l){g=l.message||l;
if(/not implemented|service unavailable/.test(g))return e._disableBarcodeDetector=!0,e.scanImage(a,{scanRegion:m,canvas:d,disallowCanvasResizing:f,alsoTryWithoutScanRegion:h});throw`Scanner error: ${g}`;}})()]);return n?q:q.data}catch(p){if(!m||!h)throw p;let k=await e.scanImage(a,{qrEngine:c,canvas:d,disallowCanvasResizing:f});return n?k:k.data}finally{b||e._postWorkerMessage(c,"close")}}setGrayscaleWeights(a,b,c,d=!0){e._postWorkerMessage(this._qrEnginePromise,"grayscaleWeights",{red:a,green:b,
blue:c,useIntegerApproximation:d})}setInversionMode(a){e._postWorkerMessage(this._qrEnginePromise,"inversionMode",a)}static async createQrEngine(a){a&&console.warn("Specifying a worker path is not required and not supported anymore.");return!e._disableBarcodeDetector&&"BarcodeDetector"in window&&BarcodeDetector.getSupportedFormats&&(await BarcodeDetector.getSupportedFormats()).includes("qr_code")?new BarcodeDetector({formats:["qr_code"]}):import("./qr-scanner-worker.min.js").then(b=>b.createWorker())}_onPlay(){this._scanRegion=
this._calculateScanRegion(this.$video);this._updateOverlay();this.$overlay&&(this.$overlay.style.display="");this._scanFrame()}_onLoadedMetaData(){this._scanRegion=this._calculateScanRegion(this.$video);this._updateOverlay()}_onVisibilityChange(){document.hidden?this.pause():this._active&&this.start()}_calculateScanRegion(a){let b=Math.round(2/3*Math.min(a.videoWidth,a.videoHeight));return{x:Math.round((a.videoWidth-b)/2),y:Math.round((a.videoHeight-b)/2),width:b,height:b,downScaledWidth:this._legacyCanvasSize,
downScaledHeight:this._legacyCanvasSize}}_updateOverlay(){requestAnimationFrame(()=>{if(this.$overlay){var a=this.$video,b=a.videoWidth,c=a.videoHeight,d=a.offsetWidth,f=a.offsetHeight,h=a.offsetLeft,m=a.offsetTop,n=window.getComputedStyle(a),p=n.objectFit,k=b/c,q=d/f;switch(p){case "none":var g=b;var l=c;break;case "fill":g=d;l=f;break;default:("cover"===p?k>q:k<q)?(l=f,g=l*k):(g=d,l=g/k),"scale-down"===p&&(g=Math.min(g,b),l=Math.min(l,c))}var [v,w]=n.objectPosition.split(" ").map((r,y)=>{const x=
parseFloat(r);return r.endsWith("%")?(y?f-l:d-g)*x/100:x});n=this._scanRegion.width||b;q=this._scanRegion.height||c;p=this._scanRegion.x||0;var u=this._scanRegion.y||0;k=this.$overlay.style;k.width=`${n/b*g}px`;k.height=`${q/c*l}px`;k.top=`${m+w+u/c*l}px`;c=/scaleX\(-1\)/.test(a.style.transform);k.left=`${h+(c?d-v-g:v)+(c?b-p-n:p)/b*g}px`;k.transform=a.style.transform}})}static _convertPoints(a,b){if(!b)return a;let c=b.x||0,d=b.y||0,f=b.width&&b.downScaledWidth?b.width/b.downScaledWidth:1;b=b.height&&
b.downScaledHeight?b.height/b.downScaledHeight:1;for(let h of a)h.x=h.x*f+c,h.y=h.y*b+d;return a}_scanFrame(){!this._active||this.$video.paused||this.$video.ended||("requestVideoFrameCallback"in this.$video?this.$video.requestVideoFrameCallback.bind(this.$video):requestAnimationFrame)(async()=>{if(!(1>=this.$video.readyState)){var a=Date.now()-this._lastScanTimestamp,b=1E3/this._maxScansPerSecond;a<b&&await new Promise(d=>setTimeout(d,b-a));this._lastScanTimestamp=Date.now();try{var c=await e.scanImage(this.$video,
{scanRegion:this._scanRegion,qrEngine:this._qrEnginePromise,canvas:this.$canvas})}catch(d){if(!this._active)return;this._onDecodeError(d)}!e._disableBarcodeDetector||await this._qrEnginePromise instanceof Worker||(this._qrEnginePromise=e.createQrEngine());c?(this._onDecode?this._onDecode(c):this._legacyOnDecode&&this._legacyOnDecode(c.data),this.$codeOutlineHighlight&&(clearTimeout(this._codeOutlineHighlightRemovalTimeout),this._codeOutlineHighlightRemovalTimeout=void 0,this.$codeOutlineHighlight.setAttribute("viewBox",
