57 lines
1.6 KiB
Rust
57 lines
1.6 KiB
Rust
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//! Blob utilities which do not require RPC calls.
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//!
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//! Offers the following functions:
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//!
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//! - [`get_blob_path()`]
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use crate::error::GolgiError;
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/// Lookup the filepath for a blob.
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///
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/// # Example
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///
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/// ```rust
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/// use golgi::blobs;
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///
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/// fn lookup_blob_path() -> Result<(), GolgiError> {
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/// let blob_ref = "&JlJHc9yeG1EpZA9fIPGLzUKDH0FeR39Ai57euhKT1G8=.sha256";
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///
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/// let blob_path = blobs::get_blob_path(blob_ref)?;
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///
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/// println!("{}", blob_path);
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///
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/// // 26/524773dc9e1b5129640f5f20f18bcd42831f415e477f408b9edeba1293d46f
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///
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/// Ok(())
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/// }
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/// ```
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pub fn get_blob_path(blob_id: &str) -> Result<String, GolgiError> {
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let dot_index = blob_id.rfind('.').ok_or_else(|| {
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GolgiError::SigilLink(format!(
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"Invalid blob ID; no dot index was found: {}",
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blob_id
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))
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})?;
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// obtain the base64 portion (substring) of the blob id
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let base64_str = &blob_id[1..dot_index];
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// decode blob substring from base64 (to bytes)
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let blob_bytes = base64::decode_config(base64_str, base64::STANDARD)?;
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// represent the blob bytes as hex, removing all unnecessary characters
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let blob_hex = format!("{:02x?}", blob_bytes)
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.replace('[', "")
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.replace(']', "")
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.replace(',', "")
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.replace(' ', "");
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// split the hex representation of the decoded base64
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// this is how paths are formatted for the blobstore
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// e.g. 26/524773dc9e1b5129640f5f20f18bcd42831f415e477f408b9edeba1293d46f
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// full path would be: `/home/user/.ssb-go/blobs/sha256/26/524773dc...`
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let blob_path = format!("{}/{}", &blob_hex[..2], &blob_hex[2..]);
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Ok(blob_path)
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}
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