Add iOS and Android basic DRM support (#1445)

This PR adds support for DRM streams on iOS (Fairplay) and Android (Playready, Widevine, Clearkey)

I am neither Android nor iOS developer, so feel free to provide feedback to improve this PR.

**Test stream for ANDROID:**
```
testStream = {
        uri: 'http://profficialsite.origin.mediaservices.windows.net/c51358ea-9a5e-4322-8951-897d640fdfd7/tearsofsteel_4k.ism/manifest(format=mpd-time-csf)',
        type: 'mpd',
        drm: {
            type: DRMType.PLAYREADY,
            licenseServer: 'http://test.playready.microsoft.com/service/rightsmanager.asmx?cfg=(persist:false,sl:150)'
        }
    };
```

or 
```
{
    uri: 'https://media.axprod.net/TestVectors/v7-MultiDRM-SingleKey/Manifest_1080p.mpd',
    drm: {
        type: 'widevine', //or DRMType.WIDEVINE
        licenseServer: 'https://drm-widevine-licensing.axtest.net/AcquireLicense',
        headers: {
            'X-AxDRM-Message': 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ2ZXJzaW9uIjoxLCJjb21fa2V5X2lkIjoiYjMzNjRlYjUtNTFmNi00YWUzLThjOTgtMzNjZWQ1ZTMxYzc4IiwibWVzc2FnZSI6eyJ0eXBlIjoiZW50aXRsZW1lbnRfbWVzc2FnZSIsImZpcnN0X3BsYXlfZXhwaXJhdGlvbiI6NjAsInBsYXlyZWFkeSI6eyJyZWFsX3RpbWVfZXhwaXJhdGlvbiI6dHJ1ZX0sImtleXMiOlt7ImlkIjoiOWViNDA1MGQtZTQ0Yi00ODAyLTkzMmUtMjdkNzUwODNlMjY2IiwiZW5jcnlwdGVkX2tleSI6ImxLM09qSExZVzI0Y3Iya3RSNzRmbnc9PSJ9XX19.FAbIiPxX8BHi9RwfzD7Yn-wugU19ghrkBFKsaCPrZmU'
        },
    }
}
```

**Test stream for iOS:**
Sorry but I can not provide free streams to test. If anyone can provide test streams, or found some we can use, please let me know to also test them.

It has been tested with a private provider and they work, at least with the `getLicense` override method. (An example implementation is provided in the README)

ios/Video/RCTVideo.h

@@ -14,11 +14,11 @@
 
 @class RCTEventDispatcher;
 #if __has_include(<react-native-video/RCTVideoCache.h>)
-@interface RCTVideo : UIView <RCTVideoPlayerViewControllerDelegate, DVAssetLoaderDelegatesDelegate>
+@interface RCTVideo : UIView <RCTVideoPlayerViewControllerDelegate, DVAssetLoaderDelegatesDelegate, AVAssetResourceLoaderDelegate>
 #elif TARGET_OS_TV
-@interface RCTVideo : UIView <RCTVideoPlayerViewControllerDelegate>
+@interface RCTVideo : UIView <RCTVideoPlayerViewControllerDelegate, AVAssetResourceLoaderDelegate>
 #else
-@interface RCTVideo : UIView <RCTVideoPlayerViewControllerDelegate, AVPictureInPictureControllerDelegate>
+@interface RCTVideo : UIView <RCTVideoPlayerViewControllerDelegate, AVPictureInPictureControllerDelegate, AVAssetResourceLoaderDelegate>
 #endif
 
 @property (nonatomic, copy) RCTDirectEventBlock onVideoLoadStart;
@@ -42,11 +42,26 @@
 @property (nonatomic, copy) RCTDirectEventBlock onVideoExternalPlaybackChange;
 @property (nonatomic, copy) RCTDirectEventBlock onPictureInPictureStatusChanged;
 @property (nonatomic, copy) RCTDirectEventBlock onRestoreUserInterfaceForPictureInPictureStop;
+@property (nonatomic, copy) RCTDirectEventBlock onGetLicense;
+
+typedef NS_ENUM(NSInteger, RCTVideoError) {
+    RCTVideoErrorFromJSPart,
+    RCTVideoErrorLicenseRequestNotOk,
+    RCTVideoErrorNoDataFromLicenseRequest,
+    RCTVideoErrorNoSPC,
+    RCTVideoErrorNoDataRequest,
+    RCTVideoErrorNoCertificateData,
+    RCTVideoErrorNoCertificateURL,
+    RCTVideoErrorNoFairplayDRM,
+    RCTVideoErrorNoDRMData
+};
 
 - (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher NS_DESIGNATED_INITIALIZER;
 
 - (AVPlayerViewController*)createPlayerViewController:(AVPlayer*)player withPlayerItem:(AVPlayerItem*)playerItem;
 
 - (void)save:(NSDictionary *)options resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject;
+- (void)setLicenseResult:(NSString * )license;
+- (BOOL)setLicenseResultError:(NSString * )error;
 
 @end

ios/Video/RCTVideoManager.m

@@ -19,6 +19,7 @@ RCT_EXPORT_MODULE();
 }
 
 RCT_EXPORT_VIEW_PROPERTY(src, NSDictionary);
+RCT_EXPORT_VIEW_PROPERTY(drm, NSDictionary);
 RCT_EXPORT_VIEW_PROPERTY(maxBitRate, float);
 RCT_EXPORT_VIEW_PROPERTY(resizeMode, NSString);
 RCT_EXPORT_VIEW_PROPERTY(repeat, BOOL);
@@ -68,6 +69,7 @@ RCT_EXPORT_VIEW_PROPERTY(onPlaybackStalled, RCTDirectEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onPlaybackResume, RCTDirectEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onPlaybackRateChange, RCTDirectEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onVideoExternalPlaybackChange, RCTDirectEventBlock);
+RCT_EXPORT_VIEW_PROPERTY(onGetLicense, RCTDirectEventBlock);
 RCT_REMAP_METHOD(save,
         options:(NSDictionary *)options
         reactTag:(nonnull NSNumber *)reactTag
@@ -82,7 +84,34 @@ RCT_REMAP_METHOD(save,
             [view save:options resolve:resolve reject:reject];
         }
     }];
-}
+};
+RCT_REMAP_METHOD(setLicenseResult,
+         license:(NSString *)license
+         reactTag:(nonnull NSNumber *)reactTag)
+{
+    [self.bridge.uiManager prependUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, RCTVideo *> *viewRegistry) {
+        RCTVideo *view = viewRegistry[reactTag];
+        if (![view isKindOfClass:[RCTVideo class]]) {
+            RCTLogError(@"Invalid view returned from registry, expecting RCTVideo, got: %@", view);
+        } else {
+            [view setLicenseResult:license];
+        }
+    }];
+};
+
+RCT_REMAP_METHOD(setLicenseResultError,
+                 error:(NSString *)error
+                 reactTag:(nonnull NSNumber *)reactTag)
+{
+    [self.bridge.uiManager prependUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, RCTVideo *> *viewRegistry) {
+        RCTVideo *view = viewRegistry[reactTag];
+        if (![view isKindOfClass:[RCTVideo class]]) {
+            RCTLogError(@"Invalid view returned from registry, expecting RCTVideo, got: %@", view);
+        } else {
+            [view setLicenseResultError:error];
+        }
+    }];
+};
 RCT_EXPORT_VIEW_PROPERTY(onPictureInPictureStatusChanged, RCTDirectEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onRestoreUserInterfaceForPictureInPictureStop, RCTDirectEventBlock);