install: canonical registry URL in Scope; redact secrets in bun audit registry URLs

[robobun]

Problem

• A registry configured as http:host:port/path/ (scheme followed by a single colon, which new URL() and npm accept) fails every resolution before a request is made:

  error: Invalid package name "react": manifest URL "http://host:port/path/react" is not on registry "http:host:port/path/"
  error: InvalidURL
  

• Same failure for the other spellings the WHATWG parser rewrites (probe against a local server on the released 1.4.0, full output in the details below): a .. segment in the path, an unencoded space in the path, backslashes, surrounding whitespace. Three entries of the "Registry URLs" table in bun-install.test.ts (https:example.org, https://////example.com///, http://點看) hit it too; the table did not notice because failed to resolve is also printed after this rejection.
• An upper-case scheme passes the manifest check (it compares case-insensitively) but fails for_tarball's same-origin comparison (src/install/NetworkTask.rs, send_auth), which is case-sensitive, so the tarball is requested without the Authorization header.
• Cause: Scope::from_api (src/install/npm.rs) and the --registry branch of Options::load (src/install/PackageManager/PackageManagerOptions.rs) store the registry href as written. NetworkTask::for_manifest builds the manifest URL with bun_url::join, which runs the href through the WHATWG parser, and then compares the result against URL::parse of the stored string. URL::parse is Bun's lenient scanner: it only recognizes a scheme followed by ://, does not resolve .., percent-encode, strip whitespace or lower-case, so for these spellings the two sides describe different URLs (http:host:port/... parses as hostname http with no protocol). The same stored string feeds for_tarball's origin comparison, extract_tarball::build_url, url_is_under_registry in bun.lock.rs, the DNS prefetch and the @@<hostname> cache folder name.

Fix

• Adds Scope::set_url: stores the WHATWG serialization of the configured URL (bun_url::URL::from_string, the same parser join uses) and derives url_hash from it. Scope::from_api, the --registry branch and the parseManifest test helper (src/install_jsc/npm_jsc.rs) all build the URL through it, so there is one place that decides what a Scope holds.
• Correct because the stored href now equals the base join resolves against, so every consumer that compares with, concatenates onto or hashes the href agrees with the URL actually requested. The on-registry check itself is unchanged and still rejects a name that joins outside the registry directory (tested).
• Credentials cannot reach anything new. The manifest request URL is unchanged (join parsed its base with the WHATWG parser before this change too, so join(as written, name) and join(normalized, name) are the same URL); only the value it is compared against changes. Both checks compare against the stored href, so the only origin a tarball request can now carry credentials to is the normalized registry origin, which is where the manifest request (which always carries them) already went. Before, a non-canonical spelling could only make the comparisons fail. The one request URL that does change is the extract_tarball::build_url fallback (manifest or bun.lock entry without a tarball URL), which concatenates onto the href and now produces a URL on that same origin instead of a string that failed the http(s):// prefix check.
• A string the WHATWG parser rejects is stored as written, so the Failed to join registry "<as written>" diagnostics for the invalid entries of the table are unchanged (the table still asserts them).
• set_url runs after from_api has split the /:_authToken= style credentials off the path, because the WHATWG parser would percent-encode them. This is also why the normalization is not applied earlier, in the config loaders: the .npmrc / bunfig string form extracts userinfo credentials with the lenient parser first (an unencoded # in a password is accepted there today).
• Already-canonical URLs serialize to themselves, so their url_hash, manifest cache files and cache folder names are unchanged; https://registry.npmjs.org/ in particular still hashes to DEFAULT_URL_HASH. The hash changes only for spellings the parser rewrites; of those, only upper-case spellings worked before, and for them the cost is one re-download of the cache.
• Not covered, on purpose: .npmrc credential lines (//host/path/:_authToken=) are matched against the registry URL in src/ini/lib.rs before a Scope exists, still by lenient parse of the string as written, so a registry spelled https:host/path/ gets its requests but not its .npmrc token. That matching is being reworked in install: resolve .npmrc credentials by path-segment ancestor #33869; filed separately. Spellings where the lenient parser takes the port for a :key=value credential suffix (http:/host:port/, http:////host:port/) are still mangled by the credential stripping that runs before set_url; without a port they work.
• Verified: test/cli/install/bun-install.test.ts ("Registry URLs"): new spellings the WHATWG parser rewrites block (bunfig registry object with a token for each spelling, asserting the paths and Authorization header of the manifest and tarball requests plus the cache folder name; .npmrc registry=; --registry; the rejection message for a name that joins outside the registry), and the table's handled entries now also assert the rejection did not happen. 12 tests fail on the released build (9 with the error above, the upper-case one with authorization: null on the tarball, the rejection test because the message quoted the raw spelling), all pass with this change.
• Also run with the change: the rest of bun-install.test.ts (remaining failures are the bitbucket/gitlab/some.url network tests and --registry CLI flag, which fail identically on the released build in this container), npmrc.test.ts, the registry/whoami/manifest-cache tests of bun-install-registry.test.ts, bun-install-pathname-trailing-slash.test.ts, cargo clippy on bun_install and bun_install_jsc, and the source lints.

