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TPTentHTTPClient.m
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TPTentHTTPClient.m
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//
// TPTentHTTPClient.m
//
// Copyright (c) 2012 Ben Stovold http://thoughtfulpixel.com
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#import "TPTentHTTPClient.h"
#import "AFJSONRequestOperation.h"
#import "NSURL+SSToolkitAdditions.h"
#import "UICKeyChainStore.h"
#import "NSURL+TPEquivalence.h"
#import <CommonCrypto/CommonHMAC.h>
#pragma mark - Functions and constants
static NSString *TPBase64EncodedStringFromData(NSData *data) {
NSUInteger length = [data length];
NSMutableData *mutableData = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
uint8_t *input = (uint8_t *)[data bytes];
uint8_t *output = (uint8_t *)[mutableData mutableBytes];
for (NSUInteger i = 0; i < length; i += 3) {
NSUInteger value = 0;
for (NSUInteger j = i; j < (i + 3); j++) {
value <<= 8;
if (j < length) {
value |= (0xFF & input[j]);
}
}
static uint8_t const kTPBase64EncodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
NSUInteger idx = (i / 3) * 4;
output[idx + 0] = kTPBase64EncodingTable[(value >> 18) & 0x3F];
output[idx + 1] = kTPBase64EncodingTable[(value >> 12) & 0x3F];
output[idx + 2] = (i + 1) < length ? kTPBase64EncodingTable[(value >> 6) & 0x3F] : '=';
output[idx + 3] = (i + 2) < length ? kTPBase64EncodingTable[(value >> 0) & 0x3F] : '=';
}
return [[NSString alloc] initWithData:mutableData encoding:NSASCIIStringEncoding];
}
static NSString *const kTPTentContentType = @"application/vnd.tent.v0+json";
#pragma mark - NSString extensions for HMACSHA256
@interface NSString (TPHMACSHA256Encoding)
+ (NSString *)HMACSHA256EncodedStringWithString:(NSString *)string key:(NSString *)key;
@end
@implementation NSString (TPHMACSHA256Encoding)
+ (NSString *)HMACSHA256EncodedStringWithString:(NSString *)string key:(NSString *)key;
{
const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
const char *cData = [string cStringUsingEncoding:NSUTF8StringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC length:CC_SHA256_DIGEST_LENGTH];
return TPBase64EncodedStringFromData(HMAC);
}
@end
#pragma mark
@interface TPTentHTTPClient ()
@property (nonatomic, strong) NSString *tentClientId;
@property (nonatomic, strong) NSString *tentState;
@property (nonatomic, strong) NSString *tentMacAlgorithm;
@property (nonatomic, strong) NSString *tentMacKeyId;
@property (nonatomic, strong) NSString *tentMacKey;
@property (nonatomic, strong) NSString *tentAccessToken;
@property (nonatomic, copy) void (^registrationSuccessBlock) ();
@property (nonatomic, copy) void (^registrationFailureBlock) (NSError *);
@end
#pragma mark
@implementation TPTentHTTPClient
#pragma mark - Lifecycle
- (id)initWithBaseURL:(NSURL *)url {
self = [super initWithBaseURL:url];
if (!self) {
return nil;
}
[self registerHTTPOperationClass:[AFJSONRequestOperation class]];
[self setParameterEncoding:AFJSONParameterEncoding];
[self setDefaultHeader:@"Accept" value:kTPTentContentType];
[AFJSONRequestOperation addAcceptableContentTypes:[NSSet setWithObject:kTPTentContentType]];
if ([url isEquivalent:[NSURL URLWithString:[UICKeyChainStore stringForKey:BASE_URL]]]) {
self.tentAccessToken = [UICKeyChainStore stringForKey:ACCESS_TOKEN];
self.tentMacKey = [UICKeyChainStore stringForKey:MAC_KEY];
self.tentMacAlgorithm = [UICKeyChainStore stringForKey:MAC_ALGORITHM];
self.tentMacKeyId = [UICKeyChainStore stringForKey:MAC_KEY_ID];
self.tentClientId = [UICKeyChainStore stringForKey:CLIENT_ID];
}
return self;
}
#pragma mark - AFHTTPClient
- (NSMutableURLRequest *)requestWithMethod:(NSString *)method path:(NSString *)path parameters:(NSDictionary *)parameters
{
NSMutableURLRequest *request = [super requestWithMethod:method path:path parameters:parameters];
if ([method isEqualToString:@"POST"]) {
[request setValue:kTPTentContentType forHTTPHeaderField:@"Content-Type"];
}
NSString *authorizationHeader = [self authorizationHeaderForRequest:request];
if (authorizationHeader) {
[request setValue:authorizationHeader forHTTPHeaderField:@"Authorization"];
}
return request;
}
#pragma mark - Public methods
- (BOOL)isRegisteredWithBaseURL
{
return self.tentAccessToken.length > 0;
}
- (void)registerForBaseURL
{
[self registerForBaseURLWithSuccess:nil failure:nil];
}
- (void)registerForBaseURLWithSuccess:(void (^)())success failure:(void (^)(NSError *))failure
{
self.registrationSuccessBlock = success;
self.registrationFailureBlock = failure;
if ([self isRegisteredWithBaseURL]) {
NSLog(@"Token found - skipping App registration");
return;
}
if (![self mainBundleContainsURLScheme:self.delegate.customURLScheme]) {
NSLog(@"Can't find a match for _customURLScheme in mainBundle");
return;
}
if (!self.baseURL) {
NSLog(@"Cannot register against an unspecified URI");
return;
}
