Invalid signature Open Bank Project Oauth1.0a - react-native

Question

I'm developing a React-Native App with Open Bank Project and I can't use suggested SDKs, not even the nodeJS one as Oauth1.0 is not available in RN.
And I'm stuck with a Bad Signature error on Access Token request '/oauth/token' after passed '/oauth/initiate' and '/oauth/authorize' without any problem.
As specified in docs here before accessing to a Protected Resource we need an Access Token via a POST Request, which gives me the Bad Signature answer.
Here is my code for the request:
getAccessToken(verifier){
let request = {
url: 'https://api.openbankproject.com/oauth/token',
method: 'POST',
data: {
oauth_verifier: verifier,
oauth_token: this.auth.oauth_token,
oauth_token_secret: this.auth.oauth_token_secret
}
}
return fetch(this.url_login, {
method: request.method, //POST
form: request.data,
headers: this.oauth.toHeader(this.oauth.authorize(request))
})
.then((res) => {return res.text()})
.then((txt) => {
console.log('setUID', txt, this.url_login, {
method: request.method,
form: request.data,
headers: this.oauth.toHeader(this.oauth.authorize(request))
})
})
Here is the signed request:
Object {method: "POST", form: Object, headers: Object}
form:
oauth_token:"..."
oauth_token_secret:"..."
oauth_verifier:"71531"
headers:
Authorization:
"OAuth oauth_consumer_key="...", oauth_nonce="3UlQ5dx958tibf6lSg0RUGPQFZeV7b8V", oauth_signature="weyE1lFkoIjAErYLKdSi9SDlCZsNBi7%2BuAkLV2PWePo%3D", oauth_signature_method="HMAC-SHA256", oauth_timestamp="1464248944", oauth_token="...", oauth_token_secret="...", oauth_verifier="71531", oauth_version="1.0""
I've tried with and without Oauth_token_secret, also moving oauth_verifier from body to query but with the same Bad Signature result.
Any idea? thx

Answer 1

You can use oauth module https://github.com/ciaranj/node-oauth
var oauth=require('oauth');
var consumer = new oauth.OAuth(
"https://twitter.com/oauth/request_token", "https://twitter.com/oauth/access_token",
_twitterConsumerKey, _twitterConsumerSecret, "1.0A", "http://127.0.0.1:8080/sessions/callback", "HMAC-SHA1");
then generating signature like this :
var parameters = consumer._prepareParameters("user_access_token", "user_access_token_secret", "http_method", "request_url");
var headers = consumer._buildAuthorizationHeaders(parameters);
parameters array contains signature, also you can build authorization headers if needed. Hope it helps :)