From 7b02207537d35bfa1714bf8beafc921f717d100a Mon Sep 17 00:00:00 2001
From: 单军华
Date: Wed, 11 Jul 2018 10:47:42 +0800
Subject: [PATCH] 首次上传
---
screendisplay/Pods/ASIHTTPRequest/Classes/ASIDownloadCache.m | 514 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 514 insertions(+), 0 deletions(-)
diff --git a/screendisplay/Pods/ASIHTTPRequest/Classes/ASIDownloadCache.m b/screendisplay/Pods/ASIHTTPRequest/Classes/ASIDownloadCache.m
new file mode 100755
index 0000000..93da36f
--- /dev/null
+++ b/screendisplay/Pods/ASIHTTPRequest/Classes/ASIDownloadCache.m
@@ -0,0 +1,514 @@
+//
+// ASIDownloadCache.m
+// Part of ASIHTTPRequest -> http://allseeing-i.com/ASIHTTPRequest
+//
+// Created by Ben Copsey on 01/05/2010.
+// Copyright 2010 All-Seeing Interactive. All rights reserved.
+//
+
+#import "ASIDownloadCache.h"
+#import "ASIHTTPRequest.h"
+#import <CommonCrypto/CommonHMAC.h>
+
+static ASIDownloadCache *sharedCache = nil;
+
+static NSString *sessionCacheFolder = @"SessionStore";
+static NSString *permanentCacheFolder = @"PermanentStore";
+static NSArray *fileExtensionsToHandleAsHTML = nil;
+
+@interface ASIDownloadCache ()
++ (NSString *)keyForURL:(NSURL *)url;
+- (NSString *)pathToFile:(NSString *)file;
+@end
+
+@implementation ASIDownloadCache
+
++ (void)initialize
+{
+ if (self == [ASIDownloadCache class]) {
+ // Obviously this is not an exhaustive list, but hopefully these are the most commonly used and this will 'just work' for the widest range of people
+ // I imagine many web developers probably use url rewriting anyway
+ fileExtensionsToHandleAsHTML = [[NSArray alloc] initWithObjects:@"asp",@"aspx",@"jsp",@"php",@"rb",@"py",@"pl",@"cgi", nil];
+ }
+}
+
+- (id)init
+{
+ self = [super init];
+ [self setShouldRespectCacheControlHeaders:YES];
+ [self setDefaultCachePolicy:ASIUseDefaultCachePolicy];
+ [self setAccessLock:[[[NSRecursiveLock alloc] init] autorelease]];
+ return self;
+}
+
++ (id)sharedCache
+{
+ if (!sharedCache) {
+ @synchronized(self) {
+ if (!sharedCache) {
+ sharedCache = [[self alloc] init];
+ [sharedCache setStoragePath:[[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"ASIHTTPRequestCache"]];
+ }
+ }
+ }
+ return sharedCache;
+}
+
+- (void)dealloc
+{
+ [storagePath release];
+ [accessLock release];
+ [super dealloc];
+}
+
+- (NSString *)storagePath
+{
+ [[self accessLock] lock];
+ NSString *p = [[storagePath retain] autorelease];
+ [[self accessLock] unlock];
+ return p;
+}
+
+
+- (void)setStoragePath:(NSString *)path
+{
+ [[self accessLock] lock];
+ [self clearCachedResponsesForStoragePolicy:ASICacheForSessionDurationCacheStoragePolicy];
+ [storagePath release];
+ storagePath = [path retain];
+
+ NSFileManager *fileManager = [[[NSFileManager alloc] init] autorelease];
+
+ BOOL isDirectory = NO;
+ NSArray *directories = [NSArray arrayWithObjects:path,[path stringByAppendingPathComponent:sessionCacheFolder],[path stringByAppendingPathComponent:permanentCacheFolder],nil];
+ for (NSString *directory in directories) {
+ BOOL exists = [fileManager fileExistsAtPath:directory isDirectory:&isDirectory];
+ if (exists && !isDirectory) {
+ [[self accessLock] unlock];
+ [NSException raise:@"FileExistsAtCachePath" format:@"Cannot create a directory for the cache at '%@', because a file already exists",directory];
+ } else if (!exists) {
+ [fileManager createDirectoryAtPath:directory withIntermediateDirectories:NO attributes:nil error:nil];
+ if (![fileManager fileExistsAtPath:directory]) {
+ [[self accessLock] unlock];
+ [NSException raise:@"FailedToCreateCacheDirectory" format:@"Failed to create a directory for the cache at '%@'",directory];
+ }
+ }
+ }
+ [self clearCachedResponsesForStoragePolicy:ASICacheForSessionDurationCacheStoragePolicy];
