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https://github.com/leimd/react-native-aws-signature

library to generate AWS signaure V4 for React Native application
https://github.com/leimd/react-native-aws-signature

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library to generate AWS signaure V4 for React Native application

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# react-native-aws-signature

### helps you generate signature for aws request for React-Native applications (or other js applications )

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library to generate AWS signaure V4 for React Native application because react-native's javascript runtime doesn't support running aws-sdk-js.

This is the first part if you want to make any signed calls to AWS.



## Installation

`npm install react-native-aws-signature --save`



## Usage

``` javascript

var AWSSignature = require('react-native-aws-signature');

var awsSignature = new AWSSignature();

let credentials = {

	SecretKey: 'wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY',

	AccessKeyId: 'sdfsdfsdfsdfsdfsdf'

};

var options = {

	path: '/?Param2=value2&Param1=value1',

    method: 'get',

    service: 'service',

    headers: {

        'X-Amz-Date': '20150209T123600Z',

        'host': 'example.amazonaws.com'

    },

	region: 'us-east-1',

	body: '',

	credentials

};

awsSignature.setParams(options);

var signature = awsSignature.getSignature();

var authorization = awsSignature.getAuthorizationHeader();

```



##Workflow

1.Instantiate AWSSignature object by calling `var awsSignature = new AWSSignature();`



2.Set signature parameter by calling 'AWSSignature#setParams' with option object as the only parameter.



	the option given in the example comprises of the minimal requirement needed to generate AWS signature



|option| |

|---|---|

|path|the path you're calling|

|method| HTTP method |

|service| AWS Service you're using ex. s3|

|headers| HTTP headers|

|region| AWS regions|

|body| HTTP request body|

|credentials| credentails object returned by coginto##GetCredentialsForIdentity, more on this later|



for headers, `host` and (`date` or `X-Amz-Date`) is required, other wise an exception will raise.



The datetime string passed with date header or X-Amz-Date has to be Amazon styled ISO 8601 strings like the one provided above, you can get one by calling 

`AWSSignature#_formatDateTime` and pass in an ISO 8601 string as the parameter.



For example `awsSignature._formatDateTime('2015-02-09T10:00:00Z')` will return `20150209T100000Z` which is accecptable as `X-Amz-Date`.

* this method might be moved to a util class once this project expands its scope so don't really count on using it*



##getSignature vs getAuthorizationHeader

once you did `setParams`, you could either use `getSignature` or `getAuthorizationHeader` to get the signature, the difference is that getAuthorizationHeader will return something like the following so that you can use it in the following steps.

``` javascript

{

Authorization: 'AWS4-HMAC-SHA256 Credential=AKIDEXAMPLE/20150830/us-east-1/iam/aws4_request, SignedHeaders=content-type;host;x-amz-date, Signature=5d672d79c15b13162d9279b0855cfba6789a8edb4c82c400e06b5924a6f2b5d7'

}

```



This corresponds to [Step4](http://docs.aws.amazon.com/general/latest/gr/sigv4-add-signature-to-request.html) of the documentation online.



## Credentials

The minials requried credentail object looks like this:

```javascript

{

	SecretKey: 'wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY',

	AccessKeyId: 'sdfsdfsdfsdfsdfsdf'

};

```



The required keys are `SecretKey` and `AccessKeyId`that you get from coginto##GetCredentialsForIdentity or somewhere else.



## running test

once you cloned the git repo, do `npn install` first to install all the dependencies,



tests are written in jasmine, so just use `jasmine` to run the unit tests.