Background

• npm::registry::Scope is the package manager's record of one registry (the default one or an [install.scopes] entry): its URL, credentials and url_hash. url_hash keys the manifest cache files and tells whether the default registry was overridden, which switches cache folder names from name@version to name@version@@<hostname>.
• Bun has two URL parsers. bun_url::URL::parse is a lenient, allocation-free scanner over the input bytes that the HTTP client and the package manager use to read components out of a URL they already hold. bun_url::join / URL::from_string call WTF::URL, the WHATWG parser behind new URL(), which normalizes (scheme and host case, missing slashes, ./.. segments, percent-encoding, IDN) and rejects what it cannot parse. The lenient scanner gives correct answers on WHATWG output; the bug was feeding it the user's input instead.
• The "is not on registry" check exists so that a dependency name that joins to another origin (an alias like npm:\\other-host\pkg) cannot make Bun send the scope's credentials there; the tarball check in for_tarball does the same for dist.tarball URLs returned by the registry. Both are same-origin comparisons of a request URL against the stored registry URL.

Probe: registry spellings against a local server (released 1.4.0 vs this branch)

Each row configures the spelling in bunfig.toml with one dependency and records what reaches the server.

registry as written	1.4.0	this branch
http://localhost:PORT/some/path/	GET /some/path/react	same
http:localhost:PORT/some/path/	no request, is not on registry	GET /some/path/react
http:\\localhost:PORT\some\path\	no request, is not on registry	GET /some/path/react
http://localhost:PORT/some/x/../path/	no request, is not on registry	GET /some/path/react
http://localhost:PORT/some path/	no request, is not on registry	GET /some%20path/react
http://localhost:PORT/some/path/ (leading space)	no request, is not on registry	GET /some/path/react
HTTP://LOCALHOST:PORT/some/path/	GET /some/path/react (tarball would be sent without Authorization)	same request, tarball authorized (covered by the test)
http:/localhost:PORT/some/path/	stored as http://http/localhost/ by the credential-suffix stripping	unchanged (see Fix)
http:////localhost:PORT/some/path/	stored as http://localhost/localhost/ by the credential-suffix stripping	unchanged (see Fix)

---

Also folded in: audit — redact secrets in the registry URLs printed by bun audit / bun audit fix (from #38844)

Problem

• With a registry URL that carries a secret, bun audit and bun audit fix print it. With npm_config_registry=http://alice:s3cret@127.0.0.1:PORT/ and a registry answering 404, stderr is error: POST http://alice:s3cret@127.0.0.1:PORT/-/npm/v1/security/advisories/bulk - 404. A token in the registry path (http://host/npm_.../) is printed the same way, and reaches these lines from every config source, including .npmrc.
• Four outputs format the registry href verbatim (BStr::new), where the rest of the package manager formats such URLs with bun_core::fmt::redacted_npm_url (Npm::response_error in src/install/npm.rs, the verbose request trace in src/http/lib.rs, bun pm whoami):
  • src/runtime/cli/audit_command.rs send_audit_request: the POST <url> - <status or error> line (the repro above).
  • src/runtime/cli/audit_command.rs report_non_json_response: <registry> returned a non-JSON audit response, reached from the report, --json and audit fix paths.
  • src/install/audit_fix.rs print_unaudited: warn: <registry> did not answer the audit request (<reason>); skipped <packages>, printed by both commands for a scoped registry that failed.
  • src/install/audit_fix/json.rs: the registry field of each unaudited entry in bun audit fix --json.
• The href is scope.url.href() as configured (AuditRegistry::from_scope; unaudited() copies it into the UnauditedRegistry record behind the last two outputs). .npmrc and bunfig registry strings move user:password@ out of it while loading, the bunfig object form, the registry env vars and --registry keep it (install: send credentials embedded in --registry and registry env var URLs #38796 and install: send credentials embedded in a registry URL that comes from an env var #38834 change the latter two), and a token in the path stays in it in every case.
• The 1.3.x binaries print audit request failed (status N) without a URL; the URL in these lines came with the audit rewrite in install: pnpm parity — dedupe, prune, pm licenses, audit fix, add --filter/--catalog, nested overrides, transitive update, and workspace fixes #38333, so this has not shipped in a release.

