qr-scanner.umd.min.js.map

{"version":3,"file":"qr-scanner.umd.min.js","sources":["src/qr-scanner.js"],"sourcesContent":["export default class QrScanner {\n    /* async */\n    static hasCamera() {\n        if (!navigator.mediaDevices) return Promise.resolve(false);\n        // note that enumerateDevices can always be called and does not prompt the user for permission. However, device\n        // labels are only readable if served via https and an active media stream exists or permanent permission is\n        // given. That doesn't matter for us though as we don't require labels.\n        return navigator.mediaDevices.enumerateDevices()\n            .then(devices => devices.some(device => device.kind === 'videoinput'))\n            .catch(() => false);\n    }\n\n    constructor(\n        video,\n        onDecode,\n        canvasSizeOrOnDecodeError = this._onDecodeError,\n        canvasSizeOrCalculateScanRegion = this._calculateScanRegion,\n        preferredFacingMode = 'environment'\n    ) {\n        this.$video = video;\n        this.$canvas = document.createElement('canvas');\n        this._onDecode = onDecode;\n        this._legacyCanvasSize = QrScanner.DEFAULT_CANVAS_SIZE;\n        this._preferredFacingMode = preferredFacingMode;\n        this._active = false;\n        this._paused = false;\n        this._flashOn = false;\n\n        if (typeof canvasSizeOrOnDecodeError === 'number') {\n            // legacy function signature where the third argument is the canvas size\n            this._legacyCanvasSize = canvasSizeOrOnDecodeError;\n            console.warn('You\\'re using a deprecated version of the QrScanner constructor which will be removed in '\n                + 'the future');\n        } else {\n            this._onDecodeError = canvasSizeOrOnDecodeError;\n        }\n\n        if (typeof canvasSizeOrCalculateScanRegion === 'number') {\n            // legacy function signature where the fourth argument is the canvas size\n            this._legacyCanvasSize = canvasSizeOrCalculateScanRegion;\n            console.warn('You\\'re using a deprecated version of the QrScanner constructor which will be removed in '\n                + 'the future');\n        } else {\n            this._calculateScanRegion = canvasSizeOrCalculateScanRegion;\n        }\n\n        this._scanRegion = this._calculateScanRegion(video);\n\n        this._onPlay = this._onPlay.bind(this);\n        this._onLoadedMetaData = this._onLoadedMetaData.bind(this);\n        this._onVisibilityChange = this._onVisibilityChange.bind(this);\n\n        // Allow inline playback on iPhone instead of requiring full screen playback,\n        // see https://webkit.org/blog/6784/new-video-policies-for-ios/\n        this.$video.playsInline = true;\n        // Allow play() on iPhone without requiring a user gesture. Should not really be needed as camera stream\n        // includes no audio, but just to be safe.\n        this.$video.muted = true;\n        this.$video.disablePictureInPicture = true;\n        this.$video.addEventListener('play', this._onPlay);\n        this.$video.addEventListener('loadedmetadata', this._onLoadedMetaData);\n        document.addEventListener('visibilitychange', this._onVisibilityChange);\n\n        this._qrEnginePromise = QrScanner.createQrEngine();\n    }\n\n    /* async */\n    hasFlash() {\n        if (!('ImageCapture' in window)) {\n            return Promise.resolve(false);\n        }\n\n        const track = this.$video.srcObject ? this.$video.srcObject.getVideoTracks()[0] : null;\n        if (!track) {\n            return Promise.reject('Camera not started or not available');\n        }\n\n        const imageCapture = new ImageCapture(track);\n        return imageCapture.getPhotoCapabilities()\n            .then((result) => {\n                return result.fillLightMode.includes('flash');\n            })\n            .catch((error) => {\n                console.warn(error);\n                return false;\n            });\n    }\n\n    isFlashOn() {\n      return this._flashOn;\n    }\n\n    /* async */\n    toggleFlash() {\n      return this._setFlash(!this._flashOn);\n    }\n\n    /* async */\n    turnFlashOff() {\n      return this._setFlash(false);\n    }\n\n    /* async */\n    turnFlashOn() {\n      return this._setFlash(true);\n    }\n\n    destroy() {\n        this.$video.removeEventListener('loadedmetadata', this._onLoadedMetaData);\n        this.$video.removeEventListener('play', this._onPlay);\n        document.removeEventListener('visibilitychange', this._onVisibilityChange);\n\n        this.stop();\n        QrScanner._postWorkerMessage(this._qrEnginePromise, 'close');\n    }\n\n    /* async */\n    start() {\n        if (this._active && !this._paused) {\n            return Promise.resolve();\n        }\n        if (window.location.protocol !