3 Jh[|& @sddlZddlZddlZyddlmZddlmZWn$ek rXddlmZmZYnXddlZddZ ddZ Gd d d ej j Z dS) N)quote)urlparse)rrcCstj||jdtjjS)zf Copied from https://docs.aws.amazon.com/general/latest/gr/sigv4-signed-request-examples.html zutf-8)hmacnewencodehashlibsha256digest)keymsgr R/home/moumis/lambda-venv/lib/python3.6/site-packages/aws_requests_auth/aws_auth.pysignsrcCs6td|jd|}t||}t||}t|d}|S)zf Copied from https://docs.aws.amazon.com/general/latest/gr/sigv4-signed-request-examples.html ZAWS4zutf-8 aws4_request)rr)r Z dateStampZ regionNameZ serviceNameZkDateZkRegionZkServiceZkSigningr r r getSignatureKeys    rc@sJeZdZdZdddZddZddZd d Zed d Z ed dZ dS)AWSRequestsAuthz Auth class that allows us to connect to AWS services via Amazon's signature version 4 signing process Adapted from https://docs.aws.amazon.com/general/latest/gr/sigv4-signed-request-examples.html NcCs(||_||_||_||_||_||_dS)a Example usage for talking to an AWS Elasticsearch Service: AWSRequestsAuth(aws_access_key='YOURKEY', aws_secret_access_key='YOURSECRET', aws_host='search-service-foobar.us-east-1.es.amazonaws.com', aws_region='us-east-1', aws_service='es', aws_token='...') The aws_token is optional and is used only if you are using STS temporary credentials. N)aws_access_keyaws_secret_access_keyaws_host aws_regionservice aws_token)selfrrrrZ aws_servicerr r r __init__*s zAWSRequestsAuth.__init__cCs|j|}|jj||S)z Adds the authorization headers required by Amazon's signature version 4 signing process to the request. Adapted from https://docs.aws.amazon.com/general/latest/gr/sigv4-signed-request-examples.html )get_aws_request_headers_handlerheadersupdate)rrZ aws_headersr r r __call__Es  zAWSRequestsAuth.__call__cCs|j||j|j|jdS)aN Override get_aws_request_headers_handler() if you have a subclass that needs to call get_aws_request_headers() with an arbitrary set of AWS credentials. The default implementation calls get_aws_request_headers() with self.aws_access_key, self.aws_secret_access_key, and self.aws_token )rrrr)get_aws_request_headersrrr)rrr r r rPsz/AWSRequestsAuth.get_aws_request_headers_handlerc Cstjj}|jd}|jd}tj|}tj|} d|jdd|d} |r`| d|d7} d} |rp| d7} |jr||jnt} y| j d } Wnt t fk r| } YnXt j | j} |jd|d| d| d| d| }d }|d |jd |jd d }|d|d|dt j |j d j}t|||j|j}|j d }tj||t j j}|d d|d |dd| dd|}||| d}|r||d<|S)a Returns a dictionary containing the necessary headers for Amazon's signature version 4 signing process. An example return value might look like { 'Authorization': 'AWS4-HMAC-SHA256 Credential=YOURKEY/20160618/us-east-1/es/aws4_request, ' 'SignedHeaders=host;x-amz-date, ' 'Signature=ca0a856286efce2a4bd96a978ca6c8966057e53184776c0685169d08abd74739', 'x-amz-date': '20160618T220405Z', } z%Y%m%dT%H%M%SZz%Y%m%dzhost: z x-amz-date:zx-amz-security-token:zhost;x-amz-datez;x-amz-security-tokenzutf-8zAWS4-HMAC-SHA256/r z Credential=z, zSignedHeaders=z Signature=)Z Authorizationz x-amz-datezx-amz-content-sha256zX-Amz-Security-Token)datetimeutcnowstrftimerget_canonical_pathget_canonical_querystringrbodybytesrAttributeErrorUnicodeDecodeErrorrr hexdigestmethodrrrrr)rrrrrtZamzdateZ datestampZ canonical_uricanonical_querystringZcanonical_headersZsigned_headersr(Z payload_hashZcanonical_request algorithmZcredential_scopeZstring_to_signZ signing_keyZstring_to_sign_utf8 signatureZauthorization_headerrr r r r]sH      . ,  0z'AWSRequestsAuth.get_aws_request_headerscCs"t|j}t|jr|jndddS)zt Create canonical URI--the part of the URI from domain to query string (use '/' if no path) r!z/-_.~)safe)rurlrpath)clsr parsedurlr r r r&s z"AWSRequestsAuth.get_canonical_pathc Csd}t|j}djt|jjd}xb|jdD]T}|jdd}|d}t|dkr^|d}nd}|r0|rr|d7}|dj||g7}q0W|S)af Create the canonical query string. According to AWS, by the end of this function our query string values must be URL-encoded (space=%20) and the parameters must be sorted by name. This method assumes that the query params in `r` are *already* url encoded. If they are not url encoded by the time they make it to this function, AWS may complain that the signature for your request is incorrect. It appears elasticsearc-py url encodes query paramaters on its own: https://github.com/elastic/elasticsearch-py/blob/5dfd6985e5d32ea353d2b37d01c2521b2089ac2b/elasticsearch/connection/http_requests.py#L64 If you are using a different client than elasticsearch-py, it will be your responsibility to urleconde your query params before this method is called. &=r)rr3joinsortedquerysplitlen) r5rr/r6Zquerystring_sortedZ query_paramZ key_val_splitr valr r r r's    z)AWSRequestsAuth.get_canonical_querystring)N) __name__ __module__ __qualname____doc__rrrr classmethodr&r'r r r r r"s   ` r)rrr#urllibrr ImportError urllib.parseZrequestsrrZauthZAuthBaserr r r r s