+ [[self accessLock] unlock];
+}
+
+- (void)updateExpiryForRequest:(ASIHTTPRequest *)request maxAge:(NSTimeInterval)maxAge
+{
+ NSString *headerPath = [self pathToStoreCachedResponseHeadersForRequest:request];
+ NSMutableDictionary *cachedHeaders = [NSMutableDictionary dictionaryWithContentsOfFile:headerPath];
+ if (!cachedHeaders) {
+ return;
+ }
+ NSDate *expires = [self expiryDateForRequest:request maxAge:maxAge];
+ if (!expires) {
+ return;
+ }
+ [cachedHeaders setObject:[NSNumber numberWithDouble:[expires timeIntervalSince1970]] forKey:@"X-ASIHTTPRequest-Expires"];
+ [cachedHeaders writeToFile:headerPath atomically:NO];
+}
+
+- (NSDate *)expiryDateForRequest:(ASIHTTPRequest *)request maxAge:(NSTimeInterval)maxAge
+{
+ return [ASIHTTPRequest expiryDateForRequest:request maxAge:maxAge];
+}
+
+- (void)storeResponseForRequest:(ASIHTTPRequest *)request maxAge:(NSTimeInterval)maxAge
+{
+ [[self accessLock] lock];
+
+ if ([request error] || ![request responseHeaders] || ([request cachePolicy] & ASIDoNotWriteToCacheCachePolicy)) {
+ [[self accessLock] unlock];
+ return;
+ }
+
+ // We only cache 200/OK or redirect reponses (redirect responses are cached so the cache works better with no internet connection)
+ int responseCode = [request responseStatusCode];
+ if (responseCode != 200 && responseCode != 301 && responseCode != 302 && responseCode != 303 && responseCode != 307) {
+ [[self accessLock] unlock];
+ return;
+ }
+
+ if ([self shouldRespectCacheControlHeaders] && ![[self class] serverAllowsResponseCachingForRequest:request]) {
+ [[self accessLock] unlock];
+ return;
+ }
+
+ NSString *headerPath = [self pathToStoreCachedResponseHeadersForRequest:request];
+ NSString *dataPath = [self pathToStoreCachedResponseDataForRequest:request];
+
+ NSMutableDictionary *responseHeaders = [NSMutableDictionary dictionaryWithDictionary:[request responseHeaders]];
+ if ([request isResponseCompressed]) {
+ [responseHeaders removeObjectForKey:@"Content-Encoding"];
+ }
+
+ // Create a special 'X-ASIHTTPRequest-Expires' header
+ // This is what we use for deciding if cached data is current, rather than parsing the expires / max-age headers individually each time
+ // We store this as a timestamp to make reading it easier as NSDateFormatter is quite expensive
+
+ NSDate *expires = [self expiryDateForRequest:request maxAge:maxAge];
+ if (expires) {
+ [responseHeaders setObject:[NSNumber numberWithDouble:[expires timeIntervalSince1970]] forKey:@"X-ASIHTTPRequest-Expires"];
+ }
+
+ // Store the response code in a custom header so we can reuse it later
+
+ // We'll change 304/Not Modified to 200/OK because this is likely to be us updating the cached headers with a conditional GET
+ int statusCode = [request responseStatusCode];
+ if (statusCode == 304) {
+ statusCode = 200;
+ }
+ [responseHeaders setObject:[NSNumber numberWithInt:statusCode] forKey:@"X-ASIHTTPRequest-Response-Status-Code"];
+
+ [responseHeaders writeToFile:headerPath atomically:NO];
+
+ if ([request responseData]) {
+ [[request responseData] writeToFile:dataPath atomically:NO];
+ } else if ([request downloadDestinationPath] && ![[request downloadDestinationPath] isEqualToString:dataPath]) {
+ NSError *error = nil;
+ NSFileManager* manager = [[NSFileManager alloc] init];
+ if ([manager fileExistsAtPath:dataPath]) {
+ [manager removeItemAtPath:dataPath error:&error];
+ }
+ [manager copyItemAtPath:[request downloadDestinationPath] toPath:dataPath error:&error];
+ [manager release];
+ }
+ [[self accessLock] unlock];
+}
+
+- (NSDictionary *)cachedResponseHeadersForURL:(NSURL *)url
+{
+ NSString *path = [self pathToCachedResponseHeadersForURL:url];
+ if (path) {
