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Clipboard suggestion: mask based on content patterns (OTP/CC/JWT/seed/secret) #2491

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Clipboard suggestion: mask based on content patterns (OTP/CC/JWT/seed/secret) #2491

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26 changes: 25 additions & 1 deletion app/src/main/java/helium314/keyboard/latin/ClipboardHistoryManager.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -104,7 +104,22 @@ class ClipboardHistoryManager(

private fun isClipSensitive(inputType: Int): Boolean {
ClipboardManagerCompat.getClipSensitivity(clipboardManager.primaryClip?.description)?.let { return it }
return InputTypeUtils.isPasswordInputType(inputType)
if (InputTypeUtils.isPasswordInputType(inputType)) return true
val content = retrieveClipboardContent()
return isContentSensitive(content)
}

private fun isContentSensitive(content: CharSequence): Boolean {
if (content.isEmpty()) return false
val text = content.toString()
if (text.length > 5000) return false
if (P_OTP.matcher(text).matches()) return true
if (P_CREDIT_CARD.matcher(text).find()) return true
if (P_JWT.matcher(text).find()) return true
if (P_LONG_HEX.matcher(text).find()) return true
if (P_SEED_PHRASE.matcher(text.trim()).matches()) return true
if (P_SECRET_KEYWORD.matcher(text).find()) return true
return false
}

fun getClipboardSuggestionView(editorInfo: EditorInfo?, parent: ViewGroup?): View? {
Expand Down Expand Up @@ -168,5 +183,14 @@ class ClipboardHistoryManager(
companion object {
private var dontShowCurrentSuggestion: Boolean = false
const val RECENT_TIME_MILLIS = 3 * 60 * 1000L // 3 minutes (for clipboard suggestions)

private val P_OTP = java.util.regex.Pattern.compile("^\\s*\\d{4,8}\\s*$")
private val P_CREDIT_CARD = java.util.regex.Pattern.compile("\\b(?:\\d[ -]*?){13,19}\\b")
private val P_JWT = java.util.regex.Pattern.compile("\\beyJ[A-Za-z0-9_-]{10,}\\.[A-Za-z0-9_-]{10,}\\.[A-Za-z0-9_-]{10,}\\b")
private val P_LONG_HEX = java.util.regex.Pattern.compile("\\b[a-fA-F0-9]{32,}\\b")
private val P_SEED_PHRASE = java.util.regex.Pattern.compile("(?:[a-z]{3,8}\\s+){11,23}[a-z]{3,8}")
private val P_SECRET_KEYWORD = java.util.regex.Pattern.compile(
"(?i)\\b(password|passwd|secret|api[_-]?key|access[_-]?token|bearer|private[_-]?key|ssh-rsa|ssh-ed25519|-----BEGIN [A-Z ]+PRIVATE KEY-----)\\b"
)
}
}