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--- peonect:usecases:messenger [2025/01/05 11:29] – [Privacy (aka Mail mode)] arie
+++ peonect:usecases:messenger [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1
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-====== Messenger ======
-Frequently there is a need to communicate with People with same interests or located in the same area. Examples:
-  * a hotel guest might want to discover groups of the hotel
-  * at some event men want to organize Minyan and want a way to agree on time and place
-  * a lost child or item was found and want to announce that in "Lost and Found" group of the area
-  * a person wants to discuss some public event with like-minders
-For matter of the Machon Tal Term Project Success, the POC would allow flow below:
-  - A person creates "stored query" with properties below:
-      * kind: Messages
-      * with date not older than week ago
-      * geo: X,Y with radius R
-      * query lifetime for the next 2 hours
-  - He reviews results and sees summary of Messages found, grouped by topic name and number of unique posters (implying activity) and wants to subscribe to certain topic:
-      * he creates folder with "chat view" Memo with the topic id, and exports it
-      * the Memo automatically creates "stored query" for Memos of kind:Message, date not older than week ago and that topic id
-      * any message Memo he creates will contain same topic id, and get consumed by other subscribers
-      * he might want to enable popup notification on every incoming message
-The scenario above might be extended to cover more cases like these:
-  * ignore someone that posts offensive content
-  * send message about group details to someone ("Invite them")
-  * propose "group" icon that allows voting. The one with most votes is shown as "group" logo
-===== Privacy (aka Mail mode aka "shared" folder) =====
-There might be need to for private Memos exchange between two or more parties. In this flow, the sites are essentially **"notifying" others what changes they are suggested to do in their own copy of the folder**:
-   - An public/private keypair is created **by each participant of the folder**
-  - For each recipient, the keypair is encrypted with his public key and Memo of kind "KeyPair" and recipient id is created
-  - Recipients has active subscription to all Memos of kind "KeyPair" and recipient equals his id
-  - recipient receives the "KeyPair" Memo, decrypts it and stores in his keyring.
-  - recipient subscribes to all Memo of kind "Encrypted" and id=hashed keyring, instructs the system to put incoming Memos into speicific folder.
-At this point the folder of each participant is empty, all participants have** their own empty folder**  and they are subscribed to each other on suggested updates to the folder. Thus every change to the folder content has two flows below:
-For change initiator:
-  - Local Memo is "encrypted" and exported as blob
-  - Reference to the blob it is added to the local folder. The epoch is bumped, folder is encrypted using the keyring and exported
-For change recipients
-  - Blob of kind "Encrypted" and id=hashed arrives
-  - Assert Epoch is one-next than the currently known one, abort if not
-  - unpack the blob, **replace **content (e.g. references) of the existing folder