I am having a problem that has been reported here and elsewhere before: not being able to change the recurrence pattern on a master via EWS. First, I tried using the old proxy classes against E2010. I have also now tried using the 2.0 Managed API, to no avail. The error FWIW is "Set action is invalid for property". E.g. I want to change the recurrence end date, or the number of recurrences.
In an MSDN post from 2008, Dave Stirling mentions that only the organizer should be able to do this. This is a problem for me because my server application uses a single, full-access id to manage all of the room resource calendars in an enterprise. With this user I can delete appointments on any calendar, regardless of organizer, and I can certainly update a single instance of a recurring series, e.g. changing its start time. I don't understand why manipulating the recurrence pattern would be prohibited because I'm not the organizer while manipulating an instance's spot on the calendar, or deleting the entire series would not be.
I have also tried using impersonation, so that I am (I think) impersonating the Room resource itself, in which case, even though I am not the organizer, I feel I must be the owner of the appointment, and hence entitled to do whatever the heck I want to it. I guess Exchange feels differently. Managed API code below, FWIW.
TIA,
Paul
var Svc = new ExchangeService(ExchangeVersion.Exchange2010, TimeZoneInfo.Local);
Svc.CookieContainer = new CookieContainer();
Svc.Credentials = new WebCredentials(m_SvcUser, m_SvcPswd);
Svc.EnableScpLookup = false;
Svc.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, m_RoomMB);
Svc.AutodiscoverUrl(m_RoomMB, RedirectionCallback);
var Master = Appointment.Bind(Svc, new ItemId(args[0]), m_Props);
if (Master.Recurrence.NumberOfOccurrences != null)
Master.Recurrence.NumberOfOccurrences--;
else
Master.Recurrence.EndDate = DateTime.Now;
Master.Update(ConflictResolutionMode.AlwaysOverwrite, SendInvitationsOrCancellationsMode.SendToNone);
To close this out, I will report that I opened this question as a support issue after getting no responses here or on MSDN. The net of it is this: Exchange does not permit an attendee (in this case a conference room I am impersonating in EWS) to change the recurrence "blob." This is by design. The only user who can do so is the organizer. I'm not sure this really makes complete sense to me, but I don't have much say in the matter, now do I?
Related
I've successfully installed and run the Google Drive Quick Start application called DriveCommandLine. I've also adapted it a little to GET file info for one of the files in my Drive account.
What I would like to do now is save the credentials somehow and re-use them without the user having to visit a web page each time to get an authorization code. I have checked out this page with instructions to Retrieve and Use OAuth 2.0 credentials. In order to use the example class (MyClass), I have modified the line in DriveCommandLine where the Credential object is instantiated:
Credential credential = MyClass.getCredentials(code, "");
This results in the following exception being thrown:
java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)
at com.google.api.client.json.jackson.JacksonFactory.createJsonParser(JacksonFactory.java:84)
at com.google.api.client.json.JsonFactory.fromInputStream(JsonFactory.java:247)
at com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets.load(GoogleClientSecrets.java:168)
at googledrive.MyClass.getFlow(MyClass.java:145)
at googledrive.MyClass.exchangeCode(MyClass.java:166)
at googledrive.MyClass.getCredentials(MyClass.java:239)
at googledrive.DriveCommandLine.<init>(DriveCommandLine.java:56)
at googledrive.DriveCommandLine.main(DriveCommandLine.java:115)
I've been looking at these APIs (Google Drive and OAuth) for 2 days now and have made very little progress. I'd really appreciate some help with the above error and the problem of getting persistent credentials in general.
This whole structure seems unnecessarily complicated to me. Anybody care to explain why I can't just create a simple Credential object by passing in my Google username and password?
Thanks,
Brian O Carroll, Dublin, Ireland
* Update *
Ok, I've just gotten around the above error and now I have a new one.
