From 9b850908847bd8c26d4dcb5110380aa7b3fcf5a9 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Mon, 21 Sep 2020 18:03:51 -0400
Subject: [PATCH] Add  debug environment variable to disable image caching

---
 Tusker.xcodeproj/xcshareddata/xcschemes/Tusker.xcscheme | 7 +++++++
 Tusker/Caching/ImageCache.swift                         | 9 ++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/Tusker.xcodeproj/xcshareddata/xcschemes/Tusker.xcscheme b/Tusker.xcodeproj/xcshareddata/xcschemes/Tusker.xcscheme
index bfc43462..1597e75e 100644
--- a/Tusker.xcodeproj/xcshareddata/xcschemes/Tusker.xcscheme
+++ b/Tusker.xcodeproj/xcshareddata/xcschemes/Tusker.xcscheme
@@ -89,6 +89,13 @@
             isEnabled = "YES">
          </CommandLineArgument>
       </CommandLineArguments>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "DISABLE_IMAGE_CACHE"
+            value = "1"
+            isEnabled = "NO">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
diff --git a/Tusker/Caching/ImageCache.swift b/Tusker/Caching/ImageCache.swift
index 792fda47..6c8de3a6 100644
--- a/Tusker/Caching/ImageCache.swift
+++ b/Tusker/Caching/ImageCache.swift
@@ -15,6 +15,12 @@ class ImageCache {
     static let headers = ImageCache(name: "Headers", memoryExpiry: .seconds(60 * 5), diskExpiry: .seconds(60 * 60))
     static let attachments = ImageCache(name: "Attachments", memoryExpiry: .seconds(60 * 2))
     static let emojis = ImageCache(name: "Emojis", memoryExpiry: .seconds(60 * 5), diskExpiry: .seconds(60 * 60))
+    
+    #if DEBUG
+    private static let disableCaching = ProcessInfo.processInfo.environment.keys.contains("DISABLE_IMAGE_CACHE")
+    #else
+    private static let disableCaching = false
+    #endif
 
     private let cache: Cache<Data>
     
@@ -38,7 +44,8 @@ class ImageCache {
     
     func get(_ url: URL, completion: ((Data?) -> Void)?) -> Request? {
         let key = url.absoluteString
-        if let data = try? cache.object(forKey: key) {
+        if !ImageCache.disableCaching,
+           let data = try? cache.object(forKey: key) {
             completion?(data)
             return nil
         } else {