qr-scanner.min.js

class f{static hasCamera(){return f.listCameras(!1).then(a=>!!a.length).catch(()=>!1)}static listCameras(a=!1){if(!navigator.mediaDevices)return Promise.resolve([]);let b=null;return(a?navigator.mediaDevices.getUserMedia({audio:!1,video:!0}).then(a=>b=a).catch(()=>{}):Promise.resolve()).then(()=>navigator.mediaDevices.enumerateDevices()).then(a=>a.filter(a=>"videoinput"===a.kind).map((a,b)=>({id:a.deviceId,label:a.label||(0===b?"Default Camera":`Camera ${b+1}`)}))).finally(()=>{if(b)for(let a of b.getTracks())a.stop(),
b.removeTrack(a)})}constructor(a,b,c=this._onDecodeError,d=this._calculateScanRegion,g="environment"){this.$video=a;this.$canvas=document.createElement("canvas");this._onDecode=b;this._legacyCanvasSize=f.DEFAULT_CANVAS_SIZE;this._preferredCamera=g;this._flashOn=this._paused=this._active=!1;"number"===typeof c?(this._legacyCanvasSize=c,console.warn("You're using a deprecated version of the QrScanner constructor which will be removed in the future")):this._onDecodeError=c;"number"===typeof d?(this._legacyCanvasSize=
d,console.warn("You're using a deprecated version of the QrScanner constructor which will be removed in the future")):this._calculateScanRegion=d;this._scanRegion=this._calculateScanRegion(a);this._onPlay=this._onPlay.bind(this);this._onLoadedMetaData=this._onLoadedMetaData.bind(this);this._onVisibilityChange=this._onVisibilityChange.bind(this);a.disablePictureInPicture=!0;a.playsInline=!0;a.muted=!0;let h=!1;a.hidden&&(a.hidden=!1,h=!0);document.body.contains(a)||(document.body.appendChild(a),h=
!0);requestAnimationFrame(()=>{let b=window.getComputedStyle(a);"none"===b.display&&(a.style.setProperty("display","block","important"),h=!0);"visible"!==b.visibility&&(a.style.setProperty("visibility","visible","important"),h=!0);h&&(console.warn("QrScanner has overwritten the video hiding style to avoid Safari stopping the playback."),a.style.opacity=0,a.style.width=0,a.style.height=0)});a.addEventListener("play",this._onPlay);a.addEventListener("loadedmetadata",this._onLoadedMetaData);document.addEventListener("visibilitychange",
this._onVisibilityChange);this._qrEnginePromise=f.createQrEngine()}hasFlash(){let a=null;return(this.$video.srcObject?Promise.resolve(this.$video.srcObject.getVideoTracks()[0]):this._getCameraStream().then(({stream:b})=>{console.warn("Call hasFlash after successfully starting the scanner to avoid creating a temporary video stream");a=b;return b.getVideoTracks()[0]})).then(a=>"torch"in a.getSettings()).catch(()=>!1).finally(()=>{if(a)for(let b of a.getTracks())b.stop(),a.removeTrack(b)})}isFlashOn(){return this._flashOn}toggleFlash(){return this._flashOn?
this.turnFlashOff():this.turnFlashOn()}turnFlashOn(){if(this._flashOn)return Promise.resolve();this._flashOn=!0;return!this._active||this._paused?Promise.resolve():this.hasFlash().then(a=>a?this.$video.srcObject.getVideoTracks()[0].applyConstraints({advanced:[{torch:!0}]}):Promise.reject("No flash available")).catch(()=>{this._flashOn=!1;throw e;})}turnFlashOff(){if(this._flashOn)return this._flashOn=!1,this._restartVideoStream()}destroy(){this.$video.removeEventListener("loadedmetadata",this._onLoadedMetaData);
this.$video.removeEventListener("play",this._onPlay);document.removeEventListener("visibilitychange",this._onVisibilityChange);this.stop();f._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;if(document.hidden)return Promise.resolve();this._paused=!1;return this.$video.srcObject?(this.$video.play(),
Promise.resolve()):this._getCameraStream().then(({stream:a,facingMode:b})=>{this.$video.srcObject=a;this.$video.play();this._setVideoMirror(b);this._flashOn&&(this._flashOn=!1,this.turnFlashOn().catch(()=>{}))}).catch(a=>{this._active=!1;throw a;})}stop(){this.pause();this._active=!1}pause(a=!1){this._paused=!0;if(!this._active)return Promise.resolve(!0);this.$video.pause();let b=()=>{const a=this.$video.srcObject?this.$video.srcObject.getTracks():[];for(const b of a)b.stop(),this.$video.srcObject.removeTrack(b);
this.$video.srcObject=null};return a?(b(),Promise.resolve(!0)):(new Promise(a=>setTimeout(a,300))).then(()=>{if(!this._paused)return!1;b();return!0})}setCamera(a){if(a===this._preferredCamera)return Promise.resolve();this._preferredCamera=a;return this._restartVideoStream()}static scanImage(a,b=null,c=null,d=null,g=!1,h=!1){let k=c instanceof Worker,l=Promise.all([c||f.createQrEngine(),f._loadImage(a)]).then(([a,h])=>{c=a;let l;[d,l]=this._drawToCanvas(h,b,d,g);return c instanceof Worker?(k||c.postMessage({type:"inversionMode",
