linkedin-oauth

LinkedIn OAuth Implementation

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#### Register two endpoints

- First for hitting the Linkedin API which enforces the user to login in the Linkedin and get the temporary access code.
- Second for the callback url, which should uses the temporary code to get the access token and the user profile, using it either we can authenticate in the application server.

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``
app.get("/linkedin", (req, res) => {
const redirectUri = linkedInOAuth.getAuthorizationUrl();
return res.redirect(redirectUri);
});
`

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`
app.get("/linkedin/callback", async (req: Request, res: Response) => {
const code = req.query.code as string;

if (!code) {
console.error("No linkedin code available.");
return res.redirect(${LINKEDIN_FAILURE_CALLBACK_URI}?success=false);
}

try {
//retrieving access token to get the user profile...
const linkedInAccessToken = await linkedInOAuth.getAccessToken(code);

// Getting user profile
const linkedInProfile = await linkedInOAuth.getUserProfile(
linkedInAccessToken.access_token,
);

// Alternatively use ID token.
const userProfileFromIdToken = linkedInOAuth.getUserProfileFromIdToken(linkedInAccessToken.id_token);

// Use the linkedin profile to either register or signup or create a seperate endpoint to handle each register/login
const applicationAccessToken =
mockApplication.loginOrSignUp(linkedInProfile);

return res.redirect(
${LINKEDIN_SUCCESS_CALLBACK_URI}?success=true&accessToken=${applicationAccessToken},
);
} catch (err) {
console.error(err);
if (err instanceof LinkedInOAuthException) {
return res.redirect(${LINKEDIN_FAILURE_CALLBACK_URI}?success=false);
}
}
});
``

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