Struct csaf_walker::metadata::MetadataRetriever

pub struct MetadataRetriever {
    pub base_url: String,
}

A metadata source implementing the CSAF metadata discovery process.

Fields

base_url: String

Implementations

impl MetadataRetriever

pub fn new(base_url: impl Into<String>) -> Self

pub async fn get_metadata_url_from_security_text( fetcher: &Fetcher, host_url: String ) -> Result<Option<Url>, Error>

Fetch a security.txt and extract all CSAF entries.

In order for a CSAF entry to be considered, it needs to have a scheme of https and parse as a URL.

pub async fn approach_full_url( &self, fetcher: &Fetcher ) -> Result<Option<ProviderMetadata>, Error>

Treat the source as a URL and try to retrieve it

If the source is not a URL, we consider it “not found”. If the URL parses but cannot be found, that’s an error.

pub async fn approach_well_known( &self, fetcher: &Fetcher ) -> Result<Option<ProviderMetadata>, Error>

Retrieve provider metadata through the full well-known URL.

If retrieving the constructed URL returns a 404, we succeed with Ok(None).

pub async fn approach_dns( &self, fetcher: &Fetcher ) -> Result<Option<ProviderMetadata>, Error>

Retrieve provider metadata through the DNS path of provided URL.

As it is hard to detect a “host not found” error, compared to any other connection error, we do a DNS pre-flight check. If the hostname resolves into an IP address, we assume the following HTTP request should not fail due to a “host not found” error.

pub async fn approach_security_txt( &self, fetcher: &Fetcher, path: &str ) -> Result<Option<ProviderMetadata>, Error>

Retrieving provider metadata via the security text from the provided URL.

This takes the source as domain, and the provided path to compose a URL. If the security.txt cannot be found or doesn’t contain a valid CSAF entry, it will return Ok(None).

Trait Implementations

impl Clone for MetadataRetriever

fn clone(&self) -> MetadataRetriever

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl MetadataSource for MetadataRetriever

fn load_metadata<'life0, 'life1, 'async_trait>( &'life0 self, fetcher: &'life1 Fetcher ) -> Pin<Box<dyn Future<Output = Result<ProviderMetadata, Error>> + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,