Refactor TOTP implementation and expand SteamGuard hacks (#1460)

* UriTotpFinder: commonize query parameter handling

* gitignore: add more IDEA files

* TotpFinder: add `findIssuer`

* PasswordEntry: don't eagerly fetch TOTP related fields

* format-common: expand SteamGuard workaround

* CHANGELOG: add SteamGuard workaround

2 files changed, 20 insertions, 17 deletions

diff --git a/app/src/main/java/dev/msfjarvis/aps/util/totp/UriTotpFinder.kt b/app/src/main/java/dev/msfjarvis/aps/util/totp/UriTotpFinder.kt
index fa8481a9..a420fe5d 100644
--- a/app/src/main/java/dev/msfjarvis/aps/util/totp/UriTotpFinder.kt
+++ b/app/src/main/java/dev/msfjarvis/aps/util/totp/UriTotpFinder.kt
@@ -24,32 +24,29 @@ class UriTotpFinder @Inject constructor() : TotpFinder {
   }
 
   override fun findDigits(content: String): String {
-    content.split("\n".toRegex()).forEach { line ->
-      if (line.startsWith(TOTP_FIELDS[0]) && Uri.parse(line).getQueryParameter("digits") != null) {
-        return Uri.parse(line).getQueryParameter("digits")!!
-      }
-    }
-    return "6"
+    return getQueryParameter(content, "digits") ?: "6"
   }
 
   override fun findPeriod(content: String): Long {
-    content.split("\n".toRegex()).forEach { line ->
-      if (line.startsWith(TOTP_FIELDS[0]) && Uri.parse(line).getQueryParameter("period") != null) {
-        val period = Uri.parse(line).getQueryParameter("period")!!.toLongOrNull()
-        if (period != null && period > 0) return period
-      }
-    }
-    return 30
+    return getQueryParameter(content, "period")?.toLongOrNull() ?: 30
   }
 
   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 ->
-      if (line.startsWith(TOTP_FIELDS[0]) && Uri.parse(line).getQueryParameter("algorithm") != null
-      ) {
-        return Uri.parse(line).getQueryParameter("algorithm")!!
+      val uri = Uri.parse(line)
+      if (line.startsWith(TOTP_FIELDS[0]) && uri.getQueryParameter(parameterName) != null) {
+        return uri.getQueryParameter(parameterName)
       }
     }
-    return "sha1"
+    return null
   }
 
   companion object {
diff --git a/app/src/test/java/dev/msfjarvis/aps/util/totp/UriTotpFinderTest.kt b/app/src/test/java/dev/msfjarvis/aps/util/totp/UriTotpFinderTest.kt
index f04913a1..37cbef2f 100644
--- a/app/src/test/java/dev/msfjarvis/aps/util/totp/UriTotpFinderTest.kt
+++ b/app/src/test/java/dev/msfjarvis/aps/util/totp/UriTotpFinderTest.kt
@@ -45,6 +45,12 @@ class UriTotpFinderTest {
     assertEquals("SHA256", totpFinder.findAlgorithm(PASS_FILE_CONTENT))
   }
 
+  @Test
+  fun findIssuer() {
+    assertEquals("ACME Co", totpFinder.findIssuer(TOTP_URI))
+    assertEquals("ACME Co", totpFinder.findIssuer(PASS_FILE_CONTENT))
+  }
+
   companion object {
 
     const val TOTP_URI =