+ return [NSDictionary dictionaryWithContentsOfFile:path];
+ }
+ return nil;
+}
+
+- (NSData *)cachedResponseDataForURL:(NSURL *)url
+{
+ NSString *path = [self pathToCachedResponseDataForURL:url];
+ if (path) {
+ return [NSData dataWithContentsOfFile:path];
+ }
+ return nil;
+}
+
+- (NSString *)pathToCachedResponseDataForURL:(NSURL *)url
+{
+ // Grab the file extension, if there is one. We do this so we can save the cached response with the same file extension - this is important if you want to display locally cached data in a web view
+ NSString *extension = [[url path] pathExtension];
+
+ // If the url doesn't have an extension, we'll add one so a webview can read it when locally cached
+ // If the url has the extension of a common web scripting language, we'll change the extension on the cached path to html for the same reason
+ if (![extension length] || [[[self class] fileExtensionsToHandleAsHTML] containsObject:[extension lowercaseString]]) {
+ extension = @"html";
+ }
+ return [self pathToFile:[[[self class] keyForURL:url] stringByAppendingPathExtension:extension]];
+}
+
++ (NSArray *)fileExtensionsToHandleAsHTML
+{
+ return fileExtensionsToHandleAsHTML;
+}
+
+
+- (NSString *)pathToCachedResponseHeadersForURL:(NSURL *)url
+{
+ return [self pathToFile:[[[self class] keyForURL:url] stringByAppendingPathExtension:@"cachedheaders"]];
+}
+
+- (NSString *)pathToFile:(NSString *)file
+{
+ [[self accessLock] lock];
+ if (![self storagePath]) {
+ [[self accessLock] unlock];
+ return nil;
+ }
+
+ NSFileManager *fileManager = [[[NSFileManager alloc] init] autorelease];
+
+ // Look in the session store
+ NSString *dataPath = [[[self storagePath] stringByAppendingPathComponent:sessionCacheFolder] stringByAppendingPathComponent:file];
+ if ([fileManager fileExistsAtPath:dataPath]) {
+ [[self accessLock] unlock];
+ return dataPath;
+ }
+ // Look in the permanent store
+ dataPath = [[[self storagePath] stringByAppendingPathComponent:permanentCacheFolder] stringByAppendingPathComponent:file];
+ if ([fileManager fileExistsAtPath:dataPath]) {
+ [[self accessLock] unlock];
+ return dataPath;
+ }
+ [[self accessLock] unlock];
+ return nil;
+}
+
+
+- (NSString *)pathToStoreCachedResponseDataForRequest:(ASIHTTPRequest *)request
+{
+ [[self accessLock] lock];
+ if (![self storagePath]) {
+ [[self accessLock] unlock];
+ return nil;
+ }
+
+ NSString *path = [[self storagePath] stringByAppendingPathComponent:([request cacheStoragePolicy] == ASICacheForSessionDurationCacheStoragePolicy ? sessionCacheFolder : permanentCacheFolder)];
+
+ // Grab the file extension, if there is one. We do this so we can save the cached response with the same file extension - this is important if you want to display locally cached data in a web view
+ NSString *extension = [[[request url] path] pathExtension];
+
+ // If the url doesn't have an extension, we'll add one so a webview can read it when locally cached
+ // If the url has the extension of a common web scripting language, we'll change the extension on the cached path to html for the same reason
+ if (![extension length] || [[[self class] fileExtensionsToHandleAsHTML] containsObject:[extension lowercaseString]]) {
+ extension = @"html";
+ }
+ path = [path stringByAppendingPathComponent:[[[self class] keyForURL:[request url]] stringByAppendingPathExtension:extension]];
+ [[self accessLock] unlock];
+ return path;
+}
+
+- (NSString *)pathToStoreCachedResponseHeadersForRequest:(ASIHTTPRequest *)request
+{
+ [[self accessLock] lock];
+ if (![self storagePath]) {
+ [[self accessLock] unlock];
+ return nil;
+ }
+ NSString *path = [[self storagePath] stringByAppendingPathComponent:([request cacheStoragePolicy] == ASICacheForSessionDurationCacheStoragePolicy ? sessionCacheFolder : permanentCacheFolder)];
