Jose Olarte III
3 days ago
5 changed files with 447 additions and 51 deletions
@ -0,0 +1,17 @@ |
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import { EventEmitter } from "events"; |
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export interface QRScannerListener { |
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onScan: (result: string) => void; |
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onError: (error: Error) => void; |
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} |
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export interface QRScannerService { |
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checkPermissions(): Promise<boolean>; |
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requestPermissions(): Promise<boolean>; |
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isSupported(): Promise<boolean>; |
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startScan(): Promise<void>; |
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stopScan(): Promise<void>; |
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addListener(listener: QRScannerListener): void; |
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cleanup(): Promise<void>; |
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onStream(callback: (stream: MediaStream | null) => void): void; |
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} |
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@ -0,0 +1,195 @@ |
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import { QRScannerService, ScanListener, QRScannerOptions } from "./types"; |
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import { logger } from "@/utils/logger"; |
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import { EventEmitter } from "events"; |
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export class WebInlineQRScanner implements QRScannerService { |
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private scanListener: ScanListener | null = null; |
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private isScanning = false; |
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private stream: MediaStream | null = null; |
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private events = new EventEmitter(); |
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constructor(private options?: QRScannerOptions) {} |
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async checkPermissions(): Promise<boolean> { |
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try { |
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logger.log("[QRScanner] Checking camera permissions..."); |
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const permissions = await navigator.permissions.query({ |
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name: "camera" as PermissionName, |
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}); |
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logger.log("[QRScanner] Permission state:", permissions.state); |
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return permissions.state === "granted"; |
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} catch (error) { |
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logger.error("[QRScanner] Error checking camera permissions:", error); |
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return false; |
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} |
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} |
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async requestPermissions(): Promise<boolean> { |
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try { |
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// First check if we have any video devices
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const devices = await navigator.mediaDevices.enumerateDevices(); |
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const videoDevices = devices.filter( |
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(device) => device.kind === "videoinput", |
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); |
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if (videoDevices.length === 0) { |
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logger.error("No video devices found"); |
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throw new Error("No camera found on this device"); |
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} |
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// Try to get a stream with specific constraints
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const stream = await navigator.mediaDevices.getUserMedia({ |
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video: { |
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facingMode: "environment", |
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width: { ideal: 1280 }, |
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height: { ideal: 720 }, |
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}, |
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}); |
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|
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// Stop the test stream immediately
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stream.getTracks().forEach((track) => track.stop()); |
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return true; |
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} catch (error) { |
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const wrappedError = |
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error instanceof Error ? error : new Error(String(error)); |
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logger.error("Error requesting camera permissions:", { |
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error: wrappedError.message, |
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stack: wrappedError.stack, |
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name: wrappedError.name, |
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}); |
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|
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// Provide more specific error messages
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if ( |
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wrappedError.name === "NotFoundError" || |
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wrappedError.name === "DevicesNotFoundError" |
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) { |
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throw new Error("No camera found on this device"); |
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} else if ( |
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wrappedError.name === "NotAllowedError" || |
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wrappedError.name === "PermissionDeniedError" |
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) { |
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throw new Error( |
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"Camera access denied. Please grant camera permission and try again", |
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); |
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} else if ( |
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wrappedError.name === "NotReadableError" || |
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wrappedError.name === "TrackStartError" |
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) { |
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throw new Error("Camera is in use by another application"); |
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} else { |
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throw new Error(`Camera error: ${wrappedError.message}`); |
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} |
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} |
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} |
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async isSupported(): Promise<boolean> { |
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try { |
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// Check for secure context first
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if (!window.isSecureContext) { |
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logger.warn("Camera access requires HTTPS (secure context)"); |
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return false; |
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} |
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// Check for camera API support
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if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) { |
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logger.warn("Camera API not supported in this browser"); |
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return false; |
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} |
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|
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// Check if we have any video devices
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const devices = await navigator.mediaDevices.enumerateDevices(); |
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const hasVideoDevices = devices.some( |
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(device) => device.kind === "videoinput", |
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); |
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|
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if (!hasVideoDevices) { |
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logger.warn("No video devices found"); |
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return false; |
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} |
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return true; |
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} catch (error) { |
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logger.error("Error checking camera support:", { |
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error: error instanceof Error ? error.message : String(error), |
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stack: error instanceof Error ? error.stack : undefined, |
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}); |
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return false; |
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} |
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} |
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async startScan(): Promise<void> { |
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if (this.isScanning) { |
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return; |
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} |
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|
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try { |
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this.isScanning = true; |
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logger.log("[WebInlineQRScanner] Starting scan"); |
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// Get camera stream
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this.stream = await navigator.mediaDevices.getUserMedia({ |
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video: { |
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facingMode: "environment", |
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width: { ideal: 1280 }, |
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height: { ideal: 720 }, |
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}, |
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}); |
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// Emit stream to component
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this.events.emit("stream", this.stream); |
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} catch (error) { |
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this.isScanning = false; |
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const wrappedError = |
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error instanceof Error ? error : new Error(String(error)); |
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if (this.scanListener?.onError) { |
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this.scanListener.onError(wrappedError); |
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} |
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logger.error("Error starting scan:", wrappedError); |
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throw wrappedError; |
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} |
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} |
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async stopScan(): Promise<void> { |
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if (!this.isScanning) { |
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return; |
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} |
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try { |
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logger.log("[WebInlineQRScanner] Stopping scan"); |
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// Stop all tracks in the stream
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if (this.stream) { |
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this.stream.getTracks().forEach(track => track.stop()); |
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this.stream = null; |
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} |
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// Emit stream stopped event
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this.events.emit("stream", null); |
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} catch (error) { |
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const wrappedError = |
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error instanceof Error ? error : new Error(String(error)); |
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logger.error("Error stopping scan:", wrappedError); |
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throw wrappedError; |
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} finally { |
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this.isScanning = false; |
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} |
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} |
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addListener(listener: ScanListener): void { |
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this.scanListener = listener; |
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} |
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// Add method to get stream events
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onStream(callback: (stream: MediaStream | null) => void): void { |
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this.events.on("stream", callback); |
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} |
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async cleanup(): Promise<void> { |
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try { |
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await this.stopScan(); |
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this.events.removeAllListeners(); |
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} catch (error) { |
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logger.error("Error during cleanup:", error); |
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} |
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} |
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} |
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