Authenticate against Jira REST APIs with OAuth 1.0a 1-Legged and .NET Core 2.x

OAuth specification 2.0 is out there since 2012 but 1.0a version is still widely used. Atlassian’s Jira is for example such case. You wouldn’t find anything about 1-Legged OAuth in the documentation but the fact is, by now, Jira is still supporting this flow but referring to this wrongly as 2-Legged OAuth. Sadly there aren’t lot of .Net Core libraries which implements OAuth’s 1-Legged, as described in the The OAuth Bible. I implemented this functionality into oauth-dotnetcore and will show you how this can be used to access Jira APIs.