Cherry-pick 0e6ba3e. rdar://125791668

    Add SPI for creating _WKApplicationManifest with data
    https://bugs.webkit.org/show_bug.cgi?id=272075
    rdar://125791668

    Reviewed by Chris Dumez.

    Test: WKApplicationManifest.EmptyJSONData
          WKApplicationManifest.JSONDataEncoding

    * Source/WebKit/UIProcess/API/Cocoa/_WKApplicationManifest.h:
    * Source/WebKit/UIProcess/API/Cocoa/_WKApplicationManifest.mm:
    (-[_WKApplicationManifest initWithJSONData:manifestURL:documentURL:]):
    * Tools/TestWebKitAPI/Tests/WebKitCocoa/ApplicationManifest.mm:
    (TestWebKitAPI::TEST(WKApplicationManifest, EmptyJSONData)):
    (TestWebKitAPI::TEST(WKApplicationManifest, JSONDataEncoding)):

    Canonical link: https://commits.webkit.org/277014@main

Canonical link: https://commits.webkit.org/272448.870@safari-7618-branch

Source/WebKit/UIProcess/API/Cocoa/_WKApplicationManifest.h

@@ -63,6 +63,9 @@ typedef NS_ENUM(NSInteger, _WKApplicationManifestIconPurpose) {
 WK_CLASS_AVAILABLE(macos(10.13.4), ios(11.3))
 @interface _WKApplicationManifest : NSObject <NSSecureCoding>
 
+- (instancetype)init NS_UNAVAILABLE;
+- (nullable instancetype)initWithJSONData:(NSData *)jsonData manifestURL:(NSURL *)manifestURL documentURL:(NSURL *)documentURL WK_API_AVAILABLE(macos(WK_MAC_TBA), ios(WK_IOS_TBA));
+
 @property (nonatomic, readonly, nullable, copy) NSString *rawJSON;
 @property (nonatomic, readonly, nullable, copy) NSString *name;
 @property (nonatomic, readonly, nullable, copy) NSString *shortName;

Source/WebKit/UIProcess/API/Cocoa/_WKApplicationManifest.mm

@@ -243,6 +243,22 @@ @implementation _WKApplicationManifest
 
 #if ENABLE(APPLICATION_MANIFEST)
 
+- (instancetype)initWithJSONData:(NSData *)jsonData manifestURL:(NSURL *)manifestURL documentURL:(NSURL *)documentURL
+{
+    if (!(self = [super init]))
+        return nil;
+
+    RetainPtr jsonString = adoptNS([[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]);
+    if (!jsonString)
+        return nil;
+
+    // FIXME: Return nil if jsonString cannot be deserialized into JSON object.
+    auto manifest = WebCore::ApplicationManifestParser::parse(jsonString.get(), URL(manifestURL), URL(documentURL));
+    API::Object::constructInWrapper<API::ApplicationManifest>(self, manifest);
+
+    return self;
+}
+
 + (BOOL)supportsSecureCoding
 {
     return YES;
@@ -465,6 +481,15 @@ - (NSURL *)manifestId
 
 #else // ENABLE(APPLICATION_MANIFEST)
 
+- (instancetype)initWithJSONData:(NSData *)jsonData manifestURL:(NSURL *)manifestURL documentURL:(NSURL *)documentURL
+{
+    UNUSED_PARAM(jsonData);
+    UNUSED_PARAM(manifestURL);
+    UNUSED_PARAM(documentURL);
+
+    return nil;
+}
+
 + (_WKApplicationManifest *)applicationManifestFromJSON:(NSString *)json manifestURL:(NSURL *)manifestURL documentURL:(NSURL *)documentURL
 {
     UNUSED_PARAM(json);

Tools/TestWebKitAPI/Tests/WebKitCocoa/ApplicationManifest.mm

@@ -399,6 +399,34 @@
     EXPECT_EQ(decodedIcon.purposes[1].unsignedLongValue, 4ul);
 }
 
+TEST(WKApplicationManifest, EmptyJSONData)
+{
+    RetainPtr<NSURL> manifestURL = [NSURL URLWithString:@"https://test.com/manifest.json"];
+    RetainPtr<NSURL> documentURL = [NSURL URLWithString:@"https://test.com"];
+
+    NSDictionary *emptyJSONObject = @{ };
+    RetainPtr emptyJSONData = [NSJSONSerialization dataWithJSONObject:emptyJSONObject options:0 error:nil];
+    RetainPtr manifest = adoptNS([[_WKApplicationManifest alloc] initWithJSONData:emptyJSONData.get() manifestURL:manifestURL.get() documentURL:documentURL.get()]);
+    EXPECT_NOT_NULL(manifest);
+}
+
+TEST(WKApplicationManifest, JSONDataEncoding)
+{
+    RetainPtr<NSURL> manifestURL = [NSURL URLWithString:@"https://test.com/manifest.json"];
+    RetainPtr<NSURL> documentURL = [NSURL URLWithString:@"https://test.com"];
+
+    NSString *jsonString = @"{ \"name\": \"TestName\" }";
+    RetainPtr jsonDataUTF8 = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
+    RetainPtr jsonDataUTF16 = [jsonString dataUsingEncoding:NSUTF32StringEncoding];
+    RetainPtr manifest = adoptNS([[_WKApplicationManifest alloc] initWithJSONData:jsonDataUTF8.get() manifestURL:manifestURL.get() documentURL:documentURL.get()]);
+    EXPECT_NOT_NULL(manifest);
+    EXPECT_WK_STREQ("TestName", manifest.get().name);
+
+    manifest = adoptNS([[_WKApplicationManifest alloc] initWithJSONData:jsonDataUTF16.get() manifestURL:manifestURL.get() documentURL:documentURL.get()]);
+    EXPECT_NULL(manifest);
+}
+
+
 } // namespace TestWebKitAPI
 
 #endif // ENABLE(APPLICATION_MANIFEST)