This is a simple walkthrough of the C2PA Rust SDK from contentauth/c2pa-rs. It demonstrates the creation of a new media manifest, the addition of new assertions, the import of earlier manifests as ingredients, and the testing of ManifestStore validation statuses during the loading of media.
This code is discussed in this blog post.
~>> ./target/release/c2pa-walkthrough --help
learning the c2pa-rs SDK
Usage: c2pa-walkthrough [OPTIONS]
Options:
--add <VALUE> adds a c2pa manifest to a media file, displays the contents afterwards
--read <VALUE> prints the c2pa manifest contents of a media file; fails if no manifest is present
-h, --help Print help
-V, --version Print version
~>> ./target/release/c2pa-walkthrough --add ./test_file.jpg
manifest store: {
"active_manifest": "urn:uuid:aabda386-2835-455e-9773-a750ff8fc7a4",
"manifests": {
"urn:uuid:aabda386-2835-455e-9773-a750ff8fc7a4": {
"claim_generator": "mikes-c2pa-test-code/0.1 c2pa-rs/0.25.2",
"title": "test_file_c2pa.jpg",
"format": "image/jpeg",
"instance_id": "xmp:iid:2341e08c-4482-42a3-9eea-558696ba94e2",
[ ... ] // Many other details
"assertions": [
{
"label": "c2pa.actions",
"data": {
"actions": [
{
"action": "c2pa.opened",
"parameters": {
"identifier": "xmp:iid:4af197dd-7b85-4cbe-ab93-c2d124a90b4c"
},
"reason": "editing",
"softwareAgent": "mikes-c2pa-test-code/0.1",
"when": "2023-08-24T03:20:16.857741+00:00"
},
{
"action": "c2pa.cropped",
"digitalSourceType": "https://cv.iptc.org/newscodes/digitalsourcetype/minorHumanEdits",
"parameters": {
"identifier": "xmp:iid:4af197dd-7b85-4cbe-ab93-c2d124a90b4c"
},
"softwareAgent": "mikes-c2pa-test-code/0.1",
"when": "2023-08-24T03:20:16.857741+00:00"
}
]
}
}
],
"signature_info": {
"issuer": "C2PA Test Signing Cert",
"cert_serial_number": "720724073027128164015125666832722375746636448153"
},
"label": "urn:uuid:af72af31-6201-44c2-b506-8875ed22c788"
}