Add logic for parting a TOTP code from a Uri or Intent (#4032)

app/src/main/java/com/x8bit/bitwarden/ui/vault/model/TotpData.kt

@@ -0,0 +1,55 @@
+package com.x8bit.bitwarden.ui.vault.model
+
+import android.os.Parcelable
+import kotlinx.parcelize.Parcelize
+
+/**
+ * Represents the data for TOTP deeplink.
+ *
+ * @property uri The raw uri as a string.
+ * @property issuer The issuer parameter is a string value indicating the provider or service this
+ * account is associated with, URL-encoded according to RFC 3986.
+ * @property accountName The users email address.
+ * @property secret The secret parameter is an arbitrary key value encoded in Base32 according to
+ * RFC 3548. The padding specified in RFC 3548 section 2.2 is not required and should be omitted.
+ * @property digits The digits parameter may have the values 6 or 8, and determines how long of a
+ * one-time passcode to display to the user.
+ * @property period The period parameter defines a period that a TOTP code will be valid for, in
+ * seconds.
+ * @property algorithm The algorithm may have the values.
+ */
+@Parcelize
+data class TotpData(
+    val uri: String,
+    val issuer: String?,
+    val accountName: String?,
+    val secret: String,
+    val digits: Int,
+    val period: Int,
+    val algorithm: CryptoHashAlgorithm,
+) : Parcelable {
+    /**
+     * A representation of the various cryptographic hash algorithms used by TOTP.
+     */
+    enum class CryptoHashAlgorithm(val value: String) {
+        SHA_1(value = "sha1"),
+        SHA_256(value = "sha256"),
+        SHA_512(value = "sha512"),
+        MD_5(value = "md5"),
+        ;
+
+        @Suppress("UndocumentedPublicClass")
+        companion object {
+            /**
+             * Attempts to convert the string [value] to a valid [CryptoHashAlgorithm] or null if
+             * a match could not be found.
+             */
+            fun parse(
+                value: String?,
+            ): CryptoHashAlgorithm? =
+                CryptoHashAlgorithm
+                    .entries
+                    .firstOrNull { it.value.equals(other = value, ignoreCase = true) }
+        }
+    }
+}

app/src/main/java/com/x8bit/bitwarden/ui/vault/util/TotpIntentUtils.kt

@@ -0,0 +1,10 @@
+package com.x8bit.bitwarden.ui.vault.util
+
+import android.content.Intent
+import com.x8bit.bitwarden.ui.vault.model.TotpData
+
+/**
+ * Checks if the given [Intent] contains data for a TOTP. The [TotpData] will be returned when the
+ * correct data is present or `null` if data is invalid or missing.
+ */
+fun Intent.getTotpDataOrNull(): TotpData? = this.data?.getTotpDataOrNull()

app/src/main/java/com/x8bit/bitwarden/ui/vault/util/TotpUriUtils.kt

@@ -0,0 +1,48 @@
+package com.x8bit.bitwarden.ui.vault.util
+
+import android.net.Uri
+import com.x8bit.bitwarden.ui.vault.model.TotpData
+
+private const val TOTP_HOST_NAME: String = "totp"
+private const val TOTP_SCHEME_NAME: String = "otpauth"
+private const val PARAM_NAME_ALGORITHM: String = "algorithm"
+private const val PARAM_NAME_DIGITS: String = "digits"
+private const val PARAM_NAME_ISSUER: String = "issuer"
+private const val PARAM_NAME_PERIOD: String = "period"
+private const val PARAM_NAME_SECRET: String = "secret"
+
+/**
+ * Checks if the given [Uri] contains valid data for a TOTP. The [TotpData] will be returned when
+ * the correct data is present or `null` if data is invalid or missing.
+ */
+fun Uri.getTotpDataOrNull(): TotpData? {
+    // Must be a "otpauth" scheme
+    if (!this.scheme.equals(other = TOTP_SCHEME_NAME, ignoreCase = true)) return null
+    // Must be a "totp" host
+    if (!this.host.equals(other = TOTP_HOST_NAME, ignoreCase = true)) return null
+    // Must contain a "secret"
+    val secret = this.getQueryParameter(PARAM_NAME_SECRET)?.trim() ?: return null
+    val segments = this.pathSegments?.firstOrNull()?.split(":")
+    val segmentCount = segments?.size ?: 0
+    return TotpData(
+        uri = this.toString(),
+        issuer = this.getQueryParameter(PARAM_NAME_ISSUER)
+            ?: segments?.firstOrNull()?.trim()?.takeIf { segmentCount > 1 },
+        accountName = if (segmentCount > 1) {
+            segments?.getOrNull(index = 1)?.trim()
+        } else {
+            segments?.firstOrNull()?.trim()
+        },
+        secret = secret,
+        digits = this.getQueryParameter(PARAM_NAME_DIGITS)?.trim()?.toIntOrNull() ?: 6,
+        period = this
+            .getQueryParameter(PARAM_NAME_PERIOD)
+            ?.trim()
+            ?.toIntOrNull()
+            ?.takeUnless { it <= 0 }
+            ?: 30,
+        algorithm = TotpData.CryptoHashAlgorithm
+            .parse(value = this.getQueryParameter(PARAM_NAME_ALGORITHM)?.trim())
+            ?: TotpData.CryptoHashAlgorithm.SHA_1,
+    )
+}

