§
    D¯½jq  ã                  óp   — d Z ddlmZ ddlZddlZddlZddlmZmZm	Z	 ddl
mZmZmZ  G d„ d¦  «        ZdS )zð
Cryptographic Item Hyperlinking and Snapshot Authentication Service.
Generates and validates HMAC-SHA256 signatures to prevent spoofing items in chat.
Stores snapshots with 24h TTL to eliminate database queries when players view tooltips.
é    )ÚannotationsN)ÚDictÚOptionalÚTuple)ÚItemAffixDTOÚItemSnapshotDTOÚQueryItemSnapshotResponseDTOc                  ó`   — e Zd ZdZdZd"d#d„Z	 	 	 d$d%d„Zdd	efd&d„Z	 	 	 d$d'd„Zd(d „Z	d)d!„Z
d	S )*ÚItemLinkServicez}
    Manages authentic item linking for chat flexing.
    Enforces HMAC-SHA256 validation to ensure 100% item integrity.
    i€Q ó!   FREEEXILE_SECRET_SIGNING_KEY_2026Úsecret_signing_keyÚbytesÚreturnÚNonec                ó"   — || _         i | _        d S )N)Ú
secret_keyÚ_snapshot_cache)Úselfr   s     ú6C:\Projects\FreeExile\server\chat\item_link_service.pyÚ__init__zItemLinkService.__init__   s   € Ø,ˆŒàIKˆÔÐÐó    NÚ	item_uuidÚstrÚitem_name_keyÚrarityÚintÚelementúOptional[int]ÚqualityÚ
item_levelc                ó  — |�+|�)|�'|› d|› d|› d|› d|› d|› �                      d¦  «        }n|› d|› d|› �                      d¦  «        }t          j        | j        |t          j        ¦  «                             ¦   «         S )zä
        Computes server-authoritative HMAC-SHA256 signature for an item.
        Default signature covers (item_uuid, item_name_key, rarity).
        If full attributes are provided, computes signature over full specs.
        Nú:zutf-8)ÚencodeÚhmacÚnewr   ÚhashlibÚsha256Ú	hexdigest)r   r   r   r   r   r   r    Úmessages           r   Úcompute_signaturez!ItemLinkService.compute_signature   s¦   € ð Ð 7Ð#6¸:Ð;QØ"Ð^Ð^ ]Ð^Ð^°VÐ^Ð^¸gÐ^Ð^ÈÐ^Ð^ÐR\Ð^Ð^×eÒeÐfmÑnÔnˆGˆGà"Ð=Ð= ]Ð=Ð=°VÐ=Ð=×DÒDÀWÑMÔMˆGÝŒx˜œ¨µ'´.ÑAÔA×KÒKÑMÔMÐMr   © Úcrafter_nameÚaffixesúTuple[ItemAffixDTO, ...]Úcreated_at_msÚttl_secondsr   c                óø   — |                       |||¦  «        }|	�|	n"t          t          j        ¦   «         dz  ¦  «        }t          ||||||||||¬¦
  «
        }t          j        ¦   «         |
z   }||f| j        |<   |S )z�
        Generates an authenticated item snapshot and caches it for chat broadcast.
        Guarantees 24h TTL cache to protect inventory databases.
        Niè  )
r   r   r   r   r   r    r,   Úhmac_signaturer/   r-   )r*   r   Útimer   r   )r   r   r   r   r   r   r    r,   r-   r/   r0   Ú	signatureÚnow_msÚsnapshotÚexpirys                  r   Úcreate_item_snapshotz$ItemLinkService.create_item_snapshot2   s˜   € ð" ×*Ò*¨9°mÀVÑLÔLˆ	Ø"/Ð";��ÅÅTÄYÁ[Ä[ÐSWÑEWÑAXÔAXˆå"ØØ'ØØØØ!Ø%Ø$Ø Øð
ñ 
ô 
ˆõ ”‘”˜{Ñ*ˆØ+3°VÐ*<ˆÔ˜YÑ'Øˆr   Úclaimed_signatureÚboolc                óÐ   — |                       |||¦  «        }t          j        ||¦  «        rdS |�5|�3|�1|                       ||||||¦  «        }	t          j        |	|¦  «        rdS dS )z�
        Verifies if the claimed signature matches the item's immutable attributes.
        Uses constant-time comparison to prevent timing attacks.
