vade-didcomm 0.3.0

DIDComm communication helper for vade
Documentation 
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use super::datatypes::PROPOSAL_PROTOCOL_URL;
use crate::{
    datatypes::{HasFromAndTo, MessageWithBody},
    protocols::{
        present_proof::{
            datatypes::{PresentationData, ProposalData, RequestData, State, UserType},
            presentation::{get_current_state, save_presentation, save_state},
        },
        protocol::{generate_step_output, StepResult},
    },
};

/// Protocol handler for direction: `send`, type: `PRESENT_PROOF_PROTOCOL_URL/presentation`
pub fn send_presentation(_options: &str, message: &str) -> StepResult {
    let presentation_message: MessageWithBody<PresentationData> = serde_json::from_str(message)?;
    let presentation_data = presentation_message
        .body
        .as_ref()
        .ok_or("missing presentation data in body")?;
    let from_to = presentation_message.get_from_to()?;
    let thid = presentation_message
        .thid
        .as_ref()
        .ok_or("Thread id can't be empty")?;

    let current_state: State = get_current_state(thid, &UserType::Prover)?.parse()?;
    match current_state {
        State::PresentationRequestReceived => {
            save_state(thid, &State::PresentationSent, &UserType::Prover)?
        }
        _ => {
            return Err(Box::from(format!(
                "Error while processing step: State from {} to {} not allowed",
                current_state,
                State::PresentationSent
            )))
        }
    };

    save_presentation(
        &from_to.from,
        &from_to.to,
        thid,
        &serde_json::to_string(&presentation_data)?,
        &State::PresentationSent,
    )?;

    generate_step_output(&serde_json::to_string(&presentation_message)?, "{}")
}

/// Protocol handler for direction: `receive`, type: `PRESENT_PROOF_PROTOCOL_URL/request_presentation`
pub fn receive_request_presentation(_options: &str, message: &str) -> StepResult {
    let request_message: MessageWithBody<RequestData> = serde_json::from_str(message)?;
    let request_data = request_message
        .body
        .as_ref()
        .ok_or("missing request data in body")?;
    let from_to = request_message.get_from_to()?;
    let thid = request_message
        .thid
        .to_owned()
        .ok_or("Thread id can't be empty")?;

    let current_state: State = get_current_state(&thid, &UserType::Prover)?.parse()?;
    match current_state {
        State::PresentationProposed | State::Unknown => save_state(
            &thid,
            &State::PresentationRequestReceived,
            &UserType::Prover,
        )?,
        _ => {
            return Err(Box::from(format!(
                "Error while processing step: State from {} to {} not allowed",
                current_state,
                State::PresentationRequestReceived
            )))
        }
    };

    save_presentation(
        &from_to.to,
        &from_to.from,
        &thid,
        &serde_json::to_string(&request_data)?,
        &State::PresentationRequestReceived,
    )?;

    generate_step_output(message, "{}")
}

/// Protocol handler for direction: `send`, type: `PRESENT_PROOF_PROTOCOL_URL/propose-presentation`
pub fn send_propose_presentation(_options: &str, message: &str) -> StepResult {
    let proposal_message: MessageWithBody<ProposalData> = serde_json::from_str(message)?;
    let proposal_data = proposal_message
        .body
        .as_ref()
        .ok_or("missing proposal data in body")?;
    if proposal_data.presentation_proposal.r#type != PROPOSAL_PROTOCOL_URL {
        return Err(Box::from(format!(
            r#"invalid type in proposal: "{}", must be "{}"#,
            &proposal_data.presentation_proposal.r#type, PROPOSAL_PROTOCOL_URL
        )));
    }
    let from_to = proposal_message.get_from_to()?;
    let thid = proposal_message
        .thid
        .as_ref()
        .ok_or("Thread id can't be empty")?;

    let current_state: State = get_current_state(thid, &UserType::Prover)?.parse()?;

    match current_state {
        State::PresentationRequestReceived | State::Unknown => {
            save_state(thid, &State::PresentationProposed, &UserType::Prover)?
        }
        _ => {
            return Err(Box::from(format!(
                "Error while processing step: State from {} to {} not allowed",
                current_state,
                State::PresentationProposed
            )))
        }
    };

    save_presentation(
        &from_to.from,
        &from_to.to,
        thid,
        &serde_json::to_string(&proposal_data)?,
        &State::PresentationProposed,
    )?;

    generate_step_output(&serde_json::to_string(&proposal_message)?, "{}")
}