The way I got around the first problem was by modifying MyClass.getFlow(). Instead of creating a GoogleClientServices object from a json file, I have used a different version of GoogleAuthorizationCodeFlow.Builder that allows you to enter the client ID and client secret directly as Strings:
flow = new GoogleAuthorizationCodeFlow.Builder(httpTransport, jsonFactory, "<MY CLIENT ID>", "<MY CLIENT SECRET>", SCOPES).setAccessType("offline").setApprovalPrompt("force").build();
The problem I have now is that I get the following error when I try to use flow (GoogleAuthorizationCodeFlow object) to exchange the authorization code for the Credentials object:
An error occurred: com.google.api.client.auth.oauth2.TokenResponseException: 400 Bad Request
{
"error" : "invalid_scope"
}
googledrive.MyClass$CodeExchangeException
at googledrive.MyClass.exchangeCode(MyClass.java:185)
at googledrive.MyClass.getCredentials(MyClass.java:262)
at googledrive.DriveCommandLine.<init>(DriveCommandLine.java:56)
at googledrive.DriveCommandLine.main(DriveCommandLine.java:115)
Is there some other scope I should be using for this? I am currently using the array of scopes provided with MyClass:
private static final List<String> SCOPES = Arrays.asList(
"https://www.googleapis.com/auth/drive.file",
"https://www.googleapis.com/auth/userinfo.email",
"https://www.googleapis.com/auth/userinfo.profile");
Thanks!
I feel your pain. I'm two months in and still getting surprised.
Some of my learnings...
When you request user permissions, specify "offline=true". This will ("sometimes" sic) return a refreshtoken, which is as good as a password with restricted permissions. You can store this and reuse it at any time (until the user revokes it) to fetch an access token.
My feeling is that the Google SDKs are more of a hinderence than a help. One by one, I've stopped using them and now call the REST API directly.
On your last point, you can (just) use the Google clientlogin protocol to access the previous generation of APIs. However this is totally deprecated and will shortly be turned off. OAuth is designed to give fine grained control of authorisation which is intrinsically complex. So although I agree it's complicated, I don't think it's unnecessarily so. We live in a complicated world :-)
Your and mine experiences show that the development community is still in need of a consolidated document and recipes to get this stuff into our rear-view mirrors so we can focus on the task at hand.
Oath2Scopes is imported as follows:
import com.google.api.services.oauth2.Oauth2Scopes;
You need to have the jar file 'google-api-services-oauth2-v2-rev15-1.8.0-beta.jar' in your class path to access that package. It can be downloaded here.
No, I don't know how to get Credentials without having to visit the authorization URL at least once and copy the code. I've modified MyClass to store and retrieve credentials from a database (in my case, it's a simple table that contains userid, accesstoken and refreshtoken). This way I only have to get the authorization code once and once I get the access/refresh tokens, I can reuse them to make a GoogleCredential object. Here's how Imake the GoogleCredential object:
GoogleCredential credential = new GoogleCredential.Builder().setJsonFactory(jsonFactory)
.setTransport(httpTransport).setClientSecrets(clientid, clientsecret).build();
credential.setAccessToken(accessToken);
credential.setRefreshToken(refreshToken);
Just enter your clientid, clientsecret, accessToken and refreshToken above.
I don't really have a whole lot of time to separate and tidy up my entire code to post it up here but if you're still having problems, let me know and I'll see what I can do. Although, you are effectively asking a blind man for directions. My understanding of this whole system is very sketchy!
Cheers,
Brian
Ok, I've finally solved the second problem above and I'm finally getting a working GoogleCredential object with an access token and a refresh token.
