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PureBasic Web API Examples

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(PureBasic) ETrade OAuth1 Authorization (3-legged) Step 2

Demonstrates the final step in 3-legged OAuth1 authorization for the ETrade REST API. Example uses the OAuth1 verifier code that was copy-and-pasted from the browser in the 1st step. The end result of this final OAuth1 step is an access token that can be used to make ETrade REST API calls.

See https://apisb.etrade.com/docs/api/authorization/get_access_token.html

Chilkat PureBasic Module Download

Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkFileAccess.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkHashtable.pb"

Procedure ChilkatExample()

    ; This requires the Chilkat API to have been previously unlocked.
    ; See Global Unlock Sample for sample code.

    consumerKey.s = "ETRADE_CONSUMER_KEY"
    consumerSecret.s = "ETRADE_CONSUMER_SECRET"

    requestTokenUrl.s = "https://apisb.etrade.com/oauth/request_token"
    authorizeUrl.s = "https://us.etrade.com/e/t/etws/authorize"
    accessTokenUrl.s = "https://apisb.etrade.com/oauth/access_token"

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i = 1

    CkHttp::setCkOAuth1(http, 1)
    CkHttp::setCkOAuthConsumerKey(http, consumerKey)
    CkHttp::setCkOAuthConsumerSecret(http, consumerSecret)
    CkHttp::setCkOAuthCallback(http, "oob")

    jsonRequestToken.i = CkJsonObject::ckCreate()
    If jsonRequestToken.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkJsonObject::ckLoadFile(jsonRequestToken,"qa_data/tokens/etrade_request_token.json")
    requestToken.s = CkJsonObject::ckStringOf(jsonRequestToken,"oauth_token")
    requestTokenSecret.s = CkJsonObject::ckStringOf(jsonRequestToken,"oauth_token_secret")

    ; ------------------------------------------------------------------------------
    ; Exchange the OAuth Request Token for an OAuth Access Token.

    CkHttp::setCkOAuthToken(http, requestToken)
    CkHttp::setCkOAuthTokenSecret(http, requestTokenSecret)

    ; This is the verifier that was interactively copy-and-pasted from the browser back to our app.
    CkHttp::setCkOAuthVerifier(http, "NJ07S")

    resp.i = CkHttp::ckQuickGetObj(http,accessTokenUrl)
    If CkHttp::ckLastMethodSuccess(http) <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkJsonObject::ckDispose(jsonRequestToken)
        ProcedureReturn
    EndIf

    ; Make sure a successful response was received.
    If CkHttpResponse::ckStatusCode(resp) <> 200
        Debug CkHttpResponse::ckStatusLine(resp)
        Debug CkHttpResponse::ckHeader(resp)
        Debug CkHttpResponse::ckBodyStr(resp)
        CkHttp::ckDispose(http)
        CkJsonObject::ckDispose(jsonRequestToken)
        ProcedureReturn
    EndIf

    ; If successful, the resp.BodyStr contains something like this:
    ; oauth_token=85123455-fF41296Bi3daM8eCo9Y5vZabcdxXpRv864plYPOjr&oauth_token_secret=afiYJOgabcdSfGae7BDvJVVTwys8fUGpra5guZxbmFBZo
    Debug CkHttpResponse::ckBodyStr(resp)

    hashTab.i = CkHashtable::ckCreate()
    If hashTab.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHashtable::ckAddQueryParams(hashTab,CkHttpResponse::ckBodyStr(resp))

    accessToken.s = CkHashtable::ckLookupStr(hashTab,"oauth_token")
    accessTokenSecret.s = CkHashtable::ckLookupStr(hashTab,"oauth_token_secret")

    CkHttpResponse::ckDispose(resp)

    ; The access token + secret is what should be saved and used for
    ; subsequent REST API calls.
    Debug "Access Token = " + accessToken
    Debug "Access Token Secret = " + accessTokenSecret

    ; Save this access token for future calls.
    ; Just in case we need user_id and screen_name, save those also..
    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckAppendString(json,"oauth_token",accessToken)
    CkJsonObject::ckAppendString(json,"oauth_token_secret",accessTokenSecret)

    fac.i = CkFileAccess::ckCreate()
    If fac.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkFileAccess::ckWriteEntireTextFile(fac,"qa_data/tokens/etrade.json",CkJsonObject::ckEmit(json),"utf-8",0)

    Debug "Success."


    CkHttp::ckDispose(http)
    CkJsonObject::ckDispose(jsonRequestToken)
    CkHashtable::ckDispose(hashTab)
    CkJsonObject::ckDispose(json)
    CkFileAccess::ckDispose(fac)


    ProcedureReturn
EndProcedure

 

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