`${this._scanRegion.x||0} `+`${this._scanRegion.y||0} `+`${this._scanRegion.width||this.$video.videoWidth} `+`${this._scanRegion.height||this.$video.videoHeight}`),this.$codeOutlineHighlight.firstElementChild.setAttribute("points",c.cornerPoints.map(({x:d,y:f})=>`${d},${f}`).join(" ")),this.$codeOutlineHighlight.style.display="")):this.$codeOutlineHighlight&&!this._codeOutlineHighlightRemovalTimeout&&(this._codeOutlineHighlightRemovalTimeout=setTimeout(()=>this.$codeOutlineHighlight.style.display=
"none",100))}this._scanFrame()})}_onDecodeError(a){a!==e.NO_QR_CODE_FOUND&&console.log(a)}async _getCameraStream(){if(!navigator.mediaDevices)throw"Camera not found.";let a=/^(environment|user)$/.test(this._preferredCamera)?"facingMode":"deviceId",b=[{width:{min:1024}},{width:{min:768}},{}],c=b.map(d=>Object.assign({},d,{[a]:{exact:this._preferredCamera}}));for(let d of[...c,...b])try{let f=await navigator.mediaDevices.getUserMedia({video:d,audio:!1}),h=this._getFacingMode(f)||(d.facingMode?this._preferredCamera:
"environment"===this._preferredCamera?"user":"environment");return{stream:f,facingMode:h}}catch(f){}throw"Camera not found.";}async _restartVideoStream(){let a=this._paused;await this.pause(!0)&&!a&&this._active&&await this.start()}static _stopVideoStream(a){for(let b of a.getTracks())b.stop(),a.removeTrack(b)}_setVideoMirror(a){this.$video.style.transform="scaleX("+("user"===a?-1:1)+")"}_getFacingMode(a){return(a=a.getVideoTracks()[0])?/rear|back|environment/i.test(a.label)?"environment":/front|user|face/i.test(a.label)?
"user":null:null}static _drawToCanvas(a,b,c,d=!1){c=c||document.createElement("canvas");let f=b&&b.x?b.x:0,h=b&&b.y?b.y:0,m=b&&b.width?b.width:a.videoWidth||a.width,n=b&&b.height?b.height:a.videoHeight||a.height;d||(d=b&&b.downScaledWidth?b.downScaledWidth:m,b=b&&b.downScaledHeight?b.downScaledHeight:n,c.width!==d&&(c.width=d),c.height!==b&&(c.height=b));b=c.getContext("2d",{alpha:!1});b.imageSmoothingEnabled=!1;b.drawImage(a,f,h,m,n,0,0,c.width,c.height);return[c,b]}static async _loadImage(a){if(a instanceof
Image)return await e._awaitImageLoad(a),a;if(a instanceof HTMLVideoElement||a instanceof HTMLCanvasElement||a instanceof SVGImageElement||"OffscreenCanvas"in window&&a instanceof OffscreenCanvas||"ImageBitmap"in window&&a instanceof ImageBitmap)return a;if(a instanceof File||a instanceof Blob||a instanceof URL||"string"===typeof a){let b=new Image;b.src=a instanceof File||a instanceof Blob?URL.createObjectURL(a):a.toString();try{return await e._awaitImageLoad(b),b}finally{(a instanceof File||a instanceof
Blob)&&URL.revokeObjectURL(b.src)}}else throw"Unsupported image type.";}static async _awaitImageLoad(a){a.complete&&0!==a.naturalWidth||await new Promise((b,c)=>{let d=f=>{a.removeEventListener("load",d);a.removeEventListener("error",d);f instanceof ErrorEvent?c("Image load error"):b()};a.addEventListener("load",d);a.addEventListener("error",d)})}static async _postWorkerMessage(a,b,c,d){return e._postWorkerMessageSync(await a,b,c,d)}static _postWorkerMessageSync(a,b,c,d){if(!(a instanceof Worker))return-1;
let f=e._workerMessageId++;a.postMessage({id:f,type:b,data:c},d);return f}}e.DEFAULT_CANVAS_SIZE=400;e.NO_QR_CODE_FOUND="No QR code found";e._disableBarcodeDetector=!1;e._workerMessageId=0;export default e
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