Add a "connectivity warning" bottom sheet.

app/src/main/java/org/thoughtcrime/securesms/util/ConnectivityWarning.kt

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.util
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import org.signal.core.util.logging.Log
+import org.thoughtcrime.securesms.keyvalue.SignalStore
+import java.io.IOException
+import kotlin.time.Duration.Companion.hours
+
+/**
+ * An object representing the configuration of the connectivity warning UI, which lets a user know when they haven't been able to connect to the service.
+ */
+object ConnectivityWarning {
+
+  private val TAG = Log.tag(ConnectivityWarning::class)
+
+  private val config: Config? by lazy {
+    try {
+      JsonUtils.fromJson(RemoteConfig.connectivityWarningConfig, Config::class.java)
+    } catch (e: IOException) {
+      Log.w(TAG, "Failed to parse json!", e)
+      null
+    }
+  }
+
+  /** Whether or not connectivity warnings are enabled. */
+  val isEnabled
+    get() = threshold > 0
+
+  /** If the user has not connected to the service in this amount of time (in ms), then you should show the connectivity warning. A time of <= 0 means never show it. */
+  val threshold = config?.thresholdHours?.hours?.inWholeMilliseconds ?: 0
+
+  /** Whether or not you should prompt the user for a log when notifying them that they are unable to connect. */
+  val isDebugPromptEnabled: Boolean
+    get() {
+      val nonNullConfig = config ?: return false
+
+      if (nonNullConfig.percentDebugPrompt == null) {
+        return false
+      }
+
+      if (nonNullConfig.percentDebugPrompt <= 0f || nonNullConfig.percentDebugPrompt > 100f) {
+        return false
+      }
+
+      val fraction = nonNullConfig.percentDebugPrompt / 100
+      val partsPerMillion = (1_000_000 * fraction).toInt()
+      val bucket = BucketingUtil.bucket(RemoteConfig.CRASH_PROMPT_CONFIG, SignalStore.account.aci!!.rawUuid, 1_000_000)
+
+      return partsPerMillion > bucket
+    }
+
+  private data class Config(
+    @JsonProperty val thresholdHours: Int?,
+    @JsonProperty val percentDebugPrompt: Float?
+  )
+}

app/src/main/java/org/thoughtcrime/securesms/util/RemoteConfig.kt

@@ -1104,5 +1104,12 @@ object RemoteConfig {
     }
   )
 
+  /** JSON object representing some details about how we might want to warn the user around connectivity issues. */
+  val connectivityWarningConfig: String by remoteString(
+    key = "android.connectivityWarningConfig",
+    defaultValue = "",
+    hotSwappable = true
+  )
+
   // endregion
 }