adding pods method of package managing

Pods/AppAuth/Source/AppAuthCore/OIDIDToken.m

@@ -0,0 +1,149 @@
+/*! @file OIDIDToken.m
+    @brief AppAuth iOS SDK
+    @copyright
+        Copyright 2017 Google Inc. All Rights Reserved.
+    @copydetails
+        Licensed under the Apache License, Version 2.0 (the "License");
+        you may not use this file except in compliance with the License.
+        You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+        Unless required by applicable law or agreed to in writing, software
+        distributed under the License is distributed on an "AS IS" BASIS,
+        WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+        See the License for the specific language governing permissions and
+        limitations under the License.
+ */
+
+#import "OIDIDToken.h"
+
+/*! Field keys associated with an ID Token. */
+static NSString *const kIssKey = @"iss";
+static NSString *const kSubKey = @"sub";
+static NSString *const kAudKey = @"aud";
+static NSString *const kExpKey = @"exp";
+static NSString *const kIatKey = @"iat";
+static NSString *const kNonceKey = @"nonce";
+
+#import "OIDFieldMapping.h"
+
+@implementation OIDIDToken
+
+- (instancetype)initWithIDTokenString:(NSString *)idToken {
+  self = [super init];
+  NSArray *sections = [idToken componentsSeparatedByString:@"."];
+  
+  // The header and claims sections are required.
+  if (sections.count <= 1) {
+    return nil;
+  }
+  
+  _header = [[self class] parseJWTSection:sections[0]];
+  _claims = [[self class] parseJWTSection:sections[1]];
+  if (!_header || !_claims) {
+    return nil;
+  }
+
+  [OIDFieldMapping remainingParametersWithMap:[[self class] fieldMap]
+                                   parameters:_claims
+                                     instance:self];
+
+  // Required fields.
+  if (!_issuer || !_audience || !_subject || !_expiresAt || !_issuedAt) {
+    return nil;
+  }
+
+  return self;
+}
+
+/*! @brief Returns a mapping of incoming parameters to instance variables.
+    @return A mapping of incoming parameters to instance variables.
+ */
++ (NSDictionary<NSString *, OIDFieldMapping *> *)fieldMap {
+  static NSMutableDictionary<NSString *, OIDFieldMapping *> *fieldMap;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    fieldMap = [NSMutableDictionary dictionary];
+
+    fieldMap[kIssKey] =
+        [[OIDFieldMapping alloc] initWithName:@"_issuer"
+                                         type:[NSURL class]
+                                   conversion:[OIDFieldMapping URLConversion]];
+    fieldMap[kSubKey] =
+        [[OIDFieldMapping alloc] initWithName:@"_subject" type:[NSString class]];
+    fieldMap[kAudKey] =
+        [[OIDFieldMapping alloc] initWithName:@"_audience"
+                                         type:[NSArray class]
+                                   conversion:^id _Nullable(NSObject *_Nullable value) {
+          if ([value isKindOfClass:[NSArray class]]) {
+            return value;
+          }
+          if ([value isKindOfClass:[NSString class]]) {
+            return @[value];
+          }
+          return nil;
+        }];
+    fieldMap[kExpKey] =
+        [[OIDFieldMapping alloc] initWithName:@"_expiresAt"
+                                         type:[NSDate class]
+                                   conversion:^id _Nullable(NSObject *_Nullable value) {
+          if (![value isKindOfClass:[NSNumber class]]) {
+            return value;
+          }
+          NSNumber *valueAsNumber = (NSNumber *)value;
+          return [NSDate dateWithTimeIntervalSince1970:valueAsNumber.longLongValue];
+        }];
+    fieldMap[kIatKey] =
+        [[OIDFieldMapping alloc] initWithName:@"_issuedAt"
+                                         type:[NSDate class]
+                                   conversion:^id _Nullable(NSObject *_Nullable value) {
+          if (![value isKindOfClass:[NSNumber class]]) {
+            return value;
+          }
+          NSNumber *valueAsNumber = (NSNumber *)value;
+          return [NSDate dateWithTimeIntervalSince1970:valueAsNumber.longLongValue];
+        }];
+    fieldMap[kNonceKey] =
+        [[OIDFieldMapping alloc] initWithName:@"_nonce" type:[NSString class]];
+  });
+  return fieldMap;
+}
+
++ (NSDictionary *)parseJWTSection:(NSString *)sectionString {
+  NSData *decodedData = [[self class] base64urlNoPaddingDecode:sectionString];
+
+  // Parses JSON.
+  NSError *error;
+  id object = [NSJSONSerialization JSONObjectWithData:decodedData options:0 error:&error];
+  if (error) {
+    NSLog(@"Error %@ parsing token payload %@", error, sectionString);
+  }
+  if ([object isKindOfClass:[NSDictionary class]]) {
+    return (NSDictionary *)object;
+  }
+
+  return nil;
+}
+
++ (NSData *)base64urlNoPaddingDecode:(NSString *)base64urlNoPaddingString {
+    NSMutableString *body = [base64urlNoPaddingString mutableCopy];
+
+    // Converts base64url to base64.
+    NSRange range = NSMakeRange(0, base64urlNoPaddingString.length);
+    [body replaceOccurrencesOfString:@"-" withString:@"+" options:NSLiteralSearch range:range];
+    [body replaceOccurrencesOfString:@"_" withString:@"/" options:NSLiteralSearch range:range];
+
+    // Converts base64 no padding to base64 with padding
+    while (body.length % 4 != 0) {
+      [body appendString:@"="];
+    }
+
+    // Decodes base64 string.
+    NSData *decodedData = [[NSData alloc] initWithBase64EncodedString:body options:0];
+    return decodedData;
+}
+
+@end
+
+