Fix

• The POST line and report_non_json_response format the URL with redacted_npm_url: these quote the request URL, so they get the same masked form as the manifest and tarball error lines (http://alice:******@host/..., path token as ***). AuditRegistry.href itself stays raw because it is also what the request is sent to.
• The skipped-registry record names a registry rather than quoting a request, so unaudited() builds it from href_without_auth() (trailing slash stripped), the same form bun publish prints as its registry: credentials written into the URL are left out instead of masked, and the record reads the same whichever config source the scope came from (http://host:PORT, matching what .npmrc scopes already produced). Its two emitters, the warning and the --json field, format it with redacted_npm_url for tokens in the path (http://host:PORT/***); the --json value is rendered into a buffer first because the JSON string writer takes bytes. The unaudited array is new in install: pnpm parity — dedupe, prune, pm licenses, audit fix, add --filter/--catalog, nested overrides, transitive update, and workspace fixes #38333, so nothing depends on the raw form.
• For a URL without a password, UUID or npm_ token the output is byte for byte unchanged; the 177 existing tests in bun-audit.test.ts, many of which assert these exact lines with plain URLs, still pass.
• Not touched, same class elsewhere: bun audit fix's was not checked for updates lines repeat the install log's GET <url> - <status> text, which install: redact secrets in the URLs printed for failed manifest and tarball downloads #38817 redacts at its source; the registry URL lines in src/install/NetworkTask.rs (Failed to join registry ..., ... is not on registry ...) and src/install/pnpm.rs (fetching pnpm registry ... from <url>) are install-side and have been filed separately. This PR and install: redact secrets in the URLs printed for failed manifest and tarball downloads #38817 touch disjoint files.
• Tests: test/cli/install/bun-audit.test.ts, new bun audit with a secret in the registry URL block, one test per output: the POST line, the non-JSON line from the response check, the non-JSON line from the parse step in report, --json and fix mode, the skipped-registry warning and unaudited[].registry with a token in the registry path (.npmrc scope), and the same two outputs with user:password@ in the URL (bunfig object-form scope, which keeps it), asserting the credential-free form. The path-token cases use a token rather than a password because a token reaches the audit command from every config source; the credential case asserts the stripped form, which stays true once install: send credentials embedded in --registry and registry env var URLs #38796 / install: send credentials embedded in a registry URL that comes from an env var #38834 strip credentials earlier, so this PR does not depend on their landing order. All five fail on this branch with src/ stashed (the token or password is printed); the credential case also fails with only the unaudited() hunk removed (it then prints alice:******@), and the --json case with only the json.rs hunk removed; all 182 tests in the file pass with the change.
• Also ran cargo clippy -p bun_install -p bun_runtime, cargo fmt --check on both crates, and test/internal/source-lints.

Background

• bun audit POSTs the lockfile's package versions to <registry>/-/npm/v1/security/advisories/bulk. Packages whose scope (@foo/*) is configured with its own registry are sent to that registry instead; when a non-default registry fails to answer (HTTP error, connection error, non-JSON body) its packages are reported as skipped (one UnauditedRegistry record per registry, printed as the warning and, by audit fix --json, as the unaudited entries) rather than failing the command, while a failure from the default registry fails the command with the POST or non-JSON line.
• redacted_npm_url (src/bun_core/fmt.rs) is a Display adapter over URL bytes: the password of scheme://user:password@host is written as one * per byte (the per-byte form is shared with the config-excerpt redactor, which needs column alignment), and any UUID or npm_/npms_ token anywhere in the string as ***; everything else is written through unchanged. Output::err_generic, warn! and pretty_errorln! take any Display argument, so it is a drop-in replacement for BStr::new (err_generic's {s}/{f} placeholder letters are cosmetic; {f} is what the other redacted_npm_url call site uses).
• URL::href_without_auth() (src/url/lib.rs) rebuilds scheme://host[:port]/path/ from the parsed URL, dropping any userinfo; it is what the config loaders use to store a registry URL whose credentials were split out, and what bun publish prints as Registry:. It currently yields http://host// for a root-path registry (url: emit a single slash in href_without_auth() for root-path registry URLs #38812 changes that to one slash); unaudited() strips trailing slashes afterwards, so the record is http://host:PORT either way. Tokens that are part of the path survive it, which is why the record's emitters still go through redacted_npm_url.

