U 5i@s dZddlZddlZddlZddlZddlZddlmZddlm Z m Z ddl m Z ddl mZddlmZedZd ZGd d d eZGd d d eZddZddZddZddZd(ddZd)ddZGdddZddedfd d!Zddedfd"d#ZGd$d%d%ZGd&d'd'eZ dS)*ae Functions for creating and restoring url-safe signed JSON objects. The format used looks like this: >>> signing.dumps("hello") 'ImhlbGxvIg:1QaUZC:YIye-ze3TTx7gtSv422nZA4sgmk' There are two components here, separated by a ':'. The first component is a URLsafe base64 encoded JSON of the object passed to dumps(). The second component is a base64 encoded hmac/SHA1 hash of "$first_component:$secret" signing.loads(s) checks the signature and returns the deserialized object. If the signature fails, a BadSignature exception is raised. >>> signing.loads("ImhlbGxvIg:1QaUZC:YIye-ze3TTx7gtSv422nZA4sgmk") 'hello' >>> signing.loads("ImhlbGxvIg:1QaUZC:YIye-ze3TTx7gtSv422nZA4sgmk-modified") ... BadSignature: Signature failed: ImhlbGxvIg:1QaUZC:YIye-ze3TTx7gtSv422nZA4sgmk-modified You can optionally compress the JSON prior to base64 encoding it to save space, using the compress=True argument. This checks if compression actually helps and only applies compression if the result is a shorter string: >>> signing.dumps(list(range(1, 20)), compress=True) '.eJwFwcERACAIwLCF-rCiILN47r-GyZVJsNgkxaFxoDgxcOHGxMKD_T7vhAml:1QaUaL:BA0thEZrp4FQVXIXuOvYJtLJSrQ' The fact that the string is compressed is signalled by the prefixed '.' at the start of the base64 JSON. There are 65 url-safe characters: the 64 used by url-safe base64 and the ':'. These functions make use of all of them. N)settings)constant_time_compare salted_hmac) force_bytes) import_string)_lazy_re_compilez^[A-z0-9-_=]*$Z>0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzc@seZdZdZdS) BadSignaturezSignature does not match.N__name__ __module__ __qualname____doc__rr7/tmp/pip-unpacked-wheel-gcyiijx6/django/core/signing.pyr4src@seZdZdZdS)SignatureExpiredz3Signature timestamp is older than required max_age.Nr rrrrr9srcCsT|dkr dS|dkrdnd}t|}d}|dkrLt|d\}}t||}q(||S)Nr0->)absdivmodBASE62_ALPHABET)ssignencoded remainderrrr b62_encode>srcCsT|dkr dSd}|ddkr,|dd}d}d}|D]}|dt|}q4||S)Nrrrr)rindex)rrdecodeddigitrrr b62_decodeJs  r"cCst|dS)N=)base64urlsafe_b64encodestrip)rrrr b64_encodeWsr'cCs dt| d}t||S)Nr#)lenr$urlsafe_b64decode)rpadrrr b64_decode[sr,sha1cCstt||||dS)N algorithm)r'rdigestdecode)saltvaluekeyr/rrr base64_hmac`sr5%django.core.signing.get_cookie_signercCs$ttj}ttj}|d||dS)Nsdjango.http.cookiesr2)rrZSIGNING_BACKENDr SECRET_KEY)r2Signerr4rrrget_cookie_signerds  r:c@s eZdZdZddZddZdS)JSONSerializerzW Simple wrapper around json to be used in signing.dumps and signing.loads. cCstj|dddS)N),:) separatorslatin-1)jsondumpsencode)selfobjrrrrAoszJSONSerializer.dumpscCst|dS)Nr?)r@loadsr1)rCdatarrrrErszJSONSerializer.loadsN)r r r r rArErrrrr;jsr;zdjango.core.signingFcCst||dj|||dS)a Return URL-safe, hmac signed base64 compressed JSON string. If key is None, use settings.SECRET_KEY instead. The hmac algorithm is the default Signer algorithm. If compress is True (not the default), check if compressing using zlib can save some space. Prepend a '.' to signify compression. This is included in the signature, to protect against zip bombs. Salt can be used to namespace the hash, so that a signed string is only valid for a given namespace. Leaving this at the default value or re-using a salt value across different parts of your application without good cause is a security risk. The serializer is expected to return a bytestring. r7) serializercompress)TimestampSigner sign_object)rDr4r2rGrHrrrrAvsrAcCst||dj|||dS)z| Reverse of dumps(), raise BadSignature if signature fails. The serializer is expected to accept a bytestring. r7)rGmax_age)rI unsign_object)rr4r2rGrKrrrrEsrEc@sHeZdZdddZddZddZd d Zed fd d ZefddZ dS)r9Nr=cCsR|ptj|_||_t|jr*td||p@d|jj|jj f|_ |pJd|_ dS)NzJUnsafe Signer separator: %r (cannot be empty or consist of only A-z0-9-_=)z%s.%ssha256) rr8r4sep _SEP_UNSAFEmatch ValueError __class__r r r2r/)rCr4rNr2r/rrr__init__s  zSigner.__init__cCst|jd||j|jdS)NZsignerr.)r5r2r4r/rCr3rrr signatureszSigner.signaturecCsd||j||fSNz%s%s%s)rNrUrTrrrrsz Signer.signcCsN|j|krtd|j||jd\}}t|||r>|Std|dS)NzNo "%s" found in valuerzSignature "%s" does not match)rNrrsplitrrU)rCZ signed_valuer3sigrrrunsigns  z Signer.unsignFcCs\||}d}|r:t|}t|t|dkr:|}d}t|}|rRd|}||S)ae Return URL-safe, hmac signed base64 compressed JSON string. If compress is True (not the default), check if compressing using zlib can save some space. Prepend a '.' to signify compression. This is included in the signature, to protect against zip bombs. The serializer is expected to return a bytestring. FrT.)rAzlibrHr)r'r1r)rCrDrGrHrFZ is_compressed compressedbase64drrrrJs   zSigner.sign_objectcKsT|j|f|}|dddk}|r2|dd}t|}|rHt|}||S)Nr.)rYrBr,r[ decompressrE)rCZ signed_objrGkwargsr]r_rFrrrrLs  zSigner.unsign_object)Nr=NN) r r r rSrUrrYr;rJrLrrrrr9s  r9cs2eZdZddZfddZdfdd ZZS) rIcCstttS)N)rinttime)rCrrr timestampszTimestampSigner.timestampcs d||j|f}t|SrV)rNrcsuperrrTrRrrrszTimestampSigner.signNcsjt|}||jd\}}t|}|dk rft|tjrB|}t |}||krft d||f|S)zk Retrieve original value and check it wasn't signed more than max_age seconds ago. rNzSignature age %s > %s seconds) rdrYrWrNr" isinstancedatetime timedelta total_secondsrbr)rCr3rKresultrcZagererrrYs    zTimestampSigner.unsign)N)r r r rcrrY __classcell__rrrerrIs rI)r-)r6)!r r$rgr@rbr[Z django.confrZdjango.utils.cryptorrZdjango.utils.encodingrZdjango.utils.module_loadingrZdjango.utils.regex_helperrrOr Exceptionrrrr"r'r,r5r:r;rArEr9rIrrrrs2#          A