Function is_dpop_error 

pub fn is_dpop_error(value: &str) -> bool

Parses the value of the “WWW-Authenticate” header and returns true if the inner “error” field is either “invalid_dpop_proof” or “use_dpop_nonce”.

This function parses DPoP challenge headers to determine if the server is requesting a DPoP proof or indicating that the provided proof is invalid.

Arguments

• value - The WWW-Authenticate header value to parse

Returns

• true if the error field indicates a DPoP-related error
• false if no DPoP error is found or the header format is invalid

Examples

use atproto_oauth::dpop::is_dpop_error;

// Valid DPoP error: invalid_dpop_proof
let header1 = r#"DPoP algs="ES256", error="invalid_dpop_proof", error_description="DPoP proof required""#;
assert!(is_dpop_error(header1));

// Valid DPoP error: use_dpop_nonce  
let header2 = r#"DPoP algs="ES256", error="use_dpop_nonce", error_description="Authorization server requires nonce in DPoP proof""#;
assert!(is_dpop_error(header2));

// Non-DPoP error
let header3 = r#"DPoP algs="ES256", error="invalid_token", error_description="Token is invalid""#;
assert!(!is_dpop_error(header3));

// Non-DPoP authentication scheme
let header4 = r#"Bearer error="invalid_token""#;
assert!(!is_dpop_error(header4));