app/src/test/java/com/x8bit/bitwarden/ui/vault/util/TotpIntentUtilsTest.kt

@@ -0,0 +1,62 @@
+package com.x8bit.bitwarden.ui.vault.util
+
+import android.content.Intent
+import android.net.Uri
+import com.x8bit.bitwarden.ui.vault.model.TotpData
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkStatic
+import io.mockk.unmockkStatic
+import org.junit.jupiter.api.AfterEach
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+class TotpIntentUtilsTest {
+
+    @BeforeEach
+    fun setup() {
+        mockkStatic(Uri::getTotpDataOrNull)
+    }
+
+    @AfterEach
+    fun tearDown() {
+        unmockkStatic(Uri::getTotpDataOrNull)
+    }
+
+    @Test
+    fun `getTotpDataOrNull with null data should return null`() {
+        val intent = mockk<Intent> {
+            every { data } returns null
+        }
+
+        assertNull(intent.getTotpDataOrNull())
+    }
+
+    @Test
+    fun `getTotpDataOrNull with null uri getTotpDataOrNull should return null`() {
+        val uri = mockk<Uri> {
+            every { getTotpDataOrNull() } returns null
+        }
+        val intent = mockk<Intent> {
+            every { data } returns uri
+        }
+
+        assertNull(intent.getTotpDataOrNull())
+    }
+
+    @Test
+    fun `getTotpDataOrNull with valid uri getTotpDataOrNull should return totpData`() {
+        val totpData = mockk<TotpData>()
+        val uri = mockk<Uri> {
+            every { getTotpDataOrNull() } returns totpData
+        }
+        val intent = mockk<Intent> {
+            every { data } returns uri
+        }
+        println(intent)
+
+        assertEquals(totpData, intent.getTotpDataOrNull())
+    }
+}

app/src/test/java/com/x8bit/bitwarden/ui/vault/util/TotpUriUtilsTest.kt

@@ -0,0 +1,101 @@
+package com.x8bit.bitwarden.ui.vault.util
+
+import android.net.Uri
+import com.x8bit.bitwarden.ui.vault.model.TotpData
+import com.x8bit.bitwarden.ui.vault.model.TotpData.CryptoHashAlgorithm
+import io.mockk.every
+import io.mockk.mockk
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.Test
+
+class TotpUriUtilsTest {
+
+    @Test
+    fun `getTotpDataOrNull with incorrect scheme returns null`() {
+        val uri = mockk<Uri> {
+            every { scheme } returns "wrong"
+        }
+
+        assertNull(uri.getTotpDataOrNull())
+    }
+
+    @Test
+    fun `getTotpDataOrNull with incorrect host returns null`() {
+        val uri = mockk<Uri> {
+            every { scheme } returns "otpauth"
+            every { host } returns "hotp"
+        }
+
+        assertNull(uri.getTotpDataOrNull())
+    }
+
+    @Test
+    fun `getTotpDataOrNull without secret returns null`() {
+        val uri = mockk<Uri> {
+            every { scheme } returns "otpauth"
+            every { host } returns "totp"
+            every { getQueryParameter("secret") } returns null
+        }
+
+        assertNull(uri.getTotpDataOrNull())
+    }
+
+    @Test
+    fun `getTotpDataOrNull with minimum required values returns TotpData with defaults`() {
+        val secret = "secret"
+        val uri = mockk<Uri> {
+            every { scheme } returns "otpauth"
+            every { host } returns "totp"
+            every { pathSegments } returns emptyList()
+            every { getQueryParameter("secret") } returns secret
+            every { getQueryParameter("digits") } returns null
+            every { getQueryParameter("issuer") } returns null
+            every { getQueryParameter("period") } returns null
+            every { getQueryParameter("algorithm") } returns null
+        }
+
+        val expectedResult = TotpData(
+            uri = uri.toString(),
+            issuer = null,
+            accountName = null,
+            secret = secret,
+            digits = 6,
+            period = 30,
+            algorithm = CryptoHashAlgorithm.SHA_1,
+        )
+
+        assertEquals(expectedResult, uri.getTotpDataOrNull())
+    }
+
+    @Test
+    fun `getTotpDataOrNull with complete values returns custom TotpData`() {
+        val secret = "secret"
+        val digits = 8
+        val issuer = "Bitwarden"
+        val period = 25
+        val algorithm = "sha256"
+        val accountName = "[email protected]"
+        val uri = mockk<Uri> {
+            every { scheme } returns "otpauth"
+            every { host } returns "totp"
+            every { pathSegments } returns listOf("$issuer:$accountName")
+            every { getQueryParameter("secret") } returns secret
+            every { getQueryParameter("digits") } returns digits.toString()
+            every { getQueryParameter("issuer") } returns issuer
+            every { getQueryParameter("period") } returns period.toString()
+            every { getQueryParameter("algorithm") } returns algorithm
+        }
+        val expectedResult = TotpData(
+            uri = uri.toString(),
+            issuer = issuer,
+            accountName = accountName,
+            secret = secret,
+            digits = digits,
+            period = period,
+            algorithm = CryptoHashAlgorithm.SHA_256,
+        )
+
+        assertEquals(expectedResult, uri.getTotpDataOrNull())
+    }
+}