qr-scanner.min.js

class e{static hasCamera(){return navigator.mediaDevices?navigator.mediaDevices.enumerateDevices().then(a=>a.some(a=>"videoinput"===a.kind)).catch(()=>!1):Promise.resolve(!1)}constructor(a,b,c=this._onDecodeError,d=this._calculateScanRegion,f="environment"){this.$video=a;this.$canvas=document.createElement("canvas");this._onDecode=b;this._legacyCanvasSize=e.DEFAULT_CANVAS_SIZE;this._preferredFacingMode=f;this._flashOn=this._paused=this._active=!1;"number"===typeof c?(this._legacyCanvasSize=
c,console.warn("You're using a deprecated version of the QrScanner constructor which will be removed in the future")):this._onDecodeError=c;"number"===typeof d?(this._legacyCanvasSize=d,console.warn("You're using a deprecated version of the QrScanner constructor which will be removed in the future")):this._calculateScanRegion=d;this._scanRegion=this._calculateScanRegion(a);this._onPlay=this._onPlay.bind(this);this._onLoadedMetaData=this._onLoadedMetaData.bind(this);this._onVisibilityChange=this._onVisibilityChange.bind(this);
this.$video.playsInline=!0;this.$video.muted=!0;this.$video.disablePictureInPicture=!0;this.$video.addEventListener("play",this._onPlay);this.$video.addEventListener("loadedmetadata",this._onLoadedMetaData);document.addEventListener("visibilitychange",this._onVisibilityChange);this._qrEnginePromise=e.createQrEngine()}hasFlash(){if(!("ImageCapture"in window))return Promise.resolve(!1);let a=this.$video.srcObject?this.$video.srcObject.getVideoTracks()[0]:null;return a?(new ImageCapture(a)).getPhotoCapabilities().then(a=>
a.fillLightMode.includes("flash")).catch(a=>{console.warn(a);return!1}):Promise.reject("Camera not started or not available")}isFlashOn(){return this._flashOn}toggleFlash(){return this._setFlash(!this._flashOn)}turnFlashOff(){return this._setFlash(!1)}turnFlashOn(){return this._setFlash(!0)}destroy(){this.$video.removeEventListener("loadedmetadata",this._onLoadedMetaData);this.$video.removeEventListener("play",this._onPlay);document.removeEventListener("visibilitychange",this._onVisibilityChange);
this.stop();e._postWorkerMessage(this._qrEnginePromise,"close")}start(){if(this._active&&!this._paused)return Promise.resolve();"https:"!==window.location.protocol&&console.warn("The camera stream is only accessible if the page is transferred via https.");this._active=!0;this._paused=!1;if(document.hidden)return Promise.resolve();clearTimeout(this._offTimeout);this._offTimeout=null;if(this.$video.srcObject)return this.$video.play(),Promise.resolve();let a=this._preferredFacingMode;return this._getCameraStream(a,
!0).catch(()=>{a="environment"===a?"user":"environment";return this._getCameraStream()}).then(b=>{a=this._getFacingMode(b)||a;this.$video.srcObject=b;this.$video.play();this._setVideoMirror(a)}).catch(a=>{this._active=!1;throw a;})}stop(){this.pause();this._active=!1}pause(){this._paused=!0;this._active&&(this.$video.pause(),this._offTimeout||(this._offTimeout=setTimeout(()=>{let a=this.$video.srcObject?this.$video.srcObject.getTracks():[];for(let b of a)b.stop();this._offTimeout=this.$video.srcObject=
null},300)))}static scanImage(a,b=null,c=null,d=null,f=!1,k=!1){let h=c instanceof Worker,g=Promise.all([c||e.createQrEngine(),e._loadImage(a)]).then(([a,g])=>{c=a;let k;[d,k]=this._drawToCanvas(g,b,d,f);return c instanceof Worker?(h||c.postMessage({type:"inversionMode",data:"both"}),new Promise((a,b)=>{let f,l,g;l=d=>{"qrResult"===d.data.type&&(c.removeEventListener("message",l),c.removeEventListener("error",g),clearTimeout(f),null!==d.data.data?a(d.data.data):b(e.NO_QR_CODE_FOUND))};g=a=>{c.removeEventListener("message",
