feat(pdftract-udo67): implement URL credential parsing
Add extract_url_credentials() function to parse HTTPS URLs with embedded credentials (https://user:pass@host/path). Returns cleaned URL without credentials and optional (username, password) tuple. - Rejects http:// URLs with embedded creds (HTTP Basic over plain HTTP) - Preserves percent-encoding per url crate 2.5 behavior - Adds 9 unit tests covering all acceptance criteria Closes: pdftract-udo67 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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jedarden
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@ -10,6 +10,9 @@
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//!
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//! URLs targeting these addresses are rejected unless the `--allow-private-networks`
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//! flag is set.
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//!
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//! This module also provides URL credential parsing for HTTPS URLs with embedded
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//! credentials (e.g., `https://user:pass@host/path`).
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use crate::diagnostics::{Diagnostic, DiagCode};
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use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
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@ -51,6 +54,76 @@ impl std::error::Error for UrlValidationError {}
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/// Result type for URL validation.
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pub type Result<T> = std::result::Result<T, UrlValidationError>;
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/// Extract URL credentials from an HTTPS URL.
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///
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/// Parses URLs of the form `https://user:pass@host/path` and returns:
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/// - The cleaned URL (without credentials)
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/// - Optional credentials tuple (username, password)
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///
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/// # Arguments
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///
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/// * `url_str` - The URL string to parse
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///
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/// # Returns
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///
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/// Returns `Ok((clean_url, creds))` where `clean_url` is the URL without credentials
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/// and `creds` is `Some((username, password))` if credentials were present, or `None`.
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///
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/// # Errors
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///
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/// Returns `Err(UrlValidationError::InvalidUrl)` if the URL is malformed.
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/// Returns `Err(UrlValidationError::InvalidScheme)` if the URL is `http://` with embedded
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/// credentials (HTTP Basic over plain HTTP is forbidden).
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///
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/// # Examples
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///
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/// ```rust
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/// use pdftract_core::url_validation::extract_url_credentials;
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///
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/// // URL with credentials
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/// let (clean, creds) = extract_url_credentials("https://alice:secret@example.com/doc.pdf").unwrap();
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/// assert_eq!(clean, "https://example.com/doc.pdf");
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/// assert_eq!(creds, Some(("alice".to_string(), "secret".to_string())));
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///
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/// // URL without credentials
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/// let (clean, creds) = extract_url_credentials("https://example.com/doc.pdf").unwrap();
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/// assert_eq!(clean, "https://example.com/doc.pdf");
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/// assert_eq!(creds, None);
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///
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/// // HTTP with credentials is rejected
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/// assert!(extract_url_credentials("http://alice:secret@example.com/doc.pdf").is_err());
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/// ```
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#[cfg(feature = "remote")]
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pub fn extract_url_credentials(url_str: &str) -> std::result::Result<(String, Option<(String, String)>), UrlValidationError> {
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let url = url::Url::parse(url_str)
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.map_err(|_| UrlValidationError::InvalidUrl(url_str.to_string()))?;
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// Reject http:// URLs with embedded credentials
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if url.scheme() == "http" && !url.username().is_empty() {
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return Err(UrlValidationError::InvalidScheme(
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"http:// URLs with embedded credentials are forbidden (HTTP Basic over plain HTTP is insecure)".to_string()
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));
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}
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// Extract credentials if present
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// Per RFC 7617 (HTTP Basic), credentials must be percent-decoded before base64-encoding
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let creds = if !url.username().is_empty() {
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let username = url.username().to_string();
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let password = url.password().unwrap_or("").to_string();
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Some((username, password))
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} else {
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None
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};
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// Reconstruct URL without credentials
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let mut clean = url.clone();
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// set_username returns Err if the scheme doesn't support auth, but we want to ignore that
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let _ = clean.set_username("");
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let _ = clean.set_password(None);
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Ok((clean.to_string(), creds))
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}
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/// Check if an IPv4 address is in a private network range.
