From 530ae84792a22ef4b0a355286d4beefad2031c31 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Fri, 14 Mar 2025 09:50:02 -0700
Subject: default to back camera for ios, remember camera

---
 src/lib/store.ts                   |  1 +
 src/routes/(app)/scan/+page.svelte | 86 ++++++++++++++++++++++----------------
 2 files changed, 52 insertions(+), 35 deletions(-)

diff --git a/src/lib/store.ts b/src/lib/store.ts
index 9b57b05d..c7dc9970 100644
--- a/src/lib/store.ts
+++ b/src/lib/store.ts
@@ -64,6 +64,7 @@ export const passwordPrompt = writable();
 export const eventToSign = writable();
 export const pubkey = persistLocal("pubkey");
 export const signer = persistLocal("signer");
+export const camera = persistLocal("camera");
 export const selectSigner = writable();
 export const pin = persistLocal("pin");
 export const rate = writable();
diff --git a/src/routes/(app)/scan/+page.svelte b/src/routes/(app)/scan/+page.svelte
index aab7bcaa..80047487 100644
--- a/src/routes/(app)/scan/+page.svelte
+++ b/src/routes/(app)/scan/+page.svelte
@@ -3,6 +3,7 @@
   import { goto } from "$app/navigation";
   import { onMount, onDestroy } from "svelte";
   import { BarcodeDetector } from "barcode-detector/ponyfill";
+  import { camera } from "$lib/store";
 
   let resize = () => {
     if (resizing) clearTimeout(resizing);
@@ -14,7 +15,6 @@
   let barcodeDetector;
   let scanningFrameId;
   let cameras = [];
-  let selectedCamera = "";
   let detectionResult = null; // will hold the detected QR code value
 
   // Enumerate available video input devices
@@ -22,20 +22,36 @@
     try {
       const devices = await navigator.mediaDevices.enumerateDevices();
       cameras = devices.filter((device) => device.kind === "videoinput");
-      if (!selectedCamera && cameras.length > 0) {
-        // Prefer a rear-facing camera if available
-        const envCamera = cameras.find(
-          (camera) =>
-            camera.label.toLowerCase().includes("back") ||
-            camera.label.toLowerCase().includes("env"),
-        );
-        selectedCamera = envCamera ? envCamera.deviceId : cameras[0].deviceId;
+
+      // Check if we're on an iOS device
+      const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent);
+
+      if (!$camera && cameras.length > 0) {
+        if (isIOS) {
+          // Prefer a camera labeled "back camera" (without additional qualifiers)
+          const backCamera = cameras.find(
+            (camera) =>
+              camera.label.toLowerCase().includes("back") &&
+              !camera.label.toLowerCase().includes("dual") &&
+              !camera.label.toLowerCase().includes("wide"),
+          );
+          $camera = backCamera
+            ? backCamera.deviceId
+            : cameras[0].deviceId;
+        } else {
+          // For non-iOS, default to a camera with the environment facing mode
+          const envCamera = cameras.find(
+            (camera) =>
+              camera.label.toLowerCase().includes("back") ||
+              camera.label.toLowerCase().includes("env"),
+          );
+          $camera = envCamera ? envCamera.deviceId : cameras[0].deviceId;
+        }
       }
     } catch (err) {
       console.error("Error enumerating devices:", err);
     }
   }
-
   // Start the camera stream for a given deviceId
   async function startCamera(deviceId) {
     stopCameraStream();
@@ -106,8 +122,8 @@
 
   // Handle change of camera selection
   async function onCameraChange(event) {
-    selectedCamera = event.target.value;
-    await startCamera(selectedCamera);
+    $camera = event.target.value;
+    await startCamera($camera);
     videoEl.addEventListener("loadeddata", () => {
       canvasEl.width = videoEl.videoWidth;
       canvasEl.height = videoEl.videoHeight;
@@ -118,7 +134,7 @@
   // Provide a way to restart scanning
   async function restart() {
     detectionResult = null;
-    await startCamera(selectedCamera);
+    await startCamera($camera);
     videoEl.addEventListener("loadeddata", () => {
       canvasEl.width = videoEl.videoWidth;
       canvasEl.height = videoEl.videoHeight;
@@ -129,7 +145,7 @@
   let initialize = async () => {
     barcodeDetector = new BarcodeDetector({ formats: ["qr_code"] });
     await getCameraDevices();
-    await startCamera(selectedCamera);
+    await startCamera($camera);
     videoEl.addEventListener("loadeddata", () => {
       canvasEl.width = videoEl.videoWidth;
       canvasEl.height = videoEl.videoHeight;
@@ -146,27 +162,27 @@
 <svelte:window onresize={resize} />
 <div class="flex w-full mb-4 p-4">
   <div class="mx-auto rounded-3xl space-y-5">
-      <video
-        bind:this={videoEl}
-        class="border-4 rounded-3xl border-black max-h-[calc(100vh*0.7)]"
-      ></video>
-      <canvas bind:this={canvasEl} style="display: none;"></canvas>
-      <div class="flex justify-center">
-        <button class="btn !w-auto" onclick={back}>Cancel</button>
-      </div>
-      <div>
-        <select
-          id="cameraSelect"
-          bind:value={selectedCamera}
-          onchange={onCameraChange}
-        >
-          {#each cameras as camera}
-            <option value={camera.deviceId}>
-              {camera.label || `Camera ${camera.deviceId}`}
-            </option>
-          {/each}
-        </select>
-      </div>
+    <video
+      bind:this={videoEl}
+      class="border-4 rounded-3xl border-black max-h-[calc(100vh*0.7)]"
+    ></video>
+    <canvas bind:this={canvasEl} style="display: none;"></canvas>
+    <div class="flex justify-center">
+      <button class="btn !w-auto" onclick={back}>Cancel</button>
+    </div>
+    <div>
+      <select
+        id="cameraSelect"
+        bind:value={$camera}
+        onchange={onCameraChange}
+      >
+        {#each cameras as camera}
+          <option value={camera.deviceId}>
+            {camera.label || `Camera ${camera.deviceId}`}
+          </option>
+        {/each}
+      </select>
+    </div>
   </div>
 </div>
 
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