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diff --git a/Firebase/Storage/FIRStorageConstants.m b/Firebase/Storage/FIRStorageConstants.m
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+++ b/Firebase/Storage/FIRStorageConstants.m
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+// Copyright 2017 Google
+//
+// 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 "FIRStorageConstants.h"
+
+#import "FIRStorageConstants_Private.h"
+
+NSString *const kGCSScheme = @"https";
+NSString *const kGCSHost = @"www.googleapis.com";
+NSString *const kGCSUploadPath = @"upload";
+NSString *const kGCSStorageVersionPath = @"storage/v1";
+NSString *const kGCSBucketPathFormat = @"b/%@";
+NSString *const kGCSObjectPathFormat = @"o/%@";
+
+NSString *const kFIRStorageScheme = @"https";
+NSString *const kFIRStorageHost = @"firebasestorage.googleapis.com";
+NSString *const kFIRStorageVersionPath = @"v0";
+NSString *const kFIRStorageBucketPathFormat = @"b/%@";
+NSString *const kFIRStorageObjectPathFormat = @"o/%@";
+NSString *const kFIRStorageFullPathFormat = @"/v0/b/%@/o/%@";
+
+NSString *const kFIRStorageAuthTokenFormat = @"Firebase %@";
+NSString *const kFIRStorageDefaultBucketFormat = @"gs://%@";
+
+NSString *const kFIRStorageResponseErrorDomain = @"ResponseErrorDomain";
+NSString *const kFIRStorageResponseErrorCode = @"ResponseErrorCode";
+NSString *const kFIRStorageResponseBody = @"ResponseBody";
+
+NSString *const FIRStorageErrorDomain = @"FIRStorageErrorDomain";
+
+NSString *const kFIRStorageInvalidDataFormat = @"Invalid data returned from the server: %@";
+NSString *const kFIRStorageInvalidObserverStatus = @"Invalid observer status requested, use one "
+    @"of: FIRStorageTaskStatusPause, Resume, Progress, " @"Complete, or Failure";
+
+/**
+ * String constants mapping GCS Object#resource mappings to metadata fields.
+ */
+NSString *const kFIRStorageMetadataBucket = @"bucket";
+NSString *const kFIRStorageMetadataCacheControl = @"cacheControl";
+NSString *const kFIRStorageMetadataContentDisposition = @"contentDisposition";
+NSString *const kFIRStorageMetadataContentEncoding = @"contentEncoding";
+NSString *const kFIRStorageMetadataContentLanguage = @"contentLanguage";
+NSString *const kFIRStorageMetadataContentType = @"contentType";
+NSString *const kFIRStorageMetadataCustomMetadata = @"metadata";
+NSString *const kFIRStorageMetadataSize = @"size";
+NSString *const kFIRStorageMetadataDownloadURLs = @"downloadURLs";
+NSString *const kFIRStorageMetadataGeneration = @"generation";
+NSString *const kFIRStorageMetadataMetageneration = @"metageneration";
+NSString *const kFIRStorageMetadataTimeCreated = @"timeCreated";
+NSString *const kFIRStorageMetadataUpdated = @"updated";
+NSString *const kFIRStorageMetadataName = @"name";
+NSString *const kFIRStorageMetadataDownloadTokens = @"downloadTokens";
+
+// TODO: add notification support
+NSString *const kFIRStorageTaskStatusResumeNotification =
+    @"kFIRStorageTaskStatusResumeNotification";
+NSString *const kFIRStorageTaskStatusPauseNotification = @"kFIRStorageTaskStatusResumeNotification";
+NSString *const kFIRStorageTaskStatusProgressNotification =
+    @"kFIRStorageTaskStatusResumeNotification";
+NSString *const kFIRStorageTaskStatusCompleteNotification =
+    @"kFIRStorageTaskStatusResumeNotification";
+NSString *const kFIRStorageTaskStatusFailureNotification =
+    @"kFIRStorageTaskStatusResumeNotification";
+
+NSString *const kFIRStorageBundleIdentifier = @"com.google.firebase.storage";
+
+// The STR and STR_EXPAND macro allow a numeric version passed to he compiler driver
+// with a -D to be treated as a string instead of an invalid floating point value.
+#define STR(x) STR_EXPAND(x)
+#define STR_EXPAND(x) #x
+const unsigned char *const FIRStorageVersionString =
+    (const unsigned char *const) STR(FIRStorage_VERSION);