qr-scanner/qr-scanner.min.js

class e{constructor(a,b,c,d,f){this._legacyCanvasSize=e.DEFAULT_CANVAS_SIZE;this._preferredCamera="environment";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._scanRegion=this._calculateScanRegion(a);this._onPlay=this._onPlay.bind(this);this._onLoadedMetaData=this._onLoadedMetaData.bind(this);
this._onVisibilityChange=this._onVisibilityChange.bind(this);a.disablePictureInPicture=!0;a.playsInline=!0;a.muted=!0;let g=!1;a.hidden&&(a.hidden=!1,g=!0);document.body.contains(a)||(document.body.appendChild(a),g=!0);requestAnimationFrame(()=>{let k=window.getComputedStyle(a);"none"===k.display&&(a.style.setProperty("display","block","important"),g=!0);"visible"!==k.visibility&&(a.style.setProperty("visibility","visible","important"),g=!0);g&&(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")});a.addEventListener("play",this._onPlay);a.addEventListener("loadedmetadata",this._onLoadedMetaData);document.addEventListener("visibilitychange",this._onVisibilityChange);this._qrEnginePromise=e.createQrEngine()}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);
this._destroyed=!0;this._flashOn=!1;this.stop();e._postWorkerMessage(this._qrEnginePromise,"close")}async start(){if(!(this._active&&!this._paused||this._destroyed||("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.$video.pause();let b=()=>{this.$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,g=!1){let k,m=!1;b&&("scanRegion"in b||"qrEngine"in b||"canvas"in b||"disallowCanvasResizing"in b||"alsoTryWithoutScanRegion"in b||"returnDetailedScanResult"in b)?(k=b.scanRegion,c=b.qrEngine,d=b.canvas,f=b.disallowCanvasResizing||!1,g=b.alsoTryWithoutScanRegion||!1,m=!0):b||c||d||f||g?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 q,n;[c,q]=await Promise.all([c||e.createQrEngine(),e._loadImage(a)]);[d,n]=e._drawToCanvas(q,k,d,f);if(c instanceof Worker){let h=c;b||h.postMessage({type:"inversionMode",data:"both"});return await new Promise((t,v)=>{let u,r,p;r=l=>{"qrResult"===l.data.type&&(h.removeEventListener("message",r),h.removeEventListener("error",
p),clearTimeout(u),null!==l.data.data?t(m?{data:l.data.data,cornerPoints:e._convertPoints(l.data.cornerPoints,k)}:l.data.data):v(e.NO_QR_CODE_FOUND))};p=l=>{h.removeEventListener("message",r);h.removeEventListener("error",p);clearTimeout(u);v("Scanner error: "+(l?l.message||l:"Unknown Error"))};h.addEventListener("message",r);h.addEventListener("error",p);u=setTimeout(()=>p("timeout"),1E4);let w=n.getImageData(0,0,d.width,d.height);h.postMessage({type:"decode",data:w},[w.data.buffer])})}return await Promise.race([new Promise((h,
t)=>window.setTimeout(()=>t("Scanner error: timeout"),1E4)),(async()=>{try{let [h]=await c.detect(d);if(!h)throw e.NO_QR_CODE_FOUND;return m?{data:h.rawValue,cornerPoints:e._convertPoints(h.cornerPoints,k)}:h.rawValue}catch(h){throw`Scanner error: ${h.message||h}`;}})()])}catch(q){if(!k||!g)throw q;let n=await e.scanImage(a,{qrEngine:c,canvas:d,disallowCanvasResizing:f});return m?n:n.data}finally{b||e._postWorkerMessage(c,"close")}}setGrayscaleWeights(a,b,c,d=!0){e._postWorkerMessage(this._qrEnginePromise,
"grayscaleWeights",{red:a,green:b,blue:c,useIntegerApproximation:d})}setInversionMode(a){e._postWorkerMessage(this._qrEnginePromise,"inversionMode",a)}static async createQrEngine(a=e.WORKER_PATH){return"BarcodeDetector"in window&&BarcodeDetector.getSupportedFormats&&(await BarcodeDetector.getSupportedFormats()).includes("qr_code")?new BarcodeDetector({formats:["qr_code"]}):new Worker(a)}_onPlay(){this._scanRegion=this._calculateScanRegion(this.$video);this._scanFrame()}_onLoadedMetaData(){this._scanRegion=
this._calculateScanRegion(this.$video)}_onVisibilityChange(){document.hidden?this.pause():this._active&&this.start()}_calculateScanRegion(a){let b=Math.round(2/3*Math.min(a.videoWidth,a.videoHeight));return{x:Math.round((a.videoWidth-b)/2),y:Math.round((a.videoHeight-b)/2),width:b,height:b,downScaledWidth:this._legacyCanvasSize,downScaledHeight:this._legacyCanvasSize}}static _convertPoints(a,b){if(!b)return a;let c=b.x||0,d=b.y||0,f=b.width&&b.downScaledWidth?b.width/b.downScaledWidth:1;b=b.height&&
b.downScaledHeight?b.height/b.downScaledHeight:1;for(let g of a)g.x=g.x*f+c,g.y=g.y*b+d;return a}_scanFrame(){!this._active||this.$video.paused||this.$video.ended||requestAnimationFrame(async()=>{if(!(1>=this.$video.readyState)){try{var a=await e.scanImage(this.$video,{scanRegion:this._scanRegion,qrEngine:this._qrEnginePromise,canvas:this.$canvas})}catch(b){if(!this._active)return;(b.message||b).includes("service unavailable")&&(this._qrEnginePromise=e.createQrEngine());this._onDecodeError(b)}a&&
this._onDecode?this._onDecode(a):a&&this._legacyOnDecode&&this._legacyOnDecode(a.data)}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)$/.test(this._preferredCamera)?"facingMode":"deviceId",b=[{width:{min:1024}},{width:{min:768}},{}],c=b.map(d=>Object.assign({},d,{[a]:{exact:this._preferredCamera}}));for(let d of[...c,...b])try{let f=await navigator.mediaDevices.getUserMedia({video:d,
audio:!1}),g=this._getFacingMode(f)||(d.facingMode?this._preferredCamera:"environment"===this._preferredCamera?"user":"environment");return{stream:f,facingMode:g}}catch(f){}throw"Camera not found.";}async _restartVideoStream(){let a=this._paused;await this.pause(!0)&&!a&&this._active&&await this.start()}static _stopVideoStream(a){for(let b of a.getTracks())b.stop(),a.removeTrack(b)}_setVideoMirror(a){this.$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,g=b&&b.y?b.y:0,k=b&&b.width?b.width:a.videoWidth||a.width,m=b&&b.height?b.height:a.videoHeight||a.height;d||(d=b&&b.downScaledWidth?b.downScaledWidth:k,b=b&&b.downScaledHeight?b.downScaledHeight:m,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,g,k,m,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){a=await a;a instanceof
Worker&&a.postMessage({type:b,data:c})}}e.DEFAULT_CANVAS_SIZE=400;e.NO_QR_CODE_FOUND="No QR code found";e.WORKER_PATH="qr-scanner-worker.min.js";export default e
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