Before / after on a debug build (404 registry, non-JSON registry, scoped registry with a path token, scoped registry configured as { url = "http://alice:s3cret@..." })

Before:

error: POST http://alice:s3cret@127.0.0.1:PORT/npm_a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8/-/npm/v1/security/advisories/bulk - 404
error: http://alice:s3cret@127.0.0.1:PORT/npm_a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8 returned a non-JSON audit response
warn: http://127.0.0.1:PORT/npm_a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8 did not answer the audit request (404); skipped @foo/bar
{"dryRun":false,...,"unaudited":[{"registry":"http://127.0.0.1:PORT/npm_a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8","packages":["@foo/bar"],"reason":"404"}],...}
warn: http://alice:s3cret@localhost:PORT did not answer the audit request (404); skipped @foo/bar
{"dryRun":false,...,"unaudited":[{"registry":"http://alice:s3cret@localhost:PORT","packages":["@foo/bar"],"reason":"404"}],...}

After:

error: POST http://alice:******@127.0.0.1:PORT/***/-/npm/v1/security/advisories/bulk - 404
error: http://alice:******@127.0.0.1:PORT/*** returned a non-JSON audit response
warn: http://127.0.0.1:PORT/*** did not answer the audit request (404); skipped @foo/bar
{"dryRun":false,...,"unaudited":[{"registry":"http://127.0.0.1:PORT/***","packages":["@foo/bar"],"reason":"404"}],...}
warn: http://localhost:PORT did not answer the audit request (404); skipped @foo/bar
{"dryRun":false,...,"unaudited":[{"registry":"http://localhost:PORT","packages":["@foo/bar"],"reason":"404"}],...}

Earlier revision of this PR

The first revision applied redacted_npm_url to the UnauditedRegistry record as well, so for the config sources that keep credentials in the URL the warning and the --json field came out as http://alice:******@host (username and password length, and a different shape from the .npmrc case, which had no userinfo to begin with). Review pointed out that every other place bun emits a registry URL as data drops the credentials instead; the record is now built with href_without_auth() and the per-byte masking is confined to the two lines that quote the request URL.

Closes #38844

---

no test proof · iteration 0 · Platform-specific test(s) that do not run on this machine. Deferring to CI, which covers all platforms: test/cli/install/bun-install.test.ts

[coderabbitai]

Walkthrough

Changes

The PR centralizes npm registry URL normalization through Scope::set_url. Audit errors, warnings, and JSON records now redact registry credentials and token-like path secrets. Tests cover canonicalization, authentication, traversal rejection, and audit output.

Registry URL handling

Layer / File(s)	Summary
Centralize registry URL normalization src/install/npm.rs, src/install/PackageManager/PackageManagerOptions.rs, src/install_jsc/npm_jsc.rs, test/cli/install/bun-install.test.ts	Scope::set_url normalizes registry URLs, preserves rejected hrefs, and recalculates url_hash. Installation paths and tests use the shared setter and validate canonical request paths, authorization, caching, and registry-directory boundaries.
Redact registry values in audit output src/install/audit_fix.rs, src/install/audit_fix/json.rs, src/runtime/cli/audit_command.rs, test/cli/install/bun-audit.test.ts	Audit text and JSON output use credential-free or redacted registry URLs. Tests cover POST failures, response errors, parse failures, skipped registries, URL credentials, and token-like path secrets.

Possibly related PRs

• oven-sh/bun#37669: Directly overlaps registry URL normalization, redaction, and related audit/install tests.
• oven-sh/bun#38322: Shares centralized registry handling in PackageManagerOptions.
• oven-sh/bun#38844: Directly overlaps audit URL redaction in the same code paths and tests.

