(C) Hotmail Refresh Access Token (also for Live.com, Outlook.com)

See more OAuth2 Examples

An OAuth2 access token is typically valid for 1 hour. Interaction with the Hotmail account owner via a browser is only needed for getting the initial access token. Once you have it, it can be continually refreshed without user interaction for a long time.

See: How Long can an OAuth2 Access Token be Refreshed?

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#include <C_CkJsonObject.h>
#include <C_CkOAuth2.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    BOOL success;
    HCkOAuth2 oauth2;
    HCkStringBuilder sbJson;

    // 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.

    // Note: Refreshing an access token does not require user-interaction.  
    // Only the act of getting the initial access token requires interactive authorization from the Hotmail account owner 
    // (i.e. a browser is displayed and the Hotmail account owner authorizes access by the app).

    // Once you have the initial access token, it can be refreshed for a long time.
    // A typical strategy is to write your application to automatically refresh the access token 
    // when authentication fails, and then retry the operation with the new access token.

    jsonToken = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/hotmail.json");
    if (success != TRUE) {
        printf("Failed to load office365.json\n");
        CkJsonObject_Dispose(jsonToken);
        return;
    }

    // The access token JSON looks like this:

    // {
    //   "token_type": "Bearer",
    //   "scope": "https://outlook.office.com/SMTP.Send https://outlook.office.com/IMAP.AccessAsUser.All https://outlook.office.com/POP.AccessAsUser.All",
    //   "expires_in": 3600,
    //   "ext_expires_in": 3600,
    //   "access_token": "EwBoA+ ... 7pOYcWr5pFwQgI=",
    //   "refresh_token": "M.C546_BL2.0.U.-CkW ... g5CKSlDBQ$$",
    //   "id_token": "eyJ0e ... 2iiu5iqBK9n7s3A"
    // }

    oauth2 = CkOAuth2_Create();

    // See Microsoft OAuth2 Authorization Endpoint
    CkOAuth2_putTokenEndpoint(oauth2,"https://login.microsoftonline.com/common/oauth2/v2.0/token");

    // Replace this with your actual App Registration's Application (client) ID.
    CkOAuth2_putClientId(oauth2,"CLIENT_ID");

    // Get the "refresh_token"
    CkOAuth2_putRefreshToken(oauth2,CkJsonObject_stringOf(jsonToken,"refresh_token"));

    // Send the HTTP POST to refresh the access token..
    success = CkOAuth2_RefreshAccessToken(oauth2);
    if (success != TRUE) {
        printf("%s\n",CkOAuth2_lastErrorText(oauth2));
        CkJsonObject_Dispose(jsonToken);
        CkOAuth2_Dispose(oauth2);
        return;
    }

    printf("%s\n",CkOAuth2_lastErrorText(oauth2));

    printf("New access token: %s\n",CkOAuth2_accessToken(oauth2));
    printf("New refresh token: %s\n",CkOAuth2_refreshToken(oauth2));

    // Update the JSON with the new tokens.
    CkJsonObject_UpdateString(jsonToken,"access_token",CkOAuth2_accessToken(oauth2));
    CkJsonObject_UpdateString(jsonToken,"refresh_token",CkOAuth2_refreshToken(oauth2));

    // Save the new JSON access token response to a file.
    sbJson = CkStringBuilder_Create();
    CkJsonObject_putEmitCompact(jsonToken,FALSE);
    CkJsonObject_EmitSb(jsonToken,sbJson);
    CkStringBuilder_WriteFile(sbJson,"qa_data/tokens/hotmail.json","utf-8",FALSE);

    printf("OAuth2 authorization granted!\n");
    printf("New Access Token = %s\n",CkOAuth2_accessToken(oauth2));


    CkJsonObject_Dispose(jsonToken);
    CkOAuth2_Dispose(oauth2);
    CkStringBuilder_Dispose(sbJson);

    }