== 'https:') {\n            // warn but try starting the camera anyways\n            console.warn('The camera stream is only accessible if the page is transferred via https.');\n        }\n        this._active = true;\n        this._paused = false;\n        if (document.hidden) {\n            // camera will be started as soon as tab is in foreground\n            return Promise.resolve();\n        }\n        clearTimeout(this._offTimeout);\n        this._offTimeout = null;\n        if (this.$video.srcObject) {\n            // camera stream already/still set\n            this.$video.play();\n            return Promise.resolve();\n        }\n\n        let facingMode = this._preferredFacingMode;\n        return this._getCameraStream(facingMode, true)\n            .catch(() => {\n                // We (probably) don't have a camera of the requested facing mode\n                facingMode = facingMode === 'environment' ? 'user' : 'environment';\n                return this._getCameraStream(); // throws if camera is not accessible (e.g. due to not https)\n            })\n            .then(stream => {\n                // Try to determine the facing mode from the stream, otherwise use our guess. Note that the guess is not\n                // always accurate as Safari returns cameras of different facing mode, even for exact constraints.\n                facingMode = this._getFacingMode(stream) || facingMode;\n                this.$video.srcObject = stream;\n                this.$video.play();\n                this._setVideoMirror(facingMode);\n            })\n            .catch(e => {\n                this._active = false;\n                throw e;\n            });\n    }\n\n    stop() {\n        this.pause();\n        this._active = false;\n    }\n\n    pause() {\n        this._paused = true;\n        if (!this._active) {\n            return;\n        }\n        this.$video.pause();\n        if (this._offTimeout) {\n            return;\n        }\n        this._offTimeout = setTimeout(() => {\n            const tracks = this.$video.srcObject ? this.$video.srcObject.getTracks() : [];\n            for (const track of tracks) {\n                track.stop(); //  note that this will also automatically turn the flashlight off\n            }\n            this.$video.srcObject = null;\n            this._offTimeout = null;\n        }, 300);\n    }\n\n    /* async */\n    static scanImage(imageOrFileOrUrl, scanRegion=null, qrEngine=null, canvas=null, fixedCanvasSize=false,\n                     alsoTryWithoutScanRegion=false) {\n        const gotExternalWorker = qrEngine instanceof Worker;\n\n        let promise = Promise.all([\n            qrEngine || QrScanner.createQrEngine(),\n            QrScanner._loadImage(imageOrFileOrUrl),\n        ]).then(([engine, image]) => {\n            qrEngine = engine;\n            let canvasContext;\n            [canvas, canvasContext] = this._drawToCanvas(image, scanRegion, canvas, fixedCanvasSize);\n\n            if (qrEngine instanceof Worker) {\n                if (!gotExternalWorker) {\n                    // Enable scanning of inverted color qr codes. Not using _postWorkerMessage as it's async\n                    qrEngine.postMessage({ type: 'inversionMode', data: 'both' });\n                }\n                return new Promise((resolve, reject) => {\n                    let timeout, onMessage, onError;\n                    onMessage = event => {\n                        if (event.data.type !== 'qrResult') {\n                            return;\n                        }\n                        qrEngine.removeEventListener('message', onMessage);\n                        qrEngine.removeEventListener('error', onError);\n                        clearTimeout(timeout);\n                        if (event.data.data !== null) {\n                            resolve(event.data.data);\n                        } else {\n                            reject(QrScanner.NO_QR_CODE_FOUND);\n                        }\n                    };\n                    onError = (e) => {\n                        qrEngine.removeEventListener('message', onMessage);\n                        qrEngine.removeEventListener('error', onError);\n                        clearTimeout(timeout);\n                        const errorMessage = !e ? 