Manifest model files to help create and read manifests

[tladesignz]

Changes in this pull request

This is a minimal implementation of

https://opensource.contentauthenticity.org/docs/manifest/json-ref/manifest-def
https://opensource.contentauthenticity.org/docs/manifest/writing/assertions-actions

and some related references:

https://c2pa.org/specifications/specifications/2.1/specs/C2PA_Specification.html#_uri_references
https://cv.iptc.org/newscodes/imageregiontype/
https://spec.c2pa.org/specifications/specifications/2.2/specs/C2PA_Specification.html#_actions
https://spec.c2pa.org/specifications/specifications/2.2/specs/C2PA_Specification.html#_standard_c2pa_assertion_summary
https://spec.c2pa.org/specifications/specifications/1.0/specs/C2PA_Specification.html#_existing_manifests

This enables rendering and parsing of - at least - a minimal example like

import C2PA

let manifest = ManifestDefinition(
            assertions: [.actions(actions: [Action(action: .created, digitalSourceType: .digitalCapture)])],
            claimGeneratorInfo: [.init(operatingSystem: ClaimGeneratorInfo.operatingSystem)],
            format: mimeType,
            title: String(format: "c2pa-cam_%@.%@", timestamp.iso8601, ext))

print(manifest.description)

let builder = try Builder(manifestJSON: manifest.description)

Will render

{
    "claim_generator_info": [{
        "version": "0.1.0",
        "operating_system": "iOS 26.0.1",
        "name": "c2pa-cam"
    }],
    "claim_version": 1,
    "ingredients": [],
    "title": "c2pa-cam_2025-11-06T17.30.26.688+01.00.heic",
    "assertions": [{
        "data": {
            "actions": [{
                "action": "c2pa.created",
                "digitalSourceType": "http:\/\/cv.iptc.org\/newscodes\/digitalsourcetype\/digitalCapture",
                "softwareAgent": "c2pa-cam"
            }]
        },
        "label": "c2pa.actions"
    }],
    "format": "image\/heic"
}

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• All applicable changes have been documented
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment

[tladesignz]

For context: I'm working with @redaranj for the Guardian Project.

[codecov]

Codecov Report

❌ Patch coverage is 83.03167% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.05%. Comparing base (006a8da) to head (d972922).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
Library/Sources/Manifest/AssertionDefinition.swift	57.30%	38 Missing ⚠️
TestShared/Sources/ManifestTests.swift	73.43%	34 Missing ⚠️
Library/Sources/Manifest/ClaimGeneratorInfo.swift	83.33%	2 Missing ⚠️
Library/Sources/Manifest/ManifestDefinition.swift	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   57.54%   61.05%   +3.51%     
==========================================
  Files          20       48      +28     
  Lines        2744     3184     +440     
==========================================
+ Hits         1579     1944     +365     
- Misses       1165     1240      +75     

Flag	Coverage Δ
unittests	61.05% <83.03%> (+3.51%)	⬆️

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