sdk headers init - #160
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Three changes to the client-identification headers: The version was a hand-maintained `public static $SDK_VERSION = '7.0.0'`. That has to be bumped by hand on every release and will silently go stale — at which point the telemetry these headers exist to provide is actively wrong, which is worse than absent. It now reads Composer's runtime metadata, falling back to a constant only when that is unavailable (source checkout, no installed package). The property was also public and mutable; the replacement is a method plus a const. The new User-Agent dropped the OS field that the old format carried. Anything parsing that string for platform breakdown would have gone blank without warning, so OS is back: `Postmark-SDK/<v> (PHP/<ver>; OS/<os>)`. Also drops this branch's composer.json and CI edits. They overlap with the ones in #164, which sets a wider range (adding 8.5 as well as dropping 8.1) and so supersedes them — leaving both would just conflict. The PHP-version decision belongs to that PR; this one is only about the headers. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Restoring it to the merge-base copy: the previous commit reverted it to current main, which pulled in main's own newer edits and made them read as this PR's.
getPrettyVersion() throws OutOfBoundsException when the package is absent from Composer's installed map -- a vendored copy, a Phar, a php-scoper'd build, or any future Packagist rename. class_exists() does not guard that: in a Composer-managed host project the class exists and simply does not know about us. Since sdkVersion() runs on every request, that fatalled every API call, and OutOfBoundsException is not a PostmarkException so the documented catch would not have caught it. Guard with isInstalled(), keep a catch as belt-and-braces, and memoize so the lookup happens once rather than twice per request. Normalize the result to a valid RFC 9110 product-version token. Tags are v-prefixed so getPrettyVersion() yields "v7.0.0" while the fallback is "7.0.0" -- the header format differed by install shape -- and a branch install yields "dev-feature/x", where "/" is a delimiter rather than a token character. Declare composer-runtime-api, which the lookup actually depends on. Leaving it out did not fatal, thanks to the class_exists() guard; it silently pinned every report to the fallback, which defeats the point. Keep the User-Agent product token as Postmark-PHP rather than Postmark-SDK, so existing server-side reporting keyed on it does not break silently. The version assertion compared the header against sdkVersion() -- the production code agreeing with itself. Mutation-verified: returning '0.0.0-WRONG' passed before and fails now. It derives the expected value from Composer directly, and SdkVersionTest covers token validity, memoization, normalization, and the fallback-vs-CHANGELOG invariant, all without credentials. Also in the test suite, which this branch had already churned: - Recipients moved to blackhole.postmarkapp.com. The addresses were real-domain and nonexistent, so each CI run hard-bounced against Postmark's own domain. - Restored the multi-recipient fixtures in the string-or-array tests, which built them and then sent to a single address, removing the only coverage of the thing that file exists to test. - Restored the outbound paging assertion from >= 1 back to 10. - Deleted a sender-signature cleanup loop that compared against a fresh uniqid() -- it could never match, and issued one API call per signature in the account to guard a live delete behind that comparison. - str_ireplace for the [TOKEN] placeholder: testing_keys.json.example documents it lowercase, so a fresh setup hit the new hard fail(). - Removed a dead getVerifiedSenderSignature() (no callers, undefined $tk in its catch) and dead $testDataCreated properties. - Removed returns after markTestSkipped(), which is @return never. PHPStan is clean and CHANGELOG records the header change for v7.1.0 -- additive public API, so a minor.
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