Hi Nick,
Yes ... here are the relevant details (extracted from my updated question
on stack overflow). First the secure URL specs:
<!-- Secure sensitive URLs -->
<security-constraint>
<web-resource-collection>
<url-pattern>/gcm/home</url-pattern>
<url-pattern>/gcm/send</url-pattern>
</web-resource-collection>
<auth-constraint>
<role-name>admin</role-name>
</auth-constraint>
</security-constraint>
Previously, in the client application, I was using ClientLogin to
authenticate with Google before calling the endpoint. This is the code I
was using, that extracts the "Auth" token which it then uses as a Cookie on
HTTP GET to the above endpoints.
public static String loginToGoogle(String userid, String password,
String appUrl) throws Exception {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(
"https://www.google.com/accounts/ClientLogin";);
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("accountType", new StringBody("HOSTED_OR_GOOGLE",
"text/plain", Charset.forName("UTF-8")));
reqEntity.addPart("Email", new StringBody(userid));
reqEntity.addPart("Passwd", new StringBody(password));
reqEntity.addPart("service", new StringBody("ah"));
reqEntity.addPart("source", new StringBody("WWWWmyappname"));
post.setEntity(reqEntity);
HttpResponse response = client.execute(post);
if (response.getStatusLine().getStatusCode() == 200) {
InputStream input = response.getEntity().getContent();
String result = IOUtils.toString(input);
String authToken = getAuthToken(result);
post = new HttpPost(appUrl + "/_ah/login?auth=" + authToken);
response = client.execute(post);
Header[] cookies = response.getHeaders("SET-COOKIE");
for (Header cookie : cookies) {
if (cookie.getValue().startsWith("ACSID=")) {
return cookie.getValue();
}
}
throw new Exception("ACSID cookie cannot be found");
} else
throw new Exception("Error obtaining ACSID");
}
private static String getAuthToken(String responseText) throws
Exception {
LineNumberReader reader = new LineNumberReader(new StringReader(
responseText));
String line = reader.readLine();
while (line != null) {
line = line.trim();
if (line.startsWith("Auth=")) {
return line.substring(5);
}
line = reader.readLine();
}
throw new Exception("Could not find Auth token");
}
Calling the gcm endpoint:
HttpGet get = new HttpGet(httpURL);
get.setHeader("Cookie", authCookie);
HttpResponse response = client.execute(get);
response.getEntity().writeTo(System.out);
where "authCookie" is the token obtained from loginToGoogle above.
Thanks so much for helping with this!
Julian
On Fri, Aug 14, 2015 at 2:03 PM, Nick (Cloud Platform Support) <
pay...@google.com> wrote:
> A quick question, is it possible you could provide the skeleton code for
> your client project? It appears to be a standalone java program, rather
> than a web app, yes?
>
>
> On Wednesday, August 12, 2015 at 5:00:53 PM UTC-4, Julian Bunn wrote:
>>
>> Hi Nick,
>>
>> Thanks for much for persisting with your help!
>>
>> Yes. your understanding is correct: I'd like to use a service account to
>> login so that I can make requests to an admin route of my app.
>>
>> Under "Credentials" in the new Google Developers Console, I see the
>> Service Account listed in the OAuth section, with its ID, email address and
>> certificate fingerprints.
>>
>> Under "Permissions" in the Console, I have my own account and a
>> maintenance account listed as Owners. On the same page, under "Service
>> Accounts" I have three listed, all having Edit permission. One of these is
>> the same account listed in "Credentials". (The other two are @cloudservices
>> and @developer.gservice accounts - I don't know where they came from, as I
>> don't recall creating them).
>>
>> On the old version of the Developers Console, I can see that the
>> Authentication Type is set to Google Accounts API. On there I can also see
>> the Service Account Name but it is different from the Service Account
>> listed under Credentials (above) - which is confusing me.
>>
>> The web xml for the deployment includes:
>>
>> <!-- Secure sensitive URLs -->
>> <security-constraint>
>> <web-resource-collection>
>> <url-pattern>/gcm/home</url-pattern>
>> <url-pattern>/gcm/send</url-pattern>
>> </web-resource-collection>
>> <auth-constraint>
>> <role-name>admin</role-name>
>> </auth-constraint>
>> </security-constraint>
>>
>> These are the two endpoints I need to call from the client.
