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A Quick Overview of the Protocol Stack Adding support for new architectures in Tor Android Accessibility Android Power Management BDF BSP BTP Blog Client Blog Sharing Client Client API Notes Connect at a distance Create Account Design options for multi block messages Development schedule for private message deletion FAQ Field Guide Forum Client Forum Sharing Client Forums Fundamental Problems How Briar Connects to Contacts Introduction Client Mailbox Architecture Mailbox Properties Client Mailbox Scenarios Mailbox cannot reach Briar Messaging Client Navigate away from sharing screen Private Group Client Private Group Sharing Client Profile pictures Quick Start Guide RPC Notes Release Test Plan Roadmap Self destructing messages tests Software bill of materials for private message deletion Sponsor 1 Testing Translation Workflow Transport Key Agreement Client Transport Properties Client add already added contact at distance add contact after time out add contact at distance one contact offline add contact on biar received via hotspot add contact whilst pending contacts add nearby contact bluetooth off add nearby contact that was already added at distance add nearby contact then reconnect via BT add nearby contact twice app in background while do not kill me fragment displayed application lifecycle autostart mailbox on reboot when mailbox set up not completed yet autostart mailbox on reboot when mailbox set up blogs bluetooth setup screen briar connections opens from device view app settings briar in background during sharing briar mailbox test coverage briar mailbox tests executed cancel setup changelog code style comparative test several devices location and wifi settings connect multiple devices to hotspot connect with nearby contact create account on shared briar app delete and recreate contact at distance delete recreate nearby contact deny briar access to location many times deny briar access to location development 101 development workflow device offline warning devices tested disappearing messages sent to direct contacts download app scan QR code download type address manually error handling mailbox uploads feature workflow first install do not kill me fragment fresh install add contact distance reconnect via BT fresh install add nearby contact BT reconnect BT home import somebody elses messages install first time interrupt scanning qr code interrupt unlinking from briar side introductions multiple contacts disapp msgs on off invite multiple contacts to private group location off during contact creation mailbox in briar settings mailbox is running mailbox no internet mailbox not reachable mailbox notifications mailbox onboarding screens scan QR Code mailbox onboarding screens share link mailbox strings translations mailbox success screen mailbox system clock in the future mailbox system clock in the past mailbox test coverage mailbox wiping complete screen main activity reset everything to initial state make intro dis msgs on autodecline make introductions disappearing messages on intro accepted make introductions disappearing messages on intro declined by both make introductions disappearing messages on intro declined by one make introductions disappearing messages on make introductions disappearing messages onoff intro accepted make introductions disappearing messages onoff intro decl autodecl by both manually change battery optimisation setting to ON manually change battery optimisation setting to off message upload both x and y have mailboxes messages as expected no mailbox messages removable media mailbox messages uploaded Y knows x has mb messages uploaded to mailbox correctly mialbox not reachable nearby contact no mailbox autostart on reboot when QRcode scan canceled no mailbox autostart on reboot when mailbox stopped by user notes on testing notification mailbox unreachable disappears after tapping notification mailbox unreachable disappears when mailbox reachable notification mailbox unreachable disappears when mailbox unlinked notification mailbox unreachable onboarding UI open battery settings open hotspot manually open hotspot scan qr code permissions pre review checklist private group invitations messages product backlog re add deleted contact reconnect via BT reboot briar device after QR code scan receive messages during contact creation reconnect via BT when BT = OFF reconnect via BT when Briar BT OFF and device BT OFF device location OFF Briar no access to location reconnect via BT when Briar BT OFF and device BT OFF device location OFF reconnect via BT when Briar BT OFF and device BT OFF reconnect via BT reimport imported messages remove nearby devices permissions and start app reopen mailbox after device goes to sleep restart mailbox after wiping do not keep activities rotate screen whilst adding contact at distance scan incorrect qr code scan qr code scan valid QR code more than once self destructing messages share app briar access to location OFF share app device location OFF share app device wifi OFF share app offline share app wifi in briar OFF signed commits stop mailbox stop sharing after download stop sharing before download finished threat model time last connected tor build process tor port transfer blog posts transfer direct messages transfer forum posts transfer introductions transfer messages with images unlink from briar side mailbox already unlinked unlink from briar side mailbox offline unlink from briar side unlink mailbox side when briar offline unlink mailbox side when briar online unlink mailbox upload new contacts to mailbox user allows connections and rotates screen user allows connections user leaves setup
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messages removable media mailbox
Ivana edited this page 2022-03-29 12:29:05 +00:00

If messages are exported to removable media, but not uploaded and acked yet, then they can also be uploaded to mailbox and vice versa.

https://code.briarproject.org/briar/briar/-/issues/2265

This depends on 'latency period', which means that messages exported to the removable media can also be uploaded to the mailbox before the mailbox 'latency period' expires.