'Unknown Error' : (e.message || e);\n                        reject('Scanner error: ' + errorMessage);\n                    };\n                    qrEngine.addEventListener('message', onMessage);\n                    qrEngine.addEventListener('error', onError);\n                    timeout = setTimeout(() => onError('timeout'), 10000);\n                    const imageData = canvasContext.getImageData(0, 0, canvas.width, canvas.height);\n                    qrEngine.postMessage({\n                        type: 'decode',\n                        data: imageData\n                    }, [imageData.data.buffer]);\n                });\n            } else {\n                return new Promise((resolve, reject) => {\n                    const timeout = setTimeout(() => reject('Scanner error: timeout'), 10000);\n                    qrEngine.detect(canvas).then(scanResults => {\n                        if (!scanResults.length) {\n                            reject(QrScanner.NO_QR_CODE_FOUND);\n                        } else {\n                            resolve(scanResults[0].rawValue);\n                        }\n                    }).catch((e) => reject('Scanner error: ' + (e.message || e))).finally(() => clearTimeout(timeout));\n                });\n            }\n        });\n\n        if (scanRegion && alsoTryWithoutScanRegion) {\n            promise = promise.catch(() => QrScanner.scanImage(imageOrFileOrUrl, null, qrEngine, canvas, fixedCanvasSize));\n        }\n\n        promise = promise.finally(() => {\n            if (gotExternalWorker) return;\n            QrScanner._postWorkerMessage(qrEngine, 'close');\n        });\n\n        return promise;\n    }\n\n    setGrayscaleWeights(red, green, blue, useIntegerApproximation = true) {\n        // Note that for the native BarcodeDecoder, this is a no-op. However, the native implementations work also\n        // well with colored qr codes.\n        QrScanner._postWorkerMessage(\n            this._qrEnginePromise,\n            'grayscaleWeights',\n            { red, green, blue, useIntegerApproximation }\n        );\n    }\n\n    setInversionMode(inversionMode) {\n        // Note that for the native BarcodeDecoder, this is a no-op. However, the native implementations scan normal\n        // and inverted qr codes by default\n        QrScanner._postWorkerMessage(this._qrEnginePromise, 'inversionMode', inversionMode);\n    }\n\n    /* async */\n    static createQrEngine(workerPath = QrScanner.WORKER_PATH) {\n        return ('BarcodeDetector' in window ? BarcodeDetector.getSupportedFormats() : Promise.resolve([]))\n            .then((supportedFormats) => supportedFormats.indexOf('qr_code') !== -1\n                ? new BarcodeDetector({ formats: ['qr_code'] })\n                : new Worker(workerPath)\n            );\n    }\n\n    _onPlay() {\n        this._scanRegion = this._calculateScanRegion(this.$video);\n        this._scanFrame();\n    }\n\n    _onLoadedMetaData() {\n        this._scanRegion = this._calculateScanRegion(this.$video);\n    }\n\n    _onVisibilityChange() {\n        if (document.hidden) {\n            this.pause();\n        } else if (this._active) {\n            this.start();\n        }\n    }\n\n    _calculateScanRegion(video) {\n        // Default scan region calculation. Note that this can be overwritten in the constructor.\n        const smallestDimension = Math.min(video.videoWidth, video.videoHeight);\n        const scanRegionSize = Math.round(2 / 3 * smallestDimension);\n        return {\n            x: (video.videoWidth - scanRegionSize) / 2,\n            y: (video.videoHeight - scanRegionSize) / 2,\n            width: scanRegionSize,\n            height: scanRegionSize,\n            downScaledWidth: this._legacyCanvasSize,\n            downScaledHeight: this._legacyCanvasSize,\n        };\n    }\n\n    _scanFrame() {\n        if (!this._active || this.$video.paused || this.$video.ended) return false;\n        // using requestAnimationFrame to avoid scanning if tab is in background\n        requestAnimationFrame(() => {\n            if (this.$video.readyState <= 1) {\n                // Skip scans until the video is ready as drawImage() only works correctly on a video with readyState\n                // > 1, see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/drawImage#Notes.\n                // This also avoids false positives for videos paused after a successful scan which remains visible on\n                // the canvas until the video is started again and ready.\n                this._scanFrame();\n                return;\n            }\n            this._qrEnginePromise\n                .then((qrEngine) => QrScanner.scanImage(this.$video, this._scanRegion, qrEngine, this.$canvas))\n                .then(this._onDecode, (error) => {\n                    if (!this._active) return;\n                    const errorMessage = error.message || error;\n                    if (errorMessage.indexOf('service unavailable') !