>>
>> Thanks again!
>> Julian
>>
>>
>>
>> On Wednesday, August 12, 2015 at 1:28:20 PM UTC-7, Nick (Cloud Platform
>> Support) wrote:
>>>
>>> Hi Julian,
>>>
>>> OAuth2 is a complex topic and has many methods of application, being
>>> just an authentication/authorization protocol, and having many possible
>>> uses / forms of appearance (client-server, server-server, 3-legged, etc.)
>>>
>>> From your comments, I can now understand you're using login: admin on a
>>> route of your app, and you'd like to know how to make requests to a route
>>> on your app protected in such a manner, using a service account to login.
>>> Is that accurate?
>>>
>>> Could you let me know whether the service account is added as an admin
>>> of your application in the Developers Console under "Credentials" and
>>> whether your app's authentication method is set to "Google Accounts"?
>>>
>>> On Monday, August 10, 2015 at 8:10:35 PM UTC-4, Julian Bunn wrote:
>>>>
>>>> Hi Nick,
>>>>
>>>> Thanks ...
>>>>
>>>> GAE is doing the authentication. My GAE app has endpoints (i.e. urls
>>>> like my.appspot.com/gcm/home) that can only be executed by an admin
>>>> who is logged in. There is nothing special I have implemented to support
>>>> this, I am just using Google's GAE infrastructure.
>>>>
>>>> So, in the past, all I needed to do from a client application was to
>>>> call ClientLogin with a user/pass pair, which would return me a token which
>>>> could then be sent as a Cookie in calls to the GAE endpoints.
>>>>
>>>> This worked very well!
>>>>
>>>> Now that ClientLogin has been disabled, I am looking for an alternative
>>>> to it. I apparently need to use OAuth2, but there is no documentation that
>>>> seems to match my use case, unhappily. Use cases seem to assume the use of
>>>> various Google APIs, which I am not using.
>>>>
>>>> Thanks anyway.
>>>>
>>>> Julian
>>>>
>>>>
>>>>
>>>> On Mon, Aug 10, 2015 at 4:13 PM, Nick (Cloud Platform Support) <
>>>> pay...@google.com> wrote:
>>>>
>>>>> Hi Julian,
>>>>>
>>>>> The example code given there might be dealing with the Drive API, but
>>>>> APIs in this context are quite abstract, and you can easily substitute any
>>>>> Google API.
>>>>>
>>>>> Reading back over your question, I'm not sure you've supplied enough
>>>>> information for anybody to help answer. What exactly is doing the
>>>>> authenticating? Is your endpoint a Cloud Endpoints
>>>>> <https://cloud.google.com/appengine/docs/java/endpoints/> endpoint?
>>>>> It's not really clear to me what is doing the authentication at your
>>>>> "endpoint". Do you just mean that you've deployed with "login: admin"?
>>>>>
>>>>> At any rate, this forum, as mentioned, isn't meant for 1-on-1
>>>>> technical support, so I don't think you should continue to follow-up in
>>>>> this thread, and should either improve the stackoverflow question to
>>>>> clarify exactly what you're expecting to happen in technical language and
>>>>> specifics, or else post a new question which does include that
>>>>> information.
>>>>> That will enable people to help you better.
>>>>>
>>>>> Best wishes,
>>>>>
>>>>> Nick
>>>>>
>>>>>
>>>>>
>>>>> On Saturday, August 8, 2015 at 1:51:24 PM UTC-4, Julian Bunn wrote:
>>>>>>
>>>>>> Hi Jason,
>>>>>>
>>>>>> Yes:
>>>>>> http://stackoverflow.com/questions/31816007/authentication-with-google-app-engine-service-using-googlecredential-with-a-serv
>>>>>>
>>>>>> The suggestion there involves the Google Drive API, which is not
>>>>>> really helping me, as my GAE application does not use that API.
>>>>>>
>>>>>> Julian
>>>>>>
>>>>>> On Saturday, August 8, 2015 at 9:38:00 AM UTC-7, Jason Collins wrote:
>>>>>>>
>>>>>>> Julian, can you post your link to your SO question?
