aqua TrustGraphApi declares *

export set_root, issue_trust, import_trust
export add_trust, add_root_trust, verify_trust
export get_weight, get_weight_from, issue_revocation
export import_revocation, revoke, get_host_certs_from
export get_all_certs, get_all_certs_from, get_host_certs
export insert_cert

import Sig, Peer, PeerId from "@fluencelabs/aqua-lib/builtin.aqua"
import "misc.aqua"
import "trust-graph.aqua"

alias Error: string

-- Call context: any node with registered `trust-graph` service
-- Set `peer_id` as a root
-- Self-signed trust should be added in next call for correct behaviour
-- `max_chain_len` specifies maximum chain length after root trust,
-- if `max_chain_len` is zero there is no trusts except self-signed root trust in certificates for this root
func set_root(peer_id: PeerId, max_chain_len: u32) -> SetRootResult:
    result <- TrustGraph.set_root(peer_id, max_chain_len)
    <- result

-- Call context: %init_peer_id%
-- Create on relay and sign trust on client
-- If `issuer` is not %init_peer_id%, Sig service with `issuer` peer id as service id should be defined
-- Errors:
--  If TrustGraph.get_trust_bytes or TrustGraph.issue_trust fails, (nil, error) is returned.
func issue_trust(issuer: PeerId, issued_for: PeerId, expires_at_sec: u64) -> ?Trust, ?Error:
    -- after marine-web release this will be done on %init_peer_id%
    on HOST_PEER_ID:
        issued_at_sec <- Peer.timestamp_sec()
        bytes <- TrustGraph.get_trust_bytes(issued_for, expires_at_sec, issued_at_sec)

    result: *Trust
    error: *Error
    if bytes.success:
        Sig issuer
        sig_res <- Sig.sign(bytes.result)

        if sig_res.success:
            on HOST_PEER_ID:
                issue_result <- TrustGraph.issue_trust(issued_for, expires_at_sec, issued_at_sec, sig_res.signature!)
            if issue_result.success:
                result <<- issue_result.trust
            else:
                error <<- issue_result.error
        else:
            error <<- sig_res.error!
    else:
        error <<- bytes.error

    <- result, error

-- Call context: any node with registered `trust-graph` service
-- Add trust to TG
-- Errors:
--  If TrustGraph.add_trust fails, error is returned.
func import_trust(trust: Trust, issuer: PeerId) -> ?Error:
    error: *Error
    timestamp_sec <- Peer.timestamp_sec()
    add_result <- TrustGraph.add_trust(trust, issuer, timestamp_sec)
    if !add_result.success:
        error <<- add_result.error

    <- error

-- Call context: %init_peer_id%
-- Issue trust and add to TG instance on `node`
-- If `issuer` is not %init_peer_id%, Sig service with `issuer` peer id as service id should be defined
-- Errors:
--  If issue_trust or import_trust fails, error is returned.
func add_trust(node: PeerId, issuer: PeerId, issued_for: PeerId, expires_at_sec: u64) -> ?Error:
    trust, issue_error <- issue_trust(issuer, issued_for, expires_at_sec)

    error: *Error
    if issue_error != nil:
        error <<- issue_error!
    else:
        on node:
            import_error <- import_trust(trust!, issuer)
            append_error(error, import_error)

    <- error

-- Call context: %init_peer_id%
-- Set `peer_id` as a root and add self-signed trust to TG instance on `node`
-- If `peer_id` is not %init_peer_id%, Sig service with `peer_id` as service id should be defined
-- Errors:
--  If issue_trust, import_trust or set_root fails, error is returned.
func add_root_trust(node: PeerId, peer_id: PeerId, max_chain_len: u32, expires_at_sec: u64) -> ?Error:
    trust, issue_error <- issue_trust(peer_id, peer_id, expires_at_sec)

    error: *Error
    if issue_error != nil:
        error <<- issue_error!
    else:
        on node:
            set_root_result <- set_root(peer_id, max_chain_len)
            if set_root_result.success:
                import_error <- import_trust(trust!, peer_id)
                append_error(error, import_error)
            else:
                error <<- set_root_result.error

    <- error

-- Call context: any node with registered `trust-graph` service
-- Check signature and expiration time of trust
func verify_trust(trust: Trust, issuer: PeerId) -> VerifyTrustResult:
    timestamp_sec <- Peer.timestamp_sec()
    result <- TrustGraph.verify_trust(trust, issuer, timestamp_sec)

