feat(shorebird_code_push_protocol): generate models + messages from OpenAPI spec (#3696)

packages/shorebird_code_push_client/lib/src/code_push_client.dart

@@ -190,15 +190,22 @@ class CodePushClient {
     );
     final file = await http.MultipartFile.fromPath('file', artifactPath);
 
-    final payload = CreateReleaseArtifactRequest(
-      arch: arch,
-      platform: platform,
-      hash: hash,
-      size: file.length,
-      canSideload: canSideload,
-      filename: p.basename(artifactPath),
-      podfileLockHash: podfileLockHash,
-    ).toJson().map((key, value) => MapEntry(key, '$value'));
+    // `toJson` returns proper JSON types; multipart fields are always
+    // strings on the wire. Drop null-valued keys so absent-optional
+    // fields don't send the literal string "null" (previously handled
+    // by `@JsonKey(includeIfNull: false)` in the handwritten model).
+    final payload = <String, String>{
+      for (final entry in CreateReleaseArtifactRequest(
+        arch: arch,
+        platform: platform,
+        hash: hash,
+        size: file.length,
+        canSideload: canSideload,
+        filename: p.basename(artifactPath),
+        podfileLockHash: podfileLockHash,
+      ).toJson().entries)
+        if (entry.value != null) entry.key: '${entry.value}',
+    };
     request.fields.addAll(payload);
 
     final response = await _httpClient.send(request);

packages/shorebird_code_push_client/test/src/code_push_client_test.dart

@@ -1,7 +1,6 @@
 import 'dart:convert';
 import 'dart:io';
 
-import 'package:collection/collection.dart';
 import 'package:http/http.dart' as http;
 import 'package:mocktail/mocktail.dart';
 import 'package:path/path.dart' as path;
@@ -468,21 +467,18 @@ void main() {
       const size = 5;
       const canSideload = true;
 
-      group('when podfileLockHash is provided', () {
+      // Multipart form fields are always strings on the wire, so the
+      // expected payloads are spelled out as Map<String, String>.
+      // CreateReleaseArtifactRequest.toJson() returns JSON types (bool,
+      // int, enum→string, etc.); the client stringifies at the multipart
+      // boundary and drops null-valued keys (see createReleaseArtifact
+      // in code_push_client.dart).
+      group('when podfileLockHash is null', () {
         test('makes the correct request', () async {
           final tempDir = Directory.systemTemp.createTempSync();
           final fixture = File(path.join(tempDir.path, 'release.txt'))
             ..createSync()
             ..writeAsStringSync('hello');
-          const expectedRequest = CreateReleaseArtifactRequest(
-            arch: arch,
-            platform: platform,
-            hash: hash,
-            size: size,
-            canSideload: canSideload,
-            filename: 'release.txt',
-            podfileLockHash: null,
-          );
 
           try {
             await codePushClient.createReleaseArtifact(
@@ -508,31 +504,24 @@ void main() {
             equals(v1('apps/$appId/releases/$releaseId/artifacts')),
           );
           expect(request.hasHeaders(expectedHeaders), isTrue);
-          expect(
-            const MapEquality<String, dynamic>().equals(
-              request.fields,
-              expectedRequest.toJson(),
-            ),
-            isTrue,
-          );
+          expect(request.fields, <String, String>{
+            'arch': arch,
+            'platform': platform.name,
+            'hash': hash,
+            'filename': 'release.txt',
+            'can_sideload': 'true',
+            'size': '$size',
+            // podfile_lock_hash absent.
+          });
         });
       });
 
-      group('when podfileLockHash is null', () {
+      group('when podfileLockHash is provided', () {
         test('makes the correct request', () async {
           final tempDir = Directory.systemTemp.createTempSync();
           final fixture = File(path.join(tempDir.path, 'release.txt'))
             ..createSync()
             ..writeAsStringSync('hello');
-          const expectedRequest = CreateReleaseArtifactRequest(
-            arch: arch,
-            platform: platform,
-            hash: hash,
-            size: size,
-            canSideload: canSideload,
-            filename: 'release.txt',
-            podfileLockHash: podfileLockHash,
-          );
 
           try {
             await codePushClient.createReleaseArtifact(
@@ -558,13 +547,15 @@ void main() {
             equals(v1('apps/$appId/releases/$releaseId/artifacts')),
           );
           expect(request.hasHeaders(expectedHeaders), isTrue);
-          expect(
-            const MapEquality<String, dynamic>().equals(
-              request.fields,
-              expectedRequest.toJson(),
-            ),
-            isTrue,
-          );
+          expect(request.fields, <String, String>{
+            'arch': arch,
+            'platform': platform.name,
+            'hash': hash,
+            'filename': 'release.txt',
+            'can_sideload': 'true',
+            'size': '$size',
+            'podfile_lock_hash': podfileLockHash,
+          });
         });
       });
 
@@ -2047,7 +2038,7 @@ void main() {
         setUp(() {
           membership = OrganizationMembership(
             role: Role.admin,
-            organization: Organization.forTest(),
+            organization: organizationForTest(),
           );
           response = GetOrganizationsResponse(organizations: [membership]);
           when(() => httpClient.send(any())).thenAnswer(