(Objective-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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#import <CkoJsonObject.h>
#import <CkoOAuth2.h>
#import <CkoStringBuilder.h>

// 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.

CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
BOOL success = [jsonToken LoadFile: @"qa_data/tokens/hotmail.json"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load office365.json");
    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"
// }

CkoOAuth2 *oauth2 = [[CkoOAuth2 alloc] init];

// See Microsoft OAuth2 Authorization Endpoint
oauth2.TokenEndpoint = @"https://login.microsoftonline.com/common/oauth2/v2.0/token";

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

// Get the "refresh_token"
oauth2.RefreshToken = [jsonToken StringOf: @"refresh_token"];

// Send the HTTP POST to refresh the access token..
success = [oauth2 RefreshAccessToken];
if (success != YES) {
    NSLog(@"%@",oauth2.LastErrorText);
    return;
}

NSLog(@"%@",oauth2.LastErrorText);

NSLog(@"%@%@",@"New access token: ",oauth2.AccessToken);
NSLog(@"%@%@",@"New refresh token: ",oauth2.RefreshToken);

// Update the JSON with the new tokens.
[jsonToken UpdateString: @"access_token" value: oauth2.AccessToken];
[jsonToken UpdateString: @"refresh_token" value: oauth2.RefreshToken];

// Save the new JSON access token response to a file.
CkoStringBuilder *sbJson = [[CkoStringBuilder alloc] init];
jsonToken.EmitCompact = NO;
[jsonToken EmitSb: sbJson];
[sbJson WriteFile: @"qa_data/tokens/hotmail.json" charset: @"utf-8" emitBom: NO];

NSLog(@"%@",@"OAuth2 authorization granted!");
NSLog(@"%@%@",@"New Access Token = ",oauth2.AccessToken);