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RNPFImageLoader.m
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RNPFImageLoader.m
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#import "RNPFImageLoader.h"
#import <Photos/Photos.h>
#import <React/RCTUtils.h>
#import "RNPFGlobals.h"
@implementation RNPFImageLoader
RCT_EXPORT_MODULE()
@synthesize bridge = _bridge;
- (BOOL)canLoadImageURL:(NSURL *)requestURL
{
if (![PHAsset class]) {
return NO;
}
return [requestURL.scheme caseInsensitiveCompare:PHOTOS_SCHEME_IDENTIFIER] == NSOrderedSame;
}
-(PHAsset *)getAssetFromNSUrl:(NSURL *)url {
static PHFetchOptions *fetchOptions = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
fetchOptions = [[PHFetchOptions alloc] init];
[fetchOptions setIncludeHiddenAssets:YES];
[fetchOptions setIncludeAllBurstAssets:YES];
[fetchOptions setWantsIncrementalChangeDetails:NO];
});
NSString *localIdentifier = [url.absoluteString substringFromIndex:PHOTOS_SCHEME_IDENTIFIER_WITHSIGNS.length];
PHFetchResult *results = [PHAsset fetchAssetsWithLocalIdentifiers:@[localIdentifier] options:fetchOptions];
if([results count] == 0) {
return nil;
}
return [results firstObject];
}
-(RCTImageLoaderCancellationBlock) loadAssetAsData:(NSURL *)imageURL completionHandler:(RNPFDataLoaderCompletionBlock)completionHandler {
PHAsset *asset = [self getAssetFromNSUrl:imageURL];
if(asset.mediaType == PHAssetMediaTypeImage) {
return [self loadImageAssetAsData:asset completionHandler:completionHandler];
}else if(asset.mediaType == PHAssetMediaTypeVideo) {
return [self loadVideoAssetAsData:asset completionHandler:completionHandler];
}
return ^{};
}
-(RCTImageLoaderCancellationBlock) loadImageAssetAsData:(PHAsset *)asset completionHandler:(RNPFDataLoaderCompletionBlock)completionHandler
{
if (asset == nil) {
NSString *errorText = [NSString stringWithFormat:@"Failed to fetch localIdentifier with url %@ with no error message.", asset.localIdentifier];
completionHandler(RCTErrorWithMessage(errorText), nil);
return ^{};
}
PHImageRequestOptions *imageOptions = [PHImageRequestOptions new];
imageOptions.networkAccessAllowed = YES;
imageOptions.resizeMode = PHImageRequestOptionsResizeModeNone;
imageOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
PHImageRequestID requestID =
[[PHCachingImageManagerInstance sharedCachingManager] requestImageDataForAsset:asset options:imageOptions resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
completionHandler(nil, imageData);
}];
return ^{
[[PHCachingImageManagerInstance sharedCachingManager] cancelImageRequest:requestID];
};
}
-(RCTImageLoaderCancellationBlock) loadVideoAssetAsData:(PHAsset *)asset completionHandler:(RNPFDataLoaderCompletionBlock)completionHandler
{
if (asset == nil) {
NSString *errorText = [NSString stringWithFormat:@"Failed to fetch localIdentifier with url %@ with no error message.", asset.localIdentifier];
completionHandler(RCTErrorWithMessage(errorText), nil);
return ^{};
}
PHVideoRequestOptions *videoOptions = [PHVideoRequestOptions new];
videoOptions.networkAccessAllowed = YES;
videoOptions.version=PHVideoRequestOptionsVersionOriginal;
PHImageRequestID requestID = [[PHCachingImageManagerInstance sharedCachingManager] requestAVAssetForVideo:asset options:videoOptions resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info)
{
if ([asset isKindOfClass:[AVURLAsset class]])
{
NSURL *URL = [(AVURLAsset *)asset URL];
NSData *videoData=[NSData dataWithContentsOfURL:URL];
completionHandler(nil, videoData);
}
}];
return ^{
[[PHCachingImageManagerInstance sharedCachingManager] cancelImageRequest:requestID];
};
}
- (RCTImageLoaderCancellationBlock)loadImageForURL:(NSURL *)imageURL
size:(CGSize)size
scale:(CGFloat)scale
resizeMode:(RCTResizeMode)resizeMode
progressHandler:(RCTImageLoaderProgressBlock)progressHandler
partialLoadHandler:(RCTImageLoaderPartialLoadBlock)partialLoadHandler
completionHandler:(RCTImageLoaderCompletionBlock)completionHandler
{
PHAsset *asset = [self getAssetFromNSUrl:imageURL];
if (asset == nil) {
NSString *errorText = [NSString stringWithFormat:@"Failed to fetch PHAsset with url %@ with no error message.", [imageURL absoluteString]];
completionHandler(RCTErrorWithMessage(errorText), nil);
return ^{};
}
PHImageRequestOptions *imageOptions = [PHImageRequestOptions new];
imageOptions.networkAccessAllowed = YES;
if (progressHandler) {
imageOptions.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary<NSString *, id> *info) {
static const double multiplier = 1e6;
progressHandler(progress * multiplier, multiplier);
};
}
BOOL useMaximumSize = CGSizeEqualToSize(size, CGSizeZero);
CGSize targetSize;
