117 lines
4.1 KiB
Rust
117 lines
4.1 KiB
Rust
use crate::server::{AddVersionResult, GetVersionResult, HistorySegment, Server, VersionId};
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use std::convert::TryInto;
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use std::time::Duration;
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use uuid::Uuid;
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mod crypto;
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use crypto::{HistoryCiphertext, HistoryCleartext, Secret};
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pub struct RemoteServer {
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origin: String,
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client_key: Uuid,
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encryption_secret: Secret,
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agent: ureq::Agent,
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}
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/// A RemoeServer communicates with a remote server over HTTP (such as with
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/// taskchampion-sync-server).
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impl RemoteServer {
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/// Construct a new RemoteServer. The `origin` is the sync server's protocol and hostname
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/// without a trailing slash, such as `https://tcsync.example.com`. Pass a client_key to
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/// identify this client to the server. Multiple replicas synchronizing the same task history
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/// should use the same client_key.
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pub fn new(origin: String, client_key: Uuid, encryption_secret: Vec<u8>) -> RemoteServer {
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RemoteServer {
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origin,
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client_key,
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encryption_secret: encryption_secret.into(),
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agent: ureq::AgentBuilder::new()
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.timeout_connect(Duration::from_secs(10))
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.timeout_read(Duration::from_secs(60))
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.build(),
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}
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}
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}
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/// Read a UUID-bearing header or fail trying
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fn get_uuid_header(resp: &ureq::Response, name: &str) -> anyhow::Result<Uuid> {
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let value = resp
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.header(name)
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.ok_or_else(|| anyhow::anyhow!("Response does not have {} header", name))?;
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let value = Uuid::parse_str(value)
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.map_err(|e| anyhow::anyhow!("{} header is not a valid UUID: {}", name, e))?;
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Ok(value)
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}
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impl Server for RemoteServer {
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fn add_version(
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&mut self,
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parent_version_id: VersionId,
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history_segment: HistorySegment,
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) -> anyhow::Result<AddVersionResult> {
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let url = format!(
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"{}/v1/client/add-version/{}",
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self.origin, parent_version_id
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);
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let history_cleartext = HistoryCleartext {
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parent_version_id,
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history_segment,
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};
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let history_ciphertext = history_cleartext.seal(&self.encryption_secret)?;
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match self
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.agent
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.post(&url)
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.set(
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"Content-Type",
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"application/vnd.taskchampion.history-segment",
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)
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.set("X-Client-Key", &self.client_key.to_string())
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.send_bytes(history_ciphertext.as_ref())
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{
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Ok(resp) => {
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let version_id = get_uuid_header(&resp, "X-Version-Id")?;
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Ok(AddVersionResult::Ok(version_id))
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}
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Err(ureq::Error::Status(status, resp)) if status == 409 => {
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let parent_version_id = get_uuid_header(&resp, "X-Parent-Version-Id")?;
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Ok(AddVersionResult::ExpectedParentVersion(parent_version_id))
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}
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Err(err) => Err(err.into()),
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}
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}
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fn get_child_version(
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&mut self,
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parent_version_id: VersionId,
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) -> anyhow::Result<GetVersionResult> {
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let url = format!(
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"{}/v1/client/get-child-version/{}",
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self.origin, parent_version_id
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);
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match self
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.agent
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.get(&url)
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.set("X-Client-Key", &self.client_key.to_string())
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.call()
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{
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Ok(resp) => {
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let parent_version_id = get_uuid_header(&resp, "X-Parent-Version-Id")?;
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let version_id = get_uuid_header(&resp, "X-Version-Id")?;
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let history_ciphertext: HistoryCiphertext = resp.try_into()?;
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let history_segment = history_ciphertext
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.open(&self.encryption_secret, parent_version_id)?
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.history_segment;
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Ok(GetVersionResult::Version {
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version_id,
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parent_version_id,
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history_segment,
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})
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}
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Err(ureq::Error::Status(status, _)) if status == 404 => {
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Ok(GetVersionResult::NoSuchVersion)
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}
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Err(err) => Err(err.into()),
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}
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}
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}
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