I kept trying to solve the scopes problem by modifying the list of scopes in MyClass (the one that manages credentials). In the end I needed to adjust the scopes in my modified version of DriveCommandLine (the one that's originally used to get an authorization code). I added 2 scopes from Oauth2Scopes:
GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
httpTransport, jsonFactory, CLIENT_ID, CLIENT_SECRET,
Arrays.asList(DriveScopes.DRIVE, Oauth2Scopes.USERINFO_EMAIL, Oauth2Scopes.USERINFO_PROFILE))
.setAccessType("offline").setApprovalPrompt("force").build();
Adding the scopes for user information allowed me to get the userid later in MyClass. I can now use the userid to store the credentials in a database for re-use (without having to get the user to go to a URL each time). I also set the access type to "offline" as suggested by pinoyyid.
i am able to retrieve lists of contacts for specified mailboxes using exchange web services. my issue is that some of the contacts returned have been deleted by the outlook user, and i need to determine which ones. how can i do this?
all the examples i've seen online use this method, but never for contacts.
i have tried setting the Traversal property of the ItemView variable to SoftDeleted, but that does not return anything.
below is the pertinent portion of my code:
ItemView itemViewDeleted = new ItemView(100);
itemViewDeleted.Traversal = ItemTraversal.SoftDeleted;
FindItemsResults<Item> deletedItems = svc.FindItems(WellKnownFolderName.Contacts, itemViewDeleted);
You need to check the WellKnownFolderName.DeletedItems folder. That is where my contacts go when I delete them.
There are (3) ways to delete a Contact. See TechNet for Exchange terminology reference.
Delete (moved to Deleted Items folder - WellKnownFolderName.DeletedItems)
Soft Delete (moved to Recoverable Items folder - WellKnownFolderName.RecoverableItemsDeletions)
Hard Delete (purged from mailbox - WellKnownFolderName.RecoverableItemsPurges)
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I (like most tech admins I guess) have quite a lot of status infos from scheduled services in my inbox. However when one service email fails there's obviously no email sent. So I simply want a service looking at my inbox saying "Hey this service did not send an email report yesterday - somethings wrong!".
This one should be solved somewhere I guess. Perhaps Gmail (or some other email provider) has a service of this kind, that would be great.
Wouldn't it be a better option to have a centralized monitoring solution like Nagios that you configure in such way that it only send out notifications when a service misses its heartbeat, reaches highwatermarks, run out of fuel? And then off course of a second monitoring solution that monitors the main monitoring solution....
http://www.nagios.org/documentation
I'm not aware of any service you describe but a manual routine might go like this:
Have a folder/tag structure like this:
Services\Hourly-[NumberOfServices] (or add a folder per service)
Services\Daily-[NumberOfServicves]
Services\Weekly-[NumberOfServicves]
Services\Monthly-[NumberOfServicves]
Have rules for incoming mail to filter each specific service notification and move it to the right folder based on its expected timing.
Wakeup every hour and check if there are unread messages in your Hourly folder. The number of unread should be the same as the NumberOfServices mentioned in the folder. Read/Process them and make sure to all mark them as Read. Any service that didn't e-mailed get's spotted easily.
Wakeup at 0:00 and check if there are unread messages in your Daily folder. etc etc..
Wakeup at 0:00 and Saturday and check if there are unread messages in your Weekly folder. etc.....
Wakeup at 0:00 on the first of the month and check if there are unread messages in your Weekly folder. etc etc etc...
My advice would be to cut down the noise generated by the services.
If you still feel you need a service I can only provide a very very basic .Net implementation roughly based on the above process and works with gmail...
This is also portable to powershell...
static void Main(string[] args)
{
var resolver = new XmlUrlResolver
{
Credentials = new NetworkCredential("yourgoolgeaccount", "yourpassword")
};
var settings = new XmlReaderSettings();
settings.XmlResolver = resolver;
var xr = XmlReader
.Create("https://mail.google.com/mail/feed/atom/[name of your filter]"
, settings);
var navigator = new XPathDocument(xr).CreateNavigator();
var ns = new XmlNamespaceManager(new NameTable());
ns.AddNamespace("fd", "http://purl.org/atom/ns#");
var fullcountNode = navigator.SelectSingleNode(
"/fd:feed/fd:fullcount"
, ns);
Console.WriteLine(fullcountNode.Value);
int fullcount = Int32.Parse(fullcountNode.Value);
int expectCount = 10;
if (expectCount > fullcount)
{
Console.WriteLine("*** NOT EVERY ONE REPORTED BACK");
}
}
You mentioned Gmail, so you may be interested in googlecl, which gives you command-line controls for things like Google Calendar and Docs. Unfortunately they do not yet support Gmail, but if your long-term preference is to use a Gmail account as the hub of your status reports, then googlecl may be your best option.