Suggested reviewers: jarred-sumner

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the two primary changes: canonical registry URLs and secret redaction in audit output.
Description check	✅ Passed	The description thoroughly explains the problems, fixes, verification steps, scope, and test coverage, despite using different section headings than the template.

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[robobun]

Status: reproduced and fixed, self-review in progress.

• Reproduced on the released 1.4.0 with a local Bun.serve registry: registry = "http:127.0.0.1:<port>/npm/" in bunfig.toml makes bun install print manifest URL "http://127.0.0.1:<port>/npm/react" is not on registry "http:127.0.0.1:<port>/npm/" and send nothing; the same happens for a .. segment, an unencoded space, backslashes and leading whitespace, and an upper-case scheme drops the Authorization header from the tarball request (probe table in the PR description).
• Fix: Scope::set_url in src/install/npm.rs, used by Scope::from_api, --registry and the manifest test helper.
• Tests: test/cli/install/bun-install.test.ts, describe "Registry URLs": 12 tests fail on the released build and pass with this branch.

[claude]

I reviewed this PR and didn't find any bugs. Because it changes how the registry URL is stored and thereby affects the same-origin checks that decide whether Authorization headers are sent on manifest and tarball requests, a human look at the credential-forwarding behavior would still be worthwhile.

What was reviewed:

• set_url normalization vs. bun_url::join — both go through the WHATWG parser, so the stored href now matches the request base; the parser-rejects fallback keeps the "Failed to join registry" diagnostic intact.
• url_hash / did_override_default_scope — https://registry.npmjs.org/ serializes to itself, so DEFAULT_URL_HASH still matches and cache keys for canonical URLs are unchanged.
• The "is not on registry" guard — unchanged and still exercised by the new ".." dependency test; the upper-case-scheme case now sends auth on the tarball, which is same-origin with the user-configured registry.
• Tests are hermetic (local Bun.serve, tempDir, concurrent pipe drains) and all referenced imports already exist in the file.

Extended reasoning...

Overview

This PR adds Scope::set_url in src/install/npm.rs, which stores the registry URL as its WHATWG-parser serialization (via bun_url::URL::from_string) rather than the string as written, and recomputes url_hash from that form. Three call sites are routed through it: Scope::from_api (bunfig / .npmrc registries), the --registry CLI branch in PackageManagerOptions.rs, and the test-only parseManifest helper in npm_jsc.rs. The test file gains ~120 lines exercising URL spellings the WHATWG parser rewrites (single-colon scheme, backslashes, .. segments, whitespace, unencoded space, upper-case scheme) across bunfig, .npmrc, and --registry, plus a negative test that a dependency name escaping the registry directory is still rejected.

Security risks

The stored registry URL feeds two same-origin checks that gate credential forwarding: the manifest "is not on registry" check in NetworkTask::for_manifest and the tarball send_auth check in NetworkTask::for_tarball. Normalizing the stored form to match the form requests are actually built from (via bun_url::join) removes false negatives — notably, an upper-case scheme previously passed the manifest check but failed the case-sensitive tarball check, so the tarball was fetched without Authorization. After this change the tarball carries the token. That is a correct fix (same origin, user-configured token), but it is a behavior change in a credential-forwarding path. The guard against a dependency name that joins outside the registry directory is preserved and covered by a new test. I did not find a way for normalization to widen where credentials are sent — the registry URL is user-configured, and normalization only aligns the stored form with the form already used to build the request.

Level of scrutiny

Medium-high. The Rust change is ~20 lines and consolidates three copies of the same href/hash computation into one helper, which is a structural improvement. But the downstream effect touches auth-header decisions in the package manager, which the repo's review guidance calls out as fail-closed / every-path territory.

Other factors

• DEFAULT_URL_HASH invariance: https://registry.npmjs.org/ is already canonical, so from_string returns it unchanged and without_trailing_slash produces the same input to Scope::hash as before; did_override_default_scope and manifest-cache keys are unaffected for canonical URLs.
• The fallback on parser rejection stores the raw href via OwnedURL::from_href, so the existing "Failed to join registry" table entries in the test suite are unchanged.
• Tests follow harness conventions (local Bun.serve({ port: 0 }), tempDir, await using, concurrent stdout/stderr/exited reads, per-request path + Authorization assertions, cache-folder-name check). All symbols used (env, file, spawn, exists, readdirSorted, tempDir, Bun.TOML.stringify) are already imported/used in the file.
• No prior human reviews or outstanding comments; CodeRabbit was rate-limited and did not review.

