I need to retrieve some data through the gravity forms API (which is installed as a plugin in a WordPress server). I must implement OAuth 1.0. Some of the ruby gems available for this type of authentication don't work pretty well for me, so I decided to implement it myself.
I'm able to sign the base string if I don't add extra params but once I add them I get the error Invalid signature - provided signature does not match.
My code looks like this:
# This OAUTH implementation works without extra query params.
require 'httparty'
OAUTH_TOKEN = "API customer secret token"
OAUTH_PASSWORD = "API customer key token"
url = 'https://localhost/wp-json/gf/v2/entries'
params = "oauth_consumer_key=#{OAUTH_TOKEN}&oauth_nonce=#{SecureRandom.hex}&oauth_signature_method=HMAC-SHA1&oauth_timestamp=#{Time.now.to_i}&oauth_token=#{OAUTH_PASSWORD}&oauth_version=1.0"
base_string = 'GET&' + CGI.escape(url) + '&' + CGI.escape(params)
secret = "#{OAUTH_PASSWORD}&#{}"
oauth_signature = sign(secret, base_string)
testable_url = url + '?' + params + '&oauth_signature=' + oauth_signature
response = HTTParty.get(testable_url)
def sign( secret, base_string )
CGI.escape(Base64.encode64("#{OpenSSL::HMAC.digest('sha1', secret, base_string)}").chomp)
end
But once I add the query params I need, it crashes.
query_params = 'search={"field_filters":[{"key":"'+form['key']+'","value":"'+email+'","operator":"is"},{"key":"source_url","value":"'+form['source_url'].to_s+'","operator":"is"}]}'
I'm updating the base_string to include the query_params then I sign it again and I update the final url
base_string = 'GET&' + CGI.escape(url) + '&' + CGI.escape(query_params) + '&' + CGI.escape(params)
oauth_signature = sign(secret, base_string)
testable_url = url + '?' + query_params + '&' + params + '&oauth_signature=' + oauth_signature
As a result I get the following URL
"https://localhost/wp-json/gf/v2/entries?search={\"field_filters\":[{\"key\":\"2\",\"value\":\"some@email.com\",\"operator\":\"is\"},{\"key\":\"source_url\",\"value\":\"https://localhost/some_url_i_need/\",\"operator\":\"is\"}]}&oauth_consumer_key=APICUSTOMERSECRET&oauth_nonce=81a6ce4dcabd5ec1059f66ca7ae727e3&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1607594914&oauth_token=APICUSTOMER_TOKEN&oauth_version=1.0&oauth_signature=LIZpR27KNHsw3iWArJjSs%2FsvIek%3D"
Which doesn't work due to the Invalid signature - provided signature does not match. error.
As suggested in the documentation and other posts I've read (https://stackoverflow.com/a/4789210), I've sorted the params (basically I added search param I need at the end of the base string and that didn't solve my issue.
Note: It works in Postman, and the URL that Postman generates is pretty much like the one I get with Ruby.