l);c.removeEventListener("error",g);clearTimeout(f);b("Scanner error: "+(a?a.message||a:"Unknown Error"))};c.addEventListener("message",l);c.addEventListener("error",g);f=setTimeout(()=>g("timeout"),1E4);let h=k.getImageData(0,0,d.width,d.height);c.postMessage({type:"decode",data:h},[h.data.buffer])})):new Promise((a,b)=>{let f=setTimeout(()=>b("Scanner error: timeout"),1E4);c.detect(d).then(c=>{c.length?a(c[0].rawValue):b(e.NO_QR_CODE_FOUND)}).catch(a=>b("Scanner error: "+(a.message||a))).finally(()=>
clearTimeout(f))})});b&&k&&(g=g.catch(()=>e.scanImage(a,null,c,d,f)));return g=g.finally(()=>{h||e._postWorkerMessage(c,"close")})}setGrayscaleWeights(a,b,c,d=!0){e._postWorkerMessage(this._qrEnginePromise,"grayscaleWeights",{red:a,green:b,blue:c,useIntegerApproximation:d})}setInversionMode(a){e._postWorkerMessage(this._qrEnginePromise,"inversionMode",a)}static createQrEngine(a=e.WORKER_PATH){return("BarcodeDetector"in window?BarcodeDetector.getSupportedFormats():Promise.resolve([])).then(b=>-1!==
b.indexOf("qr_code")?new BarcodeDetector({formats:["qr_code"]}):new Worker(a))}_onPlay(){this._scanRegion=this._calculateScanRegion(this.$video);this._scanFrame()}_onLoadedMetaData(){this._scanRegion=this._calculateScanRegion(this.$video)}_onVisibilityChange(){document.hidden?this.pause():this._active&&this.start()}_calculateScanRegion(a){let b=Math.round(2/3*Math.min(a.videoWidth,a.videoHeight));return{x:(a.videoWidth-b)/2,y:(a.videoHeight-b)/2,width:b,height:b,downScaledWidth:this._legacyCanvasSize,
downScaledHeight:this._legacyCanvasSize}}_scanFrame(){if(!this._active||this.$video.paused||this.$video.ended)return!1;requestAnimationFrame(()=>{1>=this.$video.readyState?this._scanFrame():this._qrEnginePromise.then(a=>e.scanImage(this.$video,this._scanRegion,a,this.$canvas)).then(this._onDecode,a=>{this._active&&(-1!==(a.message||a).indexOf("service unavailable")&&(this._qrEnginePromise=e.createQrEngine()),this._onDecodeError(a))}).then(()=>this._scanFrame())})}_onDecodeError(a){a!==e.NO_QR_CODE_FOUND&&
console.log(a)}_getCameraStream(a,b=!1){let c=[{width:{min:1024}},{width:{min:768}},{}];a&&(b&&(a={exact:a}),c.forEach(b=>b.facingMode=a));return this._getMatchingCameraStream(c)}_getMatchingCameraStream(a){return navigator.mediaDevices&&0!==a.length?navigator.mediaDevices.getUserMedia({video:a.shift()}).catch(()=>this._getMatchingCameraStream(a)):Promise.reject("Camera not found.")}_setFlash(a){return this.hasFlash().then(b=>b?this.$video.srcObject.getVideoTracks()[0].applyConstraints({advanced:[{torch:a}]}):
Promise.reject("No flash available")).then(()=>this._flashOn=a)}_setVideoMirror(a){this.$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=null,c=null,d=!1){c=c||document.createElement("canvas");let f=b&&b.x?b.x:0,k=b&&b.y?b.y:0,h=b&&b.width?b.width:a.width||a.videoWidth,g=b&&b.height?b.height:a.height||a.videoHeight;
d||(c.width=b&&b.downScaledWidth?b.downScaledWidth:h,c.height=b&&b.downScaledHeight?b.downScaledHeight:g);b=c.getContext("2d",{alpha:!1});b.imageSmoothingEnabled=!1;b.drawImage(a,f,k,h,g,0,0,c.width,c.height);return[c,b]}static _loadImage(a){if(a instanceof HTMLCanvasElement||a instanceof HTMLVideoElement||window.ImageBitmap&&a instanceof window.ImageBitmap||window.OffscreenCanvas&&a instanceof window.OffscreenCanvas)return Promise.resolve(a);if(a instanceof Image)return e._awaitImageLoad(a).then(()=>
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;return e._awaitImageLoad(b).then(()=>{(a instanceof File||a instanceof Blob)&&URL.revokeObjectURL(b.src);return b})}return Promise.reject("Unsupported image type.")}static _awaitImageLoad(a){return new Promise((b,c)=>{if(a.complete&&0!==a.naturalWidth)b();else{let d,f;d=()=>{a.removeEventListener("load",d);a.removeEventListener("error",
f);b()};f=()=>{a.removeEventListener("load",d);a.removeEventListener("error",f);c("Image load error")};a.addEventListener("load",d);a.addEventListener("error",f)}})}static _postWorkerMessage(a,b,c){return Promise.resolve(a).then(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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