data:"both"}),new Promise((a,b)=>{let g,h,k;h=d=>{"qrResult"===d.data.type&&(c.removeEventListener("message",h),c.removeEventListener("error",k),clearTimeout(g),null!==d.data.data?a(d.data.data):b(f.NO_QR_CODE_FOUND))};k=a=>{c.removeEventListener("message",h);c.removeEventListener("error",k);clearTimeout(g);b("Scanner error: "+(a?a.message||a:"Unknown Error"))};c.addEventListener("message",h);c.addEventListener("error",k);g=setTimeout(()=>k("timeout"),1E4);let m=l.getImageData(0,0,d.width,d.height);
c.postMessage({type:"decode",data:m},[m.data.buffer])})):new Promise((a,b)=>{let g=setTimeout(()=>b("Scanner error: timeout"),1E4);c.detect(d).then(c=>{c.length?a(c[0].rawValue):b(f.NO_QR_CODE_FOUND)}).catch(a=>b("Scanner error: "+(a.message||a))).finally(()=>clearTimeout(g))})});b&&h&&(l=l.catch(()=>f.scanImage(a,null,c,d,g)));return l=l.finally(()=>{k||f._postWorkerMessage(c,"close")})}setGrayscaleWeights(a,b,c,d=!0){f._postWorkerMessage(this._qrEnginePromise,"grayscaleWeights",{red:a,green:b,blue:c,
useIntegerApproximation:d})}setInversionMode(a){f._postWorkerMessage(this._qrEnginePromise,"inversionMode",a)}static createQrEngine(a=f.WORKER_PATH){return("BarcodeDetector"in window&&BarcodeDetector.getSupportedFormats?BarcodeDetector.getSupportedFormats():Promise.resolve([])).then(b=>-1!==b.indexOf("qr_code")?new BarcodeDetector({formats:["qr_code"]}):new Worker(a))}_onPlay(){this._scanRegion=this._calculateScanRegion(this.$video);this._scanFrame()}_onLoadedMetaData(){this._scanRegion=this._calculateScanRegion(this.$video)}_onVisibilityChange(){document.hidden?
this.pause():this._active&&this.start()}_calculateScanRegion(a){let b=Math.round(2/3*Math.min(a.videoWidth,a.videoHeight));return{x:Math.round((a.videoWidth-b)/2),y:Math.round((a.videoHeight-b)/2),width:b,height:b,downScaledWidth:this._legacyCanvasSize,downScaledHeight:this._legacyCanvasSize}}_scanFrame(){if(!this._active||this.$video.paused||this.$video.ended)return!1;requestAnimationFrame(()=>{1>=this.$video.readyState?this._scanFrame():this._qrEnginePromise.then(a=>f.scanImage(this.$video,this._scanRegion,
a,this.$canvas)).then(this._onDecode,a=>{this._active&&(-1!==(a.message||a).indexOf("service unavailable")&&(this._qrEnginePromise=f.createQrEngine()),this._onDecodeError(a))}).then(()=>this._scanFrame())})}_onDecodeError(a){a!==f.NO_QR_CODE_FOUND&&console.log(a)}_getCameraStream(){if(!navigator.mediaDevices)return Promise.reject("Camera not found.");let a="environment"===this._preferredCamera||"user"===this._preferredCamera?"facingMode":"deviceId",b=[{width:{min:1024}},{width:{min:768}},{}];return[...b.map(b=>
Object.assign({},b,{[a]:{exact:this._preferredCamera}})),...b].reduceRight((a,b)=>()=>navigator.mediaDevices.getUserMedia({video:b,audio:!1}).then(a=>({stream:a,facingMode:this._getFacingMode(a)||(b.facingMode?this._preferredCamera:"environment"===this._preferredCamera?"user":"environment")})).catch(a),()=>Promise.reject("Camera not found."))()}_restartVideoStream(){let a=this._paused;return this.pause(!0).then(b=>{if(b&&!a&&this._active)return this.start()})}_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 g=b&&b.x?b.x:0,h=b&&b.y?b.y:0,k=b&&b.width?b.width:a.width||a.videoWidth,l=b&&b.height?b.height:a.height||a.videoHeight;d||(d=b&&b.downScaledWidth?b.downScaledWidth:k,b=b&&b.downScaledHeight?b.downScaledHeight:l,c.width!==d&&(c.width=
d),c.height!==b&&(c.height=b));b=c.getContext("2d",{alpha:!1});b.imageSmoothingEnabled=!1;b.drawImage(a,g,h,k,l,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 f._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 f._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,g;d=()=>{a.removeEventListener("load",d);a.removeEventListener("error",g);b()};g=()=>{a.removeEventListener("load",d);a.removeEventListener("error",
g);c("Image load error")};a.addEventListener("load",d);a.addEventListener("error",g)}})}static _postWorkerMessage(a,b,c){return Promise.resolve(a).then(a=>{a instanceof Worker&&a.postMessage({type:b,data:c})})}}f.DEFAULT_CANVAS_SIZE=400;f.NO_QR_CODE_FOUND="No QR code found";f.WORKER_PATH="qr-scanner-worker.min.js";export default f
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