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feat: Add camera hardware capabilities collection
Enumerate cameras via CameraManager (no permission required): - Camera ID and facing direction (front/back/external) - Sensor physical size - Supported JPEG resolutions - Available focal lengths Provides device fingerprinting without requesting camera permission. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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‎device-sdk/src/main/java/com/maxmind/device/collector/CameraCollector.kt‎

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package com.maxmind.device.collector
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import android.content.Context
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import android.graphics.ImageFormat
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import android.hardware.camera2.CameraCharacteristics
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import android.hardware.camera2.CameraManager
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import android.util.Size
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import com.maxmind.device.model.CameraInfo
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/**
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* Collects camera hardware capabilities.
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*
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* Uses CameraManager to enumerate cameras and their characteristics
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* without requiring camera permission.
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*/
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internal class CameraCollector(
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private val context: Context,
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) {
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/**
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* Collects information about all cameras on the device.
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*
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* @return List of [CameraInfo] for each available camera
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*/
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fun collect(): List<CameraInfo> {
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val cameraManager =
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context.getSystemService(Context.CAMERA_SERVICE) as? CameraManager
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?: return emptyList()
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return try {
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cameraManager.cameraIdList.mapNotNull { cameraID ->
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collectCameraInfo(cameraManager, cameraID)
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}
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} catch (
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@Suppress("TooGenericExceptionCaught", "SwallowedException")
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e: Exception,
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) {
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// CameraManager may throw on some devices
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emptyList()
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}
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}
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private fun collectCameraInfo(
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cameraManager: CameraManager,
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cameraID: String,
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): CameraInfo? =
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try {
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val characteristics = cameraManager.getCameraCharacteristics(cameraID)
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val facing =
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characteristics.get(CameraCharacteristics.LENS_FACING)
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?: CameraCharacteristics.LENS_FACING_EXTERNAL
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val physicalSize = characteristics.get(CameraCharacteristics.SENSOR_INFO_PHYSICAL_SIZE)
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val physicalSizeString = physicalSize?.let { "${it.width}x${it.height}" }
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val streamConfigMap =
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characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
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val resolutions =
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streamConfigMap
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?.getOutputSizes(ImageFormat.JPEG)
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?.map { size: Size -> "${size.width}x${size.height}" }
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?: emptyList()
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val focalLengths =
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characteristics
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.get(CameraCharacteristics.LENS_INFO_AVAILABLE_FOCAL_LENGTHS)
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?.toList()
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CameraInfo(
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cameraID = cameraID,
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facing = facing,
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sensorPhysicalSize = physicalSizeString,
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supportedResolutions = resolutions,
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focalLengths = focalLengths,
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)
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} catch (
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@Suppress("TooGenericExceptionCaught", "SwallowedException")
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e: Exception,
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) {
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// Individual camera info may fail, skip it
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null
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}
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}

‎device-sdk/src/main/java/com/maxmind/device/collector/DeviceDataCollector.kt‎

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@@ -29,6 +29,7 @@ internal class DeviceDataCollector(private val context: Context) {
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private val gpuCollector = GpuCollector()
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private val audioCollector = AudioCollector(context)
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private val sensorCollector = SensorCollector(context)
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private val cameraCollector = CameraCollector(context)
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/**
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* Collects current device data.
@@ -44,6 +45,7 @@ internal class DeviceDataCollector(private val context: Context) {
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gpu = gpuCollector.collect(),
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audio = audioCollector.collect(),
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sensors = sensorCollector.collect(),
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cameras = cameraCollector.collect(),
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installation = collectInstallationInfo(),
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locale = collectLocaleInfo(),
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// Timezone offset in minutes

