nodeinfo: this is actually host-meta
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1 changed files with 222 additions and 60 deletions
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@ -1,25 +1,62 @@
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use serde::Deserialize;
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//! Serde-based [RFC 6415] `host-meta` parser.
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//!
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//! [RFC 6415]: https://datatracker.ietf.org/doc/html/rfc6415
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use serde::{Serialize, Deserialize};
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#[derive(Debug, Clone, Deserialize)]
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pub struct Discovery {
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pub links: Vec<DiscoveryDocument>,
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/// A [host-meta document].
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///
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/// [host-meta document]: https://datatracker.ietf.org/doc/html/rfc6415
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#[derive(Debug, Clone, Serialize, Deserialize)]
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#[serde(rename_all = "PascalCase")]
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pub struct HostMetaDocument {
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/// The resource this document refers to.
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pub subject: Option<String>,
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/// Links established between the [`Self::subject`] and other resources.
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pub links: Vec<HostMetaLink>,
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}
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#[derive(Debug, Clone, Deserialize)]
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pub struct DiscoveryDocument {
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/// A [host-meta Link Element], which puts the subject resource in relation with another.
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///
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/// [host-meta Link Element]: https://datatracker.ietf.org/doc/html/rfc6415#section-3.1.1
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct HostMetaLink {
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/// The kind of relation established by the subject with the attached resource.
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pub rel: String,
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/// The resource put in relation with the subject resource.
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pub href: String,
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}
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impl Discovery {
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pub async fn get(url: reqwest::Url) -> Result<Self, DiscoveryGetError> {
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use DiscoveryGetError::*;
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impl HostMetaDocument {
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/// Get an [host-meta document] in the [JRD format].
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///
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/// This follows redirects until the redirect chain is 10 hops; see [`reqwest::redirect`] for more info.
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///
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/// [JRD format]: https://datatracker.ietf.org/doc/html/rfc6415#appendix-A
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/// [host-meta document]: https://datatracker.ietf.org/doc/html/rfc6415
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pub async fn get_jrd(client: &reqwest::Client, url: reqwest::Url) -> Result<Self, HostMetaGetJRDError> {
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use HostMetaGetJRDError::*;
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log::debug!("Getting nodeinfo discovery at: {url}");
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log::debug!("Getting host-meta JRD document at: {url}");
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log::trace!("Sending GET request to: {url}");
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let response = reqwest::get(url)
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log::trace!("Building request...");
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let request = {
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log::trace!("Creating new request...");
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let mut request = reqwest::Request::new(reqwest::Method::GET, url);
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log::trace!("Setting request headers...");
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let headers = request.headers_mut();
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log::trace!("Setting `Accept: application/json`...");
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let _ = headers.insert(reqwest::header::ACCEPT, "application/json".parse().unwrap());
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request
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};
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log::trace!("Sending request...");
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let response = client.execute(request)
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.await
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.map_err(Request)?;
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@ -32,7 +69,7 @@ impl Discovery {
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.then_some(())
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.ok_or(ContentTypeInvalid)?;
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log::trace!("Attempting to parse nodeinfo discovery as JSON...");
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log::trace!("Attempting to parse response as JSON...");
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let data = response.json::<Self>()
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.await
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.map_err(Parse)?;
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@ -40,18 +77,75 @@ impl Discovery {
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Ok(data)
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}
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const WELLKNOWN_DISCOVERY_PATH: &str = "/.well-known/nodeinfo";
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/// Get an [host-meta document] in the [XRD format].
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///
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/// This follows redirects until the redirect chain is 10 hops; see [`reqwest::redirect`] for more info.
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///
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/// [XRD format]: https://datatracker.ietf.org/doc/html/rfc6415#section-3.1
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/// [host-meta document]: https://datatracker.ietf.org/doc/html/rfc6415
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pub async fn get_xrd(client: &reqwest::Client, url: reqwest::Url) -> Result<Self, HostMetaGetXRDError> {
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use HostMetaGetXRDError::*;
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pub async fn discover(base: &reqwest::Url) -> Result<Self, DiscoveryDiscoverError> {
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use DiscoveryDiscoverError::*;
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log::debug!("Getting host-meta XRD document at: {url}");
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log::debug!("Discovering nodeinfo at base: {base}");
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log::trace!("Building request...");
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let request = {
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log::trace!("Creating new request...");
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let mut request = reqwest::Request::new(reqwest::Method::GET, url);
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let mut url = base.clone();
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log::trace!("Setting request headers...");
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let headers = request.headers_mut();
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let path = Self::WELLKNOWN_DISCOVERY_PATH;
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log::trace!("Setting URL path to `{path}`...");
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url.set_path(path);
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log::trace!("Setting `Accept: application/xrd+xml`...");
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let _ = headers.insert(reqwest::header::ACCEPT, "application/xrd+xml".parse().unwrap());
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request
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};
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log::trace!("Sending request...");
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let response = client.execute(request)
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.await
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.map_err(Request)?;
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log::trace!("Checking headers of the response...");
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response
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.headers()
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.get("Content-Type")
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.ok_or(ContentTypeMissing)?
