arq_restore/cocoastack/remotefs/S3RemoteFS.m

/*
 Copyright (c) 2009-2014, Stefan Reitshamer http://www.haystacksoftware.com
 
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 
 * Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
 
 * Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
 
 * Neither the names of PhotoMinds LLC or Haystack Software, nor the names of
 their contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "S3RemoteFS.h"
#import "Target.h"
#import "S3AuthorizationProvider.h"
#import "S3Service.h"
#import "NSString_extra.h"
#import "S3ObjectMetadata.h"


@implementation S3RemoteFS
- (id)initWithTarget:(Target *)theTarget {
    if (self = [super init]) {
        target = [theTarget retain];
    }
    return self;
}
- (void)dealloc {
    [target release];
    [s3 release];
    [super dealloc];
}


#pragma mark RemoteFS
- (NSString *)errorDomain {
    return @"RemoteFSErrorDomain";
}
- (NSNumber *)fileExistsAtPath:(NSString *)thePath isDirectory:(BOOL *)isDirectory targetConnectionDelegate:(id<TargetConnectionDelegate>)theTCD error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    thePath = [thePath stringByDeletingTrailingSlash];
    
    NSNumber *ret = [s3 containsObjectAtPath:thePath dataSize:NULL targetConnectionDelegate:theTCD error:error];
    if (ret == nil) {
        return nil;
    }
    if (isDirectory != NULL) {
        NSString *dir = [thePath stringByAppendingString:@"/"];
        NSArray *prefixes = [s3 commonPrefixesForPathPrefix:dir delimiter:@"/" targetConnectionDelegate:theTCD error:error];
        if (prefixes == nil) {
            return nil;
        }
        *isDirectory = [prefixes count] > 0; //FIXME: Does this work?! Never been tested!
    }
    return ret;
}
- (NSNumber *)fileExistsAtPath:(NSString *)thePath dataSize:(unsigned long long *)theDataSize targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    return [s3 containsObjectAtPath:thePath dataSize:theDataSize targetConnectionDelegate:theDelegate error:error];
}
- (NSArray *)contentsOfDirectoryAtPath:(NSString *)thePath targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    if (![thePath hasSuffix:@"/"]) {
        thePath = [thePath stringByAppendingString:@"/"];
    }
    return [s3 commonPrefixesForPathPrefix:thePath delimiter:@"/" targetConnectionDelegate:theDelegate error:error];
}
- (NSData *)contentsOfFileAtPath:(NSString *)thePath dataTransferDelegate:(id<DataTransferDelegate>)theDTDelegate targetConnectionDelegate:(id<TargetConnectionDelegate>)theTCDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    return [s3 dataAtPath:thePath dataTransferDelegate:theDTDelegate targetConnectionDelegate:theTCDelegate error:error];
}
- (BOOL)writeData:(NSData *)theData atomicallyToFileAtPath:(NSString *)thePath dataTransferDelegate:(id<DataTransferDelegate>)theDTDelegate targetConnectionDelegate:(id<TargetConnectionDelegate>)theTCDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return NO;
    }
    return [s3 putData:theData atPath:thePath dataTransferDelegate:theDTDelegate targetConnectionDelegate:theTCDelegate error:error];
}
- (BOOL)removeItemAtPath:(NSString *)thePath targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return NO;
    }
    return [s3 deletePath:thePath targetConnectionDelegate:theDelegate error:error];
}
- (BOOL)createDirectoryAtPath:(NSString *)path withIntermediateDirectories:(BOOL)createIntermediates targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    return YES;
}
- (NSNumber *)sizeOfItemAtPath:(NSString *)thePath targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    NSArray *objects = [s3 objectsWithPrefix:thePath targetConnectionDelegate:theDelegate error:error];
    if (objects == nil) {
        return nil;
    }
    unsigned long long total = 0;
    for (S3ObjectMetadata *md in objects) {
        total += [md size];
    }
    return [NSNumber numberWithUnsignedLongLong:total];
}
- (NSArray *)objectsAtPath:(NSString *)thePath targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    return [s3 objectsWithPrefix:thePath targetConnectionDelegate:theDelegate error:error];
}
- (NSArray *)pathsOfObjectsAtPath:(NSString *)thePath targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    return [s3 pathsWithPrefix:thePath delimiter:nil targetConnectionDelegate:theDelegate error:error];
}
- (NSNumber *)isObjectRestoredAtPath:(NSString *)thePath targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    return [s3 isObjectRestoredAtPath:thePath targetConnectionDelegate:theDelegate error:error];
}
- (BOOL)restoreObjectAtPath:(NSString *)thePath forDays:(NSUInteger)theDays alreadyRestoredOrRestoring:(BOOL *)alreadyRestoredOrRestoring targetConnectionDelegate:(id<TargetConnectionDelegate>)theDelegate error:(NSError **)error {
    if (![self setUp:error]) {
        return nil;
    }
    return [s3 restoreObjectAtPath:thePath forDays:theDays alreadyRestoredOrRestoring:alreadyRestoredOrRestoring targetConnectionDelegate:theDelegate error:error];
}


#pragma mark internal
- (BOOL)setUp:(NSError **)error {
    if (s3 == nil) {
        NSString *secret = [target secret:error];
        if (secret == nil) {
            return NO;
        }
        S3AuthorizationProvider *sap = [[[S3AuthorizationProvider alloc] initWithAccessKey:[[target endpoint] user] secretKey:secret] autorelease];
        NSString *portString = @"";
        if ([[[target endpoint] port] intValue] != 0) {
            portString = [NSString stringWithFormat:@":%d", [[[target endpoint] port] intValue]];
        }
        NSURL *s3Endpoint = [NSURL URLWithString:[NSString stringWithFormat:@"%@://%@%@", [[target endpoint] scheme], [[target endpoint] host], portString]];
        s3 = [[S3Service alloc] initWithS3AuthorizationProvider:sap endpoint:s3Endpoint useAmazonRRS:NO];
    }
    return YES;
}
@end