+ path = [path stringByAppendingPathComponent:[[[self class] keyForURL:[request url]] stringByAppendingPathExtension:@"cachedheaders"]];
+ [[self accessLock] unlock];
+ return path;
+}
+
+- (void)removeCachedDataForURL:(NSURL *)url
+{
+ [[self accessLock] lock];
+ if (![self storagePath]) {
+ [[self accessLock] unlock];
+ return;
+ }
+ NSFileManager *fileManager = [[[NSFileManager alloc] init] autorelease];
+
+ NSString *path = [self pathToCachedResponseHeadersForURL:url];
+ if (path) {
+ [fileManager removeItemAtPath:path error:NULL];
+ }
+
+ path = [self pathToCachedResponseDataForURL:url];
+ if (path) {
+ [fileManager removeItemAtPath:path error:NULL];
+ }
+ [[self accessLock] unlock];
+}
+
+- (void)removeCachedDataForRequest:(ASIHTTPRequest *)request
+{
+ [self removeCachedDataForURL:[request url]];
+}
+
+- (BOOL)isCachedDataCurrentForRequest:(ASIHTTPRequest *)request
+{
+ [[self accessLock] lock];
+ if (![self storagePath]) {
+ [[self accessLock] unlock];
+ return NO;
+ }
+ NSDictionary *cachedHeaders = [self cachedResponseHeadersForURL:[request url]];
+ if (!cachedHeaders) {
+ [[self accessLock] unlock];
+ return NO;
+ }
+ NSString *dataPath = [self pathToCachedResponseDataForURL:[request url]];
+ if (!dataPath) {
+ [[self accessLock] unlock];
+ return NO;
+ }
+
+ // New content is not different
+ if ([request responseStatusCode] == 304) {
+ [[self accessLock] unlock];
+ return YES;
+ }
+
+ // If we already have response headers for this request, check to see if the new content is different
+ // We check [request complete] so that we don't end up comparing response headers from a redirection with these
+ if ([request responseHeaders] && [request complete]) {
+
+ // If the Etag or Last-Modified date are different from the one we have, we'll have to fetch this resource again
+ NSArray *headersToCompare = [NSArray arrayWithObjects:@"Etag",@"Last-Modified",nil];
+ for (NSString *header in headersToCompare) {
+ if (![[[request responseHeaders] objectForKey:header] isEqualToString:[cachedHeaders objectForKey:header]]) {
+ [[self accessLock] unlock];
+ return NO;
+ }
+ }
+ }
+
+ if ([self shouldRespectCacheControlHeaders]) {
+
+ // Look for X-ASIHTTPRequest-Expires header to see if the content is out of date
+ NSNumber *expires = [cachedHeaders objectForKey:@"X-ASIHTTPRequest-Expires"];
+ if (expires) {
+ if ([[NSDate dateWithTimeIntervalSince1970:[expires doubleValue]] timeIntervalSinceNow] >= 0) {
+ [[self accessLock] unlock];
+ return YES;
+ }
+ }
+
+ // No explicit expiration time sent by the server
+ [[self accessLock] unlock];
+ return NO;
+ }
+
+
+ [[self accessLock] unlock];
+ return YES;
+}
+
+- (ASICachePolicy)defaultCachePolicy
+{
+ [[self accessLock] lock];
+ ASICachePolicy cp = defaultCachePolicy;
+ [[self accessLock] unlock];
+ return cp;
+}
+
+
+- (void)setDefaultCachePolicy:(ASICachePolicy)cachePolicy
+{
+ [[self accessLock] lock];
+ if (!cachePolicy) {
+ defaultCachePolicy = ASIAskServerIfModifiedWhenStaleCachePolicy;
+ } else {
+ defaultCachePolicy = cachePolicy;
+ }
+ [[self accessLock] unlock];
+}
+
+- (void)clearCachedResponsesForStoragePolicy:(ASICacheStoragePolicy)storagePolicy
+{
+ [[self accessLock] lock];
+ if (![self storagePath]) {
+ [[self accessLock] unlock];
+ return;
+ }
+ NSString *path = [[self storagePath] stringByAppendingPathComponent:(storagePolicy == ASICacheForSessionDurationCacheStoragePolicy ? sessionCacheFolder : permanentCacheFolder)];
+
+ NSFileManager *fileManager = [[[NSFileManager alloc] init] autorelease];
+
+ BOOL isDirectory = NO;
+ BOOL exists = [fileManager fileExistsAtPath:path isDirectory:&isDirectory];
