o hT"@s*dZddlZddlZddlZddlZddlZddlmZddlm Z m Z ddl m Z ddl mZddlmZedZd ZGd d d eZGd d d eZddZddZddZddZd*ddZddZd+ddZGdddZdd ed!fd"d#Zdd eddfd$d%ZGd&d'd'Z Gd(d)d)e Z!dS),a_ Functions for creating and restoring url-safe signed JSON objects. The format used looks like this: >>> signing.dumps("hello") 'ImhlbGxvIg:1QaUZC:YIye-ze3TTx7gtSv422nZA4sgmk' There are two components here, separated by a ':'. The first component is a URLsafe base64 encoded JSON of the object passed to dumps(). The second component is a base64 encoded hmac/SHA-256 hash of "$first_component:$secret" signing.loads(s) checks the signature and returns the deserialized object. If the signature fails, a BadSignature exception is raised. >>> signing.loads("ImhlbGxvIg:1QaUZC:YIye-ze3TTx7gtSv422nZA4sgmk") 'hello' >>> signing.loads("ImhlbGxvIg:1QaUZC:YIye-ze3TTx7gtSv42-modified") ... BadSignature: Signature "ImhlbGxvIg:1QaUZC:YIye-ze3TTx7gtSv42-modified" does not match You can optionally compress the JSON prior to base64 encoding it to save space, using the compress=True argument. This checks if compression actually helps and only applies compression if the result is a shorter string: >>> signing.dumps(list(range(1, 20)), compress=True) '.eJwFwcERACAIwLCF-rCiILN47r-GyZVJsNgkxaFxoDgxcOHGxMKD_T7vhAml:1QaUaL:BA0thEZrp4FQVXIXuOvYJtLJSrQ' The fact that the string is compressed is signalled by the prefixed '.' at the start of the base64 JSON. There are 65 url-safe characters: the 64 used by url-safe base64 and the ':'. These functions make use of all of them. N)settings)constant_time_compare salted_hmac force_bytes) import_string)_lazy_re_compilez^[A-z0-9-_=]*$>0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzc@eZdZdZdS) BadSignaturezSignature does not match.N__name__ __module__ __qualname____doc__rrE/var/www/html/env/lib/python3.10/site-packages/django/core/signing.pyr 4r c@r )SignatureExpiredz3Signature timestamp is older than required max_age.Nr rrrrr:rrcCsZ|dkrdS|dkr dnd}t|}d}|dkr)t|d\}}t||}|dks||S)Nr0->)absdivmodBASE62_ALPHABET)ssignencoded remainderrrr b62_encode@s r cCsT|dkrdSd}|ddkr|dd}d}d}|D] }|dt|}q||S)Nrrrr)rindex)rrdecodeddigitrrr b62_decodeLs  r&cCst|dS)N=)base64urlsafe_b64encodestrip)rrrr b64_encodeYr+cCs dt| d}t||S)Nr')lenr(urlsafe_b64decode)rpadrrr b64_decode]sr1sha1cCstt||||dS)N algorithm)r+rdigestdecode)saltvaluekeyr4rrr base64_hmacbs r:cCs dt|S)Nsdjango.http.cookiesr)r9rrr_cookie_signer_keyhs r;%django.core.signing.get_cookie_signercCs&ttj}|ttjtttj|dS)N)r9 fallback_keysr7)rrSIGNING_BACKENDr; SECRET_KEYmapSECRET_KEY_FALLBACKS)r7Signerrrrget_cookie_signerms  rCc@s eZdZdZddZddZdS)JSONSerializerzW Simple wrapper around json to be used in signing.dumps and signing.loads. cCstj|dddS)N),:) separatorslatin-1)jsondumpsencode)selfobjrrrrJ|szJSONSerializer.dumpscCst|dS)NrH)rIloadsr6)rLdatarrrrNr,zJSONSerializer.loadsN)r rrrrJrNrrrrrDvs rDzdjango.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)rMr9r7rPrQrrrrJs rJcCst|||dj|||dS)z| Reverse of dumps(), raise BadSignature if signature fails. The serializer is expected to accept a bytestring. )r7r=)rPmax_age)rR unsign_object)rr9r7rPrTr=rrrrNs  rNc@sTeZdZ     dddZdddZddZd d Zed fd d ZefddZ dS)rBNrFcCsf|ptj|_|dur |ntj|_||_t|jrtd||p*d|j j |j j f|_ |p/d|_ dS)NzJUnsafe Signer separator: %r (cannot be empty or consist of only A-z0-9-_=)z%s.%ssha256)rr?r9rAr=sep _SEP_UNSAFEmatch ValueError __class__rr r7r4)rLr9rWr7r4r=rrr__init__s"  zSigner.__init__cCs"|p|j}t|jd|||jdS)Nsignerr3)r9r:r7r4)rLr8r9rrr signatures zSigner.signaturecCsd||j||fSNz%s%s%s)rWr^rLr8rrrrsz Signer.signcCsd|j|vr td|j||jd\}}|jg|jD]}t||||r+|Sqtd|)NzNo "%s" found in valuer!zSignature "%s" does not match)rWr rsplitr9r=rr^)rL signed_valuer8sigr9rrrunsigns  z Signer.unsignFcCs\||}d}|rt|}t|t|dkr|}d}t|}|r)d|}||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. Fr!T.)rJzlibrQr.r+r6r)rLrMrPrQrO is_compressed compressedbase64drrrrSs    zSigner.sign_objectcKsX|j|fi|}|dddk}|r|dd}t|}|r&t|}||S)Nr!.)rdrKr1rf decompressrN)rL signed_objrPkwargsrirkrOrrrrUs   zSigner.unsign_object)NrFNNNN) r rrr\r^rrdrDrSrUrrrrrBs  rBcs2eZdZddZfddZdfdd ZZS) rRcCstttSrn)r inttime)rLrrr timestampr,zTimestampSigner.timestampcs d||j|f}t|Sr_)rWrqsuperrr`r[rrrs zTimestampSigner.signNcsjt|}||jd\}}t|}|dur3t|tjr!|}t |}||kr3t d||f|S)zk Retrieve original value and check it wasn't signed more than max_age seconds ago. r!NzSignature age %s > %s seconds) rrrdrarWr& isinstancedatetime timedelta total_secondsrpr)rLr8rTresultrqagersrrrd s   zTimestampSigner.unsignrn)r rrrqrrd __classcell__rrrsrrRs rR)r2)r<)"rr(rurIrprf django.confrdjango.utils.cryptorrdjango.utils.encodingrdjango.utils.module_loadingrdjango.utils.regex_helperrrXr Exceptionr rr r&r+r1r:r;rCrDrJrNrBrRrrrrsB#           R