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///
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/// This checks RFC 1918 private addresses:
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@ -380,4 +453,78 @@ mod tests {
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let result = validate_url("https://metadata.google.internal/", false);
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assert!(matches!(result, Err(UrlValidationError::PrivateNetwork(_))));
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_with_creds() {
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let (clean, creds) = extract_url_credentials("https://alice:secret@example.com/doc.pdf").unwrap();
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assert_eq!(clean, "https://example.com/doc.pdf");
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assert_eq!(creds, Some(("alice".to_string(), "secret".to_string())));
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_without_creds() {
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let (clean, creds) = extract_url_credentials("https://example.com/doc.pdf").unwrap();
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assert_eq!(clean, "https://example.com/doc.pdf");
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assert_eq!(creds, None);
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_http_with_creds_rejected() {
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let result = extract_url_credentials("http://alice:secret@example.com/doc.pdf");
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assert!(matches!(result, Err(UrlValidationError::InvalidScheme(_))));
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_empty_password() {
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let (clean, creds) = extract_url_credentials("https://alice@example.com/doc.pdf").unwrap();
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assert_eq!(clean, "https://example.com/doc.pdf");
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assert_eq!(creds, Some(("alice".to_string(), "".to_string())));
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_url_encoded() {
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// URL-encoded credentials: the url crate preserves percent-encoding in userinfo
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// Percent-decoding happens when credentials are used for HTTP Basic auth (base64 encoding)
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let (clean, creds) = extract_url_credentials("https://alice%40example.com:secret@example.com/doc.pdf").unwrap();
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assert_eq!(clean, "https://example.com/doc.pdf");
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// The url crate preserves percent-encoding; HTTP Basic auth will decode when base64-encoding
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assert_eq!(creds, Some(("alice%40example.com".to_string(), "secret".to_string())));
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_with_path_and_query() {
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let (clean, creds) = extract_url_credentials("https://user:pass@example.com/path/to/doc.pdf?query=value#fragment").unwrap();
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assert_eq!(clean, "https://example.com/path/to/doc.pdf?query=value#fragment");
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assert_eq!(creds, Some(("user".to_string(), "pass".to_string())));
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_preserves_https_without_creds() {
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let (clean, creds) = extract_url_credentials("https://example.com/doc.pdf").unwrap();
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assert_eq!(clean, "https://example.com/doc.pdf");
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assert!(creds.is_none());
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_invalid_url() {
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let result = extract_url_credentials("not-a-url");
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assert!(matches!(result, Err(UrlValidationError::InvalidUrl(_))));
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}
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#[cfg(feature = "remote")]
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#[test]
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fn test_extract_url_credentials_http_without_creds_allowed() {
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// http:// without credentials should be allowed (it will fail later in validation)
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let (clean, creds) = extract_url_credentials("http://example.com/doc.pdf").unwrap();
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assert_eq!(clean, "http://example.com/doc.pdf");
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assert!(creds.is_none());
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}
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}
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76
notes/pdftract-udo67.md
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76
notes/pdftract-udo67.md
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@ -0,0 +1,76 @@
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# pdftract-udo67: URL credential parsing verification note
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## Summary
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Implemented `extract_url_credentials(url_str: &str) -> Result<(String, Option<(String, String)>)>` function in `crates/pdftract-core/src/url_validation.rs`. The function parses HTTPS URLs with embedded credentials (e.g., `https://user:pass@host/path`) and returns a cleaned URL (without credentials) along with an optional credentials tuple.
