Make CameraX blocklist remote configurable.

core-util/src/main/java/org/signal/core/util/StringExtensions.kt

@@ -0,0 +1,23 @@
+package org.signal.core.util
+
+/**
+ * Treats the string as a serialized list of tokens and tells you if an item is present in the list.
+ * In addition to exact matches, this handles wildcards at the end of an item.
+ *
+ * e.g. a,b,c*,d
+ */
+fun String.asListContains(item: String): Boolean {
+  val items: List<String> = this
+    .split(",")
+    .map { it.trim() }
+    .filter { it.isNotEmpty() }
+    .toList()
+
+  val exactMatches = items.filter { it.last() != '*' }
+  val prefixMatches = items.filter { it.last() == '*' }
+
+  return exactMatches.contains(item) ||
+    prefixMatches
+      .map { it.substring(0, it.length - 1) }
+      .any { item.startsWith(it) }
+}

core-util/src/test/java/org/signal/core/util/StringExtensions_asListContains.kt

@@ -0,0 +1,39 @@
+package org.signal.core.util
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.Parameterized
+
+@RunWith(Parameterized::class)
+class StringExtensions_asListContains(
+  private val model: String,
+  private val serializedList: String,
+  private val expected: Boolean
+) {
+
+  @Test
+  fun testModelInList() {
+    val actual = serializedList.asListContains(model)
+    assertEquals(expected, actual)
+  }
+
+  companion object {
+    @JvmStatic
+    @Parameterized.Parameters(name = "{index}: modelInList(model={0}, list={1})={2}")
+    fun data(): List<Array<Any>> {
+      return listOf<Array<Any>>(
+        arrayOf("a", "a", true),
+        arrayOf("a", "a,b", true),
+        arrayOf("a", "c,a,b", true),
+        arrayOf("ab", "a*", true),
+        arrayOf("ab", "c,a*,b", true),
+        arrayOf("abc", "c,ab*,b", true),
+
+        arrayOf("a", "b", false),
+        arrayOf("a", "abc", false),
+        arrayOf("b", "a*", false),
+      ).toList()
+    }
+  }
+}