[robobun]

On the credential-forwarding question, the argument for why this cannot widen where credentials go:

• The manifest request URL is unchanged by this PR. bun_url::join parses its base with the WHATWG parser either way, so join(as written, name) and join(normalized, name) are the same URL; only the value the result is compared against changes, and it is now exactly the base the join resolved from.
• Both checks (for_manifest's directory check and for_tarball's send_auth) compare against the stored href, so after this change the only origin a tarball request can carry credentials to is the normalized registry origin, which is the origin the manifest request (which always carries them) was already sent to. Before, a non-canonical spelling could only make the comparisons fail, never pass for a different origin, and that is still the case.
• The one branch whose request URL does change is extract_tarball::build_url (used when a manifest or bun.lock entry has no tarball URL): it concatenates onto the stored href, so it now produces a URL on the normalized registry origin instead of a string that failed the http(s):// prefix check.

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@test/cli/install/bun-install.test.ts`:
- Around line 9367-9383: Update the registry URL matrix test using the
established concurrent matrix pattern so each independent case runs concurrently
rather than serially. Preserve the existing cases, install assertions, and cache
validation in the test around the it.each registry matrix.

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📥 Commits

Reviewing files that changed from the base of the PR and between 95cb693 and a1168d7.

📒 Files selected for processing (8)

• src/install/PackageManager/PackageManagerOptions.rs
• src/install/audit_fix.rs
• src/install/audit_fix/json.rs
• src/install/npm.rs
• src/install_jsc/npm_jsc.rs
• src/runtime/cli/audit_command.rs
• test/cli/install/bun-audit.test.ts
• test/cli/install/bun-install.test.ts

[claude]

I reviewed this PR and the automated bug hunt found no issues. Because it changes how registry URLs are stored and compared — which feeds the same-origin checks that gate Authorization on tarball requests — a human look at the credential-forwarding argument would still be worthwhile. There are also two open comment-cop notes on the doc comments in npm.rs and npm_jsc.rs.

What was reviewed:

• Scope::set_url stores the WHATWG serialization (URL::from_string) and re-derives url_hash; verified all three call sites (from_api, the --registry branch, js_parse_manifest) run it after credential-suffix stripping, and that the fallback keeps the raw href on parse failure so the existing "Failed to join" diagnostics stay.
• bun audit redaction: the four output sites now go through redacted_npm_url, and unaudited() builds the record from href_without_auth() so URL credentials are dropped rather than masked; checked that AuditRegistry.href (the request URL) stays raw.
• New tests spin up local Bun.serve registries on port 0, assert exact request paths / Authorization headers per spelling, and cover the negative case (name that joins outside the registry still rejected).

Extended reasoning...

Overview

Two related changes: (1) Scope::set_url in src/install/npm.rs normalizes the configured registry URL through the WHATWG parser before storing it, so every consumer of scope.url (the on-registry check, for_tarball's same-origin send_auth gate, extract_tarball::build_url, the @@<hostname> cache folder, url_hash) agrees with the URL bun_url::join actually requests. Called from Scope::from_api, the --registry CLI branch, and the parseManifest test helper. (2) bun audit / bun audit fix now format registry URLs through bun_core::fmt::redacted_npm_url in the POST-error line, the non-JSON line, the skipped-registry warning, and the unaudited[].registry JSON field; the UnauditedRegistry record is built from href_without_auth() so URL userinfo is dropped rather than masked.

Security risks

The first change directly affects where credentials go: for_tarball's same-origin comparison and the on-registry directory check both compare against the stored href. The PR argues that because bun_url::join already parsed its base with the WHATWG parser, the manifest request URL is unchanged and only the comparison target changes — so a non-canonical spelling can now pass the check for the same origin the manifest was already sent to, but cannot pass for any other origin. The upper-case-scheme case (previously withheld the tarball Authorization header) now sends it, which is a behavior change on a credential path. The negative test ("still refuses a name that joins to a URL outside the registry directory") confirms the guard still fires. This reasoning looks sound to me but is exactly the kind of argument a maintainer should sign off on.