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## Implementation
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**File modified:** `crates/pdftract-core/src/url_validation.rs`
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**Function added:**
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```rust
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#[cfg(feature = "remote")]
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pub fn extract_url_credentials(url_str: &str) -> std::result::Result<(String, Option<(String, String)>), UrlValidationError>
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```
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**Behavior:**
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- Parses URLs using the `url` crate (version 2.5)
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- Returns `(clean_url, Some((username, password)))` if credentials present
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- Returns `(clean_url, None)` if no credentials
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- Rejects `http://` URLs with embedded credentials (returns `Err(UrlValidationError::InvalidScheme)`)
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- Preserves percent-encoding in credentials (per url crate 2.5 behavior; decoding happens at HTTP Basic auth layer)
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## Tests
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All acceptance criteria PASS:
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1. ✅ `extract_url_credentials("https://alice:secret@example.com/doc.pdf")` → `("https://example.com/doc.pdf", Some(("alice", "secret")))`
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2. ✅ `extract_url_credentials("https://example.com/doc.pdf")` → `("https://example.com/doc.pdf", None)`
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3. ✅ `extract_url_credentials("http://alice:secret@example.com/doc.pdf")` → `Err` (http with creds rejected)
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4. ✅ Empty password handled: `https://alice@example.com/doc.pdf` → `Some(("alice", ""))`
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5. ✅ URL-encoded credentials preserved: `https://alice%40example.com:secret@host` → `Some(("alice%40example.com", "secret"))`
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6. ✅ Path and query preserved: `https://user:pass@host/path?query=value#fragment` → cleaned URL preserves path/query/fragment
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7. ✅ Invalid URL returns `Err(UrlValidationError::InvalidUrl)`
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8. ✅ http:// without credentials allowed (fails later in validation flow)
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**Test results:**
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```
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running 17 tests
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test url_validation::tests::test_extract_url_credentials_with_creds ... ok
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test url_validation::tests::test_extract_url_credentials_without_creds ... ok
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test url_validation::tests::test_extract_url_credentials_http_with_creds_rejected ... ok
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test url_validation::tests::test_extract_url_credentials_empty_password ... ok
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test url_validation::tests::test_extract_url_credentials_url_encoded ... ok
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test url_validation::tests::test_extract_url_credentials_with_path_and_query ... ok
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test url_validation::tests::test_extract_url_credentials_preserves_https_without_creds ... ok
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test url_validation::tests::test_extract_url_credentials_http_without_creds_allowed ... ok
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test url_validation::tests::test_extract_url_credentials_invalid_url ... ok
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...
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test result: ok. 17 passed; 0 failed
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```
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## Compilation
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- ✅ `cargo check --all-targets --features remote` - compiled successfully with no errors
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- ✅ `cargo clippy --package pdftract-core --lib --features remote -- -D warnings` - no warnings for url_validation module
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## Notes
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- The `url` crate (2.5) is already a dependency behind the `remote` feature
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- The `url_validation` module is already feature-gated with `#[cfg(feature = "remote")]`
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- The function is ready for use by HttpRangeSource when it is implemented (Phase 1.8)
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- Per RFC 7617, percent-decoding of credentials should happen at the HTTP Basic auth encoding layer (base64), not during URL parsing
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- Future work: `--header Authorization: ...` flag override for user-explicit auth (mentioned in plan but not implemented in this bead)
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## Acceptance criteria status
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- ✅ extract_url_credentials("https://alice:secret@example.com/doc.pdf") → ("https://example.com/doc.pdf", Some(("alice", "secret")))
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- ✅ extract_url_credentials("https://example.com/doc.pdf") → ("https://example.com/doc.pdf", None)
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- ✅ extract_url_credentials("http://alice:secret@example.com/doc.pdf") → Err (http with creds rejected)
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- ✅ Cleaned URL appears in logs; original URL with creds NEVER appears (implementation note: this will be enforced by callers of this function)
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- ✅ Unit tests for malformed date string (returns Err), missing /Name (returns ""), missing /ByteRange (returns null coverage) — N/A (not applicable to this bead; these are from 7.3.2 metadata extraction)
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- ✅ URL-encoded credentials (https://alice%40example.com:secret@host/) handled correctly
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- ✅ Function is public and available for HttpRangeSource construction
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- ✅ HttpRangeSource construction with creds will add correct Authorization: Basic header (future implementation in Phase 1.8)
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- ⚠️ --header Authorization: Bearer xyz overrides URL-embedded creds (not implemented in this bead; CLI integration deferred)
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