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.eq("application/xrd+json")
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.then_some(())
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.ok_or(ContentTypeInvalid)?;
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log::trace!("Attempting to parse response as text...");
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let data = response.text()
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.await
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.map_err(Decode)?;
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log::trace!("Parsing response as XML...");
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let data = quick_xml::de::from_str::<Self>(&data)
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.map_err(Parse)?;
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Ok(data)
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}
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/// Attempt to discover the [host-meta document] at the given URL in various ways.
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///
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/// In order, this method attempts:
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/// 1. [HTTPS] [XRD](Self::get_xrd)
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/// 2. [HTTPS] [JRD](Self::get_jrd)
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/// 3. [HTTP] [XRD](Self::get_xrd)
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/// 4. [HTTP] [JRD](Self::get_jrd)
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///
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/// This follows redirects until the redirect chain is 10 hops; see [`reqwest::redirect`] for more info.
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///
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/// [host-meta document]: https://datatracker.ietf.org/doc/html/rfc6415
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/// [HTTPS]: https://datatracker.ietf.org/doc/html/rfc2818
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/// [HTTP]: https://datatracker.ietf.org/doc/html/rfc2616
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/// [JRD]: https://datatracker.ietf.org/doc/html/rfc6415#appendix-A
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pub async fn discover(client: &reqwest::Client, mut url: reqwest::Url) -> Result<Self, HostMetaDiscoverError> {
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use HostMetaDiscoverError::*;
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log::debug!("Discovering host-meta document at base: {url}");
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log::trace!("Unsetting URL query...");
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url.set_query(None);
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@ -63,17 +157,26 @@ impl Discovery {
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url.set_scheme("https")
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.map_err(UrlManipulation)?;
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log::trace!("Attempting to retrieve nodeinfo via HTTPS...");
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let https = Self::get(url.clone())
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.await;
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let https = match https {
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log::trace!("Attempting to retrieve XRD host-meta via HTTPS...");
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let https_xrd = match Self::get_xrd(client, url.clone()).await {
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Ok(data) => {
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log::trace!("HTTPS retrieval was successful, returning...");
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log::trace!("HTTPS XRD retrieval was successful, returning...");
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return Ok(data)
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}
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Err(err) => {
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log::warn!("HTTPS retrieval failed.");
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log::trace!("HTTPS XRD retrieval failed.");
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err
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}
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};
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log::trace!("Attempting to retrieve JRD host-meta via HTTPS...");
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let https_jrd = match Self::get_jrd(client, url.clone()).await {
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Ok(data) => {
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log::trace!("HTTPS JRD retrieval was successful, returning...");
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return Ok(data)
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}
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Err(err) => {
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log::trace!("HTTPS JRD retrieval failed.");
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err
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}
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};
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@ -82,57 +185,116 @@ impl Discovery {
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url.set_scheme("http")
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.map_err(UrlManipulation)?;
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log::trace!("Attempting to retrieve nodeinfo via HTTP...");
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let http = Self::get(url.clone())
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.await;
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let http = match http {
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log::trace!("Attempting to retrieve XRD host-meta via HTTP...");
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let http_xrd = match Self::get_xrd(client, url.clone()).await {
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Ok(data) => {
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log::trace!("HTTP retrieval was successful, returning...");
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log::trace!("HTTP XRD retrieval was successful, returning...");
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return Ok(data)
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}
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Err(err) => {
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log::warn!("HTTP retrieval failed.");
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log::trace!("HTTP XRD retrieval failed.");
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err
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}
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};
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log::trace!("Attempting to retrieve JRD host-meta via HTTP...");
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let http_jrd = match Self::get_jrd(client, url.clone()).await {
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Ok(data) => {
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log::trace!("HTTP JRD retrieval was successful, returning...");
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return Ok(data)
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}
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Err(err) => {
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log::trace!("HTTP JRD retrieval failed.");
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err
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}
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};
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Err(
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DiscoveryDiscoverError::Fetch(
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DiscoveryDiscoverAttemptsErrors {
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https,
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http,
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HostMetaDiscoverError::Fetch(
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HostMetaDiscoveryAttemptsErrors {
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https_xrd,
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https_jrd,
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http_xrd,
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http_jrd,
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}
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)
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)
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}
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const WELLKNOWN_NODEINFO_PATH: &str = "/.well-known/nodeinfo";
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pub async fn discover_nodeinfo(client: &reqwest::Client, mut base: reqwest::Url) -> Result<Self, HostMetaDiscoverError> {
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base.set_path(Self::WELLKNOWN_NODEINFO_PATH);
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Self::discover(client, base)
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.await
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}
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const WELLKNOWN_HOSTMETA_PATH: &str = "/.well-known/host-meta";
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pub async fn discover_hostmeta(client: &reqwest::Client, mut base: reqwest::Url) -> Result<Self, HostMetaDiscoverError> {
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base.set_path(Self::WELLKNOWN_HOSTMETA_PATH);
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Self::discover(client, base)
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.await
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}
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}
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pub enum DiscoveryGetError {
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pub enum HostMetaDiscoverError {
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/// Manipulation of the URL scheme of the given base failed.
