Add support for Oreo Autofill (#653)

Adds support for the Autofill feature first available in Android Oreo.

In compatible apps and browsers, login forms are automatically detected and
the user is presented with options to fill or generate credentials. In most apps
and certain browsers, the service will also offer to create new Password Store
entries from credentials entered into login forms.

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>
Co-authored-by: Harsh Shandilya <me@msfjarvis.dev>

1 files changed, 21 insertions, 10 deletions

diff --git a/app/src/main/java/com/zeapo/pwdstore/PasswordEntry.kt b/app/src/main/java/com/zeapo/pwdstore/PasswordEntry.kt
index e692c5af..c75fb02d 100644
--- a/app/src/main/java/com/zeapo/pwdstore/PasswordEntry.kt
+++ b/app/src/main/java/com/zeapo/pwdstore/PasswordEntry.kt
@@ -20,7 +20,7 @@ class PasswordEntry(private val content: String) {
     val totpAlgorithm: String
     val hotpSecret: String?
     val hotpCounter: Long?
-    var extraContent: String? = null
+    var extraContent: String
         private set
     private var isIncremented = false
 
@@ -41,7 +41,7 @@ class PasswordEntry(private val content: String) {
     }
 
     fun hasExtraContent(): Boolean {
-        return !extraContent.isNullOrEmpty()
+        return extraContent.isNotEmpty()
     }
 
     fun hasUsername(): Boolean {
@@ -63,19 +63,30 @@ class PasswordEntry(private val content: String) {
     fun incrementHotp() {
         content.split("\n".toRegex()).forEach { line ->
             if (line.startsWith("otpauth://hotp/")) {
-                extraContent = extraContent?.replaceFirst("counter=[0-9]+".toRegex(), "counter=${hotpCounter!! + 1}")
+                extraContent = extraContent.replaceFirst("counter=[0-9]+".toRegex(), "counter=${hotpCounter!! + 1}")
                 isIncremented = true
             }
         }
     }
 
+    val extraContentWithoutUsername by lazy {
+        var usernameFound = false
+        extraContent.splitToSequence("\n").filter { line ->
+            if (usernameFound)
+                return@filter true
+            if (USERNAME_FIELDS.any { prefix -> line.startsWith(prefix, ignoreCase = true) }) {
+                usernameFound = true
+                return@filter false
+            }
+            true
+        }.joinToString(separator = "\n")
+    }
+
     private fun findUsername(): String? {
-        val extraLines = extraContent!!.split("\n".toRegex())
-        for (line in extraLines) {
-            for (field in USERNAME_FIELDS) {
-                if (line.toLowerCase().startsWith("$field:", ignoreCase = true)) {
-                    return line.split(": *".toRegex(), 2).toTypedArray()[1]
-                }
+        extraContent.splitToSequence("\n").forEach { line ->
+            for (prefix in USERNAME_FIELDS) {
+                if (line.startsWith(prefix, ignoreCase = true))
+                    return line.substring(prefix.length).trimStart()
             }
         }
         return null
@@ -152,6 +163,6 @@ class PasswordEntry(private val content: String) {
 
     companion object {
 
-        private val USERNAME_FIELDS = arrayOf("login", "username")
+        private val USERNAME_FIELDS = arrayOf("login:", "username:")
     }
 }