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Informations about the package format-policy

kraenzle-ritter/format-policy

A format policy registry and preingest for Laravel. Used by Anton (archival description) and agate (SIP preparation), so that both apply the same rules under the same keys.

Before a file is ingested, the preingest identifies it, applies the rules in force for the tenant and the route the file came by, verifies each result and identifies it again. It never fails an ingest: a step that fails, a verification that does not pass, a result that is not smaller — the file as it was before that rule is kept, and the outcome is recorded.

Concepts

Entry What it is
Tool A program, the names it may go by, and how to ask it for its version
Command How a tool is called — identify, characterize, transform or verify — by a template or a handler class
Rule When and what for: phase, format match (MIME, PRONOM, extension), ingest routes, a precheck that may veto it, transforms, a verification, and what becomes of the original

Every entry has a stable key and an English label and description. Keys are never deleted or given a new meaning: events recorded on files name them. Retire a rule and add its successor under a new key with replaces.

The tools, commands and rules live in the package's catalogue (resources/catalogue.php). A program may add entries of its own in config/format-policy.php; one that redefines a catalogue key is reported in problems() and ignored.

Rules in the catalogue

Key Default What it does
tiff_zip off Repacks a TIFF losslessly as Deflate with predictor 2 (tiffcp), copies its metadata back (exiftool) and verifies the pixels page by page (ImageMagick). Skips TIFFs already packed so, JPEG-compressed, bitonal or BigTIFF, and results that are not smaller. Not for SIPs (sip_ech, sip_agate).

Installation

Tools used by the catalogue: sf (Siegfried), tiffcp (libtiff-tools), exiftool, magick (ImageMagick 7). A rule whose tools are missing on the server is not applied, and a warning is logged.

Usage

The route is a string the program defines (Anton: upload, media_add, sip_ech, …); a backed enum is accepted by its value.

Each RuleOutcome is meant to be stored as an event on the ingested file (Anton: a format-normalization medium event). Its details name the rule, the route, the tools with their versions, and MD5, SHA-512, size, PRONOM id and MIME type before and after.

Preingest::plan() names the rules that would act on a file without changing it; PreingestForecast::forFiles() estimates, by extension and MIME type only, how many files of an import a rule may act on.

Switches per tenant

Whether a rule is in force is decided per tenant by a SwitchStore; a rule's enabled_by_default applies where the tenant says nothing. A retired rule is never in force.

Testing

The TIFF fixtures are built by tests/fixtures/make-fixtures.sh.

License

MIT

All versions of format-policy with dependencies

PHP Build Version
Package Version
Requires php Version ^8.2
illuminate/support Version ^12.0|^13.0
illuminate/process Version ^12.0|^13.0
illuminate/filesystem Version ^12.0|^13.0
illuminate/translation Version ^12.0|^13.0
illuminate/view Version ^12.0|^13.0
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