if (useMaximumSize) {
targetSize = PHImageManagerMaximumSize;
imageOptions.resizeMode = PHImageRequestOptionsResizeModeNone;
} else {
targetSize = CGSizeApplyAffineTransform(size, CGAffineTransformMakeScale(scale, scale));
imageOptions.resizeMode = PHImageRequestOptionsResizeModeFast;
}
PHImageContentMode contentMode = PHImageContentModeAspectFill;
if (resizeMode == RCTResizeModeContain) {
contentMode = PHImageContentModeAspectFit;
}
PHImageRequestOptionsVersion version = PHImageRequestOptionsVersionCurrent;
__block PHImageRequestOptionsDeliveryMode deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
imageOptions.deliveryMode = deliveryMode;
imageOptions.version = version;
if(imageURL.query != nil) {
NSURLComponents *urlComponents = [NSURLComponents componentsWithURL:imageURL
resolvingAgainstBaseURL:NO];
NSArray *queryItems = urlComponents.queryItems;
//DeliveryMode
NSString *deliveryModeQuery = [self valueForKey:@"deliveryMode"
fromQueryItems:queryItems];
if(deliveryModeQuery != nil) {
if([deliveryModeQuery isEqualToString:@"opportunistic"]) {
imageOptions.deliveryMode = PHImageRequestOptionsDeliveryModeOpportunistic;
}
else if([deliveryModeQuery isEqualToString:@"highQuality"]) {
imageOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
}
else if([deliveryModeQuery isEqualToString:@"fast"]) {
imageOptions.deliveryMode = PHImageRequestOptionsDeliveryModeFastFormat;
}
}
//Version
NSString *versionQuery = [self valueForKey:@"version"
fromQueryItems:queryItems];
if(versionQuery != nil) {
if([versionQuery isEqualToString:@"original"]) {
imageOptions.version = PHImageRequestOptionsVersionOriginal;
}
if([versionQuery isEqualToString:@"unadjusted"]) {
imageOptions.version = PHImageRequestOptionsVersionUnadjusted;
}
}
//ResizeMode
NSString *resizeModeQuery = [self valueForKey:@"resizeMode"
fromQueryItems:queryItems];
if(resizeModeQuery != nil) {
if([resizeModeQuery isEqualToString:@"none"]) {
imageOptions.resizeMode = PHImageRequestOptionsResizeModeNone;
}
if([resizeModeQuery isEqualToString:@"fast"]) {
imageOptions.resizeMode = PHImageRequestOptionsResizeModeFast;
}
if([resizeModeQuery isEqualToString:@"exact"]) {
imageOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
}
}
//ResizeMode
NSString *normalizedCropRectQuery = [self valueForKey:@"cropRect"
fromQueryItems:queryItems];
if(normalizedCropRectQuery != nil) {
NSArray<NSString *> * splittedRect = [normalizedCropRectQuery componentsSeparatedByString:@"|"];
float x = [splittedRect[0] floatValue];
float y = [splittedRect[1] floatValue];
float width = [splittedRect[2] floatValue];
float height = [splittedRect[3] floatValue];
CGRect cropRect = CGRectMake(x, y, width, height);
CGRect normalizedRect = CGRectApplyAffineTransform(cropRect,
CGAffineTransformMakeScale(1.0 / asset.pixelWidth,
1.0 / asset.pixelHeight));
imageOptions.normalizedCropRect = normalizedRect;
imageOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
targetSize = CGSizeApplyAffineTransform(CGSizeMake(width, height), CGAffineTransformMakeScale(scale, scale));
}
//ContentMode
NSString *contentModeQuery = [self valueForKey:@"contentMode"
fromQueryItems:queryItems];
if(contentModeQuery != nil) {
if([contentModeQuery isEqualToString:@"fit"]) {
contentMode = PHImageContentModeAspectFit;
}
if([contentModeQuery isEqualToString:@"fill"]) {
contentMode = PHImageContentModeAspectFill;
}
}
}
PHImageRequestID requestID =
[[PHCachingImageManagerInstance sharedCachingManager] requestImageForAsset:asset
targetSize:targetSize
contentMode:contentMode
options:imageOptions
resultHandler:^(UIImage *result, NSDictionary<NSString *, id> *info) {
if (result) {
if(deliveryMode == PHImageRequestOptionsDeliveryModeOpportunistic && [info[@"PHImageResultIsDegradedKey"] boolValue] == YES) {
if (partialLoadHandler) {
partialLoadHandler(result);
}
}else {
completionHandler(nil, result);
}
} else {
completionHandler(info[PHImageErrorKey], nil);
}
}];
return ^{
[[PHCachingImageManagerInstance sharedCachingManager] cancelImageRequest:requestID];
};
}
-(NSDictionary*)splitQuery:(NSString*)url {
NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
for (NSString *param in [url componentsSeparatedByString:@"&"]) {
NSArray *elts = [param componentsSeparatedByString:@"="];
if([elts count] < 2) continue;
[params setObject:[elts lastObject] forKey:[elts firstObject]];
}
return params;
}
- (NSString *)valueForKey:(NSString *)key
fromQueryItems:(NSArray *)queryItems
{
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name=%@", key];
NSURLQueryItem *queryItem = [[queryItems
filteredArrayUsingPredicate:predicate]
firstObject];
return queryItem.value;
}
@end