>>>>>>>
>>>>>>>
>>>>>>> On Thursday, 6 August 2015 12:20:28 UTC-7, Julian Bunn wrote:
>>>>>>>>
>>>>>>>> Hi Nick,
>>>>>>>>
>>>>>>>> Many thanks - I had already posted on stackoverflow with no luck,
>>>>>>>> so came here :-) I do have one reply now over there, which suggests
>>>>>>>> using
>>>>>>>> client secrets, so that is a good lead. Also your comments on the use
>>>>>>>> of
>>>>>>>> service account are well taken - it looks like that may be
>>>>>>>> inappropriate.
>>>>>>>>
>>>>>>>> Thanks for the pointers to the documentation, which I'd already
>>>>>>>> visited and read but ended up being confused - as is no doubt evident
>>>>>>>> from
>>>>>>>> my question :-)
>>>>>>>>
>>>>>>>> Julian
>>>>>>>>
>>>>>>>> On Wednesday, August 5, 2015 at 4:57:26 PM UTC-7, Nick (Cloud
>>>>>>>> Platform Support) wrote:
>>>>>>>>>
>>>>>>>>> Hi Julian,
>>>>>>>>>
>>>>>>>>> You've produced an excellent post which would belong on
>>>>>>>>> stackoverflow.com. Google Groups isn't the place to post specific
>>>>>>>>> technical issues, as this forum is meant more for general discussion
>>>>>>>>> of the
>>>>>>>>> platform and services.
>>>>>>>>>
>>>>>>>>> I'll give you the advice before you post there that it seems
>>>>>>>>> you've combined examples from different kinds of OAuth flow and this
>>>>>>>>> might
>>>>>>>>> be the cause of your issues. I see that there's a variable
>>>>>>>>> "emailScope" -
>>>>>>>>> this is a scope which a user would actually grant to your
>>>>>>>>> application, not
>>>>>>>>> one which a service account could grant.
>>>>>>>>>
>>>>>>>>> The service account and its credentials are used to call APIs on
>>>>>>>>> behalf of your application, although I don't think I've seen this
>>>>>>>>> pattern
>>>>>>>>> before, where you want to call an endpoint on your own app using a
>>>>>>>>> service
>>>>>>>>> account. As far as I know, service accounts have only been used to
>>>>>>>>> authenticate with Google APIs, although I suppose it might be
>>>>>>>>> possible to
>>>>>>>>> write an endpoint which correctly authenticates it.
>>>>>>>>>
>>>>>>>>> You could do some more reading on OAuth2
>>>>>>>>> <https://developers.google.com/identity/protocols/OAuth2>, OpenID
>>>>>>>>> Connect
>>>>>>>>> <https://developers.google.com/identity/protocols/OpenIDConnect?hl=en>,
>>>>>>>>> Service Accounts
>>>>>>>>> <https://developers.google.com/identity/protocols/OAuth2ServiceAccount>,
>>>>>>>>> and the Google Identity Platform
>>>>>>>>> <https://developers.google.com/identity/>, and try to repost your
>>>>>>>>> question to stackoverflow.com. That would be the best action as
>>>>>>>>> there are many more users there ready to help with a technical
>>>>>>>>> question.
>>>>>>>>>
>>>>>>>>> If you would like to open a thread in this forum discussing the
>>>>>>>>> platform or services in more broad terms, starting a discussion that
>>>>>>>>> would
>>>>>>>>> be useful for other users to join in to, feel free to do so.
>>>>>>>>>
>>>>>>>>> Have a great day!
>>>>>>>>>
>>>>>>>>> [1] http://www.stackoverflow.com/
>>>>>>>>> [2] http://www.serverfault.com/
>>>>>>>>> [3] http://code.google.com/p/google-appengine/issues/list
>>>>>>>>>
>>>>>>>>> On Wednesday, August 5, 2015 at 1:32:41 AM UTC-4, Julian Bunn
>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>> I have a GAE application with an endpoint that requires
>>>>>>>>>> authentication, which I need to call from an application (rather
>>>>>>>>>> than from
>>>>>>>>>> in a browser). I was using ClientLogin, but that is now obsolete, so
>>>>>>>>>> I have
>>>>>>>>>> set up a Service Account in the Google Console, and stored its
>>>>>>>>>> keypair .p12
>>>>>>>>>> file so that I can use the OAuth methods as described in the
>>>>>>>>>> documentation.
