// p≡p Basic API

// Copyleft (c) 2019, p≡p foundation
// this file is under GNU General Public License 3.0
// see LICENSE.txt

// written by Nana Karlstetter and Volker Birk


type ISO639_1 is string size=2 > a-z

type hex is string > a-f0-9

type hash doc="32bit Key ID to SHA512 in hex"
    is hex min=16, max=128;

type hash_list doc="sequence of fingerprints of keys"
    is list< hash >;

type TID doc="UUID version 4 variant 1"
    is binary size=16;

type blob_list is list< blob >;

type identity_list is list< identity >;

type string_list is list< string > ; 

type string_pair is pair< string, string >;


enum comm_type {
    hex unknown 0;

    doc > range 0x01 to 0x09: no encryption, 0x0a to 0x0e: nothing reasonable

    hex no_encryption 0x01                 doc="generic";
    hex no_encrypted_channel 0x02;
    hex key_not_found 0x03;
    hex key_expired 0x04;
    hex key_revoked 0x05;
    hex key_b0rken 0x06;

    hex key_expired_but_confirmed 0x07
        doc="NOT with confirmed bit. Just retaining info here in case of renewal.";

    hex my_key_not_included 0x09;

    hex security_by_obscurity 0x0a;
    hex b0rken_crypto 0x0b;
    hex key_too_short 0x0c;

    hex compromised 0x0e                   doc="known compromised connection";
    hex compromized 0x0e                   doc="deprecated misspelling";
    hex mistrusted 0x0f                    doc="known mistrusted key";

    doc > range 0x10 to 0x3f: unconfirmed encryption

    hex unconfirmed_encryption 0x10        doc="generic";
    hex OpenPGP_weak_unconfirmed 0x11      doc="RSA 1024 is weak";

    hex to_be_checked 0x20                 doc="generic";
    hex SMIME_unconfirmed 0x21;
    hex CMS_unconfirmed 0x22;

    hex strong_but_unconfirmed 0x30        doc="generic";
    hex OpenPGP_unconfirmed 0x38           doc="key at least 2048 bit RSA or EC";
    hex OTR_unconfirmed 0x3a;

    doc > range 0x40 to 0x7f: unconfirmed encryption and anonymization

    hex unconfirmed_enc_anon 0x40          doc="generic";
    hex pEp_unconfirmed 0x7f 

    hex confirmed 0x80                     doc="this bit decides if trust is confirmed";

    doc > range 0x81 to 0x8f: reserved
    doc > range 0x90 to 0xbf: confirmed encryption

    hex confirmed_encryption 0x90          doc="generic";
    hex OpenPGP_weak 0x91                  doc="RSA 1024 is weak (unused)";

    hex to_be_checked_confirmed 0xa0       doc="generic";
    hex SMIME 0xa1;
    hex CMS 0xa2;

    hex strong_encryption 0xb0             doc="generic";
    hex OpenPGP 0xb8                       doc="key at least 2048 bit RSA or EC";
    hex OTR 0xba;

    doc > range 0xc0 to 0xff: confirmed encryption and anonymization

    hex confirmed_enc_anon 0xc0            doc="generic";
    hex pEp 0xff

} // enum comm_type


struct identity {
    
    field string address doc="SMTP address or URI";
    field hash fpr doc="fingerprint of key being used as ID";
    field string user_id doc="ID for person or entity in M2M case";
    field string username doc="descriptive string";
    field ISO639_1 lang doc="two-digit language code or null bytes";

    flags {
        flag not_for_sync 0x0001
            doc="don't use this identity for Sync";

        flag list 0x0002
            doc="identity of list of persons";

        doc | the second octet flags are calculated

        flag devicegroup 0x0100
            doc="identity of a device group member"
    }

} // struct Identity


callback messageToSend
    doc="a message needs to be delivered by application"
{
    // parms

    provide struct_message msg doc="message struct with message to send"

    // exceptions

    throws any doc="error status"
}