feat: adds load_settings and load_settings_file functions

Includes a sample loading a trust list.
contentauth · Dec 3, 2024 · 91d2334 · 91d2334
1 parent a53d19e
commit 91d2334
Showing 7 changed files with 293 additions and 7 deletions.
diff --git a/build.rs b/build.rs
@@ -1,3 +1,4 @@
+// Purpose: Generate the scaffolding for the uniffi library.
 fn main() {
-    uniffi::generate_scaffolding("./src/c2pa.udl").unwrap();
+    let _result = uniffi::generate_scaffolding("./src/c2pa.udl");
 }
diff --git a/c2pa/__init__.py b/c2pa/__init__.py
@@ -11,8 +11,35 @@
 # specific language governing permissions and limitations under
 # each license.
 
-from .c2pa_api import Reader, Builder, create_signer, create_remote_signer, sign_ps256
-from .c2pa import Error, SigningAlg, CallbackSigner, sdk_version, version
-from .c2pa.c2pa import _UniffiConverterTypeSigningAlg, _UniffiConverterTypeReader, _UniffiRustBuffer
+from .c2pa_api import (
+    Reader,
+    Builder,
+    create_signer,
+    create_remote_signer,
+    sign_ps256,
+    load_settings_file,
+)
+from .c2pa import Error, SigningAlg, CallbackSigner, sdk_version, version, load_settings
+from .c2pa.c2pa import (
+    _UniffiConverterTypeSigningAlg,
+    _UniffiConverterTypeReader,
+    _UniffiRustBuffer,
+)
 
-__all__ = ['Reader', 'Builder', 'CallbackSigner', 'create_signer', 'sign_ps256', 'Error', 'SigningAlg', 'sdk_version', 'version', 'create_remote_signer', '_UniffiConverterTypeSigningAlg', '_UniffiRustBuffer', '_UniffiConverterTypeReader']
+__all__ = [
+    "Reader",
+    "Builder",
+    "CallbackSigner",
+    "create_signer",
+    "sign_ps256",
+    "Error",
+    "SigningAlg",
+    "sdk_version",
+    "version",
+    "load_settings",
+    "load_settings_file",
+    "create_remote_signer",
+    "_UniffiConverterTypeSigningAlg",
+    "_UniffiRustBuffer",
+    "_UniffiConverterTypeReader",
+]
diff --git a/c2pa/c2pa_api/c2pa_api.py b/c2pa/c2pa_api/c2pa_api.py
@@ -255,3 +255,11 @@ def sign_ps256(data: bytes, key: bytes) -> bytes:
         hashes.SHA256()
     )
     return signature
+
+def load_settings_file(path: str, format=None):
+    with open(path, "r") as file:
+        if format is None:
+            # determine the format from the file extension
+            format = os.path.splitext(path)[1][1:]
+        settings = file.read()
+    api.load_settings(settings, format)
diff --git a/src/c2pa.udl b/src/c2pa.udl
@@ -2,6 +2,8 @@
 namespace c2pa {
   string version();
   string sdk_version();
+  [Throws=Error]
+  void load_settings([ByRef] string format, [ByRef] string settings);
 };
 
 [Error]

diff --git a/src/lib.rs b/src/lib.rs
@@ -14,7 +14,7 @@
 use std::env;
 use std::sync::RwLock;
 
-pub use c2pa::{Signer, SigningAlg};
+pub use c2pa::{Signer, SigningAlg, settings::load_settings_from_str};
 
 /// these all need to be public so that the uniffi macro can see them
 mod error;
@@ -45,6 +45,11 @@ pub fn sdk_version() -> String {
     )
 }
 
+pub fn load_settings(settings: &str, format: &str) -> Result<()> {
+    load_settings_from_str(settings, format)?;
+    Ok(())
+}
+
 pub struct Reader {
     reader: RwLock<c2pa::Reader>,
 }
@@ -102,6 +107,14 @@ impl Reader {
         }
     }
 
+    // pub fn validation_state(&self) -> Result<ValidationState> {
+    //     if let Ok(st) = self.reader.validation_state() {
+    //         Ok(st.validation_state())
+    //     } else {
+    //         Err(Error::RwLock)
+    //     }
+    // }   
+
     pub fn resource_to_stream(&self, uri: &str, stream: &dyn Stream) -> Result<u64> {
         if let Ok(reader) = self.reader.try_read() {
             let mut stream = StreamAdapter::from(stream);

diff --git a/tests/fixtures/settings.toml b/tests/fixtures/settings.toml
@@ -0,0 +1,229 @@
+# This sample c2pa settings file enables a trust list. 
+# In practice you should update the trust anchors from a remote source as needed.
+# Many other settings are available, see the c2pa documentation for more information.
+[verify]
+trusted = true
+
+[trust]
+trust_config = """
+//id-kp-emailProtection 
+1.3.6.1.5.5.7.3.4
+//id-kp-documentSigning 
+1.3.6.1.5.5.7.3.36
+//id-kp-timeStamping 
+1.3.6.1.5.5.7.3.8
+//id-kp-OCSPSigning 
+1.3.6.1.5.5.7.3.9
+// MS C2PA Signing
+1.3.6.1.4.1.311.76.59.1.9
+"""
+trust_anchors = """
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+"""
diff --git a/tests/test_unit_tests.py b/tests/test_unit_tests.py
@@ -17,7 +17,7 @@
 import unittest
 from unittest.mock import mock_open, patch
 
-from c2pa import  Builder, Error,  Reader, SigningAlg, create_signer,  sdk_version, sign_ps256
+from c2pa import  Builder, Error,  Reader, SigningAlg, create_signer,  sdk_version, sign_ps256, load_settings_file
 
 PROJECT_PATH = os.getcwd()
 
@@ -51,6 +51,12 @@ def test_reader_bad_format(self):
             with open(testPath, "rb") as file:
                 reader = Reader("badFormat", file)
 
+    def test_settings_trust(self):
+        load_settings_file("tests/fixtures/settings.toml")
+        with open(testPath, "rb") as file:
+            reader = Reader("image/jpeg",file)
+            json = reader.json()
+            self.assertIn("C.jpg", json)
 
 class TestBuilder(unittest.TestCase):
     # Define a manifest as a dictionary