        TNF)r*   r$   Úcompare_digest)
r   r   r   r   r9   r   r   r    Úexpected_basicÚexpected_fulls
             r   Úverify_item_signaturez%ItemLinkService.verify_item_signatureW   s†   € ð ×/Ò/°	¸=È&ÑQÔQˆÝÔ˜~Ð/@ÑAÔAð 	Ø�4ØÐ 7Ð#6¸:Ð;QØ ×2Ò2°9¸mÈVÐU\Ð^eÐgqÑrÔrˆMÝÔ" =Ð2CÑDÔDð Ø�tØˆur   r	   c                óf  — |                       ¦   «          | j                             |¦  «        }|st          dd¬¦  «        S |\  }}t	          j        ¦   «         |k    r| j        |= t          dd¬¦  «        S t          j        |j        |¦  «        st          dd¬¦  «        S t          d|¬¦  «        S )z{
        Queries an item snapshot for tooltip rendering.
        Validates both signature integrity and cache TTL.
        Fz'Item snapshot not found or has expired.)Úis_validÚerror_messagezItem snapshot has expired.zBCryptographic signature mismatch! Potential item spoofing attempt.T)rA   Úitem_snapshot)Ú_cleanup_expiredr   Úgetr	   r3   r$   r<   r2   )r   r   r9   Úentryr6   r7   s         r   Úquery_item_snapshotz#ItemLinkService.query_item_snapshotn   sí   € ð
 	×ÒÑÔÐàÔ$×(Ò(¨Ñ3Ô3ˆØð 	Ý/ØØGðñ ô ð ð
 !Ñˆ�&ÝŒ9‰;Œ;˜ÒÐØÔ$ YÐ/Ý/ØØ:ðñ ô ð õ
 Ô" 8Ô#:Ð<MÑNÔNð 	Ý/ØØbðñ ô ð õ
 ,ØØ"ð
ñ 
ô 
ð 	
r   c                ó’   ‡— t          j         ¦   «         Šˆfd„| j                             ¦   «         D ¦   «         }|D ]
}| j        |= ŒdS )z+Purges expired snapshots from memory cache.c                ó,   •— g | ]\  }\  }}‰|k    ¯|‘ŒS r+   r+   )Ú.0ÚkÚ_ÚexpÚnows       €r   ú
<listcomp>z4ItemLinkService._cleanup_expired.<locals>.<listcomp>’   s'   ø€ ÐWÐWÐW™k˜a¡ ! SÈSÐSVÊYÈY˜ÈYÈYÈYr   N)r3   r   Úitems)r   Úexpired_keysrK   rN   s      @r   rD   z ItemLinkService._cleanup_expired�   s]   ø€ åŒi‰kŒkˆØWÐWÐWÐW¨TÔ-A×-GÒ-GÑ-IÔ-IÐWÑWÔWˆØð 	(ð 	(ˆAØÔ$ QÐ'Ð'ð	(ð 	(r   )r   )r   r   r   r   )NNN)r   r   r   r   r   r   r   r   r   r   r    r   r   r   )r   r   r   r   r   r   r   r   r   r   r    r   r,   r   r-   r.   r/   r   r0   r   r   r   )r   r   r   r   r   r   r9   r   r   r   r   r   r    r   r   r:   )r   r   r9   r   r   r	   )r   r   )Ú__name__Ú
__module__Ú__qualname__Ú__doc__ÚDEFAULT_TTL_SECONDSr   r*   r8   r?   rG   rD   r+   r   r   r   r      sß   € € € € € ðð ð
  ÐðLð Lð Lð Lð Lð "&Ø!%Ø$(ðNð Nð Nð Nð Nð: -/Ø'+Ø.ð#ð #ð #ð #ð #ðV "&Ø!%Ø$(ðð ð ð ð ð.
ð 
ð 
ð 
ðB(ð (ð (ð (ð (ð (r   r   )rU   Ú
__future__r   r&   r$   r3   Útypingr   r   r   Úserver.chat.chat_typesr   r   r	   r   r+   r   r   ú<module>rZ      s¶   ððð ð #Ð "Ð "Ð "Ð "Ð "à €€€Ø €€€Ø €€€Ø (Ð (Ð (Ð (Ð (Ð (Ð (Ð (Ð (Ð (à ^Ð ^Ð ^Ð ^Ð ^Ð ^Ð ^Ð ^Ð ^Ð ^ðC(ð C(ð C(ð C(ð C(ñ C(ô C(ð C(ð C(ð C(r   