In the short run, you can try out googlecl right now using the commands for Calendar, Blogger, or Docs, all of which are already supported. For example, these commands add events to Google Calendar:
google calendar add --cal server1 "I'm still alive at 13:45 today"
google calendar add "Server 1 is still alive at 2011-02-08 19:43"
...and these commands query the calendar:
google calendar list --fields title,when,where --cal "commitments"
google calendar list -q party --cal ".*"
Come to think of it, you may even find that Calendar, Blogger, or Docs are a more appropriate place than Gmail for tracking status updates. For example, a spreadsheet or calendar format should make it easier to generate a graphical representation of when a given service was up or down.
You still need to write a little program which uses googlecl to query the calendar (or blog, or docs, or whatever), but once you have simple command lines at your disposal, the rest should be pretty straightforward. Here's a link to further information about googlecl:
http://code.google.com/p/googlecl/
If you really want to use Gmail, and use it right now, they offer an IMAP interface. Using IMAP, you can perform numerous simple operations, such as determining if a message exists which contains a specified subject line. Here's one good place to learn about the details:
http://mail.google.com/support/bin/answer.py?hl=en&answer=75725
Here's a quick example that uses IMAP and Python to list the ten most-recent emails which have a given Gmail "Label":
import getpass, imaplib
# These gmail_* utilties are from https://github.com/drewbuschhorn/gmail_imap
import gmail_mailboxes, gmail_messages, gmail_message
# Update these next lines manually, or turn them into parms or somesuch.
gmail_account_name = "your_user_name#gmail.com" # Your full gmail address.
mailbox_name = "StatusReports" # Use Gmail "labels" to tag the relevant msgs.
class gmail_imap:
def __init__ (self, username, password):
self.imap_server = imaplib.IMAP4_SSL("imap.gmail.com",993)
self.username = username
self.password = password
self.loggedIn = False
self.mailboxes = gmail_mailboxes.gmail_mailboxes(self)
self.messages = gmail_messages.gmail_messages(self)
def login (self):
self.imap_server.login(self.username,self.password)
self.loggedIn = True
def logout (self):
self.imap_server.close()
self.imap_server.logout()
self.loggedIn = False
# Right now this prints a summary of the most-recent ten (or so) messages
# which have been labelled in Gmail with the string found in mailbox_name.
# It won't work unless you've used Gmail settings to allow IMAP access.
if __name__ == '__main__':
gmail = gmail_imap(gmail_account_name,getpass.getpass())
gmail.messages.process(mailbox_name)
for next in gmail.messages:
message = gmail.messages.getMessage(next.uid)
# This is a good point in the code to insert some kind of search
# of gmail.messages. Instead of unconditionally printing every
# entry (which is what the code below does), issue some sort of
# warning if the expected email (message.From and message.Subject)
# did not arrive within the expected time frame (message.date).
print message.date, message.From, message.Subject
gmail.logout()
As noted in the code comments, you could adapt it to issue some sort of warning if the most-recent messages in that mailbox do not contain an expected message. Then just run the Python program once per day (or whatever time period you require) to see if the expected email message was never received.
I have a bot in node.js and I'm wondering what logic I should use for a .tell function. The purpose of the function will be to give a message to users who are offline. So, if john was offline on freenode.net/#foo and I typed .tell john your mother was great last night, I want the bot to store this message and display it whenever john joins the channel.
