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The blog sharing client is a [BSP client](BSP) that allows users to share blogs with their contacts, who may accept or decline the invitations.
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The blog sharing client is a [BSP client](BSP) that allows users to share blogs with their contacts, who may accept or decline the invitations. It is used in conjunction with the [blog client](blog client).
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### Group identifiers
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### Identifier
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The client's identifier is `org.briarproject.briar.blog.sharing`.
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The client's identifier is `org.briarproject.briar.blog.sharing`. The major version is 0.
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The client uses a separate BSP group for each pair of contacts. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
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### Groups
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The client uses a separate BSP group for communicating with each contact. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
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### Roles
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All communication happens between two contacts, who have symmetrical roles.
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### Sessions
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The messages exchanged between two contacts referring to a given blog constitute a session. The blog's unique ID is used as the session ID.
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### Message types
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### Message types
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The sharing protocol uses five message types. All communication happens between two contacts, who have symmetrical roles. The messages referring to each blog constitute a session.
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The protocol uses five message types.
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**0: INVITE** - Sent by either party to start or restart a session. The message body is a BDF list with four elements: `messageType` (int), `previousMessageId` (unique ID or null), `descriptor` (list), and `message` (string or null).
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**0: INVITE** - Sent by either party to start or restart a session. The message body is a BDF list with four elements: `messageType` (int), `previousMessageId` (unique ID or null), `descriptor` (list), and `message` (string or null).
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