refactor: merge format-common-impl into format-common

Also converts the format-common module into an Android library since
UriTotpFinder requires the Android SDK.

1 files changed, 52 insertions, 0 deletions

diff --git a/format-common/src/main/kotlin/app/passwordstore/util/totp/UriTotpFinder.kt b/format-common/src/main/kotlin/app/passwordstore/util/totp/UriTotpFinder.kt
new file mode 100644
index 00000000..741a21a7
--- /dev/null
+++ b/format-common/src/main/kotlin/app/passwordstore/util/totp/UriTotpFinder.kt
@@ -0,0 +1,52 @@
+package app.passwordstore.util.totp
+
+import android.net.Uri
+import javax.inject.Inject
+
+/** [Uri] backed TOTP URL parser. */
+public class UriTotpFinder @Inject constructor() : TotpFinder {
+
+  private companion object {
+    private const val DEFAULT_TOTP_PERIOD = 30L
+  }
+
+  override fun findSecret(content: String): String? {
+    content.split("\n".toRegex()).forEach { line ->
+      if (line.startsWith(TotpFinder.TOTP_FIELDS[0])) {
+        return Uri.parse(line).getQueryParameter("secret")
+      }
+      if (line.startsWith(TotpFinder.TOTP_FIELDS[1], ignoreCase = true)) {
+        return line.split(": *".toRegex(), 2).toTypedArray()[1]
+      }
+    }
+    return null
+  }
+
+  override fun findDigits(content: String): String {
+    return getQueryParameter(content, "digits") ?: "6"
+  }
+
+  override fun findPeriod(content: String): Long {
+    return getQueryParameter(content, "period")?.toLongOrNull() ?: DEFAULT_TOTP_PERIOD
+  }
+
+  override fun findAlgorithm(content: String): String {
+    return getQueryParameter(content, "algorithm") ?: "sha1"
+  }
+
+  override fun findIssuer(content: String): String? {
+    return getQueryParameter(content, "issuer") ?: Uri.parse(content).authority
+  }
+
+  private fun getQueryParameter(content: String, parameterName: String): String? {
+    content.split("\n".toRegex()).forEach { line ->
+      val uri = Uri.parse(line)
+      if (
+        line.startsWith(TotpFinder.TOTP_FIELDS[0]) && uri.getQueryParameter(parameterName) != null
+      ) {
+        return uri.getQueryParameter(parameterName)
+      }
+    }
+    return null
+  }
+}