Grant View All Fields to a PermissionSet based on a Profile or Pset

grant-view-all-fields.cls

//name of Pset to grant access to - must already exist.
final string pSetName = 'ViewAllFieldsAdmin';
//profile takes priority if both are set. can specify same pset as above or a different one.
final string baseProfileForObjectAccess = 'System Administrator';
final string basePermissionSetForObjectAccess = null;

//do not edit below this line
Id pSetToGrantVAFId = [SELECT Id FROM PermissionSet WHERE Name = :pSetName LIMIT 1].Id;
Id pSetForBaseObjectId;
if (baseProfileForObjectAccess != null) {
    pSetForBaseObjectId = [SELECT Id FROM PermissionSet WHERE Profile.Name = :baseProfileForObjectAccess LIMIT 1].Id;
} else {
    pSetForBaseObjectId = [SELECT Id FROM PermissionSet WHERE Name = :basePermissionSetForObjectAccess LIMIT 1].Id;
}

List<ObjectPermissions> objectPermissionsBase = 
	[SELECT Id, SObjectType, PermissionsViewAllFields FROM ObjectPermissions
	 WHERE ParentId = :pSetForBaseObjectId];
boolean isUpsert = pSetForBaseObjectId == pSetToGrantVAFId;

List<ObjectPermissions> objectPermissionsNew;
if (isUpsert) {
    objectPermissionsNew = objectPermissionsBase;
} else {
    objectPermissionsNew =
	    [SELECT Id, SObjectType, PermissionsViewAllFields FROM ObjectPermissions
	     WHERE ParentId = :pSetToGrantVAFId];
}
Map<string, ObjectPermissions> objectNameToPermissionsMap = new Map<string, ObjectPermissions>();
for (ObjectPermissions op : objectPermissionsNew) {
    objectNameToPermissionsMap.put(op.SObjectType, op);
}

List<ObjectPermissions> opToUpsertList = new List<ObjectPermissions>();
for (ObjectPermissions op : objectPermissionsBase) {
    ObjectPermissions opToUpsert = objectNameToPermissionsMap.get(op.SObjectType);
    if (opToUpsert == null) {
        opToUpsert = new ObjectPermissions(
        	ParentId = pSetToGrantVAFId,
        	SObjectType = op.SObjectType
        );
    } else if (opToUpsert.PermissionsViewAllFields) {
        continue;
    }
    opToUpsert.PermissionsViewAllFields = true;
    opToUpsertList.add(opToUpsert);
}

//some standard objects are weird...
Database.upsert( opToUpsertList, ObjectPermissions.Id, false);