(Lianja) Yahoo Mail Refresh OAuth2 Access Token

See more Yahoo Mail Examples

For more information, see https://developer.yahoo.com/oauth2/guide/

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

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file 
// saved by this example: Get Yahoo Mail OAuth2 Access Token

loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.LoadFile("qa_data/tokens/yahooMail.json")
if (llSuccess <> .T.) then
    ? "Failed to load googleSheets.json"
    release loJsonToken
    return
endif

// The access token JSON looks like this:

// {
//   "access_token": "kCVQdnOdul...LHucA--",
//   "refresh_token": "AIenVWETSo0jklFBVkPS8vVm8E.Dj9ToRG.xDbDYmZ55WIs5t6CZhDkD",
//   "expires_in": 3600,
//   "token_type": "bearer",
//   "xoauth_yahoo_guid": "HGDQCVF6JB4YDOWHITPJFBHCWA"
// }

loOauth2 = createobject("CkOAuth2")

// See Step 5 at https://developer.yahoo.com/oauth2/guide/flows_authcode/
loOauth2.TokenEndpoint = "https://api.login.yahoo.com/oauth2/get_token"

// Replace these with actual values.
loOauth2.ClientId = "CLIENT_ID"
loOauth2.ClientSecret = "CLIENT_SECRET"

// Get the "refresh_token"
loOauth2.RefreshToken = loJsonToken.StringOf("refresh_token")

// Send the HTTP POST to refresh the access token..
llSuccess = loOauth2.RefreshAccessToken()
if (llSuccess <> .T.) then
    ? loOauth2.LastErrorText
    release loJsonToken
    release loOauth2
    return
endif

// The response contains a new access token, but we must keep
// our existing refresh token for when we need to refresh again in the future.
loJsonToken.UpdateString("access_token",loOauth2.AccessToken)

// Save the new JSON access token response to a file.
loSbJson = createobject("CkStringBuilder")
loJsonToken.EmitCompact = .F.
loJsonToken.EmitSb(loSbJson)
loSbJson.WriteFile("qa_data/tokens/yahooMail.json","utf-8",.F.)

? "OAuth2 authorization granted!"
? "New Access Token = " + loOauth2.AccessToken


release loJsonToken
release loOauth2
release loSbJson