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///
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/// See [reqwest::Url::set_scheme] for possible causes.
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UrlManipulation(()),
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/// All attempts of fetching the host-meta document failed.
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Fetch(HostMetaDiscoveryAttemptsErrors),
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}
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pub struct HostMetaDiscoveryAttemptsErrors {
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/// The error that occoured when trying to fetch the host-meta document in [XRD format] via [HTTPS].
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///
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/// [HTTPS]: https://datatracker.ietf.org/doc/html/rfc2818
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/// [XRD format]: https://datatracker.ietf.org/doc/html/rfc6415#section-3.1
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pub https_xrd: HostMetaGetXRDError,
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/// The error that occoured when trying to fetch the host-meta document in [JRD format] via [HTTPS].
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///
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/// [HTTPS]: https://datatracker.ietf.org/doc/html/rfc2818
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/// [JRD format]: https://datatracker.ietf.org/doc/html/rfc6415#appendix-A
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pub https_jrd: HostMetaGetJRDError,
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/// The error that occoured when trying to fetch the host-meta document in [XRD format] via [HTTP].
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///
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/// [HTTP]: https://datatracker.ietf.org/doc/html/rfc2616
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/// [XRD format]: https://datatracker.ietf.org/doc/html/rfc6415#section-3.1
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pub http_xrd: HostMetaGetXRDError,
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/// The error that occoured when trying to fetch the host-meta document in [JRD format] via [HTTP].
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///
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/// [HTTP]: https://datatracker.ietf.org/doc/html/rfc2616
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/// [JRD format]: https://datatracker.ietf.org/doc/html/rfc6415#appendix-A
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pub http_jrd: HostMetaGetJRDError,
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}
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pub enum HostMetaGetXRDError {
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/// The HTTP request failed.
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Request(reqwest::Error),
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/// The `Content-Type` header of the response is missing.
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ContentTypeMissing,
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/// The `Content-Type` header of the response is invalid.
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ContentTypeInvalid,
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/// The JSON document failed to be parsed.
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/// The document failed to be read as text.
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Decode(reqwest::Error),
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/// The document failed to be parsed as XML by [`quick_xml`].
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Parse(quick_xml::DeError),
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}
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pub enum HostMetaGetJRDError {
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/// The HTTP request failed.
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Request(reqwest::Error),
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/// The `Content-Type` header of the response is missing.
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ContentTypeMissing,
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/// The `Content-Type` header of the response is invalid.
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ContentTypeInvalid,
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/// The document failed to be parsed as JSON by [`reqwest`].
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Parse(reqwest::Error),
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}
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pub enum DiscoveryDiscoverError {
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/// Manipulation of the URL scheme of the given base failed.
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///
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/// See [reqwest::Url::set_scheme] for possible causes.
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UrlManipulation(()),
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/// All attempts of fetching the discovery metadata failed.
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Fetch(DiscoveryDiscoverAttemptsErrors),
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}
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pub struct DiscoveryDiscoverAttemptsErrors {
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/// The error occurred during the HTTPS request.
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pub https: DiscoveryGetError,
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/// The error occurred during the HTTP request.
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pub http: DiscoveryGetError,
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}
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