self.tentState = [[[NSProcessInfo processInfo] globallyUniqueString] stringByReplacingOccurrencesOfString:@"-" withString:@""];
NSDictionary *params = @{@"name": self.delegate.appName,
@"description": self.delegate.appDescription,
@"url": [self.delegate.appWebsiteURL absoluteString],
@"redirect_uris": @[[NSString stringWithFormat:@"%@://oauth", self.delegate.customURLScheme]],
@"scopes": self.delegate.scopes};
NSMutableURLRequest *request = [self requestWithMethod:@"POST" path:@"apps" parameters:params];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
self.tentMacAlgorithm = JSON[MAC_ALGORITHM];
self.tentMacKey = JSON[MAC_KEY];
self.tentMacKeyId = JSON[MAC_KEY_ID];
self.tentClientId = JSON[@"id"];
NSDictionary *authRequestParams = @{
CLIENT_ID: self.tentClientId,
@"tent_profile_info_types": @"all",
@"tent_post_types": @"all",
@"redirect_uri": [NSString stringWithFormat:@"%@://oauth", self.delegate.customURLScheme],
@"scope": [[self.delegate.scopes allKeys] componentsJoinedByString:@","],
@"state": self.tentState};
NSString *authRequestURLString = [NSString stringWithFormat:@"%@%@%@", self.baseURL, @"/oauth/authorize?", AFQueryStringFromParametersWithEncoding(authRequestParams, NSUTF8StringEncoding)];
NSURL *authRequestURL = [NSURL URLWithString:authRequestURLString];
if (![[UIApplication sharedApplication] openURL:authRequestURL]) {
NSLog(@"%@%@",@"Failed to open url:",[authRequestURL description]);
}
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(@"Something went very wrong");
}];
[self enqueueHTTPRequestOperation:operation];
}
- (BOOL)handleOpenURL:(NSURL *)url
{
NSDictionary *queryDictionary = [url queryDictionary];
if (![self.tentState isEqualToString:queryDictionary[@"state"]]) {
return NO;
}
NSMutableURLRequest *request = [self requestWithMethod:@"POST"
path:[NSString stringWithFormat:@"apps/%@/authorizations", self.tentClientId]
parameters:@{@"code": queryDictionary[@"code"], @"token_type": @"mac"}];
__weak TPTentHTTPClient *weakSelf = self;
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
if (JSON[ACCESS_TOKEN]) {
weakSelf.tentAccessToken = JSON[ACCESS_TOKEN];
weakSelf.tentMacKey = JSON[MAC_KEY];
[UICKeyChainStore setString:[weakSelf.baseURL absoluteString] forKey:BASE_URL];
[UICKeyChainStore setString:weakSelf.tentAccessToken forKey:ACCESS_TOKEN];
[UICKeyChainStore setString:weakSelf.tentMacKey forKey:MAC_KEY];
[UICKeyChainStore setString:weakSelf.tentMacAlgorithm forKey:MAC_ALGORITHM];
[UICKeyChainStore setString:weakSelf.tentMacKeyId forKey:MAC_KEY_ID];
[UICKeyChainStore setString:weakSelf.tentClientId forKey:CLIENT_ID];
if ([weakSelf.delegate respondsToSelector:@selector(httpClientDidRegisterWithBaseURL:)]) {
[weakSelf.delegate httpClientDidRegisterWithBaseURL:self];
}
if (weakSelf.registrationSuccessBlock) {
weakSelf.registrationSuccessBlock();
}
}
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
if (weakSelf.registrationFailureBlock) {
weakSelf.registrationFailureBlock(error);
}
}];
[self enqueueHTTPRequestOperation:operation];
return YES;
}
#pragma mark - Private methods
- (NSString *)authorizationHeaderForRequest:(NSURLRequest *)request
{
if (self.tentAccessToken.length == 0 && self.tentMacKeyId.length == 0) {
return nil;
}
long secs = round([[NSDate date] timeIntervalSince1970]);
NSString *timeStamp = [NSString stringWithFormat:@"%ld", secs];
NSString *nonce = [[[NSProcessInfo processInfo] globallyUniqueString] stringByReplacingOccurrencesOfString:@"-" withString:@""];
// Create the normalised request string (http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-3.2.1)
NSMutableString *normalisedRequestString = [NSMutableString stringWithString:timeStamp];
[normalisedRequestString appendFormat:@"\n%@\n", nonce];
[normalisedRequestString appendFormat:@"%@\n", request.HTTPMethod];
[normalisedRequestString appendFormat:@"%@\n", request.URL.path];
[normalisedRequestString appendFormat:@"%@\n", request.URL.host];
NSString *port = [request.URL.port stringValue];
if (!port) {
port = ([request.URL.scheme isEqualToString:@"http"]) ? @"80" : @"443";
}
[normalisedRequestString appendFormat:@"%@\n\n", port];
NSString *mac = [NSString HMACSHA256EncodedStringWithString:normalisedRequestString key:self.tentMacKey];
NSString *authorizationId = (self.tentAccessToken.length > 0) ? self.tentAccessToken : self.tentMacKeyId;
return [NSString stringWithFormat:@"MAC id=\"%@\", ts=\"%@\", nonce=\"%@\", mac=\"%@\"", authorizationId, timeStamp, nonce, mac];
}
- (BOOL)mainBundleContainsURLScheme:(NSString *)urlScheme
{
if (self.delegate.customURLScheme.length == 0) {
return NO;
}
NSArray *types = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"CFBundleURLTypes"];
for (id type in types) {
if ([type isKindOfClass:[NSDictionary class]]) {
NSArray *schemes = [type valueForKey:@"CFBundleURLSchemes"];
for (id scheme in schemes) {
if ([scheme isEqualToString:urlScheme]) {
return YES;
}
}
}
}
return NO;
}
@end