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macOS: Improve HTML page when authorization completes in the browser #633

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macOS: Improve HTML page when authorization completes in the browser #633

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36babe0
Show a better looking HTML page in macOS
roop Apr 29, 2021
69304aa
Fix warning on formatting NSInteger
roop Apr 30, 2021
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122 changes: 95 additions & 27 deletions Source/AppAuth/macOS/OIDRedirectHTTPHandler.m
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Original file line number Diff line number Diff line change
Expand Up @@ -27,29 +27,84 @@
#import "OIDExternalUserAgentSession.h"
#import "OIDLoopbackHTTPServer.h"

/*! @brief Page that is returned following a completed authorization. Show your own page instead by
supplying a URL in @c initWithSuccessURL that the user will be redirected to.
/*! @brief Template for page that is returned following a completed authorization or authorization error.
Show your own success page instead by supplying a URL in @c initWithSuccessURL that
the user will be redirected to.
*/
static NSString *const kHTMLAuthorizationComplete =
@"<html><body>Authorization complete.<br> Return to the app.</body></html>";

/*! @brief Error warning that the @c currentAuthorizationFlow is not set on this object (likely a
static NSString *const kHTMLPageTemplate = @""
"<!DOCTYPE html>"
"<html lang=\"en\" dir=\"ltr\" xmlns=\"http://www.w3.org/1999/xhtml\">"
"<head>"
" <meta charset=\"utf-8\" />"
" <title>%@</title>"
" <style>"
"body {"
" font-family: -apple-system, BlinkMacSystemFont, \"Avenir Next\", Avenir,"
" \"Nimbus Sans L\", Roboto, Noto, \"Segoe UI\", Arial,"
" Helvetica, \"Helvetica Neue\", sans-serif;"
" margin: 0;"
" height: 100vh;"
" display: flex;"
" align-items: center;"
" justify-content: center;"
" background: #ccc;"
" color: #888;"
"}"
"main {"
" padding: 1em 2em;"
" text-align: center;"
" border: 1pt solid #666;"
" box-shadow: rgba(0, 0, 0, 0.2) 0px 1px 4px;"
" border-color: #aaa;"
" background: #ddd;"
"}"
" </style>"
"</head>"
"<body class=\"finished\">"
" <main>"
" <h2>%@</h2>"
" <p>%@</p>"
" </main>"
"</body>"
"</html>";

/*! @brief Title, heading and message for HTML success page that is shown following a completed authorization.
Show your own page instead by supplying a URL in @c initWithSuccessURL that
the user will be redirected to.
*/
static NSString *const kStringsAuthorizationComplete[] =
{
@"Authorization Successful",
@"The client authorized succesfully",
@"You can now close this tab."
};

/*! @brief Title, heading and message for HTML error page warning that the
@c currentAuthorizationFlow is not set on this object (likely a
developer error, unless the user stumbled upon the loopback server before the authorization
had started completely).
@description An object conforming to @c OIDExternalUserAgentSession is returned when the
@description An object conforming to @c OIDExternalUserAgentSession is returned when the
authorization is presented with
@c OIDAuthorizationService::presentAuthorizationRequest:callback:. It should be set to
@c currentAuthorization when using a loopback redirect.
*/
static NSString *const kHTMLErrorMissingCurrentAuthorizationFlow =
@"<html><body>AppAuth Error: No <code>currentAuthorizationFlow</code> is set on the "
"<code>OIDRedirectHTTPHandler</code>. Cannot process redirect.</body></html>";

/*! @brief Error warning that the URL does not represent a valid redirect. This should be rare, may
happen if the user stumbles upon the loopback server randomly.
static NSString *const kStringsErrorMissingCurrentAuthorizationFlow[] =
{
@"Authorization Error",
@"Authorization Error",
@"AppAuth Error: No <code>currentAuthorizationFlow</code> is set on the "
"<code>OIDRedirectHTTPHandler</code>. Cannot process redirect."
};

/*! @brief Title, heading and message for HTML error page warning that the URL does not represent a
valid redirect. This should be rare, may happen if the user stumbles upon the loopback server randomly.
*/
static NSString *const kHTMLErrorRedirectNotValid =
@"<html><body>AppAuth Error: Not a valid redirect.</body></html>";
static NSString *const kStringsErrorRedirectNotValid[] =
{
@"Authorization Error",
@"Authorization Error",
@"AppAuth Error: Not a valid redirect."
};

@implementation OIDRedirectHTTPHandler {
HTTPServer *_httpServ;
Expand Down Expand Up @@ -134,19 +189,32 @@ - (void)HTTPConnection:(HTTPConnection *)conn didReceiveRequest:(HTTPServerReque
[self stopHTTPListener];
}

// Responds to browser request.
NSString *bodyText = kHTMLAuthorizationComplete;
NSInteger httpResponseCode = (_successURL) ? 302 : 200;
// Returns an error page if a URL other than the expected redirect is requested.
if (!handled) {
if (_currentAuthorizationFlow) {
bodyText = kHTMLErrorRedirectNotValid;
httpResponseCode = 404;
} else {
bodyText = kHTMLErrorMissingCurrentAuthorizationFlow;
httpResponseCode = 400;
}
NSString *bodyText = @"";
NSInteger httpResponseCode = 0;

if (handled) {
bodyText = [NSString stringWithFormat:kHTMLPageTemplate,
kStringsAuthorizationComplete[0],
kStringsAuthorizationComplete[1],
kStringsAuthorizationComplete[2]];
httpResponseCode = (_successURL) ? 302 : 200;
} else if (_currentAuthorizationFlow) {
bodyText = [NSString stringWithFormat:kHTMLPageTemplate,
kStringsErrorMissingCurrentAuthorizationFlow[0],
kStringsErrorMissingCurrentAuthorizationFlow[1],
kStringsErrorMissingCurrentAuthorizationFlow[2]];
httpResponseCode = 404;
} else {
bodyText = [NSString stringWithFormat:kHTMLPageTemplate,
kStringsErrorRedirectNotValid[0],
kStringsErrorRedirectNotValid[1],
kStringsErrorRedirectNotValid[2]];
httpResponseCode = 400;
}

NSAssert([bodyText length] > 0, @"bodyText is empty");
NSAssert(httpResponseCode > 0, @"httpResponseCode is %ld, should be greater than 0", (long) httpResponseCode);

NSData *data = [bodyText dataUsingEncoding:NSUTF8StringEncoding];

CFHTTPMessageRef response = CFHTTPMessageCreateResponse(kCFAllocatorDefault,
Expand Down