‎device-sdk/src/test/java/com/maxmind/device/collector/CameraCollectorTest.kt‎

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package com.maxmind.device.collector
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import android.content.Context
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import android.graphics.ImageFormat
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import android.hardware.camera2.CameraCharacteristics
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import android.hardware.camera2.CameraManager
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import android.hardware.camera2.params.StreamConfigurationMap
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import android.util.Size
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import android.util.SizeF
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import io.mockk.every
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import io.mockk.mockk
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import org.junit.jupiter.api.Assertions.assertEquals
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import org.junit.jupiter.api.Assertions.assertNotNull
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import org.junit.jupiter.api.Assertions.assertTrue
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import org.junit.jupiter.api.BeforeEach
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import org.junit.jupiter.api.Disabled
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import org.junit.jupiter.api.Test
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/**
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* Tests for CameraCollector.
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*
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* Uses MockK to mock CameraManager and CameraCharacteristics.
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*/
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internal class CameraCollectorTest {
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private lateinit var mockContext: Context
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private lateinit var mockCameraManager: CameraManager
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private lateinit var collector: CameraCollector
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// CameraCharacteristics.LENS_FACING_* constants
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private val lensFacingBack = 1 // CameraCharacteristics.LENS_FACING_BACK
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private val lensFacingFront = 0 // CameraCharacteristics.LENS_FACING_FRONT
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@BeforeEach
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internal fun setUp() {
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mockContext = mockk(relaxed = true)
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mockCameraManager = mockk(relaxed = true)
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every { mockContext.getSystemService(Context.CAMERA_SERVICE) } returns mockCameraManager
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collector = CameraCollector(mockContext)
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}
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@Test
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@Disabled("CameraCharacteristics.LENS_FACING key is null in unit tests - use instrumented tests")
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internal fun `collect returns camera list with properties`() {
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val mockStreamMap =
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mockk<StreamConfigurationMap> {
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// ImageFormat.JPEG = 256
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every { getOutputSizes(ImageFormat.JPEG) } returns
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arrayOf(
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Size(4032, 3024),
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Size(1920, 1080),
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)
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}
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val mockCharacteristics =
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mockk<CameraCharacteristics> {
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every { get(CameraCharacteristics.LENS_FACING) } returns lensFacingBack
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every { get(CameraCharacteristics.SENSOR_INFO_PHYSICAL_SIZE) } returns
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SizeF(
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6.4f,
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4.8f,
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)
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every { get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP) } returns
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mockStreamMap
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every { get(CameraCharacteristics.LENS_INFO_AVAILABLE_FOCAL_LENGTHS) } returns
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floatArrayOf(4.25f, 6.0f)
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}
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every { mockCameraManager.cameraIdList } returns arrayOf("0")
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every { mockCameraManager.getCameraCharacteristics("0") } returns mockCharacteristics
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val result = collector.collect()
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assertNotNull(result)
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assertEquals(1, result.size)
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assertEquals("0", result[0].cameraID)
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assertEquals(lensFacingBack, result[0].facing)
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assertEquals("6.4x4.8", result[0].sensorPhysicalSize)
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assertEquals(listOf("4032x3024", "1920x1080"), result[0].supportedResolutions)
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assertEquals(listOf(4.25f, 6.0f), result[0].focalLengths)
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}
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@Test
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@Disabled("CameraCharacteristics.LENS_FACING key is null in unit tests - use instrumented tests")
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internal fun `collect returns multiple cameras`() {
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val backCameraChars =
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mockk<CameraCharacteristics>(relaxed = true) {
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every { get(CameraCharacteristics.LENS_FACING) } returns lensFacingBack
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}
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val frontCameraChars =
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mockk<CameraCharacteristics>(relaxed = true) {
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every { get(CameraCharacteristics.LENS_FACING) } returns lensFacingFront
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}
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every { mockCameraManager.cameraIdList } returns arrayOf("0", "1")
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every { mockCameraManager.getCameraCharacteristics("0") } returns backCameraChars
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every { mockCameraManager.getCameraCharacteristics("1") } returns frontCameraChars
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val result = collector.collect()
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assertEquals(2, result.size)
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assertEquals(lensFacingBack, result[0].facing)
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assertEquals(lensFacingFront, result[1].facing)
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}
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@Test
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internal fun `collect returns empty list when no cameras available`() {
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every { mockCameraManager.cameraIdList } returns arrayOf()
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val result = collector.collect()
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assertNotNull(result)
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assertTrue(result.isEmpty())
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}
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@Test
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internal fun `collect returns empty list when CameraManager unavailable`() {
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every { mockContext.getSystemService(Context.CAMERA_SERVICE) } returns null
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val collectorWithNoCameraManager = CameraCollector(mockContext)
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val result = collectorWithNoCameraManager.collect()
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assertNotNull(result)
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assertTrue(result.isEmpty())
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}
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@Test
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internal fun `collect handles exception from CameraManager gracefully`() {
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every { mockCameraManager.cameraIdList } throws SecurityException("Camera access denied")
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val result = collector.collect()
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assertNotNull(result)
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assertTrue(result.isEmpty())
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}
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}

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