I'm developing a ethereum dapp that can automatically generate new accounts (wallet addresses) for users immediately after a registration button is clicked.
It's pretty complicated for me since I'm a newbie in dapp development. Any solution on how to achieve this will highly be appreciated. I also have a Php script downloaded from GitHub link though it could be handy for account generation since I'm using PHP as a back-end but still confused on how to use the script.
Requesting help on using the ethereum-PHP script for account generation will also be appreciated. Thanks
Your question is quite broad, but you should be able to do what you wish by using either Geth or Parity. Personally, I prefer Parity. They have good documentation and their API is easy to use.
Parity.io
If youre using web3 in front end you could simply use web3.eth.accounts.create(<key>); and save it on front end.
If youre using Metamask it has their own way of handling account creation out of the box.
You could use the personal.newAccount() in php-ethereum but in that case youre generating the private key at the server end which could be a possible.
you need to use web3 for this task. In your sigup/register function file import web3 and connect it with you network. after that you can call two methods of web3 library.
one is web3.eth.personal.newAccount('password'): this function will generate account with keystore file . keystore file will be stored on network file directory.
second one is web3.eth.accounts.create(): this method will generate new account with private key of account which you can use to perform task on network .
Related
I have the following lines of python code
import os
def hello_world():
r=os.system("curl ipinfo.io/ip")
print (r)
hello_world()
Shows the desired output when executed from command line in Google Cloud Shell but seems there is a 0 at the end of IP Address output
$ python3 main2.py
34.X.X.2490
When I deployed the same code in Google CLoud function it is showing OK as output
I have to replace the first line of code in GCF as follows to make it deploy.
def hello_world(self):
Any suggestion so that GCF displays the desired output which is the output of curl command?
Your function won't work for 2 reasons:
Firstly, you don't respect the HTTP Cloud Function Python function signature:
def hello_world(request):
....
Secondly, you can't use system call. In fact not exactly, you can perform system call, but, because you don't know which package/binaries are installed, you can't rely on this. It's serverless, you don't manage the underlying infrastructure and runtime environment.
Here you made the assumption that CURL is installed on the runtime image. Maybe yes, maybe not, maybe it was, maybe it will be remove in future!! You can't rely on that!!
If you want to manage you runtime environment, you can use Cloud Run. You will manage your runtime environment, and you can install what you want on it and then you are sure of what you can do.
Last remarks:
note: instead of performing a CURL, you can perform a http get request to the same URL to get the IP
Why do you want to know the outgoing IP? It's serverless, you also don't manage the network. You will reach the internet through a Google IPs. It can change everytime, and other cloud functions (or cloud run), from your projects or project from others (like me), are able to use the same IPs. It's Google IPs, not yours! If it's your requirement, let me know, there are solutions for that!
I am currently using 1.24.x and using LoginForm class and FauxRequest to login the remote (and create it locally if it doesn't exist) but this feature is being removed in 1.27.x so I am forced to write with a new standard using AuthManager and SessionMamager. I also will be upgrading to 1.31 as soon as LTS version of it comes out.
While reading, AuthManager and SessionManager, I just can't understand how can I authenticate external users. I also looked at the extension pluggableSSO which uses PluggableAuth but can't understand it as well.
Can someone please point me to a straightforward example of how can I authenticate a user if I have a user id and user name? and if that user doesn't exist, how can I create one and authenticate them locally?
Thanks
If someone like me who is very new to MediaWiki, there is a solution for SSO called PluggableAuth and Auth_Remoteuser.
I picked PluggableAuth which is implemented based on AuthManager and it is very easy to integrate.
All we need is to define a global variable $PluggableAuth_Class and implement the following methods in it:
public function authenticate( &$id, &$username, &$realname, &$email, &$errorMessage )
public function saveExtraAttributes( $id )
public function deauthenticate( User &$user )
More information can be found on:
PluggableAuth
I need to install a xades library in a web-application, this webapp will produce xades documents using remote-sign certificates.
The private key of this certificates are placed on a remote HSM device, so if i have to sign (i mean produce a RSA of a digest) i need to pass the hash to the remote device, this will produce the rsa and will give it to the webapp that with xades4j will create the xades structure
Can you tell me if xades4j already can do this, and if not how can i implement a sort of signatureProvider for xades4j that delegate the production of the RSA to a remote device?
Thanks
Old-but-gold question: I'm stucking at the same point too, but... I found a different (maybe cleaner) way to get the result, so that's my suggestion:
Implement a Provider (https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#Provider)` with it's own "SHA256WithRSA" algorithm implementation, that delegates the signature production to something out of the application
Pass this Provider to the sign() method
I don't know if this can work, but it seems like a nicer try...
I am trying to fetch the contacts of the user who have an account in google apps marketplace. While fetching the contact i get the following error
com.google.gdata.util.ParseException: The prefix "atom" for element "atom:cc" is not bound.
at com.google.gdata.util.XmlParser.parse(XmlParser.java:695)|
at com.google.gdata.util.XmlParser.parse(XmlParser.java:568)|
at com.google.gdata.data.BaseFeed.parseAtom(BaseFeed.java:793)|
at com.google.gdata.wireformats.input.AtomDataParser.parse(AtomDataParser.java:68)|
at com.google.gdata.wireformats.input.AtomDataParser.parse(AtomDataParser.java:39)|
at com.google.gdata.wireformats.input.CharacterParser.parse(CharacterParser.java:)|
at com.google.gdata.wireformats.input.XmlInputParser.parse(XmlInputParser.java:52)|...
I am using Java client library to fetch the contacts. Can you please let me know is there an issue in the java client library? This issue is there for a long time and I badly need to find a solution for this...What should I do to make it work...Any help will be grateful..
Thanks,
VijayRaj
I got the same Problem, that you have with the Java Client, with the .NET client.
After contacting Google support, they told me that the Contacts arbitrary XML data which is in an Property element cannot be parsed within my version of GData .
However, there is a time intensive workaround, by deleting and recreating Contacts, but thats probably not what you are looking for, me either.
After switching to the Python implementation all works fine now.
Check out this Issue report Issue 361
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.