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msc {
# Use https://mscgen.js.org or mscgen to convert this into PNG
hscale="1.5",
wordwraparcs=on;
user [ label="User", textbgcolor="blue", textcolor="white" ],
mattermost [ label="Mattermost", textbgcolor="red", textcolor="white"],
gitlab [ label="GitLab", textbgcolor="indigo", textcolor="white"];
user=>mattermost [label="GET https://mm.domain.com"];
mattermost note gitlab [label="Obtain access code", textcolor="green"];
mattermost=>gitlab [label="GET https://gitlab.domain.com/oauth/authorize", textcolor="indigo"];
gitlab rbox user [label="GitLab user logs in (if necessary)"];
gitlab rbox gitlab [label="GitLab verifies client_id matches an OAuth application"];
gitlab=>user [label="GitLab asks user to authorize Mattermost OAuth app"];
user=>gitlab [label="User clicks 'Allow'"];
gitlab rbox gitlab [label="GitLab verifies redirect_uri matches list of valid URLs"];
gitlab=>user [label="302 Redirect: https://mm.domain.com/signup/gitlab/complete"];
user=>mattermost [label="GET https://mm.domain.com/signup/gitlab/complete", textcolor="red"];
mattermost note gitlab [label="Exchange access code for access token", textcolor="green"];
mattermost=>gitlab [label="POST http://gitlab.domain.com/oauth/token", textcolor="indigo"];
gitlab=>gitlab [label="Doorkeeper::TokensController#create"];
gitlab=>mattermost [label="Access token", textcolor="red"];
mattermost note gitlab [label="Mattermost looks up GitLab user", textcolor="green"];
mattermost=>gitlab [label="GET https://gitlab.domain.com/api/v4/user", textcolor="indigo"];
gitlab=>mattermost [label="User details", textcolor="red"];
mattermost=>user [label="Mattermost/GitLab user ready"];
}
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