== -1) {\n                        // When the native BarcodeDetector crashed, create a new one\n                        this._qrEnginePromise = QrScanner.createQrEngine();\n                    }\n                    this._onDecodeError(error);\n                })\n                .then(() => this._scanFrame());\n        });\n    }\n\n    _onDecodeError(error) {\n        // default error handler; can be overwritten in the constructor\n        if (error === QrScanner.NO_QR_CODE_FOUND) return;\n        console.log(error);\n    }\n\n    _getCameraStream(facingMode, exact = false) {\n        const constraintsToTry = [{\n            width: { min: 1024 }\n        }, {\n            width: { min: 768 }\n        }, {}];\n\n        if (facingMode) {\n            if (exact) {\n                facingMode = { exact: facingMode };\n            }\n            constraintsToTry.forEach(constraint => constraint.facingMode = facingMode);\n        }\n        return this._getMatchingCameraStream(constraintsToTry);\n    }\n\n    _getMatchingCameraStream(constraintsToTry) {\n        if (!navigator.mediaDevices || constraintsToTry.length === 0) {\n            return Promise.reject('Camera not found.');\n        }\n        return navigator.mediaDevices.getUserMedia({\n            video: constraintsToTry.shift()\n        }).catch(() => this._getMatchingCameraStream(constraintsToTry));\n    }\n\n    /* async */\n    _setFlash(on) {\n        return this.hasFlash().then((hasFlash) => {\n            if (!hasFlash) return Promise.reject('No flash available');\n            // Note that the video track is guaranteed to exist at this point\n            return this.$video.srcObject.getVideoTracks()[0].applyConstraints({\n                advanced: [{ torch: on }],\n            });\n        }).then(() => this._flashOn = on);\n    }\n\n    _setVideoMirror(facingMode) {\n        // in user facing mode mirror the video to make it easier for the user to position the QR code\n        const scaleFactor = facingMode==='user'? -1 : 1;\n        this.$video.style.transform = 'scaleX(' + scaleFactor + ')';\n    }\n\n    _getFacingMode(videoStream) {\n        const videoTrack = videoStream.getVideoTracks()[0];\n        if (!videoTrack) return null; // unknown\n        // inspired by https://github.com/JodusNodus/react-qr-reader/blob/master/src/getDeviceId.js#L13\n        return /rear|back|environment/i.test(videoTrack.label)\n            ? 'environment'\n            : /front|user|face/i.test(videoTrack.label)\n                ? 'user'\n                : null; // unknown\n    }\n\n    static _drawToCanvas(image, scanRegion=null, canvas=null, fixedCanvasSize=false) {\n        canvas = canvas || document.createElement('canvas');\n        const scanRegionX = scanRegion && scanRegion.x? scanRegion.x : 0;\n        const scanRegionY = scanRegion && scanRegion.y? scanRegion.y : 0;\n        const scanRegionWidth = scanRegion && scanRegion.width? scanRegion.width : image.width || image.videoWidth;\n        const scanRegionHeight = scanRegion && scanRegion.height? scanRegion.height : image.height || image.videoHeight;\n        if (!fixedCanvasSize) {\n            canvas.width = scanRegion && scanRegion.downScaledWidth? scanRegion.downScaledWidth : scanRegionWidth;\n            canvas.height = scanRegion && scanRegion.downScaledHeight? scanRegion.downScaledHeight : scanRegionHeight;\n        }\n        const context = canvas.getContext('2d', { alpha: false });\n        context.imageSmoothingEnabled = false; // gives less blurry images\n        context.drawImage(\n            image,\n            scanRegionX, scanRegionY, scanRegionWidth, scanRegionHeight,\n            0, 0, canvas.width, canvas.height\n        );\n        return [canvas, context];\n    }\n\n    /* async */\n    static _loadImage(imageOrFileOrBlobOrUrl) {\n        if (imageOrFileOrBlobOrUrl instanceof HTMLCanvasElement || imageOrFileOrBlobOrUrl instanceof HTMLVideoElement\n            || window.ImageBitmap && imageOrFileOrBlobOrUrl instanceof window.ImageBitmap\n            || window.OffscreenCanvas && imageOrFileOrBlobOrUrl instanceof window.OffscreenCanvas) {\n            return Promise.resolve(imageOrFileOrBlobOrUrl);\n        } else if (imageOrFileOrBlobOrUrl instanceof Image) {\n            return QrScanner._awaitImageLoad(imageOrFileOrBlobOrUrl).then(() => imageOrFileOrBlobOrUrl);\n        } else if (imageOrFileOrBlobOrUrl instanceof File || imageOrFileOrBlobOrUrl instanceof Blob\n            || imageOrFileOrBlobOrUrl instanceof URL || typeof(imageOrFileOrBlobOrUrl)==='string') {\n            const image = new Image();\n            if (imageOrFileOrBlobOrUrl instanceof File || imageOrFileOrBlobOrUrl instanceof Blob) {\n                image.src = URL.createObjectURL(imageOrFileOrBlobOrUrl);\n            } else {\n                image.src = imageOrFileOrBlobOrUrl;\n            }\n            return QrScanner._awaitImageLoad(image).then(() => {\n                if (imageOrFileOrBlobOrUrl instanceof File || imageOrFileOrBlobOrUrl instanceof Blob) {\n                    URL.revokeObjectURL(image.src);\n                }\n                return image;\n            });\n        } else {\n            return Promise.reject('Unsupported image type.');\n        }\n    }\n\n    /* async */\n    static _awaitImageLoad(image) {\n        return new Promise((resolve, reject) => {\n            if (image.complete && image.naturalWidth!==0) {\n                // already loaded\n                resolve();\n            } else 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