If john is already in the channel, I want the bot to immediately just display the message.
I am already using mongodb as a database to store information, so I can probably store all my messages in there. Here's the logic I had in mind so far:
1. After user A types .tell john your mother was great, a listener will pickup the pattern /\.tell ([\w-]+) (.*)/ and store a variable for the message ( var msg, the user who posted the message ( var from ), and the name of the user to be messaged ( var to ). I will also have a global variable signifying the channel name and network of the server.
2. I'll store a row in mongodb such as:
to from message network channel delivered time
--------------------------------------------------------------------------------
john meder your mother was great freenode.net #foobar 0 (TS)
last night
3. Setup a listener for anyone joining a channel since the bot can live in multiple channels under one network, and detect if there any messages that are not delivered and if there are, attempt to match the to and network and channel to the stored messages, and if row(s) are found, display them.
This sounds ok, but can anyone review it and maybe offer advice? I'll be forced to have a listener listen for anyone entering any channel, right? There's no alternative to that?
This seems all fine. I don't see how you could not have a listener.
One thing I'd add is maybe a hash in the bot to keep track of who has pending messages. This way you won't be querying MongoDB every time someone joins a channel.
I.e.
messages = {};
messages['freenode.net'] = {};
messages['freenode.net']['john'] = 1;
Might be overkill, but if your monitoring a channel that has many JOINs, you might find yourself querying MongoDB a lot.
My two cents.
Christian
I'm really struggling to wrap my head around some of this stuff. Let me give an example of where I'm struggling.
I'm using Linq-2-Sql as the DAL for my app and the IRepository pattern used in the MVC Storefront sample app from Rob Conery.
In my domain I have a Customer Model which has a collection of Address Models. In my UI there is a button which allows the user to add a new address to the customer. This opens up an address editor which let's them fill in all the information.
What happens next? Does the address get saved to the database, then added to the list in my customer object? Does it just get added to the list but not updated until the Customer object get's saved? What if the user wants to delete an address? Do I delete the address in the database and then remove it from the list? Or do they just make all the deletes/adds they want and I dump everything from the database everytime and update it with whatever is in the Customer.Addresses collection? What's the right flow here?
Should the collection of addresses only get updated via the Repository by calling something like this:
public void AddAddressToCustomer(Customer c, Address a)
{
//validate and save address to db
//add the newly saved address to the Customer Object
}
Help...
DDD is an area where I have a lot of interest but but very little experience so please treat my suggestions cautiously. I only offer them because of the absence of other, more authoritative, answers.
In 'the book' by Eric Evans address is given as an example of something that should typically be treated as a Value Object rather than as an Entity. So I believe the Add method would belong to the Customer:
customer.Add(address);
There would be a Customer Repository (but not one for addresses). This might be used like this:
customerRepository.Update(customer);
The intentional affect of this is that all the difficult questions you ask about how this is then implemented at the DB layer are not the concern of the domain objects (i.e. the customer object). I'm afraid I can't help beyond that point either.
Sounds like you don't know the context of your domain as well as you need to. Ask some more questions and get a better user story. Potentially any of your proposed scenarios may meet the business need, depending on what it is. When you understand the need then I believe this issue will iron itself out.
it depends had a great start on the answer. Once you add the address to the customer and save the customer using:
customer.Add(address);
customerRepository.Update(customer);
Your repository would then map your customer and address domain layer entities to LINQ to SQL. This will likely involve creating a new DataContext object, getting the related LINQ to SQL entities (or creating new ones) and then mapping the domain layer entities to your LINQ to SQL entities.
var context = new MyDataContext();
var linqCustomer = MapCustomerToLinqCustomer(context, customer);
var linqAddress = MapAddressToLinqAddress(context, customer.Addresses.First());
context.SubmitChanges();
You could also use DataMapper classes for mapping, but the MapXYZ methods more closely follow Rob Conery's example. If you need more help with the MapXYZ methods, let me know.