From 96f7efa0bb5a7241a3f134c1ace452ab7b8a0793 Mon Sep 17 00:00:00 2001
From: Andrew Podkovyrin <podkovyrin@gmail.com>
Date: Wed, 14 Jun 2017 15:12:01 +0300
Subject: [PATCH] Add costructor for configuring NSURLSession identifier

---
 HWIFileDownloader.h | 15 ++++++++++++++-
 HWIFileDownloader.m | 14 ++++++++++----
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/HWIFileDownloader.h b/HWIFileDownloader.h
index 4ef6558..168d4b8 100644
--- a/HWIFileDownloader.h
+++ b/HWIFileDownloader.h
@@ -51,6 +51,10 @@ typedef void (^HWIFileDownloaderPauseResumeDataBlock)(NSData * _Nullable aResume
  */
 @interface HWIFileDownloader : NSObject
 
+/**
+ NSURLSession's configuration identifier
+ */
+@property (readonly, nonatomic, copy, nonnull) NSString *backgroundSessionIdentifier;
 
 #pragma mark - Initialization
 
@@ -62,13 +66,22 @@ typedef void (^HWIFileDownloaderPauseResumeDataBlock)(NSData * _Nullable aResume
  */
 - (nullable instancetype)initWithDelegate:(nonnull NSObject<HWIFileDownloadDelegate>*)aDelegate;
 
+/**
+ Secondary initializer.
+ @param aDelegate Delegate for salient download events.
+ @param aMaxConcurrentFileDownloadsCount Maximum number of concurrent downloads. Default: no limit.
+ @return HWIFileDownloader.
+ */
+- (nullable instancetype)initWithDelegate:(nonnull NSObject<HWIFileDownloadDelegate>*)aDelegate maxConcurrentDownloads:(NSInteger)aMaxConcurrentFileDownloadsCount;
+
 /**
  Designated initializer.
  @param aDelegate Delegate for salient download events.
  @param aMaxConcurrentFileDownloadsCount Maximum number of concurrent downloads. Default: no limit.
+ @param aBackgroundSessionIdentifier NSURLSession's configuration identifier
  @return HWIFileDownloader.
  */
-- (nullable HWIFileDownloader*)initWithDelegate:(nonnull NSObject<HWIFileDownloadDelegate>*)aDelegate maxConcurrentDownloads:(NSInteger)aMaxConcurrentFileDownloadsCount;
+- (nullable instancetype)initWithDelegate:(nonnull NSObject<HWIFileDownloadDelegate>*)aDelegate maxConcurrentDownloads:(NSInteger)aMaxConcurrentFileDownloadsCount backgroundSessionIdentifier:(nonnull NSString *)aBackgroundSessionIdentifier;
 - (nullable HWIFileDownloader*)init __attribute__((unavailable("use initWithDelegate:maxConcurrentDownloads: or initWithDelegate:")));
 + (nullable HWIFileDownloader*)new __attribute__((unavailable("use initWithDelegate:maxConcurrentDownloads: or initWithDelegate:")));
 
diff --git a/HWIFileDownloader.m b/HWIFileDownloader.m
index 5881fae..0648b70 100644
--- a/HWIFileDownloader.m
+++ b/HWIFileDownloader.m
@@ -39,6 +39,7 @@
 
 @interface HWIFileDownloader()<NSURLSessionDelegate, NSURLSessionTaskDelegate, NSURLSessionDataDelegate, NSURLSessionDownloadDelegate, NSURLConnectionDelegate>
 
+@property (nonatomic, copy, nonnull) NSString *backgroundSessionIdentifier;
 @property (nonatomic, strong, nullable) NSURLSession *backgroundSession;
 @property (nonatomic, strong, nonnull) NSMutableDictionary<NSNumber *, HWIFileDownloadItem *> *activeDownloadsDictionary;
 @property (nonatomic, strong, nonnull) NSMutableArray<NSDictionary <NSString *, NSObject *> *> *waitingDownloadsArray;
@@ -63,12 +64,18 @@ - (nullable instancetype)initWithDelegate:(nonnull NSObject<HWIFileDownloadDeleg
     return [self initWithDelegate:aDelegate maxConcurrentDownloads:-1];
 }
 
-
 - (nullable instancetype)initWithDelegate:(nonnull NSObject<HWIFileDownloadDelegate>*)aDelegate maxConcurrentDownloads:(NSInteger)aMaxConcurrentFileDownloadsCount
+{
+    NSString *aBackgroundDownloadSessionIdentifier = [NSString stringWithFormat:@"%@.HWIFileDownload", [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleIdentifier"]];
+    return [self initWithDelegate:aDelegate maxConcurrentDownloads:aMaxConcurrentFileDownloadsCount backgroundSessionIdentifier:aBackgroundDownloadSessionIdentifier];
+}
+
+- (nullable instancetype)initWithDelegate:(nonnull NSObject<HWIFileDownloadDelegate>*)aDelegate maxConcurrentDownloads:(NSInteger)aMaxConcurrentFileDownloadsCount backgroundSessionIdentifier:(nonnull NSString *)aBackgroundSessionIdentifier
 {
     self = [super init];
     if (self)
     {
+        self.backgroundSessionIdentifier = aBackgroundSessionIdentifier;
         self.maxConcurrentFileDownloadsCount = -1;
         if (aMaxConcurrentFileDownloadsCount > 0)
         {
@@ -82,17 +89,16 @@ - (nullable instancetype)initWithDelegate:(nonnull NSObject<HWIFileDownloadDeleg
         
         if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1)
         {
-            NSString *aBackgroundDownloadSessionIdentifier = [NSString stringWithFormat:@"%@.HWIFileDownload", [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleIdentifier"]];
             NSURLSessionConfiguration *aBackgroundSessionConfiguration = nil;
             if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_7_1)
             {
-                aBackgroundSessionConfiguration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:aBackgroundDownloadSessionIdentifier];
+                aBackgroundSessionConfiguration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:self.backgroundSessionIdentifier];
             }
             else
             {
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-                aBackgroundSessionConfiguration = [NSURLSessionConfiguration backgroundSessionConfiguration:aBackgroundDownloadSessionIdentifier];
+                aBackgroundSessionConfiguration = [NSURLSessionConfiguration backgroundSessionConfiguration:self.backgroundSessionIdentifier];
 #pragma GCC diagnostic pop
             }
             if ([self.fileDownloadDelegate respondsToSelector:@selector(customizeBackgroundSessionConfiguration:)])