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This is a Golang library for fetching the name and commercial activities of a Chilean citizen using their RUT (Rol Único Tributario) from the Servicio de Impuestos Internos (SII) of Chile.

Use the go get command to install the library:

go get github.com/Eitol/gosii

// Print the name of a person given their RUTpackage mainimport ("fmt""github.com/Eitol/gosii""strconv")funcmain() {rutExample:="5.126.663-3"// RUT de Sebastian PiñerassiClient:=gosii.NewClient()citizen,err:=ssiClient.GetNameByRUT(rutExample)iferr!=nil {panic(err)    }fmt.Println(citizen.Name)// Output: MIGUEL JUAN SEBASTIAN PINERA ECHENIQUEfmt.Print(citizen.Activities[0])// Output: 829900// Note: "829900" is the code of "OTRAS ACTIVIDADES DE SERVICIOS DE APOYO A LAS EMPRESAS N.C.P"}

The library works by making HTTP requests to the SII's web services and parsing the responses. The flow can be summarized in the following steps:

1- Fetch a captcha challenge from SII's service (necessary for making requests).

2- Send a POST request to SII's service with the provided RUT and the fetched captcha.

3- Parse the HTML response to extract the citizen's name and associated commercial activities.

A crucial step in this process is fetching and solving the captcha challenge.

To solve the captcha, the library decodes a base64 encoded string provided by SII's service, which includes the captcha solution.

echo | openssl s_client -servername zeus.sii.cl -connect zeus.sii.cl:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > zeus_sii.pem

The Software is provided for academic purposes only. Commercial use is not permitted.