Let's say that mailbox latency period is 14 days, and the removable media 28 days.

Then we have the following scenarios -

Sender

is online msg type has MB MB online exports msg before/after MB upload receives acks ack medium
yes text yes yes yes after yes MB
yes photo yes yes yes after yes Rem Media
yes profile pic yes no yes before yes Rem Media
no make intro yes yes yes before yes MB

Recipient1

is online msg type has MB MB online exports ack before/afterMB upload
no text yes yes yes na
no photo yes yes yes after
no profile pic no yes yes after
yes make intro yes yes no na

Scenario 1 Recipient receives message from the removable media, but sends ack via mailbox In this scenarios, a text message is created by the sender, and they have a MB which is available online. So the message they created is uploaded to their mailbox.

  • The message is not downloaded - let's say that the intended recipient is offline and cannot download the message
  • The sender can export the same message onto the removable media.
  • The sender goes offline after this
  • The recipient can upload the message from the removable media.
  • The recipient comes back online
  • The recipient's mailbox is online, which means that the ack their Briar app generates will be uploaded onto their MB
  • Before sender comes back online, recipient is able to export the ack onto the removable media
  • Sender comes back online and received the ack from the recipient's mailbox
  • The message that the sender sent to the recipient now has 2 ticks
  • Sender tries to import the ack from the removable media, but cannot (as the ack was already downloaded from the MB)

Scenario 2

Sender

is online msg type has MB MB online exports msg before/after MB upload receives acks ack medium
yes photo yes yes yes after yes Rem Media

Recipient

is online msg type has MB MB online exports ack before/afterMB upload
no photo yes yes yes after

Recipient receives message from sender's mailbox and sends ack via removable media

  • a photo message is created by the sender, and this message is uploaded to their mailbox as the intended recipient is offline.
  • Sender goes offline
  • Recipient comes online, and receives a message from the sender's mailbox
  • Thier own ack is generated automatically and ploaded to their own mailbox, as the sender is now offline.
  • The recipient exports the ack to removable media
  • The sender imports the ack from the removable media and the message gets the second tick
  • The sender comes back online
  • at this point the ack sent to them by the recipient's mailbox should be downloadd and deleted - but for the user this is transparent - they don't see any changes on their screen while this is being done.
  • Now both recipient and the sender of the original message are online and they message each other directly, without messages passing through MB

Scenarios 3 In this scenario sender has a MB which is offline initially, so their only option is to export the messages for the intended recipient who is also offline initially. The intended recipient does not have the MB app, so they can only import the message from removable media.
Sender

is online msg type has MB MB online exports msg before/after MB upload receives acks ack medium
yes profile pic yes no yes before yes Rem Media

Recipient

is online msg type has MB MB online exports ack before/afterMB upload
no profile pic no yes yes after
  • sender sends a message via removable media, as their own mailbox is offline
  • recipient is offline, does not have MB and imports the message from the removable media.
  • at this point the sender's mailbox comes back online, and the exported message gets uploaded to the sender's MB
  • it tries to forward the message to the recipient, who is still offline
  • sender goes offline
  • recipient comes back online
  • sender's mailbox will now try to forward them the message that they already uploaded from the removable media
  • For the user, this is transparent, but the message should be donwloaded and deleted
  • the recipient exports the ack
  • the sender imports the ack from the removable media
  • the sender comes back online and can message the recipient directly, and recipient receives messages, generates acks and sends messages as normal.
  • recipient comes back online

Scenario 4

In this scenario we check what will happen in a more complex situation where some recipients have a mailbox and some do not

Sender

is online msg type has MB MB online exports msg before/after MB upload receives acks ack medium
no make intro yes yes yes before yes MB

Recipient1

is online msg type has MB MB online exports ack before/afterMB upload
yes make intro yes yes no na

Recipient2

is online msg type has MB MB online exports ack before/afterMB upload
no make intro no na yes na

The message sender is offline, and they want to make intro between two contacts.

  • sender exports the 'make intro' message to recipient1, who is online
  • recipient1 imports the 'make intro' message from removable media, and accepts the intro
  • sender comes online and their 'make intro' message to recipient2 is uploaded to their mailbox.
  • sender receives the ack from recipient 1
  • sender goes offline
  • recipient 2 is offline, therefore they cannot receive the 'make intro' message from the sender's malbox
  • sender exports the 'make intro' message onto removable media
  • recipient 2 imports the 'make intro' message from removable media
  • recipient2 comes back online
  • recipient2 denlines the 'make intro' but this cannot be sent, as the sender is offline - so this decline can be exported either to removable media or to mailbox.
  • recipient 2 installs the mailbox and pairs it with their briar app
  • the decline 'make intro' message is uploaded to their mailbox
  • sender comes back online
  • they receive the decline via the recipient 2's mailbox

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