+ if (!exists || !isDirectory) {
+ [[self accessLock] unlock];
+ return;
+ }
+ NSError *error = nil;
+ NSArray *cacheFiles = [fileManager contentsOfDirectoryAtPath:path error:&error];
+ if (error) {
+ [[self accessLock] unlock];
+ [NSException raise:@"FailedToTraverseCacheDirectory" format:@"Listing cache directory failed at path '%@'",path];
+ }
+ for (NSString *file in cacheFiles) {
+ [fileManager removeItemAtPath:[path stringByAppendingPathComponent:file] error:&error];
+ if (error) {
+ [[self accessLock] unlock];
+ [NSException raise:@"FailedToRemoveCacheFile" format:@"Failed to remove cached data at path '%@'",path];
+ }
+ }
+ [[self accessLock] unlock];
+}
+
++ (BOOL)serverAllowsResponseCachingForRequest:(ASIHTTPRequest *)request
+{
+ NSString *cacheControl = [[[request responseHeaders] objectForKey:@"Cache-Control"] lowercaseString];
+ if (cacheControl) {
+ if ([cacheControl isEqualToString:@"no-cache"] || [cacheControl isEqualToString:@"no-store"]) {
+ return NO;
+ }
+ }
+ NSString *pragma = [[[request responseHeaders] objectForKey:@"Pragma"] lowercaseString];
+ if (pragma) {
+ if ([pragma isEqualToString:@"no-cache"]) {
+ return NO;
+ }
+ }
+ return YES;
+}
+
++ (NSString *)keyForURL:(NSURL *)url
+{
+ NSString *urlString = [url absoluteString];
+ if ([urlString length] == 0) {
+ return nil;
+ }
+
+ // Strip trailing slashes so http://allseeing-i.com/ASIHTTPRequest/ is cached the same as http://allseeing-i.com/ASIHTTPRequest
+ if ([[urlString substringFromIndex:[urlString length]-1] isEqualToString:@"/"]) {
+ urlString = [urlString substringToIndex:[urlString length]-1];
+ }
+
+ // Borrowed from: http://stackoverflow.com/questions/652300/using-md5-hash-on-a-string-in-cocoa
+ const char *cStr = [urlString UTF8String];
+ unsigned char result[16];
+ CC_MD5(cStr, (CC_LONG)strlen(cStr), result);
+ return [NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7],result[8], result[9], result[10], result[11],result[12], result[13], result[14], result[15]];
+}
+
+- (BOOL)canUseCachedDataForRequest:(ASIHTTPRequest *)request
+{
+ // Ensure the request is allowed to read from the cache
+ if ([request cachePolicy] & ASIDoNotReadFromCacheCachePolicy) {
+ return NO;
+
+ // If we don't want to load the request whatever happens, always pretend we have cached data even if we don't
+ } else if ([request cachePolicy] & ASIDontLoadCachePolicy) {
+ return YES;
+ }
+
+ NSDictionary *headers = [self cachedResponseHeadersForURL:[request url]];
+ if (!headers) {
+ return NO;
+ }
+ NSString *dataPath = [self pathToCachedResponseDataForURL:[request url]];
+ if (!dataPath) {
+ return NO;
+ }
+
+ // If we get here, we have cached data
+
+ // If we have cached data, we can use it
+ if ([request cachePolicy] & ASIOnlyLoadIfNotCachedCachePolicy) {
+ return YES;
+
+ // If we want to fallback to the cache after an error
+ } else if ([request complete] && [request cachePolicy] & ASIFallbackToCacheIfLoadFailsCachePolicy) {
+ return YES;
+
+ // If we have cached data that is current, we can use it
+ } else if ([request cachePolicy] & ASIAskServerIfModifiedWhenStaleCachePolicy) {
+ if ([self isCachedDataCurrentForRequest:request]) {
+ return YES;
+ }
+
+ // If we've got headers from a conditional GET and the cached data is still current, we can use it
+ } else if ([request cachePolicy] & ASIAskServerIfModifiedCachePolicy) {
+ if (![request responseHeaders]) {
+ return NO;
+ } else if ([self isCachedDataCurrentForRequest:request]) {
+ return YES;
+ }
+ }
+ return NO;
+}
+
+@synthesize storagePath;
+@synthesize defaultCachePolicy;
+@synthesize accessLock;
+@synthesize shouldRespectCacheControlHeaders;
+@end
--
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