PURL Type Definition: chrome-extension

Type Name: Chrome Browser Extensions
Description: Chrome Browser Extensions. Note: there are currently no officially documented APIs, further there appears to be no way to query different versions of a package - there only seems to be responses on the latest version. To this end the version component of a chrome purl can be optional. Two known data sources are a sitemap which can be crawled to discover (some) extensions at https://chromewebstore.google.com/sitemap, and an 'updatecheck' API which you can read about here https://github.com/Rob--W/crxviewer , and perhaps here https://github.com/chromium/chromium/blob/main/docs/updater/protocol_3_1.md
Schema ID: https://packageurl.org/types/chrome-definition.json

PURL Syntax

The structure of a PURL for this package type is:

pkg:chrome-extension/<name>@<version>?<qualifiers>#<subpath>

Use Repository: Yes
Default Repository URL: https://chromewebstore.google.com/
Note: There is no documented API, only a sitemap and 'updatecheck' endpoints.

Requirement: Required
Permitted Characters: ^[a-p]{32}$
Native Label: extension_id
Note: The name is 32 characters in the range a-p (base16-encoded with letters instead of hex digits) and is case insensitive. This is not the same as the display name which is human readable and may vary with locale.

Requirement: Optional
Permitted Characters: ^\d+(\.\d+){0,3}$
Native Label: version
Note: The chrome extension version is semver-like but 1-4 segments. See https://developer.chrome.com/docs/extensions/reference/manifest/version