more libzot stuff

1 files changed, 167 insertions, 0 deletions

diff --git a/Zotlabs/Zot/Receiver.php b/Zotlabs/Zot/Receiver.php
index 6a11bcde0..238de1332 100644
--- a/Zotlabs/Zot/Receiver.php
+++ b/Zotlabs/Zot/Receiver.php
@@ -127,3 +127,170 @@ class Receiver {
 
 	}
 }
+
+
+
+/**
+ * @brief zot communications and messaging.
+ *
+ * Sender HTTP posts to this endpoint ($site/post typically) with 'data' parameter set to json zot message packet.
+ * This packet is optionally encrypted, which we will discover if the json has an 'iv' element.
+ * $contents => array( 'alg' => 'aes256cbc', 'iv' => initialisation vector, 'key' => decryption key, 'data' => encrypted data);
+ * $contents->iv and $contents->key are random strings encrypted with this site's RSA public key and then base64url encoded.
+ * Currently only 'aes256cbc' is used, but this is extensible should that algorithm prove inadequate.
+ *
+ * Once decrypted, one will find the normal json_encoded zot message packet.
+ * 
+ * Defined packet types are: notify, purge, refresh, force_refresh, auth_check, ping, and pickup 
+ *
+ * Standard packet: (used by notify, purge, refresh, force_refresh, and auth_check)
+ * \code{.json}
+ * {
+ *   "type": "notify",
+ *   "sender":{
+ *     "guid":"kgVFf_1...",
+ *     "guid_sig":"PT9-TApzp...",
+ *     "url":"http:\/\/podunk.edu",
+ *     "url_sig":"T8Bp7j5...",
+ *   },
+ *   "recipients": { optional recipient array },
+ *   "callback":"\/post",
+ *   "version":1,
+ *   "secret":"1eaa...",
+ *   "secret_sig": "df89025470fac8..."
+ * }
+ * \endcode
+ *
+ * Signature fields are all signed with the sender channel private key and base64url encoded.
+ * Recipients are arrays of guid and guid_sig, which were previously signed with the recipients private 
+ * key and base64url encoded and later obtained via channel discovery. Absence of recipients indicates
+ * a public message or visible to all potential listeners on this site.
+ *
+ * "pickup" packet:
+ * The pickup packet is sent in response to a notify packet from another site
+ * \code{.json}
+ * {
+ *   "type":"pickup",
+ *   "url":"http:\/\/example.com",
+ *   "callback":"http:\/\/example.com\/post",
+ *   "callback_sig":"teE1_fLI...",
+ *   "secret":"1eaa...",
+ *   "secret_sig":"O7nB4_..."
+ * }
+ * \endcode
+ *
+ * In the pickup packet, the sig fields correspond to the respective data
+ * element signed with this site's system private key and then base64url encoded.
+ * The "secret" is the same as the original secret from the notify packet. 
+ *
+ * If verification is successful, a json structure is returned containing a
+ * success indicator and an array of type 'pickup'.
+ * Each pickup element contains the original notify request and a message field
+ * whose contents are dependent on the message type.
+ *
+ * This JSON array is AES encapsulated using the site public key of the site
+ * that sent the initial zot pickup packet.
+ * Using the above example, this would be example.com.
+ *
+ * \code{.json}
+ * {
+ *   "success":1,
+ *   "pickup":{
+ *     "notify":{
+ *       "type":"notify",
+ *       "sender":{
+ *         "guid":"kgVFf_...",
+ *         "guid_sig":"PT9-TApz...",
+ *         "url":"http:\/\/z.podunk.edu",
+ *         "url_sig":"T8Bp7j5D..."
+ *       },
+ *       "callback":"\/post",
+ *       "version":1,
+ *       "secret":"1eaa661..."
+ *     },
+ *     "message":{
+ *       "type":"activity",
+ *       "message_id":"10b049ce384cbb2da9467319bc98169ab36290b8bbb403aa0c0accd9cb072e76@podunk.edu",
+ *       "message_top":"10b049ce384cbb2da9467319bc98169ab36290b8bbb403aa0c0accd9cb072e76@podunk.edu",
+ *       "message_parent":"10b049ce384cbb2da9467319bc98169ab36290b8bbb403aa0c0accd9cb072e76@podunk.edu",
+ *       "created":"2012-11-20 04:04:16",
+ *       "edited":"2012-11-20 04:04:16",
+ *       "title":"",
+ *       "body":"Hi Nickordo",
+ *       "app":"",
+ *       "verb":"post",
+ *       "object_type":"",
+ *       "target_type":"",
+ *       "permalink":"",
+ *       "location":"",
+ *       "longlat":"",
+ *       "owner":{
+ *         "name":"Indigo",
+ *         "address":"indigo@podunk.edu",
+ *         "url":"http:\/\/podunk.edu",
+ *         "photo":{
+ *           "mimetype":"image\/jpeg",
+ *           "src":"http:\/\/podunk.edu\/photo\/profile\/m\/5"
+ *         },
+ *         "guid":"kgVFf_...",
+ *         "guid_sig":"PT9-TAp...",
+ *       },
+ *       "author":{
+ *         "name":"Indigo",
+ *         "address":"indigo@podunk.edu",
+ *         "url":"http:\/\/podunk.edu",
+ *         "photo":{
+ *           "mimetype":"image\/jpeg",
+ *           "src":"http:\/\/podunk.edu\/photo\/profile\/m\/5"
+ *         },
+ *         "guid":"kgVFf_...",
+ *         "guid_sig":"PT9-TAp..."
+ *       }
+ *     }
+ *   }
+ * }
+ * \endcode
+ *
+ * Currently defined message types are 'activity', 'mail', 'profile', 'location'
+ * and 'channel_sync', which each have different content schemas.
+ *
+ * Ping packet:
+ * A ping packet does not require any parameters except the type. It may or may
+ * not be encrypted.
+ *
+ * \code{.json}
+ * {
+ *   "type": "ping"
+ * }
+ * \endcode
+ *
+ * On receipt of a ping packet a ping response will be returned:
+ *
+ * \code{.json}
+ * {
+ *   "success" : 1,
+ *   "site" {
+ *     "url": "http:\/\/podunk.edu",
+ *     "url_sig": "T8Bp7j5...",
+ *     "sitekey": "-----BEGIN PUBLIC KEY-----
+ *                 MIICIjANBgkqhkiG9w0BAQE..."
+ *   }
+ * }
+ * \endcode
+ *
+ * The ping packet can be used to verify that a site has not been re-installed, and to 
+ * initiate corrective action if it has. The url_sig is signed with the site private key
+ * and base64url encoded - and this should verify with the enclosed sitekey. Failure to
+ * verify indicates the site is corrupt or otherwise unable to communicate using zot.
+ * This return packet is not otherwise verified, so should be compared with other
+ * results obtained from this site which were verified prior to taking action. For instance
+ * if you have one verified result with this signature and key, and other records for this 
+ * url which have different signatures and keys, it indicates that the site was re-installed
+ * and corrective action may commence (remove or mark invalid any entries with different
+ * signatures).
+ * If you have no records which match this url_sig and key - no corrective action should
+ * be taken as this packet may have been returned by an imposter.  
+ *
+ * @param[in,out] App &$a
+ */
+