    <- result

-- Call context: any node with registered `trust-graph` service
-- Get the maximum weight of trust for `peer_id`
-- Trust has weight if there is at least 1 trust chain from one of the roots
func get_weight(peer_id: PeerId) -> WeightResult:
    timestamp_sec <- Peer.timestamp_sec()
    result <- TrustGraph.get_weight(peer_id, timestamp_sec)

    <- result

-- Call context: any node with registered `trust-graph` service
-- Get maximum weight of trust for `peer_id` among all chains which contain trust from `issuer`
func get_weight_from(peer_id: PeerId, issuer: PeerId) -> WeightResult:
    timestamp_sec <- Peer.timestamp_sec()
    result <- TrustGraph.get_weight_from(peer_id, issuer, timestamp_sec)

    <- result

-- Call context: %init_peer_id%
-- Create revocation signed by %init_peer_id%
-- If `revoked_by` is not %init_peer_id%, Sig service with `revoked_by` peer id as service id should be defined
-- Errors:
--  If TrustGraph.get_revocation_bytes or TrustGraph.issue_revocation fails, (nil, error) is returned.
func issue_revocation(revoked_by: PeerId, revoked: PeerId) -> ?Revocation, ?Error:
    -- after marine-web release this will be done on %init_peer_id%
    on HOST_PEER_ID:
        issued_at_sec <- Peer.timestamp_sec()
        bytes <- TrustGraph.get_revocation_bytes(revoked, issued_at_sec)

    result: *Revocation
    error: *Error
    if bytes.success:
        Sig revoked_by

        sig_res <- Sig.sign(bytes.result)

        if sig_res.success:
            on HOST_PEER_ID:
                issue_result <- TrustGraph.issue_revocation(revoked_by, revoked, issued_at_sec, sig_res.signature!)
            if issue_result.success:
                result <<- issue_result.revocation
            else:
                error <<- issue_result.error
        else:
            error <<- sig_res.error!
    else:
        error <<- bytes.error

    <- result, error

-- Call context: any node with registered `trust-graph` service
-- Import revocation to TG
-- Errors:
--  If TrustGraph.revoke fails, error is returned.
func import_revocation(revocation: Revocation) -> ?Error:
    error: *Error
    timestamp_sec <- Peer.timestamp_sec()
    add_result <- TrustGraph.revoke(revocation, timestamp_sec)
    if !add_result.success:
        error <<- add_result.error

    <- error

-- Call context: %init_peer_id%
-- Revoke all certificates on `node` TG instance
-- which contain path from %init_peer_id% to `revoked_peer_id`
-- If `revoked_by` is not %init_peer_id%, Sig service with `revoked_by` peer id as service id should be defined
-- Errors:
--  if issue_revocation or import_revocation fails, error is returned.
func revoke(node: PeerId, revoked_by: PeerId, revoked: PeerId) -> ?Error:
    revocation, issue_error <- issue_revocation(revoked_by, revoked)

    error: *Error
    if revocation == nil:
        error <<- issue_error!
    else:
        on node:
           import_error <- import_revocation(revocation!)
           append_error(error, import_error)

    <- error

-- Call context: any node with registered `trust-graph` service
-- Return all certificates issued for current node which contains trust from `issuer`
func get_host_certs_from(issuer: PeerId) -> AllCertsResult:
    timestamp_sec <- Peer.timestamp_sec()
    result <- TrustGraph.get_host_certs_from(issuer, timestamp_sec)

    <- result

-- Call context: any node with registered `trust-graph` service
-- Return all certificates issued for given peer id
func get_all_certs(issued_for: PeerId) -> AllCertsResult:
    timestamp_sec <- Peer.timestamp_sec()
    result <- TrustGraph.get_all_certs(issued_for, timestamp_sec)

    <- result

-- Call context: any node with registered `trust-graph` service
-- Return all certificates issued for given peer id which contains trust from `issuer`
func get_all_certs_from(issued_for: PeerId, issuer: PeerId) -> AllCertsResult:
    timestamp_sec <- Peer.timestamp_sec()
    result <- TrustGraph.get_all_certs_from(issued_for, issuer, timestamp_sec)

    <- result

-- Call context: any node with registered `trust-graph` service
-- Return all certificates issued for current node
func get_host_certs() -> AllCertsResult:
    timestamp_sec <- Peer.timestamp_sec()
    result <- TrustGraph.get_host_certs(timestamp_sec)

    <- result

-- Call context: any node with registered `trust-graph` service
-- Insert certificate to TG instance on current node
func insert_cert(certificate: Certificate) -> InsertResult:
    timestamp_sec <- Peer.timestamp_sec()
    result <- TrustGraph.insert_cert(certificate, timestamp_sec)
    
    <- result