>>>>>>>>>>
>>>>>>>>>> Although the GoogleCredential builder successfully returns an
>>>>>>>>>> authorization token, if I then use that token in an HTTP get call to
>>>>>>>>>> the
>>>>>>>>>> endpoint, the response is always the Google Login page.
>>>>>>>>>>
>>>>>>>>>> Why, if I use the token, does GAE not take my application call as
>>>>>>>>>> authorized? Am I doing this all wrong or missing a step?
>>>>>>>>>>
>>>>>>>>>> Here is the code:
>>>>>>>>>>
>>>>>>>>>> String emailAddress = "xxxx...@developer.gserviceaccount.com";
>>>>>>>>>> JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
>>>>>>>>>> String emailScope =
>>>>>>>>>> "https://www.googleapis.com/auth/userinfo.email";;
>>>>>>>>>> String keyFileName = "YYYYY.p12";
>>>>>>>>>> String baseURL = "http://ZZZZZ.appspot.com";;
>>>>>>>>>> HttpTransport httpTransport;
>>>>>>>>>> try {
>>>>>>>>>> httpTransport = GoogleNetHttpTransport.newTrustedTransport();
>>>>>>>>>>
>>>>>>>>>> File keyFile = new File(keyFileName);
>>>>>>>>>> if(!keyFile.exists()) {
>>>>>>>>>> System.err.println("Key file "+keyFileName+" missing");
>>>>>>>>>> System.exit(0);
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> GoogleCredential credential = new GoogleCredential.Builder()
>>>>>>>>>> .setTransport(httpTransport)
>>>>>>>>>> .setJsonFactory(JSON_FACTORY)
>>>>>>>>>> .setServiceAccountId(emailAddress)
>>>>>>>>>> .setServiceAccountScopes(Collections.singleton(emailScope))
>>>>>>>>>> .setServiceAccountPrivateKeyFromP12File(keyFile)
>>>>>>>>>> .build();
>>>>>>>>>>
>>>>>>>>>> boolean success = credential.refreshToken();
>>>>>>>>>> System.out.println("Access token refresh "+ success);
>>>>>>>>>>
>>>>>>>>>> String token = credential.getAccessToken();
>>>>>>>>>>
>>>>>>>>>> System.out.println("Token "+token);
>>>>>>>>>>
>>>>>>>>>> String uri = "http://ZZZZZ.appspot.com/gcm/home";;
>>>>>>>>>>
>>>>>>>>>> System.out.println("uri: " + uri);
>>>>>>>>>>
>>>>>>>>>> HttpGet get = new HttpGet(uri);
>>>>>>>>>> get.setHeader("Cookie", token);
>>>>>>>>>>
>>>>>>>>>> HttpClient client = new DefaultHttpClient();
>>>>>>>>>> HttpResponse response = client.execute(get);
>>>>>>>>>> response.getEntity().writeTo(System.out);
>>>>>>>>>>
>>>>>>>>>> Typical output:
>>>>>>>>>>
>>>>>>>>>> Access token refresh true
>>>>>>>>>> Token ya29.xQGG1kxxxxxxxxxxxxxxxxxxx
>>>>>>>>>> uri: http://ZZZZZ.appspot.com/gcm/home
>>>>>>>>>>
>>>>>>>>>> <!DOCTYPE html>
>>>>>>>>>> <html lang="en">
>>>>>>>>>> <head>
>>>>>>>>>> <meta charset="utf-8">
>>>>>>>>>> <meta content="width=300, initial-scale=1" name="viewport">
>>>>>>>>>> <meta name="google-site-verification"
>>>>>>>>>> content="LrdTUW9psUAMbh4Ia074-BPEVmcpBxF6Gwf0MSgQXZs">
>>>>>>>>>> <title>Sign in - Google Accounts</title>
>>>>>>>>>> .....
>>>>>>>>>>
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