Add schema provided checks for library.properties author field

check/checkconfigurations/checkconfigurations.go

@@ -176,6 +176,36 @@ var configurations = []Type{
 		ErrorModes:      nil,
 		CheckFunction:   checkfunctions.LibraryPropertiesVersionFieldNonSemver,
 	},
+	{
+		ProjectType:     projecttype.Library,
+		Category:        "library.properties",
+		Subcategory:     "author field",
+		ID:              "",
+		Brief:           "missing author field",
+		Description:     "",
+		MessageTemplate: "missing required author field in library.properties. See https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format",
+		DisableModes:    nil,
+		EnableModes:     []checkmode.Type{checkmode.All},
+		InfoModes:       nil,
+		WarningModes:    nil,
+		ErrorModes:      []checkmode.Type{checkmode.All},
+		CheckFunction:   checkfunctions.LibraryPropertiesAuthorFieldMissing,
+	},
+	{
+		ProjectType:     projecttype.Library,
+		Category:        "library.properties",
+		Subcategory:     "author field",
+		ID:              "",
+		Brief:           "author < min length",
+		Description:     "",
+		MessageTemplate: "library.properties author value is less than minimum length",
+		DisableModes:    nil,
+		EnableModes:     []checkmode.Type{checkmode.All},
+		InfoModes:       nil,
+		WarningModes:    nil,
+		ErrorModes:      []checkmode.Type{checkmode.All},
+		CheckFunction:   checkfunctions.LibraryPropertiesAuthorFieldLTMinLength,
+	},
 	{
 		ProjectType:     projecttype.Library,
 		Category:        "library.properties",

check/checkfunctions/library.go

@@ -146,6 +146,35 @@ func LibraryPropertiesVersionFieldNonSemver() (result checkresult.Type, output s
 	return checkresult.Pass, ""
 }
 
+// LibraryPropertiesAuthorFieldMissing checks for missing library.properties "author" field.
+func LibraryPropertiesAuthorFieldMissing() (result checkresult.Type, output string) {
+	if checkdata.LibraryPropertiesLoadError() != nil {
+		return checkresult.NotRun, ""
+	}
+
+	if schema.RequiredPropertyMissing("author", checkdata.LibraryPropertiesSchemaValidationResult()[compliancelevel.Specification], configuration.SchemasPath()) {
+		return checkresult.Fail, ""
+	}
+	return checkresult.Pass, ""
+}
+
+// LibraryPropertiesAuthorFieldLTMinLength checks if the library.properties "author" value is less than the minimum length.
+func LibraryPropertiesAuthorFieldLTMinLength() (result checkresult.Type, output string) {
+	if checkdata.LibraryPropertiesLoadError() != nil {
+		return checkresult.NotRun, ""
+	}
+
+	if !checkdata.LibraryProperties().ContainsKey("author") {
+		return checkresult.NotRun, ""
+	}
+
+	if schema.PropertyLessThanMinLength("author", checkdata.LibraryPropertiesSchemaValidationResult()[compliancelevel.Specification], configuration.SchemasPath()) {
+		return checkresult.Fail, ""
+	}
+
+	return checkresult.Pass, ""
+}
+
 // LibraryPropertiesDependsFieldNotInIndex checks whether the libraries listed in the library.properties `depends` field are in the Library Manager index.
 func LibraryPropertiesDependsFieldNotInIndex() (result checkresult.Type, output string) {
 	if checkdata.LibraryPropertiesLoadError() != nil {