The second change is defensive (redacts secrets in error output) and only narrows what is printed.

Level of scrutiny

High. Registry credential forwarding is a security boundary; the change is small but the invariant it touches ("credentials only go to the configured registry origin") is load-bearing. The PR also folds two concerns together (canonicalization from this branch, redaction from #38844), which is fine but adds review surface.

Other factors

• Two comment-cop github-actions comments from today flag the doc comments on set_url (npm.rs:336) and in npm_jsc.rs:124 as paragraph-length; these haven't been addressed. They read to me as legitimate function documentation rather than workaround justification, but they are outstanding.
• Test coverage is thorough: the new bun-install.test.ts block asserts the exact request path and Authorization header for each rewritten spelling plus the cache folder name, and the bun-audit.test.ts block covers every redaction output (POST line, non-JSON in three modes, skipped-registry warning, --json unaudited field) with both a path-token and a URL-userinfo secret.
• did_override_default_scope is computed at the end of Options::load from url_hash, which set_url now derives from the normalized href; https://registry.npmjs.org/ is already canonical so DEFAULT_URL_HASH is unchanged.

[claude]

I reviewed this PR and didn't find any bugs. Because Scope::set_url changes the stored registry href that feeds the same-origin checks gating Authorization on manifest and tarball requests, a human look at the credential-forwarding argument would still be worthwhile.

What was reviewed:

• set_url normalization: falls back to the raw href on WHATWG-parse failure, so the existing "Failed to join registry" diagnostics for invalid URLs are preserved; url_hash is derived from the stored (post-normalization) href, so canonical URLs hash the same as before.
• unaudited(): href_without_auth() + without_trailing_slash drops URL userinfo before it reaches the warning and --json output; path tokens still go through redacted_npm_url at the two emitters.
• The comment-cop and CodeRabbit concurrency comments look addressed by the head commit (set_url's doc is one line; the spelling matrix sits inside describe.concurrent).

Extended reasoning...

Overview

Two changes folded together: (1) Scope::set_url in src/install/npm.rs stores the WHATWG serialization of the configured registry URL and derives url_hash from it; Scope::from_api, the --registry branch of Options::load, and the parseManifest test helper all route through it. (2) Four bun audit output sites (send_audit_request's POST line, report_non_json_response, print_unaudited, and the unaudited[].registry JSON field) now format the registry URL through redacted_npm_url, and unaudited() builds its record from href_without_auth() so URL credentials are dropped rather than masked. Tests cover each spelling variant (single colon, backslashes, dot segment, whitespace, unencoded space, upper-case scheme) and each redacted output line.

Security risks

The stored Scope.url.href() is the value for_tarball's send_auth compares against to decide whether a tarball URL gets the scope's Authorization header, and the value for_manifest compares the joined manifest URL against. The PR's argument (the manifest request URL is unchanged because bun_url::join already parsed its base with the WHATWG parser; both checks now compare against the same normalized origin the manifest was already sent to; a non-canonical spelling could previously only make the checks fail, never pass for a different origin) is coherent and I did not find a case it misses, but this is a same-origin gate on credential forwarding and warrants a second pair of eyes. The redaction half only narrows what is printed and cannot widen exposure.

Level of scrutiny

High. send_auth and the on-registry check are exactly the class of security check REVIEW.md calls out ("Never carry credentials across an https→http downgrade", "security checks fail closed and cover every path"). The change is small and the argument is careful, but it alters the input to those checks across every consumer (manifest, tarball, extract_tarball::build_url, url_is_under_registry, cache folder naming, did_override_default_scope). The audit-redaction half is lower risk (output-only, matches existing redacted_npm_url call sites in Npm::response_error and bun pm whoami).

Other factors

Tests are thorough: each spelling asserts both request paths and both Authorization headers plus the cache folder name; a negative test confirms a .. name still triggers the on-registry rejection with the normalized URL in the message; each redacted output line has its own test that fails on the unfixed build. The two bot comments on this PR (comment-cop on long comments in npm.rs/npm_jsc.rs, CodeRabbit on running the spelling matrix concurrently) appear addressed by the head commit dd432a1c — the set_url doc comment is one line, npm_jsc.rs deletes the paragraph it was flagged for, and the new describe is .concurrent.