90 lines
3.3 KiB
Kotlin
90 lines
3.3 KiB
Kotlin
package org.thoughtcrime.securesms.util
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import android.content.Context
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import android.graphics.*
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import android.graphics.drawable.BitmapDrawable
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import android.text.TextPaint
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import android.text.TextUtils
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import network.loki.messenger.R
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import java.math.BigInteger
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import java.security.MessageDigest
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import java.util.*
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object AvatarPlaceholderGenerator {
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private const val EMPTY_LABEL = "0"
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@JvmStatic
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fun generate(context: Context, pixelSize: Int, hashString: String, displayName: String?): BitmapDrawable {
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val hash: Long
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if (hashString.length >= 12 && hashString.matches(Regex("^[0-9A-Fa-f]+\$"))) {
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hash = getSha512(hashString).substring(0 until 12).toLong(16)
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} else {
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hash = 0
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}
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// Do not cache color array, it may be different depends on the current theme.
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val colorArray = context.resources.getIntArray(R.array.profile_picture_placeholder_colors)
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val colorPrimary = colorArray[(hash % colorArray.size).toInt()]
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val labelText = when {
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!TextUtils.isEmpty(displayName) -> extractLabel(displayName!!.capitalize())
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!TextUtils.isEmpty(hashString) -> extractLabel(hashString)
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else -> EMPTY_LABEL
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}
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val bitmap = Bitmap.createBitmap(pixelSize, pixelSize, Bitmap.Config.ARGB_8888)
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val canvas = Canvas(bitmap)
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// Draw background/frame
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val paint = Paint(Paint.ANTI_ALIAS_FLAG)
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paint.color = colorPrimary
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canvas.drawCircle(pixelSize.toFloat() / 2, pixelSize.toFloat() / 2, pixelSize.toFloat() / 2, paint)
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// Draw text
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val textPaint = TextPaint(Paint.ANTI_ALIAS_FLAG)
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textPaint.typeface = Typeface.create(Typeface.DEFAULT, Typeface.NORMAL)
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textPaint.textSize = pixelSize * 0.5f
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textPaint.color = Color.WHITE
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val areaRect = Rect(0, 0, pixelSize, pixelSize)
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val textBounds = RectF(areaRect)
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textBounds.right = textPaint.measureText(labelText)
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textBounds.bottom = textPaint.descent() - textPaint.ascent()
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textBounds.left += (areaRect.width() - textBounds.right) * 0.5f
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textBounds.top += (areaRect.height() - textBounds.bottom) * 0.5f
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canvas.drawText(labelText, textBounds.left, textBounds.top - textPaint.ascent(), textPaint)
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return BitmapDrawable(context.resources, bitmap)
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}
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private fun extractLabel(content: String): String {
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var content = content.trim()
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if (content.isEmpty()) return EMPTY_LABEL
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return if (content.length > 2 && content.startsWith("05")) {
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content[2].toString().toUpperCase(Locale.ROOT)
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} else {
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content.first().toString().toUpperCase(Locale.ROOT)
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}
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}
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private fun getSha512(input: String): String {
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val messageDigest = MessageDigest.getInstance("SHA-512").digest(input.toByteArray())
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// Convert byte array into signum representation
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val no = BigInteger(1, messageDigest)
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// Convert message digest into hex value
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var hashText: String = no.toString(16)
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// Add preceding 0s to make it 32 bytes
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if (hashText.length < 128) {
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val sb = StringBuilder()
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for (i in 0 until 128 - hashText.length) {
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sb.append('0')
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}
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hashText = sb.append(hashText).toString()
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}
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return hashText
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}
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} |